Change search
Refine search result
141142143144145146147 7151 - 7200 of 7429
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the 'Create feeds' function.
  • 7151.
    Wismén, May
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Kunskapsprocesser inom hälso- och sjukvård - en studie av kunskapsintegrering mellan laboratorium och dess kunder2004Licentiate thesis, monograph (Other academic)
    Abstract [sv]

    Samarbete inom hälso- och sjukvård är grundläggande för att patienter ska få säker och bra vård. Laboratorier tillför viktiga pusselbitar för diagnos och behandling, vilket kräver integrering av kunskap mellan laboratorium och dess kunder. I det dagliga arbetet sker denna integrering primärt via ett informationssystem bestående av remisser och svar.



    Detta arbetes syfte är att ur ett relationsperspektiv beskriva, tolka och förklara den kunskapsintegrering som sker mellan olika grupper inom hälso- och sjukvård. En kvalitativ, tolkande fallstudie har genomförts vid ett mikrobiologiskt laboratorium och fyra av dess kunder. Två teoretiska källor communities of practice och kunskapsepisoder har sammanfogats till en övergripande analysmodell, vilken tillsammans med kompletterande teorier har använts i analysen.



    Studien visar hur kunskapsintegrering sker som en del av de dagliga arbetsprocesserna och vilka förutsättningar som bör finnas för att kunskapsintegreringen ska fungera. Studien visar också på problem som kan uppstå när förutsättningarna inte uppfylls. Den kunskap som integreras är en kombination av tyst och explicit samt individuell och organisatorisk kunskap, vilken successivt byggs upp hos såväl individer som grupper. Lyckad kunskapsintegrering bygger på förståelse för varandras perspektiv samt en vilja att förändra existerande kunskap. Hinder är brister eller avsaknande av feedback, intresse och motivation, tid för reflektion samt forum för perspektivskapande.



    May Wismén har sin tjänst vid Internationella handelshögskolan i Jönköping, är inskriven för forskarstudier vid Karlstads universitet och tillhör forskarskolan Management och IT

  • 7152.
    Wismén, May
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Carlsson, Sven
    A relational perspective on knowledge integration between self-contained work groups: a case study in the health care sector2006Conference paper (Refereed)
    Abstract [en]

    A main purpose of information systems (IS) is to support intra- and inter-organizational collaboration. From a collaboration perspective, information transfer gets a meaning if the transferred information is converted to knowledge. If we instead of an information perspective take a knowledge perspective on collaboration, stressing knowledge integration, many other factors than the IS itself and information characteristics will be critical. Working routines and the way information is interpreted, both by the sender and the receiver, will be stressed. Research focusing IS-supported collaboration and knowledge management is needed. This paper presents such an empirical study. Focus in the study is on knowledge integration between different self-contained work groups and the study explores how knowledge integration is accomplished and why the integration is not always simple and successful. The empirical context is the Swedish health care and more specifically, the daily knowledge integration between a microbiology laboratory and its customers. Empirical data was collected by interviews and observations, and analysed with help of a theoretical model constructed from two main theories: Community of Practice (CoP) and Knowledge Management Episodes. This model implies that knowledge should be seen as a process and in a relational perspective. The study shows that there is a mutual dependency between the IS and other knowledge resources in the organization. Even if the groups have the same overarching goals, regulations, and the same IS, the different groups create their own working routines, ways of interpreting information, and their own ways to convert information to knowledge. This situational and emergent development of work practice around IS suggests that management of existing IS and the implementation of new IS needs to stronger focus the mutual influence between IS and working activities and that feedback in the integration process is important

  • 7153.
    Wissmach, Toni
    University West, Department of Economics and IT, Division of Computer Engineering.
    USB 3 jämfört med 2.0: En jämförande studie om bulköverföringar2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Fokuset i denna studie ligger huvudsakligen på en av de fyra överföringstyper som USB 2 och 3 använder sig av, bulköverföringar. Från den valda typen av överföring kommer tider och hastighet mätas i tolv testfall. Alla testfall delas in i två grupper ett där mätningarna genomförs under tiden media strömmas ifrån en annan USB-enhet för att belasta USB-bussen. Och ett annat där bussen är obelastat. Värden visas och jämförs sedan med hjälp av grafer och histogram där medelvärden, standardavvikelser samt variationskoefficienten har tagits fram.

    Resultatet i denna studie visar att USB 3 en högre variationskoefficient i vissa lägen. Mätvärden visar att USB 3 har ett lägre variationskoefficientvärde när testdatan består av många små filer än vad det gör för USB 2. Dock ökar variationskoefficienten för USB 3 när filstorleken blir större jämfört med USB 2 som påvisar en sjunkande variationskoefficient.

  • 7154.
    Wistrand, Henrik
    University of Skövde, School of Humanities and Informatics.
    Vad har svenska företag för syn på sovande data och hur hanterar svenska företag sovande data med avseende på identifiering och lagring?2004Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Alltför många organisationer har datalager innehållande stora mängder sovande data, det vill säga data som sällan eller aldrig används. Sovande data påverkar en organisations datalager negativt eftersom den försämrar datalagrets prestanda, kostar pengar i onödan och påverkar datalagrets infrastruktur negativt. Enligt Inmon, Glassey och Welch (1997) är det en mycket svår och komplex process att rensa ut sovande data ur sitt datalager. Administratören måste ha kunskap om vilka datatabeller i datalagret som används och vilka rader utav data som används för att kunna ta bort data från datalagret. Enligt Inmon m.fl. (1997) är det nödvändigt att använda någon form av metod för att kunna identifiera vilken data i datalagret som kan klassas som sovande data. Syftet med arbetet är att undersöka hur svenska företag hanterar sovande data för att ta reda på vilka metoder de använder för att identifiera sovande data och vad de gör med den datan som blir klassad som sovande data.

  • 7155.
    Wistrand, Kai
    Örebro University, Swedish Business School at Örebro University.
    Method rationale revealed: communication of knowledge in systems development methods2009Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The practice of developing information systems with the support of information systems development methods is not new. A vast number of systems development methods have been suggested over the years in an attempt to solve the problems a development organisation might encounter. From early approaches like the Waterfall model to more modern monolithic methods such as the Rational Unified Process and the newest approaches exemplified in the Agile methods, the ambition has often been to find the silver bullet and the most effective ways to produce quality systems.

    Methods are prescriptive by nature as they suggest action and as such they represent rationale. Thus, one can speak of a method rationale as the dimension within methods that motivate their existence. Method rationale is understood as the goal and value rational relations between a method’s underlying philosophy and its proposed actions.

