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  • 5351. Hossfeld, Tobias
    et al.
    Fiedler, Markus
    Zinner, Thomas
    The QoE provisioning-delivery-hysteresis and its importance for service provisioning in the Future Internet2011Conference paper (Refereed)
    Abstract [en]

    Quality of Experience (QoE) combines non-technical parameters such as user perception, experience and expectations with technical parameters such as application-and network-level Quality of Service (QoS). For service or network providers, it is important to understand the quantitative relationship between QoE and these technical parameters in order to manage the user-perceived quality. This paper investigates the different impacts of a) provisioning and b) delivery problems due to insufficient resources on QoE, leading to the QoE provisioning-delivery hysteresis (QoE-PDH). We demonstrate the QoE-PDH for Voice-over-IP, live video streaming, and web browsing based on existing measurement studies. The results clearly quantify the necessity to control quality, instead of suffering from uncontrollable impacts like packet loss caused by congestion. The implementation and the limitations of the QoE-PDH in the current Internet is shown using the example of Skype. Afterwards we discuss how these results can be used to enhance energy-efficient service provisioning and delivery in the Future Internet.

  • 5352. Hossfeld, Tobias
    et al.
    Hock, David
    Tran-Gia, Phuoc
    Tutschku, Kurt
    Blekinge Institute of Technology, School of Engineering, Department of Telecommunication Systems.
    Fiedler, Markus
    Blekinge Institute of Technology, School of Engineering, Department of Telecommunication Systems.
    Testing the IQX Hypothesis for Exponential Interdependency between QoS and QoE of Voice Codecs iLBC and G.7112008Conference paper (Refereed)
    Abstract [en]

    Given the growing importance of quantitative relationships between user-perceived Quality of Experience (QoE) and network Quality of Service (QoS), this paper investigates the IQX hypothesis for two voice codecs, iLBC and G.711. This hypothesis expresses QoE as an exponential function of QoS degradation. The experiments are carried out in a controlled environment using the softphone SJPhone, the network emulator NIST Net, and a tool calculating the PESQ (Perceptual Evaluation of Speech Quality) from sent and received audio files. The IQX hypothesis is confirmed exactly for disturbances perceived on applications level, packet loss and packet reordering, which clearly correlate to the main sensitivities of the used softphone to packet-level disturbances such as loss, jitter and reordering. So, besides of providing a unified relationship between QoE and QoS, the IQX also proved to be capable of identifying the QoS parameters of relevance for QoE degradations. The study also points out interesting tracks for future work in terms of QoS degradations and related QoE evaluations.

  • 5353. Hossfeld, Tobias
    et al.
    Tran-Gia, Phuoc
    Fiedler, Markus
    Quantification of Quality of Experience for Edge-Based Applications2007Conference paper (Refereed)
    Abstract [en]

    In future Internet, multi-network services correspond to a new paradigm that intelligence in network control is gradually moved to the edge of the network. As consequences of the shift of the control intelligence, the application itself can influence or determine the amount of consumed bandwidth. Thus the user behaviour changes dramatically. This impacts the Quality of Service (QoS) and the Qualtiy of Experience (QoE). The QoE is a subjective measure from the user perspective of the overall value of the provided service or application. A selfish user or application tries to maximize its own QoE rather than to optimize the network QoS, in contrast to legacy altruistic user. In this paper we present an hypothesis, IQ-L (interdependency of QoE and loss), which assumes an exponential functional relationship between QoE and QoS. This contribution is a first step towards the quantification of the QoE for edge-based applications, where an example of VoIP is taken into account. Starting from a measurement of the Skype application, we show the basic properties of selfish and altruistic user behaviour in accordance to edge-based intelligence. The QoE is quantified in terms of MOS in dependence of the packet loss of the end-to-end connection, whereby the iLBC voice codec is used exemplarily. It is shown that the IQ-L hypothesis is verified in this application scenario. Furthermore, a selfish user behaviour with replicated sending of voice datagrams is investigated with respect to the obtained QoE of a single user. In addition, the impact of this user behaviour on congestion in the network is outlined by means of simulations.

  • 5354.
    Hou, Diyun
    Blekinge Institute of Technology, School of Planning and Media Design.
    Urban Waterfront Landscape Planning2009Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    As a high quality green belt in the city, a city's waterfront landscape is can be a liveable and comfortable place. For citizens, it is also an attractive place to live in. A good city waterfront landscape can be updated and maintained by itself. Therefore, we can not treat the urban waterfront area as just a beautiful landscape in aesthetic terms, but we should also understand it in deeper and broader dimensions. The urban waterfront landscape directly affects the urban structure, the urban ecological environment and the life quality of the urban residents. By analysizing the two cases, Western Harbor in Malmö and Jinji Lake in Suzhou China, we can draw some interesting conclusions about waterfront landscape. Through the discussion of this subject, I aim for an understanding of the urban waterfront landscape as a harmonious system with the artificial and natural landscapes working together, based on scientific and artistic aspects.

  • 5355.
    Hou, Mengyu
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    How Can Protection of the Ming City Wall in Nanjing Improve the Urban Spatial Form of Nanjing City?2014Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    In recent years, with the continuous expansion and reconstruction of Nanjing city, the Ming city wall has been damaged and destroyed which greatly affects the image of Nanjing city. More and more scholars begin to focus on protecting Ming city wall. It has become a controversial issue how can wall protection in harmony with the surroundings and improve the urban spatial form of Nanjing city. This thesis mainly studies on Ming city wall on the basis of urban spatial morphology theory, aiming to give a new design proposal to Zhonghua segment wall in Qinhuai District in Nanjing city, making full use of the historical and cultural resources to create a comprehensive urban space close to Qinhuai River. For this purpose, urban spatial morphology theory is used as the literature theory to guide the design proposal. Methods and principles are concluded according to some local documents from the literature and books such as Thinking about Urban Form (Conzen, 1998) and the Image of the City (Lynch, 1960), as well as some Chinese articles. Lynch (1960) put forward five concepts in urban planning; they are paths, nodes, landmarks, edges and districts. In the design proposal, I will analyze the project area from these five aspects. And the principles which I concluded in the consideration of the current situation of Ming city wall are the main guidelines to conduct the proposal. By means of this thesis, it is hoped the restoration of Zhonghua segment wall can create some public urban space and improve surrounding urban form to some extents. Besides, some inspiration about wall protection and some planning approaches, as well as working principles might be useful for the further related study.

