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  • 101. Gustafsson, Harald
    Human Voice Communications2001Report (Other academic)
    Abstract [en]

    Humans communicate by many means. The two senses most used for communication are the visual and auditory senses. These can be stimulated by other humans by using for example hand gestures, face expressions, speech and song. This report will give a short introduction to the auditory sense and to speech generation. The text is mainly an abridgement of the books "Hearing" edited by B. C. J. Moore, and "Acoustic Phonetics" by K. N. Stevens.

  • 102. Gustafsson, Harald
    et al.
    Claesson, Ingvar
    Nordholm, Sven
    Lindgren, Ulf
    Dual-Microphone Spectral Subtraction2000Report (Other academic)
    Abstract [en]

    Mobile phones are constantly decreasing in size, thereby complicating the acoustical functionality. Signal processing methods can be used to partially mitigate this problem. In this paper we suggest a method which uses multiple spectral subtraction functions and two microphones, introducing only a short signal delay. The idea is to use spectral subtraction methods to extract the noise as well as the speech during a single time-frame. The environment background noise may not be stationary, thereby limiting the method to only employ short estimates of the background noise signal. Results are presented for experiments in various environments, showing a reduced noise level in the processed signal compared with the un-processed signal, and with preserved speech quality.

  • 103. Gustafsson, Harald
    et al.
    Nordholm, Sven
    Claesson, Ingvar
    Spectral subtraction using correct convolution and a spectrum dependent exponential averaging method.1998Report (Other academic)
    Abstract [en]

    In handsfree speech communication the signal to noise ratio is poor which makes it difficult for the listener to have a relaxed conversation. By using speech enhancement processing, the quality of conversation will be enhanced. This paper describes a speech enhancement algorithm based on spectral subtraction. The method employs a noise and speech dependent gain function which is used to design a filter. The proper measures have been taken to obtain a causal filter and also to ensure that the circular convolution yields a linear filtering. A novel method that uses spectrum-dependent exponential averaging to decrease the variance of the gain function is also presented. The result obtained is a 13 to 18 dB noise reduction, with minor speech distortion and moderate residual noise distortion.

  • 104. Gustafsson, Ronnie
    et al.
    Mohammed, Abbas
    Simulation of Wireless Fading Channels2003Report (Refereed)
    Abstract [en]

    Future services in wireless communications will increase the need for high bit rates in the system because of the use of ``wideband'' contents such as streaming video and audio. For example, there might be services where the users can download movies to the car theatre system, or where a user can react to the doorbell ringing even though he or she is miles away from home. It will be possible to run business software remotely using mobile devices, removing the need for ``dumb down'' software in the terminal devices. Also, users might want to be able to seamlessly roam between different air interfaces or standards using the same device. Some basic services are already implemented in the existing 2G systems such as GSM or IS-136, more services are planned for the new 3G systems and other advanced features have to wait until 2011 when 4G is scheduled for release. The demands for higher bit rates combined with the ever-increasing number of users, however, introduces the need for clever and efficient usage of the limited resource of the wireless channel. Two major impediments to high-performance wireless communication systems are intersymbol interference (ISI) and cochannel interference (CCI). ISI is caused by the frequency selectivity (time dispersion) of the channel due to multipath propagation and CCI is due to cellular frequency reuse. Equalizers can be used to compensate for ISI and CCI can be reduced by the use of adaptive antenna arrays (also known as "smart antennas"). The smart antenna utilizes an array of antenna elements that provide directional (spatial) information about the received signals. Since the desired signal and unwanted cochannel interferers generally arrive from different directions, an adaptive beamforming algorithm can adjust the spatial gain to enhance the desired signal and mitigate the cochannel interferers. In this Report we discuss the basic propagation mechanisms affecting the performance of wireless communication systems. We also present the implementation of a simulator which takes these mechanisms into account and verifies its performance for different channels. We also introduce basic equalization and beamforming concepts. Finally, we evaluate the recursive least squares (RLS) equalizer and receiver structures and assess their performance in combating the destructive effects of the channel.

  • 105. Gustavsson, Rune
    Agent Oriented Software Engineering. A Motivation for and an Introduction to a Novel Approach to Modeling and Development of Open Distributed Systems1994Report (Other academic)
    Abstract [en]

    The purpose of this paper is to give a short motivation for and an introduction to a novel approach of how to view and develop flexible open distributed systems of the future. We propose that the emerging style of Agent Oriented Sofnyare Engineering (AOSE) has high potentials as a candidate for future models of system development. We indicate in this paper some recent and upcoming applications of AO-SE. Furthermore, we round off the paper by giving an overview of an ongoing project within an AOSE frame work, Societies of Computation (SoC) at the University of Karlskrona/Ronneby. We also give an overview of an experimental SoC-platform, developed together with Sydkraft AB, for applications in Intelligent Distribution Automation

  • 106. Gustavsson, Rune
    et al.
    Akkermans, Hans
    Hägg, Staffan
    Ygge, Fredrik
    Kozbe, Barcin
    Lundberg, Christer
    Carlsson, Bengt
    Societies of Computation (SoC). A Framework for Open Distributed systems-phase II:1995-981995Report (Other academic)
    Abstract [en]

    The research program Societies of Computation (SoC) at the IDE department of HK/R has been in operation since more than one year [ 11, [2]. The SoC framework takes a Multi Agent System (MAS) approach when addressing issues in open distributed computing. The results so far are very promising and will shortly be outlined below. Assessment of those results combined by results and ideas from the international research society as well as needs from enterprises are background material for our next phase. The goals and expected results from this phase is briefly discussed in following sections. The research group, performing activities in the SoC framework, has been formed during the first phase of the project, and has at present the following active members: Rune Gustavsson, professor and principal investigator, Hans Akkermans, professor at Twente University and guest researcher, Eric Astor, Ph.D., University of Lund, Olle Lindeberg, Ph.L., HK/R, Staffan Hagg, Ph.L., HK/R, Fredrik Ygge, MSc., HK/R and Sydkraft, Barcin Kozbe, M.Sc., Ericsson Infocom Christer Lundberg, M.Sc, University College of Kalmar, Bengt Carlsson, M.Sc., University of Lund Occasionally also other researchers at IDE are involved in shorter R&D activities conducted under the SoC umbrella. Applications developed in SoC have also been sources for several projects performed by undergra-duate students, during the fiscal year of 1994-95 about 12 person years, from several undergraduate programs. Those activities of the SoC program have mainly been performed within the center SIKT. SIKT, Society Information and Knowledge Technologies, is a recently formed center at HK/R. The key industrial partner up to this point has been Sydkraft AB. The project Intelligent Distribution Automation (IDA) at Sydkraft has been a valuable partner for developing applications and assessing results. Ronneby Energi AB (REAB) and Affarsverken i Karlskrona AB are also actively supporting our R&D. The project Communication and Distributed Computing for Efficient Management of Energy Systems, supported by governmental agencies, has been instrumental for introducing and assessing MAS technologies in the Swedish research society as well as to Swedish industry.

