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  • 1.
    Ahmady, Tobias
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Klein Rosmar, Sander
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Translation of keywords between English and Swedish2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this project, we have investigated how to perform rule-based machine translation of sets of keywords between two languages. The goal was to translate an input set, which contains one or more keywords in a source language, to a corresponding set of keywords, with the same number of elements, in the target language. However, some words in the source language may have several senses and may be translated to several, or no, words in the target language. If ambiguous translations occur, the best translation of the keyword should be chosen with respect to the context. In traditional machine translation, a word's context is determined by a phrase or sentences where the word occurs. In this project, the set of keywords represents the context.

    By investigating traditional approaches to machine translation (MT), we designed and described models for the specific purpose of keyword- translation. We have proposed a solution, based on direct translation for translating keywords between English and Swedish. In the proposed solu- tion, we also introduced a simple graph-based model for solving ambigu- ous translations. 

  • 2.
    Ahmed, Olfet
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Saman, Nawar
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Utvärdering av nätverkssäkerheten på J Bil AB2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this project is to evaluate the network security at J Bil AB. The focus will be on both social and technical issues. For the employees to be able to con-nect to remote servers and external services and perform their daily work tasks, secure connections is needed. J Bil Ab has no IT manager who actively maintains and monitors the network; rather they consult a computer company when changes and implementations are required. The projects’ goal is to identify gaps, come up with suggestions for improvement and to some extent implement so-lutions. To do this, an observation of the employees hav been made, an inter-view have been held, and several attacks on the network have been performed. Based on the data collected, it was concluded that the company has shortcom-ings in IT security. Above all, the social security appeared to have major gaps in it and that is mainly because the lack of knowledge among the employees and they have never been informed of how to manage their passwords, computers and IT issues in general. Suggestions for improvement have been given and some implementations have been performed to eliminate the deficiencies.

  • 3.
    Ahmed, Tanvir Saif
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Markovic, Bratislav
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Distribuerade datalagringssystem för tjänsteleverantörer: Undersökning av olika användningsfall för distribuerade datalagringssystem2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this thesis, a study of three different uses cases has been made within the field of data storage, which are as following: Cold Storage, High Performance Storage and Virtual Machine Storage. The purpose of the survey is to give an overview of commercial distributed file systems and a deeper study of open source codes distributed file systems in order to find the most optimal solution for these use cases. Within the study, previous works concerning performance, data protection and costs were an-alyzed and compared in means to find different functionalities (snapshotting, multi-tenancy, data duplication and data replication) which distinguish modern distributed file systems. Both commercial and open distributed file systems were examined. A cost estimation for commercial and open distrib-uted file systems were made in means to find out the profitability for these two types of distributed file systems.After comparing and analyzing previous works, it was clear that the open source distributed file sys-tem Ceph was proper as a solution in accordance to the objectives that were set for High Performance Storage and Virtual Machine Storage. The cost estimation showed that it was more profitable to im-plement an open distributed file system. This study can be used as guidance to choose between different distributed file systems.

  • 4.
    Alameddine, Raged
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Dashtbozorg, Sajad
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utredning av för- och nackdelar med TN-S respektive TN-C system2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this report analysis the advantages and disadvantages of the TN-C (four conductor system) and TN-S (five conductor system) system. There are different opinion about which system is most appropriate to use in the distribution network and the building main lines. With the help of literature studies and contacts with various power companies and electric companies different opinion have been discussed . TN-C is the most appropriate option in the distribution network and TN-S should be used in the building main lines. This for achieving high and stable electrical environment. This thesis will facilitate the choice of technology and hopefully increase the knowledge about the subject.

  • 5.
    Al-Battat, Ahmed
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Anwer, Noora
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utvärdering utifrån ett mjukvaruutveckling perspektiv av ramverk för SharePoint2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The functionality was tested by two different tests, which showed that the product is suitable for usage in the intranet within a company or an organization, there are great benefits from using intranet as a tool for sharing of information. A good intranet contributes to a better flow of information and effective cooperation. SharePoint is a platform for intranet with interactive features, it makes the job easier for staff and even the company. The framework Omnia is a solution designed for Microsoft SharePoint 2013.This essay evaluates how Omnia acts as a framework and what the product is suitable for. Omnia framework evaluates carefully and is an independent assessment carried during this essay. The evaluation is based on scientific studies which are based on the qualitative and quantitative research methodology. The evaluator's main areas are based on system performance, scalability, architecture and functionality. A test prototype develops during the process in the form of an employee vacation request application by the development framework Omnia.The framework Omnia is considered to be suitable for the development of interactive web-based applications for SharePoint. The architecture for the system meets the requirements for scalable systems because it is based on the tier architecture. The system also has good performance but it needs to be improved if the number of users exceeds one thousand. The functionality of this product is quite suitable for the system's usage.

  • 6.
    Al-Breihi, Mohammed
    KTH, School of Technology and Health (STH).
    Utveckling av laboration om trefastransformatorn: En studie om transformatorer2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This degree project was carried out on behalf of the unit for Computer

    and Electrical engineering at the School of Technology and Health, KTH.

    This study about transformers, their function and uses, the way they’re

    built, how the core and windings, which are the most important parts of a

    transformer, are made and what kind of materials are used to make them.

    Several types of transformers and their functions are described. A crucial

    part of the study has been to search for different ways to develop

    transformers to make them environmentally safer and to increase their

    life-span. As such this work describes different transformer oils, what

    advantages and disadvantages they have compared to mineral oils, what

    properties they have and in what way they’re less harmful for the

    environment. HVDC units transform high voltages from Alternating

    Current to Direct Current to lessen the resistive losses and energy losses

    which lead to a cleaner environment.

    The theory examination of the transformer is the basis for the formation

    of a lab for educational use, among others in a course about electrical

    power that’s included in Bachelor of Science in Electrical Engineering at

    KTH.

  • 7.
    Andersson, Dan
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Implementation av prototyp för inomhuspositionering2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Development of technology constantly creates new opportunities but it can also mean major chang-es for companies and organizations. Today phones, tablets, laptops, mobile communications and cloud technology make it possible to be no longer bound by the time, location or device in order to work. The change means that a new office type that is more flexible and space efficient due to no fixed workplaces, is becoming more common. A problem with this type of offices that are known as flex-offices is that it is not obvious where or when a colleague is in the office, especially if it is large office with multiple floors.

    The aim of this work is to develop and implement a Location-Based Service for the company Connecta AB. The service will enable users to use their mobile phone to share their current workplace location in an office environment.

    The result of this work is a Location-Based Service that enables a user to use an Android phone with support for Near Field Communcication to share their current workplace position. The cloud-based server solution, Windows Azure is used to store indexed workplace positions.

  • 8.
    Andersson, Marcus
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Implementation av en metod för prestandamätning av sensorkommunikation med Bluetooth low energy2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet of Things develops and grows constantly. It becomes increasingly common that applications and units are connected through a network. One of the technologies used for wirelessly linking together units is Bluetooth Low Energy. Preferences for the quality of a connection can vary. It is therefore important to conduct measurements of performance in order to know advantages and disadvantages that a networking technology has. 

