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  • 10051.
    Zeijlon, Robin
    et al.
    University of Skövde, School of Informatics.
    Waller, Vanja
    University of Skövde, School of Informatics.
    Hur virtuella verklighetsglasögon gör skillnad: En jämförelsestudie av ett multiplayerskräckspel med och utan virtuella verklighetsglasögon2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    I detta arbete undersöks på vilket sätt virtuella verklighetsglasögon förändrar en spelupplevelse. Primärt ligger fokus på vad fysisk immersion och sensorisk feedback kan tillföra till spelupplevelsen. Detta innefattar autenticitet och inlevelse.För att undersöka detta används en utav karaktärerna i multiplayerskräckspelet Strobophagia som är omgjord för att fungera med virtuella verklighetsglasögon. I varje test fick en försöksdeltagare spela den omgjorda karaktären och dess originalversion medan en försöksdeltagare fick agera som motståndare och spela den icke omgjorda karaktären.Resultatet visar tydligt på att versionen i virtuell verklighet föredras av försöksdeltagare då den har ökad immersion och användbarhet. Fortsättningsvis anses den även vara mindre av ett spel och mer som en upplevelse. I framtiden behöver detta testas på fler spel och genrer för att säkerhetsställa att resultatet inte är unikt för Strobophagia.

  • 10052.
    Zelander Bävholm, Charlotta
    University of Skövde, School of Humanities and Informatics.
    Form och Karaktärsdesign: Formens påverkan på hur människor uppfattar datorspelskaraktärer2013Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Denna undersökning syftade till att undersöka om människor uppfattade karaktärers personlighet olika beroende på vilken geometrisk form som vävts in i deras design. För att ge en bakgrund till undersökningen går arbetet igenom tidigare undersökningar gällande geometriska former och känslor, ikonografisk analys av bilder på karaktärer, stereotypiska karaktärer och karaktärsdesign.

    Som material för undersökningen skapades sex stycken konceptbilder på karaktärer, en kvinnlig och en manlig för var av de geometriska former som undersöktes: Cirkel, rektangel och triangel. Undersökningen utfördes med hjälp av en enkät där högstadieelever fick kryssa i de personlighetsdrag de förknippade med de olika karaktärerna, samt motivera sina val.

    Resultatet visade att geometriska former påverkade hur respondenterna uppfattade karaktärernas personlighet, men också att många andra attribut spelade en roll, som till exempel ansiktsdrag, kroppshållning och kläder. Slutsatsen skulle kunna bevisas bättre om fler, liknande arbeten gjordes, som fokuserade på flera åldersgrupper eller ställde fler djupgående frågor.

  • 10053.
    Zetterberg, Stefan
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, School of Technology and Society.
    Into, Camilla
    University of Skövde, School of Technology and Society.
    Transitlager som en strategi i ett globalt distributionssystem2009Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Nuförtiden är det stora flertalet försörjningskedjor internationella till sin karaktär och trenden går alltmer mot fokuserade fabriker. Det innebär att ett fåtal fabriker som var och en fokuserar på ett fåtal produkter tar hand om produktionen för hela världsmarknaden. Då tillverkningen sker på få utvalda platser och marknader världen över ska försörjas ifrån dessa krävs ett globalt distributionssystem som ska klara av att hantera den ökade konkurrensen, kundernas krav på kortare ledtider och den ökade differentieringen av produkter.

    Det finns olika strategier för att hantera ett globalt distributionssystem. Syftet med denna uppsats är att utreda om en transitlagerstrategi kan vara ett konkurrenskraftigt komplement eller alternativ till de mer vanligt förekommande distributionsstrategierna. Studien har gjorts genom att skapa ett teoretiskt ramverk vilket beskriver hur det globala distributionssysteme kan hanteras. Med förutsättningen att företagen idag har ett globalt distributionssystem måste de kunna distribuera sina varor över hela världen och teorin behandlar tre distributionsstrategier för att hantera detta och det är centraliserad distributionsstrategi, decentraliserad distributionsstrategi och transitlagerstrategi. De olika distributionsstrategiernas egenskaper samt för- och nackdelar beskrivs för att avgöra i vilka affärsmiljöer respektive strategi lämpar sig.

    Det teoretiska ramverket behandlar hur företag kan välja mellan och kombinera de olika distributionsstrategierna utifrån deras förutsättningar att produkterna ska nå många marknader från ett fåtal fabriker. För att underlätta valet av distributionsstrategi har en matris konstruerats i ramverket. Matrisen bygger på ett antal utvalda variabler vilka är viktiga att ta hänsyn till. Avslutningsvis när en strategi eller en kombination av strategier är vald ska teorin behandla hur företagen praktiskt kan arbeta med de olika strategierna.

    Empirin kommer att redogöra för två fallstudier där de olika företagen är Etylenaminer och Eka Chemicals. Det kommer att beskrivas hur deras distributionssystem ser ut idag, vilka distributionsstrategier som de använder samt hur de arbetar praktiskt med dem.

    I analysen har det teoretiska ramverket ställts emot den insamlade empirin för att utreda om transitlagerstrategin kan vara ett konkurrenskraftigt komplement till den centrala distributionsstrategin och den decentraliserade distributionsstrategin. Den slutsats som forskningen leder fram till är att det finns mer än ett sätt att strukturera distributionssystemet på och genom det bli framgångsrik på en global marknad. Oavsett vilket distributionssystem ett företag har byggt upp kan transitlagerstrategin utgöra ett bra komplement eller alternativ till den centraliserade distributionsstrategin och den decentraliserade distributionsstrategin för att vinna konkurrensfördelar på marknaderna. Transitlagerstrategin kan bland annat ge upphov till kortare ledtider än vad som kan uppnås med den centraliserade distributionsstrategin och mindre kapitalbindning än vad tillämpningen av den decentraliserade distributionsstrategin ger genom att produkten inte behöver lagras lokalt för att erbjuda kunden korta ledtider. Forskningen visar vidare på att det tar mycket lång tid att utveckla en renodlad transitlagerstrategi men att företagen redan i de tidiga utvecklingsfaserna av strategin kan tillgodogöra sig stora konkurrensfördelar.

  • 10054.
    Zetterlund, Marie
    University of Skövde, Department of Computer Science.
    Infology: a study to identify possible elements of infology in some system development methodologies1999Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The purpose of this work is to identify possible elements of infology in some systems development methodologies. To reach the aim two objectives were identified: to gain an understanding of the concept of infology and secondly to study different kinds of methodologies and analyse them to find out possible elements of infology. In order to reach the aim of this work a literature study was performed. Four methodologies were chosen for the analysis and the selection represented a wide range of different methodologies. They were: Soft Systems Methodology (SSM), Effective Technical and Human Implementation of Computer based Systems (ETHICS), Structured Systems Analysis and Design Method (SSADM) and Yourdon Systems Method (YSM). The infological approach has been characterised and the fundamental characteristic of infology is the distinction between data and information. A consequence from this distinction is that the users of the intended information system should participate in the developing process in order to understand the complex and dynamic relations in an organisation and information system. The results of this work have shown that the soft methodologies (SSM and ETHICS) have a high degree of infology and the more hard methodologies (SSADM and YSM) have a low degree of infology.

