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  • 451.
    Agelis, Sacki
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Optoelectronic router with a reconfigurable shuffle network based on micro-optoelectromechanical systems2004Ingår i: Journal of Optical Networking, ISSN 1536-5379, Vol. 4, nr 1, s. 1-10Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An optoelectronic router with a shuffle exchange network is presented and enhanced by the addition of micro-optoelectromechanical systems (MOEMS) in the network to add the ability to reconfigure the shuffle network. The MOEMS described here are fully connected any-to-any crossbar switches. The added reconfigurability provides the opportunity to adapt the system to different common application characteristics. Two representative application models are described: The first has symmetric properties, and the second has asymmetric properties. The router system is simulated with the specified applications and an analysis of the results is carried out. By use of MOEMS in the optical network, and thus reconfigurability, greater than 50% increased throughput performance and decreased average packet delay are obtained for the given application. Network congestion is avoided throughout the system if reconfigurability is used.

  • 452.
    Agelis, Sacki
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Optoelectronic router with MOEMS–based reconfigurable shuffle network2004Konferensbidrag (Refereegranskat)
  • 453.
    Agerblad, Josefin
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC).
    Andersen, Martin
    KTH, Skolan för datavetenskap och kommunikation (CSC).
    Provably Secure Pseudo-Random Generators 2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Den här rapporten är en litteraturstudie om bevisbart säkra pseudo-slumpmässiga generatorer. I rapporten förklarar vi vad bevisbart säkra pseudo-slumpmässiga generatorer är och vad de vanligtvis används till. Vi tar dessutom upp envägsfunktioner som är starkt kopplat till vårt ämne. Vidare beskrivs och jämförs två kända sådana generatorer, en generator av Blum och Micali och en generator av Blum, Blum och Shub. Den slutsats som vi kommit fram till är att x

    2 mod N generatorn av Blum, Blum och Shub verkar vara den bättre utav dem vad gäller hastighet, säkerhet och applikationsområden. Ni kommer även kunna läsa om hur en sådan generator kan implementeras och vi förklarar varför den presenterade koden är bra.

  • 454.
    Agevik, Niklas
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Shared UMTS Networks - A Techno-Economic Study on Mobile Network Operators’ Possibilities to Deliver Unique Products and Services2005Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Historically, there has been a one-to-one mapping between a mobile network and the reseller of the network’s services. Recent developments challenge this model. Virtual operators have emerged in GSM networks and during the rollout of UMTS networks, many operators built shared UMTS networks. This study analyses the impact of shared networks on the mobile network operators’ abilities to deliver unique products and services to their customers. Four sharing models that are in use today are analysed and presented in detail. These are site sharing, geographical split networks, shared RAN and spectrum sharing.

    The research in this study has been done in two steps. In the first step, possible differentiation opportunities are identified through literature studies and interviews with key persons at network operators, equipment manufacturers, business analysts and the Swedish national post and telecom agency. In the second step, this study compares the implementation of these opportunities in the four forms of shared networks with their implementations in a wholly owned network. The opportunities are grouped in three categories: products, quality of service differentiation and multiaccess networks.

    By setting quality of service attributes on bearers, such as latency and the attention/retention policy, quality of service differentiation is a possibility in common shared networks and geographical split networks. Although unlicensed access technologies, such as WLAN standards, can provide coverage differentiation in one sense, this study shows that this is not economical compared to UMTS pico-cells.

    The study finds that implementing features in the underlying network requires extensive cooperation between operators in all sharing models except for site sharing. Certain services require quality of service parameters that are mutually exclusive without over-provisioning in terms of network resources. Such parameters include for example latency and capacity. Even though the 3GPP UMTS standard allow for a separation of the service creation layer and the underlying network, this study argues that many services will still be dependent upon network features, thus mitigating the advantage of developing services in the unshared domain.

  • 455.
    Aggestam, Lena
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    IT-supported Knowledge Repositories for Sharing Best Practices: Getting Dressed for Success2007Ingår i: International Technology, Education and Development Conference (INTED 2007), International Association for Technology, Education and Development, 2007Konferensbidrag (Refereegranskat)
  • 456.
    Aggestam, Lena
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    IT-supported Knowledge Repositories: Increasing their Usefulness by Supporting Knowledge Capture2008Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Organizations use various resources to achieve business objectives, and for financial gain. In modern business, knowledge is a critical resource, and organizations cannot afford not to manage it. Knowledge Management (KM) aims to support learning and to create value for the organization. Based on three levels of inquiry (why, what, how), work presented in this thesis includes a synthesized view of the existing body of knowledge concerning KM and hence a holistic characterization of KM. This characterization reveals a strong dependency between KM and Learning Organization (LO). Neither of them can be successful without the other. We show that a KM project resulting in an IT-supported knowledge repository is a suitable way to start when the intention is to initiate KM work. Thus, our research focuses on ITsupported knowledge repositories.

    Large numbers of KM projects fail, and organizations lack support for their KM undertakings. These are the main problems that our research addresses. In order for an IT-supported knowledge repository to be successful, it must be used. Thus, the content of the repository is critical for success. Our work reveals that the process of capturing new knowledge is critical if the knowledge repository is to include relevant and updated knowledge. With the purpose of supporting the capture process, this thesis provides a detailed characterization of the capture process as well as guidance aiming to facilitate the implementation of the capture process in such a way that knowledge is continuously captured, also after the KM implementation project is completed. We argue that the continuous capture of new knowledge which can potentially be stored in the knowledge repository will, in the long term perspective, have a positive influence on the usefulness of the repository. This will most likely increase the number of users of the repository and accordingly increase the number of successful KM projects.

    All the work presented in this thesis is the result of a qualitative research process comprising a literature review and an empirical study that were carried out in parallel. The empirical study is a case study inspired by action research, which involved participation in the project Efficient Knowledge Management and Learning in Knowledge Intensive Organizations (EKLär).

  • 457.
    Aggestam, Lena
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    IT-supported knowledge repositories: Increasing their Usefulness by Supporting Knowledge Capture2008Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Organizations use various resources to achieve business objectives, and for financial gain. In modern business, knowledge is a critical resource, and organizations cannot afford not to manage it. Knowledge Management (KM) aims to support learning and to create value for the organization. Based on three levels of inquiry (why, what, how), work presented in this thesis includes a synthesized view of the existing body of knowledge concerning KM and hence a holistic characterization of KM. This characterization reveals a strong dependency between KM and Learning Organization (LO). Neither of them can be successful without the other. We show that a KM project resulting in an IT-supported knowledge repository is a suitable way to start when the intention is to initiate KM work. Thus, our research focuses on ITsupported knowledge repositories.Large numbers of KM projects fail, and organizations lack support for their KM undertakings. These are the main problems that our research addresses. In order for an IT-supported knowledge repository to be successful, it must be used. Thus, the content of the repository is critical for success. Our work reveals that the process of capturing new knowledge is critical if the knowledge repository is to include relevant and updated knowledge. With the purpose of supporting the capture process, this thesis provides a detailed characterization of the capture process as well as guidance aiming to facilitate the implementation of the capture process in such a way that knowledge is continuously captured, also after the KM implementation project is completed. We argue that the continuous capture of new knowledge which can potentially be stored in the knowledge repository will, in the long term perspective, have a positive influence on the usefulness of the repository. This will most likely increase the number of users of the repository and accordingly increase the number of successful KM projects.All the work presented in this thesis is the result of a qualitative research process comprising a literature review and an empirical study that were carried out in parallel. The empirical study is a case study inspired by action research, which involved participation in the project Efficient Knowledge Management and Learning in Knowledge Intensive Organizations (EKLär).

