Rozprawy doktorskie: „Acquisition of computer software”

1

Kacher, Benjamin Lawrence. "Commercial Computer Software License Rights in Defense Acquisition". Thesis, The George Washington University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1566105.

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The tremendous growth of the commercial software industry in the United States represents an excellent opportunity for the United States Department of Defense ("DoD") to acquire quality software products that will help the DoD achieve its missions. However, the DoD struggles to acquire commercial computer software ("CCS") and commercial computer software documentation ("CCSD") effectively because of the inconsistencies and contradictions found in its rules governing the acquisition of CCS and CCSD.

The DoD's rules governing the acquisition of CCS and CCSD appear simple on the surface and represent an admirable attempt to enable the DoD to more easily acquire CCS and CCSD in the commercial marketplace and to allow commercial vendors to sell their products to the DoD. However, these rules contain many unseen inconsistencies and problems and therefore lead to many areas of confusion and even contradiction.

The primary purpose of this paper is to find ways to help the DoD and CCS vendors work together more effectively, by explaining the DoD's rules governing acquisition of CCS and CCSD, explaining fourteen primary problem areas associated with the acquisition of CCS and CCSD and, finally, by exploring potential solutions to these problems.

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Albu-Rghaif, Ali. "Multi-GNSS signals acquisition techniques for software defined receivers". Thesis, University of Buckingham, 2015. http://bear.buckingham.ac.uk/105/.

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Any commercially viable wireless solution onboard Smartphones should resolve the technical issues as well as preserving the limited resources available such as processing and battery. Therefore, integrating/combining the process of more than one function will free up much needed resources that can be then reused to enhance these functions further. This thesis details my innovative solutions that integrate multi-GNSS signals of specific civilian transmission from GPS, Galileo and GLONASS systems, and process them in a single RF front-end channel (detection and acquisition), ideal for GNSS software receiver onboard Smartphones. During the course of my PhD study, the focus of my work was on improving the reception and processing of localisation techniques based on signals from multi-satellite systems. I have published seven papers on new acquisition solutions for single and multi-GNSS signals based on the bandpass sampling and the compressive sensing techniques. These solutions, when applied onboard Smartphones, shall not only enhance the performance of the GNSS localisation solution but also reduce the implementation complexity (size and processing requirements) and thus save valuable processing time and battery energy. Firstly, my research has exploited the bandpass sampling technique, if being a good candidate for processing multi-signals at the same time. This portion of the work has produced three methods. The first method is designed to detect the GPS, Galileo and GLONASS-CDMA signals’ presence at an early stage before the acquisition process. This is to avoid wasting processing resources that are normally spent on chasing signals not present/non-existent. The second focuses on overcoming the ambiguity when acquiring Galileo-OS signal at a code phase resolution equal to 0.5 Chip or higher and this achieved by multiplying the received signal with the generated sub-carrier frequency. This new conversion saves doing a complete correlation chain processing when compared to conventionally used methods. The third method simplifies the joining implementation of the Galileo-OS data-pilot signal acquisition by constructing an orthogonal signal so as to acquire them in a single correlation chain, yet offering the same performance as using two correlation chains. Secondly, the compressive sensing technique is used to acquire multi-GNSS signals to achieve computation complexity reduction over correlator based methods, like Matched Filter, while still maintaining acquisition integrity. As a result of this research work, four implementation methods were produced to handle single or multi-GNSS signals. The first of these methods is designed to change dynamically the number and the size of the required channels/correlators according to the received GPS signal-power during the acquisition process. This adaptive solution offers better fix capability when the GPS receiver is located in a harsh signal environment, or it will save valuable processing/decoding time when the receiver is outdoors. The second method enhances the sensing process of the compressive sensing framework by using a deterministic orthogonal waveform such as the Hadamard matrix, which enabled us to sample the signal at the information band and reconstruct it without information loss. This experience in compressive sensing led the research to manage more reduction in terms of computational complexity and memory requirements in the third method that decomposes the dictionary matrix (representing a bank of correlators), saving more than 80% in signal acquisition process without loss of the integration between the code and frequency, irrespective of the signal strength. The decomposition is realised by removing the generated Doppler shifts from the dictionary matrix, while keeping the carrier frequency fixed for all these generated shifted satellites codes. This novelty of the decomposed dictionary implementation enabled other GNSS signals to be combined with the GPS signal without large overhead if the two, or more, signals are folded or down-converted to the same intermediate frequency. The fourth method is, therefore, implemented for the first time, a novel compressive sensing software receiver that acquires both GPS and Galileo signals simultaneously. The performance of this method is as good as that of a Matched Filter implementation performance. However, this implementation achieves a saving of 50% in processing time and produces a fine frequency for the Doppler shift at resolution within 10Hz. Our experimental results, based on actual RF captured signals and other simulation environments, have proven that all above seven implementation methods produced by this thesis retain much valuable battery energy and processing resources onboard Smartphones.

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ElRif, Paul. "An examination of matched acquisition and recall modes versus mismatched acquisition and recall modes /". Thesis, Connect to Dissertations & Theses @ Tufts University, 1999.

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Thesis (Ph.D.)--Tufts University, 1999.
Adviser: Salvatore Soraci. Submitted to the Dept. of Psychology. Includes bibliographical references (leaves 174-183). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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4

Alberts, Henry Celler. "Redesigning the United States Defence Acquisition System". Thesis, City University London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282070.

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Greenberg, Robert Joseph 1957. "A program translator software solution for remote data acquisition". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276595.

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A software solution was developed for remote data acquisition applications, i.e., applications where line power is unavailable. The solution was developed in response to a lack of suitable software for environmental measurements using battery powered computers. The software solution is in the form of a program translator that creates programs dedicated to specific remote data acquisition applications from a dialect governed by specific rules. A methodology is presented for defining real-time measurement applications based upon three time components: a scanning interval, an average period, and an averaging interval. The software solution is termed ADAPT, an acronym for 'All-purpose Data Acquisition Program Translator'. ADAPT was written for a Hewlett-Packard hand-held computer, the HP-71, and a Hewlett-Packard data acquisition system, the HP-3421A. The methodology and algorithms may be applied to other computer and data acquisition systems.