    During the methods’ evolution, the practice of systems development and the supporting systems development methods have been subjected to research from many perspectives. One possible way to understand the nature of the existing research is to separate it into two fields. The suggested fields have different strengths and weaknesses. The field of traditional research on information systems development (ISD) emphasise relevance in their studies but often overlook aspects of generalisation. The field of method engineering (ME) is highly formalistic and emphasise rigour but often miss aspects concerning relevance, such as the role methods play in peoples daily systems development efforts. In this dissertation, a polarisation of existing systems development method research is suggested in order to find a synthesis more capable of serving as a common ground for method research and for the understanding of the systems development method phenomenon. This is achieved through a proposed extension of the field of ME into the field of extended method engineering (EME).

    The foundation of the EME is found in the concept of method rationale and a method component concept design capable of carrying and expressing method rationale. The method component concept design is applied, evaluated, and re-designed in three different empirical settings in order to ascertain its practical potential and the benefits in explicating the dimension of method rationale.

  • 7156.
    Wistrand, Kai
    et al.
    Örebro University, Department of Business, Economics, Statistics and Informatics.
    Karlsson, Fredrik
    Örebro University, Department of Business, Economics, Statistics and Informatics.
    Method components: rationale revealed2004Conference paper (Refereed)
  • 7157.
    Wistrand, Kai
    et al.
    Örebro University, Swedish Business School at Örebro University.
    Karlsson, Fredrik
    Örebro University, Swedish Business School at Örebro University.
    Ågerfalk, Pär J.
    Uppsala universitet.
    Exploring the role of method rationale in the context of teaching information systems development methods2010In: Information systems development: towards a service provision society / [ed] George A. Papadopoulos ..., Heidelberg: Springer, 2010, p. 801-809Conference paper (Refereed)
    Abstract [en]

    Research has shown that traditional education in systems development has its limitations. This chapter draws on recent research on a component-based view of systems development methods. The aim is to explore the impact of applying a method rationale perspective during method teaching with regards to student’s abilities to reason about the suitability of a particular method to various development settings. A qualitative research approach was adopted, which used two different approaches to teaching a particular method to two groups of students. The students’ ability to reason about the method in modelling seminars and follow-up interviews was analysed. The results indicate that explicating method rationale in teaching methods may have a positive impact on students’ ability to reason about methods and method tailoring.

  • 7158. Witrant, E.
    et al.
    D'Innocenzo, A.
    Sandou, G.
    Santucci, F.
    Di Benedetto, M. D.
    Isaksson, A. J.
    Johansson, Karl Henrik
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Niculescu, S-I
    Olaru, S.
    Serra, E.
    Tennina, S.
    Tiberi, U.
    Wireless ventilation control for large-scale systems: The mining industrial case2010In: International Journal of Robust and Nonlinear Control, ISSN 1049-8923, E-ISSN 1099-1239, Vol. 20, no 2, p. 226-251Article in journal (Refereed)
    Abstract [en]

    This paper describes a new industrial case on automation, for large-scale systems with high environmental impact: the mining ventilation control systems. Ventilation control is essential for the operation of a mine in terms of safety (CO and NO, regulation) and energy optimization. We first discuss a novel regulation architecture, highlighting the interest for a model-based control approach and the use of distributed sensing capabilities thanks to a wireless sensor network (WSN). We propose a new model for underground ventilation. The main components of the system dynamics are described with time-delays, transmission errors, energy losses and concentration profiles. Two different model-based control approaches, which can embody the complex dynamics of the system, are proposed. The first one resorts to a nonlinear model predictive control strategy (receding horizon) and aims to energy minimization, thanks to a continuous operation of the fans. The second one, based on a hybrid description of the model and fans operation, provides automatic verification of the wireless control thanks to abstraction techniques. These control strategies are compared with simulations, in terms of regulation efficiency, energy consumption and the need for computational capabilities. The industrial case description and control strategies open new vistas for the development of global system approaches that allow for the optimization of energy consumption of complex large-scale systems.

  • 7159.
    Wittek, Peter
    et al.
    University of Borås, Swedish School of Library and Information Science.
    Darányi, Sándor
    University of Borås, Swedish School of Library and Information Science.
    Dobreva, Milena
    Matching Evolving Hilbert Spaces and Language for Semantic Access to Digital Libraries2010In: The Role of Digital Libraries in a Time of Global Change. Proceedings of the 12th International Conference on Asia-Pacific Digital Libraries, ICADL 2010, Gold Coast, Australia, June 21-25, 2010. / [ed] Gobinda Chowdhury, Chris Koo, Jane Hunter, Springer , 2010, p. 262-263Conference paper (Other academic)
    Abstract [en]

    Extended by function (Hilbert) spaces, the 5S model of digital libraries (DL) [1] enables a physical interpretation of vectors and functions to keep track of the evolving semantics and usage context of the digital objects by support vector machines (SVM) for text categorization (TC). For this conceptual transition, three steps are necessary: (1) the application of the formal theory of DL to Lebesgue (function, L2) spaces; (2) considering semantic content as vectors in the physical sense (i.e. position and direction vectors) rather than as in linear algebra, thereby modelling word semantics as an evolving field underlying classifications of digital objects; (3) the replacement of vectors by functions in a new compact support basis function (CSBF) semantic kernel utilizing wavelets for TC by SVMs.

  • 7160. Wißotzki, Matthias
    et al.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    The Digital Business Architect - Towards Method Support for Digital Innovation and Transformation2017Conference paper (Refereed)
  • 7161. Wißotzki, Matthias
    et al.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University, School of Engineering, JTH. Research area Computer Science and Informatics. Rostock University, Rostock, Germany.
    Smirnov, Alexander V.
    Kashevnik, Alexey
    Shilov, Nikolay
    Digital signage and targeted advertisement based on personal preferences and digital business models2017Conference paper (Refereed)
    Abstract [en]

    Digital signage in general refers to the provision of content (advertisements, news, assistance) on electronic scoreboards or large displays in places where many people are present or passing by. The more this content is expected to be tailored for specific user groups, the more context information is required, like, e.g., the preferences or profiles of target users or user groups. The ideal digital signage solution would be able to provide individualized content for the audience consuming the information at any time: if only one person is present, the content would be personalized for this person; if a group of persons is present the demand of all should be met. Based on a digital signage solution for elevator doors, the paper investigates the intersecting of preferences as a contribution to determine the most relevant content for a group of users. This intersection of preferences serves as a basis for new business models for interactive elevator digital signage. The main contributions of the paper are (1) an industrial case of digital business model innovation motivating contextual digital signage, (2) a technical approach for intersecting personal preferences, and (3) a methodical approach for digital business model innovation.

  • 7162. Wohed, P.
    et al.
    Andersson, Birger
    KTH, School of Information and Communication Technology (ICT), Computer and Systems Sciences, DSV.
    Meta-modelling as a means for improved communication and interoperability: The case of frisco2005Conference paper (Refereed)
    Abstract [en]

    Unclear and disparate terminology are causing problems in the area of information system development. To address these issues, modelling frameworks and ontologies based on solid philosophical and logical foundations have been developed. Hypothesizing that a diagrammatic interface will be beneficial for comprehension and communication resulting in wider dissemination, we propose a UML-based meta-model of one of those frameworks-Frisco. The analysis done during the development of the meta-model resulted in identification of a number of ambiguities in the framework. Discussion of these as well as suggestions of ways to solve them are also presented.