  • 10055.
    Zetterlund, Marie
    University of Skövde, Department of Computer Science.
    Intranät: en belysning av eventuella problem och åtgärder1998Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    I detta arbete har jag valt att intervjua representanter från 5 större företag som är ledande inom sitt verksamhetsområde. Syftet med denna rapport är att belysa intranätansvarigas syn på de problem och risker som kan uppkomma med intranät som elektronisk informationsmedium. De risker och problem som jag har tittat på är om det finns en risk för en användare att missa relevant information, få tillgång till för mycket information samt utsättas för för mycket information i ett intranät. Information har samlats in via intervjuer och litteraturstudier.

    Undersökningens slutsatser handlar i stort om de åtgärder som ett företag kan vidta för att förhindra att eventuella risker och problem skall uppkomma. Den viktigaste åtgärden är utbildning av den vanliga användaren. Rapporten avslutas med en diskussion kring ämnet samt några eget komponerade riktlinjer för införande av ett intranät i en verksamhet.

  • 10056.
    Zetterman, Karin
    University of Skövde, Department of Computer Science.
    Användarprofiler: kan de bidra till kvalitet i beslutsfattande?2002Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Antalet intranät växer ständigt, samtidigt som allt fler människor känner att de inte kan ta till sig all den information som de erhåller. Intranäten innehåller en mängd användbar information som alla anställda kan ta del av. För att kunna använda intranätet effektivt krävs det att användarna sorterar bland all den information som finns på intranätet. Med hjälp av användarprofiler kan detta ske på ett enkelt sätt. Syftet med detta arbete var att behandla frågan om användarprofiler kan bidra till att bättre beslut tas genom att information overload reduceras. För att besvara arbetets frågeställning har telefonintervjuer med sju respondenter genomförts. Litteraturen som studerats inom detta arbete visar på att information overload kan leda till en mängd konsekvenser så väl för de anställda som företaget som helhet. Resultatet av telefonintervjuerna visar att användarprofiler används ute på företag samt att flera av respondenterna anser att dessa kan bidra till kvalitet i beslutfattandet genom reducering av information overload.

  • 10057.
    Zetterström, Viktor
    University of Skövde, School of Informatics.
    Väderlek: En studie i hur väder och klimatpåverkan på karaktärer i spel uppfattas av spelare2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Väder och klimat finns alltid i verkliga livet och ofta i spel. Men i spelen är det inte alltid vädret fungerar som det gör i verkligheten. Man kan säga att det finns tre kategorier av väder/klimatpåverkan på karaktärer i spel. En där vädret/klimatet inte påverkar karaktären, en där gameplay påverkas av det och en där karaktären också påverkas. Vilken av dessa nivåer föredrar de som spelar? Genom att skapa tre nästan identiska animationer med karaktären Super Mario, med dessa nivåer som skillnaderna, testas detta i denna studie. Efter att undersökningen var utförd visade det sig att den nivå som flest föredrog var den sista, där karaktären och gameplay påverkades. Det skulle gå att utveckla denna undersökning och användafler spel med olika genrer för att se om uppfattningen om väder/klimatpåverkan skiljer sig beroende på genre. Studiens resultat visar indikationer på detta.

  • 10058.
    Zgog, Zana
    et al.
    University of Skövde, School of Technology and Society.
    Wedberg, Åse
    University of Skövde, School of Technology and Society.
    Från fabriksförsäljning till fenomen?: Konkurrensmedels betydelse för en outlet2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna uppsats handlar om konkurrensmedel och hur en outlet arbetar med dessa för att påverka konsumenter i deras val. Bakgrund till uppsatsen är den starka konkurrensen som idag finns inom kläd- och varumärkesbranschen. I takt med att allt fler butiker öppnar sina dörrar intensifieras kampen om konsumenterna. Därför vill vi studera hur en Factory Outlet, som ofta saknar de fördelar, som till exempel en centralt belägen butik har, får konsumenter att välja just dem. Problemställningen som skall belysas är vilka konkurrensmedel en outlet har att jobba med och vilka de faktiskt använder för att skapa en alldeles unik mix som medför att konsumenterna väljer just dem. Vi har därmed utformat en problemformulering som lyder: Vilket konkurrensmedel är det som främst påverkar konsumenten att åka till en outlet, och hur jobbar och använder en outlet olika konkurrensmedel? Syftet med vår uppsats är att utifrån ett företagsekonomiskt perspektiv beskriva hanteringen av olika konkurrensmedels betydelse för en outlet och dess kunder. Vi kommer att fördjupa oss i undersökningen av vilka konkurrensmedel som används och hur de används, samt varför konsumenterna väljer att besöka en outlet. Vi kommer att använda oss av teorier så som konkurrensmedelsmixen, sexhörningen och konsumenters butiksval. Vår undersökning är uppdelad i två delar och utgår ifrån både en kvalitativ- och kvantitativ ansats. Vi ser en klar fördel att använda sig av båda två, då detta medförde att vi begränsade några utav nackdelarna hos varje metod. Undersökningen genomfördes på en av nordens största outlet för varumärken, vid namn Vingåkers Factory Outlet. Den första delen av undersökningen innefattar en öppen individuell intervju med den valda outletens marknadsansvarig och den andra delen innehåller 60 individuella konsumentintervjuer. De centrala slutsatserna för uppsatsen är att Vingåkers Factory Outlets sortiment och varumärkesutbud är det konkurrensmedel, som har störst påverkan på konsumenternas val att åka till outleten. Det är även detta konkurrensmedel som vi kommit fram till att outleten satsar och arbetar mest med. Därför kan vi även konstatera att Vingåkers Factory Outlet prioriterar helt rätt i sitt arbete med de olika konkurrensmedlen.

  • 10059.
    Zhang, Dan
    et al.
    University of Ontario Institute of Technology.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Gao, Zhen
    University of Ontario Institute of Technology.
    An integrated approach for remote manipulation of a high-performance reconfigurable parallel kinematic machine2010In: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 29, no 4, p. 164-172Article in journal (Refereed)
    Abstract [en]

    Flexible and effective manipulation is important and meaningful for the further development and applications of parallel manipulators in the industrial fields, especially for high performance manufacturing. Web-based manufacturing has emerged as an alternative manufacturing technology in a distributed environment. In this paper, an integrated approach is proposed for remote manipulation of the reconfigurable parallel kinematic machine (RPKM) based on sensor-driven Wise-ShopFloor framework. The concept of Wise-ShopFloor integrates the modules of detailed architecture design, module interactions, sensor data utilization and model predictive control. In order to demonstrate the efficiency of this novel methodology, an example of a five degrees-of-freedom (DOF) RPKM is developed for surface finishing. The reconfigurability, the necessary kinematic analysis, and the performance mapping of the 5-DOF RPKM are conducted so as to implement the proposed approach.