  • 107. Gustavsson, Rune
    et al.
    Hägg, Staffan
    Societies of Computation. A Framework for Computing & Communication1994Report (Other academic)
    Abstract [en]

    Societies of Computation (SoC) is proposed as a frame work for design of real world complex systems involving computing and communication. The computational paradigm behind SoC is communities of rational agents. The framework has three components; Foundational research, Generic technologies and Applications.

  • 108.
    Ha, Simon
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Construction industry market segmentation: Foresight of needs and priorities of the urban mining segment2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context: Current unsustainable practices have resulted in the depletion of natural resources and a prevailing material scarcity. Urban Mining has emerged in this context and suggests the “mining” of cities or other sources in urban areas to retrieve valuable resources. It raises the topic of how urban mining as a market segment of the construction industry is like today and in the future. 

    Objective: The thesis sets out to study what firms in the urban mining market segment desires in terms of needs and priorities. Furthermore, what could be prioritized in the future (2030), what future scenarios could be expected and what implications these can have on organizations within the segment and on the construction industry. 

    Method: A foresight methodology was applied as a framework for the research design. Interview with representatives from 10 firms, including observations of their operations, resulted in a number of mutual needs shared across the urban mining segment. These were prioritized in relative importance based on a questionnaire of 67 respondents representing 44 different firms in Sweden. A combination of these studies and a review of technology trends further enabled the extrapolation of future scenarios. 

    Results: The findings shows that firms within the urban mining market segment prioritizes and emphasizes needs related concerns in optimization, cost control, safety, environmental and social care today. Needs related to safety, environmental and social care are indicated to remain top prioritized as a result of the future market circumstances. A holistic and lifecycle approach in urban mining practices was deemed of low priority today but was indicated to grow significantly in relative importance in the future. 

    Conclusion: Technology, urbanization and globalization indicates stricter and more competitive market circumstances in the future. Especially related to safety, lifecycle consideration, environmental, and social care. The research suggests that firms concerned and those operating within the urban mining segment may need to undergo transformational changes in their organization to meet what the market segment expects in the future. Moreover, the findings opens up the possibility for actors and stakeholders concerned with the construction industry to proactively go into a desired future by knowing how the future market could unfold.

  • 109. Haan, Jan Mark de
    Convergence and Complexity Analysis of Delayless Subband Adaptive Filters2004Report (Other academic)
    Abstract [en]

    Subband adaptive filters have been proposed to circumvent the drawbacks of slow convergence and high computational complexity associated with time domain adaptive filters. Subband processing introduces transmission delays and signal degradations due to aliasing effects. In order to overcome the transmission delays, delayless adaptive filtering has been introduced where the coefficient adaptation is performed in the subband domain while signal filtering is performed in fullband. In this paper convergence behavior and computational complexity of two different types of delayless adaptive filters are considered. Both open loop and closed loop configurations are studied. The theoretical results are compared with simulations of algorithms in a system identification scenario.

  • 110. Haan, Jan Mark de
    et al.
    Grbic, Nedelko
    Claesson, Ingvar
    Filter Bank Design for Subband Adaptive Filtering Applications2001Report (Other academic)
    Abstract [en]

    Subband adaptive filtering has been proposed to improve the convergence rate while reducing the computational complexity associated with time domain adaptive filters. Subband processing introduces transmission delays caused by the filters in the filter bank and signal degradations due to aliasing effects. One way to reduce the aliasing effects is to impose oversampling in subbands rather than critical sampling and thus reduce signal degradation. By doing so, additional degrees of freedom are introduced for the design of filter banks which may be optimally exploited. In this report, a design method for modulated uniform filter banks with any oversampling is suggested, where the analysis filter bank delay and the total filter bank delay may be specified, and where the aliasing and magnitude/phase distortions are minimized.

  • 111. Haan, Jan Mark de
    et al.
    Nordholm, Sven
    Claesson, Ingvar
    Design of Nonuniform Filter Banks with Frequency Domain Criteria2004Report (Other academic)
    Abstract [en]

    This paper presents methods for the design of nonuniform filter banks. The filter bank structure is obtained from an uniformly modulated filter bank by using an allpass transform which has a lossless frequency function and a nonlinear phase function. The proposed design methods include linear and quadratic frequency domain criteria and linear constraints. Considered applications are subband adaptive filtering and subband coding. Analysis filter banks and synthesis filter banks are designed in two subsequent stages, and design objectives include minimization of subband aliasing as well as reconstruction output residual aliasing components on an individual basis. This way to formulate design objectives is appropriate for filter banks used in subband adaptive filtering. Other design objectives are to optimize the overall filter bank response for low amplitude and phase distortion. Designs with phase compensation for linear phase overall response are included. Examples are included of filter banks with increasing bandwidth.

  • 112. Hansson, Karin
    Entering Heart of Darkness from a Postcolonial perspective. Teaching Notes1998Report (Other academic)
    Abstract [en]

    The aim of this paper is twofold. First it contains a description how Heart of Darkness can be used in the definition and discussion of the terms imperialism and civilization. Second it describes a pattern of analysis based on the novella that is particularly relevant for postcolonial studies. Thus the novella, together with a selection of source material, serves both to give the historical and factual background necessary for the study of New Literatures in English and to provide the students with an analytical model that may be applied to other books in their reading list.

  • 113. Hansson, Karin
    Gerald Murnane's Changing Geographies2000Report (Other academic)
    Abstract [en]

    Lecturing on his novel The Plains at La Trobe University Gerald Murnane argued that the book “was the story of a man who tried to see properly.” In the introductory paragraph we are told that the first-person narrator is looking for “anything in the landscape that seemed to hint at some elaborate meaning behind appearance.” This search for “the furthest of all landscapes” is a recurrent theme in Murnane’s writing. My paper will discuss the characteristics and the function of his idiosyncratic geographies in such contexts. As he writes in Velvet Waters his mysterious hidden vistas of loneliness and otherworldliness belong to a world in which “there will never be any such thing as time. There is only place.” These two novels like Inland and Landscape With Landscape take us on cerebral journeys across maps and strange territories of continually changing perspectives. It will be argued that the settings referred to as Paraguay, Hungary, America or Australia, ‘the plains’ or ‘the inland’ are to be understood as mental precincts, as states of mind.

  • 116. Hansson, Karin
    The Departure of the Author: A Post-Structuralist Reading of Gerald Murnane's Landscape with Landscape1999Report (Other academic)
    Abstract [en]

    Gerald Murnane’s Landscape With Landscape is an intriguing book, full of contradictions and inconsistencies, teasing in the way it seems to be deliberately constructed to escape interpretation. Its anonymous, subversive and conceited first-person narrator cum protagonist, recognizable from other books by Murnane, is also the alleged writer of the six stories in the volume. In this capacity he gradually distances himself from his readers and finally, as will be further discussed, divests himself of all credibility. Thematically, truth and reality are key concepts but the narrative slides precariously between events that are ‘really’ taking place and a set of events that exist only in the deceptive narrator’s imagination. All the stories start with a definition of place, a vantage point or a scene of departure. Significantly, as the title indicates, place and spatial perspectives are far more important than time. Seemingly matter-of-fact introductory descriptions like “I am in the backyard of my three-bedroom house in the City of Heidelberg…” or “I stood on a hill northeast of Melbourne and looked across the folds of suburbs…” turn out to be just as unreliable as the person who defines them. What the narrator claims to be a Paraguayan setting turns out to be decidedly Australian, for example. Beneath and beyond what is usually defined as reality, depths and vistas of unreality are exposed. This indeterminacy related to landscapes and perspectives affects the reading experience making the interpretation of the text fraught with intriguing uncertainty.

