Dissertations / Theses on the topic 'Computer software Classification'
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Manley, Gary W. "The classification and evaluation of Computer-Aided Software Engineering tools." Thesis, Monterey, California: Naval Postgraduate School, 1990. http://hdl.handle.net/10945/34910.
Full textThe use of Computer-Aided Software Engineering (CASE) tools has been viewed as a remedy for the software development crisis by achieving improved productivity and system quality via the automation of all or part of the software engineering process. The proliferation and tremendous variety of tools available have stretched the understanding of experienced practitioners and has had a profound impact on the software engineering process itself. To understand what a tool does and compare it to similar tools is a formidable task given the existing diversity of functionality. This thesis investigates what tools are available, proposes a general classification scheme to assist those investigating tools to decide where a tool falls within the software engineering process and identifies a tool's capabilities and limitations. This thesis also provides guidance for the evaluation of a tool and evaluates three commercially available tools.
Williams, Byron Joseph. "A FRAMEWORK FOR ASSESSING THE IMPACT OF SOFTWARE CHANGES TO SOFTWARE ARCHITECTURE USING CHANGE CLASSIFICATION." MSSTATE, 2006. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-150444/.
Full textMahmood, Qazafi. "LC - an effective classification based association rule mining algorithm." Thesis, University of Huddersfield, 2014. http://eprints.hud.ac.uk/id/eprint/24274/.
Full textLee, Kee Khoon. "Interpretable classification model for automotive material fatigue." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/361578/.
Full textNguyen, Victor Allen. "A Simplified Faceted Approach To Information Retrieval for Reusable Software Classification." NSUWorks, 1998. http://nsuworks.nova.edu/gscis_etd/749.
Full textGraham, Martin. "Visualising multiple overlapping classification hierarchies." Thesis, Edinburgh Napier University, 2001. http://researchrepository.napier.ac.uk/Output/2430.
Full textHenningsson, Kennet. "A Fault Classification Approach to Software Process Improvement." Licentiate thesis, Karlskrona : Blekinge Institute of Technology [Blekinge tekniska högskola], 2005. http://www.bth.se/fou/Forskinfo.nsf/allfirst2/2b9d5998e26ed1b2c12571230047386b?OpenDocument.
Full textMasood, Khalid. "Histological image analysis and gland modelling for biopsy classification." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3918/.
Full textWalia, Gursimran Singh. "Empirical Validation of Requirement Error Abstraction and Classification: A Multidisciplinary Approach." MSSTATE, 2006. http://sun.library.msstate.edu/ETD-db/theses/available/etd-05152006-151903/.
Full textAlbarrak, Abdulrahman. "Three-dimensional image classification using hierarchical spatial decomposition : a study using retinal data." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2006419/.
Full textWorthy, Paul James. "Investigation of artificial neural networks for forecasting and classification." Thesis, City University London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264247.
Full textWinter, Mark J. "Knowledge refinement in constraint satisfaction and case classification problems." Thesis, University of Aberdeen, 1999. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU106810.
Full textKaky, Ahmed Jasim Mohammed (Aljaaf). "Intelligent systems approach for classification and management of patients with headache." Thesis, Liverpool John Moores University, 2017. http://researchonline.ljmu.ac.uk/7418/.
Full textAmmari, Faisal Tawfiq. "Securing financial XML transactions using intelligent fuzzy classification techniques." Thesis, University of Huddersfield, 2013. http://eprints.hud.ac.uk/id/eprint/19506/.
Full textKhan, Masood Mehmood. "Cluster-analytic classification of facial expressions using infrared measurements of facial thermal features." Thesis, University of Huddersfield, 2008. http://eprints.hud.ac.uk/id/eprint/732/.
Full textOtero, Fernando E. B. "New ant colony optimisation algorithms for hierarchial classification of protein functions." Thesis, University of Kent, 2010. http://www.cs.kent.ac.uk/pubs/2010/3057.
Full textAllanqawi, Khaled Kh S. Kh. "A framework for the classification and detection of design defects and software quality assurance." Thesis, Kingston University, 2015. http://eprints.kingston.ac.uk/34534/.
Full textAkpinar, Kutalmis. "Human Activity Classification Using Spatio-temporal." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614587/index.pdf.
Full texthowever, the feature relation histogram has the ability to represent the locational information of the features. Our extension defines a new set of relations between the features, which makes the method more effective for action description. Classifications are performed and results are compared using feature histogram, Ryoo&rsquo
s feature relation histogram and our feature relation histogram using the same datasets and the feature type. Our experiments show that feature relation histogram performs slightly better than the feature histogram, our feature relation histogram is even better than both of the two. Although the difference is not clearly observable in the datasets containing periodic actions, a 12% improvement is observed for the non-periodic action datasets. Our work shows that the spatio-temporal relation represented by our new set of relations is a better way to represent the activity for classification.