  • 10060.
    Zhang, Dan
    et al.
    School of Mechanical and Power Engineering, Nanjing University of Technology, China / Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Canada.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Gao, Zhen
    Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Canada.
    Su, Xiaoping
    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, China .
    On performance enhancement of parallel kinematic machine2013In: Journal of Intelligent Manufacturing, ISSN 0956-5515, E-ISSN 1572-8145, Vol. 24, no 2, p. 267-276Article in journal (Refereed)
    Abstract [en]

    This paper proposes a spatial three degrees of freedom (DOF) parallel kinematic machine enhanced by a passive leg and a web-based remote control system. First, the geometric model of the parallel kinematic machine is addressed. In the mechanism, a fourth kinematic link-a passive link connecting the base center to the moving platform center-is introduced. Each of the three parallel limbs is actuated by one prismatic joint, respectively. The additional link has three passive DOF, namely two rotations around x and y axes and one translation along z axis. With the existence of this link, the unwanted motion of the tool (located in the moving platform) is constrained. The fourth link also enhances the global stiffness of the structure and distributes the torque from machining. With the kinematic model, a web-based remote control approach is applied. The concept of the web-based remote manipulation approach is introduced and the principles behind the method are explored in detail. Finally, a remote manipulation is demonstrated to the proposed structure using web-based remote control concept.

  • 10061.
    Zhang, Hong
    et al.
    University of Skövde, School of Life Sciences.
    Sun, Xiao-Feng
    Department of Biomedicine and Surgery, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
    Synnerstad, Ingrid
    Division of Dermatology, Department of Clinical and Experimental Medicine, Linköping University, Sweden.
    Rosdahl, Inger
    Division of Dermatology, Department of Clinical and Experimental Medicine, Linköping University, Sweden.
    Importance of FAS-1377, FAS-670 and FASL-844 Polymorphisms in Tumor Onset, Progression and Pigment Phenotypes of Swedish Patients With Melanoma: A Case-Control Analysis2007In: The Cancer Journal, ISSN 1528-9117, E-ISSN 1540-336X, Vol. 13, no 4, p. 233-237Article in journal (Refereed)
    Abstract [en]

    PURPOSE: Human skin melanoma at later stages usually has an extremely poor prognosis. It is of importance to search for biologic markers to identify and monitor individuals at risk for melanoma for early diagnosis and to avoid tumor progression. The FAS gene and its natural ligand (FASL) gene initiate the death signal cascade, playing a central role in the apoptotic signaling pathway and tumor growth and metastasis. PATIENTS AND METHODS: In this study, we analyzed polymorphisms in 229 patients with melanoma and 351 age- and gender-matched tumor-free individuals. Genomic DNAs were isolated from mononuclear cells in peripheral vein blood, and the polymorphisms were examined with polymerase chain reaction-restriction fragment length polymorphism techniques. Frequency in distribution of the polymorphisms was compared between the patients with melanoma and the healthy control subjects, and associations with patients' pigment phenotypes, age at diagnosis, and melanoma characteristics were analyzed. RESULTS AND CONCLUSIONS: The FAS-1377, FAS-670, and FASL-844 polymorphisms were not found to be markers of melanoma risk (P > 0.05). In patients with melanoma, frequencies of the FAS-1377, FAS-670, and FASL-844 polymorphisms were different between the patients aged <50 and > or =50 years (P < or = 0.025, P < or = 0.025, and P < or = 0.01). Moreover, the FAS-670 polymorphism correlated with tumor Breslow thickness (P < or = 0.01) and Clark level (P < or = 0.001) and was associated with tumors developing in sun-exposed locations (P < or = 0.001). FAS and FASL were not markers for melanoma risk but might be important in the development and progression of sun-induced melanoma independently of skin type.

  • 10062.
    Zhang, Hong
    et al.
    University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre.
    Wang, Da-Wei
    University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre. Department of Stomatology, The Third Hospital of Hebei Medical University, Hebei, China.
    Adell, Gunnar
    Department of Oncology, Karolinska University Hospital, Karolinska, Sweden.
    Sun, Xiao-Feng
    Division of Oncology, Department of Clinical and Experimental Medicine, Faculty of Heath Science, Linköping University, Sweden .
    WRAP53 is an independent prognostic factor in rectal cancer- a study of Swedish clinical trial of preoperative radiotherapy in rectal cancer patients2012In: BMC Cancer, ISSN 1471-2407, E-ISSN 1471-2407, Vol. 12, p. 294-Article in journal (Refereed)
    Abstract [en]

    Background: Expression of WRAP53 protein has oncogenic properties and it is up regulated in several types of tumors. Methods: We examined expression of WRAP53 protein in rectal cancers and analyzed its relationship to the response to preoperative radiotherapy and patient survival. The WRAP53 protein was examined by immunohistochemistry in normal mucosa, primary tumors and lymph node metastases from 143 rectal cancer patients participated in a Swedish clinical trial of preoperative radiotherapy. Results: Frequency of WRAP53 protein expression was increased in primary rectal cancer compared to the normal mucosa (p < 0.05). In non-radiotherapy group positive WRAP53 in primary tumors (p = 0.03, RR, 3.73, 95% CI, 1.13-11.89) or metastases (p = 0.01, RR, 4.11, 95% CI, 1.25-13.14), was associated with poor prognosis independently of stages and differentiations. In radiotherapy group, positive WRAP53 in the metastasis correlated with better survival (p = 0.04). An interaction analysis showed that the correlations of WRAP53 with the prognostic significance with and without radiotherapy in the metastasis differed (p = 0.01). In the radiotherapy group, expression of WRAP53 in metastases gave a better outcome (p = 0.02, RR, 0.32, 95% CI, 0.13-0.84), and an interaction analysis showed significance between the two groups (p = 0.01). Conclusion: WRAP53 may be a new biomarker used to predict prognosis and to select suitable patients for preoperative radiotherapy.

  • 10063.
    Zhang, Hong
    et al.
    University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre.
    Widegren, Emma
    Linkoping Univ, Dept Oncol, Inst Clin & Expt Med, Linkoping, Sweden .
    Wang, Da-Wei
    Hebei Med Univ, Hosp 3, Dept Stomatol, Shijiazhuang, Peoples R China.
    Sun, Xiao-Feng
    Linkoping Univ, Dept Oncol, Inst Clin & Expt Med, Linkoping, Sweden .
    SPARCL1: a potential molecule associated with tumor diagnosis, progression and prognosis of colorectal cancer2011In: Tumor Biology, ISSN 1010-4283, E-ISSN 1423-0380, Vol. 32, no 6, p. 1225-1231Article in journal (Refereed)
    Abstract [en]

    We investigated whether SPARCL1 played an essential role in tumor initiation, formation and progression of colorectal carcinomas. In this study, we examined expression of SPARCL1 protein in the normal colorectal mucosa, adjacent normal mucosa and primary and lymph node metastases from colorectal cancer patients. In matched patients, we found that SPARCL1 was negative in the distant normal colorectal mucosa, weakly expressed in the adjacent normal mucosa, strongly expressed in primary colorectal adenocarcinomas and slightly expressed in their lymph node metastases. A similar pattern was observed in the SPARCL1 expression from our series of non-matched colorectal cancer patients. The strongest expression and highest frequency of the SPARCL1 protein were found in the primary cancers. Interestingly, in the primary tumors, the frequency of SPARCL1 expression was significantly increased from the Dukes' A to Dukes' B tumors and then decreased gradually from the Dukes' B to C and D tumors. There was no difference in the intensity of SPARCL1 expression between the central areas and invasion margins of the primary tumors. Moreover, the SPARCL1 protein was more strongly expressed in the highly differentiated tumors than the lower differentiated ones. The patients with positive expression of SPARCL1 in their tumors had worse prognosis than the patients with SPARCL1-negative ones, even after the analyses by Multivariate and Interaction method. Expression of SPARCL1 protein might be a valuable biomarker for early diagnosis in colorectal cancers and further predicting patients' prognosis.