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Patel, Jitendra M. "Automatic acquisition of knowledge for solving analysis tasks". Thesis, Open University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329567.

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Karunananda, Asoka S. "Investigating the use of metaphors for knowledge acquisition". Thesis, Keele University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262379.

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A major phase in the construction of Knowledge-Based Systems (KBSs) is the Knowledge Acquisition stage. It involves acquiring knowledge from experts, books, examples and from other relevant sources. Until recently, researchers assumed a simplistic view of knowledge which required it being 'extracted' or 'mined' from experts. It is now clear that this simplistic view ignored the rich epistemological, cognitive and perceptual basis of what we refer to as knowledge. This thesis set about to address this problem. It identifies domain analysis as an early stage in the knowledge acquisition process and argues that it should capture the expert's perception of the domain, rather than the knowledge engineer's view of the expert's perception. It puts forward the thesis that metaphors are invaluable cognitive devices for perceiving and articulating domains. This idea has been postulated by several other researchers but never, until now, tested. This thesis prescribes a novel method for exploiting metaphors for knowledge acquisition. The method is based on Black's interaction view of metaphors which has been merged with Kelly's personal construct psychology. We have implemented a tool, DAKUM, based on this new method and evaluated the usefulness of metaphors for knowledge acquisition. We conclude that metaphors are useful for constructing a domain's functions and structure. However, we note that metaphors are only useful, when describing Juzzy domains; their use in describing relatively organised domains could often lead to confusion. Metaphorically speaking, we conclude that using metaphors is analogous to using a walking stick. The latter is only useful when it is needed; otherwise its use is often a hindrance.

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Ellis, Mary Kay, Luqi i David A. Gaitros. "Computer-Aided Prototyping Systems (CAPS) within the software acquisition process: a case study". Thesis, Monterey, California: Naval Postgraduate School, 1993. http://hdl.handle.net/10945/24130.

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Beauchel, Virginia Bernstrom. "Patterns of Arizona high schools' acquisition and use of microcomputer software". Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185045.

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The purpose of this study was to examine the patterns of acquisition and use of microcomputer software in Arizona high school library media centers, and to determine the selection procedures used by the library media specialists or other designated personnel responsible for the library media centers. The instrument used in this study was a survey developed and reviewed by a committee of school library media specialists. Subjects selected as the target population were 130 Arizona high school library media specialists. The procedures used for testing the 13 hypotheses were: (1) point biserial correlation coefficients, (2) t-tests, and (3) frequency distributions. Significant findings were indicated for the analysis of data of six hypotheses. The conclusions are summarized as follows: (1) As the size of the student body increases, the availability of microcomputer software for library management purposes also increases. (2) As the size of the library media budget increases the availability of microcomputer software for library management purposes also increases. (3) A negative relationship between the size of the library media center budget and the intention to obtain microcomputer software for school-wide purposes presented an anomaly for the intuitive approach to the analysis. (4) The methods chosen for evaluating and selecting microcomputer software varied significantly for each type of software selected. (5) Cell means indicated that for each type of library management programs obtained by the library media center, three school-wide programs were obtained. (6) Microcomputer software is utilized in the library media center more than in either classroom or in computer labs. Recommendations for additional investigation were discussed.

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Chueke, J. "Perceptible affordances and feedforward for gestural interfaces : assessing effectiveness of gesture acquisition with unfamiliar interactions". Thesis, City, University of London, 2016. http://openaccess.city.ac.uk/15762/.

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The move towards touch-based interfaces disrupts the established ways in which users manipulate and control graphical user interfaces. The predominant mode of interaction established by the desktop interface is to ‘double-click’ an icon in order to open an application, file or folder. Icons show users where to click and their shape, colour and graphic style suggests how they respond to user action. In sharp contrast, in a touch-based interface, an action may require a user to form a gesture with a certain number of fingers, a particular movement, and in a specific place. Often, none of this is suggested in the interface. This thesis adopts the approach of research through design to address the problem of how to inform the user about which gestures are available in a given touch-based interface, how to perform each gesture, and, finally, the effect of each gesture on the underlying system. Its hypothesis is that presenting automatic and animated visual prompts that depict touch and preview gesture execution will mitigate the problems users encounter when they execute commands within unfamiliar gestural interfaces. Moreover, the thesis claims the need for a new framework to assess the efficiency of gestural UI designs. A significant aspect of this new framework is a rating system that was used to assess distinct phases within the users’ evaluation and execution of a gesture. In order to support the thesis hypothesis, two empirical studies were conducted. The first introduces the visual prompts in support of training participants in unfamiliar gestures and gauges participants’ interpretation of their meaning. The second study consolidates the design features that yielded fewer error rates in the first study and assesses different interaction techniques, such as the moment to display the visual prompt. Both studies demonstrate the benefits in providing visual prompts to improve user awareness of available gestures. In addition, both studies confirm the efficiency of the rating system in identifying the most common problems users have with gestures and identifying possible design features to mitigate such problems. The thesis contributes: 1) a gesture-and-effect model and a corresponding rating system that can be used to assess gestural user interfaces, 2) the identification of common problems users have with unfamiliar gestural interfaces and design recommendations to mitigate these problems, and 3) a novel design technique that will improve user awareness of unfamiliar gestures within novel gestural interfaces.

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Ransbotham, III Samuel B. "Acquisition and diffusion of technology innovation". Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28094.

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Thesis (M. S.)--Management, Georgia Institute of Technology, 2008.
Committee Chair: Sabyasachi Mitra; Committee Member: Frank Rothaermel; Committee Member: Sandra Slaughter; Committee Member: Sridhar Narasimhan; Committee Member: Vivek Ghosal.

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Graves, Jamie Robert. "Forensic verification of operating system activity via novel data, acquisition and analysis techniques". Thesis, Edinburgh Napier University, 2009. http://researchrepository.napier.ac.uk/Output/6699.

