检索结果-内蒙古大学图书馆

International Conference on Computational Intelligence and Multimedia Applications

作者： J. Karlelar U.B. Desai Hughes Software Systems Limited Gurgaon India Department of Electrical Engineering Indian Institute of Technology Mumbai India

A novel hybrid compression scheme for videoconferencing and videotelephony applications at very low bit rates (i.e., 32 Kbits/s) is presented. The human face is the most important region within a frame and should be coded with high fidelity. To preserve perceptually important information at low bit rates, such as face regions, skin-tone is used to detect and adaptively quantize these regions. Novel features of this coder are the use of overlapping block motion compensation in combination with discrete wavelet transform, followed by zerotree entropy coding with new scanning procedure of wavelet blocks such that the rest of the H.263 framework can be used. At the same total bit-rate, coarser quantization of the background enables the face region to be quantized finely and coded with higher quality.

关键词： Video compression Teleconferencing

来源：评论

学校读者我要写书评

暂无评论

Using coupling measurement for impact analysis in object-oriented systems

Using coupling measurement for impact analysis in object-ori...

引用

International Conference on software Maintenance (ICSM)

作者： L.C. Briand J. Wust H. Lounis Fraunhofer Institute of Experimental Software Engineering (IESE) Kaiserslautern Germany Informatique de Montréal Centre de Recherche Montreal QUE Canada

Many coupling measures have been proposed in the context of object oriented (OO) systems. In addition, due to the numerous dependencies present in OO systems, several studies have highlighted the complexity of using dependency analysis to perform impact analysis. An alternative is to investigate the construction of probabilistic decision models based on coupling measurement to support impact analysis. In addition to providing an ordering of classes where ripple effects are more likely, such an approach is simple and can be automated. In our investigation, we perform a thorough analysis on a commercial C++ system where change data has been collected over several years. We identify the coupling dimensions that seem to be significantly related to ripple effects and use these dimensions to rank classes according to their probability of containing ripple effects. We then assess the expected effectiveness of such decision models.

关键词： Electrical capacitance tomography Collaboration Performance evaluation Performance analysis software engineering Encapsulation System testing History Fault diagnosis Identity management systems

来源：评论

学校读者我要写书评

暂无评论

Transitioning legacy assets to a product line architecture 7

引用

Proceedings of the 7th European software engineering conference held jointly with the 7th ACM SIGSOFT international symposium on Foundations of software engineering

作者： Joachim Bayer Jean-François Girard Martin Würthner Jean-Marc DeBaud Martin Apel Fraunhofer Institute for Experimental Software Engineering Kaiserslautern Germany Lucent PaceLine Technologies Naperville IL Tecmath GmbH & Co. KG Kaiserslautern Germany

ISBN: (纸本)9783540665380

A successful software system evolves over time, but this evolution often occurs in an ad-hoc fashion. One approach to structure system evolution is the concept of software product lines where a core architecture supports a variety of application contexts. However, in practice, the high cost and high risks of redevelopment as well as the substantial investments made to develop the existing systems most often mandate significant leverage of the legacy assets. Yet, there is little guidance in the literature on how to transition legacy assets into a product line *** this paper, we present RE-PLACE, an approach developed to support the transition of existing software assets towards a product line architecture while taking into account anticipated new system variants. We illustrate this approach with its application in an industrial setting.

关键词： reengineering domain-specific software architecture architecture recovery software product line reuse

来源：评论

学校读者我要写书评

暂无评论

Investigating quality factors in object-oriented designs: an industrial case study

Investigating quality factors in object-oriented designs: an...