  • 10064.
    Zhang, Qiongyan
    University of Skövde, School of Technology and Society.
    The Consumption Function of Luxury Goods2009Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal of this thesis will be to formulate an economic model that exposes the relationship between consumption of luxury goods and selected factors which includes advertising, disposable income, interest rate, price index and stock premium.

    By building the Multiple Linear Regressions model to formulate the consumption function and using the Ordinary Least Squares (OLS) as the method, it becomes apparent that advertising, disposable income and the previous quarter´s disposable income are the major variables to affect luxury good consumption, of all the factors. Furthermore, the previous quarter´s disposable income has a slightly higher effect than the current one on luxury consumption. Similar studies, which focus on luxury items, have proposed models that test a single or a few variables at a time, and others that concentrate on durable goods have a wide range of variables to examine. I attempt to combine both in my model to test luxury consumption with a wide range of variables.

  • 10065.
    Zhang, Xiaoyang
    et al.
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    Lu, Xin
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    Wang, Sheng
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    Wang, Wei
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Li, Weidong
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    A multi-sensor based online tool condition monitoring system for milling process2018In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 72, p. 1136-1141Article in journal (Refereed)
    Abstract [en]

    Tool condition monitoring has been considered as one of the key enabling technologies for manufacturing optimization. Due to the high cost and limited system openness, the relevant developed systems have not been widely adopted by industries, especially Small and Medium-sized Enterprises. In this research, a cost-effective, wireless communication enabled, multi-sensor based tool condition monitoring system has been developed. Various sensor data, such as vibration, cutting force and power data, as well as actual machining parameters, have been collected to support efficient tool condition monitoring and life estimation. The effectiveness of the developed system has been validated via machining cases. The system can be extended to wide manufacturing applications.

  • 10066.
    Zhang, Zhi-Yong
    et al.
    Linkoping Univ, Inst Clin & Expt Med, Dept Oncol, S-58185 Linkoping, Sweden / Tangshan Gongren Hosp, Dept Pathol, Tangshan, Peoples R China / Hebei Med Univ, Hosp 1, Lab Ctr, Shijiazhuang, Peoples R China.
    Zhang, Hong
    University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre.
    Adell, Gunnar
    Karolinska Univ Hosp, Dept Oncol, Stockholm, Sweden.
    Sun, Xiao-Feng
    Linkoping Univ, Inst Clin & Expt Med, Dept Oncol, S-58185 Linkoping, Sweden.
    Endosialin expression in relation to clinicopathological and biological variables in rectal cancers with a Swedish clinical trial of preoperative radiotherapy2011In: BMC Cancer, ISSN 1471-2407, E-ISSN 1471-2407, Vol. 11, p. Artikelnr 89-Article in journal (Refereed)
    Abstract [en]

    Background: The importance of changes in tumour-associated stroma for tumour initiation and progression has been established. Endosialin is expressed in fibroblasts and pericytes of blood vessels in several types of tumours, and is involved in the progression of colorectal cancer. In order to see whether endosialin was related to radiotherapy (RT) response, and clinicopathological and biological variables, we investigated endosialin expression in rectal cancers from the patients who participated in a Swedish clinical trial of preoperative RT. Methods: Endosialin was immunohistochemically examined in normal mucosa, including distant (n = 72) and adjacent (n = 112) normal mucosa, and primary tumours (n = 135). Seventy-three of 135 patients received surgery alone and 62 received additional preoperative RT. Results: Endosialin expression in the stroma increased from normal mucosa to tumour (p < 0.0001) both in RT and non-RT group. In the RT group, endosialin expression in the stroma was positively associated with expression of cyclooxygenase-2 (Cox-2) (p = 0.03), p73 (p = 0.01) and phosphates of regenerating liver (PRL) (p = 0.002). Endosialin expression in the tumour cells of both in the RT group (p = 0.01) and the non-RT group (p = 0.06) was observed more often in tumours with an infiltrative growth pattern than in tumours with an expansive growth pattern. In the RT group, endosialin expression in tumour cells was positively related to PRL expression (p = 0.02), whereas in the non-RT group, endosialin expression in tumour cells was positively related to p73 expression (p = 0.01). Conclusions: Endosialin expression may be involved in the progression of rectal cancers, and was related to Cox-2, p73 and PRL expression. However, a direct relationship between endosialin expression and RT responses in patients was not found.

  • 10067.
    Zhao, Zeng-Ren
    et al.
    Department of General Surgery, The First Hospital of Hebei Medical University, Shijiazhuang, P.R. China.
    Zhang, Zhi-Yong
    Department of Oncology, Institute of Biomedicine and Surgery, Linköping University, Linköping, Sweden / Department of Pathology, Tangshan Gongren Hospital, Tangshan, P.R. China.
    Zhang, Hong
    Department of Dermatology, Institute of Biomedicine and Surgery, Linköping University, Linköping, Sweden.
    Jiang, Li
    Department of Pathology, Tangshan Gongren Hospital, Tangshan, P.R. China.
    Wang, Ming-Wei
    Laboratory Centre, The First Hospital of Hebei Medical University, Shijiazhuang, P.R. China.
    Sun, Xiao-Feng
    Department of Oncology, Institute of Biomedicine and Surgery, Linköping University, Linköping, Sweden.
    Overexpression of Id-1 protein is a marker in colorectal cancer progression2008In: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 19, no 2, p. 419-424Article in journal (Refereed)
    Abstract [en]

    Abstract: The inhibitor of differentiation/DNA binding 1 (Id-1), a negative regulator of basic helix-loop-helix transcription factors, plays an important role in the regulation of cell proliferation and differentiation. We examined the Id-1 expression by immunohistochemistry in 9 adenomas, 79 primary colorectal adenocarcinomas matched with 40 adjacent normal mucosa specimens and its relationship with clinicopathological factors. The Id-1 expression was increased in the carcinoma compared to the adjacent normal mucosa either in the unmatched and matched samples or to the adenoma. There was no significant difference in the Id-1 expression between normal mucosa and adenoma. The Id-1 expression of carcinoma was increased from Dukes' stages A to B, to C and to D. The cases with lymph node metastasis had a higher rate of a stronger Id-1 expression than those without lymph node metastasis. In conclusion, Id-1 overexpression plays an important role in colorectal cancer progression.