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Digital Forensics is a nascent field that faces a number of technical, procedural and cultural difficulties that must be overcome if it is to be recognised as a scientific discipline, and not just an art. Technical problems involve the need to develop standardised tools and techniques for the collection and analysis of digital evidence. This thesis is mainly concerned with the technical difficulties faced by the domain. In particular, the exploration of techniques that could form the basis of trusted standards to scientifically verify data. This study presents a set of techniques, and methodologies that can be used to describe the fitness of system calls originating from the Windows NT platform as a form of evidence. It does so in a manner that allows for open investigation into the manner in which the activities described by this form of evidence can be verified. The performance impact on the Device Under Test (DUT) is explored via the division of the Windows NT system calls into service subsets. Of particular interest to this work is the file subset, as the system calls can be directly linked to user interaction. The subsequent quality of data produced by the collection tool is examined via the use of the Basic Local Alignment Search Tool (BLAST) sequence alignment algorithm . In doing so, this study asserts that system calls provide a recording, or time line, of evidence extracted from the operating system, which represents actions undertaken. In addition, it asserts that these interactions can be compared against known profiles (fingerprints) of activity using BLAST, which can provide a set of statistics relating to the quality of match, and a measure of the similarities of sequences under scrutiny. These are based on Karlin-Altschul statistics which provides, amongst other values, a P-Value to describe how often a sequence will occur within a search space. The manner in which these statistics are calculated is augmented by the novel generation of the NM1,5_D7326 scoring matrix based on empirical data gathered from the operating system, which is compared against the de facto, biologically generated, BLOSUM62 scoring matrix. The impact on the Windows 2000 and Windows XP DUTs of monitoring most of the service subsets, including the file subset, is statistically insignificant when simple user interactions are performed on the operating system. For the file subset, p = 0.58 on Windows 2000 Service Pack 4, and p = 0.84 on Windows XP Service Pack 1. This study shows that if the event occurred in a sequence that originated on an operating system that was not subjected to high process load or system stress, a great deal of confidence can be placed in a gapped match, using either the NM_I.5~7326 or BLOSUM62 scoring matrices, indicating an event occurred, as all fingerprints of interest (FOI) were identified. The worst-case BLOSUM62 P-Value = 1.10E-125, and worst-case NM1.5_D7326 P-Value = 1.60E-72, showing that these matrices are comparable in their sensitivity during normal system conditions. This cannot be said for sequences gathered during high process load or system stress conditions. The NM1.5_D7326 scoring matrix failed to identify any FOI. The BLOSUM62 scoring matrix returned a number of matches that may have been the FOI, as discerned via the supporting statistics, but were not positively identified within the evaluation criteria. The techniques presented in this thesis are useful, structured and quantifiable. They provide the basis for a set of methodologies that can be used for providing objective data for additional studies into this form of evidence, which can further explore the details of the calibration and analysis methods, thus supplying the basis for a trusted form of evidence, which may be described as fit-for-purpose.

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Plant, Robert T. "A methodology for knowledge acquisition in the development of expert systems". Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240378.

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Nicholson, Clive. "Knowledge acquisition for knowledge-based systems : an empirical comparison of two methods". Thesis, University of Southampton, 1992. https://eprints.soton.ac.uk/425631/.

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Amuah, James Fisher. "KAT-MeD : a task and model driven knowledge acquisition tool for medical diagnosis". Thesis, University of Greenwich, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335648.

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Ransbotham, Samuel B. III. "Acquisition and diffusion of technology innovation". Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28094.

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In the first essay, I examine value created through external acquisition of nascent technology innovation. External acquisition of new technology is a growing trend in the innovation process, particularly in high technology industries, as firms complement internal efforts with aggressive acquisition programs. Yet, despite its importance, there is little empirical research on the timing of acquisition decisions in high technology environments. I examine the impact of target age on value created for the buyer. Applying an event study methodology to technology acquisitions in the telecommunications industry from 1995 to 2001, empirical evidence supports acquiring early in the face of uncertainty. The equity markets reward the acquisition of younger companies. In sharp contrast to the first essay, the second essay examines the diffusion of negative innovations. While destruction can be creative, certainly not all destruction is creative. Some is just destruction. I examine two fundamentally different paths to information security compromise an opportunistic path and a deliberate path. Through a grounded approach using interviews, observations, and secondary data, I advance a model of the information security compromise process. Using one year of alert data from intrusion detection devices, empirical analysis provides evidence that these paths follow two distinct, but interrelated diffusion patterns. Although distinct, I find empirical evidence that these paths both converge and escalate. Beyond the specific findings in the Internet security context, the study leads to a richer understanding of the diffusion of negative technological innovation. In the third essay, I build on the second essay by examining the effectiveness of reward-based mechanisms in restricting the diffusion of negative innovations. Concerns have been raised that reward-based private infomediaries introduce information leakage which decreases social welfare. Using two years of alert data, I find evidence of their effectiveness despite any leakage which may be occurring. While reward-based disclosures are just as likely to be exploited as non-reward-baed disclosures, exploits from reward-based disclosures are less likely to occur in the first week after disclosure. Further the overall volume of alerts is reduced. This research helps determine the effectiveness of reward mechanisms and provides guidance for security policy makers.

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Heasman, Ray Edward. "The implementation of a core architecture for geophysical data acquisition". Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1005256.

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This thesis describes the design, development and implementation of the core hardware and software of a modular data acquisition system for geophysical data collection. The primary application for this system is the acquisition and realtime processing of seismic data captured in mines. This system will be used by a commercial supplier of seismic instrumentation, ISS International, as a base architecture for the development of future products. The hardware and software has been designed to be extendable and support distributed processing. The IEEE-1394 High Performance Serial Bus is used to communicate with other CPU modules or peripherals. The software includes a pre-emptive multitasking microkernel, an asynchronous mailbox-based message passing communications system, and a functional IEEE-1394 protocol stack. The reasons for the end design and implementation decisions are given, and the problems encountered in the development of this system are described. A critical assessment of the match between the requirements for the project and the functionality of the implementation is made.

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Manaf, Afwarman 1962. "Constraint-based software for broadband networks planninga software framework for planning with the holistic approach /". Monash University, Dept. of Electrical and Computer Systems Engineering, 2000. http://arrow.monash.edu.au/hdl/1959.1/8163.