  • 458.
    Aggestam, Lena
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Knowledge Losses in the Capturing Process2007Ingår i: Managing Worldwide Operations and Communications with Information Technology: Proceedings of the 18th Annual Information Resources Management Association (IRMA) Conference / [ed] Mehdi Khosrow-Pour, Idea Group Inc., 2007, s. 53-56Konferensbidrag (Refereegranskat)
  • 459.
    Aggestam, Lena
    Högskolan i Skövde, Institutionen för datavetenskap.
    Planning for Information Systems Development: A Framework for supporting the management of Success Factors2002Självständigt arbete på avancerad nivå (magisterexamen)Studentuppsats
    Abstract [en]

    In the information systems development process there are important success factors. By doing an extensive literature survey we have found that these factors emerge mainly from organisational issues concerning the objective of the process and the stakeholders.One factor - to discuss the system, its subsystems and to define the system's boundary - is a prerequisite for all the others. Factors emerging from the objective are mainly about the objective being well analysed and defined, being accepted among the stakeholders and meeting business objectives. Factors emerging from stakeholders are mainly about involving the right stakeholders in the process, achieving a positive attitude and taking care of their needs about knowledge and confidence. Based on this we have developed a framework aiming to guide organisations in what considerations they should make before the project begins. As a result of our framework there will be both a clear objective, which support the business mission, as well as positive stakeholders to support the information systems development process.

  • 460.
    Aggestam, Lena
    Högskolan i Skövde, Institutionen för datavetenskap.
    Vidareutveckling av informationssystem: Vilka olika aktiviteter går att identifiera i VAD-fasen?2001Självständigt arbete på grundnivå (kandidatexamen)Studentuppsats
    Abstract [sv]

    Utmärkande för morgondagens IS är att integrera befintliga resurser med nya IS (Lindencrona 2000), dvs att vidareutveckla i stället för att nyutveckla. Då det saknas systematiserad kunskap om den utvecklingsprocess som äger rum då morgondagens IS ska utvecklas är det av yttersta vikt att arbeten vars syfte är att belysa denna process genomförs. Syftet med denna rapport är att undersöka vilka olika aktiviteter som går att identifiera i VAD-fasen, processen fram till kravspecifikationen, då ett administrativt informationssystem ska vidareutvecklas. Inom ramen för detta examensarbete har en litteratur-survey, fokuserad på att samla in material som detaljerat belyser VAD-fasen, utförts. För att samla in material som möjliggör en identifiering av olika aktiviteter i VAD-fasen då ett IS ska vidareutvecklas, har en enkät- respektive en intervju-undersökning av olika organisationer inom aktuell population genomförts.

    Då det insamlade materialet analyserats har i VAD-fasen följande fyra olika aktiviteter kunnat identifieras då ett IS ska vidareutvecklas:

    · Fatta beslut

    · Utföra undersökningar med hjälp av informationsinsamlande aktiviteter

    · Författa dokument

    · Deltaga i diskussioner

    Det erhållna resultatet innebär en god plattform att utgå ifrån då ytterligare forskning ska göras inom området och då metoder för utvecklingen av morgondagens IS ska utvecklas och arbetas fram.

  • 461.
    Aggestam, Lena
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Wanted: A Framework for IT-supported KM2006Ingår i: Emerging Trends and Challenges in Information Technology: 2006 Information Resources Management Association International Conference, Washington, DC, USA, May 21-24, 2006 / [ed] Mehdi Khosrow-Pour, Idea Group Inc., 2006, s. 46-49Konferensbidrag (Refereegranskat)
  • 462.
    Aggestam, Lena
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Backlund, Per
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Strategic Knowledge Management Issues when Designing Knowledge Repositories2007Ingår i: Proceedings of the 15th European Conference on Information Systems, ECIS 2007, Association for Information Systems, 2007, s. 528-539Konferensbidrag (Refereegranskat)
    Abstract [en]

    Knowledge forms an important asset in modern organisations. In order to gain and sustain competitive advantage knowledge has to be managed. One aspect of doing this is to build knowledge repositories. In this paper we extend the strategic knowledge management framework to betters suit the process of constructing knowledge repositories. The extended framework highlights, for example, the impact of organizational culture and the importance of distinguishing between the individual and organizational knowledge processes and relating them to each other. The application of the extended framework to analyze a case in the public health care sector revealed a number of important aspects in the preparation and implementation of a knowledge management project. In particular we highlight the importance of having a strategic vision and making the dual relationship between usage and design explicit when implementing a knowledge repository.

  • 463.
    Aggestam, Lena
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Backlund, Per
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Persson, Anne
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Supporting Knowledge Evaluation to Increase Quality in Electronic Knowledge Repositories2010Ingår i: International Journal of Knowledge Management, ISSN 1548-0666, E-ISSN 1548-0658, Vol. 6, nr 1, s. 23-43Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Knowledge forms an important asset in modern organizations. In order to gain and sustain competitive advantage knowledge has to be managed. One aspect of this is to use Electronic Knowledge Repositories (EKR) to enhance knowledge sharing, reuse and learning. The success of an EKR is dependent on the quality of its content. For knowledge to be stored in an EKR, it has to be captured. One crucial part of the capture process is to evaluate whether the identified knowledge should be incorporated in the EKR or not. Therefore, to increase quality in an EKR, the evaluation stage of the capture process must be successfully carried out. Based on an interpretive field study and an extensive literature review, this paper identifies and characterizes Critical Success Factors (CSF) in the evaluation stage and presents guidance aiming to support implementation of the evaluation stage with the purpose to increase the quality of an EKR. In particular, the guidance supports the decision whether identified knowledge should be stored or not and it highlights the importance of performing evaluation addressing correctness, relevance, protection and redundancy. The characterization of the capture process contributes mainly to KM theory, and the guidance to KM practice.