  • 7163. Wohed, P.
    et al.
    Andersson, Birger
    KTH, School of Information and Communication Technology (ICT), Computer and Systems Sciences, DSV.
    Reconciliation of two business modelling frameworks2005Conference paper (Refereed)
    Abstract [en]

    Addressed in this paper is the problem of conceptual heterogeneity within the field of information systems. Two frameworks, Frisco and Söderström, each reflecting this heterogeneity, are presented. They are analysed and an reconciliation attempt of them is provided. The reconciliation points at some strengths and weaknesses in each framework.

  • 7164.
    Wohed, Petia
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Truffet, David
    .., , .
    Juell-Skielse, Gustaf
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Business Process Management for Open E-services in Local Government - Experience Report2011Conference paper (Refereed)
  • 7165.
    Woldemariam, Yonas
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Sentiment Analysis in A Cross-Media Analysis Framework2016In: PROCEEDINGS OF 2016 IEEE INTERNATIONAL CONFERENCE ON BIG DATA ANALYSIS (ICBDA), 2016, p. 27-31Conference paper (Refereed)
    Abstract [en]

    This paper introduces the implementation and integration of a sentiment analysis pipeline into the ongoing open source cross-media analysis framework. The pipeline includes the following components; chat room cleaner, NLP and sentiment analyzer. Before the integration, we also compare two broad categories of sentiment analysis methods, namely lexicon-based and machine learning approaches. We mainly focus on finding out which method is appropriate to detect sentiments from forum discussion posts. In order to conduct our experiments, we use the apache-hadoop framework with its lexicon-based sentiment prediction algorithm and Stanford coreNLP library with the Recursive Neural Tensor Network (RNTN) model. The lexicon-based uses sentiment dictionary containing words annotated with sentiment labels and other basic lexical features, and the later one is trained on Sentiment Treebank with 215,154 phrases, labeled using Amazon Turk. Our overall performance evaluation shows that RNTN outperforms the lexicon-based by 9.88% accuracy on variable length positive, negative, and neutral comments. How-ever, the lexicon-based shows better performance on classifying positive comments. We also found out that the F1-score values of the Lexicon-based is greater by 0.16 from the RNTN.

  • 7166.
    Wooldridge, Paul
    Örebro University, Örebro University School of Business.
    Using Zachman´s Framework: Key Learning Points from applying an Enterprise Architecture to a real scenario2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 7167.
    Wortley, David
    et al.
    European Chapter of the International Society of Digital Medicine, Alderton, United Kingdom.
    An, Ji-Young
    Office of Public Health Studies, University of Hawaii, Honolulu, HI, United States.
    Heshmati, Almas
    Jönköping University, Jönköping International Business School, JIBS, Economics. Department of Economics, Sogang University, Seoul, Korea.
    Tackling the challenge of the aging society: Detecting and preventing cognitive and physical decline through games and consumer technologies2017In: Healthcare Informatics Research, ISSN 2093-3681, E-ISSN 2093-369X, Vol. 23, no 2, p. 87-93Article in journal (Refereed)
    Abstract [en]

    Objectives: This study seeks to review some of the approaches employed to address health and well-being issues in the elderly population.

    Methods: This article reviews and analyses a range of projects and approaches designed for the elderly population and aimed at preserving and/or enhancing physical and cognitive capabilities in later life.

    Results: Various intervention measures have been developed across the globe to preserve and/or enhance physical and cognitive capabilities of the elderly population. A selection of these measures is described in this article.

    Conclusions: Approaches which combine games psychology and mechanics with enabling technologies designed to engage, influence and motivate elderly people can encourage healthy active aging lifestyles. Healthy active aging helps to realise a double dividend of reduced healthcare costs and an improved quality of life for the elder citizen. 

  • 7168.
    Wredenberg, Daniel
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Bengtsson, Marcus
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Övergång till 24-timmarsmyndighet: vad krävs för att en kommun skall lyckas?2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    The overall purpose of e-Government is to improve the level of service given to the citi-zens. The society shall have the opportunity to make use of the governments’ whole range of services via the Internet. The development towards this goal has begun. In this paper we have chosen to investigate which factors that is of decisive matter, in order to make a municipality succeed in its development of becoming an e-Government.

    About 60 municipalities are today members of a cooperation named Sambruk. The pur-pose of this economic association is to create an opportunity for common development of e-services. Sambruk makes it possible for the municipalities to share development costs of new applications and to exchange knowledge and experiences with each other. Jönköping is a precursor in this project, which has made the municipality a leader within this area. We have therefore decided to conduct our study in Jönköping. The method that has been used is qualitative and contains of an observation and a deep-interview.

    Several factors has emerged that can be seen as significant in the transition of municipali-ties to become e-Governments. A higher authority that takes care of common problems regarding the development of e-services for municipalities needs to be created. It is also of great importance that all the municipalities and authorities reach a similar range of e-services. This due to that, less developed municipalities otherwise slows down those who are far ahead in their development. The legislation of personal integrity is another problem; it reduces which types of e-services that can be created. The legislation of official purchase is also a setback, due to that it reduces the number of actors taken into consideration when it comes to the acquisition of new e-services. This leads to unnecessary high costs. It is also common that the municipalities have insufficient competence when it comes to official purchase, which makes them dependent on consultants. This decreases their possibility of making demands on ordered e-services. The municipalities’ communication with their citizens is also important in the creation of new e-services, which shall be developed in order to fit their demands. Another common factor is that the municipalities see to short-term profits in the creation of new e-services, which complicates the development of a good IT-infrastructure.

    Statskontoret has developed a step-model that is supposed to guide the municipalities in their development of becoming e-Governments. It has during the thesis work come to light that the municipalities no longer consider it desirable to reach the highest step in this model, due to that it only shows how technically advanced an e-service is, not the benefit it creates. An e-service shall instead have the degree of complexity that maximizes the advantages for its coming users.

  • 7169.
    Wrigstad, Tobias
    KTH, School of Information and Communication Technology (ICT), Computer and Systems Sciences, DSV.
    Ownership-Based Alias Managemant2006Doctoral thesis, monograph (Other scientific)
    Abstract [en]

    Object-oriented programming relies on sharing and the mutable states of objects for common data structures, patterns and programming idioms. Sharing and mutable state is a powerful but dangerous combination. Uncontrolled aliasing risks causing representation exposure, where an object's state is exposed and modifiable out of the control of its conceptually owning object. This breaks encapsulation, and hence, in extension, abstraction.

