检索结果-内蒙古大学图书馆

A regular-irregular mixed meshing method for solidification simulation of castings

International Journal of Cast Metals Research 2003年第4期15卷 399-404页

作者： T.M. Wang I. Ohnaka J.D. Zhu F. Kinoshita T. Murakami The Materials Process Technology Center (Sokeizai Center) Cooperative Research Center for Advanced Science and Technology Osaka University Japan Department of Adaptive Machine Systems Graduate School of Engineering Osaka University Japan Multi-Flow Software Co. Ltd. Vancouver BC Canada. Komatsu soft Japan Komatsu soft Japan

A Regular-Irregular Mixed meshing method has been developed for the solidification simulation of castings. In this method, the mold and cavity are enmeshed with regular and irregular elements, and the irregular elements are only used for curved or inclined casting/mold boundary, resulting in better shape modeling than the regular meshing method. Furthermore the cost of calculation and storage in the mixed meshing method is low as compared with those in the irregular meshing method because the regular elements are used inside of the boundary. The discrete governing equations for the regular and irregular elements have been derived with the Direct Finite Difference Method (DFDM). Where, the implicit difference format was adopt6ed to avoid the small time step problem of irregular elements, and the implicit matrix equation was solved by using Incomplete Cholesky Conjugate Gradient (ICCG) method. Simulation results of temperature have been compared with those of other methods using iso-parametric elements, showing that the proposed method is a promising one.

关键词： Solidification simulation Regular-irregular mixed-meshing method Direct Finite Difference Method (DFDM) Incomplete Cholesky Conjugate Gradient (ICCG)

来源：评论

学校读者我要写书评

暂无评论

Energy absorption properties of FRP tube under commission load

Energy absorption properties of FRP tube under commission lo...

引用

作者： Yokoyama, Atsushi Nakatani, Tamotsu Tateishi, Motoharu Gotoh, Akihiko Division of Advanced Fibro-Science Graduate School Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto 606-8585 Japan Crash Safety Japan Automobile Research Institute 2530 Karima Tsukuba Ibaraki 305-0822 Japan MSC.Software Co. 5-2-39 Akasaka Minato-ku Tokyo 107-0052 Japan Department of Information Systems Engineering Osaka Sangyo University 3-1-1 Nakagaito Daito Osaka 574-8530 Japan

Tapered FRP tubes have high-energy absorption performance under axial compressive load. FRP will be useful for structural material of a shock absorber in the various industries. And in order to simulate the behavior of this material, several experimental tests and numerical simulations using FEM have been carried out recently. However, it is still difficult to simulate the behavior of tapered FRP tubes involving so called "Progressive Crushing" with FEM properly, because the fracture mechanism contains various kinds of fractures such as delamination, fiber fracture and so on. In this study, we proposed a specially designed FEM model based that is useful for the crush-worthiness analysis of FRP tube. Copyright © 2003 SAE International.

关键词： Shock absorbers

来源：评论

学校读者我要写书评

暂无评论

AGENT-ORIENTED METASYNTHETIC engineering FOR DECISION MAKING

引用

International Journal of Information technology & Decision Making 2003年第2期2卷 197-215页

作者： L. B. CAO R. W. DAI Department of Software Engineering Faculty of Information Technology University of Technology Sydney PO Box 123 Broadway NSW 2007 Australia Complex Systems and Intelligence Science Lab Institute of Automation Chinese Academy of Sciences P. O. Box 2728 Beijing 100080 China

Decision making plays a more and more important role in present society, especially in dealing with open complex giant systems, such as macroeconomic decision making. A feasible and effective approach for dealing with the increasingly remarkable decision making problems, in particular open complex giant systems, is to construct a Hall for Workshop of Metasynthetic engineering (HWME), which is essentially an open giant intelligent decision support system in itself. On the other hand, the emergent agent technology is proposed and popularized as a new computing paradigm for building complex software systems. In this paper, we first briefly introduce the principle of metasynthetic engineering and the HWME in terms of decision support, and propose the network-based hierarchical model of an HWME. Furthermore, we discusse the design idea of agent-oriented metasynthetic engineering for decision support systems. We discuss the design scheme, the framework and the working mechanism of an HWME based on intelligent agents in Java which took the macroeconomic decision making as an instance. In addition, we further examine the fundamental problem of designing agent-oriented open giant intelligent decision support systems. The suitability and challenges of the present agent-oriented abstractions for open giant intelligent systems are further analyzed. Then, we propose the concept of societal abstraction for agent-oriented open giant intelligent systems, which is based on the following hypothesis: a unified mechanism — societal interactions, organizational schemes and component patterns, and multi-agent society. Our preliminary study reveals that the agent-oriented metasynthetic engineering is valid and powerful for decision making of open complex giant systems.