  • 464.
    Aggestam, Lena
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Persson, Anne
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Increasing the Quality in IT-supported Knowledge Repositories: Critical Success Factors for Identifying Knowledge2010Ingår i: Proceedings of the 43rd Annual Hawaii International Conference on System Sciences, 5-8 January 2010, Koloa, Kauai, Hawaii: Abstracts and CD-ROM of Full Papers / [ed] Ralph H. Sprague, Jr., IEEE Computer Society, 2010, s. 3329-3337Konferensbidrag (Refereegranskat)
    Abstract [en]

    IT-supported knowledge repositories are an important part in Knowledge Management (KM) work. The success of an IT-supported knowledge repository is dependent on what is stored in the repository and hence the ability to capture the right knowledge is a key aspect. Therefore, to increase the quality in an ITsupported Knowledge Repository, the identify activity, which starts the capture process, must be successfully performed. While Critical Success Factors (CSF) for KM and KMS are frequently discussed in the literature, there is a knowledge gap concerning CSF for this specific knowledge capture activity. Based on an interpretive field study and a literature review, this paper proposes and characterizes CSF for the identify activity. For example, we highlight the importance of having organizational knowledge about what knowledge to capture and where to find it, i.e. having knowledge about potential sources of knowledge.

  • 465.
    Aggestam, Lena
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Persson, Anne
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Backlund, Per
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Evaluation criteria to increase information quality in electronic knowledge repositories2008Ingår i: Proceedings of the 16th European Conference on Information Systems (ECIS), Association for Information Systems, 2008, s. 1814-1825Konferensbidrag (Refereegranskat)
    Abstract [en]

    Knowledge forms an important asset in modern organisations. In order to gain and sustain competitive advantage knowledge has to be managed. One aspect of this is to use Electronic Knowledge Repositories (EKRs) in order to enhance knowledge sharing, reuse and learning. The success of an EKR is dependent on the quality of its content. For knowledge to be stored in an EKR, it has to be captured. One crucial part of the capture process is to evaluate whether the identified knowledge should be incorporated in the EKR or not. Therefore, to increase information quality in an EKR, the evaluation stage of the capture process must be successfully performed. This paper characterizes Critical Success Factors (CSF) for knowledge evaluation and presents six evaluation criteria to guide the evaluation stage in order to increase information quality in EKR:s. In particular we highlight the importance of performing evaluation addressing correctness, relevance, protection and redundancy.

     

  • 466.
    Aggestam, Lena
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Söderström, Eva
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Managing Critical Success Factors in a B2B Setting2005Ingår i: International Association for Development of the Information Society, e-commerce, 2005, s. 101-108Konferensbidrag (Refereegranskat)
  • 467.
    Aggestam, Lena
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Söderström, Eva
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Persson, Anne
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Seven Types of Knowledge Loss in the Knowledge Capture Process2010Ingår i: Proceedings of the 18th European Conference on Information Systems (ECIS 2010), Association for Information Systems, 2010, s. Paper 13-Konferensbidrag (Refereegranskat)
    Abstract [en]

    Society is based on knowledge and the availability thereof. Access to knowledge empowers people, and organizations must reuse knowledge to be competitive. The right knowledge to the right person at the right time is important for success, and IT plays an important role in order to achieve this goal, for example in the form of Electronic Knowlege Repositories (EKR). The success of an EKR depends on what is stored therein, and the ability to capture the right knowledge is hence a key aspect. This, however, is a complex issue. The goal of this paper is to identify and describe different types of knowledge loss, seven of which have been identified and characterized. As an example, one knowledge loss shows that not all knowledge can be stored, and critical knowledge elements may therefore be lost when attempting to store it. Some knowledge loss may be desirable, since an organization should not want to store everything. The results contribute to capturing the right knowledge, and hence to successful EKR. The results thus contribute to elevating the competitive power of an organization.

  • 468.
    Aggestam, Lena
    et al.
    Region Västra Götaland, 40544, Gothenburg, Sweden.
    van Laere, Joeri
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    How to Successfully Apply Critical Success Factors in Healthcare Information Systems Development?: A Story from the Field2012Ingår i: Proceedings of the 20th European Conference on Information Systems, Barcelona, Spain 2012, Association for Information Systems, 2012, s. Paper 220-Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many studies have focused on retrospectively identifying critical success factors (CSFs) for healthcare information system (HIS) development projects. In this paper the central question is how in advance selected CSFs can be applied in the best way. An action research study has been carried out in a large Swedish healthcare organization during 2010 and 2011 where the application of four CSFs has been planned, documented and reflected upon. Challenges are identified that may arise when tailoring general CSFs to situational circumstances. For example, the self-evident CSF of ?having a clear and accepted objective? becomes tricky and complex in practice when facing 15 autonomous boards that all need to support the project. Similar insights are gained for other CSFs. More research is needed to illuminate the complexities of how to apply CSFs. Another important observation is that different CSFs strengthen one another, which implies that they should be applied and analysed in concert rather than isolated. Finally, healthcare practitioners need to be aware that CSFs are very helpful, but that tailoring general CSFs to the unique situation of the HIS development project requires much effort and continuous reflection from a holistic perspective embedded in systems thinking.

  • 469. Aggoun, Abderrahmane
    et al.
    Beldiceanu, Nicolas
    Carlsson, Mats
    RISE., Swedish ICT, SICS. Computer Systems Laboratory.
    Fages, François
    Integrating rule-based modelling and constraint programming for solving industrial packing problems2010Ingår i: ERCIM News, ISSN 0926-4981, E-ISSN 1564-0094, s. 34-35Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Packing items in bins is an old but nevertheless challenging combinatorial problem with numerous applications in industry. We report on an original approach based on constraint programming and rule-based modelling, which has been investigated in the framework of the FP6 ‘specific targeted research project’ Net-WMS (Towards integrating virtual reality and optimization techniques in a new generation of Networked businesses in Warehouse Management Systems under constraints). It has applications in the automotive industry.

  • 470.
    Aghaee Ghaleshahi, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    An Efficient Temperature-Gradient Based Burn-In Technique for 3D Stacked ICs2014Ingår i: Design, Automation and Test in Europe Conference and Exhibition (DATE), 2014, IEEE conference proceedings, 2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Burn-in is usually carried out with high temperature and elevated voltage. Since some of the early-life failures depend not only on high temperature but also on temperature gradients, simply raising up the temperature of an IC is not sufficient to detect them. This is especially true for 3D stacked ICs, since they have usually very large temperature gradients. The efficient detection of these early-life failures requires that specific temperature gradients are enforced as a part of the burn-in process. This paper presents an efficient method to do so by applying high power stimuli to the cores of the IC under burn-in through the test access mechanism. Therefore, no external heating equipment is required. The scheduling of the heating and cooling intervals to achieve the required temperature gradients is based on thermal simulations and is guided by functions derived from a set of thermal equations. Experimental results demonstrate the efficiency of the proposed method.

  • 471.
    Aghaee Ghaleshahi, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Efficient Test Application for Rapid Multi-Temperature Testing2015Ingår i: Proceedings of the 25th edition on Great Lakes Symposium on VLSI, Association for Computing Machinery (ACM), 2015, s. 3-8Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Different defects may manifest themselves at different temperatures. Therefore, the tests that target such temperature-dependent defects must be applied at different temperatures appropriate for detecting them. Such multi-temperature testing scheme applies tests at different required temperatures. It is known that a test's power dissipation depends on the previously applied test. Therefore, the same set of tests when organized differently dissipates different amounts of power. The technique proposed in this paper organizes the tests efficiently so that the resulted power levels lead to the required temperatures. Consequently a rapid multi-temperature testing is achieved. Experimental studies demonstrate the efficiency of the proposed technique.