Zhang, Jing Bai. "Automatic hidden-web database classification." Thesis, University of Macau, 2007. http://umaclib3.umac.mo/record=b1677225.
Full textWang, Yi. "Hierarchhical classification of web pages." Thesis, University of Macau, 2008. http://umaclib3.umac.mo/record=b1943013.
Full textKidwell, Billy R. "MiSFIT: Mining Software Fault Information and Types." UKnowledge, 2015. http://uknowledge.uky.edu/cs_etds/33.
Full textMusa, Mohamed Elhafiz Mustafa. "Towards Finding Optimal Mixture Of Subspaces For Data Classification." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1104512/index.pdf.
Full textThere is no standard method to specify the optimal dimensionality for each subspace. In the current models these two parameters are determined beforehand. In this dissertation we propose and test algorithms that try to find a suboptimal number of principal subspaces and a suboptimal dimensionality for each principal subspaces automatically.
Hsu, Samantha. "CLEAVER: Classification of Everyday Activities Via Ensemble Recognizers." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1960.
Full textAlay, Gokcen. "A Classification System For The Problem Of Protein Subcellular Localization." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608914/index.pdf.
Full textBlack, James Francis Patrick 1959. "Applications of artificial neural networks in epidemiology : prediction and classification." Monash University, Dept. of Epidemiology and Preventive Medicine, 2002. http://arrow.monash.edu.au/hdl/1959.1/8103.
Full textGoeschel, Kathleen. "Feature Set Selection for Improved Classification of Static Analysis Alerts." Diss., NSUWorks, 2019. https://nsuworks.nova.edu/gscis_etd/1091.
Full textTekkaya, Gokhan. "Improving Interactive Classification Of Satellite Image Content." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608326/index.pdf.
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cation is an attractive alternative and complementary for automatic classi&
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cation of satellite image content, since the subject is visual and there are not yet powerful computational features corresponding to the sought visual features. In this study, we improve our previous attempt by building a more stable software system with better capabilities for interactive classi&
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cation of the content of satellite images. The system allows user to indicate a few number of image regions that contain a speci&
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c geographical object, for example, a bridge, and to retrieve similar objects on the same satellite images. Retrieval process is iterative in the sense that user guides the classi&
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cation procedure by interaction and visual observation of the results. The classi&
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cation procedure is based on one-class classi&
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cation.
Stalmans, Etienne Raymond. "DNS traffic based classifiers for the automatic classification of botnet domains." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1007739.
Full textJuziuk, Joanna. "Towards a Classification of Design Patterns for Web Programming." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-12834.
Full textAtas, Musa. "Hyperspectral Imaging And Machine Learning Of Texture Foods For Classification." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613883/index.pdf.
Full textshafiq, Hafiz Adnan, and Zaki Arshad. "Automated Debugging and Bug Fixing Solutions : A Systematic Literature Review and Classification." Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3105.
Full textalla automatiska / halvautomatiska felsökning och felrättning lösningar som är tillgängliga i litteraturen. De styrkor / fördelar och svagheter / begränsningar av dessa lösningar identifieras. Vi erkänner också typ av fel som kan fastställas med hjälp av dessa lösningar. Och de programmeringsspråk där dessa lösningar kan genomföras upptäcks också. Till slut en detalj klassificering utförs
+46 763 23 93 87, +46 70 966 09 51
Chintalapati, Lakshmi Venkata Bharadwaj. "Integration of Mission Control System, On-board Computer Core and spacecraft Simulator for a Satellite Test Bench." Master's thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-212663.
Full textYaprakkaya, Gokhan. "Face Identification, Gender And Age Groups Classifications For Semantic Annotation Of Videos." Thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612848/index.pdf.
Full textFlorean, Alexander, and Laoa Jalal. "Mapping Java Source Code To Architectural Concerns Through Machine Learning." Thesis, Karlstads universitet, Institutionen för matematik och datavetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-84250.
Full textSarac, Omer Sinan. "Subsequence Feature Maps For Protein Function Annotation." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609767/index.pdf.
Full textYOUSSIF, ROSHDY S. "HYBRID INTELLIGENT SYSTEMS FOR PATTERN RECOGNITION AND SIGNAL PROCESSING." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085714219.