  • 117. Hansson, Thomas
    Digital kompetens i yrkeslärarutbildningen. Projektet Ung kommunikation2010Report (Other academic)
    Abstract [en]

    Livslångt lärande och informationssamhällets framväxt fordrar några nödvändiga kompetenser. En sådan av EU-kommissionen angiven nyckelkompetens är den digitala. Oavsett om vi använder benämningen IKT-kompetens, IKT-verktyg, technology literacy eller digital didaktik (Hansson 2010a) avser vi med uttrycken en kombination mellan HCI (Human Computer Interaction) och en interaktiv syn på människa, maskin och budskap.

  • 118.
    Hansson, Thomas
    Blekinge Institute of Technology, School of Management.
    FOU vid MAM (2) Pedagogisk praktik, teoribildning och forskning2012Report (Other academic)
    Abstract [en]

    Texter som visar det moderna pedagogikämnets bredd. Variationen sträcker sig från en text om hur man skriver en forskningsansökan till en experimentell text där författaren kombinerar skönlitterära exempel med ett verksamhetsteoretiskt perspektiv.

  • 119. Hansson, Thomas
    Samgående av sektioner i Kommunal Blekinge: En processutvärdering2010Report (Other academic)
    Abstract [en]

    Collective care, awareness of value issues, verbal competency, clear objectives and generosity towards each other characterize acts, actions and activities among the studied trade union representatives. The mentioned personal and institutional qualities make up a foundation for developmental leadership, division of labor and effective mnanagement of information.

  • 120.
    Hardin, Anna
    et al.
    Blekinge Institute of Technology, Faculty of Health Sciences, Department of Health.
    Sandahl, Rebecca
    Blekinge Institute of Technology, Faculty of Health Sciences, Department of Health.
    Kvinnors upplevelser efter genomgången cytostatikabehandling vid bröstcancer – en litteraturstudie2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: Enligt WHO är bröstcancer den vanligaste cancerformen bland kvinnor världen över. Bröstcancer är den största orsaken till dödsfall i både utvecklade och mindre utvecklade länder. Den vanligaste behandlingsformen av bröstcancer är cytostatika vilket har olika påverkan på både kropp och psyke. Därför skiljer sig kvinnors upplevelser åt efter genomgången cytostatikabehandling.

    Syfte: Syftet med studien var att belysa kvinnors upplevelser efter genomgången cytostatikabehandling vid bröstcancer.

    Metod: En litteraturstudie baserat på sju vetenskapliga artiklar med kvalitativ design. Artiklarnas resultatdelar har analyserats med hjälp av Graneheim och Lundmans beskrivning av innehållsanalys.

    Resultat: Analysen resulterade i fyra kategorier samt fyra underkategorier som utgör resultatet: ”Kognitiva förändringar”, där det uppkom två underkategorier: Försämrad koncentrationsförmåga och Oförmåga att minnas där kvinnorna upplevde olika minnesproblem som påverkade vardagen; ”Inte känna igen sig själv” där det uppkom två underkategorier: Emotionella förändringar och Kroppsliga förändringar där kvinnorna upplevde olika känslor samt symtom av klimakteriebesvär och viktökning; ”Att inte bli sedd och hörd”, där kvinnorna upplevde att läkarna inte tog deras bekymmer på allvar; ”Förändrad syn på livet”, där kvinnorna upplevde ett mer positivt synsätt efter cytostatikabehandling och uppgav att meningen med livet hade blivit en central del i deras liv.

    Slutsats: Kvinnor kan ha olika upplevelser efter genomgången cytostatikabehandling beroende på sin tidigare livserfarenhet och den livsvärld kvinnan levde i. Utifrån studiens resultat kan sjuksköterskan få en ökad förståelse om hur livet efter genomgången cytostatikabehandling kan upplevas och därmed kunna ge bättre information och vård. Som andra studier påpekar behövs det mer forskning kring just frågan om upplevelserna efter genomgången cytostatikabehandling. Därför var det av vikt att studera upplevelserna hos dessa kvinnor då allt fler diagnostiseras varje år med bröstcancer.

  • 121.
    Hederstierna, Anders
    Blekinge Institute of Technology, School of Management.
    Förstudie Priselasticitet2004Report (Refereed)
    Abstract [en]

    Rapporten visar att det finns två faktorer som begränsar konkurrensen för den operation som krävs för att ta betalt för mobila tjänster. Den ena faktorn är att betaloperationen kräver information om vem som ska betala och hur mycket. Rådata till denna information kommer från mobiloperatörens nät och är alltså en unik och samtidigt nödvändig resurs för att hantera betalningen, med undantag för de fall när betalningen görs i förväg. Den andra faktorn är att den som först lyckas uppnå stordriftsfördelar i betaloperationen kan ef-fektivt hindra andra aktörer från att träda in på marknaden. Stordriftsförde-larna är extra viktiga när de mobila tjänsterna är så enkla och köps så sällan att priserna bir låga och betalningarna extremt små, s.k. mikrobetalningar. Det är möjligt att morgondagens mobila tjänster inte kommer att kräva mik-robetalningar och då minskar effekten av den faktor som har att göra med stordriftsfördelar. Samtidigt visar mobiloperatörer och banker ett stort intres-se av att skaffa sig ännu större konkurrensfördelar på marknaden för mikro-betalningar med nya system för att använda mobiltelefonen som betalnings-terminal.

  • 122. Hegg, Helena
    Utvärdering av Ungdomsrådet i Karlskrona kommun2005Report (Other academic)
    Abstract [en]

    Idrotts- och Fritidsförvaltningen vid Karlskrona kommun beslutade våren 2004 att en extern utvärdering av Ungdomsrådet i Karlskrona kommun skulle utföras. Utfallet av utvärderingen ska användas som en utgångspunkt för beslut om Ungdomsrådets framtid. Syftet med utvärderingen är att beskriva Ungdomsrådets verksamhet och att göra en jämförelse mellan målsättningarna som satts för Ungdomsrådet och graden till vilken målsättningarna har uppnåtts. Ungdomsrådets övergripande syfte är att utveckla den ungdomsdemokratiska processen i Karlskrona kommun genom uppfyllandet av följande delsyften: - Fungera som en remissinstans åt kommunens förvaltningar. - Vara ett forum för ungdomars åsikter. - Öka ungdomars inflytande. - Stödja ungdomsprojekt i kommunen genom ekonomiska bidrag.