  • 10068.
    Zhen, Rong
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre. Merchant Marine College, Shanghai Maritime University, Shanghai, China.
    Riveiro, Maria
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Jin, Yongxing
    Merchant Marine College, Shanghai Maritime University, Shanghai, China.
    A novel analytic framework of real-time multi-vessel collision risk assessment for maritime traffic surveillance2017In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 145, p. 492-501Article in journal (Refereed)
    Abstract [en]

    Multi-vessel collision risk assessment for maritime traffic surveillance is a key technique to ensure the safety and security of maritime traffic and transportation. This paper proposes a framework of real-time multi-vessel collision assessment that combines a spatial clustering process (DBSCAN) for detecting clusters of encounter vessels and a multi-vessel collision risk index model for encounter vessels within each cluster from the large amounts of monitored vessels in a surveyed sea area. First, the vessels monitored are clustered using DBSCAN to obtain the clusters of encounter vessels, filtering out the relatively safe vessels. Then, the dynamic motion relation between encounter vessels within each cluster is modeled to obtain DCPA and TCPA. The semantic and mathematical relationship of vessel collision risk index for each cluster of encounter vessels with DCPA and TCAP is constructed using a negative exponential function. To illustrate the effectiveness of the framework proposed, an experimental case study has been carried out within the west coastal waters of Sweden. The results show that our framework is effective and efficient at detecting and ranking collision risk indexes between encounter vessels within each duster, which allows an automatic risk prioritization of encounter vessels for further investigation by operators. Hence, this framework can improve the safety and security of vessel traffic transportation and reduce the loss of lives and property.

  • 10069.
    Zhou, Bo
    et al.
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / University of Kaiserslautern, Kaiserslautern, Germany.
    Cruz, Heber Zurian
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / University of Kaiserslautern, Kaiserslautern, Germany.
    Atefi, Seyed Reza
    Swedish School of Textiles, University of Borås, Borås, Sweden.
    Billing, Erik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Seoane, Fernando
    Inst. for Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden / Dept. Biomedical Engineering, Karolinska University Hospital, Stockholm, Sweden / Swedish School of Textiles, University of Borås, Borås, Sweden.
    Lukowicz, Paul
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / University of Kaiserslautern, Kaiserslautern, Germany.
    TouchMe: Full-textile Touch Sensitive Skin for Encouraging Human-Robot Interaction2017Conference paper (Refereed)
  • 10070.
    Zhou, Bo
    et al.
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany.
    Velez Altamirano, Carlos Andres
    Department Computer Science, University of Kaiserslautern, Kaiserslautern, Germany.
    Cruz Zurian, Heber
    Department Computer Science, University of Kaiserslautern, Kaiserslautern, Germany.
    Atefi, Seyed Reza
    Swedish School of Textiles, University of Borås, Borås, Sweden.
    Billing, Erik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Seoane Martinez, Fernando
    Swedish School of Textiles, University of Borås, Borås, Sweden / Institute for Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden / Department Biomedical Engineering, Karolinska University Hospital, Stockholm, Sweden.
    Lukowicz, Paul
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / Department Computer Science, University of Kaiserslautern, Kaiserslautern, Germany.
    Textile Pressure Mapping Sensor for Emotional Touch Detection in Human-Robot Interaction2017In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, no 11, article id 2585Article in journal (Refereed)
    Abstract [en]

    In this paper, we developed a fully textile sensing fabric for tactile touch sensing as the robot skin to detect human-robot interactions. The sensor covers a 20-by-20 cm2 area with 400 sensitive points and samples at 50 Hz per point. We defined seven gestures which are inspired by the social and emotional interactions of typical people to people or pet scenarios. We conducted two groups of mutually blinded experiments, involving 29 participants in total. The data processing algorithm first reduces the spatial complexity to frame descriptors, and temporal features are calculated through basic statistical representations and wavelet analysis. Various classifiers are evaluated and the feature calculation algorithms are analyzed in details to determine each stage and segments’ contribution. The best performing feature-classifier combination can recognize the gestures with a 93.3% accuracy from a known group of participants, and 89.1% from strangers.

  • 10071.
    Zhou, Jiayang
    University of Skövde, School of Informatics.
    Guiding operators' attention with the help of a visual aid system2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the cutting age of industrial 4.0, automation has developed rapidly in all aspects. The emergence of the modern industrial control room has provided a new horizon to the large operation. However, the problem facing the operators is too many screens that they need to monitor at the same time which could result in fatal mistakes such as missing important alerts or failing to act on important information. With that being said, this thesis explores the possibilities of developing a visual aid system to help guide operators’ attention. With the knowledge gained from a literature review and previous efforts from ABB, a visual aid system has been developed with implementations such as unreadable screen and blinking cue guiding the operators’ attention. An experiment to evaluate the solution has also been designed and conducted with 29 participants. Both quantitative data and qualitative data have been collected and analyzed. The results suggest a strong benefit in using such a visual aid to help guide operators’ attention.

  • 10072.
    Zhou, Jiayang
    University of Skövde, School of Informatics.
    The reference functions of digital hospice care apps from a Serious Game theory perspective2018Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The thesis identifies a multiplicity of existing challenges and dilemmas in the hospice care field, such as the increasing demands, limited access, difficulties caused from people with life-limiting conditions living at home and other concerns. The thesis proposes a way of combining the advantages of Serious Games and mobile apps to possibly solve some challenges, namely, a digital app designed for patients from a Serious Game perspective, which could be a complement of current hospice care services and assist in remote hospice care. The analysis of existing resources exposes a lack of hospice care apps containing game elements and designed for patients. The thesis therefore formulates two criteria and conducts a review of apps in health & fitness category in the Swedish App Store. Criterion 1 is for identifying the apps and functions that meet the needs of patients with non-small-cell lung cancer (NSCLC). Criterion 2 is for making sure the functions selected containing game elements. The thesis identifies and lists 85 eligible functions and provides brief summaries and analyses. These outcomes can be considered as Reference functions for improving existing hospice care apps and inspiring future researchers and designers.

  • 10073.
    Zia, Muhammad Irfan
    University of Skövde, School of Technology and Society.
    Production Control MechanismsComparison using Multi-ObjectiveSimulation Optimization2009Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The choice of an efficient and effective production control mechanism (PCM)along with the appropriate buffer allocation pattern is very important for anyproduction engineer/decision maker when designing a production line in order toattain the required system performance. This project work aims to give an insightwith different PCMs, different buffer allocation patterns and arrangement ofworkers of different capability to help the production engineers/decision makersto select the right mechanism and pattern. This study has been performed withmulti-objective simulation optimisation (MOSO) tool. The result from manyexperiments have shown that the ascending buffer allocation pattern stands outas the prominent choice when the goal was to attain maximum throughput (TP)and simultaneously keeping minimum cycle time (CT) and work in process (WIP).The PCMs and workers imbalance patterns performance is different in differentregions of the Pareto-optimal CT-TP data plots obtained from MOSO so theirselection is depending on the interest of the desired level of throughput togetherwith the limit of cycle time.