  • 472.
    Aghaee Ghaleshahi, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Process-variation and Temperature Aware SoC Test Scheduling Technique2013Ingår i: Journal of electronic testing, ISSN 0923-8174, E-ISSN 1573-0727, Vol. 29, nr 4, s. 499-520Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    High temperature and process variation are undesirable phenomena affecting modern Systems-on-Chip (SoC). High temperature is a well-known issue, in particular during test, and should be taken care of in the test process. Modern SoCs are affected by large process variation and therefore experience large and time-variant temperature deviations. A traditional test schedule which ignores these deviations will be suboptimal in terms of speed or thermal-safety. This paper presents an adaptive test scheduling method which acts in response to the temperature deviations in order to improve the test speed and thermal safety. The method consists of an offline phase and an online phase. In the offline phase a schedule tree is constructed and in the online phase the appropriate path in the schedule tree is traversed based on temperature sensor readings. The proposed technique is designed to keep the online phase very simple by shifting the complexity into the offline phase. In order to efficiently produce high-quality schedules, an optimization heuristic which utilizes a dedicated thermal simulation is developed. Experiments are performed on a number of SoCs including the ITC'02 benchmarks and the experimental results demonstrate that the proposed technique significantly improves the cost of the test in comparison with the best existing test scheduling method.

  • 473.
    Aghaee Ghaleshahi, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Tekniska högskolan.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Tekniska högskolan.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Tekniska högskolan.
    Process-Variation and Temperature Aware SoC Test Scheduling Using Particle Swarm Optimization2011Ingår i: The 6th IEEE International Design and Test Workshop (IDT'11), Beirut, Lebanon, December 11–14, 2011., IEEE , 2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    High working temperature and process variation are undesirable effects for modern systems-on-chip. It is well recognized that the high temperature should be taken care of during the test process. Since large process variations induce rapid and large temperature deviations, traditional static test schedules are suboptimal in terms of speed and/or thermalsafety. A solution to this problem is to use an adaptive test schedule which addresses the temperature deviations by reacting to them. We propose an adaptive method that consists of a computationally intense offline-phase and a very simple onlinephase. In the offline-phase, a near optimal schedule tree is constructed and in the online-phase, based on the temperature sensor readings, an appropriate path in the schedule tree is traversed. In this paper, particle swarm optimization is introduced into the offline-phase and the implications are studied. Experimental results demonstrate the advantage of the proposed method.

  • 474.
    Aghaee Ghaleshahi, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Process-Variation Aware Multi-temperature Test Scheduling2014Ingår i: 27th International Conference on VLSI Design and 13th International Conference on Embedded Systems, IEEE conference proceedings, 2014, s. 32-37Konferensbidrag (Refereegranskat)
    Abstract [en]

    Chips manufactured with deep sub micron technologies are prone to large process variation and temperature-dependent defects. In order to provide high test efficiency, the tests for temperature-dependent defects should be applied at appropriate temperature ranges. Existing static scheduling techniques achieve these specified temperatures by scheduling the tests, specially developed heating sequences, and cooling intervals together. Because of the temperature uncertainty induced by process variation, a static test schedule is not capable of applying the tests at intended temperatures in an efficient manner. As a result the test cost will be very high. In this paper, an adaptive test scheduling method is introduced that utilizes on-chip temperature sensors in order to adapt the test schedule to the actual temperatures. The proposed method generates a low cost schedule tree based on the variation statistics and thermal simulations in the design phase. During the test, a chip selects an appropriate schedule dynamically based on temperature sensor readings. A 23% decrease in the likelihood that tests are not applied at the intended temperatures is observed in the experimental studies in addition to 20% reduction in test application time.

  • 475.
    Aghaee Ghaleshahi, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Temperature-Gradient Based Burn-In for 3D Stacked ICs2013Ingår i: The 12th Swedish System-on-Chip Conference (SSoCC 2013), Ystad, Sweden, May 6-7, 2013 (not reviewed, not printed)., 2013Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    3D Stacked IC fabrication, using Through-Silicon-Vias, is a promising technology for future integrated circuits. However, large temperature gradients may exacerbate early-life-failures to the extent that the commercialization of 3D Stacked ICs is challenged. The effective detection of these early-life-failures requires that burn-in is performed when the IC’s temperatures comply with the thermal maps that properly specify the temperature gradients. In this paper, two methods that efficiently generate and maintain the specified thermal maps are proposed. The thermal maps are achieved by applying heating and cooling intervals to the chips under test through test access mechanisms. Therefore, no external heating system is required. The scheduling of the heating and cooling intervals is based on thermal simulations. The schedule generation is guided by functions that are derived from the temperature equations. Experimental results demonstrate the efficiency of the proposed method.

  • 476.
    Aghaee Ghaleshahi, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Temperature-Gradient Based Test Scheduling for 3D Stacked ICs2013Ingår i: 2013 IEEE International Conference on Electronics, Circuits, and Systems, IEEE conference proceedings, 2013, s. 405-408Konferensbidrag (Refereegranskat)
    Abstract [en]

    Defects that are dependent on temperature-gradients (e.g., delay-faults) introduce a challenge for achieving an effective test process, in particular for 3D ICs. Testing for such defects must be performed when the proper temperature gradients are enforced on the IC, otherwise these defects may escape the test. In this paper, a technique that efficiently heats up the IC during test so that it complies with the specified temperature gradients is proposed. The specified temperature gradients are achieved by applying heating sequences to the cores of the IC under test trough test access mechanism; thus no external heating mechanism is required. The scheduling of the test and heating sequences is based on thermal simulations. The schedule generation is guided by functions derived from the IC's temperature equation. Experimental results demonstrate that the proposed technique offers considerable test time savings.

  • 477.
    Aghaee, Naghmeh
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Finding Potential Problems in the Thesis Process in Higher Education: Analysis of e-mails to develop a support system2015Ingår i: Education and Information Technologies: Official Journal of the IFIP technical committee on Education, ISSN 1360-2357, E-ISSN 1573-7608, Vol. 20, nr 1, s. 21-36Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Autonomous learning hype has created much speculation in educational systems regarding how to develop the learning process. Final project (thesis) in Bachelor’s and Master’s levels is a significant part of study for students in higher education. However, there are some problems, which lead students not managing to do or finish their thesis. As a part of a solution to these problems, the Department of Computer and Systems Sciences (DSV) at Stockholm University, Sweden, has established an information and communication platform, called SciPro. The system was initiated in 2011 to support students and supervisors during the thesis process courses. This study contributes by exploring problems that learners have faced during the final project courses and analyzing discussed issues in the emails, sent to the SciPro support group, ThesisSupport. A random sample of one hundred emails has been analyzed with the help of a content analysis tool, in order to develop the categories, which cover the discussed issues. The result of the study shows six exhaustive and mutually exclusive categories of problems: 1) Thesis initiation (26 %), 2) Info-mail (4.7 %), 3) Technical issues (17.1 %), 4) Exemption (18.7 %), 5) Supervision (17.1 %), 6) Final seminar (16.4 %). Consequently, based on the significance of the categories, two groups of strategic suggestions are developed: 1) developing communications and 2) developing instructions. These strategies intend to enhance support for the autonomous learning process for the thesis courses in higher education.