  • 5356.
    Hoy, Sara
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Sarker, Christina Swarna
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Schmidt, Eike Niclas
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Planting Seeds for the Future: Sustainability, Theory U, and Youth2018Independent thesis Advanced level (degree of Master (One Year)), 20 HE creditsStudent thesis
    Abstract [en]

    Youth will be dealing with the global sustainability challenge that our world is currently facing. They are considered to play a crucial role as future leaders in the transition towards a more sustainable society. These leaders need an inherent understanding of the sustainability challenge that they are confronted with. This research explores how sustainability practitioners can use Theory U in order to help younger generations approach sustainability. Both the Framework for Strategic Sustainable Development (FSSD) and Theory U informed this research as they use a systems thinking approach to deal with complexity. A qualitative research approach was chosen, and sixteen semi-structured interviews were conducted. The results revealed seven overarching themes around youth, youth and sustainability, and using Theory U with youth. The findings suggest that Theory U can support sustainability practitioners in working with youth as it offers a strong systems thinking approach, personal development, and connectedness for youth. Complementary with the FSSD’s rigorous approach to sustainability, Theory U offers great potential to youth and sustainability that is yet untapped. In equipping youth at an early age with leadership skills, capacities, and a wider awareness, Theory U can plant the seeds for future sustainability leaders to grow. 

  • 5357.
    Hoël, Miranda
    et al.
    Blekinge Institute of Technology.
    Arifagic, Sedina
    Blekinge Institute of Technology.
    Sjuksköterskestudenters upplevelse av att vårda personer i livets slutskede2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: Livet har ett slut och döden är ett oundvikligt faktum. Årligen uppskattas cirka 20 miljoner människor vara i behov av vård i livets slutskede. Den palliativa vården är en personcentrerad och lindrande vårdform för den sista tiden i livet när behandling av sjukdom inte längre bedöms ge effekt. Vårdandet av personer i livets slutskede väcker mycket känslor hos dem som vårdar och det har visat sig att sjuksköterskestudenter och nyutexaminerade sjuksköterskor upplever bristande kunskap i omvårdnad vid palliativ vård. Det är därför viktigt att belysa sjuksköterskestudenternas upplevelse av att vårda personer i livets slutskede.

    Syfte: Syftet med studien var att belysa sjuksköterskestudenters upplevelse av att vårda personer i livets slutskede.

    Metod: Ett frågeformulär med öppna frågor har genomfört och analyserats med hjälp av Graneheim och Lundmans beskrivning av kvalitativ innehållsanalys.

    Resultat: Analysen resulterade i två huvudkategorier: vikten av att hantera sina känslomässiga reaktioner och behovet av att förstå vikten av omvårdnadsinsatserna. Sjuksköterskestudenterna upplevde att vårda personer i livets slutskede är något meningsfullt uppskattande och utvecklande men beskrev det även som psykiskt tungt, påfrestande och skrämmande. De beskrev att även att omvårdnaden kring personen i livets slutskede skulle formas utifrån personens behov och att de anhöriga skulle inkluderas och känna sig delaktiga. Resultatet visade att sjuksköterskestudenter kände sig osäkra och rädda i att vårda personer i livets slutskede som ledde till att de kunde ta distans.

    Slutsats: Studiens resultat kan leda till ökad kännedom kring sjuksköterskestudenters upplevelse av att vårda personer i livets slutskede för att utveckla och förbättra sjuksköterskeutbildningar i Sverige. Resultatet visar även att det skulle vara betydelsefullt med en obligatorisk kurs i omvårdnad vid palliativ vård för att förbereda sjuksköterskestudenterna i att hantera dessa vårdsituationer och känna sig självsäkra i att vårda personer i livets slutskede.

    Nyckelord: Palliativ vård, sjuksköterskestudent, upplevelse, utbildning, Vård i livets slutskede

  • 5358. Hu, Ganglan
    et al.
    Aurum, Aybüke
    Wohlin, Claes
    Adding Value to Software Requirements? An Empirical Study in the Chinese Software Industry2006Conference paper (Refereed)
  • 5359.
    Hu, Min
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Study of Two Models for Tearing Resistance Assessment Using Essential Work of Fracture Method2008Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The thesis takes an insight look into two different models(two-zone and three-zone models)for describe the deformation and fracture behaviour of the tearing ligament.By earlier works,these two different models based on Essential Work of Fracture approach was proved to be capable for predicting the specific total work of fracture along the tear path across all plastic zones. A comparison of these two models was made based on the results from an early experiment. The investigation was based on two-leg trousers tear specimen with constant pre-crack length. The materials used in this work were PET and a laminate composed of PETG/PET. And a finite element simulation will be presented also to show the stress around the crack tip and the deformation of the tear specimen. The commercial software of ABAQUS will be selected to performance the simulation.

  • 5360.
    Hu, Yan
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Cloud Computing for Achieving Interoperability in Home-based Healthcare2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The care of chronic disease has become the main challenge for healthcare institutions around the world. As the incidence and prevalence of chronic diseases continue to increase, it is a big challenge for traditional hospital-based healthcare to meet requirements of patients. To meet the growing needs of patients, moving the front desk of healthcare from hospital to home is essential. Home-based healthcare for chronic disease involves many different organizations and healthcare providers. Therefore, there are interoperability problems for cooperation among the various organizations and healthcare providers to provide efficient and seamless home-based healthcare. 

    This thesis aims to point out an appropriate technical solution to interoperability problems in home-based healthcare. There are different levels of interoperability, such as pragmatic, semantic and syntactic. We explored alternative solutions specifically for syntactic interoperability. We started to identify the interoperability problems among different healthcare centers by interviews and online surveys. Based on this empirical study, we mainly used two current techniques, namely peer-to-peer (P2P) networks and cloud computing, to design prototypes for sharing healthcare data. Comparing these two techniques, we found the cloud-based solution figured out most of the problems encountered in healthcare interoperability. 

    To identify state of the art, and pinpoint the challenges and possible future directions for applying a cloud-based solution, a systematic literature review was carried out on cloud-based healthcare solutions. Based on the literature reviewed, we suggest a hybrid cloud model, with access controls and techniques for securing data, could be an acceptable solution for home-based healthcare in the future. This cloud model would work as a community for both healthcare providers and recipients, as well as other stakeholders, such as family members and other patients with similar symptoms. Then we conducted a questionnaire study with healthcare recipients and interviewed healthcare providers to gather the requirements for the design of the community. Based on the concept of ‘community’ from the activity theory model, we designed a prototype to demonstrate our proposed solution.   

    Finally, we proposed the conceptual hybrid cloud model. In our hybrid cloud model, hospitals and primary healthcare centers could continue using their own databases as private clouds. For home-based healthcare data, we argued, the best approach is to store and process the data in public clouds. Healthcare recipients, as the owners of their health data in public clouds, should then decide who can access their data and the conditions for sharing. To evaluate this model, we conducted a two-step case study of diabetes healthcare in Blekinge, Sweden. We found that our improved hybrid cloud model will be feasible in the future for home-based healthcare, and it will benefit both healthcare providers and recipients.