  • 123. Helgeson, Bo
    et al.
    Hardemo, Isa
    Olofsson, Sarah
    Pettersson, Mårten
    Hederstierna, Anders
    Wrenne, Anders
    Hallqvist, Klas
    Innovation for future mobile services2003Report (Other academic)
    Abstract [en]

    The mobile telecom industry has developed a substantial amount of mobile services that have attracted few end-users. The new mobile telephony systems will offer even more possibilities to develop mobile services, and frequent use of mobile services is necessary to warrant the high investment cost in those systems. But how do we then meet users and their needs with continued development of mobile services and prod-ucts? In this project we have started a work to find new ways to identify and screen new possible mobile services. The approach is based on ethnographic studies and economic modeling of everyday work. The project has resulted in a “prototype” method where Work Practice studies are combined with a fairly simple economical screening model. In a pilot study like this it is not possible to solve the fundamental problems of the mobile industry, but it could be seen as a beginning of a work of reconnaissance. We have identified some exciting possibilities, but also some considerable problems. In or-der to be successful, the innovation process needs to be accompanied by a parallel de-velopment of new business models that supports the development of services that ad-dresses the end-users needs. There is also a need for research to understand how inno-vations from “outside” are received and processed in organizations and together with industry increase the effectiveness of the whole innovation process. This pilot study has produced valuable experiences for a continued work. The pro-ject have also resulted in a long list of suggestions for new or refined mobile services. Most of the suggestions could be seen as derivatives of existing services. In one way you could therefore question the “innovation effectiveness” of the method. But the used methods could be seen as a starting point for further development in order to address the question of how to organize environments and processes for real innovation.

  • 124. Helgeson, Bo
    et al.
    Toft, Torgil
    Teleradiologi. Förutsättningar för forskning och utveckling i Blekinge2010Report (Other academic)
    Abstract [en]

    Denna rapport har genomförts i syfte att utforska möjligheterna att bedriva forskning inom området teleradiologi i Blekinge. Blekinge är ett län som kännetecknas av en dynamisk utveckling inom området telekom, ett sjukhus som på olika sätt arbetar med utveckling inom det telemedicinska området och, slutligen, en teknisk högskola som bedriver forskning och utveckling inom tillämpad IT. I denna miljö har det varit en spännande utmaning att titta närmare på vad som kan göras inom teleradiologin. Vi presenterar här resultatet av vårt arbete. I mycket handlar det om en översiktlig beskrivning av området teleradiologi och några av alla de utvecklingsbehov som finns. Vi pekar också ut områden där vi tror att det särskilt skulle gå att bedriva ett fruktbart utvecklingsarbete i Blekinge, med de speciella förutsättningar som finns här. I fokus står den radiologiska kliniska vardagen och möjligheterna att stödja en fortsatt utveckling inom området.

  • 125. Hilding-Rydevik, Tuija
    et al.
    Emmelin, Lars
    Blekinge Institute of Technology, School of Planning and Media Design.
    Alternativ i miljökonsekvensbedömning och miljöbedömning2013Report (Refereed)
    Abstract [en]

    Enligt miljöbalkens bestämmelser om miljöbedömning och miljökonsekvensbedömning ska man vid planeringen ta fram olika alternativ som är förenliga med syftet med planen, programmet eller projektet. Genom att utarbeta och analysera olika alternativ ska beslutsfattarna kunna finna det alternativ som sammantaget är det bästa ur olika aspekter inklusive miljö. I denna rapport beskrivs resultaten av en pilotstudie om hantering av alternativ i miljöbedömning av planer och program och miljökonsekvensbedömning av projekt. Utgångspunkten är erfarenheter att detta på flera sätt inte tycks fungera så som det är tänkt utifrån EU-direktiv och svensk lagstiftning. Pilotstudien har genomförts i fem olika moment: • Internationell litteraturstudie • Granskning av miljökonsekvensbeskrivningar mot en fast granskningsmall • Intervjuer, utifrån en frågelista för semistrukturerade intervjuer, av svenska utförare som arbetar med MKB och MB • Diskussioner med svenska praktiker och med forskare i andra länder. • En workshop anordnad av Naturvårdsverket i samarbete med projektet. Ansvariga för studien är professor Tuija Hilding-Rydevik, SLU (projektledare) och professor Lars Emmelin, BTH Forskningsprogrammet MiSt Programmet "Miljöstrategiska verktyg", MiSt, är ett tvärvetenskapligt forskningsprogram finansierat av Naturvårdsverket. Programmet leds från Blekinge Tekniska Högskola. I programmet studeras verktyg som kan underlätta miljöbedömning i strategiskt beslutsfattande på olika nivåer, från nationell till lokal. Förståelsen och basen för utveckling av verktyg och rekommendationer om verktyg i olika planerings- och beslutsprocesser baseras på empirisk forskning på fall inom flera sektorer. Målen för MiSt-programmet: • Kritisk undersökning av verktygens funktion • Teoribaserad förståelse av deras verkan • Utveckling av råd om effektiv användning av verktyg och kombinationer av verktyg Programchef: professor Lars Emmelin, Fysisk planering, BTH. Biträdande programchef: professor Tuija Hilding-Rydevik, MKB-Centrum SLU.

  • 126. Hjelm, Olof
    et al.
    Gustafsson, Sara
    Cherp, Aleh
    From Tool Technique to Tool Practice: Experiences from the Project Seamless : Strategic Environmental Assessment and Management in Local Authorities in Sweden2011Report (Other academic)
    Abstract [en]

    This report contains the results from the project SEAMLESS, Strategic Environmental Assessment and Management in Local authoritiES in Sweden. The aim of SEAMLESS was to explore conceptual foundations as well as feasibility of establishing better operational and methodological linkages between tools for strategic environmental planning, assessment and management, especially between SEA (according to the EG directive 2001/42/EC and EMS based on the main principles of ISO 14001/EMAS) in local authorities. The rationale for the study was that local authorities are important actors on the environmental arena, which make and implement a large number of decisions directly and indirectly affecting the environment. A multitude of different systems and tools have been developed to support environmental management at local authorities and an integrated use of different tools can have various benefits. The SEAMLESS project has been realized through five main steps. First, a literature review and a survey of international practice were performed. Second, in parallel to the first step, an initial conceptual framework was constructed. The third step in the research process was to carry out case studies in six selected Swedish local authorities in order get a better understanding of how SEA and EMS are dealt with in practice. In the fourth step, the results from the previous steps in the research process were compiled and analyzed in order to develop and conduct a pilot study. Finally in the fifth step, general recommendations for integrated use of strategic planning, assessment and management tools were formulated. Theoretically, local sustainable development strategies could benefit from having influence from some of the main approaches and principles in SEA and EMS methodologies. Achieving this in practice, however, is a challenge that requires a wide systems perspective and a certain degree of maturity in the organization. At the time of SEAMLESS an integrated approach of SEA and EMS was not possible nor asked for by the studied local authorities. The SEAMLESS project‘s core concepts tool technique and tool practice were used for explaining and analyzing the preconditions, possibilities and difficulties in integrating SEA and EMS. Tool technique addresses the more technical aspects of the tools use and integration, neglecting the context in which it is to be used. Applying a tool technique perspective there are several possible linkages between the studied tools that could enhance each tool, e.g. widening the scope of EMS and facilitating follow up of SEA. It is important to understand the context, since it influences the feasibility of tool integration; therefore a tool practice perspective is needed. Furthermore tool integration is another important concept in the SEAMLESS project, where three different stages of integration were identified: formal integration, learning integration and interactive integration. A too strong focus on formal integration (which is closely connected to tool technique) might lead to that potential linkages are not realized. To make such integration possible the focus should be more on learning integration. Interactive integration is hard to achieve and it can be questioned if it is desired. Too much focus on interactive integration might lead to complex resource demanding tool causing ineffectiveness and tool fatigue. The SEAMLESS project resulted in a set of recommendations based on that integration should not be seen as a goal in itself; that attempts of tool integration should focus on bridging the different professional cultures; and that a wide systems perspective is needed.