Full textJones, Joshua K. "Empirically-based self-diagnosis and repair of domain knowledge." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33931.
Full textHyberg, Martin. "Software Issue Time Estimation With Natural Language Processing and Machine Learning." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295202.
Full textTidsuppskattning för programvaruärenden är en avgörande del för planering av projekt. Utvecklare och experter har i många årtionden försökt uppskatta tiden ett ärende kommer ta så exakt som möjligt. Metoderna som används idag är ofta tidskrävande och komplexa. Denna avhandling undersöker om tidsuppskattningsprocessen kan göras med hjälp av språkteknologi och maskininlärning. De flesta programvaruärenden har en fritextbeskrivning av vad som är fel eller behöver läggas till. Tre olika ordinbäddningar användes för att representera fritextbeskrivningen, bag-of-word med tf-idf-viktning, word2Vec och fastText. De olika ordinbäddningarna matades sedan in i två typer av maskininlärningsmetoder, klassificering och regression. Klassificeringen var binär och frågan kan formuleras som tar ärendet mer än tre timmar?. Målet med regressionsproblemet var att förutsäga ett faktiskt värde för den tid som frågan skulle ta att slutföra. Klassificeringsmodellens prestanda mättes med en F1-poäng och regressionsmodellen mättes med en R2-poäng. Den bästa F1-poängen för klassificering var 0.748 och uppnåddes med en word2Vec-ordinbäddning och en SVM-klassificeringsmodell. Den bästa poängen för regressionsanalysen uppnåddes med en bag-of-words-inbäddning, som uppnådde en R2-poäng på 0.380. Vidare undersökning av resultaten och en jämförelse av faktiskta tidsestimat som gjorts av företaget visar att människor bara är lite bättre än modellerna givet klassificeringsfrågan beskriven ovan. F1-poängen för de anställda var 0.792, bara 0.044 bättre än det bästa F1-poängen för modellerna. Slutsatsen för denna avhandling är att modellerna inte är tillräckligt bra för att användas i en professionell miljö. En F1-poäng på 0.748 kan användas i andra situationer, men klassificeringsfrågan i detta problem är för bred för att användas för ett riktigt projekt. Resultatet för regressionen är också för lågt för att vara till någon värdefull användning.
Vakkalanka, Sairam, and SR Phanindra Kumar Narayanasetty. "Investigating Research on Teaching Modeling in Software Engineering -A Systematic Mapping Study." Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2468.
Full textSammanhang : Modellering är en viktig verksamhet , som används i olika faser av programvaruteknik . Utan modeller och modellering , är det nästan omöjligt att utforma och utveckla mjukvarusystem , vilket kräver behovet av modellering för att undervisas i programvaruteknik . Det finns ett antal rapporterade modeller, metoder , verktyg och språk för att undervisa modellering i programvaruteknik , vilket tyder på att det behövs en klassificering och en överblick över området . Denna forskning undersöker tillståndet av publicerad forskning om undervisning modellering i programvaruteknik för att ge en systematisk överblick och klassificering av dessa olika sätt att undervisa modellering med en insikt om deras betydelse och relevans för detta forskningsområde . Mål : Det övergripande målet med forskningen uppnåddes med att uppfylla följande mål : att förstå hur systematisk kartläggning genomförs , att utveckla en systematisk kartläggning process som riktigt kommer att ge data för att undersöka publicerad forskning , tillämpning av processen , och slutligen reflektera över resultaten av de avbildningar, som analyserar betydelsen och utvärdera relevansen av den publicerade forskningen . Metoder : En systematisk litteraturstudie användes som ett verktyg för att förstå och kontrollera hur systematisk kartläggning genomfördes inom området programvaruteknik . Baserat på resultaten av en systematisk litteraturgenomgång har nya riktlinjer som formulerats för att bedriva systematisk kartläggning . Riktlinjerna användes för att undersöka den publicerade forskning om undervisning modellering i programvaruteknik . De resultat som erhållits genom systematisk kartläggning utvärderades baserat på industriell relevans , Rigor och stämningen räkning för att undersöka deras betydelse och identifiera kunskapsluckor . Resultat: 131 artiklar klassificerades i fem klasser , t.ex. språk , kurs Design , Curriculum design, diagram , andra med hjälp av semi - manuell klassificeringssystem och klassificerings fasetter såsom typ av publiken , typ av bidrag , typ av forskning , typ av publikation , typ av årtal , typ av forskningsmetod och typ av studieinställning. Efter utvärderingen av industriell relevans , noggrannhet och stämningen ranking på de erhållna resultaten av klassificeringen , 8 processer , 4 verktyg , 3 metoder , 2 mät - mått och 1 modell extraherades att lära modellering i programvaruteknik . Även denna klassificering i jämförelse med en befintlig klassificering , som bygger på intervjuer och diskussioner , visade att vår klassificering ger en bredare överblick med en djupare insikt om de olika sätten att lära modellering i programvaruteknik . Slutsatser : Resultaten av denna systematiska kartläggning visar att det finns en ökning av forskningsverksamheten på undervisning modellering i programvaruteknik , med Unified Modeling Language ( UML ) är den brett forskningsområde. Mycket forskning framhävs att lära modellering för studenter från den akademiska världen , som indikerar en lucka forskning för att utveckla metoder, modeller , verktyg och processer för att lära modellering för studenter / utövare från branschen . Dessutom , med tanke på stämningen ranking , industriell relevans och noggrannhet av artiklarna , områden som kursdesign och utveckling av läroplaner är mycket eftersatt , vilket tyder på att det behövs mer forskning fokus.