    Contemporary object-oriented programming languages' support for alias encapsulation is mediocre and easily circumvented. To this end, several proposals have been put forward that strengthen encapsulation to enable construction of more reliable systems and formally reasoning about properties of programs. These systems are vastly superior to the constructs found in for example C++, Java or C#, but have yet to gain acceptance outside the research community.

    In this thesis, we present three constructs for alias management on top of a deep ownership types system in the context of the Joline programming language. Our constructs are fully statically checkable and impose little run-time overhead. We show the formal semantics and soundness proof for our constructs as well as their formal and informal aliasing properties. We show applications and extensions and perform a practical evaluation of our system with our implemented Joline compiler. The evaluation suggests that our constructs are compatible with real-world programming, makes use of some of our own proposed patterns, and encourages further practical studies of programming with ownership-based constructs for alias management.

  • 7170.
    Wu, Xue
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Can Google Earth enhance Business Intelligence?: Exploring innovative uses of a new GIS tool2007Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    We are facing a period that coming into information time, which forced us to live in a new living style. It seems that every business movement is related with information transformation. When computers are used to deal with business data, we begin to search a way to make digital data into refined format information in order to let people to understand. This change results in a changing of business forms. For example, e-services refer to provide a certain service or play function on line, which has the tendency to replace the place of traditional service. How this kind of service can be developed remains a question mark to us.

    The challenge of e-service is how to get different functions into integration. This thesis begins to research it focusing the point view of GIS (Geography Information System). Take Google earth as an example to illustrate how GIS is being used and what possible future uses of it can be developed. By exploring its use in data collecting, and analyzing, the possible applications in business world can be obviously released.

  • 7171. Wu, Z.
    et al.
    Cao, J.
    Mao, Bo
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Geoinformatics.
    Wang, Y.
    Semi-SAD: Applying semi-supervised learning to shilling attack detection2011In: RecSys - Proc. ACM Conf. Recomm. Syst., 2011, p. 289-292Conference paper (Refereed)
    Abstract [en]

    Collaborative filtering (CF) based recommender systems are vulnerable to shilling attacks. In some leading e-commerce sites, there exists a large number of unlabeled users, and it is expensive to obtain their identities. Existing research efforts on shilling attack detection fail to exploit these unlabeled users. In this article, Semi-SAD, a new semi-supervised learning based shilling attack detection algorithm is proposed. Semi-SAD is trained with the labeled and unlabeled user profiles using the combination of naïve Bayes classifier and EM-λ, augmented Expectation Maximization (EM). Experiments on MovieLens datasets show that our proposed Semi-SAD is efficient and effective.

  • 7172.
    Wästlund, Erik
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Psychology. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Service Research Center.
    Fischer-Hübner, Simone
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    The Users' Mental Models' Effect on their Comprehension of Anonymous Credentials2011In: Privacy and Identity Management for Life / [ed] Camenisch, J.; Fischer-Hübner, S.; Rannenberg, K., Heidelberg: Springer , 2011, p. 233-244Chapter in book (Other academic)
    Abstract [en]

    Anonymous Credentials are a key technology for enforcing data minimisation for online applications. The design of easily understandable user interfaces for the use of anonymous credentials is however a major challenge, as end users are not yet familiar with this rather new and complex technology and no obvious real-world analogies exist for them. In this chapter, we analyse what effects the users’ mental models have on their understanding of the data minimization property of anonymous credentials in the context of an e-Shopping application scenario. In particular, we have investigated the effects of the mental models of a card-based user interface approach and an attribute-based user interface approach and compared these in terms of errors of omission and addition. The results show that the card-based approach leads to significantly more errors of addition (i.e., users believe that they have disclosed more information than they actually have) whereas the attribute-based approach leads to more errors of omission (i.e., users underestimate the amount of data that they have disclosed).

  • 7173.
    Wästlund, Erik
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Psychology. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Service Research Center.
    Wolkerstorfer, Peter
    Austria.
    PET-USES2011In: Privacy and Identity Management for Life / [ed] Camenisch, Fischer-Hübner, Rannenberg, Heidelberg: Springer Berlin/Heidelberg, 2011Chapter in book (Other academic)
  • 7174. Wäyrynen, Jaana
    et al.
    Bodén, Marine
    Boström, Gustav
    KTH, Superseded Departments, Computer and Systems Sciences, DSV.
    Security engineering and eXtreme programming: An impossible marriage?2004In: EXTREME PROGRAMMING AND AGILE METHODS - XP/ AGILE UNIVERSE 2004, PROCEEDINGS / [ed] Zannier C, Erdogmus H, Lindstrom L, Berlin: Springer , 2004, p. 117-128Conference paper (Refereed)
    Abstract [en]

    Agile methods, such as eXtreme Programming (XP), have been criticised for being inadequate for the development of secure software. In this paper, we analyse XP from a security engineering standpoint, to assess to what extent the method can be used for development of security critical software. This is done by analysing XP in the light of two security engineering standards; the Systems Security Engineering-Capability Maturity Model (SSE-CMM) and the Common Criteria (CC). The result is that XP is more aligned with security engineering than one might think at first. However, XP also needs to be tailored to better support and to more explicitly deal with security engineering issues. Tailoring XP for secure software development, without removing the agility that is the trademark of agile methods, may be a solution that would make XP more compatible with current security engineering practices.

  • 7175.
    Wåhlgren, Yvonne
    University of Skövde, Department of Computer Science.
    Hur beräknas den ekonomiska avkastningen för en datalagerinvestering?2002Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Syfte med detta arbete är att undersöka huruvida avkastningsberäkning för en datalagerinvestering bör göras, hur det kan göras och om det görs. Vidare avses att undersöka om generella kalkylmetoder kan användas av företag, oavsett storlek, som avser att starta datalagerinvesteringsprojekt. Datalagerteknologin har ännu en hög utvecklingstakt och detta medför ofta höga utvecklingskostnader i samband med investeringar inom datalager.

    Undersökningen baseras på en kombinerad dokumentstudie och enkätundersökning. Dokumentstudien belyser den problematik vilken förknippas med problemområdet. Enkätundersökningen fokuseras mot olika större organisationer såsom banker, post och dagligvaruhandeln, vilka idag använder sig av datalager. De tillfrågas om huruvida avkastningsberäkning görs i deras organisation och, i så fall, hur den utförs.

    Analysen och resultatet tyder på att problemområdet inte har en enkel lösning och att någon typ av avkastningsberäkning bör användas. Svårigheterna ligger i att värdera de potentiella fördelar som ett datalager kan generera.

  • 7176.
    Wåhlén, Herje
    Umeå University, Faculty of Social Sciences, Department of Informatics.
    Voice Assisted Visual Search2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The amount and variety of visual information presented on electronic displays is ever-increasing. Finding and acquiring relevant information in the most effective manner possible is of course desirable. While there are advantages to presenting a large number of information objects on a screen at the same time, it can also hinder fast detection of objects of interest. One way of addressing that problem is Voice Assisted Visual Search (VAVS). A user supported by VAVS calls out an object of interest and is immediately guided to the object by a highlighting cue. This thesis is an initial study of the VAVS user interface technique. The findings suggest that VAVS is a promising approach, supported by theory and practice. A working prototype shows that locating objects of interest can be sped up significantly, requiring only half the amount of time taken without the use of VAVS, on average.