    This thesis is about measurements of performance during data transfers between mobile devices and wireless sensors, as well as monitoring parameters that are given during the measurements. One method using monitoring packets inspired from previously made research, were designed and implemented in a system for Bluetooth Low Energy, which was then evaluated.

    The result was that two systems were created that presented data loss, delay variation and throughput, continuously on a mobile device. One system used the method with monitoring packets. The other system used a self-made method which made measurements with high precision, but that places higher demands on functions and performance of the sensor node, and on the mobile device. Experiments were conducted by using the systems and resulting values were analyzed.

  • 9.
    Aodah, Anwar
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Öcüt, Bora
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Agilt regressionssystemtest2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete utfördes på avdelningsnivån CCS på avdelningen PDU Platforms på Ericsson. Avdelningen ville förändra sin nuvarande arbetsprocess genom att övergå från Daily Build, att bygga och testa en gång om dagen, till ett mer kontinuerligt byggande och testande. CCS hanterar och tillhandahåller kontrollsystemtjänster för RNC applikationer och äldre RBS.

     

    Målet med detta examensarbete var att automatisera testprocesser för att kunna utföra kontinuerliga tester. Första steget i arbetet var att ta fram ett specifikt användningsfall, ett use case, att arbeta mot. Detta skedde genom analys av felrapporter och detta ledde till att nodomstarter definierades som ett första användningsfall. När användningsfallet var definierat, skedde analys av plattform att använda för automatisering, samt vilka steg som behövde automatiseras. De var enligt följande, uppladdning med ftp, exekvering av filer med Telnet och nodkonfiguration med verktyget Cicc.

  • 10.
    Araya, Cristian
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Singh, Manjinder
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Web API protocol and security analysis2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is problem that every company has its own customer portal. This problem can be solved by creating a platform that gathers all customers’ portals in one place. For such platform, it is required a web API protocol that is fast, secure and has capacity for many users. Consequently, a survey of various web API protocols has been made by testing their performance and security.

    The task was to find out which web API protocol offered high security as well as high performance in terms of response time both at low and high load. This included an investigation of previous work to find out if certain protocols could be ruled out. During the work, the platform’s backend was also developed, which needed to implement chosen web API protocols that would later be tested. The performed tests measured the APIs’ connection time and their response time with and without load. The results were analyzed and showed that the protocols had both pros and cons. Finally, a protocol was chosen that was suitable for the platform because it offered high security and fast connection. In addition, the server was not affected negatively by the number of connections. Reactive REST was the web API protocol chosen for this platform.

  • 11.
    Bandali, Benjamin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Availability and perceived availability with interaction design: Cost-effective availability model for a multinational company2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Techniques of measuring web-service uptime have always been a key metric to improve interaction and system integration. Availability is a usual metric in the field of statistics where the goal is to attract customers, but perhaps more importantly the users and providers which can improve the services through this metric. Since availability differs a lot depending on type of service, company and usage, a common problem is to define what availability really is.

    The thesis will give the readers an introduction to availability, and also explain the reasons why it may vary, which is the theory of interaction design behind a service. Though availability is a metric that can be calculated through many different ways, the result is very complex to understand for the public that is interested in it.

    The goal of this thesis is to give the readers an understanding and guidelines of how to define perceived availability based on the system availability, but also present a method of defining, calculating and present the metric in a user-friendly procedure. The result will in turn consist of a cost-effective model for perceived availability and be tested at a multinational company.

  • 12.
    Bergqvist, Timmy
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Solenergi med energieffektiva byggnader och kostnadseffektiv lagring2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    När en investering ska göras är priset en prioriterad faktor att ta hänsyn till. Att investera i ett solcellssystem kostar mycket pengar som på längre sikt kommer resultera i en större intäkt än kostnad. När detta inträffar skiljer sig markant i många fall och med regeringens krångliga regler blir det inte lättare. Examensarbetet innefattar flera analyserande lösnings-metoder för plusenergikontoret i Väla Gård, Helsingborg. Anledningen är att kostnadseffektivisera solcellssystemet så att intresset för solproduk-tionen ökar i Sverige.Tre olika kostnadsmässiga scenarier med timdebitering, egenlagring och nettodebitering jämförs och presenteras grundat på beräkningsmetod inom aktuell forskning. Det bäst lämpade scenarierna ges i form av ett önskat införande för optimal vinst för kund och miljö.Energimarknaden kan snabbt äventyras vilket gör att valet av lämplig lösning minskar solcellsägarens riskfaktor och förhoppningsvis ökar sol-energiproduktionen.

  • 13.
    Björklund, Johan
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Prestandautvärdering av permanentmagnetmotor2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project was to evaluate a synchronous three-phase permanent magnet motor with brushless outrunner. It is supposed to be a part of an electric drive system for equipment onboard sailing boats. The goal was to investigate the performance of the motor and find the construction weaknesses and to come up with suggestions how to optimize the performance of the motor.

     

    Tests and measurements were made with a test setup that consisted of inverter, motor and a generator connected to the shaft. The generator stator winding had a short circuit when the load current reached 106,1 A and the tests therefore had to end. The copper wire used in the windings temperature became to high and the isolation of the wire melted.  The tests showed that the motor could handle up to 92,1 A with an efficiency of 70%. It was how much current the winding could withstand together with the power losses that was the limiting factor of the motor construction.

     

    Forced cooling with water cooled stator or improving the winding wires ability to handle higher currents by increasing the cable area are both alternatives to get a better efficiency and motor performance.

  • 14.
    Björnström, Tommie
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Cederqvist, Reidar
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Comparison and Implementation of Software Frameworks for Internet of Things2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is no established standard for how Internet of Things devices are communicating with each other, every manufacturer uses their own proprietary software and protocols. This makes it difficult to ensure the best possible user experience. There are several projects that can become a standard for how devices discovering, communicating, networking etc. The goal for this thesis work was to compare such software frameworks in some areas and investigate how Inteno’s operating system Iopsys OS can be complemented by implement one of these frameworks. A literature study gave two candidates for the comparison, AllJoyn and Bonjour. The result of the comparison showed that AllJoyn was the most appropriate choice for Inteno to implement into their OS. AllJoyn was chosen because it has a potential to become an established standard and includes tools for easy implementation. To make a proof of concept, an AllJoyn application was created. The application together with a JavaScript web page, can show and control options for an AllJoyn Wi-Fi manager application and AllJoyn enabled lamps.

  • 15.
    Boongerd, Sanhawad
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Lindstein, Fredrik
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Analys av datakommunikationssäkerhet för VoIP-protokoll2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Voice over IP (VoIP) is a relatively new technology that enables voice calls over data networks.With VoIP it is possible to lower expenses, and increase functionality and flexibility. FromSwedish Armed Forces point of view, the security issue is of great importance, why the focus inthis report is on the security aspect of the two most common open-source VoIP-protocols H.323and SIP, some of the most common attacks, and counter-measures for those attacks.Because of the level of complexity with a network running H.323 or SIP, and the fact that it hasyet to stand the same level of trial as of traditional telephony, a VoIP-system includes manyknown security-issues, and probably at present many unknown security flaws.

    The conclusion is that it takes great knowledge and insight about a VoIP-network based onH.323 or SIP to make the network satisfyingly safe as it is today, and is therefore perhaps not asuitable solution for the Swedish Armed Forces today for their more sensitive communications.