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Stiff, Adam. "Mitigation of Data Scarcity Issues for Semantic Classification in a Virtual Patient Dialogue Agent." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1591007163243306.
Full textClauß, Matthias, Thomas Müller, Frank Richter, and Wolfgang Riedel. "Mitteilungen des URZ 3/2006." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601739.
Full textFießler, Andreas Christoph Kurt. "Hybrid Hardware/Software Architectures for Network Packet Processing in Security Applications." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20023.
Full textNetwork devices like switches, bridges, routers, and firewalls are subject to a continuous development to keep up with ever-rising requirements. As the overhead of software network processing already became the performance-limiting factor for a variety of applications, also former software functions are shifted towards dedicated network processing hardware. Although such application-specific circuits allow fast, parallel, and low latency processing, they require expensive and time-consuming development with minimal possibilities for adaptions. Security can also be a major concern, as these circuits are virtually a black box for the user. Moreover, the highly parallel processing capabilities of specialized hardware are not necessarily an advantage for all kinds of tasks in network processing, where sometimes a classical CPU is better suited. This work introduces and evaluates concepts for building hybrid hardware-software-systems that exploit the advantages of both hardware and software approaches in order to achieve performant, flexible, and versatile network processing and packet classification systems. The approaches are evaluated on standard software systems, extended by a programmable hardware circuit (FPGA) to provide full control and flexibility. One key achievement of this work is the identification and mitigation of challenges inherent when a hybrid combination of multiple packet classification circuits with different characteristics is used. We introduce approaches to reduce redundant classification effort to a minimum, like re-usage of intermediate classification results and determination of dependencies by header space analysis. In addition, for some further challenges in hardware based packet classification like filtering circuits with dynamic updates and fast hash functions for lookups, we describe feasibility and optimizations. At last, the hybrid approach is evaluated using a standard SDN switch instead of the FPGA accelerator to prove portability.
Turkerud, Stina Ramdahl. "Software safety issues in the maritime industry, and challenges related to human computer interfaces. Theoretical background and results of a survey among equipment suppliers, yards and classification societies in four European countries." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9520.
Full textThis thesis concerns the safety in user interfaces. In particular it concerns the user interfaces in systems in which safety is critical. I have studied such systems in the maritime industry, where we for instance may find them on the bridges of ships. Computer systems get more and more important in the daily routines of humans, and it is important that this does not go unnoticed. Designers of computer systems need to take human factors into consideration when designing their systems. These considerations might be especially important in complex systems, as these are often safety critical. The bridges on ships are likely to include complex systems for the operator to handle, as they often involve multiple screens, or other factors that increase the complexity of a system. Such factors might include being able to pay attention to several incidents at once. When dealing with complex systems, it is important that the operator knows how to handle the system, and also how to react when an incident occurs. These are factors that need to be considered by the designer when making the system and theories on how to do this are described in the thesis. I have also described standards which consider this, like the ISO 11064 standard, or the Atomos regulation and the ISO 17894 which considers this for the maritime industry in particular. Parts of the industry have made an effort to develop tools to be used to improve the safety. I have studied some of these efforts and presented them in the thesis. Furthermore, I have developed a survey to study how the individual members and different parts of the industry feel and behave towards safety. The survey gave an insight into reality of how safety is being handled in the industry as a whole. In particular it pointed to the main problem of the maritime industry, that the industry is very heterogeneous, and also that the different parts of the industry are in competition with each other. Most of the respondents had not heard about the Atomos regulation or the ISO 17894 standards, efforts that could have been used as a tool to improve the level of safety. The questionnaire also showed that while most of the respondents are satisfied with the level of safety in their organization, they are not satisfied with the level of safety in the overall industry. The thesis consists of six parts. Part I deals with the introduction and general theory from research methods and psychology. Part II deals with usability and related standards. These include ISO 11064, theory on usability and a description of an accident due to poorly designed user interface. Part III describes relevant background from the maritime industry, which involves the ISO 17894 standard, the Atomos regulation and e-navigation, an example of a newly made effort. Part IV gives a description of the development of my questionnaire, and also provides the results and conclusions made from them. Part V provides the conclusions and suggestions for future work, while part VI contains appendices.