  • 7177. Xia, Ruixue
    et al.
    Rost, Mattias
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Holmquist, Lars Erik
    Business Models in the Mobile Ecosystem2010In: ICMB/GMR 2010, IEEE Computer Society , 2010Conference paper (Other academic)
  • 7178.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kanter, Theo
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahmani, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    An Ontology-based Problem-logic Driven Approach towards the Activity Awareness for Elderly Care2015In: International Journal of Multimedia and Ubiquitous Engineering, ISSN 1975-0080, Vol. 10, no 4, p. 31-42Article in journal (Refereed)
    Abstract [en]

    The same activity under different user situations in the elderly care system may lead to different intelligent system response, since user needs vary with the changing situations. Activity awareness (AA) emphasizes that systems intelligently respond to user needs by aware the user-performed activities which is denoted and comprehended according to various user situations. But most current AA technics use similar patterns retrieved from the growing historical data, neglecting the situation change, called dataset driven. Thus, an aptly approach is needed in support of AA systems to handle various activity denotations in different user situations. Responding to the problem, this paper proposes an Ontology-based Problem-logic driven approach (OPL) to enhance the AA system by denoting user activities with the problem logic according to user-oriented denoted problem domains, where the AA system can seamlessly integrate with inferring for intelligent system response. Specifically, denoted problem domain and logic are proposed to support the OPL concepts, while activity graph is formed to support the intelligent system response based on the annotated problem logic. With the OPL, systems can directly target at the changing situations with rule-based inferring. A case study is performed upon the scenario retrieved from a European elderly care project, where a proof-of-concept prototype is established to confirm the validity of the OPL approach.

  • 7179.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kanter, Theo
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahmani, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Constructing Context-centric Data Objects to Enhance Logical Associations for IoT Entities2015In: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 52, p. 1095-1100Article in journal (Refereed)
    Abstract [en]

    Entities in Internet of Things (IoT) need intelligent associations to allow a flexible and dynamic system reaction towards varying user situations. Purely data-oriented association methods (e.g., data-mining, machine-learning, etc.) are limited in deduction from existing associations. Also such data-oriented methods are limited in accuracy for working with small-scale datasets (e.g., working with patterns retrieved from historical data), outputting associations based on statistics rather than logic. Moreover, existing semantic technologies (ontological-oriented or rule-oriented) are facing with either flexibility or dynamicity challenges to discover and maintain the associations. This paper proposes an alternative technique of semantically constructing context-centric data objects based on service logics for logical associations, which enables an event net based on association nets adapting for the changing situations (called context-centric). A proof-of-concept implementation is carried out based on a vehicle planning scenario to validate the data construction technique. Comparing to previous work, this technique possesses advantages of flexibility and dynamicity for entity associations based on service logics.

  • 7180.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kanter, Theo
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahmani, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Generic Distributed Sensing in Support of Context Awareness in Ambient Assisted Living2014In: Multimedia and Ubiquitous Engineering / [ed] Park, J. J.; Chen, S. C.; Gil, J. M.; Yen, N. Y., Springer Berlin/Heidelberg, 2014, p. 99-107Conference paper (Refereed)
    Abstract [en]

    Researches in ambient assisted living have so far faced three important challenges: (1) Lack of a comprehensive approach to capture user needs that are generic; i.e., not limited to specific events, but as generic related to the user. (2) Lack of a highly flexible and scalable platform for the distributed sharing and processing of context between nodes in IoT networks. (3) Increased amount of communication and devices with sensors participating in the acquisition, processing and sharing of context further challenges both computation capability and storage capacity of the system. In this paper, we address these limitations and present novel support, applied in a system for remote assistance of elderly. The support comprehensively retrieves user needs from generic context, via a scalable overlay providing increment of processing capability and storage. Further, the support self-organizes entities into generic context from distributed sensing, using the Dependent Context Pattern (DCP) based on the Context Virtualizing Platform (CVP).

  • 7181.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kanter, Theo
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahmani, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Logical interactions for heterogeneous IoT entities via virtual world mirrors in support of Ambient Assisted Living2016In: Journal of Ambient Intelligence and Smart Environments, ISSN 1876-1364, E-ISSN 1876-1372, Vol. 8, no 5, p. 565-580Article in journal (Refereed)
    Abstract [en]

    In Ambient Assisted Living (AAL), as an important applied area of Internet of Things (IoT) technology, logical entity interaction establishes an intelligent virtual world in which heterogeneous entities are emulated by object-oriented mirrors through tightly cooperating sensors and actuators from different spaces in the real world; this enables the system to generate intelligent services to support human behaviour. However, until now, few researchers have focused on enabling interactions between heterogeneous IoT entities for AAL services. Further, in relevant studies regarding semantic entity interactions, researchers have mainly focused on enabling semantic interactions between sensors (rather than integral entities) for the purpose of coordinating and managing data resources, where tight collaborations between sensors and actuators are not emphasised. Hence, the system capability of initialising intelligent service to enhance human experience has not been properly emphasised, to date. This paper discusses enabling logical object-oriented IoT entity interactions to enrich AAL services for humans through the creation of mirrors in the virtual world emulating the attributes and behaviours of heterogeneous entities via cooperating sensors and actuators in the real world. This paper introduces the Entity Device Collocating (EDC) Platform to globally locate and retrieve sensors and actuators respectively adhering to the attributes and behaviours of integral mirrors in the virtual world; this is intended to enable the interoperability between virtual and real worlds. Interactions are created upon entity mirrors mapping entities from the physical world to the virtual world, during which interactions continue to evolve based on the service logics. The proposed technique is applied to a typical AAL case of smart pill-ingestion, where a demo is implemented for verification. Comparing with relevant research, the proposed technique contributes by introducing a flexible and scalable IoT entity interaction method targeting AAL to address human needs.