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Hu, Ganglan Information Systems Technology &amp Management Australian School of Business UNSW. "Decision-making criteria for software requirements selection: an empirical study in China". Awarded by:University of New South Wales. School of Information Systems, Technology and Management, 2006. http://handle.unsw.edu.au/1959.4/25980.

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This study aims to explore the decision-making criteria for requirements selection in market-driven software development projects in China. Requirements selection decisions are made by reconciling the conflicting stakeholders??? value propositions into a mutually-agreed set through the negotiation and communication process between stakeholders. Firstly, this study identified decision-making criteria according to different stakeholders??? value propositions, and then evaluated the importance of the criteria when making the decisions of requirements selection. Moreover, the study determined the degree to which the stakeholders from business, product, and project perspectives influence the decision-making process. Furthermore, the study explored the communication between major stakeholders in requirements selection process, as a foundation to support and guide the process. A Delphi survey was applied in this study. Opinions from experienced industrial experts were obtained to achieve reliable consensus among them on the criteria and relative importance of the criteria in requirements selection process. The Delphi survey in this study included four phases of data collection by a series of intensive questionnaires interspersed with controlled opinion feedback and follow-up interviews. 132 Experts from 11 companies were recruited by following the rigid procedure to ensure the validity and reliability of the research. The study indicated that criteria from the business perspective had a major influence on decision-making of requirements selection, while project- and product-perspective criteria were relatively lower in priority. However, there were some inconsistencies among the opinions of the recruited experts regarding the importance of the criteria. The inconsistencies may result from a number of different factors, for example; different software development projects; different size, culture, organizational structure or maturity level of the companies; or different working positions of the experts surveyed. In addition, the study found three different types of communication in requirements selection in the companies surveyed. Further, Chinese culture was believed to have effects on the communication process between stakeholders. While informal communication was highlighted in Chinese context, the Chinese culture of strictly hierarchical communication could lead to problems in the communication process. Further research is recommended to gain deeper insight into these issues.

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Manaf, Afwarman 1962. "Constraint-based software for broadband networks planning : a software framework for planning with the holistic approach". Monash University, Dept. of Electrical and Computer Systems Engineering, 2000. http://arrow.monash.edu.au/hdl/1959.1/7754.

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Auclair, Christian. "Promoting the acquisition of active knowledge with the use of computer multimedia : establishing a theoretical basis for guidelines in instructional software design". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35199.

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The multimedia computer is a relatively new product that is capable of presenting information through a variety of media such as text, animation, video & sound. Commercial developers, researchers and other multimedia advocates have been making claims about the potential for multimedia in promoting learning and, consequently, its beneficial uses as a learning tool within the classroom. This study investigates the conditions under which the organization and coordination of multimedia sources promotes the acquisition of knowledge. Based upon a review of the literature, five hypotheses are generated with respect to the development of instructional software as an effective learning tool. These hypotheses are then tested in a study that looks at the effects of various multimedia designs. One hundred students, half of high-ability (i.e., high-stream) and the other half of average ability (i.e., regular stream), were assigned to one of five multimedia conditions (e.g., text only (T); text with animation (TA); text with animations and captions (TAC); animations and captions (AC); refined animation and captions (RAC)). The instructional material presented information on how to find South using two sticks, some string and the Sun. The TAC and RAC groups outperformed the other three groups on scores of verbal recall, visual recall, and enactment of the main procedures. These two groups also obtained higher scores on detailed analyses of written recalls. Finally, interaction effects for stream level and computer presentation group were also obtained. The results from this study are contrasted to those of an earlier study by Breuleux et al. (1993). The implications of these results are discussed in terms of statistical support for theoretically based guidelines for the development and design of effective instructional multimedia.

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Yildirim, Pinar. "Acquisition Of Liver Specific Parasites-bacteria-drugs-diseases-genes Knowledge From Medline". Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613143/index.pdf.

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Biomedical literature such as MEDLINE articles are rich resources for discovering and tracking disease and drug knowledge. For example, information regarding the drugs that are used with a particular disease or the changes in drug usage over time is valulable. However, this information is buried in thousands of MEDLINE articles. Acquiring knowledge from these articles requires complex processes depending on the biomedical text mining techniques. Today, parasitic and bacterial diseases affect hundreds of millions of people worldwide. They result in significant mortality and devastating social and economic consequences. There are many control and eradication programs conducted in the world. Also, many drugs are developed for diseases caused from parasites and bacteria. In this study, research was conducted of parasites (bacteria affecting the liver) and treatment drugs were tested. Also, relationships between these diseases and genes, along with parasites and bacteria were searched through data and biomedical text mining techniques. This study reveals that the treatment of parasites and bacteria seems to be stable over the last four decades. The methodology introduced in this study also presents a reference model to acquire medical knowledge from the literature.

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Pinar, Adem. "Management Tool Support For Software Acquisition And Information Systems Outsourcing Projects For Turkish Land Forces Command". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605334/index.pdf.

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This thesis reviews the software acquisition models and management tools used for managing, tracking and planning the acquisition projects all around the world. Then the requirements of Turkish Land Forces Command (TLFC) for a project management tool are considered. Features of a project management tool that is suitable for TLFC are determined through the ideas of TLFC personnel of IS department. After evaluation of selected tools through the requirements of TLFC the best one is presented. Then an interface module is developed through the requirements of the current acquisition process of TLFC for effective usage of the tool. Finally the study is evaluated.

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Marcińczuk, Michał. "Pattern Acquisition Methods for Information Extraction Systems". Thesis, Blekinge Tekniska Högskola, Avdelningen för programvarusystem, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4291.