  • 478.
    Aghaee, Naghmeh
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    The Usefulness of ICT Support Systems for Thesis Courses: Learners' Perspectives at Bachelor and Master Level2015Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Doing a bachelor’s or master’s degree is a journey that leads to success or attrition (dropout). Previous research show to the significance of considering learners’ perspectives and their need for information and different types of interaction. This can be done through online ICTSS (information and communication technology support systems). The overall aim of this dissertation was to create knowledge about how the use of ICTSS can facilitate different types of interaction and support learners in order to reduce thesis problems and attrition and to enhance the quality of the thesis outcomes. The aim was operationalized by two research questions scrutinizing the interaction problems in the thesis process and investigating how the use of ICTSS can facilitate different types of interaction to reduce such problems and attrition, and to enhance the learning opportunities and quality of the thesis outcomes. To answer the research questions, five main studies were performed by applying different research methods on a case study. The empirical studies were performed at the Department of Computer and Systems Sciences (DSV) at Stockholm University, Sweden. The respondents were different learners (students) with active thesis projects at the bachelor or master level in different programs at DSV between 2012 and 2015. For the first two studies, conceptual and content analysis of the data collected from the case study was performed. For the three other studies, open-ended online questionnaires (survey) and interviews were conducted. On the basis of the findings, three main types of interaction issues were developed which related to the need for more learner-content, peer-to-peer, and learner-supervisor interaction in the thesis process. The hypothesis was that the interaction issues could be reduced by implementing a set of strategic suggestions through the use of an ICTSS including a set of functionalities and resources. The usefulness of these functionalities and resources was evaluated with regard to the learners’ perception and experiences. The findings were categorized to facilitate learner-content, peer-to-peer, and learner-supervisor interaction, as well as management of the contents, supervision, and communication of the supervisory team. From these categories, a conceptual framework was developed in this dissertation to illustrate how the use of the ICTSS supports the thesis process. In conclusion, providing access to a set of structured e-resources and supporting educational communication through different types of interaction with peers and the supervisory team, enables learners’ self-managed learning and facilitates similar learning opportunities for learners in thesis courses.

  • 479.
    Aghaee, Naghmeh
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hansson, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Peer Portal: Quality Enhancement in Thesis Writing Using Self-Managed Peer Review on a Mass Scale2013Ingår i: International Review of Research in Open and Distance Learning, ISSN 1492-3831, E-ISSN 1492-3831, Vol. 14, nr 1, s. 186-203Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    This paper describes a specially developed online peer-review system, the Peer Portal, and the first results of its use for quality enhancement of bachelor's and master's thesis manuscripts. The peer-review system is completely student driven and therefore saves time for supervisors and creates a direct interaction between students without interference from supervisors. The purpose is to improve thesis manuscript quality, and thereby use supervisor time more efficiently, since peers review basic aspects of the manuscripts and give constructive suggestions for improvements. The process was initiated in 2012, and, in total, 260 peer reviews were completed between 1st January and 15th May, 2012. All peer reviews for this period have been analyzed with the help of content analysis. The purpose of analysis is to assess the quality of the students work. The results are categorized in four groups: 1) excellent (18.1%), 2) good (22.7%), 3) fragmented (18.5%), and 4) poor (40.7%). The overall result shows that almost 40% of the students produced excellent or good peer reviews and almost as many produced poor peer reviews. The result shows that the quality varies considerably. Explanations of these quality variations need further study. However, alternative hypotheses followed by some strategic suggestions are discussed in this study. Finally, a way forward in terms of improving peer reviews is outlined: 1) development of a peer wizard system and 2) rating of received peer reviews based on the quality categories created in this study. A Peer Portal version 2.0 is suggested, which will eliminate the fragmented and poor quality peer reviews, but still keep this review system student driven and ensure autonomous learning.

  • 480.
    Aghaee, Naghmeh
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hansson, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Tedre, Matti
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Drougge, Ulrika
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Learners’ Perceptions on the Structure and Usefulness of e-Resources for the Thesis Courses2014Ingår i: European Journal of Open and Distance Learning, ISSN 1027-5207, E-ISSN 1027-5207, Vol. 17, nr 1, s. 154-171Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nowadays, utility of information and communication technology (ICT) in education is a way to facilitate interaction and accessing information for learning in higher education. However, finding a set of structured e-resources to facilitate learning within specific courses is still a big challenge in most of the institutions and universities. This includes the problems and challenges for the thesis courses in both undergraduate (Bachelor) and graduate (Master) level in Sweden. To overcome or reduce the problems and enhance quality of outcomes in the thesis courses, the department of Computer and Systems Sciences (DSV) at Stockholm University has developed a Learning Support System, SciPro (Scientific Process), to support thesis process. This study aims at investigating learners’ perspectives on usefulness of structured e-resources in order to reduce challenges for finding information related to the thesis steps in SciPro. This is done based on an open online survey, carried out in 2012-2013 of students’ perspectives at DSV. The study found the actual problems and hence suggested a model as a way forward to sort the useful e-resources to support reducing the problems in the thesis process.

  • 481.
    Aghaee, Naghmeh
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Jobe, William Byron
    Karunaratne, Thashmee
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Smedberg, Åsa
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hansson, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Tedre, Matti
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Interaction Gaps in PhD Education and ICT as a Way Forward: Results from a Study in Sweden2016Ingår i: The International Review of Research in Open and Distributed Learning, ISSN 1492-3831, Vol. 17, nr 3, s. 360-383Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Many research studies have highlighted the low completion rate and slow progress in PhD education. Universities strive to improve throughput and quality in their PhD education programs. In this study, the perceived problems of PhD education are investigated from PhD students' points of view, and how an Information and Communication Technology Support System (ICTSS) may alleviate these problems. Data were collected through an online open questionnaire sent to the PhD students at the Department of (the institution's name has been removed during the double-blind review) with a 59% response rate. The results revealed a number of problems in the PhD education and highlighted how online technology can support PhD education and facilitate interaction and communication, affect the PhD students' satisfaction, and have positive impacts on PhD students' stress. A system was prototyped, in order to facilitate different types of online interaction through accessing a set of online and structured resources and specific communication channels. Although the number of informants was not large, the result of the study provided some rudimentary ideas that refer to interaction problems and how an online ICTSS may facilitate PhD education by providing distance and collaborative learning, and PhD students' self-managed communication.