    To apply this model in practice, we suggest that a professional IT healthcare education team should be created to support both healthcare providers and recipients.

  • 5361.
    Hu, Yan
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Cloud Computing for Interoperability in Home-Based Healthcare2014Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The care of chronic disease has become a main challenge for healthcare institutions around the world. As the incidence and prevalence of chronic diseases continue to increase, traditional hospital-based healthcare is less able to meet the needs of every patient. Treating chronic disease heavily depends on the patient’s daily behaviors, so patient-centered healthcare is encouraged. To improve patients’ quality of life, moving the base of healthcare from hospital to home is imperative. Home-based chronic disease care involves many different healthcare organizations and healthcare providers. Therefore, interoperability is a key approach to provide efficient and convenient home-based healthcare services. This thesis aims to reveal the interoperability issues in the current healthcare system and to point out an appropriate technical solution to overcome them. We start with collecting perspectives from both healthcare providers and healthcare recipients through interviews and online surveys to understand the situations and problems they face. In our research study, we mainly use two current techniques―peer-to-peer (P2P) networks and cloud computing―to design prototypes for sharing healthcare data, developing both a P2P-based solution and a cloud-based solution. Comparing these two techniques, we found the cloud-based solution covered most of the deficiencies in healthcare interoperability. Although there are different types of interoperability, such as pragmatic, semantic and syntactic, we explored alternative solutions specifically for syntactic interoperability. To identify the state of the art and pinpoint the challenges and possible future directions for applying a cloud-based solution, we reviewed the literature on cloud-based eHealth solutions. We suggest that a hybrid cloud model, which contains access controls and techniques for securing data, would be a feasible solution for developing a citizen-centered, home-based healthcare system. Patients’ healthcare records in hospitals and other healthcare centers could be kept in private clouds, while patients’ daily self-management data could be published in a trusted public cloud. Patients, as the owners of their health data, should then decide who can access their data and the conditions for sharing. Finally, we propose an online virtual community for home-based chronic disease healthcare―a cloud-based, home healthcare platform. The requirements of the platform were mainly determined from the responses to an online questionnaire delivered to a target group of people. This platform integrates healthcare providers and recipients within the same platform. Through this shared platform, interoperability among different healthcare providers, as well as with healthcare recipients’ self-management regimens, could be achieved.

  • 5362.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, School of Computing.
    Afzal, Javed
    Blekinge Institute of Technology, School of Computing.
    Achieving eHealth interoperability Via peer-to-peer communication Using JXTA Technology2010Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    eHealth is an emerging area that boosts up with advancement in Information and Communication Technology (ICT). Due to variety of eHealth solutions developed by different IT firms with no proper shared standards, interoperability issue is then raised. Blekinge County healthcare organizations use two different systems MAGNA CURA and SYStem Cross. The two systems work well in their own scope. But these systems often need to communicate and coordinate for exchange of patients’ information which leads to the problem of interoperability. The aim of this research study is to provide fast and reliable peer-to-peer solution for exchange of patient information so as to achieve interoperability among healthcare organizations. This proposed solution is tested as a middleware between MAGNA CURA and SYStem Cross currently used by Blekinge County healthcare organizations. A qualitative approach including in-depth literature review and a semi-structured face-to-face interview has been used for understanding the context of research problem. We have tested our approach through an executable prototype. The prototype is implemented using JXTA platform. We have learned that Blekinge healthcare is decentralized and heterogonous in nature. For such kind of environment, peer-to-peer communication approach is suggested. According to the test result, the suggested syntactic level interoperability between the two mentioned systems has been achieved.

  • 5363.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    A Cloud Model for Interoperable Home-based Chronic Diseases Healthcare2014Conference paper (Refereed)
    Abstract [en]

    Traditional hospital based care cannot meet all the needs of chronic diseases care in home, especially for elderly people. A new approach applying eHealth that supports interoperable health care is required. To find a way to meet the new needs, we firstly carried out a questionnaire to analyze current problems and needs in chronic disease care. Then we compared possible technical solutions and proposed a cloud model for the identified problems. This model would help chronic patients self-record and control their daily care data, communicate with other patients who have the similar situation. The proposed solution could be also used to integrate data from different healthcare providers for a cooperative work, namely in this paper as Home-based Chronic Diseases Healthcare (HCDH).

  • 5364.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    A systematic literature review of cloud computing in eHealth2014In: Health Informatics-An International Journal (HIIJ), ISSN 2319-2046, Vol. 3, no 4, p. 11-20Article in journal (Refereed)
    Abstract [en]

    Cloud computing in eHealth is an emerging area for only few years. There needs to identify the state of the art and pinpoint challenges and possible directions for researchers and applications developers. Based on this need, we have conducted a systematic review of cloud computing in eHealth. We searched ACM Digital Library, IEEE Xplore, Inspec, ISI Web of Science and Springer as well as relevant open-access journals for relevant articles. A total of 237 studies were first searched, of which 44 papers met the Include Criteria. The studies identified three types of studied areas about cloud computing in eHealth, namely (1) cloud-based eHealth framework design (n=13); (2) applications of cloud computing (n=17); and (3) security or privacy control mechanisms of healthcare data in the cloud (n=14). Most of the studies in the review were about designs and concept-proof. Only very few studies have evaluated their research in the real world, which may indicate that the application of cloud computing in eHealth is still very immature. However, our presented review could pinpoint that a hybrid cloud platform with mixed access control and security protection mechanisms will be a main research area for developing citizen centred home-based healthcare applications.

  • 5365.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Building up a Virtual Community for Home-Based Chronic Diseases Healthcare2014In: 2014 IEEE 2nd International Workshop on Usability and Accessibility Focused Requirements Engineering, IEEE , 2014Conference paper (Refereed)
    Abstract [en]

    With the development of Internet, social networks get more and more popular, it brings us an idea of designing a virtual community for home-based chronic diseases healthcare. In this paper, we conduct a questionnaire to gather the requirements of the community and describe them with user stories. Afterwards, a conceptual prototype is developed based on the requirements. The proposed virtual community involves healthcare providers, healthcare recipients and other people relevant to the home-based healthcare into one platform. It will solve the interoperability problems of current healthcare systems, as well as provide a technical solution of home-based healthcare.