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This master thesis treats about Event Recognition in the reports of Polish stockholders. Event Recognition is one of the Information Extraction tasks. This thesis provides a comparison of two approaches to Event Recognition: manual and automatic. In the manual approach regular expressions are used. Regular expressions are used as a baseline for the automatic approach. In the automatic approach three Machine Learning methods were applied. In the initial experiment the Decision Trees, naive Bayes and Memory Based Learning methods are compared. A modification of the standard Memory Based Learning method is presented which goal is to create a classifier that uses only positives examples in the classification task. The performance of the modified Memory Based Learning method is presented and compared to the baseline and also to other Machine Learning methods. In the initial experiment one type of annotation is used and it is the meeting date annotation. The final experiment is conducted using three types of annotations: the meeting time, the meeting date and the meeting place annotation. The experiments show that the classification can be performed using only one class of instances with the same level of performance.
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Bel, Bernard. "Acquisition et représentation de connaissances en musique". Phd thesis, Aix-Marseille 3, 1990. http://tel.archives-ouvertes.fr/tel-00009692.

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Cette étude traite de la représentation informatique de connaissances en musique, abordée à partir de deux expériences en grandeur réelle. La première est une méthode d'acquisition de connaissances en ethnographie mettant en interaction un expert (le musicien), un analyste (le musicologue) et une machine dans une situation d'apprentissage. Les schémas d'improvisation des musiciens sont identifiés et exprimés à l'aide de règles de production dans un formalisme dérivé des grammaires génératives et des langages de formes. Un algorithme déterministe de test d'appartenance de chaînes arbitraires au langage défini par une grammaire (sensible au contexte) est présenté, ainsi qu'une technique d'inférence inductive de langages réguliers permettant l'acquisition automatique de connaissances lexicales et syntaxiques. La seconde expérience s'insère dans l'élaboration d'un environnement de composition musicale assistée par ordinateur. Le problème est ici la représentation du temps dans une structure discrète d'“objets temporels”, et plus généralement la synchronisation de processus parallèles. Une méthode est proposée pour la détermination d'une structure à partir de données incomplètes sur la synchronisation des objets. La notion d'“objet sonore” est ensuite explicitée formellement. Un algorithme efficace permet l'instanciation des objets sonores affectés à une structure en tenant compte des contraintes liées à leurs propriétés métriques et topologiques.

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Everhart, Julie M. "The Effects Of Computer-Based Practice On The Acquisition Of Basic Academic Skills In Children Who Have Moderate To Intensive Educational Needs". The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250469942.

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Pearcy, Charles M. "The impact of background resolution on Target Acquisitions Weapons Software (TAWS) sensor performance". Thesis, Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2232.

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Approved for public release, distribution is unlimited
This study evaluated the sensitivity of TAWS detection range calculations to the spatial resolution of scenario backgrounds. Sixteen independent sites were analyzed to determine TAWS background. Multispectral satellite data were processed to different spatial resolutions from 1m to 8km. The resultant imagery was further processed to determine TAWS background type. The TAWS background type was refined to include soil moisture characteristics. Soil moisture analyses were obtained using in situ measurements, the Air Force's Agricultural-Meteorological (AGRMET) model and the Army's Fast All-seasons Soil Strength (FASST) model. The analyzed imagery was compared to the current default 1o latitude by 1o of longitude database in TAWS. The use of the current default TAWS background database was shown to result in TAWS ranges differing from the 1m standard range by 18-23%. The uncertainty was reduced to 5% when background resolution was improved to 8km in rural areas. By contrast, in urban regions the uncertainty was reduced to 14% when spatial resolution was reduced to 30m. These results suggest that the rural and urban designations are important to the definition of a background database.
First Lieutenant, United States Air Force

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28

Brottier, Erwan. "Acquisition et analyse des exigences pour le développement logiciel : une approche dirigée par les modèles". Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00512174.

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Dans cette thèse, nous nous intéressons à la définition d'une plate-forme industrielle favorisant une meilleure intégration des techniques de vérification et de validation des exigences au sein des processus de développement. Cette plate-forme, appelée R2A (pour Requirements To Analysis) est entièrement construite à l'aide de technologies issues de l'ingénierie dirigée par les modèles. Le cœur de la plate-forme est un processus de composition de modèles à deux niveaux de modélisation. Au niveau instance, il produit une spécification globale des exigences à partir d'une collection de spécifications d'exigences partielles, hétérogènes et potentiellement incohérentes. Au niveau de la conception de la plate-forme (niveau meta), il produit le formalisme interne de la plate-forme (types d'information pouvant être capturée et fonctionnalités supportées) à partir de composants de conception embarquant des sémantiques opérationnelles, de composition et de déploiement. Ce processus favorise l'adaptabilité de la plate-forme à des contextes industriels variés. L'obtention d'une spécification globale des exigences (i) autorise l'application des techniques modernes de vérification et de validation pour la détection d'incohérences et (ii) favorise une approche de développement dirigée par les modèles (MDD) dès les premières étapes du développement logiciel (synchronisation exigences et artefacts de développement aval). Dans sa version actuelle, la plate-forme est spécialisée pour le contexte industriel de France Télécom. Elle supporte quatre langages de description des exigences : les diagrammes d'activité et de classes UML, un langage naturel contraint (le RDL, pour Requirements Description Language) et son formalisme interne (le RM, pour Requirements Metamodel). Les fonctionnalités principales sont (i) la génération d'objectifs de test système, (ii) la production d'une première spécification d'analyse et (iii) la vérification de la cohérence des exigences.

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29

Magluf, Lillyane Raquel Freitas. "Contribuições para a criação de um software aplicativo para a terapia fonoaudiológica de crianças com atraso simples de linguagem". Universidade Católica de Pernambuco, 2009. http://www.unicap.br/tede//tde_busca/arquivo.php?codArquivo=399.

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Devido à possibilidade do atraso simples de linguagem causar dificuldades, além das comunicativas, sociais, emocionais e cognitivas, e de ser indicado como fator causal dos distúrbios de aprendizagem, e tendo em vista que muitos recursos utilizados na clínica fonoaudiológica para terapia de crianças com esse distúrbio de linguagem constituem adaptações de métodos desenvolvidos para outros fins, surgiu o interesse em desenvolver a presente pesquisa. O objetivo deste estudo é propor diretrizes que auxiliem o desenvolvimento de um software aplicativo para a fonoterapia de crianças com atraso de simples linguagem. De acordo com a experiência profissional de 10 fonoaudiólogos, foram levantados os instrumentos mais utilizados para a terapia fonoaudiológica do atraso simples de linguagem e a partir do estudo das características positivas e negativas dos instrumentos listados pelos entrevistados, são apresentadas contribuições para a criação do um software aplicativo. Deseja-se, com as diretrizes levantadas, a criação de um instrumento específico, prático e confiável que possa ser utilizado como apoio a fonoterapia do atraso simples de linguagem
Sem abstract

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30

Bailey, Stacey M. "Content Assessment in Intelligent Computer-aided Language Learning: Meaning Error Diagnosis for English as a Second Language". Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1204556485.