  • 127.
    Holmberg, William
    et al.
    Blekinge Institute of Technology.
    Andersson, Carl
    Blekinge Institute of Technology.
    Natur och design: En romantisk estetik2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Abstrakt Syftet med arbetet var att undersöka hur man kan digitalt återskapa design och natur i en romantisk estetik. Det vill säga att undersöka hur man kan använda äldre metoder från konstepoken romantiken inom 3D-modellering. Arbetet var främst ett 3D-modelleringsarbete där vi försökte att plocka tekniker och kunskaper från romantikens tavlor och applicera dem inom 3D-modellering. Dessa modeller togs sedan till en scen i en spelmotor (unreal 4) och ljussätts och fotograferas alternativt filmas beroende på vilken scen som skapas.  Arbetet består av två delar, forskning och experimentering. Den forskande delen där vi tittar närmare på tre olika konstnärer och ett antal vetenskapliga artiklar kring materiallära, hur natur växer, hur människor bygger i jämförelse med natur. Det förklaras kort hur optimering av scenerna skett och vilken forskning som skett där. Den andra delen som är huvuddelen av detta arbete är hur scenerna arbetades steg för steg fram. Modeller tas till olika datorrenderade scener i ett försök att efterlikna en 3D-tavla. Två till tre tekniker har testats i varje scen, vi tar sedan lärdom av dem och går sedan vidare till nästa scen. Dessa metoder och tekniker kommer sedan användas i en slutlig scen där vi ska försöka binda ihop allt. Resultatet kan beskrivas som en förhållningsmall till att arbeta med äldre metoder på nya tekniker, i detta arbete förhållningen mellan natur och design grundat i romantiken.  Nyckelord: Romantiken, Design, Natur, Ljussättning, Scener, Estetik 

  • 128.
    hudji, mahmoud
    Blekinge Institute of Technology.
    Effektivisering av produktflöde vid Dynapac AB2018Independent thesis Basic level (university diploma), 12 credits / 18 HE creditsStudent thesis
  • 129. Hult, Tommy
    et al.
    Mohammed, Abbas
    Novel Applications of MIMO Antenna System for Active Suppression of Electromagnetic Fields2005Report (Other academic)
    Abstract [en]

    Active suppression of noise and vibrations is a well established field of research with many applications in acoustic and mechanical industries. In this report we test some of these active control methods combined with MIMO antenna system in order to assess their validity and performance when applied to electromagnetic fields. The application that we evaluated is a model of a mobile phone equipped with one ordinary transmitting antenna and a number of actuator-antennas which purpose is to cancel out the electromagnetic field at a specific volume in space (e.g. at the human head) while maintaining a predefined level of the overall output power of the system. This power control is achieved through the use of a quadratic constraint on the active control algorithm. In addition, we will also investigate the impact of MIMO antenna parameters and carrier frequency on the performance of the system. Simulation results show the promise of using the adaptive control algorithms and MIMO system to attenuate the electromagnetic field power density.

  • 130.
    Hägg, Staffan
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    A Sentinel Approach to Fault Handling in Multi-Agent Systems1996Report (Refereed)
    Abstract [en]

    Fault handling in Multi-Agent Systems (MAS) is not much addressed in current research. Normally, it is considered difficult to address in detail and often well covered by traditional methods, relying on the underlying communication and operating system. In this paper it is shown that this is not necessarily true, at least not with the assumptions on applications we have made. These assumptions are a massive distribution of computing components, a heterogeneous underlying infrastructure (in terms of hardware, software and communication methods), an emerging configuration, possibly different parties in control of sub-systems, and real-time demands in parts of the system. The key problem is that while a MAS is modular and therefore should be a good platform for building fault tolerant systems, it is also non-deterministic, making it difficult to guarantee a specific behaviour, especially in fault situations. Our proposal is to introduce sentinels to guard certain functionality and to protect from undesired states. The sentinels form a control structure to the MAS, and through the semantic addressing scheme they can monitor communication, build models of other agents, and intervene according to given guidelines. As sentinels are agents themselves, they interact with other agents through agent communication. The sentinel approach allows system developers to first implement the functionality (by programming the agents) and then add on a control system (the sentinels). The control system can be modified on the fly with no or minimal disturbance to the rest of the system. The present work is conducted in cooperation with Sydkraft, a major Swedish power distribution company. Examples are taken from that venture, and it is shown how problems can be solved by programming DA-SoC agents, developed here.

  • 131.
    Hägg, Staffan
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    Adaptation in a Multi-Agent System Through Semantic Addressing1995Report (Refereed)
    Abstract [en]

    In many application domains the design of complex systems must cope with rapid and unforeseeable change, requiring an elaborate integration of execution and communication methods. This is especially the case when real-time constraints are present. In this paper a Multi-Agent Systems approach to distributed computing is presented. It has a programmable model of agent interaction, and the interaction is tightly integrated with the mechanisms that control the individual agent behaviour. We introduce the concepts of tailored interaction and semantic addressing which support abstraction, flexibility and robustness in open and emergent distributed systems. We then show that it enables the system to adapt to a number of frequent types of change in the environment. The automation of power distribution is a domain where new services are introduced and new infrastructures are exploited. DA-SoC is an agent architecture developed for this domain, and it exemplifies the need for adaptability and the use of semantic addressing to accomplish this.

  • 132.
    Hägg, Staffan
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    Agent Technology in Industrial Applications1997Report (Refereed)
    Abstract [en]

    The agent metaphor has become increasingly popular in distributed computing systems. As often with a new paradigm, it is not very clear what the exact meaning is. The meaning and the development of the agent paradigm is therefore discussed in this paper. One motivation for using agents in distributed systems is that, due to the rapid technical development of computing and communication facilities, these systems become larger, more complex, and with more heterogeneous components. The change rate for such systems will also increase. Another, but related, motivation is that, in many cases, the systems are open and emergent in new respects: Different parties will be in control of parts of the total system, and the change of the system may not be altogether predictable. It is simply not possible to describe the total system from any one point of focus or at any one point in time, meaning that traditional methods for describing and implementing the systems are not sufficient. Industrial applications (e.g. manufacturing systems, process control systems, or resource management systems) show many of the characteristics mentioned above. Specifically, there is a demand for integrating quite dispersed applications, for example systems for process control, market analysis, and economic management. There is also a stronger demand for communication and interacting with sub-contractors, partners, and customers. This is emphasized with the development of a common communication medium like the Internet. In the ISES project, the agent paradigm is studied and developed for use in Power Distribution Auto-mation. Examples of this work are given here, and the applicability of agent technology is shown for applications that concern Distribution Automation, Demand Side Management, and Home Automa-tion. It is also argued for the applicability of agent technology in other types of industrial applica-tions, based on similarities between problem domains.

  • 133. Hägg, Staffan
    Commitment in Agent Cooperation, Applied to Agent-Based Simulation1999Report (Other academic)
    Abstract [en]

    We regard simulation as a set of interaction episodes between partaking agents in an agent-based simulation. In order to structure the interaction we use commitments, and the semantics of such commitments is an analogy to a two-phase commit scheme used in distributed databases. A commitment is a contract between the involved agents to reach and preserve a specified goal, during a specified time. Here we define the semantics, describe the messages and outline administrative issues. The full strength of the model is reached when an initiator needs to make commitments with a number of other agents. It then awaits the replies, and then, depending on the replies, it either confirms or rejects proposed commitments. Hereby it accomplishes an analogy to an atomic action when a two-phase commit scheme is used. When the commitment scheme is applied to a simulation, a crucial part of the design is to model the requirements for accepting commitments during simulation. We introduce the concepts of an acceptance function and acceptance domains that are used to express these requirements. An example from battle field simulation is given. With the proposed model simulated objects may quite easily be replaced by real objects. With the right kind of interface, real trucks and other entities may partake in real time operations, while other entities are simulated.

  • 134.
    Hägg, Staffan
    et al.
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    Ygge, Fredrik
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    An Architecture for Agent-Oriented Programming with a Programmable Model of Interaction1994Report (Refereed)
    Abstract [en]

    Distributed computing, where the underlying network is complex, heterogeneous and un-reliable, is hard to realize with traditional approaches. Energy Distribution Automation (DA), where the power line is used for communication, and the processing is highly distributed, is our application domain for assessments of new technologies for this kind of system. In this paper we propose a Multi-Agent approach with a large expected number of heavily distributed, medium grain agents. The concept of Agent-Oriented Programming (AOP) is adopted, and an architecture, the DA-SoC, is developed. The language DAAL is used for pro-gramming the agents, and the most important feature is a novel programmable Model of Inter-action (MoI), which allows the user to tailor agent interaction and the social behaviour of agents in the society. The semantic addressing is a powerful abstraction mechanism, that facilitates run-time network management. The emphasis of the paper is on describing and analysing the architecture, the language and the programmable MoI. An example from the DA application domain illustrates how the DA-SoC can be used. The research reported here is a cooperation between the authors’ affiliations mentioned above, and it is a part of the larger projects, Intelligent Distribution Automation (IDA) at Syd-kraft, Malmoe, Sweden, and Societies of Computation (SoC) at the University of Karlskrona/Ronneby, Sweden.

  • 135.
    Hägg, Staffan
    et al.
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    Ygge, Fredrik
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    Gustavsson, Rune
    Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    Ottosson, Hans
    DA-SoC: A Testbed for Modelling Distribution Automation Applications Using Agent-Oriented Programming1994Report (Refereed)
    Abstract [en]

    As computing systems are being applied to ever more demanding and complex domains, the infeasibility of constructing a single, monolithic problem solver becomes more apparent. Furthermore, important applications such as different types of management control systems for power generation and distribution are inherently distributed. A promising novel research direction to overcome complexity barriers in the design and maintenance of complex distributed applications is based on the view of such systems as societies of cooperating agents. In this paper we describe an agent oriented design for load man-agement in an automated power distribution system and a testbed for implementations of such systems. We also present an agent with some novel and important features. The research reported here is a cooperation between the authors’ affiliations mentioned above, and it is a part of the larger projects, Intelligent Distribution Automation (IDA) at Sydkraft, Sweden, and Societies of Computation (SoC) at the University of Karlskrona/Ronneby, Sweden.

  • 136. Ilie, Dragos
    Optimization Algorithms with Applications to Unicast QoS Routing in Overlay Networks2007Report (Other academic)
    Abstract [en]

    The research report is focused on optimization algorithms with application to quality of service (QoS) routing. A brief theoretical background is provided for mathematical tools in relation to optimization theory. The rest of the report provides a survey of different types of optimization algorithms: several numerical methods, a heuristics and a metaheuristic. In particular, we discuss basic descent methods, gradient-based methods, particle swarm optimization (PSO) and a constrained-path selection algorithm called Self-Adaptive Multiple Constraints Routing Algorithm (SAMCRA).

  • 137. Ilie, Dragos
    et al.
    Erman, David
    Peer-to-peer Traffic Measurements2007Report (Other academic)
    Abstract [en]

    The global Internet has emerged to become an integral part of everyday life. Internet is now as fundamental a part of the infrastructure as is the telephone system or the road network. Peer-to-Peer (P2P) is the logical antithesis of the Client-Server (CS) paradigm that has been the ostensible predominant paradigm for IP-based networks since their inception. Current research indicates that P2P applications are responsible for a substantial part of the Internet traffic. New P2P services are developed and released at a high pace. The number of users embracing new P2P technology is also increasing fast. It is therefore important to understand the impact of the new P2P services on the existing Internet infrastructure and on legacy applications. This report describes a measurement infrastructure geared towards P2P network traffic collection and analysis, and presents measurement results for two P2P applications: Gnutella and BitTorrent.

  • 138. Iqbal, Muhammad Imran
    et al.
    Zepernick, Hans-Jürgen
    Quality Assessment of Error Protection Schemes for Wireless JPEG20002010Report (Other academic)
    Abstract [en]

    Wireless imaging services suffer large impairments due to the hostile nature of the wireless channel. Given the limited and expensive channel bandwidth and the high data demanding nature of these services, it becomes a challenging task to provide high quality of service in such error prone channels. Clearly, suitable error protection is necessary in order to maintain sufficient quality of these services under various channel conditions. In this report, therefore, we have investigated different channel error protection schemes for a wide range of channel conditions and coding rates. Two unequal error protection (UEP) schemes have been examined for JPEG2000 images exploiting useful features of the JPEG2000 codestream and using the error protection tool set provided by wireless JPEG2000 (JPWL). Taking the importance of the initial codestream packets on the reconstruction of the image at the receiver into account, the first scheme uses all the additional bandwidth resources in protecting the initial packets of the codestream. The rest of the packets, which are of relatively low importance, are transmitted without any parity symbols assigned to them. In the second UEP scheme, the initial parts of the codestream are strongly protected by assigning them an increased amount of parity symbols. In addition, the tail packets of the codestream are also protected but using a weaker error control code compared to the initial packets. The performance of the proposed UEP schemes has been investigated in terms of the peak signal-to-noise ratio as a typical fidelity metric and three perceptual quality metrics, namely, the Lp-norm, the structural similarity index, and the visual information fidelity criterion. Numerical results of the proposed UEP schemes have been compared with conventional equal error protection (EEP) over additive white Gaussian noise (AWGN) channel as well as Rayleigh fading channel in the presence of AWGN. The results reveal the superior performance of the suggested UEP schemes compared to EEP over a range of channel signal-to-noise ratios and code rates.