引用

International Conference on software engineering (ICSE)

作者： L.C. Briand J. Wust S.V. Ikonomovski H. Lounis Fraunhofer Institute of Experimental Software Engineering (IESE) Kaiserslautern Germany Centre de Recherche informatique de Montreal Inc. Montreal QUE Canada

This paper aims at empirically exploring the relationships between most of the existing coupling and cohesion measures for object-oriented (OO) systems, and the fault-proneness of OO system classes. The underlying goal of such a study is to better understand the relationship between existing design measurement in OO systems and the quality of the software developed. The study described here is a replication of an analogous study conducted in an university environment with systems developed by students. In order to draw more general conclusions and to (dis)confirm the results obtained there, we now replicated the study using data collected on an industrial system developed by professionals. Results show that many of our findings are consistent across systems, despite the very disparate nature of the systems under study. Some of the strong dimensions captured by the measures in each data set are visible in both the university and industrial case study. For example, the frequency of method invocations appears to be the main driving factor of fault-proneness in all systems. However, there are also differences across studies which illustrate the fact that quality does not follow universal laws and that quality models must be developed locally, wherever needed.

关键词： Computer aided software engineering Computer industry Industrial relations Permission software engineering software measurement software quality Frequency Object oriented modeling Performance evaluation

来源：评论

学校读者我要写书评

暂无评论

Content based very low bit rate video coding using wavelet transform

Content based very low bit rate video coding using wavelet t...

引用

IEEE International Conference on Image Processing

作者： J. Karlekar U.B. Desai Electronic City Hughes Software Systems Limited Gurgaon India Department of Electrical Engineering Indian Institute of Technology Mumbai India

In this paper we present a new hybrid compression scheme for videoconferencing and videotelephony applications at very low bit rates (i.e., 32 kbits/s). In these applications, human face is the most important region within a frame and should be coded with high fidelity. To preserve perceptually important information at low bit rates, such as face regions, skin-tone is used to detect and adaptively quantize these regions. Novel features of this coder are the use of overlapping block motion compensation in combination with discrete wavelet transform, followed by zerotree entropy coding with new scanning procedure of wavelet blocks such that the rest of the H.263 framework can be used. At the same total bit-rate, coarser quantization of the background enables the face region to be quantized finely and coded with higher quality. The simulation results demonstrates comparable objective and superior subjective performance when compared with H.263 video coding standard, while providing the advanced feature like scalability functionalities.

关键词： Bit rate Video coding Face detection Discrete wavelet transforms Teleconferencing Humans Motion compensation Entropy coding Quantization Scalability

来源：评论

学校读者我要写书评

暂无评论

An assessment and comparison of common software cost estimation modeling techniques 99

An assessment and comparison of common software cost estimat...

引用

Proceedings of the 21st international conference on software engineering

作者： Lionel C. Briand Khaled El Emam Dagmar Surmann Isabella Wieczorek Katrina D. Maxwell Fraunhofer Institute for Experimental Software Engineering IESE Sauerwiesen 6 67661 Kaiserslautern Germany DATAMAX 14 Ave. F-Roosevelt 77210 Avon France

来源：评论

学校读者我要写书评

暂无评论

3 CMMI and systems engineering

引用

INCOSE International Symposium 1999年第1期9卷 523-531页

作者： Clouse, Aaron Schoening, William W. Graffius, Joseph Wells, Curt Raytheon Systems Company Germany The Boeing Company United States Honeywell Inc United States Software Engineering Institute United States

In late 1999 the systems engineering community will be presented with a new process maturity model produced by the Capability Maturity Model Integration (CMMI) project. The immediate significance to systems engineers is that the new model offers, for the first time, strong integration and consistency with the software CMM (SW-CMM v2). Organizations can choose to use one or more of several highly integrated models – a systems engineering CMM, a software CMM and a systems + software CMM. Organizations can further choose to use a continuous or a staged version of each model and be assured of equivalent content. This paper describes the relationship of the new CMMI models to the recently completed EIA/IS 731, systems engineering Capability Model, and the potential impacts to systems engineering process appraisal and improvement. An overview of the CMMI models and terminology is provided as a basis for describing the relation to the EIA/IS 731. © 1999 The Authors.