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31

Nelson, Wade, i Diana Shurtleff. "Bridging The Gap Between Telemetry and the PC". International Foundation for Telemetering, 1988. http://hdl.handle.net/10150/615216.

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International Telemetering Conference Proceedings / October 17-20, 1988 / Riviera Hotel, Las Vegas, Nevada
The explosive use and extensive development of software and hardware for the IBM PC and PC Clones over the past few years has positioned the PC as one of many viable alternatives to system designers configuring systems for both data acquisition and data analysis. Hardware abounds for capturing signals to be digitized and analyzed by software developed for the PC. Communication software has improved to where system developers can easily link instrumentation devices together to form integrated test environments for analyzing and displaying data. Telemetry systems, notable those developed for lab calibration and ground station environments, are one of many applications which can profit from the rapid development of data acquisition techniques for the PC. Recently developed for the ADS100A telemetry processor is a data acquisition module which allows the system to be linked into the PC world. The MUX-I/O module was designed to allow the PC access to telemetry data acquired through the ADS 100A, as well as provide a method by which data can be input into the telemetry environment from a host PC or equivalent RS-232 or GPIB interface. Signals captured and digitized by the ADS100A can be passed on to the PC for further processing and/or report generation. Providing interfaces of this form to the PC greatly enhances the functionality and scope of the abilities already provided by the ADS100A as one of the major front-end processors used in telemetry processing today. The MUX-I/O module helps "bridge the gap" between telemetry and the PC in an ever increasing demand for improving the quantity and quality of processing power required by today's telemetry environment. This paper focuses on two distinct topics, how to transfer data to and from the PC and what off-the-shelf software is available to provide communication links and analysis of incoming data. Major areas of discussion will include software protocols, pre vs post processing, static vs dynamic processing environments, and discussion of the major data analysis and acquisition packages available for the PC today, such as DaDisp and Lotus Measure, which aid the system designer in analyzing and displaying telemetry data. Novel applications of the telemetry to PC link will be discussed.

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32

Badra, Fadi. "Extraction de connaissances d'adaptation en raisonnement à partir de cas". Phd thesis, Université Henri Poincaré - Nancy I, 2009. http://tel.archives-ouvertes.fr/tel-00438140.

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Cette thèse se situe à l'intersection de trois domaines de recherche : le raisonnement à partir de cas, l'extraction de connaissances et la représentation des connaissances. Raisonner à partir de cas consiste à résoudre un nouveau problème en utilisant un ensemble de problèmes déjà résolus, appelés cas. Dans cette thèse, un langage de représentation des variations entre cas est introduit. Nous montrons comment ce langage peut être utilisé pour représenter les connaissances d'adaptation et pour modéliser la phase d'adaptation en raisonnement à partir de cas. Ce langage est ensuite appliqué à la tâche d'apprentissage de connaissances d'adaptation. Un processus d'extraction de connaissances, appelé CabamakA, est mis au point. Ce processus permet d'apprendre des connaissances d'adaptation par généralisation à partir d'une représentation des variations entre cas. Une discussion est ensuite menée sur les conditions d'opérationnalisation de CabamakA au sein d'un processus d'acquisition de connaissances. L'étude aboutit à la proposition d'un nouveau type d'approche pour l'acquisition de connaissances d'adaptation dans lequel le processus d'extraction de connaissances est déclenché de manière opportuniste au cours d'une session particulière de résolution de problèmes. Les diérents concepts introduits dans la thèse sont illustrés dans le domaine culinaire à travers leur application au système de raisonnement à partir de cas Taaable, qui constitue le contexte applicatif de l'étude.

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33

Charles, Smith. "Conception d'un Système Expert pour l'étude de la Sécurité Incendie de Bâtiments dans un Contexte Pluridisciplinaire". Phd thesis, INSA de Lyon, 1992. http://tel.archives-ouvertes.fr/tel-00003554.

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Cette thèse étudie les possibilités offertes par l'intelligence artificielle pour l'identification et la circonscription des risques incendie de bâtiments.La sécurité incendie est une composante de la fonction technique du bâtiment. Elle peut donc être considérée dès la conception. Actuellement elle est traitée principalement par l'application de textes réglementaires. Nous proposons une approche différente ayant deux caractéristiques principales : premièrement elle privilégie la recherche des facteurs de risque et des meilleurs moyens de les éliminer ; deuxièmement elle est globale parce qu'elle réalise une intégration des connaissances (expertes ou autres) relatives aux autres fonctions du bâtiment (Architecture et Economie) ainsi qu'aux autres composantes de la fonction technique.La recherche a donc porté principalement sur : – La définition d'une méthode d'étude globale de la sécurité incendie du bâtiment, car les connaissances sont peu formalisées dans ce domaine. – La définition d'une méthodologie de réalisation d'un système multi-expert opérationnel et à caractère pédagogique.Les résultats des travaux présentés sont de deux types : – Un ensemble d'outils tels que TRIAGE, ARBRE, NASS, ICONOGRAPH. TRIAGE est le système destiné aux études pluridisciplinaires de la sécurité incendie de bâtiments. Deux modes de fonctionnement sont disponibles : l'expertise focalisée où l'utilisateur requiert un service à un spécialiste de manière isolée ; l'expertise générale où l'utilisateur est pris en main par un planificateur de tâches en fonction des buts fixés. ARBRE est un outil destiné aux experts pour la mise au point d'arbres des causes à probabilités subjectives (appelées crédits d'hypothèses). NASS est un environnement de développement de systèmes experts basés sur l'exploitation de multiples sources de connaissances exprimées en langage quasi naturel. Il contient, entre autres, le mécanisme de raisonnement de TRIAGE. ICONOGRAPH est un outil graphique pour la gestion des relations entre les objets d'un univers de discours structuré. Il met en oeuvre un modèle auto-organisationnel (dit à règles de mutation structurelle) fonction de l'univers considéré. – L'ensemble des éléments méthodologiques qui ont été mis en oeuvre pour arriver aux outils cités. Notamment, nous proposons une technique que nous appelons sémographie. Son rôle est d'orienter le concepteur de système expert sur la nature des connaissances à introduire dans un système expert et sur la façon de les acquérir. Basée sur la systémique et l'ergonomie cognitive, la sémographie apporte des modèles de structuration de l'univers du discours des experts et des techniques pour provoquer et analyser le discours lui-même.