  • 139. Isaksson, Lennart
    et al.
    Johnson, Henric
    Fiedler, Markus
    Toward Seamless Integration of Wireless LAN and Cellular Networks2005Report (Other academic)
    Abstract [en]

    Networked applications, no matter whether connected in a wired or wireless way, rely upon the ability of timely data delivery. The achievable throughput is a quality measure for the very task of a communication system, which is to transport data in time. This is of particular importance for nowadays trendy streaming applications such as digital TV, Internet Protocol (IP)-telephony, and gaming. Especially the higher throughput offered by 3G mobile systems (and beyond) as compared to earlier generations of mobile communications seems to pave the way for streaming applications into mobile environments. In this report a method is described that makes a decision between different communication technologies depending on different criteria and expectations stated by the end-user and perceived within the network itself. The Multi-Criteria Decision Making (MCDM) method together with the Analytic Hierarchy Process (AHP) method is used to achieve the concept of Always Best Connected (ABC). Two different groups of criteria are used: benefits and costs. Within the benefit group three metrics are used: Initial Delay (ID), Link Capacity (LC) and Direction Loss (DL) which are analyzed and used before a decision is made. These three metrics are weighted against each other. Finally a case study is presented, using the AHP together with the weighted metrics.

  • 140. Jena, Ajit K.
    et al.
    Popescu, Adrian
    Nilsson, Arne A.
    Modeling and Evaluation of Internet Applications2002Report (Other academic)
    Abstract [en]

    The paper presents a modeling and evaluation study of the characteristics of several "classical" Internet applications (SMTP, HTTP and FTP) in terms of user behavior, nature of contents transferred and application layer protocol exchanges. Results are reported on measuring, modeling and analysis of application layer traces collected, at both the client and the server end, from different environments such as university networks and commercial Frame Relay networks. The methodologies used for capturing traffic flows as well as for modeling are reported. Statistical models have been developed for diverse parameters of applications (e.g., HTTP document sizes, FTP file sizes, and SMTP message sizes), which can be useful for building synthetic workloads for simulation and benchmarking purposes. All three applications possess a session oriented structure. Within each session, a number of transactions are performed. For the above mentioned applications, the number of transactions that may occur during a session has been also modeled.

  • 141. Jena, Ajit K.
    et al.
    Popescu, Adrian
    Nilsson, Arne A.
    Resource Engineering for Internet Applications2002Report (Other academic)
    Abstract [en]

    The focus of the paper is on resource engineering for supporting Service Level Agreements (SLAs) in IP networks. We review some of the recent developments in Internet service architecture and protocol developments as well as some of the most important challenges still to be considered. An important performance metrics that must be considered in developing the new Internet is regarding the delay and the delay variation/jitter. Connected with this, a case-study is reported on end-to-end delay performance in a best-effort Internet. Performance issues of Short Range Dependence (SRD) and Long Range Dependence (LRD) traffic under different resource control regimes are compared. The results show that a major portion of the end-to-end delay comes from the queueing delay at the WAN ingress point, which is due to the significant bandwidth differences that may exist between LAN and WAN link layers. The results also highlight the role TCP window size and Frame Relay Permanent Virtual Channel (FR PVC) control mechanisms play in the provision of delay performance for Internet services.

  • 142. Johansson, Conny
    et al.
    Ohlsson, Lennart
    A Practice Driven approach to Software Engineering Education.1993Report (Other academic)
    Abstract [en]

    This paper describes a two year undergraduate education program in software engineering. This program is designed around the principle of exploratory learning, whereby the students are trained to build knowledge by themselves and actively search for solutions to the problems they experience. In addition to the essential aspects of software engineering of managing complexity of large, changing systems and the ability to work in teams, this programs also aims at preparing the students for working in a field of rapidly changing conditions and constraints. This paper describes how these high level goals have been implemented in an actual curriculum. At the core of the program is a set of project courses which are conducted as role playing games in order to simulate the conditions in an industrial environment. Students have graduated from the program for two years now, and the paper summarizes the main lessons learned as well as a follow-up survey of experiences from some of the organizations who hired the students.

  • 143. Johansson, Conny
    et al.
    Ohlsson, Lennart
    An Attempt to Teach Professionalism in Engineering Education.1993Report (Other academic)
    Abstract [en]

    This paper describes our experiences from creating a two year software engineering education program at Karlskrona/Ronneby University College where we have included professionalism as a major educational element. As the basis for teaching professionalism we use the concept of commitment culture, a working atmosphere built on voluntarily taking responsibility. A large proportion of the curriculum consists of project courses which are run as role playing games where teachers act as customers and consultants.

  • 144. Johansson, Conny
    et al.
    Ohlsson, Lennart
    Molin, Peter
    Teaching Object-orientation: From Semicolons to Frameworks.1995Report (Other academic)
    Abstract [en]

    Software engineering is often associated with the software technology of yesterday. To manage anything, predictability is a key issue, and it takes some time to gather the necessary experience of a new technology. Object technology has not yet reached this stage of maturity but is rapidly becoming established in industry. This paper describes how the object-oriented paradigm is used throughout an academic software engineering education program. The relative immaturity of existing methods and practices is handled by an experiential learning approach that emphasizes questions rather than answers. The paper discusses various pedagogical aspects as well as some of the practical trade-offs and experiences gained in the implementation of the program.

  • 145. Johansson, Elisabet
    Jobb istället för bidrag: Hundrajobben2000Report (Other academic)
    Abstract [en]

    Syftet med projektet "jobb istället för bidrag" har varit att tillvarata de arbetslösas kunskaper i bostadområdena Råslätt, Öxnehaga, Österängen och Huskvarna Södra, samtliga belägna i Jönköpings kommun. Arbetstagarna har också fått möjlighet att förvärva nya kunskaper för att öka chanserna att finna annat arbete alternativt utbildning efter anställningen. Dessutom har de anställda genom projektet fått möjlighet att ansluta sig till ett fackförbund. Vidare har man strävat efter att ta tillvara nätverken i bostadsområdena för att förbättra dem. "Hundrajobben", som denna rapport behandlar, är en direkt fortsättning av "25-an" som var ett pilotprojekt på Råslätt.

  • 146. Johansson, Stefan J.
    et al.
    Davidsson, Paul
    On the Metaphysics of Agents (extended version)2005Report (Other academic)
    Abstract [en]

    As a follow-up to the heated discussion in the mid 90s on how to define agents, we have done a study of how the concept is actually used today. All full papers published in a recent proceedings of the largest agent conference have been classified according to a number of agent properties. These properties have been derived from agent definitions found in well-known text books and publications. We analyze the lattice of properties with respect to the classification and propose new definitions that better match the actual use.