  • 5366.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Eriksén, Sara
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Lundberg, Jenny
    A hybrid cloud model for diabetes home-based care: a case study for perceived future feasibilityIn: Article in journal (Refereed)
  • 5367.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Lundberg, Jenny
    Linnaeus University, SWE.
    Eriksén, Sara
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    A Virtual Community Design for Home-Based Chronic Disease Healthcare2016In: Lecture Notes in Computer Science / [ed] Seyff N.,Ebert A.,Humayoun S.R.,Perini A.,Barbosa S.D.J.,Seyff N., Springer Publishing Company, 2016Conference paper (Refereed)
    Abstract [en]

    The internet based social network has been applied to serve many social functions, such as democratic decision making, knowledge sharing, educa‐ tion, and healthcare. In this paper, we provide a prototype of virtual community designed for home-based chronic diseases healthcare. We studied the concept “community” from the activity theory model in order to design the prototype with a solid theoretical base. Then we conducted a questionnaire from healthcare recipients and interviewed healthcare providers to gather the requirements for the design of the community. With some user stories we described the requirements as use cases for our design and a conceptual prototype is built based on the requirements. This virtual community servers as a shared platform for all the stakeholders who are engaged in the healthcare activity. With this shared community platform, the interoperability problems of current healthcare systems can be moderated

  • 5368.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Eriksén, Sara
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Lundberg, Jenny
    Future Directions of Applying Healthcare Cloud for Home-based Chronic Disease Care2017Conference paper (Refereed)
    Abstract [en]

    The care of chronic disease has become the main challenge for healthcare institutions around the world. To meet the growing needs of patients, moving the front desk of healthcare from hospital to home is essential. Recently, cloud computing has been applied to healthcare domain; however, adapting to and using this technology effectively for home-based care is still in its initial phase. We have proposed a conceptual hybrid cloud model for home-based chronic disease care, and have evaluated its future feasibility by a case study of diabetes care in Blekinge, Sweden. In this paper, we discuss some possible future opportunities and challenges to apply this cloud model with the huge population for home-based chronic diseases care. To apply this model in practice, a professional IT healthcare education team is needed for both healthcare providers and healthcare recipients. For home-based healthcare, a monitoring system with an automatic alarm to healthcare providers is also necessary in some cases. Also, how to record and integrate excises data through wearable devices in a cloud should be considered. Given the high demand, sharing medical images through the cloud should be another research focus.

  • 5369.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, School of Computing.
    Lu, Fangjie
    Khan, Israr
    Bai, Guohua
    Blekinge Institute of Technology, School of Computing.
    A Cloud Computing Solution for Sharing Healthcare Information2012Conference paper (Refereed)
    Abstract [en]

    In recent years, sharing healthcare information becomes one of essential requirements of e-health development. To cover this gap, different solutions are presented through different technologies. In this paper, we proposed a cloud computing solution for sharing healthcare information based on Google App Engine (GAE). With the experiment test results, we achieve interoperability among different healthcare centers and between healthcare providers and receivers with high stability and availability.

  • 5370.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Peng, Cong
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Sharing Health Data Through Hybrid Cloud For Self-Management2015In: 2015 IEEE International Conference on Multimedia & Expo Workshops (ICMEW), IEEE, 2015Conference paper (Refereed)
    Abstract [en]

    Nowadays, patient self-management is encouraged in home-based healthcare, especially for chronic disease care. Sharing health information could improve the quality of patient self-management. In this paper, we introduce cloud computing as a potential technology to provide a more sustainable long-term solution compared with other technologies. A hybrid cloud is identified as a suitable way to enable patients to share health information for promoting the treatment of chronic diseases. And then a prototype on the case of type 2 diabetes is implemented to prove the feasibility of the proposed solution.

  • 5371.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Sundstedt, Veronica
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Exploring Biometrics as an Evaluation Technique for Digital Game Addiction Prevention2018In: Journal of Behavioral Addictions, ISSN 2062-5871, E-ISSN 2063-5303, Vol. 7, p. 15-15Article in journal (Other academic)
  • 5372.
    Hua, Xiaoben
    et al.
    Blekinge Institute of Technology, School of Engineering.
    Yang, Yuxia
    Blekinge Institute of Technology, School of Engineering.
    A Fusion Model For Enhancement of Range Images2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    In this thesis, we would like to present a new way to enhance the “depth map” image which is called as the fusion of depth images. The goal of our thesis is to try to enhance the “depth images” through a fusion of different classification methods. For that, we will use three similar but different methodologies, the Graph-Cut, Super-Pixel and Principal Component Analysis algorithms to solve the enhancement and output of our result. After that, we will compare the effect of the enhancement of our result with the original depth images. This result indicates the effectiveness of our methodology.

  • 5373.
    HUANG, JING
    Blekinge Institute of Technology, School of Planning and Media Design.
    Walkability in Public Space: An alley-oriented study towards pedestrian-friendly2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    As a by-product of speedy urbanization and economic distribution, the nature of public life is changing with the process of privatization. "Public spirit" is losing somehow and there are less necessities for us walkers to use the public space. Not just carrying vehicles and sidewalks but also the main part of public space, the streets, serves as the borders as well as the vital organs. However the priority access to vehicles has diminishing this function with the possibility as "public spaces" for multiple human activities. Compared to macro-spaces, the conventional character of micro-spaces have given a much vital and flexible experience to walkable distance. An efficient city which is friendly to people provides interconnected networks that creates different scale of public spaces, accordingly meet different levels of human needs. Alleys and narrow lanes used to dominate the urban spaces before the cars do. They've proved the circumstance that they serves more vibrant and livable spaces that offer social and economic benefits, including walkability and connectivity, and better living experience. With these considerations, this paper will give the thinking about walkable neighborhood based on the theory of friendly city. Meanwhile, as the most represented developing city, Beijing is facing the serious problem of declining on-street activities and automobiles vs. walking conflict. So the question is: how to rebuild an area that carries heavy traffic under the framework of Friendly city, with a special focus on walkability in the context of Beijing? In other words is, how to create a pedestrian-friendly city that also facing towards to the future. The aim of this paper is to seek a walkable solution to reclaim back the vital life to Beijing, with an ultimate expectation towards friendly city. Since this is a scientific paper deals with walkability, a scientific method will be must. Triangulation of theory review, a particular case study, and site observation will together contribute to the structure of methodology. The theory review covers an elaboration on social life in public spaces, a study of friendly theory from two different literature under the framework of New Urbanism. After that a case study on recent sustainable project--Nordhavn in Copenhagen--will be made to complement the whole theory system. An observation and comparison of the site will followed up in order to get better understanding from the dimension of walkability and prepare for next step work. In design part, a complex proposal and solution in applying walkable strategies to a car-dominated place will try to answer the question which came up at the beginning. In the end the author will give a neutral evaluation towards design outcome incorporate with the conclusion of the walkability in social, ecological, economic and healthy aspects.