  • 16.
    Brandt, Theodor
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    System för automatiska rekommendationer av nyheter och evenemang2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Technology is the key for Bonnier Business Media (BBM) to reach their goals and deliver future growth. Therefore they want to be in the very forefront when it comes to exploring new technologies that can improve their platforms and make them more up to date. BBM has among other things aimed to develop a recommendation system that is supposed to make the content of their web sites personalized and in an efficient way present this so that the different target groups will get the information that they expect. For example the visitor should be able to get suggestions on articles and events that might be of interest.

    The aim of this thesis has been to develop a prototype of a recommendation system with associated algorithms. The prototype could be used as to examine the possibility to create personalized recommendations for the readers on BBM:s website va.se (Veckans Affärer). The implementation of the recommendation system that was developed for BBM consisted of an object-based collaborative filtering algorithm using visitor behavior, publication date and popularity of articles and events to create personalized recommendations. After com- pleting tests and analyzes the results show that it is possible to create recommendations with a higher precision than a basic recommendation system, like a popularity list, can of- fer. 

  • 17.
    Brejcha, Kevin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Prestandaanalys av HTTP/22015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Swedbank is one of Sweden’s biggest banks with estimated four million private customers and they are constantly trying to improve their services so they become more user-friendly and faster. To satisfy their customer’s need of fast and easy services Swedbank wants to lower the loading times on the web services to the user experience is faster and smoother, especially for the users doing their banking on a smartphone. The mission is to do a per-formance analysis of the new HTTP protocol HTTP/2 and take out the most essential parts so Swedbank knows what to take advantage of when installing the new versions on their servers to achieve optimal services.The results showed that after implementing HTTP/2’s new features, Swedbank’s website performance increased with 44% in total loading time. The tests were performed in a local experimental environment where the earlier HTTP versions was installed and the perfor-mance metrics was documented.

  • 18.
    Camling, Johan
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Lönnegren, Fredrik
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Karttillämpningar för rikstäckande accessnät2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis describes the process of analyzing and evaluating geographic services, and the development of map applications for nationwide networks. The project was performed at DGC, a datacommunications-, telephony- and networks operator which distributes customer access across Sweden where consumers are connected to the backbone network. In whole, the task consisted of an analysis regarding the possibilities of address-to-coordinate lookup for established customer sites, displaying the access network in a map interface and developing one or more tools, aimed at supporting order processes. Architecture patterns, use-cases construed from user requests and analysis of external provider services for geocoding determined the design of the solution. Software was partially integrated in existing systems, and partially distributed as stand-alone applications. The product was finalized with a release. Read further to get a description of the monitoring tool, network mapping with KML, dealing with geographic data, and also the process of fetching coordinates for addresses.

  • 19.
    Carlid, Olle
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB. KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Hjelm, Mats
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Arbetsmetodik för att minska vattenfotavtrycket: Exemplet Ornö, Haninge2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    In today's society is a large shipment of virtual water between countries in the world. Virtual water refers to all the water consumed to produce a product. From this standpoint, Sweden is importing virtual water from Brazil when we import coffee. Hoekstra and Chapagain have calculated that one cup of coffee contains 140 liters of virtual water. This water is all the freshwater that is consumed in Brazil to grow, package and carry the goods to Sweden. Fresh water is something that exists in limited quantities. In Sweden we have plenty of fresh water, but many of the countries we are importing virtual water from there is a shortages of fresh water. As an example, Sweden is importing large quantities of virtual water from countries like Germany, Spain and India, which today consumes between 40-50% of their renewable water resources. With an increased population and as the temperature increases, this consumption is going to be problematic.

    In order to analyze how much fresh water is actually needed in a country, territory, region or similar Arjen Y. Hoekstra introduced the water footprint concept in year 2002. Water footprint is defined as the volume of water that goes in to producing the products and services consumed in that area. The water footprint is divided into two parts, internal and external water footprint. With the internal water footprint means the total volume of water used by the domestic water in the national economy, minus the virtual water exported to other areas. The external water footprint is defined as the annual volume of water used in other countries to produce the goods consumed in the area and is the part that this degree thesis will be focused on.

    Sweden's total water footprint is estimated to 2150 m

    3/inhabitants/year, this can be taken in relation to the global average, which is 1564 m3

    /inhab/year. Daily the average Swede consumes an average of 5890 liters of water/person/day. 4240 liters of this (72 %) is related to agricultural products, 1320 liters (22.4 %) for industrial products and only 330 liters (5.6 %) water used in the household.

    The purpose of this degree thesis is to develop a methodology for identifying the products that cause a large external water footprint for a local community, how this society affects global water consumption in the form of virtual water and how it can be reduced. The methodology is a step-by-step approach and is divided into four phases. Phase 1. Delimit the study area, Phase 2. Identify the water footprint, Phase 3. Planning measures to reduce external water footprint, Phase 4. Analyze the results. The methodology describes what to think about, what is missing and how to calculate when you want to calculate a local society's external water footprint. The degree thesis is using Ornö as an example to apply the presented methodology on.

    Our example, Ornö, is an island in the Stockholm archipelago. The island which is located in Haninge municipality is sparsely populated, 5.7 inhabitants per square kilometer, compared to iv

    Sweden as a country, which has 22.8 inv/km

    2

    . This means that there is much access to fresh water and good farming opportunities on the island.

    The degree thesis identifies 17 agricultural products that accounts for 60 % of Sweden's external water footprint. Of these 17 products coffee is the individual crop, which accounts for the bulk of Sweden's external water footprint, 16.3 %. In addition to coffee, meat products accounts for about 16 % of the footprint. All of these 17 products are not products that can be replaced with local production. Because of the Swedish climate not all crops are fit to grow there, such as coffee. However, the study shows that 35% of the external water footprint can be replaced with local production.

    To make a study, at a local community, it is above all statistics and data on consumption in the current society that is missing. To overcome this, we see two main solutions. The first is through a detailed survey that produces what people in the society consume in detail. A second solution could be that the Statistiska centralbyrån (SCB), or a similar organization, did a survey on what people in the country with different incomes, ages or other groupings are consuming. In order to transfer it back to the residents in the local community

  • 20.
    Carlquist, Olle
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Boström Leijon, Santos
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Implikat: A System for Categorizing Products using Implicit Feedback on a Website2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Implicit feedback is a form a relevance feedback that is inferred from how users interact with an information retrieval system such as an online search engine. This degree project report describes a method of using implicit feedback to establish relevance judgments and rank products based on their relevance to a specified attribute. The report contains an overview of the benefits and limitations of implicit feedback, as well as a description on how those limitations can be mitigated.

    A prototype that interpreted user actions as relevance votes and calculat-ed a fair relevance score based on these votes with the help of an algo-rithm was developed. This system was then tested on a website with real users during a limited period of time. The results from the test period were evaluated and the system was concluded to be far from perfect, but that improvements could be made by making adjustments to the algo-rithm. The system performed better when looking at the algorithm’s pre-cision rather than its sensitivity.

  • 21.
    Chavez Alcarraz, Erick
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Moraga, Manuel
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Linked data performance in different databases: Comparison between SQL and NoSQL databases2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Meepo AB was investigating the possibility of developing a social rating and recommendation service. In a recommendation service, the user ratings are collected in a database, this data is then used in recommendation algorithms to create individual user recommendations.