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34

Anvar, Shebli. "METHODOLOGIE DE DEVELOPPEMENT ET DE MODELISATION UML DES SYSTEMES D'ACQUISITION ET DE TRAITEMENT EN TEMPS REEL POUR LES EXPERIENCES DE PHYSIQUE DES HAUTES ENERGIES". Phd thesis, Université Paris Sud - Paris XI, 2002. http://tel.archives-ouvertes.fr/tel-00002854.

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La complexité croissante des systèmes d'acquisition et de traitement en temps réel (TDAQ) pour les expériences de physique des hautes énergies appelle à une évolution ad hoc des outils de développement. Dans cet ouvrage, nous traitons de l'articulation entre la spécification de principe des systèmes TDAQ et leur conception/réalisation sur une plateforme matérielle et logicielle concrète. Notre travail repose sur la définition d'une méthodologie de développement des systèmes TDAQ qui réponde aux problématiques de développements particulières à ces systèmes. Il en résulte la spécification détaillée d'un « canevas méthodologique » basé sur le langage UML, destiné à encadrer un processus de développement. L'usage de ce canevas méthodologique UML doit permettre la mise en place progressive d'un canevas « maison », c'est-à-dire un atelier de développement comprenant des composants réutilisables et des éléments d'architecture génériques adaptés aux applications TDAQ. L'ouvrage s'articule autour de 4 sections principales. La section II est dévolue à la caractérisation et à l'évolution des systèmes TDAQ. En section III, nous nous intéressons aux technologies pertinentes pour notre problématique, notamment les techniques de réutilisation logicielle telles les motifs récurrents (design patterns) et les canevas (frameworks), avec une orientation en faveur des domaines du temps réel et de l'embarqué. Notre apport conceptuel spécifique est exposé en section IV, où nous procédons notamment à la spécification détaillée, formalisée et exemples à l'appui, de notre modèle de développement. Enfin, nous terminons notre propos en section V en évoquant le projet de R&D MORDICUS de mise en œuvre concrète de notre canevas méthodologique UML, ainsi que les développements récents de l'OMG (Object Management Group) sur l'architecture orientée modèles (Model Driven Architecture), particulièrement en résonance avec notre travail.

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35

Raguindin, Ferdinand M. "Selecting a software capability evaluation for weapons acquisition". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA289788.

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Thesis (M.S. in Management) Naval Postgraduate School, September 1994.
Thesis advisor(s): Martin J. McCaffrey, James Emery. "September 1994." Includes bibliographical references. Also available online.

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36

Powell, Richard, i Jeff Kuhn. "HARDWARE- VS. SOFTWARE-DRIVEN REAL-TIME DATA ACQUISITION". International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/608291.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California
There are two basic approaches to developing data acquisition systems. The first is to buy or develop acquisition hardware and to then write software to input, identify, and distribute the data for processing, display, storage, and output to a network. The second is to design a system that handles some or all of these tasks in hardware instead of software. This paper describes the differences between software-driven and hardware-driven system architectures as applied to real-time data acquisition systems. In explaining the characteristics of a hardware-driven system, a high-performance real-time bus system architecture developed by L-3 will be used as an example. This architecture removes the bottlenecks and unpredictability that can plague software-driven systems when applied to complex real-time data acquisition applications. It does this by handling the input, identification, routing, and distribution of acquired data without software intervention.

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37

Wallace, Julia. "Quantum computer software". Thesis, University of Exeter, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369975.

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38

Pei, Breivold Hongyu. "Software Architecture Evolution and Software Evolvability". Licentiate thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-4540.

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Software is characterized by inevitable changes and increasing complexity, which in turn may lead to huge costs unless rigorously taking into account change accommodations. This is in particular true for long-lived systems. For such systems, there is a need to address evolvability explicitly during the entire lifecycle, carry out software evolution efficiently and reliably, and prolong the productive lifetime of the software systems.

In this thesis, we study evolution of software architecture and investigate ways to support this evolution. The central theme of the thesis is how to analyze software evolvability, i.e. a system’s ability to easily accommodate changes. We focus on several particular aspects: (i) what software characteristics are necessary to constitute an evolvable software system; (ii) how to assess evolvability in a systematic manner; (iii) what impacts need to be considered given a certain change stimulus that results in potential requirements the software architecture needs to adapt to, e.g. ever-changing business requirements and advances of technology.

To improve the capability in being able to on forehand understand and analyze systematically the impact of a change stimulus, we introduce a software evolvability model, in which subcharacteristics of software evolvability and corresponding measuring attributes are identified. In addition, a further study of one particular measuring attribute, i.e. modularity, is performed through a dependency analysis case study.

We introduce a method for analyzing software evolvability at the architecture level. This is to ensure that the implications of the potential improvement strategies and evolution path of the software architecture are analyzed with respect to the evolvability subcharacteristics. This method is proposed and piloted in an industrial setting.

The fact that change stimuli come from both technical and business perspectives spawns two aspects that we also look into in this research, i.e. to respectively investigate the impacts of technology-type and business-type of change stimuli.

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39

Zheng, Sophia. "Signal Acquisition and Tracking for a Software Gps Receiver". Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/31291.

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Global Positioning System (GPS) is a satellite-based navigation system that has been used widely both in civilian and military for positioning, navigation, timing and other position related applications. The hardware-based GPS receivers provide the least user flexibility. Thus, it is necessary to have Software-based GPS receivers for easy and quick implementation, simulation and analysis of algorithms. Software-based GPS receiver processes the GPS signal at the radio frequency or intermediate frequency depending on the hardware configuration of the receiver. In this development of the acquisition and tracking processes of the software receiver, the front-end device that converts the radio frequency signal from the antenna to an intermediate frequency is the Mitel 2021 GPS receiver board. An analog-to-digital (A/D) converter then digitizes the output signal from the RF front-end. The data is then processed using MATLAB programs to achieve acquisition and tracking of the GPS signals. The software GPS receiver can perform acquisition and tracking using different parameters and threshold values. This flexibility of operation allows weaker signals to be tracked and processed. In this software receiver design, the focus is on the acquisition and tracking of L1 band C/A code GPS signals used by most civilian applications. The purpose of this thesis is to develop the acquisition and tracking algorithms to extract the navigation data bits from the raw GPS signals. The navigation data bits provide all the necessary information to compute the pseudorange between the receiver and the visible satellites and determine the receiver location. Both MATLAB simulated GPS data and realistic GPS signals from a GSS 6560 simulator are used to verify the performance of the acquisition and tracking programs. The acquisition program is capable of locating the beginning of the C/A code and the carrier frequency to within the desired accuracy. From the output of the acquisition program, the tracking program can decode the navigation data bits. The tracking algorithm implemented is based on the block adjustment of synchronizing signal (BASS) method.
Master of Science

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40

Vial, Philippe. "Un outil d'aide à l'installation d'UNIX fondé sur les connaissances". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1988. http://tel.archives-ouvertes.fr/tel-00813379.

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La thèse présentée dans ce rapport a été entreprise dans le cadre de la convention CIFRE (Convention Industrielle de Formation par la REcherche) 264/85 établie entre la société SYNC et l'Ecole Nationale Supérieure des Mines de Saint-Etienne. La réalisation de cette thèse a comporté quatre activités très différentes, à savoir: - L' acquisition des connaissances nécessaires à l' administration et à l' installation d'UNIX. - l'acquisition des compétences nécessaires au développement d'un système expert. - le choix d'un environnement de développement de systèmes experts adapté au domaine d'expertise. - la réalisation du système expert pour installer UNIX.

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41

Quinn, Paul. "Computer aided software production". Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317077.

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42

Russ, Keith Mitchell. "Visual data acquisition and computer interpretation /". The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487687485811057.

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43

Guillory, Helen E. (Helen Elizabeth). "Computer Applications to Second Language Acquisition". Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc504628/.

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This thesis is intended to give a panorama of technology in foreign language pedagogy. Although my field of study is French, the computer applications under scrutiny do not relate solely to the teaching of French. This paper begins with a criticism of the rigid listen-and-repeat language laboratory concept while tracking the rise of communicative language learning theory; follows the microprocessor revolution in language consoles; documents the development of computer-assisted instruction; showcases software evaluations of computer-assisted language learning; explores telecommunications; discusses satellite dishes and other computer peripherals; presents the results of a survey of Texas universities; and concludes with the presentation of the evolving language media center.

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44

Sherwood, Patricia Ann. "Inspections : software development process for building defect free software applied in a small-scale software development environment /". Online version of thesis, 1990. http://hdl.handle.net/1850/10598.

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45

Ward, Michael Patrick. "A transputer based scalable data acquisition system". Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318280.

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46

De, Marcken Carl Gustave. "Unsupervised language acquisition". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10640.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
Includes bibliographical references (p. 125-133).
by Carl G. de Marcken.
Ph.D.

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47

DeLong, David James. "Spectral analysis of heart rate variability : acquisition/analysis software development /". Online version of thesis, 1992. http://hdl.handle.net/1850/10858.

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48

Goldman, Eric. "Securing the IT acquisition secruity chain : security concerns and human factors in IT acquisition /". Online version of thesis, 2010. http://hdl.handle.net/1850/12333.

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49

Sayyad, Shirabad Jelber. "Supporting software maintenance by mining software update records". Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/29004.

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It is well known that maintenance is the most expensive stage of the software life cycle. Most large real world software systems consist of a very large number of source code files. Important knowledge about different aspects of a software system is embedded in a rich set of implicit relationships among these files. Those relationships are partly reflected in system documentation at its different levels, but more often than not are never made explicit and become part of the expertise of system maintainers. Finding existing relations between source code components is a difficult task, especially in the case of legacy systems. When a maintenance programmer is looking at a piece of code in a source file, one of the important questions that he or she needs to answer is: "which other files should I know about, i.e. what else might be relevant to this piece of code?". This is an example of a more general Relevance Relation that maps a set of entities in a software system into a relevance value. How can we discover and render explicit these relationships without looking over the shoulder of a programmer involved in a maintenance task? We turn to inductive methods that are capable of extracting structural patterns or models from data. They can learn concepts or models from experience observed in the past to predict outcomes of future unseen cases. This thesis lies at the intersection of two research fields, which has been widely ignored by researchers in the machine learning and software engineering communities. It investigates the application of inductive methods to daily software maintenance at the source code level. Therefore in this thesis we first lay out the general idea of relevance among different entities in a software system. Then using inductive learning methods and a variety of data sources used by maintenance programmers, we extract (i.e. learn) what we call a maintenance relevance relation among files in a large legacy system. In effect we learn from past maintenance experience in the form of problem reports and update records, to be able to make predictions that are useful in future maintenance activities. This relation, which is called the Co-update relation, predicts whether updating one source file may require a change in another file. To learn the Co-update relation we have performed a large number of experiments using syntactic features such as function calls or variable definitions. We have also performed experiments that use text based features such as source code comments and problem reports, and the combination of these features. The results obtained show that while using syntactic features is encouraging in terms of the predictive power of the results of learning, using text based features yields highly accurate models, with precision and recall measures that make these models viable to be used in a real world setting. As part of the contribution of this thesis we also report on challenges encountered in the process and the lessons learned.

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50

Hochstettler, William Henry. "A model for supporting multiple software engineering methods in a software environment /". The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487322984315003.

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