  • 5374.
    Huang, Simon
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Load time optimization of JavaScript web applications2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background.

    Websites are getting larger in size each year, the median size increased from 1479.6 kilobytes to 1699.0 kilobytes on the desktop and 1334.3 kilobytes to 1524.1 kilobytes on the mobile. There are several methods that can be used to decrease the size. In my experiment I use the methods tree shaking, code splitting, gzip, bundling, and minification.

    Objectives.

    I will investigate how using the methods separately affect the loading time and con- duct a survey targeted at participants that works as JavaScript developers in the field.

    Methods.

    I have used Vue for creating a website and ran Lighthouse tests against the website. All this within two Docker containers to make the reproducibility easier. Interviews with JavaScript developers were made to find out if they use these methods in their work.

    Results.

    The best result would be to use all of the methods; gzip, minification, tree shaking, code splitting, and bundling in a combination. If gzip is the only option available for the developer to use, we can see around 60% decrease in loading time. The inter- views showed that most developers did not use or did not know of tree shaking and code splitting. Some frameworks have these methods built in to work automatically, therefor the developers does not know that it is being utilized.

    Conclusions.

    Since tree shaking and code splitting are two relatively new techniques, there is not much scientific measured values available. From the results, we can give the conclusion that using all of the mentioned methods will give the best result in loading time. All of the methods will affect the loading time, and only using gzip will affect it with a 60% decrease.

  • 5375. Huang, Yayu
    et al.
    Hu, Xiang Ping
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Shen, Yujie
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Liao, Taohong
    Method of obtaining dynamic stress intensity factor by measuring crack mouth opening displacement on a 3-point bending specimen2012In: Lecture Notes in Electrical Engineering, Jiaozuo, Henan: Springer , 2012, Vol. 138, p. 1269-1275Conference paper (Refereed)
    Abstract [en]

    This paper focuses on how to obtain the Dynamic Stress Intensity Factor by measuring Crack Mouth Opening Displacement on a pre-cracked 3-Point Bending Specimen. During the experiments, one uses impactor to hit on a pre-crack 3-Point Bending Specimen and at the same time uses a high-speed camera to take a set of photos of the crack. Crack Mouth Opening Displacement can then be measured from these photos. According to the relationship of J integral, Crack Open Mouth Displacement and the Dynamic Stress Intensity Factor, the Dynamic Stress Intensity Factor could be obtained. This result could be useful for guiding the practical engineering design.

  • 5376. Huang, Yayu
    et al.
    Hu, Xiangping
    Fracture mechanics theoretical modelling and FEM analysis of 3-Point Bending Specimen suffering cyclic loads2011Conference paper (Refereed)
    Abstract [en]

    Fracture mechanics theoretical modelling and Finite Element Method analysis of a pre-cracked 3-Point Bending Specimen (3PBS) have been conducted in this paper. Using the equivalent system of the specimen, fracture mechanical characteristics have been analyzed and the theoretical Dynamic Stress Intensity Factor (DSIF) is obtained later and used together with the Pairs theorem to analyze the fatigue life time of the specimen. Based on the simulations from ABAQUS, dynamic characteristics of the pre-cracked 3PBS are obtained and verified. The results are further analyzed and discussed with special concern on fracture mechanics characteristics of the material and will provide a guideline for further research and practical design

  • 5377. Huang, Yayu
    et al.
    Hu, XiangPing
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Liao, Taohong
    Fracture mechanics analysis of the Dynamic Stress Intensity Factor of 3-Point Bending Specimen suffering cyclic loads2012In: Applied Mechanics and Materials, Jiaozuo, 2012, Vol. 143-144, p. 503-507Conference paper (Refereed)
    Abstract [en]

    Fracture mechanics analysis of the Dynamic Stress Intensity Factor of a pre-cracked 3-Point Bending Specimen suffering cyclic loads has been studied. Using the theoretical equivalent system of the pre-cracked 3-Point Bending Specimen, the Dynamic Stress Intensity Factor could be obtained theoretically. The finite element method was then applied to study the dynamic behaviors of the Dynamic Stress Intensity Factor under different cyclic loads' conditions using the standard software ABAQUS. The results have also been analyzed and discussed, which provided a deeper view for the fracture characteristics of the materials and could be used to guide further researches and practical engineering design.

  • 5378. Huang, Yayu
    et al.
    Hu, Xiangping
    Liao, Taohong
    Fracture mechanics mathematical modelling for Dynamic Stress Intensity Factor of 3-Point Bending Specimen2011Conference paper (Refereed)
    Abstract [en]

    This paper emphasizes on the analysis of fracture mechanical characteristics of 3-Point Bending Specimen suffering driving force. By analyzing the structural characteristics of the 3-Point Bending Specimen, the equivalent mathematical model mass-damping-spring system has been formulated. The variation of parameters method is then used to solve the corresponding second order differential equation and find the general analytical formula for the Dynamic Stress Intensity Factor. This analytical formula for Dynamic Stress Intensity Factor will be useful for the further researches and practical engineering design and applications in fracture mechanical field

  • 5379.
    hudji, mahmoud
    Blekinge Institute of Technology.
    Effektivisering av produktflöde vid Dynapac AB2018Independent thesis Basic level (university diploma), 12 credits / 18 HE creditsStudent thesis
  • 5380.
    Hudson, Giselle
    et al.
    Blekinge Institute of Technology, School of Management.
    Khlynovskaya, Yelena
    Blekinge Institute of Technology, School of Management.
    The role of learning orientation and customer relation on company performance: Empirical evidence from telecom industry in Kazakhstan2012Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Purpose The purpose of this thesis is to explain how and under what conditions learning orientation of the customer relations staff of GSM Kazakhstan (Kcell) is linked to the performance of the company. The purpose of this thesis is two-fold: First we proposed and test how learning orientation affects organizational commitment of the company through developing staff competencies. Secondly propose and test how relationship between CC and the company‘s performance can be formulated. Design and methodology The methods and research design will guide readers through the steps taken to complete the contained thesis. These steps will also help other researchers to be able to reproduce this research by following the path outlined in the methods section. All measures, definitions and operationalization are based on earlier research. The rationale for the research approach was carefully considered and explained so that readers of this thesis can obtain a clear appreciation of the objective of this research. Findings We suggested a model including four hypotheses. First we suggested Learning Commitment have a positive (+) effect on Company Commitment. We did not find support for this relationship. Secondly, we proposed Shared Values have a positive (+) effect on Company Commitment. This hypothesis was also rejected. Third, we proposed Open Mindedness have a positive (+) effect on Company Commitment. Here we found strong significant support. As expected we also found support for our fourth hypothesis that is Company Commitment have a positive (+) effect on Performance of the company. Our findings thus mean that performance is strongly related to commitment, which depends on the construct of open mindedness.

  • 5381.
    Huete, Olga Martinez
    Blekinge Institute of Technology, School of Management.
    Är prestation och perfektion moderna ideal?2010Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Det individualistiska samhället kännetecknas av ett ökat ansvar för individen att utforma sitt liv och sin framtid. Prestation och perfektion är intressanta fenomen direkt relaterade till valmöjlighet. Kan dessa fenomen till och med uppfattas som ideal i det individualistiska samhället? Syftet med studien har varit att undersöka hur det mänskliga beteendet förhåller sig till de samhälliga idealen som markerar perfektion och som utmanar individen att göra sitt yttersta. Studien är explorativ och använder sig av en enkät som undersökningsmetod. Den tar hjälp av en mer kvantitativ forskningsansats i form av statistisk för att nå syftet och kunna svara på frågeställningen. Resultatet visar en tendens enligt dessa linjer, där det är upp till själva individen att utforma sitt liv och det viktigast av allt. Studien visar att perfektion och vikten av prestation är indikationer på att dessa fenomen kan uppfattas som moderna ideal. Vidare forskning skulle behövas i form av experiment, eller jämförande ansatser av mer kollektivistiska samhällen.

  • 5382.
    Hugosson, Marina
    et al.
    Blekinge Institute of Technology, Department of Business Administration and Social Science.
    Paulsson, Anette
    Blekinge Institute of Technology, Department of Business Administration and Social Science.
    Kan företag hantera ekonomistyrning med balans och fokus?2003Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Bakgrund: Många företag tillämpar olika metoder för att styra sin verksamhet. Det grundläggande för företags utveckling är att använda en ekonomistyrning som passar för företagets verksamhet samt att ekonomistyrningssystemet tillämpas på ett optimalt sätt för att uppnå de bestämda mål som företaget formulerat. För att företag skall kunna uppnå en ekonomistyrning som fungerar på ett optimalt sätt, krävs det att företag kan hantera balans och fokus i både tid, rum och aspekter. Problem: Det problem som fångat vårt intresse och som vi vill undersöka närmare är om företag kan hantera balans och fokus inom sin ekonomistyrning. I den dynamiska omgivning som vi lever i krävs det att företag har en fungerande ekonomistyrning. Det kräver bland annat en planering av verksamheten på både lång och kort sikt samt att det görs på ett sätt så att både balans och fokus kan hanteras inom deras ekonomistyrning. Således är frågan om företag kan hantera både balans och fokus inom sin ekonomistyrning och vad är det för faktorer som gör att de klarar alternativt inte klarar att hantera balans och fokus. Syfte: Syftet med uppsatsen är att undersöka om företag kan hantera ekonomistyrning med balans och fokus. Metod: Vi har arbetat efter den kvalitativa forskningsmetoden för att undersöka vårt problem och försöka förstå dess fenomen. Vårt undersökningsmaterial har samlats in genom intervjuer. Utöver vårt intervjumaterial har vi som underlag för vårt kandidatarbete använt oss av material som tidskrifter och litteratur inom ämnesområdet ekonomistyrning. Slutsats: Det som tydligt framkommer i vår undersökning är att företag som kan hantera både balans och fokus inom sin ekonomistyrning tillämpar ett ekonomistyrningssystem som hjälper företag att beakta de faktorer som vi anser är viktiga för att de skall kunna anpassa, förbättra och utveckla sin verksamhet efter omgivningens krav. De företag som kan hantera balans och/eller fokus idag har ingen garanti för att den skall kvarstå för all framtid. Det gäller att de företagen hela tiden följer upp verksamheten, motiverar medarbetarna, samordnar för att uppnå måluppfyllelse samt bemöter förändringar på ett positivt sätt för att upprätthålla sin balans och fokus inom ekonomistyrningen. Även det företag som inte kan hantera balans och fokus idag inom sin ekonomistyrning kommer troligtvis att kunna hantera det om företaget fortsätter sitt arbete med att förbättra och utveckla sin verksamhet samt motivera medarbetarna.

  • 5383.
    Huhtala, Sondre
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Lund, Sebastian
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Trovärdighet och Verisimilitude: Uppfattning av det sanna och verkliga inom spel2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Believability within fictional worlds is something many strive for, but how does one go about to achieve it? Movies and literature use the concept of verisimilitude to define a work of fiction’s appearance of being true or real and with this, also define how believable it is. Originating from Plato and Aristotle's term mimesis, which refers to the imitation of nature, the term verisimilitude developed into its current form to be used as a way of analysis to better understand how believability may be achieved. To do this, the term points to how well an audience can relate the fictional world to our own world, for if this is done well, it instantly becomes more believable.

    The term verisimilitude is mostly used within the works of movies and literature and as such, there is very little research to be found in relation to its use in video games. We argue that the incorporation of verisimilitude within video game design can prove to be a valuable tool to aid in how we design towards more believable worlds in video games. We will in this bachelor thesis inquire the help of Anneli Lethsalos studies on verisimilitude within movies and genres build an understanding of how verisimilitude is used within the films.We also inquire help from Kamal Bhatts studies on believability within computer games to research how believability in video-game differ from other mediums and what qualities a game needs in order to be seen as believable.  With this newfound understanding we then set out to design our own game environment with verisimilitude as a design perspective. With this we hope to establish a ground to how one can design around believability in video-games.

  • 5384.
    Hulenvik, Markus
    Blekinge Institute of Technology, School of Technoculture, Humanities and Planning.
    Vision Araby/Dalbo: Förslag på åtgärder i den offentliga miljön för att uppnå ökad trygghet och attraktivitet2008Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [sv]