    The purpose of this study was to find out which  demands are put on a DBMS, database management system, powering a recommendation service, what impact the NoSQL databases have on the performance of recommendation services compared to traditional relational databases, and which DBMS is most suited for storing the data needed to host a recommendation service.

    Five distinct NoSQL and Relational DBMS were examined, from these three candidates were chosen for a closer comparison.

    Following a study of recommendation algorithms and services, a test suite was created to compare DBMS performance in different areas using a data set of 100 million ratings.

    The results show that MongoDB had the best performance in most use cases, while Neo4j and MySQL struggled with queries spanning the whole data set.

    This paper however never compared performance for real production code. To get a better comparison, more research is needed. We recommend new performance tests for MongoDB and Neo4j using implementations of recommendation algorithms, a larger data set, and more powerful hardware.

  • 22.
    Coskun, Volkan
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Automatisering av underhåll av produkter med inbyggda trådlösa sensorsystem: Fallstudie om tvättmaskin2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This project involves controlling a washing machine and examining it as efficient as possible, with a wireless in-built sensorsystem. The idea with this project is to oversee and connect it to a cloud, where it can be further analyzed. Two cloud services are presented, whereof one of which of them are used. Several usable sensors for the washing machine have been ex-amined and presented in order to find the most appropriate sensors. A smart sensor design is presented which describes the smart sensorsystem on a hardware-and software level. Five different input-/output models are presented.As shown in the results, the most accurate input-/output model is practi-cally tested on the washing machine where the sensorvalues are sent to the cloud, through the wireless embedded sensorsystem. The sensorvalues are thereafter presented on graphs and further analyzed. Simulated graphs with different methods are presented in order to show, that these models can benefit the economy and the environment.The evaluation of the results showed that an automation of the mainte-nance is possible based upon the measurements of the chosen parameters, from the presented input-/output model for a washing machine.

  • 23.
    Cronebäck, Alexandra
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Input interface requirements on board mounted DC/DC converters2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been carried out on behalf of the department of Power Modules at Ericsson.

    In a telecom system interface A is a physical point between the power supply system and the telecommunication equipment described in a European standard called ETSI EN 300 132-2. This interface is also described in the American standard ATIS-0600315.2007. For board-mounted products, such as DC/DC converters, a well-defined input interface description is lacking.

    The goal of this thesis was to evaluate if the requirements in the standards ETSI EN 300 132-2 and ATIS-0600315.2007 are viable for the input interface of DC/DC converters. A part of this goal was also to investigate and analyze how the systems, in which the DC/DC converters operate, works.

    To be able to determine if any of the two standards, ETSI and ATIS, are viable for use for the input interface, both were reviewed and described with focus on voltage levels and transients.

    In the information gathering phase it became clear that an extended limitation was needed. Therefore, in order to investigate what happens from interface A to the input interface of DC/DC converters, the system used in this thesis is the EBS LOD (Ericsson Blade System – Low Ohmic Distribution). EBS is one of the systems in Core sites.

    The report describes the construction of EBS where in the PFM (Power Fan Module), backplanes and various boards are important parts. Furthermore some key principles within Core sites, such as HOD (High Ohmic Distribution), LOD, Two-wire system and Three-wire system, are also described in order to explain how the EBS system works.

    EBS (including PIM (Power Interface Module)) was modeled in OrCad PSpice, with both one board and 26 boards, and was simulated with different transients at an input to the system. The simulation results show that the high voltages never reach the DC/DC converter and that they therefore are well protected from transients in an EBS LOD system.

    In order to determine whether the standards ETSI and ATIS are viable for the input interface of DC/DC converters, it is concluded that more investigations, tests and simulations are needed.

  • 24.
    Dahlberg, Axel
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Francén, Jonas
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    IPv6-adresshantering och prefixdelegering i MPLS VPN-nät2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Full migration to IPv6 brings the need to adjust datacommunication services for the new generationof IP protocols with maintained or expanded functionality. This thesis’ goals is to submitone or more solutions that meets requirements and the technical conditions that enables thecompany DGC:s to expand the service IP-VPN for IPv6. This includes address assignmenttechniques like prefix delegation and automatic address configuration in existing network infrastructure.Solutions are presented in six scenarios that have been investigated considering tests, analysis andexperienced problems. The investigation formed the criteria scalability, configuration complexity,compatibility, support by RFC:s and requirements stated by DGC that adds to the evaluationof the most suitable solution.The evaluation has resulted in a recommended scenario that is implementable according to givengoals.Techniques that may influence the choice of most suitable solution, but that is not yet available,are discussed and presented to point out what may needed to be considered in the future.

  • 25.
    Dilén, Erik
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Lundmark, Emil
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    En utvärdering av Windows 8 Store applikationer som plattform för VOD-tjänster2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As an effect of Video On Demand (VOD)-usage growing fast June, as a software provider for the television industry, wants to acquire skills and evaluate Windows 8 applications as a platform for VOD services. June already delivers a web-based solution for VOD and now wants a comparison and evaluation of particular knowledge required, time, complexity, data caching, advantages and disadvantages of a Windows 8 application set against this web solution.

    The objectives of the thesis can be divided into three parts: one in which complexity and work effort in Windows 8 application development is evaluated, one in which the tools required to develop a VOD application is evaluated and finally implementing a Windows 8 application for VOD.

    A Windows 8 application was developed and the selected solution methods were documented. Documentation and knowledge acquired during the development phase was then used as a basis for the analysis and evaluation objectives. The result is a Windows 8 application meeting the objectives set for the development part followed by an analysis and evaluation answering the given issues.

    Matters that are central through the report are Microsoft, WinRT, VOD, PlayReady, Smooth Streaming, Windows 8 application Development, data caching and interface development in Windows 8.

  • 26.
    Duvheim Bruce, Adam
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Indreeide, Ole Martn
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Beräkning av återmatad bromsenergi på Malmbanan2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Energy is a limited recourse and the use of energy has to be as effective as possible to avoid harmful effects on the environment and to cut spending. Reusing the energy the ore train uses to climb the mountains of northern Sweden through regenerative breaking leads to a more effective use of energy. Calculation of energy uses the trains’ stored energy and the losses during its journey along Malmbanan. This results in a total power save of 20 % for single track and between 20 % and 21 % for double track. Traffic on double track can increase but the relationship between regenerated and consumed energy will be the same. Regenerating energy on the railway reduces today’s negative impact on the environment and leads to savings in energy cost for the company.

  • 27.
    Edlund, Fredrik
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Sarker, Saqib
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Smart Kitchen: Automatisk inventering av föremål2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet of Things is growing fast and is predicted to become a part of everyday life. This can be used to create products which will make everyday life easier. Automated object detection combined with an automated inventory check can make it easier to manage what is in stock, this is something that can be used in smart refrigerators as an example, to make life more convenient through Internet of Things. This Bachelor thesis studies methods regarding object detection with the purpose to build a system which automatically identifies objects and manages the inventory status. A prototype was built and tested to see what the possibilities there is with such a system. The Prototype uses a Raspberry Pi as core unit, which uses Dlib libraries to identify predefined objects. The user will identify unknown objects via the mobile phone application, which makes it possible for the system to learn how to identify new objects. The same application is used to check the inventory status for the different objects that has been identified by the system. The prototype can identify objects and learn to identify new ones, according to the goals of the project.