Rößler, Marko. "Parallel Hardware- and Software Threads in a Dynamically Reconfigurable System on a Programmable Chip." Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-129626.
Full textMichael, Inies Raphael Chemmannoor. "FAULT LINKS: IDENTIFYING MODULE AND FAULT TYPES AND THEIR RELATIONSHIP." Lexington, Ky. : [University of Kentucky Libraries], 2004. http://lib.uky.edu/ETD/ukycosc2004t00211/MasterDegreeThesisReportIniesRCM.pdf.
Full textTitle from document title page (viewed Jan. 7, 2005). Document formatted into pages; contains vii, p. 103 : ill. Includes abstract and vita. Includes bibliographical references (p. 99-101).
Mertayak, Cuneyt. "Toward The Frontiers Of Stacked Generalization Architecture For Learning." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608793/index.pdf.
Full textbias-variance&rdquo
trade-off is a challenging issue that the scientists has been working to get better generalization performances over the last decades. Among many learning methods, two-layered homogeneous stacked generalization has been reported to be successful in the literature, in different problem domains such as object recognition and image annotation. The aim of this work is two-folded. First, the problems of stacked generalization are attacked by a proposed novel architecture. Then, a set of success criteria for stacked generalization is studied. A serious drawback of stacked generalization architecture is the sensitivity to curse of dimensionality problem. In order to solve this problem, a new architecture named &ldquo
unanimous decision&rdquo
is designed. The performance of this architecture is shown to be comparably similar to two layered homogeneous stacked generalization architecture in low number of classes while it performs better than stacked generalization architecture in higher number of classes. Additionally, a new success criterion for two layered homogeneous stacked generalization architecture is proposed based on the individual properties of the used descriptors and it is verified in synthetic datasets.
Boynukalin, Zeynep. "Emotion Analysis Of Turkish Texts By Using Machine Learning Methods." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614521/index.pdf.
Full texts research fields. The aim is to develop a machine that can detect type of user&rsquo
s emotion from his/her text. Emotion classification of English texts is studied by several researchers and promising results are achieved. In this thesis, an emotion classification study on Turkish texts is introduced. To the best of our knowledge, this is the first study on emotion analysis of Turkish texts. In English there exists some well-defined datasets for the purpose of emotion classification, but we could not find datasets in Turkish suitable for this study. Therefore, another important contribution is the generating a new data set in Turkish for emotion analysis. The dataset is generated by combining two types of sources. Several classification algorithms are applied on the dataset and results are compared. Due to the nature of Turkish language, new features are added to the existing methods to improve the success of the proposed method.
Löffler-Wirth, Henry, Edith Willscher, Peter Ahnert, Kerstin Wirkner, Christoph Engel, Markus Löffler, and Hans Binder. "Novel anthropometry based on 3D-bodyscans applied to a large population based cohort." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-207844.
Full textYamamoto, Shuichi, and Naonori Ishii. "A way of computer use in mathematics teaching -The effectiveness that visualization brings-." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-81179.
Full textBezek, Perit. "A Clustering Method For The Problem Of Protein Subcellular Localization." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607981/index.pdf.
Full texts functions. Function of a protein may be estimated from its sequence. Motifs or conserved subsequences are strong indicators of function. In a given sample set of protein sequences known to perform the same function, a certain subsequence or group of subsequences should be common
that is, occurrence (frequency) of common subsequences should be high. Our idea is to find the common subsequences through clustering and use these common groups (implicit motifs) to classify proteins. To calculate the distance between two subsequences, traditional string edit distance is modified so that only replacement is allowed and the cost of replacement is related to an amino acid substitution matrix. Based on the modified string edit distance, spectral clustering embeds the subsequences into some transformed space for which the clustering problem is expected to become easier to solve. For a given protein sequence, distribution of its subsequences over the clusters is the feature vector which is subsequently fed to a classifier. The most important aspect if this approach is the use of spectral clustering based on modified string edit distance.