关键词： Metasynthetic engineering decision making open complex giant system open giant intelligent system human computer cooperation HWME multi-agent technology

来源：评论

学校读者我要写书评

暂无评论

Evaluating the quality of information models: Empirical testing of a conceptual model quality framework

Evaluating the quality of information models: Empirical test...

引用

25th International Conference on software engineering

作者： Moody, Daniel L. Sindre, Guttorm Brasethvik, Terje Sølvberg, Arne Department of Software Engineering Charles University Praque Czech Republic School of Business Systems Monash University Melbourne Vic. Australia Dept. of Computer and Info. Science Norwegian Univ. Sci. and Technology Trondheim Norway Dept. of Mgmt. Sci. and Info. Syst. University of Auckland Auckland New Zealand

This paper conducts an empirical analysis of a semiotics-based quality framework for quality assuring information models. 192 participants were trained in the concepts of the quality framework, and used it to evaluate models represented in an extended Entity Relationship (ER) language. A randomised, double-blind design was used, in which each participant independently reviewed multiple models and each model was evaluated by multiple reviewers. A combination of quantitative and qualitative analysis techniques were used to evaluate the results, including reliability analysis, validity analysis, interaction analysis, influence analysis, defect pattern analysis and task accuracy analysis. An analysis was also conducted of the framework's likelihood of adoption in practice. The study provides strong support for the validity of the framework and suggests that it is likely to be adopted in practice, but raises questions about its reliability and the ability of participants to use it to accurately identify defects. The research findings provide clear directions for improvement of the framework. The research methodology used provides a general approach to empirical validation of quality frameworks.

关键词： software engineering

来源：评论

学校读者我要写书评

暂无评论

Empirical research methods in software engineering

Lecture Notes in Computer Science (including subseries Lectu...

引用

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2765卷 7-23页

作者： Wohlin, Claes Höst, Martin Henningsson, Kennet Dept. of Software Engineering and Computer Science Blekinge Institute of Technology Box 520 SE-372 25 Ronneby Sweden Dept. of Communication Systems Lund University Box 118 SE-221 00 Lund Sweden

software engineering is not only about technical solutions. It is to a large extent also concerned with organizational issues, project management and human behaviour. For a discipline like software engineering, empirical methods are crucial, since they allow for incorporating human behaviour into the research approach taken. Empirical methods are common practice in many other disciplines. This chapter provides a motivation for the use of empirical methods in software engineering research. The main motivation is that it is needed from an engineering perspective to allow for informed and well-grounded decision. The chapter continues with a brief introduction to four research methods: controlled experiments, case studies, surveys and post-mortem analyses. These methods are then put into an improvement context. The four methods are presented with the objective to introduce the reader to the methods to a level that it is possible to select the most suitable method at a specific instance. The methods have in common that they all are concerned with quantitative data. However, several of them are also suitable for qualitative data. Finally, it is concluded that the methods are not competing. On the contrary, the different research methods can preferably be used together to obtain more sources of information that hopefully lead to more informed engineering decisions in software engineering. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Motivation

来源：评论

学校读者我要写书评

暂无评论

Experimentation with usage-based reading

Lecture Notes in Computer Science (including subseries Lectu...

引用

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2765卷 193-207页

作者： Thelin, Thomas Erlansson, Magnus Höst, Martin Wohlin, Claes Dept. of Communication Systems Lund University Box 118 SE-221 00 Lund Sweden Dept. of Software Engineering and Computer Science Blekinge Institute of Technology Box 520 SE-372 25 Ronneby Sweden

software inspections are regarded as an important technique to detect faults throughout the software development process. The individual preparation phase of software inspections has enlarged its focus from only comprehension to also include fault searching. Hence, reading techniques to support the reviewers on fault detection are needed. Usage-based reading (UBR) is a reading technique, which focuses on the important parts from a user's point of view in a software document by using prioritized use cases. UBR has been evaluated in two previously conducted experiments, which investigate the prioritization of UBR and compare UBR against checklist-based reading (CBR). This chapter presents two controlled experiments with UBR on requirements and design specifications. The experiments include individual preparation and inspection meeting, i.e. the first steps of the traditional inspection process. For the requirements inspection, UBR is evaluated against CBR, and for the design inspection, the amount of information needed in the use cases are studied. The studies were conducted in different environments with a total of about 100 students. The result from these experiments shows that UBR is not better than CBR for requirements inspections. Results from the experiment on design inspection indicate that use cases developed in advance are preferable compared to developing them as part of the preparation phase of the inspection. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Inspection

来源：评论

学校读者我要写书评

暂无评论

Dynamic bit-rate reduction based on frame-skipping and requantization for MPEG-1 to MPEG-4 transcoder

Dynamic bit-rate reduction based on frame-skipping and requa...