关键词： Professional aspects

来源：评论

学校读者我要写书评

暂无评论

Multi-domain surety modeling and analysis for high assurance systems

Multi-domain surety modeling and analysis for high assurance...

引用

International Conference and Workshop on engineering of Computer-Based systems

作者： J. Davis J. Scott J. Sztipanovits M. Martinez Institute for Software Integrated Systems Vanderbilt University Nashville TN USA Electromechanical Engineering Department Sandia National Laboratories Albuquerque NM USA

engineering systems are becoming increasingly complex as state of the art technologies are incorporated into designs. Surety modeling and analysis is an emerging science that permits an engineer to qualitatively and quantitatively predict and assess the completeness and predictability of a design. Surety is a term often used in the Department of Defense (DoD) and Department of Energy (DOE) communities, which refers to the integration of safety, security, reliability and performance aspects of design. Current risk assessment technologies for analyzing complex systems fail to adequately describe the problem, thus making assessment fragmented and non-integrated. To address this problem, we have developed a methodology and extensible software toolset to address model integration and complexity for high consequence systems. The MultiGraph Architecture (MGA) facilitates multi-domain, model-integrated modeling and analyses of complex, high-assurance systems. The MGA modeling environment allows the engineer to customize the modeling environment to match a design paradigm representative of the actual design. Previous modeling tools have a predefined model space that forces the modeler to work in less than optimal environments. Current approaches force the problem to be bounded and constrained by requirements of the modeling tool and not the actual design problem. In some small cases, this is only marginally adequate. The MGA facilitates the implementation of a surety methodology, which is used to represent high assurance systems with respect to safety and reliability. Formal mathematical models are used to correctly describe design safety and reliability functionality and behavior. The functional and behavioral representations of the design are then analyzed using commercial-off-the-shelf (COTS) tools.

关键词： Design engineering Safety systems engineering and theory Predictive models Reliability engineering Power engineering and energy US Department of Energy Security Risk management Failure analysis

来源：评论

学校读者我要写书评

暂无评论

Methods And Tools For Information systems Development Introduction To Minitrack

Methods And Tools For Information Systems Development Introd...

引用

Annual Hawaii International Conference on System Sciences (HICSS)

作者： A.R. Hevner R.C. Linger Department of Information Systems University of South Florida Tampa FL USA Software Engineering Institute Carnegie Mellon University Pittsburgh PA USA

Summary form only given. Introduces the articles in the minitrack series on information systems development.

关键词： Information systems Unified modeling language Enterprise resource planning Instruments Electrical capacitance tomography Coordinate measuring machines software tools Standards development Testing Programmable logic arrays

来源：评论

学校读者我要写书评

暂无评论

Wireless multicasting: design and performance analysis

Wireless multicasting: design and performance analysis

引用

IEEE International Conference on Personal Wireless Communication

作者： A. Mishra C.P. Ravikumar Electtonic City Hughes Software Systems Limited Gurgaon Haryana India Department of Electrical Engineering Indian Institute of Technology New Delhi India

Advances in the area of image and voice compression have given way to transmission rates of a few kilobits/second for acceptable quality audio and video. Audio/video conferencing among multiple parties in cellular networks is therefore a distinct possibility. We present an algorithm for designing a mobile cellular network that can support multicasting applications. The mobile network may consist of one or more tiers, which correspond to different user velocities. Communication channels are partitioned across tiers. The objective of network design is to minimize call loss probability by selecting an appropriate frequency reuse pattern and suitably partitioning network resources across tiers. Earlier work in this area has only concentrated on point-to-point communications. We permit multicast communications that may involve users from more than one tier. We describe a cost optimization algorithm for designing cellular networks that can support multicast traffic. We also describe a performance analysis of the designed network through analytical and simulation techniques.

关键词： Performance analysis Land mobile radio cellular systems Videoconference Video compression Multicast algorithms Partitioning algorithms Algorithm design and analysis Image coding Communication channels Frequency

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：