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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

軟體專案度量與分析流程規劃~發展QMAP方法

林建妤, Lin, Chien Yu Unknown Date (has links)
為提升國內軟體專案生產力和品質,建立度量與分析的機制,本研究參考能力成熟度整合模式(Capability Maturity Model Integration, CMMI)之度量與分析流程領域作為指引,結合GQM (Goal-Question-Metric)及PSM (Practical Software & Systems Measurement)的度量方法論,發展一套提問式驅動度量與分析流程規劃法,稱為QMAP (Questions driven- Measurement & Analysis Process Planning)—運用5W1H (Why, Who, When, What, Where & How) 提問方式,有系統地依據CMMI度量與分析流程的要求,找出軟體專案的成功因素,逐步建立組織內部的度量與分析流程的基準。首先,以某公司之個案情境為例進行背景分析、目標分析和流程分析,接著以使用分析—使用案例及其描述之資訊需求,建議整合運用PSM Insight, MS Project及IBM Rational ClearQuest等工具來支援軟體專案度量與分析流程之自動化。經工具系統之實作展示,再以自我評鑑來檢視QMAP於CMMI度量與分析流程之目標及執行方法的符合程度,而部分未達成的項目則作為未來研究之方向。 / This research proposes a method called QMAP (Questions driven- Measurement and Analysis Process Planning) in order to meet goals and practices in Capability Maturity Model Integration (CMMI). QMAP is about 5W1H questions which begin with why, who, when, what, where and how. Before answering the 5W1H questions, we start with background analysis, goal analysis, and process analysis based on a sample company’s management context. Use Cases are then described as the formal information requirements of the MA process support system. In the implementation, we suggest to integrate some tools, such as MS Project, PSM Insight, and IBM Rational ClearQuest, to facilitate the measurement data collection and analysis activities during the software project development. After illustrating the implementation prototype, a checklist for self-appraisal is presented to identify the compliances of CMMI goals and practices, and the incomplete parts for future research extension.
2

Prediction of early age and time dependent deformations in a massive concrete structure

Aghili, Ali, Ribac, Haris January 2018 (has links)
The heat development that occurs due to the hydration of cement is important to consider during casting of massive concrete structures. By using computer programs that are based on finite element methods (FEM), simulations can be performed on the heat- and strength development. In this project, a FE program called ConTeSt has been used in order to predict the temperature- and strain development in a massive concrete wall. If the potential risks in a concrete structure are evaluated before casting, economical savings, including a better casting plan could be obtained. The structure under investigation was a concrete wall behind one of the spillways in the hydro power dam of Storfinnforsen. Due to a re-construction of the wall, an opportunity occurred to develop a measurement plan of the casting and perform simulations on the wall. A sensitivity analysis was performed in order to investigate the effects on the temperature- and strain development, by varying the cement content, ambient temperature, wind speed and degree of restraint in translation. The results showed, that a higher cement content increased the rate of hydration and hence the temperature in the concrete. Higher wind speeds contributed to more cooling of the concrete which, in some cases, resulted in cracking due to contraction of the material. Cracking due to contraction also occurred when the ambient temperature was decreased. The ambient temperature did not have a significant impact on the rate of hydration, but instead the impact was larger from the initial temperature of the fresh concrete. A higher initial temperature of the fresh concrete increased the rate of hydration, which increased the temperature in the material. The degree of restraint could only be varied in translation in ConTeSt and hence the effect on the strain development was not that significant. A crack risk analysis was performed where the developed tensile stresses were compared with the tensile strength of the concrete. The same factors were varied as in the sensitivity analysis. The results showed that the tensile strength was exceeded for most of the cases and thus that the crack risk was high. The required equipment, in order to perform the measurements on site, consisted of 7 strain gauges of the module KM-100B from TML Tokyo Sokki Kenkyujo, 2 data loggers of the module Spider-8 from HBM, at least a 25 m ø9 mm 5-core shielded cable and a computer with the software Catman Easy. / Värmeutvecklingen som uppstår på grund av hydratationen av cement är viktig att beakta vid gjutning av massiva betongkonstruktioner. Detta brukar göras genom simuleringar av värmeutvecklingen och hållfasthetstillväxten med hjälp av olika finita element (FE) program. I detta projekt har programmet ConTeSt använts för att på förhand kunna förutse temperatur - och töjningsutvecklingen i en massiv betongvägg. I och med detta kan bl.a. gjutningen planeras bättre samtidigt som ekonomiska besparingar kan åstadkommas om eventuella risker kan kartläggas innan gjutningen påbörjas. En ledmur bakom ett av utskoven i Storfinnforsens kraftverk undersöktes närmare i samband med en ombyggnad. Möjligheten uppstod att planera en mätning av gjutningen av ledmuren samt att utföra simuleringar av väggen i ConTeSt. En känslighetsanalys utfördes för att undersöka effekterna på temperatur- och töjningsutvecklingen genom att variera cementhalten, omgivningstemperaturen, vindhastigheten och graden av tvång i förskjutningen i längdriktningen av väggen. Resultaten visade att högre cementhalter ökade graden av hydratation vilket ökade temperaturen i betongen. Högre vindhastigheter bidrog till snabbare kylning av betongen vilket i vissa fall lett till sprickor på grund av kontraktion av materialet. Sprickor till följd av kontraktion uppstod även då omgivningstemperaturen sänktes. Omgivningstemperaturen hade ingen större påverkan på hydratationen, utan istället var det temperaturen av den färska betongmassan som visade större påverkan. Högre temperatur av den färska betongmassan ökade graden av hydratation vilket ökade temperaturen i betongen. Graden av tvång kunde i ConTeSt endast varieras i förskjutningen i längdriktningen av väggen vilket inte hade någon större effekt på töjningsutvecklingen. En sprickrisk analys utfördes där den utvecklade dragspänningen jämfördes med draghållfastheten. Analysen utfördes genom att variera samma faktorer som varierades i känslighetsanalysen. Resultaten visade att draghållfastheten överskreds i de flesta fall och att därmed sprickrisken var hög. För att genomföra mätningen blev slutsatsen att det behövs 7 st töjningsgivare av modell KM-100B från TML Tokyo Sokki Kenkyujo, 2 st data logger av typ Spider8 från HBM samt minst en 25 m ø9 mm skärmad 5-kärnkabel, inklusive en dator med programvaran Catman Easy.

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