引用

IEEE International Symposium on Circuits and systems (ISCAS)

作者： Kwang-deok Seo Soon-kak Kwon Sug Ky Hong Jae-kyoon Kim CDMA Handsets Division LG Electronics Inc. KOREA Dept. of Software Engineering Dongeui Univ. KOREA Dept. of EECS Korea Advanced Institute of Science and Technology (KAIST) KOREA

ISBN: (纸本)0780377613

In this paper, we propose a dynamic bit-rate reduction scheme for transcoding an MPEG-1 bitstream into an MPEG-4 simple profile bitstream. For dynamic bit-rate reduction, a significant reduction in the bit-rate is achieved by combining the processes of frame-skipping and requantization. For bit-rate reduction by frame-skipping, an efficient method is proposed for estimating the relevant motion vectors from the skipped frames. The conventional FDVS (forward dominant vector selection) method is improved to reflect the effect of the macroblock types in the skipped frames. For bit-rate reduction by requantization, an efficient requantization method is used for an MPEG-1 to MPEG-4 transcoder, consisting of R-Q (rate-quantization) modeling with a simple feedback and an adjustment of the quantization parameters to compensate for the different coding efficiency between MPEG-1 and MPEG-4. Simulation results demonstrated that the proposed method combining frame-skipping and requantization can generate a transcoded MPEG-4 bitstream that is much closer to the desired low bit-rate than the conventional method along with a superior visual quality.

关键词： MPEG 4 Standard Transcoding Quantization Discrete cosine transforms Quadratic programming Switches Telephone sets software engineering Motion estimation Feedback

来源：评论

学校读者我要写书评

暂无评论

Evaluation of fault handling of the time-triggered architecture with bus and star topology

Evaluation of fault handling of the time-triggered architect...

引用

International Conference on Dependable systems and Networks (DSN)

作者： A. Ademaj H. Sivencrona G. Bauer J. Torin Real-Time Systems Group University of Technology Vienna Vienna Austria Department of Electronics and Software SP Swedish National Testing and Research Institute Boras Sweden Department of Computer Engineering Chalmers University of Technology and Göteborg University Gothenburg Sweden

来源：评论

学校读者我要写书评

暂无评论

XML and the semantic web: What is the future?

Proceedings of the 36th Annual Hawaii International Conferen...

引用

Proceedings of the 36th Annual Hawaii International Conference on System Sciences, HICSS 2003 2003年 123-124页

作者： Chen, P. Bryan, George Vouk, Mladen Potok, Thomas E. Elmore, Mark Department of Computer Science Louisiana State University United States Centre for Advanced Systems Engineering University of Western Sydney Australia Department of Computer Science North Carolina State University United States Applied Software Engineering Research Group Oak Ridge National Laboratory United States

来源：评论

学校读者我要写书评

暂无评论

Evaluating the quality of information models: empirical testing of a conceptual model quality framework

Evaluating the quality of information models: empirical test...

引用

International Conference on software engineering (ICSE)

作者： D.L. Moody G. Sindre T. Brasethvik A. Solvberg School of Business Systems Monash University Melbourne Australia Department of Software Engineering Charles University Prague Czech Republic Department of Computer and Information Science Norwegian University of Science and Technology Trondheim Norway Department of Management Science and Information Systems University of Auckland New Zealand

This paper conducts an empirical analysis of a semiotics-based quality framework for quality assuring information models. 192 participants were trained in the concepts of the quality framework, and used it to evaluate models represented in an extended Entity Relationship (ER) language. A randomised, double-blind design was used, in which each participant independently reviewed multiple models and each model was evaluated by multiple reviewers. A combination of quantitative and qualitative analysis techniques were used to evaluate the results, including reliability analysis, validity analysis, interaction analysis, influence analysis, defect pattern analysis and task accuracy analysis.. An analysis was also conducted of the framework's likelihood of adoption in practice. The study provides strong support for the validity of the framework and suggests that it is likely to be adopted in practice, but raises questions about its reliability and the ability of participants to use it to accurately identify defects. The research findings provide clear directions for improvement of the framework. The research methodology used provides a general approach to empirical validation of quality frameworks.

关键词： Testing

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：