  • 147. Johansson, Sven
    Active Noise Control in Aircraft: Algorithms and Applications1998Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The thesis consists of five papers which are divided into three main parts. Parts A and B deal with active noise control in a propeller aircraft application, whereas Part C deals with active noise control in a helicopter application. Part A presents a comparison between single- and multiple-reference controllers, while Part B deals with different multiple-reference, multiple-channel algorithms. Finally, Part C presents a hybrid headset. The five papers comprise: Part A1: Comparison between a Single-- versus a Twin--Reference Controller in Narrowband ANC Applications. Part A2: Performance of a Multiple- versus a Single-Reference MIMO ANC Algorithm based on a Dornier 328 Test Data Set. Part B1: A Novel Multiple--Reference, Multiple--Channel, Normalized Filtered--X LMS Algorithm for Active Control of Propeller-Induced Noise in Aircraft Cabins. Part B2: Evaluation of Multiple--Reference Active Noise Control Algorithms on Dornier 328 Aircraft Data. Part C: A New Active Headset for a Helicopter Application. The test data sets used in the computer evaluations are based on real--life data throughout. The data was recorded in a twin-engine propeller aircraft (Dornier 328) and a Super Puma helicopter during flight.

  • 148. Johansson, Sven
    et al.
    Nordebo, Sven
    Sjösten, Per
    Claesson, Ingvar
    A Novel Multiple-Reference Algorithm for Active Control of Propeller-Induced Noise in Aircraft Cabins2000Report (Other academic)
    Abstract [en]

    The cabin noise inside propeller aircraft is essentially dominated by strong tonal components at harmonics of the blade passage frequency of the propellers. In order to achieve an efficient reduction of such a periodic low frequency noise, it is advisable to use an active noise control system based on adaptive narrowband feedforward techniques. The feedforward controller presented in this paper exploits narrowband assumptions by using complex-valued filtering and complex modeling of control paths. This paper introduces a multiple reference controller based on the novel actuator-individual normalized Filtered-X Least-Mean-Squares (FX LMS) algorithm. This algorithm combines low computational complexity with high performance. The algorithm is of the LMS-type. However, owing to the novel normalization of the algorithm it can also be regarded as a Newton-type algorithm. A comparison between the actuator-individual normalized FX LMS algorithm and the ordinary normalized FX LMS algorithm is presented. The results demonstrate better performance in terms of convergence rate and tracking properties when the Newton-like actuator-individual normalized FX LMS algorithm is used as compared with the conventional normalized LMS algorithm. The evaluation was performed using noise signals recorded inside the cabin of a twin engine propeller aircraft during flight. The paper also discusses variants of the actuator-individual normalized FX LMS algorithm.

  • 149. Johansson, Sven
    et al.
    Sjösten, Per
    Persson, Per
    Claesson, Ingvar
    Experimental Performance Evaluation of a Multi-Reference Algorithm for Active Control of Propeller-Induced Cabin Noise2000Report (Other academic)
    Abstract [en]

    A noisy environment dominated by low frequency noise can often be improved through the use of active noise control. This situation arises naturally in propeller aircraft where the propellers induce periodic low frequency noise inside the cabin. The cabin noise is typically rather high, and the passenger flight comfort could be improved considerably if this level were significantly reduced. This paper discusses the operation and robustness of a narrowband feedforward active noise control system in a practical installation. The ANC system used 8 control sources and 11 control microphones, and the control algorithm was the multi-reference actuator-individual normalized filtered-x least mean squares algorithm. The experiment was performed in a full-scale fuselage section of a SAAB 340 aircraft. To produce the propeller noise, loudspeakers mounted in a ring around the fuselage were used. Results are presented from a series of experiments on the active control of propeller-induced cabin noise. Among the ``flight" conditions evaluated were: conditions where the ``propellers" were completely synchronized, and conditions with constant as well as time-varying frequency beat between ``left and right propellers."

  • 150.
    Jyothula, Urmila
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Performance Evaluation of Multicast Behavior in Congested Networks2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Compuverde’s software-defined storage product uses multicast for the communication between servers in a cluster. The product makes use of IP UDP multicast for sending status messages between the servers that forms the storage cluster. The storage clusters capacity and performance scales linear to the number of servers in the cluster. The problem is that the multicast traffic also increases with the number of nodes. All nodes send to all other nodes in the cluster. In this document, we present a proposal on evaluation of IP multicast behavior in a network congested with traffic similar to that produced by Compuverde’s product. IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. In order to provide an efficient, timely, and global many-to-many distribution of data, and as such may become the broadcast medium of choice in the future, IP multicasting is used[1]. The main benefit of IP Multicast is that it reduces the bandwidth consumption when data from a sender must reach multiple receivers. We are interested in studying the effects on the network when we send multicast packets at a rate closed to the operational limit of the switch. To be able to study this behavior at larger scale Compuverde’s will provide a cluster with 48 servers all connected to the same switch. In addition, we will compare the behavior of IPv4 multicast traffic to that of IPv6.

    Aims and Objectives: Our aim of my thesis is mainly to focus on IP multicast and compare the IPv4 multicast performance results to the results from IPv6 multicast. In addition, a C++ tool for generating multicast traffic will be developed on Linux. A detailed study on IP multicast (IPv4, IPv6). Detailed study on the design and efficient implementation of a multicast traffic generating tool. Detailed study on the switch that will be used in the project. Additional switches may be provided by BTH. Detailed study on the pattern of dropped packets when traffic rate approaches operational limit and other related impairments on QoS metrics (e.g., CPU utilization).

    Methods: The method is to develop a tool that will generate multicast load towards servers in a cluster. The data sent as multicast packets shall consist of information that will make it possible to detect packet loss on the receiving servers if the network gets congested. The first version of the tool shall use existing socket classes that are based on the IPv4 protocol and shall be written in C++. The tool shall be able to run in two modes at the same time: client mode and server mode. The server part of the tool shall subscribe to a predefined multicast address and receive incoming multicast packages. The client part of the tool shall send data packages to the same predefined multicast address at a configurable rate that will increase over time. The data in the packet that will be sent shall be constructed in a way that lets the receiver (server) detect if a packet is lost in transmission. The load should start small with a small number of servers in the cluster, and then in steps scale up the number of servers, until a maximum of 48 servers is reached. The rate that the multicast packets is sent should also be increased, until the switch gets overloaded and starts to drop packets. The pattern of how packets are dropped should be observed. For example such as, if it is biggerlarge chunks of packets that get dropped or if it is every second packet that gets dropped. The second version of the tool shall support IPv6 multicast. The second round of tests should be performed in a way that makes them comparable to the results from the IPv4 tests so it is possible to draw conclusions if one protocol performs better or is more reliable.

    Result: The maximum number of IPv4 packets a switch can handle is 140 packets per second. The maximum number of IPv6 packets a switch can handle is 6 packets per second. The CPU utilization is more while multicasting the IPv4 packets than while multicasting IPv6 packets by using switch, 95 Nodes.

    Conclusion: The IPv4 is most efficient protocol than IPv6 protocol while sending the packets at very high data rate. The CPU utilization is more higher for sending with the IPv6 protocol packets than with the IPv4 protocol.

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