  • 10074.
    Zia, Muhammad Irfan
    et al.
    University of Skövde, School of Technology and Society.
    Cortés Mora, Felipe
    University of Skövde, School of Technology and Society.
    Automation of packing process2008Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The design work that precedes the automation of a process is not an easy job. Each one of the variables and possible risks involved in process must be carefully considered before implement the final design as well the requirements in performance and cost. However automate a dangerous, inefficient or just uncomfortable task entails many benefits that make up for the long period of design process. A well automated line will benefit the production with quality, productivity and capacity among other profits. In this project the immediate objective is to automate the “SANDFLEX Hacksaw blades” packaging process in the plant that SNAEurope owns in Lidköping. Actually the packing is completely manual. One operator packs the blades into the boxes meanwhile one more operator loads and unloads the packing station with empty and full boxes respectively. The task is both, tiring and uncomfortable for the operators as well inefficient for the company since the production rate is limited.

    Analyzing and observing carefully product and process, different theories and strategies to achieve the goal were developed. Three are the possible solutions to solve the problem, with different levels of automation and technologies. The robotic solution uses an articulated robot to perform all the tasks; the hybrid solution uses pneumatic devices to pack the blades and an articulated robot to support the station loading and unloading the boxes. Finally the pneumatic solution uses only pneumatic devices, which hold, open and close, push box and blades using airpower; a few sensors detect positions and states, since a PLC coordinates and controls all process. By means of discussing these solutions with the company’s engineers and workers, after a deep literature study and two test of performance, was it possible to select the most suitable solution to accomplish the packaging task. The pneumatic solution is cheap and simple, but at the same time robust and reliable. This design performs the packaging task efficiently and fast. And more important, the operator passes from pack manually the blades to monitor the process.

  • 10075.
    Zichner, Thomas
    University of Skövde, School of Humanities and Informatics.
    Building graph models of oncogenesis by using microRNA expression data2008Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
    Abstract [en]

    MicroRNAs (miRNAs) are a class of small non-coding RNAs that control gene expression by targeting mRNAs and triggering either translation repression or RNA degradation. Several groups pointed out that miRNAs play a major role in several diseases, including cancer. This is assumed since the expression level of several miRNAs differs between normal and cancerous cells. Further, it has been shown that miRNAs are involved in cell proliferation and cell death.

    Because of this role it is suspected that miRNAs could serve as biomarkers to improve tumor classification, therapy selection, or prediction of survival. In this context, it is questioned, among other things, whether miRNA deregulations in cancer cells occur according to some pattern or in a rather random order. With this work we contribute to answering this question by adapting two approaches (Beerenwinkel et al. (J Comput Biol, 2005) and Höglund et al. (Gene Chromosome Canc, 2001)), developed to derive graph models of oncogenesis for chromosomal imbalances, to miRNA expression data and applying them to a breast cancer data set. Further, we evaluated the results by comparing them to results derived from randomly altered versions of the used data set.

    We could show that miRNA deregulations most likely follow a rough temporal order, i.e. some deregulations occur early and some occur late in cancer progression. Thus, it seems to be possible that the expression level of some miRNAs can be used as indicator for the stage of a tumor. Further, our results suggest that the over expression of mir-21 as well as mir-102 are initial events in breast cancer oncogenesis.

    Additionally, we identified a set of miRNAs showing a cluster-like behavior, i.e. their deregulations often occur together in a tumor, but other deregulations are less frequently present. These miRNAs are let-7d, mir-10b, mir-125a, mir-125b, mir-145, mir-206, and mir-210.

    Further, we could confirm the strong relationship between the expression of mir-125a and mir-125b.

  • 10076.
    Zichner, Thomas
    et al.
    University of Skövde, The Systems Biology Research Centre. University of Skövde, School of Life Sciences.
    Lubovac, Zelmina
    University of Skövde, The Systems Biology Research Centre. University of Skövde, School of Life Sciences.
    Olsson, Björn
    University of Skövde, The Systems Biology Research Centre. University of Skövde, School of Life Sciences.
    Temporal analysis of oncogenesis using microRNA expression data2008In: Proc. Ger. Conf. Bioinformatics, GCB, Bonn: Gesellschaft für Informatik , 2008, p. 128-137Conference paper (Refereed)
    Abstract [en]

    MicroRNAs (miRNAs) have rapidly become the focus of many cancer research studies. These small non-coding RNAs have been shown to play important roles in the regulation of oncogenes and tumor suppressors. It has also been demonstrated that miRNA expression profiles differ significantly between normal and cancerous cells, which indicates the possibility of using miRNAs as markers for cancer diagnosis and prognosis. However, not much is known about the regulation of miRNA expression. One of the issues worth investigating is whether deregulations of miRNA expression in cancer cells occur according to some pattern or in a random order. We therefore selected two approaches, previously used to derive graph models of oncogenesis using chromosomal imbalance data, and adapted them to miRNA expression data. Applying the adapted algorithms to a breast cancer data set, we obtained results indicating the temporal order of miRNA deregulations during tumor development. When analyzing the specific deregulations appearing at different time points in the derived model, we found that several of the deregulations identified as early events could be supported through literature studies.

  • 10077.
    Zieba, Malgorzata
    et al.
    Gdansk University of Technology, Gdansk, Poland.
    Durst, Susanne
    University of Skövde, Enterprises for the Future. University of Skövde, School of Business.
    Knowledge Risks in the Sharing Economy2018In: Knowledge Management in the Sharing Economy: Cross-Sectoral Insights into the Future of Competitive Advantage / [ed] Elena-Mădălina Vătămănescu & Florina Pînzaru, Springer, 2018, p. 253-270Chapter in book (Refereed)
    Abstract [en]

    The purpose of this chapter is to present and analyze potential risks connected with knowledge that organizations operating in the sharing economy might potentially face. 

  • 10078.
    Ziemke, Tom
    University of Skövde, Department of Computer Science.
    Adaptive Behavior in Autonomous Agents1998Report (Other academic)
    Abstract [en]

    This paper gives an overview of the bottom-up approach to artificial intelligence (AI), commonly referred to as behavior-oriented AI. The behavior-oriented approach, with its focus on the interaction between autonomous agents and their environments, is introduced by contrasting it with the traditional approach of knowledge-based AI. Different notions of autonomy are discussed, and key problems of generating adaptive and complex behavior are identified. A number of techniques for the generation of behavior are introduced and evaluated regarding their potential for realizing different aspects of autonomy as well as adaptivity and complexity of behavior. It is concluded that in order to realize truly autonomous and intelligent agents, the behavior-oriented approach will have to focus even more on life-like qualities in both agents and environments.

  • 10079.
    Ziemke, Tom
    University of Skövde, Department of Computer Science.
    Adaptive behavior in autonomous agents1998In: Presence - Teleoperators and Virtual Environments, ISSN 1054-7460, E-ISSN 1531-3263, Vol. 7, no 6, p. 564-587Article, review/survey (Refereed)
    Abstract [en]

    This paper provides an overview of the bottom-up approach to artificial intelligence (AI), commonly referred to as behavior-oriented AI. The behavior-oriented approach, with its focus on the interaction between autonomous agents and their environments, is introduced by contrasting it with the traditional approach of knowledge-based AI. Different notions of autonomy are discussed, and key problems of generating adaptive and complex behavior are identified. A number of techniques for the generation of behavior are introduced and evaluated regarding their potential for realizing different aspects of autonomy as well as adaptivity and complexity of behavior. It is concluded that, in order to realize truly autonomous and intelligent agents, the behavior-oriented approach will have to focus even more on lifelike qualities in both agents and environments.