  • 28.
    Ekman, Jonas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Evaluation of HCI models to control a network system through a graphical user interface2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    SAAB has a project under development for a network system with connected nodes, where the nodes are both information consumer and producer of different communication types. A node is an equipment or an object that are used by the army e.g. it can be a soldier, military hospital or an UAV. The nodes function as a part of a mission e.g. a mission can be Defend Gotland. The aim of this project is that the user will rank different missions from the one with the highest priority to the lowest. This will affect the network in a way that the communication between the nodes at the mission with the highest rank will be prioritised over the communication between the underlying missions. A user can via the GUI rank the missions, and then set the associated settings for them. Via the GUI the user should be able to work at three different levels. The first is to plan upcoming missions. The second one is in real time see if the system delivers the desired conditions. The last one is to simulate if the system can deliver the desired conditions.

    This thesis investigated various HCI models that could be used to create a GUI, to reduce the risk of a user configuring the system incorrectly. The study showed that there are no HCI models that take account for misconfigurations, and therefore a new model was created. The new model was used and evaluated by creating a prototype of a GUI for SAAB’s project and was tested on a potential user. The test showed that the new model reduced the risk of misconfigurations.

  • 29.
    Engström, Magnus
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Soheily, Nadia
    EKG-analys och presentation2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The interpretation of the ECG is an important method in the diagnosis of abnormal heart conditions and can be used proactively to discover previ-ously unknown heart problems. Being able to easily measure the ECG and get it analyzed and presented in a clear manner without having to consult a doctor is improtant to satisfy consumer needs.

    This report describes how an ECG signal is treated with different algo-rithms and methods to detect the heartbeat and its various parameters. This information is used to classify each heartbeat separately and thus determine whether the user has a normal or abnormal cardiac function. To achieve this a software prototype was developed in which the algorithms were implemented. A questionnaire survey was done in order to examine how the output of the software prototype should be presented for a user with no medical training.

    Seven ECG files from MIT-BIH Arrhythmia database were used for validation of the algorithms. The developed algorithms could detect of if any abnormality of heart function occurred and informed the users to consult a physician. The presentation of the heart function was based on the result from the questioner.

  • 30.
    Eriksson, Niklas
    et al.
    KTH, School of Technology and Health (STH).
    Lifvendahl, Patrik
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utbildningssimulator av funktioner i spårfordon: Hårdvarusimulator med felsökning på dörrsystem2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is a description of a developed educational simulator over rail vehicles and its components. The simulator is a hardware-based prototype over a door system on rail vehi- cles. System specialists and technicians will use the prototype. The Simulator should give the user a technical demonstration on how components work in a door system. The proto- type consists of motor, switch, relay and sensor. The components are used for illustration of the functions in a door system on a rail vehicle. The educational simulator is controlled with a control unit and with pushbuttons for manual control. For demonstration of the boarding security an optical sensor is used as symbolize for the obstacle detection.

    The educational simulation has two embedded common faults: cable fault and ground fault. The instruction manual consists of a circuit diagram and is used for troubleshooting. The circuit diagram over the door system is used to find the faults and to correct them. The fault analysis includes the factors, which is the reason for the most common faults to occur in a rail vehicle. Door system receives diagnostic code from a door computer that control priori- tizing for arrangements that will be made.

    Keywords

    Educational simulator, rail vehicle, hardware-based, door system, prototype, obstacle detec- tion, instruction manual, troubleshooting, fault analysis and diagnostic code. 

  • 31.
    Eriksson, Niklas
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Lifvendahl, Patrik
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utbildningssimulator av funktioner i spårfordon: Hårdvarusimulator med felsökning på dörrsystem2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is a description of a developed educational simulator over rail vehicles and its components. The simulator is a hardware-based prototype over a door system on rail vehi- cles. System specialists and technicians will use the prototype. The Simulator should give the user a technical demonstration on how components work in a door system. The proto- type consists of motor, switch, relay and sensor. The components are used for illustration of the functions in a door system on a rail vehicle. The educational simulator is controlled with a control unit and with pushbuttons for manual control. For demonstration of the boarding security an optical sensor is used as symbolize for the obstacle detection.

    The educational simulation has two embedded common faults: cable fault and ground fault. The instruction manual consists of a circuit diagram and is used for troubleshooting. The circuit diagram over the door system is used to find the faults and to correct them. The fault analysis includes the factors, which is the reason for the most common faults to occur in a rail vehicle. Door system receives diagnostic code from a door computer that control priori- tizing for arrangements that will be made. 

  • 32.
    Ernmark, Niklas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utveckling av en CAN-adapter i ett sensorsystem för övervakning av däcktryck.: Development of a CAN-adapter in a sensor system for tire pressure monitoring.2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes a degree project at the Royal Institute of Technology. The purpose was to create a unique system solution in which a CAN adapter card (Controller Area Network) was to be integrated with an air pressure monitoring system for heavy duty vehicles. The goal was to present measurement values ​​from valve sensors on a personal computer. The air pressure monitoring system is called J1939 - TPMS and is a finished product. J1939 - TPMS sends CAN-frames to a CAN-bus in J1939 format. These frames are to be read by the adapter card and presented on a terminal program on a personal computer. The job has been to investigate how the J1939 - TPMS system works in detail. The role of the J1939 protocol and its relationship with CAN has been clarified. Also, a detailed description of how J1939 frames are interpreted and how the measuring data TPMS is decoded is done. Principles for how a CAN node works has been clarified. Based on this, a CAN adapter card has been designed. The design has included component selection, design of electronics schema, design of computer cards and development of embedded software. The result was a ready-to-use CAN adapter card tested with J1939-TPMS. Requirements for the project were met. However, more work with the card will be needed to make it a finished product. The work was carried out at Motion Control in Västerås AB in cooperation with Transeco Däckservice (Transeco Tire Service).

  • 33.
    Ezzeddine, Kassem
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Oskarsson, Robert
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Analys av kondensatorbatteriers tillkopplingsfenomen: Undersökning av de kopplingsfenomen som uppstår vid tillkoppling av kondensatorbatterier och deras påverkan på närliggande komponenter2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Many electrical devices need reactive power to operate. Transmission of reactive power occupies a proportion of the available capacity in the power system and therefore capacitor banks are used near to the end user to generate reactive power. Thus, the reactive effect is generated and consumed in a separate part of the power system. Capacitor banks switching causes transients which may damage the surrounding components.

    Based on the real substation Stallbacka in Trollhättan, this study has analysed capacitor banks switching transients within the medium voltage level. The analysis has covered the size of these transients according to different conditions and scenarios. The result showed that the transients in this case never reached serious levels, thus there was no impact on the components. It is not clear whether the transients affect the power quality because there are no defined limits. 

    A calculation tool to the predicted transients was supposed to be created in the process. This calculation tool was never completed due to the unmanageable solution that was obtained.