  • 7182.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahim, Rahmani
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    A Deep Relation Learning Method for IoT Interoperability Enhancement within Semantic Formalization Framework2016Conference paper (Refereed)
  • 7183.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahmani Chianeh, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    A deep Relation learning method for IoT Interoperability enhancement within Semantic formalization framework2017In: International Conference on Internet of Things, Data and Cloud Computing, ACM Publications , 2017Conference paper (Refereed)
  • 7184.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahmani, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Li, Yuhong
    Gillblad, Daniel
    Kanter, Theo
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Intelligent Data-Intensive IoT: A Survey2016In: 2016 2nd IEEE International Conference on Computer and Communications (ICCC): Proceedings, IEEE Computer Society, 2016, p. 2362-2368Conference paper (Refereed)
    Abstract [en]

    The IoT paradigm proposes to connect entities intelligently with massive heterogeneous nature, which forms an ocean of devices and data whose complexity and volume are incremental with time. Different from the general big data or IoT, the data-intensive feature of IoT introduces several specific challenges, such as circumstance dynamicity and uncertainties. Hence,intelligence techniques are needed in solving the problems brought by the data intensity. Until recent, there are many different views to handle IoT data and different intelligence enablers for IoT, with different contributions and different targets. However, there are still some issues have not been considered. This paper will provide a fresh survey study on the data-intensive IoT issue. Besides that, we conclude some shadow issues that have not been emphasized, which are interesting for the future. We propose also an extended big data model for intelligent data-intensive IoT to tackle the challenges.

  • 7185.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Zeeshan Asghar, Muhammad
    university of Oulu, faculty of science , department of information processing science .
    Jämsä, Tapani
    university of Oulu , faculty of science , department of information processing science.
    Pulli, Petri
    university of Oulu, faculty of science , department of information processing science.
    “Canderoid”: A mobile system to remotely monitor travelling status of the elderly with dementia2013In: International Joint Conference on Awareness Science and Technology and Ubi-Media Computing (iCAST-UMEDIA), 2013, IEEE Press , 2013, p. 648-654Conference paper (Refereed)
    Abstract [en]

    The number of elderly people increases quickly in many countries, under the global population aging situation. It is an upsetting fact that many elderly people are suffering from the dementia, which seriously obstructs their independent living and travel. It is a pervasive problem that the demented elderly individuals are easy to get lost or go into danger during alone travel in daily life. Therefore we propose a novel mobile system named “Canderoid” to monitor independent outdoor travel of the elderly individuals remotely, with aid from the caretaker. The system is composed mainly of an android terminal (Wanderoid), an MQTT broker, and a platform on caretaker side. In the system, an android terminal named “Wanderoid” is implemented on a smartphone to capture the travelling status, using built-in smartphone sensors (i.e. camera with an adhesive fish-eye lens, compass and GPS). The terminal device is a normal smartphone, with a fish-eye lens attached on the camera. The sensor data are transferred to the platform of caretaker after capturing. The data transmission work relies on a message pushing architecture, which deals with mobile IP address changing and enables remote manipulation of the smartphone terminal, by introducing the MQTT broker. Then the caretaker platform can interpret sensor data and real-timely present the travelling status using snapshot taken by the fish-eye camera, street view and map. A reliability test, energy dissipation test and usability test are carried out on the prototype to verify that the system is effective, easy-to-use, reliable and energy-saving, from the viewpoints of both technology and human factors.

  • 7186. Xiao, Jun
    et al.
    Xu, Zhen
    Yu, Ye
    Cai, Shuo
    Hansen, Preben
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    The Design of Augmented Reality-Based Learning System Applied in U-Learning Environment2016In: E-Learning and Games: 10th International Conference, Edutainment 2016, Hangzhou, China, April 14-16, 2016, Revised Selected Papers / [ed] Abdennour El Rhalibi, Feng Tian, Zhigeng Pan, Baoquan Liu, Springer, 2016, p. 27-36Conference paper (Refereed)
    Abstract [en]

    The easy and widely accessibility of Internet resources makes it possible to support learning almost anywhere at any time through powerful mobile technologies, and facilitate ubiquitous learning (u-learning) to grow in use and popularity. Augmented Reality (AR) can be recognized as a key technology that can be used in the U-learning environment to increase learning effect and improve learning experience. This paper designs an integrated model of U-learning, based on which we have also developed an augmented reality technology based learning system named as “Starry Sky Exploration—Eight Planets of Solar System”; an analysis on its implementation is reported and the AR learning system applicable for U-learning environment is found effective and practical.

  • 7187.
    Xiao, Ming
    et al.
    KTH, School of Electrical Engineering (EES), Communication Theory.
    Aulin, Tor M.
    A physical layer aspect of network coding with statistically independent noisy channels2006In: 2006 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-12, 2006, Vol. 9, p. 3996-4001Conference paper (Refereed)
    Abstract [en]

    We investigate the physical layer bit error probability (BEP) of a network using network coding (coded network). The network consists of statistically independent noisy channels. Thus, transmitted bits are subject to the noise disturbance. An error marking algorithm is given to calculate the error weight (the number of erroneous bits) in the sinks. Then we can calculate the sink BEP of a coded network from the channel BEPs. We formulate the minimizing BEP problem. We show that coding schemes with the same flow may have different sink BEPs. Two approaches are suggested to reduce the complexity.

  • 7188.
    Xie, Yun
    et al.
    Örebro University, Örebro University School of Business.
    Wang, Hao
    Örebro University, Örebro University School of Business.
    Utilization of M-Government Service in Rural China2012Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Electronic government (e-government) has developed rapidly, the Mobile Government service (m-government) as one of the import branches play a significant role in recent years, and it would be also an effective way to satisfy Chinese rural citizen’s information needs. Our research question is how the m-government service satisfies Chinese rural citizen’s information needs. The investigation is conducted with questionnaires in a rural town where in Guangdong Province. We find that the most needed information perceived or expresses by rural citizen are closely related to their basic survival. There is a big potential to develop m-government service in rural areas since most of rural citizen haven’t paid attention on it. Last we put forward some suggestions for improving m-government services for Chinese rural citizen.

  • 7189.
    Xoljé, Rebecca
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School.
    Innovation inom outsourcing av IT: En kvalitativ studie utifrån leverantörens möjligheter att bidra2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    IT-branschen är en av de marknader som konstant växer och krav på nya uppfinningar och innovationer är höga. Outsourcing har under en längre tid används av IT-företag för att kunna reducera kostnader för produktion och utveckling. Outsourcing är även ett bra alternativ för att erhålla expertis inom ett visst område där företag saknar erfarenhet eller resurser. Innovation är en del av företags utveckling och när hela eller delar av företagens IT-avdelningar blir outsourcade är det naturligt att även tillhörande delar av innovationsprocessen har förflyttats. Leverantören är den part som i praktiken utvecklar innovationen i outsourcingavtalet. Leverantörerna får en strikt budget och tidsram från kunden att följa för varje projekt. Innovation är kreativt, föränderligt och levande. Dessutom är innovation dyrt. Helt motsägelsefullt mot outsourcing. Leverantörer har en svår uppgift i att arbeta utifrån kundens krav och samtidigt försöka realisera innovationer. Syftet med studien är att undersöka på vilket sätt leverantörer bidrar med innovation inom outsourcing av IT.Studien har utförts med en kvalitativ fallstudiemetod. Intervjuer har genomförts med fyra olika respondenter på ett stort IT-företag som nästan helt uteslutande arbetar med outsourcing. Den största nackdelen med outsourcing är de stora kraven på kostnadsbesparing, den har en negativ inverkan på innovationen. Alla respondenter har uttryckt att de som leverantör har möjlighet att bidra med innovation men att kostnadsbesparingarna kan göra utrymmet för innovation begränsat i vissa fall. Övergången till det agila arbetssättet har hjälpt till att främja innovationsförmågan hos leverantören.