  • 10080.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Book Review: “Representation and Behavior”2003In: Connection science, ISSN 1360-0494, Vol. 15, no 4, p. 283-286Article, book review (Other academic)
  • 10081.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Cybernetics and embodied cognition: on the construction of realities in organisms and robots.2005In: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883, Vol. 34, no 1-2, p. 118-128Article in journal (Refereed)
    Abstract [en]

    Abstract: Purpose – To point out the relevance of Heinz von Foerster's work to modern embodied cognitive science and artifical intelligence research.

    Design/methodology/approach – The paper discusses (a) von Foerster's contributions to understanding the limitations of the computer metaphor which has long dominated cognitive science, and (b) his theories concerning how reality is constructed in organizationally closed organisms, and what the underlying neural mechanisms are. The latter is exemplified with a simple neuro-robotic model that illustrates the constructive and anticipatory nature of memory.

    Findings – von Foerster's work on the integration of a radical constructivest philosophy of knowledge construction with models of the underlying neurophysiological and sensorimotor mechanisms is still highly relevant to the understanding of embodied cognition and robotic models thereof.

    Originality/value – This paper identifies conceptual contributions that von Foerster's constructivist cybernetics can make to cognitive science's still limited understanding of the embodiment of cognition and “representation”.

  • 10082.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Embodied AI as Science: Embodied Models of Cognition, or Both?2004In: Embodied Artificial Intelligence: International Seminar, Dagstuhl Castle, Germany, July 7-11, 2003. Revised Papers / [ed] Fumiya Iida, Rolf Pfeifer, Luc Steels, Yasuo Kuniyoshi, Springer Berlin/Heidelberg, 2004, p. 27-36Chapter in book (Other academic)
    Abstract [en]

    This paper discusses the identity of embodied AI, i.e. it asks the question exactly what it is that makes AI research embodied. From an engineering perspective, it is fairly clear that embodied AI is about robotic, i.e. physically embodied systems. From the scientific perspective of AI as building models of natural cognition or intelligence, however, things are less clear. On the one hand embodied AI seems to be about physically embodied, i.e. robotic models of cognition. On the other hand the term lsquoembodiedrsquo seems to signify the type of intelligence modeled and/or the conception of (embodied) cognition that is underlying the modeling. In either case, it appears that embodied AI, as it currently stands, might be too narrowly conceived since each of these perspectives is addressed only partially.

  • 10083.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    From Rats to Cognitive robots: Biological insipiration in cognitive systems research2009In: Public Service Review: European Union, ISSN 1472-3395, no 18, p. 330-331Article in journal (Other (popular science, discussion, etc.))
  • 10084.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    From Rats to Robots2009In: The Parliament Magazine, ISSN 1372-7966, no 292, p. 62-Article in journal (Other (popular science, discussion, etc.))
  • 10085.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    On the role of emotion in biological and robotic autonomy2008In: Biosystems (Amsterdam. Print), ISSN 0303-2647, E-ISSN 1872-8324, Vol. 91, no 2, p. 401-408Article in journal (Refereed)
    Abstract [en]

    This paper reviews some of the differences between notions of biological and robotic autonomy, and how these differences have been reflected in discussions of embodiment, grounding and other concepts in AI and autonomous robotics. Furthermore, the relations between homeostasis, emotion and embodied cognition are discussed as well as recent proposals to model their interplay in robots, which reflects a commitment to a multi-tiered affectively/emotionally embodied view of mind that takes organismic embodiment more serious than usually done in biologically inspired robotics.

  • 10086.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    On the Role of Robot Simulations in Embodied Cognitive Science2003In: AISB Journal, ISSN 1476-3036, Vol. 1, no 4, p. 389-399Article in journal (Refereed)
  • 10087.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Radar Image Segmentation using Recurrent Artificial Neural Networks1996Report (Other academic)
    Abstract [en]

    This paper discusses the application of artificial neural networks to the segmentation of Doppler radar images, in particular the detection of oil spills within sea environments, based on a classification of radar backscatter signals. Best results have been achieved with recurrent backpropagation networks of an architecture similar to that of Elman's Simple Recurrent Network. The recurrent networks are shown to be very robust to variations in both sea state (weather conditions) as well as illumination distance, and their performance is analysed in further detail.

  • 10088.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Radar Image Segmentation using Second-Order Recurrent Networks1996Report (Other academic)
    Abstract [en]

    A second-order recurrent artificial neural network architecture for the segmentation and integration of radar images is introduced in this paper. This architecture consists of two sub-networks: a function network that classifies radar measurements into four different categories of objects in sea environments (water, oil spills, land and boats), and a context network that dynamically computes the function network's input weights. It is shown that this mechanism allows networks to learn to solve the task through a dynamic adaptation of their weighting of different radar measurements.behaviour.

  • 10089.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Radar Image Segmentation using Self-Adapting Recurrent Networks1997Report (Other academic)
    Abstract [en]

    This paper presents a novel approach to the segmentation and integration of (radar) images using a second-order recurrent artificial neural network architecture consisting of two sub- networks: a function network that classifies radar measurements into four different categories of objects in sea environments (water, oil spills, land and boats), and a context network that dynamically computes the function network's input weights. It is shown that in experiments (using simulated radar images) this mechanism outperforms conventional artificial neural networks since it allows the network to learn to solve the task through a dynamic adaptation of its classification function based on its internal state closely reflecting the current context.

  • 10090.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Recurrent Artficial Neural Networks for the Detection of Oil Spills from Doppler Radar Imagery1995Report (Other academic)
    Abstract [en]

    This paper discusses the application of artificial neural networks (ANNs) to the detection of oil spills in sea clutter environments from the classification of radar backscatter signals. A comparison and evaluation of different network architectures regarding reliability of dection and robustness to varying sea states/wind conditions shows that for this problem best results are achieved with a recurrent architecture similar to that of Elman's SRN.

  • 10091.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Remembering how to behave: Recurrent neural networks for adaptive robot behavior.1999Report (Other academic)
    Abstract [en]

    This paper discusses the use of recurrent neural networks for control of and learning in robots and autonomous agents. In particular the use of feedback in both first- and higher-order recurrent network architectures for the realization of adaptive robot behavior is investigated. Two experiments, in which controller network weights are evolved to solve tasks requiring robots to exhibit context- or state-dependent behavior, are used to demonstrate and analyze different recurrent control architectures.