  • 482.
    Aghaee, Naghmeh
    et al.
    Stockholm University.
    Karunaratne, Thashmee
    Stockholm University.
    Smedberg, Åsa
    Stockholm University.
    Jobe, William
    Högskolan Väst, Institutionen för ekonomi och it, Avd för informatik.
    Communication and Collaboration Gaps among PhD Students and ICT as a Way Forward: Results from a Study in Sweden2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    The low completion rate and slow progress in PhD education have been highlighted in many studies. However, the interaction problems and communication gaps that PhD students encounter make this attempt even more challenging. The aim of this study is to investigate the peer interaction problems and ICT based solutions from PhD students’ perspectives. The data collection method was an online questionnaire and in-depth interviews were used to follow up. The target group for the survey was the PhD students in Computer Science at Stockholm University. The total number of respondents for the survey was 53 PhD students and eleven randomly selected PhD students for the interviews. The results reflected a lack of peer interaction as an important issue in the perspective of the students. Based on this, the study showed several ICT solutions that have the potential to reduce the interaction problems and thereby improve PhD students’ collaborative learning and research quality.

  • 483.
    Aghaee, Naghmeh
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Karunaratne, Thashmee
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Smedberg, Åsa
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Jobe, William Byron
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    ICT for Communication and Collaborative Learning among PhD peers: Results of the Needs and Desires from a PhD Survey2014Ingår i: DSV writers hut 2014: proceedings, August 21-22, Åkersberga, Sweden / [ed] Gustaf Juell-Skielse, Stockholm: Department of Computer and Systems Sciences, Stockholm University , 2014, s. 33-40Konferensbidrag (Refereegranskat)
  • 484.
    Aghaee, Naghmeh
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Keller, Christina
    ICT-supported peer interaction among learners in Bachelor's and Master's thesis courses2016Ingår i: Computers and education, ISSN 0360-1315, E-ISSN 1873-782X, Vol. 94, s. 276-297Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Peer interaction and collaborative learning through the use of ICT (Information and Communication Technology) is used to an increasing extent in higher education. Universities attempt to motivate learners (students) to support their peers to enhance the quality of learning outcomes. This study monitors how an ICTSS (ICT-based Support System) facilitates peer interaction in the Bachelor’s and Master’s thesis process. The aim of the study was to investigate learners’ perception of usefulness of an ICTSS for peer interaction and the influencing factors on the quality of the peer interaction. The ICTSS was developed at an institution in Sweden (the institution’s name has been removed during the double-blind review). The system facilitates peer interaction in three ways: peer reviews, active participation, and final opposition. The study employed a mixed-method approach, which included an online survey followed by in-depth interviews. The target groups were learners at the Bachelor’s and Master’s level in computer science and information systems. The findings showed that learners perceived the peer interaction useful to enhance the quality of the thesis outcomes. However, there are influencing factors affecting the quality of peer interaction, in different phases of the thesis process. Examples of these factors are the quality of thesis manuscripts, supervisors’ control and grading of the process, clear instructions and guidelines, learners’ understanding of the peer interaction and why it takes place, previous training and learners’ motivation to perform peer reviews. Following these factors, the study developed a set of strategic suggestions from both pedagogical and technical aspects to enhance the peer interaction in the thesis process. Considering these suggestions makes the use of the ICTSS more effective to enhance the quality of thesis learning outcomes. 

  • 485.
    Aghaee, Naghmeh
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Larsson, Ken
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Students’ Perspectives on Utility of Mobile Applications in Higher Education2013Ingår i: Trends in Mobile Web Information Systems: Revised Selected Papers / [ed] Maristella Matera, Gustavo Rossi, Springer Publishing Company, 2013, s. 44-56Konferensbidrag (Refereegranskat)
    Abstract [en]

    Use of Information and Communication Technologies (ICT) in pedagogy and learning in higher education supports the concept of Technology Enhanced Learning (TEL). Mobile devices and applications with educational purposes are part of using online ICT and facilitate autonomous learning in education. Using mobile applications for education has significantly improved in the last few years. However, there is still a gap, in which this concept is still not widely known and frequently experienced by learners. As a part of supporting TEL in higher education and filling this gap, the department of Computer and System Sciences at Stockholm University in Sweden is planning to develop a mobile application for the SciPro system. SciPro is the computer-mediated communication platform to support enhancement of thesis quality and facilitate autonomous learning in higher education, at both Bachelor and Master levels. This study aims to investigate and evaluate learners’ perspectives about utility of mobile applications in higher education and specifically to support SciPro functionalities. Almost 95% of the respondents use mobile applications for higher education and believe in the utility of mobile applications for supporting learning in higher education. This is while there are a few respondents (less than 5%), who do not fully share this opinion. More than 70% of the respondents think that a SciPro mobile application will add value to their thesis process. Even though it may not directly affect the speed and quality of the thesis, it will increase mobility, availability, and flexibility of accessing information and resources in SciPro.

  • 486.
    Aghaee, Naghmeh
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Larsson, Ulf
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hansson, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Improving the Thesis Process: Analysis of Scipro Support e-mails2012Manuskript (preprint) (Övrig (populärvetenskap, debatt, mm))
  • 487.
    Aghaee, Nam
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Karunaratne, Thashmee
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Smedberg, Åsa B.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Jobe, William
    Communication and Collaboration Gaps among PhD Students and ICT as a Way Forward: Results from a Study in Sweden2015Ingår i: E-Learn: 20 th annual World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education 2015, 2015Konferensbidrag (Refereegranskat)
  • 488.
    Aghaee, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Tekniska fakulteten.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Tekniska fakulteten.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Tekniska fakulteten.
    A Test-Ordering Based Temperature-Cycling Acceleration Technique for 3D Stacked ICs2015Ingår i: Journal of electronic testing, ISSN 0923-8174, E-ISSN 1573-0727, ISSN 0923-8174, Vol. 31, nr 5, s. 503-523Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    n a modern three-dimensional integrated circuit (3D IC), vertically stacked dies are interconnected using through silicon vias. 3D ICs are subject to undesirable temperature-cycling phenomena such as through silicon via protrusion as well as void formation and growth. These cycling effects that occur during early life result in opens, resistive opens, and stress induced carrier mobility reduction. Consequently these early-life failures lead to products that fail shortly after the start of their use. Artificially-accelerated temperature cycling, before the manufacturing test, helps to detect such early-life failures that are otherwise undetectable. A test-ordering based temperature-cycling acceleration technique is introduced in this paper that integrates a temperature-cycling acceleration procedure with pre-, mid-, and post-bond tests for 3D ICs. Moreover, it reduces the need for costly temperature chamber based temperature-cycling acceleration methods. All these result in a reduction in the overall test costs. The proposed method is a test-ordering and schedule based solution that enforces the required temperature cycling effect and simultaneously performs the tests whenever appropriate. Experimental results demonstrate the efficiency of the proposed technique.

  • 489.
    Aghaee, Nima
    et al.
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Temperature-Gradient-Based Burn-In and Test Scheduling for 3-D Stacked ICs2015Ingår i: IEEE Transactions on Very Large Scale Integration (vlsi) Systems, ISSN 1063-8210, E-ISSN 1557-9999, Vol. 23, nr 12, s. 2992-3005Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Large temperature gradients exacerbate various types of defects including early-life failures and delay faults. Efficient detection of these defects requires that burn-in and test for delay faults, respectively, are performed when temperature gradients with proper magnitudes are enforced on an Integrated Circuit (IC). This issue is much more important for 3-D stacked ICs (3-D SICs) compared with 2-D ICs because of the larger temperature gradients in 3-D SICs. In this paper, two methods to efficiently enforce the specified temperature gradients on the IC, for burn-in and delay-fault test, are proposed. The specified temperature gradients are enforced by applying high-power stimuli to the cores of the IC under test through the test access mechanism. Therefore, no external heating mechanism is required. The tests, high power stimuli, and cooling intervals are scheduled together based on temperature simulations so that the desired temperature gradients are rapidly enforced. The schedule generation is guided by functions derived from a set of thermal equations. The experimental results demonstrate the efficiency of the proposed methods.

  • 490.
    Aghaee, Saeed
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Random Stream Cipher2007Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [en]

    Stream ciphers are counted as an important part of symmetric encryption method. Their basic idea comes from One-Time-Pad cipher using XOR operator on the plain text and the key to generate the cipher. The present work brings a new idea in symmetric encryption method, which inherits stream key generation idea from synchronous stream cipher and uses division instead of xoring. The Usage of division to combine the plain text with stream key gives numerous abilities to this method that the most important one is using random factors to produce the ciphers.

  • 491.
    Aghanavesi, Somayeh
    et al.
    School of Technology and Business Studies, Computer Engineering, Dalarna University, Falun, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Dougherty, Mark
    School of Technology and Business Studies, Computer Engineering, Dalarna University, Falun, Sweden.
    Nyholm, Dag
    Department of Neuroscience, Neurology, Uppsala University, Sweden.
    Westin, Jerker
    School of Technology and Business Studies, Computer Engineering, Dalarna University, Falun, Sweden.
    Verification of a Method for Measuring Parkinson’s Disease Related Temporal Irregularity in Spiral Drawings2017Ingår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, nr 10, artikel-id 2341Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Parkinson’s disease (PD) is a progressive movement disorder caused by the death of dopamine-producing cells in the midbrain. There is a need for frequent symptom assessment, since the treatment needs to be individualized as the disease progresses. The aim of this paper was to verify and further investigate the clinimetric properties of an entropy-based method for measuring PD-related upper limb temporal irregularities during spiral drawing tasks. More specifically, properties of a temporal irregularity score (TIS) for patients at different stages of PD, and medication time points were investigated. Nineteen PD patients and 22 healthy controls performed repeated spiral drawing tasks on a smartphone. Patients performed the tests before a single levodopa dose and at specific time intervals after the dose was given. Three movement disorder specialists rated videos of the patients based on the unified PD rating scale (UPDRS) and the Dyskinesia scale. Differences in mean TIS between the groups of patients and healthy subjects were assessed. Test-retest reliability of the TIS was measured. The ability of TIS to detect changes from baseline (before medication) to later time points was investigated. Correlations between TIS and clinical rating scores were assessed. The mean TIS was significantly different between healthy subjects and patients in advanced groups (p-value = 0.02). Test-retest reliability of TIS was good with Intra-class Correlation Coefficient of 0.81. When assessing changes in relation to treatment, TIS contained some information to capture changes from Off to On and wearing off effects. However, the correlations between TIS and clinical scores (UPDRS and Dyskinesia) were weak. TIS was able to differentiate spiral drawings drawn by patients in an advanced stage from those drawn by healthy subjects, and TIS had good test-retest reliability. TIS was somewhat responsive to single-dose levodopa treatment. Since TIS is an upper limb high-frequency-based measure, it cannot be detected during clinical assessment.

  • 492.
    Aghanavesi, Somayeh
    et al.
    Computer Engineering, School of Technology and Business Studies, Dalarna University, Borlänge, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Westin, Jerker
    Computer Engineering, School of Technology and Business Studies, Dalarna University, Borlänge, Sweden.
    Measuring temporal irregularity in spiral drawings of patients with Parkinson’s disease2017Ingår i: Abstracts of the 21st International Congress of Parkinson's Disease and Movement Disorders, John Wiley & Sons, 2017, Vol. 32, s. s252-s252, artikel-id 654Konferensbidrag (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Objective: The aim of this work is to evaluate clinimetric properties of a method for measuring Parkinson’s disease (PD) upper limb temporal irregularities during spiral drawing tasks.

    Background: Basal ganglia fluctuations of PD patients are associated with motor symptoms and relating them to objective sensor-based measures may facilitate the assessment of temporal irregularities, which could be difficult to be assessed visually. The present study investigated the upper limb temporal irregularity of patients at different stages of PD and medication time points.

    Methods: Nineteen PD patients and 22 healthy controls performed repeated spiral drawing tasks on a smartphone. Patients performed the tests before a single levodopa dose and at specific time intervals after the dose was given. Three movement disorder specialists rated the videos of patients' performance according to six items of UPDRS-III, dyskinesia (Dys), and Treatment Response Scale (TRS). A temporal irregularity score (TIS) was developed using approximate entropy (ApEn) method. Differences in mean TIS between two groups of patients and healthy subjects, and also across four subject groups: early, intermediate, advanced patients and, healthy subjects were assessed. The relative ability of TIS to detect changes from baseline (no medication) to later time points when patients were on medication was assessed. Correlations between TIS and clinical rating scales were assessed by Pearson correlation coefficients and test-retest reliability of TIS was measured by intra-class correlation coefficients (ICC).

    Results: The mean TIS was significantly different between healthy subjects and patients (P<0.0001). When assessing the changes in relation to treatment, clinical-based scores (TRS and Dys) had better responsiveness than TIS. However, the TIS was able to capture changes from Off to On, and the wearing off effects. Correlations between TIS and clinical scales were low indicating poor validity. Test-retest reliability correlation coefficient of the mean TIS was good (ICC=0.67).

    Conclusions: Our study found that TIS was able to differentiate spiral drawings drawn by patients from those drawn by healthy subjects. In addition, TIS could capture changes throughout the levodopa cycle.TIS was weakly correlated to clinical ratings indicating that TIS measures high frequency upper limb temporal irregularities that could be difficult to be detected during clinical observations.

  • 493.
    Aghanavesi, Somayeh
    et al.
    Computer Engineering, School of Technology and Business Studies, Dalarna University, Sweden.
    Nyholm, Dag
    Dept. of Neuroscience, Neurology, Uppsala University, Sweden.
    Senek, Marina
    Dept. of Neuroscience, Neurology, Uppsala University, Sweden.
    Bergquist, Filip
    Dept. of Pharmacology, University of Gothenburg, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Computer Engineering, School of Technology and Business Studies, Dalarna University, Sweden.
    A smartphone-based system to quantify dexterity in Parkinson's disease patients2017Ingår i: Informatics in Medicine Unlocked, ISSN 2352-9148Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Objectives

    The aim of this paper is to investigate whether a smartphone-based system can be used to quantify dexterity in Parkinson's disease (PD). More specifically, the aim was to develop data-driven methods to quantify and characterize dexterity in PD.

    Methods

    Nineteen advanced PD patients and 22 healthy controls participated in a clinical trial in Uppsala, Sweden. The subjects were asked to perform tapping and spiral drawing tests using a smartphone. Patients performed the tests before, and at pre-specified time points after they received 150% of their usual levodopa morning dose. Patients were video recorded and their motor symptoms were assessed by three movement disorder specialists using three Unified PD Rating Scale (UPDRS) motor items from part III, the dyskinesia scoring and the treatment response scale (TRS). The raw tapping and spiral data were processed and analyzed with time series analysis techniques to extract 37 spatiotemporal features. For each of the five scales, separate machine learning models were built and tested by using principal components of the features as predictors and mean ratings of the three specialists as target variables.

    Results

    There were weak to moderate correlations between smartphone-based scores and mean ratings of UPDRS item #23 (0.52; finger tapping), UPDRS #25 (0.47; rapid alternating movements of hands), UPDRS #31 (0.57; body bradykinesia and hypokinesia), sum of the three UPDRS items (0.46), dyskinesia (0.64), and TRS (0.59). When assessing the test-retest reliability of the scores it was found that, in general, the clinical scores had better test-retest reliability than the smartphone-based scores. Only the smartphone-based predicted scores on the TRS and dyskinesia scales had good repeatability with intra-class correlation coefficients of 0.51 and 0.84, respectively. Clinician-based scores had higher effect sizes than smartphone-based scores indicating a better responsiveness in detecting changes in relation to treatment interventions. However, the first principal component of the 37 features was able to capture changes throughout the levodopa cycle and had trends similar to the clinical TRS and dyskinesia scales. Smartphone-based scores differed significantly between patients and healthy controls.

    Conclusions

    Quantifying PD motor symptoms via instrumented, dexterity tests employed in a smartphone is feasible and data from such tests can also be used for measuring treatment-related changes in patients.

  • 494.
    Aghaunor, Lavin
    et al.
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Fotoh, Xavieria
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Factors Affecting ecommerce adoption in Nigerian Banks2006Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats
  • 495.
    Aghazadeh, Omid
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Data Driven Visual Recognition2014Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    This thesis is mostly about supervised visual recognition problems. Based on a general definition of categories, the contents are divided into two parts: one which models categories and one which is not category based. We are interested in data driven solutions for both kinds of problems.

    In the category-free part, we study novelty detection in temporal and spatial domains as a category-free recognition problem. Using data driven models, we demonstrate that based on a few reference exemplars, our methods are able to detect novelties in ego-motions of people, and changes in the static environments surrounding them.

    In the category level part, we study object recognition. We consider both object category classification and localization, and propose scalable data driven approaches for both problems. A mixture of parametric classifiers, initialized with a sophisticated clustering of the training data, is demonstrated to adapt to the data better than various baselines such as the same model initialized with less subtly designed procedures. A nonparametric large margin classifier is introduced and demonstrated to have a multitude of advantages in comparison to its competitors: better training and testing time costs, the ability to make use of indefinite/invariant and deformable similarity measures, and adaptive complexity are the main features of the proposed model.

    We also propose a rather realistic model of recognition problems, which quantifies the interplay between representations, classifiers, and recognition performances. Based on data-describing measures which are aggregates of pairwise similarities of the training data, our model characterizes and describes the distributions of training exemplars. The measures are shown to capture many aspects of the difficulty of categorization problems and correlate significantly to the observed recognition performances. Utilizing these measures, the model predicts the performance of particular classifiers on distributions similar to the training data. These predictions, when compared to the test performance of the classifiers on the test sets, are reasonably accurate.

    We discuss various aspects of visual recognition problems: what is the interplay between representations and classification tasks, how can different models better adapt to the training data, etc. We describe and analyze the aforementioned methods that are designed to tackle different visual recognition problems, but share one common characteristic: being data driven.

  • 496.
    Aghazadeh, Omid
    KTH, Skolan för datavetenskap och kommunikation (CSC).
    Object Segmentation using Spatial and Spatio-Temporal Features.2011Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
  • 497.
    Aghazadeh, Omid
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Azizpour, Hossein
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Sullivan, Josephine
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Carlsson, Stefan
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Mixture component identification and learning for visual recognition2012Ingår i: Computer Vision – ECCV 2012: 12th European Conference on Computer Vision, Florence, Italy, October 7-13, 2012, Proceedings, Part VI, Springer, 2012, s. 115-128Konferensbidrag (Refereegranskat)
    Abstract [en]

    The non-linear decision boundary between object and background classes - due to large intra-class variations - needs to be modelled by any classifier wishing to achieve good results. While a mixture of linear classifiers is capable of modelling this non-linearity, learning this mixture from weakly annotated data is non-trivial and is the paper's focus. Our approach is to identify the modes in the distribution of our positive examples by clustering, and to utilize this clustering in a latent SVM formulation to learn the mixture model. The clustering relies on a robust measure of visual similarity which suppresses uninformative clutter by using a novel representation based on the exemplar SVM. This subtle clustering of the data leads to learning better mixture models, as is demonstrated via extensive evaluations on Pascal VOC 2007. The final classifier, using a HOG representation of the global image patch, achieves performance comparable to the state-of-the-art while being more efficient at detection time.

  • 498.
    Aghazadeh, Omid
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Carlsson, Stefan
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Large Scale, Large Margin Classification using Indefinite Similarity MeasurensManuskript (preprint) (Övrigt vetenskapligt)
  • 499.
    Aghazadeh, Omid
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Carlsson, Stefan
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Properties of Datasets Predict the Performance of Classifiers2013Ingår i: BMVC 2013 - Electronic Proceedings of the British Machine Vision Conference 2013, British Machine Vision Association, BMVA , 2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    It has been shown that the performance of classifiers depends not only on the number of training samples, but also on the quality of the training set [10, 12]. The purpose of this paper is to 1) provide quantitative measures that determine the quality of the training set and 2) provide the relation between the test performance and the proposed measures. The measures are derived from pairwise affinities between training exemplars of the positive class and they have a generative nature. We show that the performance of the state of the art methods, on the test set, can be reasonably predicted based on the values of the proposed measures on the training set. These measures open up a wide range of applications to the recognition community enabling us to analyze the behavior of the learning algorithms w.r.t the properties of the training data. This will in turn enable us to devise rules for the automatic selection of training data that maximize the quantified quality of the training set and thereby improve recognition performance.

  • 500.
    Aghazadeh, Omid
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Carlsson, Stefan
    KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP.
    Properties of Datasets Predict the Performance of Classifiers2013Manuskript (preprint) (Övrigt vetenskapligt)
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