  • 7190.
    Xu, Chenfan
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Impact of a Decision Support System on Obstetricians in the Pregnancy Nutrition Guidance2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background: Pregnancy Nutrition (PN) guidance is an issue of great concern worldwide because of its direct relevance to the maternal healthcare and the healthy prenatal development (Li et al., 2004, p. 11). Providing an effective guidance on PN is an onerous and time-consuming task. Extensive experience, knowledge, and continuous and actual calculations are required for the obstetricians. Consequently, the PN guidance is often faced with difficulties and hurdles. It is, however, dramatically changed with the emergence of a Decision Support System (DSS) for PN guidance based on the computer information management technique. This DSS has been applied for the clinic guidance of PN in obstetrics departments or hospitals in China. Its impacts on obstetricians are investigated in this thesis.

    Objectives: This thesis investigates the consequences and intrinsic correlations of relevant factors during the application of the DSS, so that its effects on obstetricians can be clearly identified and the usefulness of this system for pregnancy nutrition guidance can be effectively established. It also lays a foundation for an effective communication between system developers and the end users of this system. At the meantime, this work proposes the concepts and methods that allow proper utility of such an information management system.

    Methods: A number of research methods have been applied for data acquisitions and analyses, including direct observations of the obstetrics department in the hospital in study, conversational interviews with the participating obstetricians, and distance communications. These approaches enable us to prepare the resources to construct the model based on these case studies. As a parallel approach, quantitative methods based on questionnaires have been conducted which reach out a large number of obstetricians in different locations. This allows a statistical analysis that permits the impact analysis and correlation of the intrinsic factors, so that the conclusions of this study can be consolidated.

    Results: Positive impacts will be measured by five factors including convenience, acceptability, generality, concreteness, and effectiveness, while negative impacts by three factors including verbosity, rigidity, and expensiveness.

    Conclusions: The DSS has successfully enhanced the application of correct PN guidance. Both positive and negative impacts have been generated on obstetricians by the DSS. These impacts are mainly related to the seniority of obstetricians and their familiarity with the PN guidance and the DSS. The development, utilization, and operation management of the DSS in PN guidance has generated impacts and functions. This study might provide resources and foundation of the systematic management of the DSS together with its development. The DSS and the related Chief Information Officers and Specialists will benefit from this study and therefore provide improved support and assistance for the end users to complete information system management successfully.

  • 7191. Xu, Luzhou
    et al.
    Stoica, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Li, Jian
    A block-diagonal growth curve model2006In: Digital signal processing (Print), ISSN 1051-2004, E-ISSN 1095-4333, Vol. 16, no 6, p. 902-912Article in journal (Refereed)
    Abstract [en]

    We consider a variation of the growth curve (GC) model, referred to as the block-diagonal growth curve (BDGC) model, where the unknown regression coefficient matrix is constrained to be block-diagonal. A closed-form approximate maximum likelihood (AML) estimator for this model is derived based on the maximum likelihood principle. We analyze the statistical properties of this method theoretically and show that the AML estimate is unbiased and asymptotically statistically efficient for a large snapshot number. Via numerical examples in wireless communications, we also show that the proposed AML estimator can achieve excellent estimation accuracy.

  • 7192.
    XUE, RUI
    Blekinge Institute of Technology, School of Computing.
    Human Computer Interaction Study: Designing a Mobile Web-based Vaccination Service System Interface for Uganda in Low Resource Settings2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Recently, the coverage rating of child vaccination services in developing countries, like Uganda, is lower than developed countries. The low resource setting is the reason that causes the poor vaccination performance. Health workers suffer from the heavy workload, low budget supplement and bad traffic condition, etc. Which constrains the quality of vaccination services. In this thesis, the author designs a mobile web-based vaccination service system, to improve the quality of vaccination service, within the low resource setting. A study in HCI is carried out to design a vaccination service system in the low resource settings of Uganda. Through theoretical study, the author collects the knowledge about how to apply HCI theory to system interface design. A related work study is carried out to help the author to choose the design solution. Through comparing the design with related works, the strength of using the author’s design solution in low resource of Uganda is verified. A field study helps to collect information about the user’s characteristics, which is used for designing a user-friendly system interface. An internal focus group helps to improve the design quality. The author delivers a case study example which could be evaluated and borrowed by other researchers who design a similar system. Additionally, findings from the qualitative research could be used for further research.

  • 7193. Xylia, Maria
    et al.
    Ibrahim, Osama
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Silveira, Semida
    Fossil-free Public Transport: Prescriptive Policy Analysis for the Swedish Bus Fleets2016In: 2016 13th International Conference on the European Energy Market (EEM), IEEE Computer Society, 2016Conference paper (Refereed)
    Abstract [en]

    Elicitation and processing of the relevant information is the core of any policy decision-making process. This study presents a prescriptive policy analysis for the “fossil-free fuel deployment for public transport buses at the national level in Sweden”, using a policy-oriented modelling and simulation tool, Sense4us , that supports systems analysis for policy involving:: (i) Structuring of policy problems using the labelled causal mapping method [11], (ii) Ex ante Impact assessment using scenario-based dynamic simulation modelling and (iii) Ex-ante evaluation of the considered policy options based on the simulation results and using a set of standard criteria for evaluation of EU policy interventions. The results are most of all useful for designing a policy pathway for public bus transport that is both environmentally sustainable and economically feasible. Moreover, the process allows involvement of the key stakeholders to reflect various priorities and preferences.

  • 7194. Yan, Su-Rong
    et al.
    Zheng, Xiao-Lin
    Wang, Yan
    Song, William Wei
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Zhang, Wen-Yu
    A graph-based comprehensive reputation model: exploiting the social context of opinions to enhance trust in social commerce2015In: Information Sciences, ISSN 0020-0255, E-ISSN 1872-6291, Vol. 318, p. 51-72Article in journal (Refereed)
    Abstract [en]

    Social commerce is a promising new paradigm of e-commerce. Given the open and dynamic nature of social media infrastructure, the governance structures of social commerce are usually realized through reputation mechanisms. However, the existing approaches to the prediction of trust in future interactions are based on personal observations and/or publicly shared information in social commerce application. As a result, the indications are unreliable and biased because of limited first-hand information and stake-holder manipulation for personal strategic interests. Methods that extract trust values from social links among users can improve the performance of reputation mechanisms. Nonetheless, these links may not always be available and are typically sparse in social commerce, especially for new users. Thus, this study proposes a new graph-based comprehensive reputation model to build trust by fully exploiting the social context of opinions based on the activities and relationship networks of opinion contributors. The proposed model incorporates the behavioral activities and social relationship reputations of users to combat the scarcity of first-hand information and identifies a set of critical trust factors to mitigate the subjectivity of opinions and the dynamics of behaviors. Furthermore, we enhance the model by developing a novel deception filtering approach to discard "bad-mouthing" opinions and by exploiting a personalized direct distrust (risk) metric to identify malicious providers. Experimental results show that the proposed reputation model can outperform other trust and reputation models in most cases. (C) 2014 Elsevier Inc. All rights reserved.