  • 34.
    Foitzik, John
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Comparison between two methods for 3D imaging of machine parts2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today the production time is shortened when components are made with additive manufac- turing and the finished products typically have very few defects. If the components quality is to be validated, it’s done with a Non-destructive testing method. In this thesis a test piece made of Inconel 939, that is used in high temperature application was examined with a non- destructive testing technique (NDT), computed tomography (CT) and with destructive test- ing (DT) by grinding the test piece down to a given position and taking images of the ex- posed surface. The purpose was to validate computed tomography images by doing a two- dimensional correlation between images from CT and DT using MATLAB. Due to tech- nical problems the resulting images were however not showing the same par of the test piece. Therefore the correlation method was instead validated. Modifying a 2D image from CT and running it in the code written in MATLAB could quantify the distortions in the images. Results are presented in figures and in tables. The table shows more detailed in- formation with exact coordinates and what correlation each area has. The figure shows the movements and direction of the changes. The result shows that the method can detect changes and does what was intended. 

  • 35.
    Freij, Urban
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Modelldriven arkitektur förbättrar hanteringen av problemet med import av data till ER-modeller2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In many situations it is desirable to import data from text files, excel files and similar to a database. To do so the data needs to be translated at some stage to an ER model (Entity Relationship), i.e. a model describing relevant parts of a database schema. The approach for this translation varies from case to case.

    During this thesis an application has been developed to import data to an ER model from a modeling perspective, in line with the Model Driven Architecture (MDA) ™. The gain lies in using a metamodel that describes how different models for transformation from grid tables to an ER mode may look like. The models in turn describe how the transformation will look, thus allowing the usage of several different models without any need of changes to the source code.

    The metamodel describing the transformation of data can be visualized in a class diagram. The class diagram schematically describes the relationships between tables of data to be imported from and the ER model the data will be transferred to. Preferable is to write a model in an XML that conforms to the metamodel. Therefore the class diagram should be transformed into an XML schema that enables validation of the model in the XML file.

  • 36.
    Frisell, Johan
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Personligt konto för hälsoinformation2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis investigates the personal account for health information (PHR) that every citizen in Sweden will be offered. The Ministry of Health and Social Affairs has made a decision to conduct a public procurement through Apotekens Service AB. The pro-curement was not finalized at the time of this report.The goal of this thesis is to on behalf of Mawell investigate what business opportunities the launching of a nationally provided service for PHR, and the ecosystem for applica-tions and services, is expected to result in, but also to implement two services to demonstrate the concept of how a service could be used to create benefits for a selected target group.During the thesis work a literature study and interviews with different target groups were performed. The purpose with the interviews was to identify different problems that the target group have in their operations and then analyze and give a proposal to how services developed for PHR could solve the problems.The result of the investigation is proposed services based on the different problems and needs of the targets groups and two service implementations. The report also gives Mawell proposal to how they could continue this work further.

  • 37.
    Gabrail, Philip
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Samuelsson, Sam
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Analys av fältfördelning i kabelavslut av linjära och icke linjära material: Analysis of the field distribution in cable termination by linear and nonlinear material2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays XLPE high voltage cables are used in transmission and distribution of electrical power and has an important role in the electrical system. Power transmission that occurs over long distances is diverted from one point to another and is done with the help of cable terminations. These cable terminations have some vulnerabilities that affect the entire power system.

    The theoretical part of the report was carried out with the help of FEM software Comsol Multiphysics. Results showed that the highest field concentration occurs at the insulation of the cable and caused malfunction and vulnerabilities. In the linear case for the electrical part resulted a high permittivity that the potential and the electric field was reduced, which showed the same result for low conductivity. For the nonlinear material the conductivity changes with the electric field and time.

    The temperature of the linear case showed that at high temperatures the material became more conductive. In the nonlinear case the conductive material was reduced. This could be controlled with different threshold value (Eb) which cannot in the linear case.

    The practical part was done in E.ON:s laboratory for different type of cable terminations that were tested with 33kV. Some of the tested cable terminations were used for testing purposes and was picked out of operation because of a malfunction in the cable. An attempt to control field concentration was carried out in the laboratory and resulted to a reduced field  istribution in the cable termination. The result of the practical part showed how the field concentration was distributed in the cable termination and that the field distribution led to the collapse of the cable.

  • 38.
    Gerkens, Rick
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Berg, David
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Elkvalitéproblem vid varvtalsstyrd motordrift i industrimiljö2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Harmonics caused by variable speed drives create problems in industrial systems. The purpose of this study is to identify these problems and give recommendations to avoid them. The study was conducted as a bachelor thesis at the Royal Technical University in Stockholm, Sweden for the consultant company Ramboll Energy. A literature review was combined with electrical power quality measurements on variable speed motor operations conducted at Sandvik Mining in Sandviken, Sweden.

    Electrical quality problems caused by variable speed drives origin mainly from frequency inverter control that gives a non-linear current usage which, if the grid is not strong enough, affects voltage quality. Examples of problems are production downtime, disruption and malfunction of equipment and increased wear of equipment.

    This study shows that when making changes in systems containing harmonics, future harmonic levels can be approximated in some cases. Measurements before the change provide input data to model the system, describing the load as a harmonic current generator. With some assumptions on the grid impedance, calculating an approximation on harmonic after the change is possible.

    This study has used a simplified model for the prediction of harmonic levels after a change in the system. The purpose is to propose a cost effective way to approximate so that information on how to prevent problems …in the decision making. Electrical power quality problems could be prevented more often and not doing that is a waste of economical, environmental and social resources.

  • 39.
    Gidlöf Örnerfors, Linus
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Testautomatisering av linjärmotorer2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This diploma work has been carried out on behalf of Stegia AB. Stegia manufacturesand sells linear motors that are tested in a test bench before shipped to thecustomer. Today there is a need for a test bench that collects test results from theperformed tests. The company would like to lower the risk of falsely made tests,and to make the test bench easier for the production staff to use. At this moment,the test of the linear motors is made up of several manual tasks before the test iscompleted. This increases the risk of wrong results because of incorrectly madetests, with no traceability of the results. The goal with this diploma work is to lowerthe risk of incorrect test result by automating the testing process for the productionstaff. The result is presented as a prototype, that should increase the reliability ofthe test result of the motors. The result is then validated and analyzed in this report.

  • 40.
    Grahn, Erik
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Evaluation of MEMS accelerometer and gyroscope for orientation tracking nutrunner functionality2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the production industry, quality control is of importance. Even though today's tools provide a lot of functionality and safety to help the operators in their job, the operators still is responsible for the final quality of the parts. Today the nutrunners manufactured by Atlas Copco use their driver to detect the tightening angle. There- fore the operator can influence the tightening by turning the tool clockwise or counterclockwise during a tightening and quality cannot be assured that the bolt is tightened with a certain torque angle. The function of orientation tracking was de- sired to be evaluated for the Tensor STB angle and STB pistol tools manufactured by Atlas Copco. To be able to study the orientation of a nutrunner, practical exper- iments were introduced where an IMU sensor was fixed on a battery powered nutrunner. Sensor fusion in the form of a complementary filter was evaluated. The result states that the accelerometer could not be used to estimate the angular dis- placement of tightening due to vibration and gimbal lock and therefore a sensor fusion is not possible. The gyroscope by itself can be used to provide the angular displacement around every axis with high accuracy without taking into account the gimbal lock phenomena or external forces in the form of vibration of the tool. The gyroscope provided data with a probability to measure ±1° in future tightenings by 69,76%. The gyroscope provided data with high accuracy and stability and can be used in real world application and production for true angle functionality of the tools. 

  • 41.
    Grip, Johan
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Djampou, Serge
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Elkraftsystem för fälttest av Polygeneration system EXC2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In a modern society electricity is a key component for the development of the individual, industry, and society. Natural disaster areas where the electricity has been knocked out face great trials in order to get vital public functions working again. With the help of the mobile eco-friendly energy device Emergency Energy Module (EEM) electricity needs can be eased.

    The goal of thesis was to produce an electrical power system description for the upcoming Export container (EXC), and to generate a correct circuit diagram for the existing Emergency energy module (EEM).

    The electric power description must take into account EXC's specifications and include Bills of Material (BoM) and circuit diagram. The problems lies in getting the various sources of energy (solar, wind and biomass gasifier) to work together in a power system where DC, AC, three-phase and single-phase are mixed. Great emphasis is also given to obtain a flexible electricity systems that can be relatively easily changed for different customer needs.

    The making of this thesis was carried out initially with a gathering facts phase. This was followed by a review and analysis of the EEM's electrical system which resulted in a circuit diagram and a manual.

    Weaknesses in EEM's electrical system was considered to be the lack of overvoltage protection and residual current device, measuring point 5 was misplaced, measuring equipment should for safety reasons be firmly attached and 1-phase generator should be used in biomass gasifier to remove uneven load problems. The existing Power router, whose task is to control the energy flow in the system, was limited because it could only receive one AC power source, handle only one-phase and had a relatively low maximum output power of 5.5 kW.

    Whit the help of the analysis improvement suggestions above and with EXC's specification taking into account was then an electric power system for EXC constructed. with associated BoM, circuit diagram, specifications for subsystems and proposals for candidates that meet these.

    The electrical system is recommended to be built around the Power router Quattro which provides great opportunities for flexibility in terms of being able to scale up the system if such more power would be desired by the customer, or if there is a need for 3-phase systems. A variety of programming settings can then be made which facilitates the construction of specific electrical systems for varying customer needs.

  • 42.
    Gustavsson, Robert
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering. KTH.
    Lind, Alexander
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering. KTH.
    Utvärdering av energiförbrukning av ett IoT-system för övervakning av hundars rörelsemönster2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Tracy Trackers is currently developing an AI platform which purpose is to monitor a dog's movement pattern. The platform consists of hardware with accelerometer, gyroscope, temperature and humidity sensors attached to the dog. The hardware is connected to a mobile through Bluetooth. A study was conducted to investigate which batteries that are available on the market and which ones that fit best for the prototype. The aim of the study was to find a rechargeable battery with long operat-ing hours that is economically and environmentally viable for future production. Hardware for monitoring the battery voltage characteristics was built to determine differences between kinds of batteries and if there was an optimal type of battery for the specific product. The sensors used by the prototype were studied using os-cilloscopes and a self-constructed circuit in order to be able to determine power consumption at different sampling frequencies. Furthermore, a circuit was built for filtering out certain frequencies to determine the current consumption of the DC-components. The current consumption measured by the tests in this study refers to what draws current in the prototype. The developed hardware can be used for measurements of future prototypes

  • 43.
    Haidari, Bahaman
    et al.
    KTH, School of Technology and Health (STH).
    Holm, Isak
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Verifiering av ERTMS-signalprojektering: Tillämpning mot Estland2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    EU has a framework that strives to interoperability to make it easy to travel and do business with all nations in the EU without the need to change trains or drivers. This report discribes the various laws and regulations that issued and specified by the EU Commission, UNISIG and the Swedish national rules that apply for ERTMS signalling project planning for trackside equipment. Today there is a need to more efficient the signal project planning. To achieve this, a checklist for signaling project planning will be developed that clear show, for example, where an Eurobalise in relation to a signal point should be located by referring to the correct subchapter in the right document.

    The mission of the project is to make it easier to design new production of ERTMS signalling project planning. To make this be possible studies has been done to TSI, SUBSET (the documents that controls and regulates the ERTMS signalling), relevant documents and analysis already implemented signalling project planning on Ådallines.

    The report presents a compilation of the signal project and how the different phases will occur, how they will be implemented and their significance.

    In this report, the group has produced a complete compilation of the processed documents for ERTMS signalling project and a checklist for verification of the ERTMS signalling project.

  • 44.
    Hama-amin, Samman
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Veldre, Andrejs
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Investigation of power supplies used in OSC9502013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    SammanfattningOCS950(Object Controller System 950) är en av Bombardiers produkter som hanterar säkerhetssystemet i järnvägstrafiken. Det består av olika delsystem och strömförsörjs mha nätaggregat (PSU – Power Supply Unit). I den här rapporten undersöks den befintliga PSU74-modellen samt nya switchade nätaggregat som finns på marknaden.Bakgrunden till att Bombardier vill byta ut PSU74 mot ett nytt switchat aggregat är att PSU74 har en vikt på 14 kg och tar stor plats i el-skåp. Ett swichat nätaggregat väger ungefär 1,5 kg och är så pass kompakt att det tar litet utrymme i el-skåpet.Bombardier har medvetet väntat med att gå över till SMPS eftersom tillförlitlighet blir ett problem. Detta problem kan lösas mha redundanta kopplingar. MTBF är den största utmaningen vid övergång till SMPS. MTBF beräkningar för redundanta kopplingar presenteras i rapporten och resultatet visar att ju fler enheter ett system innehåller desto mindre blir MTBF-värdet.I faktainsamlingsdelen beskrivs och förklaras olika viktiga begrepp för att underlätta förståelse av rapporten. MTBF, linjära och switchade nätaggregat är bara några begrepp som tas upp.En studie av PSU74 och en lista över dess viktiga egenskaper presenteras, det är en utgångspunkt för kravspecifikation för nytt switchade nätaggregat. Vissa egenskaper som prioriteras är MTBF, in-och utspänning, vikt och drifttemperatur mm.Ett enkelt kretsschema konstrueras och visar principen för redundant koppling. Kravspecifikationen finns i ett tabellformat. De flesta egenskaper är definierade men vissa är ej fastställta. Bombardier definierar värde på dessa egenskaper efter diskussion med potentiella tillverkare.En alternativ lösning presenteras där ett uppvärmningsförslag av el-skåp läggs fram. Denna metod kan bredda urval av SMPS på marknaden. En omfattad undersökning av marknaden genomförs där olika modeller analyseras baserade på kravspecifikationer. En utmaning är omgivningstemperaturen eftersom de  flesta SMPS tål – 25°C minimum drifttemperatur. Några modeller som uppfyller kriterierna undersöks noggrant och systematiskt. Analys av utvalda SMPS utförs och slutsatser presenteras där för- och nackdelar med respektive modell lyfts fram. Det konstanteras att modell från Cosel TUFS300F28 är ett bra alternativ för ersättning av PSU74.

  • 45.
    Hammer, Joakim
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Lind, Olle
    KTH, School of Technology and Health (STH), Data- och elektroteknik.
    Scalable platform for health service integrations2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis was performed at the company ShapeUp Club located in Stockholm, Sweden. ShapeUp Club offers a digital calorie counter service for the web, iOS and Android with data synchronization across the platforms.