  • 10092.
    Ziemke, Tom
    University of Skövde, Department of Computer Science. Linköping University.
    Rethinking Grounding1999Report (Other academic)
    Abstract [en]

    The grounding problem is, generally speaking, the problem of causally connecting an artificial agent with its environment such that the agent's (internal) mechanisms and behaviour can be intrinsic and meaningful to itself, rather than dependent on an external designer or observer. This paper briefly reviews Searle's and Harnad's analyses of the grounding problem are and evaluates cognitivist and enactivist approaches to solving it. It is argued that, although the two categories of grounding approaches differ in their nature and the problems they have to face, both, so far, fail to provide fully grounded systems. Further it is argued here that the reason the problem is somewhat underestimated lies in the notions of situatedness and embodiment in modern AI, which goes beyond purely computational systems, but fails to acknowledge the historically grounded nature of the relation between living systems and their environments.

  • 10093.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Robosemiotics and embodied enactive cognition2003In: S.E.E.D. Journal: Semiotics, Evolution, Energy, and Development, ISSN 1492-3157, Vol. 3, no 3, p. 112-124Article in journal (Refereed)
    Abstract [en]

    Much research in cognitive science and AI has recently been devoted to the study of adaptive autonomous agents, such as robots and artificial life systems. Such agents are typically said to ‘learn, ‘develop’ and ‘evolve’ in close interaction with their environments. It could be argued that these self-organizing properties solve the problem of representation grounding in AI research, and thus also place such ‘artificial organisms’ in a position of semiotic interest. This paper discusses the use of autonomous agents as models of sign processes and embodied enactive cognition. Furthermore, it addresses the question whether or to what extent such agents are themselves autonomous and capable of semiosis in that sense that living organisms are.

  • 10094.
    Ziemke, Tom
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre. Cognition & Interaction Lab, Human-Centered Systems Division, Department of Computer & Information Science, Linköping University, Linköping, Sweden.
    The body of knowledge: On the role of the living body in grounding embodied cognition2016In: Biosystems (Amsterdam. Print), ISSN 0303-2647, E-ISSN 1872-8324, Vol. 148, p. 4-11Article, review/survey (Refereed)
    Abstract [en]

    Embodied cognition is a hot topic in both cognitive science and Al, despite the fact that there still is relatively little consensus regarding what exactly constitutes 'embodiment'. While most embodied Al and cognitive robotics research views the body as the physical/sensorimotor interface that allows to ground computational cognitive processes in sensorimotor interactions with the environment, more biologically based notions of embodied cognition emphasize the fundamental role that the living body - and more specifically its homeostatic/allostatic self-regulation - plays in grounding both sensorimotor interactions and embodied cognitive processes. Adopting the latter position - a multi-tiered affectively embodied view of cognition in living systems - it is further argued that modeling organisms as layered networks of bodily self-regulation mechanisms can make significant contributions to our scientific understanding of embodied cognition. 

  • 10095.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    The Construction of Embodied Agency: The Other Side of the System-Environment Coin2012In: Constructivist Foundations, ISSN 1782-348X, E-ISSN 1782-348X, Vol. 8, no 1, p. 52-53Article in journal (Other academic)
    Abstract [en]

    > Upshot . Complementary to Alroe and Noe's discussion of constructivist notions of environment, world, etc., this commentary addresses the closely-related notion of agency in constructivist theories - in particular, the question of what would be required for artificial agency - and identifies open questions and fundamental disagreements among constructivist theorists.

  • 10096.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    The Embodied Self: Theories, Hunches and Robot Models2007In: Journal of consciousness studies, ISSN 1355-8250, E-ISSN 2051-2201, Vol. 14, no 7, p. 167-179Article in journal (Refereed)
    Abstract [en]

    Many theories and models of machine consciousness emphasize the role of embodiment. However, there are different interpretations of exactly what kind of embodiment would be required for an artifact to be at least potentially conscious. This paper contrasts the sensorimotor approach, which holds that consciousness emerges from the mastery of sensorimotor knowledge resulting from the interaction between agent and environment, with the view that the living body's homeostatic regulation is crucial to self and consciousness.

  • 10097.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    The `Environmental Puppeteer' Revisited: A Connectionist Perspective on Autonomy´.1997Report (Other academic)
    Abstract [en]

    Today's `autonomous´robots only have very limited autonomy and are in fact very much under the control of the `environmental puppeteer', i.e their behaviour is

    determined, via virtual strings, by environmental conditions. Hence, it has been stated as the goal of modern scientific robotics to "cut the strings and give the robot its autonomy''. Different notions of autonomy in artefacts and living systems are examined in this paper, and different aspects/dimensions of autonomy are identified and illustrated with examples from connectionist robot control. A connectionist architecture is introduced that aims to increase robotic autonomy through integration of connectionist self-organisation/learning with the enactive view of structural coupling between environment and agent. In the resulting robot control architecture it is the environment that is pulling the strings, but the agent that develops them and dynamically decides which of them to use in a particular situation. Hence, the notion of autonomy advocated here is not `independence of environment' (a `freedom' most artefacts have), but rather an agent's capacity to actively embed itself in its environment and flexibly utilize it as a resource.

  • 10098.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Towards Adaptive Behaviour System Integration using Connectionist Infinite State Automata1996Report (Other academic)
    Abstract [en]

    A higher order recurrent connectionist architecture for adaptive control of autonomous robots is introduced in this paper. This architecture, inspired by Pollack's Sequential Cascaded Network, consists of two sub-networks: a function network for the coupling between sensory inputs and motor outputs, and a context network, which dynamically adapts the function network in order to allow a flexible mapping from percepts to actions. The approach taken here is compared to dynamics and algorithmic approach to autonomous robot control, and it is argued that the above architecture allows an integration of (a) the complex structure and control typical for the algorithmic approach, (b) the capacity to utilize systematically continuous state spaces, and (c) the self- organizing learning capacity of connectionist systems with a simple, but powerful mechanism for context-dependent adaptation of behaviour.

  • 10099.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Towards Adaptive Perception in Autonomous Robots using Second-Order Recurrent Networks1996Report (Other academic)
    Abstract [en]

    In this paper a higher-order recurrent connectionist architecture is used for learning adaptive behaviour in an autonomous robot. This architecture consists of two sub-networks in a master-slave relationship: a function network for the coupling between sensory inputs and motor outputs, and a context network, which dynamically adapts the sensory input weights in order to allow a flexible, context-dependent mapping from percepts to actions. The capabilities of this architecture are demonstrated in a number of action selection experiments with a simulated Khepera robot, and it is argued that the general approach of generically dividing the overall control task between sequentially cascaded context and function learning offers a powerful mechanism for autonomous long- and short-term adaptation of behaviour.

  • 10100.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics.
    Towards Autonomous Robot Control via Self-Adapting Recurrent Networks1996Report (Other academic)
    Abstract [en]

    In this paper a higher-order recurrent connectionist architecture is used for learning adaptive behaviour in an autonomous robot. This architecture consists of two sub-networks in a master-slave relationship: a function network for the coupling between sensory inputs and motor outputs, and a context network, which dynamically adapts the sensory input weights in order to allow a flexible, context-dependent mapping from percepts to actions. The capabilities of this architecture are demonstrated in a number of action selection experiments with a simulated Khepera robot, and it is argued that the general approach of generically dividing the overall control task between sequentially cascaded context and function learning offers a powerful mechanism for autonomous long- and short-term adaptation of behaviour

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