  • 7195.
    Yang, Binbin
    et al.
    Umeå University, Faculty of Social Sciences, Department of Informatics.
    Zisiadis, Miltiadis
    Umeå University, Faculty of Social Sciences, Department of Informatics.
    Transmedia marketing: strengthening multiplatform user participation through storytelling2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The term transmedia storytelling describes an interactive narrative that exists in multiple platforms. This phenomenon allows active audience participation as a part of the narrative creation process. Part of the prior research on transmedia focuses on how to create a transmedia narrative. However there is a dearth of literature examining the merit that transmedia narratives create in Marketing. In order to answer the research question “How can transmedia storytelling be used to create value in marketing?” we conducted a multiple case study research in which we examined four marketing campaigns to reveal the transmedia elements in them. Using the approach of qualitative content analysis we applied a structured method according which we collected and ­­analysed the data from these campaigns. Our findings suggest that creating audience participation through transmedia storytelling in marketing campaigns for movies, products and services can be beneficial. By using different media, platforms and stimulating user participation, concepts such as brand extension and brand awareness are introduced to the audience with an alternative way. The aim of this thesis is to illustrate several ways of how transmedia can be a valuable asset to a marketing campaign through storytelling.

  • 7196.
    Yang, Dingjie
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    The Network Lens2010Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    A complex network graphics may be composed of hundreds and thousands of objects, such as nodes and edges. Each object may hold a large number of attributes that might be difficult to explore in the network visualization. Therefore, many visualization tools and approaches have been developed to gain more information from the network graphics. In this paper, we introduce the concept of the Network Lens, a new widget that assists the users to deal with a complex network. The Network Lens is an interactive tool that combines data visualization to a magic lens. With the help of the Network Lens, users can display hidden information of the elements in the network graphics based on their interest. Moreover, the Network Lens supports a series of interactive functions that give the users flexible options to define their own lenses.

  • 7197. Yang, Guo-liang
    et al.
    Ahlgren, Per
    Department for Library services, Language and ARC, KTH, School of Education and Communication in Engineering Science (ECE), Library, Publication Infrastructure.
    Yang, Li-ying
    Rousseau, Ronald
    Ding, Jie-lan
    Grading Countries/Territories Using DEA Frontiers2015In: PROCEEDINGS OF ISSI 2015 ISTANBUL: 15TH INTERNATIONAL SOCIETY OF SCIENTOMETRICS AND INFORMETRICS CONFERENCE, Leuven University Press, 2015, p. 436-447Conference paper (Refereed)
    Abstract [en]

    Several approaches exist related to categorizing academic journals/institutions/countries into different levels. Most existing grading methods use either a weighted sum of quantitative indicators (including the case of one properly defined quantitative indicator) or quantified peer review results. An important issue of concern for science and technology management is the efficiency of resource utilization. In this paper we deal with this issue and use multi-level frontiers of data envelopment analysis (DEA) models to grade countries/territories. Research funding and numbers of researchers as used as inputs, while papers and citations are output variables. The research results show that using DEA frontiers we can grade countries/territories on six levels. These levels reflect the corresponding countries' level of efficiency in S&T resource utilization. Furthermore, we use papers and citations as single outputs (with research funding and researchers as inputs) to show changes in country/territory level.

  • 7198.
    Yang, Mengting
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Zhang, Fan
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Development of an Electronic Business Card system - The Meetia system2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    First and foremost, we would like to thank to our supervisor Wagner Ourique de Moraisfor his valuable guidance and suggestions during the whole time of the thesis work. Hemotivated us contributed to our project and inspired us greatly.Furthermore, we would like to thank Anders Nilsson and Henrik Abrahamsson who arebusiness students at Halmstad University for the project idea. They gave us an opportunity toparticipate and learn from each other.Finally, we would like to thank you our friends for helping us this project.

  • 7199.
    Yang, Xuan
    et al.
    School of Business Administration, Zhongnan University of Economics and Law, China.
    Gao, Shang
    Örebro University, Örebro University School of Business.
    Understanding the Values of Live Game Streaming: a Value-Focused Thinking Approach2017In: WHICEB 2017: Proceedings, Association for Information Systems, 2017, p. 394-401Conference paper (Refereed)
    Abstract [en]

    Today, along with the development of information communication technology, live streaming is getting more and more popular in China. It has established an integrated industrial chain. There are a large number of users watching different live streams (e.g., games. sports, live shows) through personal computers and mobile devices. In this paper, we aim to investigate the values of live game streaming using the Value-Focused Thinking (VFT) approach. We analyze the values of live game streaming from the perspectives of both streamers and spectators. The identified values are represented in the form of a means-ends objective network. The means-ends objective network derived from this research can serve as a conceptual foundation for future studies and provide useful guidelines for practitioners to better operate live game streaming applications.

  • 7200.
    YARGOVAN, SERTAN
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Transformation of administration into e-government: From municipality to e-municipality in İstanbul Metropolitan Municipality in Turkey2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today, citizens are government-related jobs, more quickly and are being carried out in a systematic way of e-government, began to implement a rebuke to all the countries of the world. According to the level of development of countries, this transition moving forward fast or slow.

    To create the infrastructure of e-government, huge investments need to be made financially. For this reason, e-government applications in each country with the same speed and the same advanced infrastructure take place.

    E-government, E-municipality in itself e-finance and so on divided into subtypes. In this species, e-municipalities have an important place. Municipalities with the basic element of urban life, is extremely important to provide services in the form of e-government. Transparency is fundamental to increasing confidence in the local government and citizen-municipal applications, and the city moving forward on more regular jobs.

    Turkey is a country that has the category of developing countries. The transition to e-government applications is still in the country, are carried out for E-municipal applications. Country, city divided into units called local government services is realized. Municipalities and cities with population over a certain number of other provinces administered in the form of the Municipality. Municipalities depend on the central government.

    Istanbul is the most populous province in Turkey.  For this reason, many municipalities in the country to the other applications that are running in this city are a pioneer. E-municipality application is one of the applications of this type. Istanbul Metropolitan Municipality, e-municipal applications continues to transition. It has continued to work on infrastructure and related units. A portion of the system works. E- Municipalities applications Istanbul's city hall, the municipal authorities, as well as their approach citizens wary of e-municipality system. However, many began to carry out transactions in the virtual environment.

141142143144145146147 7151 - 7200 of 7429
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf