检索结果-内蒙古大学图书馆

International Workshop on Research Issues in Data engineering

作者： H.A. Kuno E.A. Rundensteiner Department of Electrical Engineering and Computer Science Software Systems Research Laboratory University of Michigan Ann Arbor MI USA

Object-oriented view mechanisms have received much attention in the literature in recent years, since they provide powerful mechanisms for addressing tasks such as customized tool interfacing to object-oriented databases (OODBs) and interoperability of heterogeneous databases. However, little progress has been made thus far on addressing the topic of view materialization in object-oriented databases. In the context of the MultiView project, we have developed an object model and an accompanying set of algorithms for the support of updatable materialized views in OODBs. We take advantage of unique features of the MultiView model, including its support for object-preserving queries, the integration of base and virtual classes into a unified and consistent global class hierarchy, and an object-slicing approach. In this paper, we present the MultiView model of materialized views, supporting updates on both base and virtual classes. We also describe a set of efficient algorithms for incremental view maintenance.< >

关键词： Object oriented modeling Object oriented databases computer science software systems Spatial databases Context modeling NASA Prototypes

来源：评论

学校读者我要写书评

暂无评论

A transparent object-oriented schema change approach using view evolution

A transparent object-oriented schema change approach using v...

引用

International Conference on Data engineering

作者： Young-Gook Ra E.A. Rundensteiner Department of Electrical Engineering and Computer Science Software Systems Research Laboratory University of Michigan Ann Arbor MI USA

When a database is shared by many users, updates to the database schema are almost always prohibited because there is a risk of making existing application programs obsolete when they run against the modified schema. This paper addresses the problem by integrating schema evolution with view facilities. When new requirements necessitate schema updates for a particular user, the user specifies schema changes to the personal view rather than to the shared base schema. Our view evolution approach then computes a new view schema that reflects the semantics of the desired schema change, and replaces the old view with the new one. We present algorithms that implement the set of schema evolution operations typically supported by OODB systems as view definitions. This approach provides the means for schema change without affecting other views (and thus without affecting existing application programs). The persistent data is shared by different views of the schema, i.e., both old as well as newly developed applications can continue to interoperate. In this paper, we present examples that demonstrate our approach.< >

关键词： Object oriented databases Multimedia databases computer science software systems Electronic mail Application software Data models computer aided manufacturing CADCAM Multimedia systems

来源：评论

学校读者我要写书评

暂无评论

Representing architectural designs: a central issue in the development of complex systems

Representing architectural designs: a central issue in the d...

引用

IEEE International Conference on engineering of Complex computer Systems

作者： V. Kirova W. Rossak Software Engineering Laboratory & Real-Time Computing Laboratory Department of Computer and Information Science New Jersey Institute of Technology Newark NJ USA

This paper discusses the need for and the use of a software architecture as an important means in the development of complex systems. We start out with a brief analysis of the term "complex" with regard to computerized systems. On this basis, we introduce software architectures as a means to cope with the software design aspect of system complexity. We then identify the architectural concepts that are necessary to capture a comprehensive, high level system design and discuss their characterizing properties. Finally, we propose a "construction-oriented" technique for architecture specification which is based on a generic set of architectural elements and is supported by a tool, d-ASPECT (domain Architecture Specification Tool), currently under development at NJIT.

关键词： Buildings Laboratories Control systems computer architecture software engineering Real time systems Information science Paper technology software architecture Law

来源：评论

学校读者我要写书评

暂无评论

PARALLEL AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

引用

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

来源：评论

学校读者我要写书评

暂无评论

Support for the file system security requirements of computational e-mail systems 94

Support for the file system security requirements of computa...

引用

Proceedings of the 2nd ACM Conference on computer and Communications Security

作者： Jaeger, Trent Prakash, Atul Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI

ISBN: (纸本)9780897917322

Computational e-mail systems, which allow mail messages to contain command scripts that automatically execute upon receipt, can be used as a basis for building a variety of collaborative applications. However, their use also presents a serious security problem because a command script from a sender may access/modify receiver's private files or execute applications on receiver's behalf. Existing solutions to the problem either severely restrict I/O capability of scripts, limiting the range of applications that can be supported over computational e-mail, or permit all I/O to scripts, potentially compromising the security of the receiver's files. Our model, called the intersection model of security, permits I/O for e-mail from trusted senders but without compromising the security of private files. We describe two implementations of our security model: an interpreter-level implementation and an operating systems-level implementation. We discuss the tradeoffs between the two implementations and suggest directions for future work.

关键词： file systems security computer-supported cooperative work active email groupware collaboration technology computational email

来源：评论

学校读者我要写书评

暂无评论

DistView: Support for building efficient collaborative applications using replicated objects 94

DistView: Support for building efficient collaborative appli...

引用

1994 ACM Conference on computer Supported Cooperative Work, CSCW 1994

作者： Prakash, Atul Shim, Hyong Sop Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109-2122 United States

ISBN: (纸本)0897916891

The ability to share synchronized views of interactions with an application is critical to supporting synchronous collaboration. This paper suggests a simple synchronous collaboration paradigm in which the sharing of the views of user/application interactions occurs at the window level within a multi-user, multi-window application. The paradigm is incorporated in a toolkit, DistView, that allows some of the application windows to be shared at a fine-level of granularity, while still allowing other application windows to be private. The toolkit is intended for supporting synchronous collaboration over wide-area networks. To keep bandwidth requirements and interactive response time low in such networks, DistView uses an object-level replication scheme, in which the application and interface objects that need to be shared among users are replicated. We discuss the design of DistVlew and present our preliminary experience with a prototype version of the system. © 1994 ACM.

关键词： Groupware

来源：评论

学校读者我要写书评

暂无评论

Case-DELIVERER: Making cases relevant to the task at hand 1st

引用

1st European Workshop on Case-Based Reasoning, EWCBR 1993

作者： Nakakoji, Kumiyo Department of Computer Science and Institute of Cognitive Science University of Colorado Campus Box 430 BoulderCO80309-0430 United States Software Engineering Laboratory Software Research Associates Inc. Tokyo Japan

ISBN: (纸本)9783540583301

Designers are limited in exploiting a catalog knowledge base of design cases because they may be unable to articulate what they are looking for, or may be unaware that potentially useful catalog examples exist. KiD (Knowing-In-Design), a domain-oriented, knowledge-based design environment for kitchen floor plan design, integrates the use of the catalog-base with its design tools. The information given through KIDSPECIFICATION (for specifying a design requirement) and KIDCONSTRUCnON (for graphically constructing a floor plan) provides representations of the designers' task at hand, and recorded design rationale in its argumentation-base is used to infer the relevance of catalog examples to the task at hand. The CASE-DELIVERER component orders catalog examples according to the partial specification, and the CATALOGEXPLORER subsystem allows designers to explore further the catalog space in terms of the task at hand. The study and assessment of the mechanisms have revealed that delivered cases helped designers reframe both a problem and a solution, and have encouraged designers to articulate a new portion of design knowledge, which addresses the knowledge acquisition problem. © Springer-Verlag Berlin Heidelberg 1994.

关键词： Floors

来源：评论

学校读者我要写书评

暂无评论

A Bayesian corner detector

A Bayesian corner detector

引用

The 1994 1st IEEE International Conference on Image Processing

作者： Zhang, Xining Haralick, R.M. Ramesh, V. Bedekar, A.S. Phillips, I. Intelligent Systems Laboratory Department of Electrical Engineering FT-10 University of Washington SeattleWA98195 United States Department of Computer Science and Software Engineering Seattle University SeattleWA98122 United States

A corner is modelled as the intersection of two lines. A corner point is that point on an input digital arc whose a posteriori probability of being a corner is the maximum among all the points on the arc. The performance of the corner detector is characterized by its false alarm rate, misdetection rate, and the corner location error all as a function of the noise variance, the included corner angle, and the arc length. Theoretical expressions for the quantities compare well with experimental results. © 1994 IEEE.

关键词： Edge detection

来源：评论

学校读者我要写书评

暂无评论

Types, classes and collections in object-oriented analysis

Types, classes and collections in object-oriented analysis

引用

IEEE International Conference on Requirements engineering

作者： G. Eckert Software Engineering Laboratory-Department of Computer Science EPFL-DI-LGL Swiss Federal Institute of Technology Lausanne Switzerland

The author evaluates the classification support provided by current object-oriented analysis methods and proposes possible improvements. Concepts of object-orientation are briefly reviewed. Key principles for classification are identified and emerging object-oriented analysis methods are then judged against these principles. In an attempt to avoid some of the identified shortcomings, it is proposed that classification support during analysis should be based on two distinct constructs (types and collections) instead of a single class construct. This suggestion is based on a clear distinction between the essential and the contingent properties of the modelled objects.< >

关键词： Object oriented modeling software engineering Laboratories computer science Taxonomy Proposals computer languages Encapsulation Prototypes

来源：评论

学校读者我要写书评

暂无评论

A Bayesian corner detector

A Bayesian corner detector

引用

IEEE International Conference on Image Processing

作者： Xining Zhang R.M. Haralick V. Ramesh A.S. Bedekar I. Phillips Intelligent Systems Laboratory Department of Electrical Engineering University of Washington Seattle WA USA Department of Computer Science And Software Engineering Seattle University Seattle WA USA

关键词： Bayesian methods Detectors Image segmentation Image edge detection Zirconium Intelligent systems Laboratories computer science software engineering Detection algorithms

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：