    Endast en kilometer från Växjö Centrum ligger ett bostadsområde, Araby/Dalbo, tillkommet under 1960- och 70-talets s.k. Miljonprogram. Miljonprogrammet var ett politiskt försök till att bygga bort bostadsbristen, men ledde till många av de bostadsområden som idag kritiseras för att vara segregerade med monotona och otrivsamma miljöer. Innemiljöerna var vanligtvis välplanerade och funktionella lägenheter med anpassning till solljus och luftighet, men utemiljön blev ofta eftersatt pga. rationella byggmetoder. Även Araby/Dalbos miljöer har fått utstå kritik och tilldelats ett rykte som oattraktivt och otryggt att vistas i. Merparten av de boende i området trivs dock, men det finns relativt stora sociala problem i området. Samtidigt är områdets skamfilade rykte samt dess isolerande utformning ett problem som gör att få folk från övriga Växjö besöker Araby/Dalbo. Att skapa ett attraktivt och tryggt område för att i sin tur ändra Araby/Dalbos rykte hos allmänheten har därmed varit en primär uppgift i detta arbete. Med hjälp av analys av områdets offentliga miljöer samt teorier kring brottsprevention genom den byggda miljön föreslås en rad åtgärder för att uppnå en säker och tilltalande utemiljö i Araby/Dalbo. Bl.a. föreslås åtgärder i utformningen av gårdar, fasader, stråk och grönstruktur samt nya bostäder och målpunkter i området. Att genomföra de föreslagna åtgärderna är relativt enkelt. Men det räcker inte med enbart fysiska åtgärder i den offentliga miljön för att lyfta Araby/Dalbo. Stadsdelen har idag sociala problem i form av hög arbetslöshet, segregation och höga ohälsotal. Insatserna för Araby/Dalbos utveckling bör därför ske på bred front med ett helhetsgrepp på området innefattande både fysiska och sociala åtgärder. De första stegen i detta arbete har tagits i och med Växjö kommuns tecknande av s.k. lokalt utvecklingsavtal med staten för att stärka samordningen av sociala insatser för att minska segregationen. Därför krävs nu också en plan för hur den fysiska utformningen i området bör se ut och utvecklas. Detta arbete kan förhoppningsvis bli start- skottet på ett långsiktigt förändringsarbete och ligga till grund för Araby/Dalbos fortsatta utveckling mot att bli en omtyckt och attraktiv stadsdel i Växjö.

  • 5385.
    Hult, Johan
    et al.
    Blekinge Institute of Technology, School of Management.
    Svensson, Daniel
    Blekinge Institute of Technology, School of Management.
    Balanced Scorecard i svenska kommuner2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    Syfte: Syftet med vår studie är att genomföra en kvantitativ totalundersökning av Sveriges kommuner och se varför de tillämpar Balanced Scorecard. Studien ska även granska utbredningen av Balanced Scorecard, dess nytta samt hur det används. Metod: I vår studie har vi valt att göra en kvantitativ totalundersökning. Studien har utförts med hjälp av en enkätundersökning som har skickats ut via e-post till samtliga Sveriges kommuner. Vi har också gjort en litteraturstudie för att få kunskap om relevanta teorier inom ämnesområdet. Slutligen har en sammanställning av enkäten genomförts i Netigate och Excel, samt en analys av resultatet från enkäten. Slutsats: Balanced Scorecard är väl känt bland de svenska kommunerna och de har tagit det till sig i relativt hög utsträckning, 36 procent av kommunerna använder styrkort i hela eller delar av sin kommun. Kund- och finansiellaperspektivet är de vanligaste men även medarbetarperspektivet är vanligt förekommande. De vanligaste nyckeltalen är medborgar-nöjd-index, årets resultat, sjukfrånvaro samt nöjd medarbetarindex. Anmärkningsvärt var att flera kommuner inte hade några it-lösningar alls. Den främsta anledningen till varför kommunerna valt att använda sig av Balanced Scorecard är att de vill effektivisera den kommunala verksamheten. Trots att Balanced Scorecard används är det vanligt bland kommunerna att även använda sig av traditionella planer för att styra verksamheten. De flesta av kommunerna anser sig nöjda med deras Balanced Scorecard och tycker att det medfört någon form av framgång.

  • 5386. Hult, Tommy
    Novel Applications of Space-Time Processing for Wireless Systems2006Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Space-time processing techniques have emerged as one of the most promising areas of research and development in wireless communications. Space-time processing signifies the signal processing performed on a system consisting of several antenna elements, whose signals are processed adaptively in order to exploit both the spatial (space) and temporal (time) dimensions of the radio channel. Space-time processing techniques can be applied at the transmitter, the receiver or both. The use of space-time signal processing can significantly improve average signal power, mitigating fading, and reduce inter-symbol interference and co-channel interference. This can significantly improve capacity, coverage and quality of wireless systems. In this thesis we expand the scope of space-time processing by proposing novel applications in wireless communications. These include the reduction of possibly harmful electromagnetic radiation from mobile phones, enhancing link quality for Bluetooth links in indoor office environments, and increasing the spectral efficiency of satellite communication systems. Several studies have been conducted on the effects of radiation from hand held mobile phones. The amount of radiation emitted from most mobile phones is minute, but given the close proximity of the phone to the head it might be possible for the radiation to cause harm. In Part I, we suggest the use of adaptive signal processing algorithms combined with a MIMO (multiple-input multiple output) antenna system to decrease the electromagnetic radiation inside a certain volume in space (e.g. the the human head). In addition, we investigate the impact of MIMO antenna parameters, carrier frequency and power constraint on the performance of the system. Over the last decade there has been an explosive growth in the use of wireless mobile communications. Today we find users with mobile phones, wireless PDA's, MP3 players, and wireless headphones to connect to these devices. In Part II, we investigate the wave propagation effects of a short-range wireless device, such as the Bluethooth technology. Specifically, we assess the fading phenomenon for Bluetooth link in indoor office environment by simulation of different propagation scenarios, and use measurement results to confirm our findings. In addition, we investigate the improvement in performance resulting from receiver diversity gain of a system employing multiple receive antennas with various combining techniques. The need for high-speed, high-quality bandwidth efficient mobile communications is constantly increasing. In Part III, we address the potential gain of using MIMO antenna system in combination with OFDM (orthogonal frequency division multiplexing) in order to increase the bandwidth efficiency in satellite communication systems. In particular, we consider the increase in channel capacity that is possible by exploiting satellite and polarization diversity. In addition we investigate the effect of using different compact MIMO polarization antenna configurations and power control on the information theoretic capacity of the total transmission channel of the satellite system.

  • 5387. Hult, Tommy
    Space-Time Processing Applications for Wireless Communications2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Wireless mobile communication networks are rapidly growing at an incredible rate around the world and a number of improved and emerging technologies are seen to be critical to the improved economics and performance of these networks. The technical revolution and continuing growth of mobile radio communication systems has been made possible by extraordinary advances in the related fields of digital computing, high-speed circuit technology, the Internet and, of course, digital signal processing. Improved third generation (3G) and future generation wireless communication systems must support a substantially wider and enhanced range of services with respect to those supported by second generation and basic 3G systems. The never-ending quest for such personal and multimedia services, however, demands technologies operating at higher data rates and broader bandwidths. This combined with the unpredictability and randomness of the mobile propagation channel has created many new technically challenging problems for which innovative, adaptive and advanced signal processing techniques may offer new and better solutions. Space-time processing techniques have emerged as one of the most promising areas of research and development in wireless communications for the efficient utilization of the physical mobile radio propagation channel. Space-time processing signifies the signal processing performed on a system consisting of several antenna elements, whose signals are processed adaptively in order to exploit both the spatial (space) and temporal (time) dimensions of the radio channel. This can significantly improve the capacity, coverage, quality and energy efficiency of wireless systems. This thesis expands the scope of space-time processing by proposing novel applications in wireless communication systems. These include the reduction of possibly harmful electromagnetic radiation from mobile phones, enhancing the quality of Bluetooth links in indoor office environments, increasing the spectral efficiency of satellite and the novel high altitude platforms (HAPs) communication systems, enhancing the coverage and capacity of integrated multiple-HAP 3G systems, and improving the energy efficiency of cooperative wireless sensor networks. The performance of these systems is assessed by theoretical analysis, by computer simulations under a range of propagation environments including realistic channel models, advanced commercial electromagnetic modeling software, and a proposed novel multi-channel simulator suitable for various space-time applications.

  • 5388. Hult, Tommy
    WCDMA Uplink Interference Assessment from Multiple High Altitude Platform Configurations2008In: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, Vol. vol. 2008, no Special Issue on Advanced Communication Techniques and Applications for High-Altitude PlatformsArticle in journal (Refereed)
    Abstract [en]

    We investigate the possibility of multiple high altitude platform (HAP) coverage of a common cell area using a wideband code division multiple access (WCDMA) system. In particular, we study the uplink system performance of the system. The results show that depending on the traffic demand and the type of service used, there is a possibility of deploying 3-6 HAPs covering the same cell area. The results also show the effect of cell radius on performance and the position of the multiple HAP base stations which give the worst performance.

  • 5389. Hult, Tommy
    et al.
    Falletti, Emanuela
    Mohammed, Abbas
    Sellone, Fabrizio
    Multi-antenna Channel Model for Space-Polarization Systems2007Conference paper (Refereed)
  • 5390. Hult, Tommy
    et al.
    Falletti, Emanuela
    Mohammed, Abbas
    Sellone, Fabrizio
    The Impact of Depolarizing Effects on a Multiple HAP System Employing Polarization Diversity2007Conference paper (Refereed)
  • 5391. Hult, Tommy
    et al.
    Grace, David
    Mohammed, Abbas
    WCDMA Capacity and Coverage Enhancement from Multiple High Altitude Platform Configuration2007Conference paper (Refereed)
  • 5392. Hult, Tommy
    et al.
    Mohammed, Abbas
    A Combined Satellite Diversity and Compact MIMO Antenna Configurations for High Data Rate Communications2007Conference paper (Refereed)
  • 5393. Hult, Tommy
    et al.
    Mohammed, Abbas
    Active Signal Processing Algorithms for Controlling Electromagnetic Fields: a Tutorial2008Conference paper (Refereed)
  • 5394. Hult, Tommy
    et al.
    Mohammed, Abbas
    Active Suppression of Electromagnetic Fields2004Conference paper (Refereed)
  • 5395. Hult, Tommy
    et al.
    Mohammed, Abbas
    Application of Space-Time Signal Processing and Active Control Algorithms for the Suppression of Electromagnetic Fields2011In: Applied Signal and Image Processing: Multidisciplinary Advancements / [ed] Qahwaji, Rami; Green, Roger; Hines, Evor, Hershey: IGI Global , 2011, p. 45-60Chapter in book (Refereed)
    Abstract [en]

    Several studies have been conducted on the effects of radiation on the human body. This has been especially important in the case of radiation from hand held mobile phones. The amount of radiation emitted from most mobile phones is very small, but given the close proximity of the phone to the head it might be possible for the radiation to cause harm. The suggested approach involves the use of adaptive active control algorithms and a full space-time processing system setup (i.e. multiple antennas at both the transmitter and receiver side or MIMO), with the objective of reducing the possibly harmful electromagnetic radiation emitted by hand held mobile phones. Simulation results show the possibility of using the adaptive control algorithms and MIMO antenna system to attenuate the electromagnetic field power density.

  • 5396. Hult, Tommy
    et al.
    Mohammed, Abbas
    Assessment of a HAP Diversity System Employing Compact MIMO-Tetrahedron Antenna2007Conference paper (Other academic)
  • 5397. Hult, Tommy
    et al.
    Mohammed, Abbas
    Assessment of Multipath Propagation for a 2.4 GHz Short-Range Wireless Communication System2007Conference paper (Refereed)
    Abstract [en]

    In this paper we assess the multipath propagation effects of a short-range wireless device operating at 2.4 GHz in an indoor office environment. The investigations are carried out using FEM simulations and measurement trials for NLOS and LOS propagation scenarios. The FEM simulations will also be used for assessing the influence on propagation when doors are opened or closed. Finally, we investigate a single-input multiple-output (SIMO) antenna receive diversity system utilizing different combining techniques to improve the performance over a fading radio channel in a NLOS propagation environment. Simulation results show that a substantial diversity gain would be achieved by using this system. © 2007 IEEE

  • 5398. Hult, Tommy
    et al.
    Mohammed, Abbas
    CAPACITY OF A SATELLITE DIVERSITY SYSTEM EMPLOYING MULTIPLE POLARIZATIONS2006Conference paper (Refereed)
    Abstract [en]

    In this paper we address the potential gain of using compact MIMO antenna array configurations in conjunction with satellite diversity techniques in order to increase the data rates in satellite communication systems. Simulation results show that by exploiting the additional multiple polarization channels and satellite diversity we can achieve considerable capacity gain compared to the single satellite case.

  • 5399. Hult, Tommy
    et al.
    Mohammed, Abbas
    CAPACITY OF MULTIPLE HAP SYSTEM EMPLOYING MULTIPLE POLARIZATIONS2006Conference paper (Refereed)
    Abstract [en]

    In this paper we investigate the potential increase in capacity of HAP (High Altitude Platforms) communication systems using compact MIMO antenna array configurations in conjunction with HAP diversity techniques. In addition, we evaluate the system performance for different separation angles between HAPs. Simulation results show that the HAP diversity system provides superior performance compared to the single HAP case.

  • 5400. Hult, Tommy
    et al.
    Mohammed, Abbas
    COMBINED POLARIZATION AND SATELLITE DIVERSITY FOR HIGH DATA RATE COMMUNICATIONS2006Conference paper (Refereed)
    Abstract [en]

    This paper addresses the potential gain of using multiple-input multiple-output (MIMO) principle in order to increase the bandwidth efficiency in satellite communication systems. In particular, we consider the increase in channel capacity that is possible by exploiting satellite and polarization diversity. In addition, we investigate the effect of using different compact MIMO polarization antenna configurations and power control on the information theoretic capacity of the total transmission channel of the satellite system.

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