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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Improving the quality of bug data in software repositories

Auwal, Bilyaminu Romo January 2016 (has links)
Context : Researchers have increasingly recognised the benefit of mining software repositories to extract information. Thus, integrating a version control tool (VC tool) and bug tracking tool (BT tool) in mining software repositories as well as synchronising missing bug tracking data (BT data) and version control log (VC log) becomes of paramount importance, in order to improve the quality of bug data in software repositories. In this way, researchers can do good quality research for software project benefit especially in open source software projects where information is limited in distributed development. Thus, shared data to track the issues of the project are not common. BT data often appears not to be mirrored when considering what developers logged as their actions, resulting in reduced traceability of defects in the development logs (VC logs). VC system (Version control system) data can be enhanced with data from bug tracking system (BT system), because VC logs reports about past software development activities. When these VC logs and BT data are used together, researchers can have a more complete picture of a bug’s life cycle, evolution and maintenance. However, current BT system and VC systems provide insufficient support for cross-analysis of both V Clogs and BT data for researchers in empirical software engineering research: prediction of software faults, software reliability, traceability, software quality, effort and cost estimation, bug prediction, and bug fixing. Aims and objectives: The aim of the thesis is to design and implement a tool chain to support the integration of a VC tool and a BT tool, as well as to synchronise the missing VC logs and BT data of open-source software projects automatically. The syncing process, using Bicho (BT tool) and CVSAnalY (VC tool), will be demonstrated and evaluated on a sample of 344 open source software (OSS) projects. Method: The tool chain was implemented and its performance evaluated semi-automatically. The SZZ algorithm approach was used to detect and trace BT data and VC logs. In its formulation, the algorithm looks for the terms "Bugs," or "Fixed" (case-insensitive) along with the ’#’ sign, that shows the ID of a bug in the VC system and BT system respectively. In i addition, the SZZ algorithm was dissected in its formulation and precision and recall analysed for the use of “fix”, “bug” or “# + digit” (e.g., #1234), was detected was detected when tracking possible bug IDs from the VC logs of the sample OSS projects. Results: The results of this analysis indicate that use of “# + digit” (e.g., #1234) is more precise for bug traceability than the use of the “bug” and “fix” keywords. Such keywords are indeed present in the VC logs, but they are less useful when trying to connect the development actions with the bug traces – that is, their recall is high. Overall, the results indicate that VC log and BT data retrieved and stored by automatic tools can be tracked and recovered with better accuracy using only a part of the SZZ algorithm. In addition, the results indicate 80-95% of all the missing BT data and VC logs for the 344 OSS projects has been synchronised into Bicho and CVSAnalY database respectively. Conclusion: The presented tool chain will eliminate and avoid repetitive activities in traceability tasks, as well as software maintenance and evolution. This thesis provides a solution towards the automation and traceability of BT data of software projects (in particular, OSS projects) using VC logs to complement and track missing bug data. Synchronising involves completing the missing data of bug repositories with the logs de tailing the actions of developers. Synchronising benefit various branches of empirical software engineering research: prediction of software faults, software reliability, traceability, software quality, effort and cost estimation, bug prediction ,and bug fixing.
2

Automatic novice program comprehension for semantic bug detection

Ade-Ibijola, Abejide Olu January 2016 (has links)
A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the Degree of Doctor of Philosophy in Computer Science April 2016 / Automatically comprehending novice programs with the aim of giving useful feedback has been an Artificial Intelligence problem for over four decades. Solving this problem basically entails manipulating the underlying program plans; i.e. extracting and comparing the novice's plan to the expert's plan and inferring where the novice's bug is from. The bugs of interest in this domain are often semantic bugs as all syntactic bugs are handled by automatic debuggers --- built in most compilers. Hence, a program that debugs like the human expert should understand the problem and know the expected solution(s) in order to detect semantic bugs. This work proposes a new approach to comprehending novice programs using: regular expressions for the recognition of plans in program text, principles from formal language theory for defining the space of program plan variations, and automata-based algorithms for the detection of semantic bugs. The new approach is tested with a repository of novice programs with known semantic bugs and specific bugs were detected. As a proof of concept, the theories presented in this work are further implemented in software prototypes. If the new idea is implemented in a robust software tool, it will find applications in comprehending first year students' programs, thereby supporting the human expert in teaching programming.
3

Biology and chemical control of the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), (Hemiptera: Miridae) in Quebec.

Khoury, Habib. January 1975 (has links)
No description available.
4

Field and laboratory studies on Leiophron pallipes Curtis and L. pseudopallipes Loan (Hymenoptera: Braconidae), parasitoids of the tarnished plant bug, Lygus lineolaris (P. de B.) (Hemiptera: Miridae) with emphasis on seasonal parasitism in two habitats.

Lim, Kiok-Puan January 1974 (has links)
No description available.
5

The nutrition and feeding behavior of the large milkweed bug, Oncopeltus fasciatus (Dallas)

Feir, Dorothy. January 1960 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1960. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
6

Plant (Asclepias) - insect (Oncopeltus) chemical relationship

Duffey, Sean Stephen January 1970 (has links)
The association of the Large Milkweed Bug, Oncopeltus fasciatus Dallas, with, a potentially poisonous Asclepiad, Asclepias, has been investigated to determine the fate of sequestered cardiac glycosides in this insect and to investigate the possibility that these compounds and/or odorous and volatile alkyl secretions of this insect may be serving as (an) anti-predator device(s). Nineteen species of Asclepias from diverse parts of North America have been shown to contain cardiac glycosides. Evidence is also given that Oncopeltus plus several other species of brightly coloured Coleopterans and Hemipterans, which are associated with Asclepias as a food-host, contain cardenolides which could function as the chemical basis for a Mullerian mimicry complex. The large quantities of polar cardiac glycosides sequestered by Oncopeltus fasciatus (approximately 111 micrograms) from the seeds of Asclepias syriaca were found to be concentrated in a complex of dorso-lateral abdominal and thoracic secretory glands. Various parameters of the uptake and entry of the natural cardiac glycosides of Asclepias syriaca and unnatural isotopic cardiac glycosides into the dorso-lateral glands were examined. The high levels of polar glycosides in Oncopeltus is also related to other aspects of the insect's physiology and the cardenolide composition of the food-host. The literature cites that lipid cardenolides are more emetic to birds than are the polar glycosides: therefore, the high levels of polar glycosides in this Hemipteran feeding on the above plant could make it non-emetic. Oncopeltus fasciatus was shown to be aposematic to chickens, turtles, lizards and starlings because of the volatile secretions of the ventral metathoracic glands. Frogs and toads did not consider this insect to be aposematic. The cardiac glycosides that had been sequestered from the seeds of this northern Asclepiad by Oncopeltus were not shown to be effective in causing rejection by the above predators in laboratory conditions. The predation studies on Oncopeltus suggest that the responses of various predators to a complex of glycoside containing mimics are not equivalent. This study also shows that along with predator responses being a critical feature in a palatability spectrum, the insect's physiology and its behavioural association with the plant are poignant aspects of the insect's potential to be unpalatable. / Science, Faculty of / Zoology, Department of / Graduate
7

Best Management Strategies to Manage the Tarnished Plant Bug (Heteroptera: Miridae) in Cotton

Graham, Scott Hester 07 May 2016 (has links)
Experiments were conducted to determine the impact of combining multiple best management practices to manage the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), on cotton. The implementation of this program reduced the amount of insecticide applications needed, significantly increased both square retention during the three weeks of squaring, and yield in the Delta region. Another study was conducted to explore behavioral responses of tarnished plant bug nymphs to several classes of insecticides. There appeared to be both avoidance and attraction depending on insecticide class. The presence of an insecticide did not affect the fruiting structure tarnished plant bugs were found on in the field, there were significantly more tarnished plant bugs found in the middle of the plant than the top or bottom at 3 DAT. At 7 DAT there were significantly more tarnished plant bugs found on the top of the plant followed by the middle then bottom.
8

Evaluation of Kudzu Bug as a Pest in Mississippi Soybean Production Systems

McRight, William Michael 04 May 2018 (has links)
The kudzu bug is an invasive species to the United States, and it has recently become a problem in the southern U.S. Experiments were conducted to examine the potential damage to vegetative stage soybean, with findings suggesting that kudzu bugs pose little threat to vegetative stage soybean in Mississippi soybean production systems. Foliar insecticides are an effective option for management of kudzu bug, however, neonicotinoid seed treatments are not recommended as an effective management strategy. Kudzu bug population densities of nymphs peaked in early August in soybean, and adult densities peaked in late September. This project was designed to develop a better understanding of the damage potential that kudzu bugs can cause as well as the best control methods available.
9

Biology and chemical control of the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), (Hemiptera: Miridae) in Quebec.

Khoury, Habib. January 1975 (has links)
No description available.
10

Field and laboratory studies on Leiophron pallipes Curtis and L. pseudopallipes Loan (Hymenoptera: Braconidae), parasitoids of the tarnished plant bug, Lygus lineolaris (P. de B.) (Hemiptera: Miridae) with emphasis on seasonal parasitism in two habitats.

Lim, Kiok-Puan January 1974 (has links)
No description available.

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