    ShapeUp Club wants to provide their users with the option to synchronize data between ShapeUp Club and external health services. The objective for this thesis has been to develop an extension to ShapeUp Clubs current backend platform where new external health services can be plugged-in quickly and scalable. External partner APIs will be examined and implemented in the system to validate the functionality of the system. The amount of code needed to plug-in a service should be as minimal as possible for a developer to quickly add another service. To allow for scalability the platform also needs to adapt logic for how often users should be allowed to poll for data from their connected services, to minimize the database load for all parts.

    To handle these demands, an extension to ShapeUp Club’s current backend solution was built using the Django framework for Python. By providing a generic base class that new services inherit from, the amount of code necessary for implementing a new service is reduced to methods for API- requests, authorization and serialization of data. To reduce the number of redundant poll requests, users are placed into groups. Each group is a cluster of users with similar frequency of updates. Django’s cache framework is used to handle the concurrency of the sync tasks, which locks a user from syncing the same partner in parallel. 

  • 46.
    Harch, Gais
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Ullström, Robin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Automatiserad matchning av relaterad data från olika datakällor2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Social media today contains a lot of information that can add a great value for applications and products by achieve an improved user experience. In some cases, such information cannot be obtained without matching data from one or several data sources through a data fusion.

     

    Eniro Initiatives AB wants to explore opportunities to implement an automated data fusion model by matching companies from its own API to the corresponding company on social media. The problem is that the only completely secured data of matching of all Swedish companies is its corporate identity, which is data that is not available with APIs that origin from foreign companies. The aim was to explore possibilities for the automated way to match related data from different data sources.

     

    In this thesis, a prototype was developed to match companies from Eniro’s API with company pages from Facebook's API. The results from the tests of this prototype shows small deficiencies where redundant information made the prototype able to approve unofficial pages with links to the relevant company, which was not desirable.

  • 47.
    Hassan, Waleed
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Hellström, Martin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Realtidsövervakning av multicastvideoström2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The enormous increase in multicast services has shown the limitations of traditional network management tools in multicast quality monitoring. There is a need for new monitoring technologies that are not hardware-based solutions such as increased link throughput, buffer length and capacity to enhance the quality of experience. This paper examines the use of FFmpeg, and OpenCV as well the no-reference image quality assessment algorithm BRISQUE to improve the quality of service as well as the quality of experience. By detecting image quality deficiencies as well as bit errors in the video stream, the QoS and QoE can be improved. The purpose of this project was to develop a monitoring system that has the ability to detect fluctuations in image quality and bit errors in a multicast video stream in real time and then notify the service provider using SNMP traps. The tests performed in this paper shows positive results when using the hybrid solution proposed in this paper, both BRISQUE and FFmpeg alone are not sufficiently adapted for this purpose. FFmpeg has the ability to detect decoding errors that usually occurs due to serious bit errors and the BRISQUE algorithm was developed to analyse images and determine the subjective image quality. According to the test results BRISQUE can be used for multicast video analysis because the subjective image quality can be determined with good reliability. The combination of these methods has shown good results but needs to be investigated and developed further.

  • 48.
    Hededal Klincov, Lazar
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Symeri, Ali
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Devising a Trend-break-detection Algorithm of stored Key Performance Indicators for Telecom Equipment2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A problem that is prevalent for testers at Ericsson is that performance test results are continuously generated but not analyzed. The time between occurrence of problems and information about the occurrence is long and variable. This is due to the manual analysis of log files that is time consuming and tedious. The requested solution is automation with an algorithm that analyzes the performance and notifies when problems occur. A binary classifier algorithm, based on statistical methods, was developed and evaluated as a solution to the stated problem. The algorithm was evaluated with simulated data and produced an accuracy of 97.54 %, to detect trend breaks. Furthermore, correlation analysis was carried out between performance and hardware to gain insights in how hardware configurations affect test runs.

  • 49.
    Hermansson, Rickard
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Hellström, Johan
    KTH, School of Technology and Health (STH).
    Discretionary Version Control: Access Control for Versionable Documents2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A common problem in the workplace is sharing digital documents with coworkers. Forsome companies the problem extends to wanting the documentskept internally backedup and controlling which people in the company has rights to read and revise certaindocuments.This paper shows different systems and models for access control, version control,and distribution of the documents that can be used to create asystem that solves theseproblems.One requirement for this system was a user interface where users can upload, down-load and manage access to their documents. Another requirement was a service thathandles version control for the documents, and a way to quickly connect and distributethe documents. The system also needed to be able to handle access control of the ver-sioned documents on document level, referred to as "fine grained access control" in thispaper.These models and systems were evaluated based on aspects of the access control mod-els, version control systems, and distribution systems andprotocols. After evaluating,appropriate selections were made to create a prototype to test the system as a whole.The prototype ended up meeting the goals that Nordicstationset for the project butonly with basic functionality. Functionality for retrieving any version from a docu-ments history, controlling access for the documents at document level, and a simpleweb based user interface for managing the documents.

  • 50.
    Herrlin, Emma
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Alternativa reglermetoder för en energieffektiv byggnad2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Ungefär 60 % av den totala energianvändningen för uppvärmning (inklusive varmvatten) i Sverige går åt till att värma upp flerbostäder och lokaler, vilket ger en indikation på att det finns potential att minska energianvändningen ytterligare genom att hitta alternativa metoder för styr- och reglering av befintliga värmesystem. En viktig faktor oberoende av vilken metod som används är att veta byggnadens dynamiska egenskaper. Det finns en rad olika metoder på marknaden för att kunna minska energianvändningen och en del av dem är välbeprövande medan andra fortfarande är på forskningsnivå. Den beprövade metoden är prognosstyrning vilket också utvärderades vidare i examensarbetet genom en studie av tidigare utförda arbeten inom området. En gemensam och viktig faktor för att kunna spara energi för uppvärmning i byggnader är att veta byggnadens tidskonstant, även kallad värmetröghet. För att påvisa dess betydelse utfördes simuleringar i ett program som heter TEKNOsim som är utvecklat av Chalmers tekniska högskola. Resultatet från simuleringarna som utfördes för 6 olika scenarier visade att den stora faktorn som påverkade byggnaden var internvärmen från belysning, apparater och personer. En yttre påverkande faktor som också hade betydelse var solavskärmning för fönsterna vilket gav en jämnare rumstemperatur. Då simuleringarna anpassades till två olika driftfall för ventilationssystemet till ”kontorstid” och ”utanför kontorstid” höll sig rumstemperaturen inom ramen för högsta och lägsta temperatur under tiden då kontoret var bemannat. En annan metod som användes var en litteraturstudie för arbeten inom området prognosstyrning. För de arbeten som valdes ut undersöktes två olika leverantörer som är marknadsledande i Sverige, eGain och Kabona. I snitt visade resultaten en besparing på 10–15% för uppvärmningskostnaderna men den individuella spridningen för eGains prognosstyrning var stor. Vissa fastigheter hade ingen besparing alls medan andra hade en besparing på 26%. Den stora spridningen berodde antagligen på att det nya systemet endast varit igång i 6 månader då studiens utfördes, vilket är för kort tid för att få några tillförlitliga resultat. För Kabonas tjänst Ecopilot var resultaten mer jämna.

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