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An authorization model for multimedia digital libraries

International Journal on Digital Libraries 2004年第3期4卷 139-155页

作者： Kodali, Naren Farkas, Csilla Wijesekera, Duminda Department of Information and Software Engineering George Mason University Fairfax VA 22030-4444 United States Center for Secure Information Systems George Mason University Fairfax VA 22030-4444 United States Information Security Laboratory University of South Carolina Columbia SC 29208 United States Department of Computer Science and Engineering University of South Carolina Columbia SC 29208 United States

In this paper we present a generalized authorization model for multimedia digital libraries. Our aim is to support the enforcement of access control requirements of the original data sources without the need to create a new, unified model for the digital library. We integrate the three most widely used access control models (i.e., mandatory, discretionary, and role-based) within a single framework, allowing seamless accesses to data protected by these security models. In particular, we address the access control needs of continuous media data while supporting quality of service (QoS) requirements and preserving operational semantics. The technical core of the paper focuses on the development of metadata and the corresponding metastructure to represent authorization policies and QoS requirements and shows their applicabilty to continuous media. We define our security objects based on the Synchronized Multimedia Integration Language (SMIL), which controls multimedia presentations. Following the synchronization constructs 〈par〉 and 〈seq〉 of SMIL, we define a normal form for multimedia streams, called SMIL normal form. SMIL normal form provides a syntax-independent representation of semantically equivalent multimedia data. SMIL normal form compositions are extended (decorated) with RDF statements, representing security and QoS metadata. Interpretation of these statements and, therefore, the authorization and QoS requirements of the decorated multimedia object are defined by the metastructure, represented as a DAML+OIL ontology. We propose the concept of generalized subject that encompasses all access permissions of a given user regardless of the multiple permissions in different access control models. Finally, we develop methods to generate secure views for each generalized subject and retrieve them using a secure multimedia server. © Springer-Verlag 2004.

关键词： Access control Continuous media Digital library Metadata Semantics

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A software for voltage sags strategic studies

A software for voltage sags strategic studies

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2004 11th International Conference on Harmonics and quality of Power

作者： Carvalho Filho, José Maria Abreu, José Policarpo Gonçalves Clé Oliveira, Thiago Carpinteiro, Otávio Augusto Salgado Rosa Jr., Carlos Bernardes Oliveira, Fábio Auguste Gomes, Rogério Prina Carvalho, Sylvia G. Do Nascimento Gonçalves, David Power Quality Study Group Institute of Electrical Systems and Energy Itajubá Federal University P.O. Box 50 37500-000 Itajubá-MG Brazil Research Group on Computer Networks and Software Engineering Itajubá Federal Univeristy Brazil Light Serviços de Eletricidade S.A. Rio de Janeiro Brazil

This paper describes a software specially developed for strategic studies within Power quality, more specifically Voltage Sags. First, the methodology to estimate the number and the characteristics of the disturbances... 详细信息

ISBN: (纸本)0780387465

关键词： Electric potential

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Modular monadic program slicing

Modular monadic program slicing

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IEEE Annual International computer software and Applications Conference (COMPSAC)

作者： Yingzhou Zhang Baowen Xu Liang Shi Bixin Li Hongji Yang Department of Computer Science and Engineering South-East University Nanjing China Jiangsu Institute of Software Quality Nanjing China State Key Laboratory of Software Engineering Wuhan University of China Wuhan China School of computing De Montfort University UK

ISBN: (纸本)0769522092

Program slicing is widely used in applications such as program comprehension, software testing, debugging, measurement, and reengineering. This paper proposes a new approach for program slicing, called modular monadic slicing, basing on modular monadic semantics of the program analysed. We abstract the computation of program slicing as a language-independence entity: slice monad transformer. On the basis of this, we present and illustrate modular monadic dynamic and static slice algorithms in detail. We conclude that modular monadic slicing has excellent flexibility and reusability properties comparing with the existing program slicing algorithms. It computes program slices on abstract syntax directly without intermediate structures such as dependence graphs

关键词： Application software computer science software testing Debugging software measurement software quality Laboratories software engineering computer science education Educational programs

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A framework for Web applications testing

A framework for Web applications testing

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International Conference on Cyberworlds

作者： Lei Xu Baowen Xu Department of Computer Science & Engineering Jiangsu Institute of Software Quality South-East University Nanjing China State Key Laboratory of Software Engineering Wuhan University of China Wuhan China School of Computers National University of Defense Technology Changsha China

ISBN: (纸本)0769521401

Web application testing is concerned with numerous and complicated testing objects, methods and processes. So a testing framework fitting for the properties of Web application is needed to guide and organize all the testing tasks. Based on the analysis for Web application characters and traditional software testing process, the process for Web application testing is modeled, which describes a series of testing flows such as the testing requirement analysis, test cases generation and selection, testing execution, and testing results analysis and measurement. Furthermore, the realization techniques are also investigated so as to integrate each testing step and implement the whole testing process harmoniously and effectively. Thus the framework is suitable for the Internet environment and can guide the Web application testing actively and availably.

关键词： Testing

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Approximate caches for packet classification

Approximate caches for packet classification

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： F. Chang Wu-chang Feng Kang Li Systems Software Laboratory OGI School of Science and Engineering at OHSU Beaverton OR USA Department of Computer Science University of Georgia Athens GA USA

Many network devices such as routers and firewalls employ caches to take advantage of temporal locality of packet headers in order to speed up packet processing decisions. Traditionally, cache designs trade off time and space with the goal of balancing the overall cost and performance of the device. We examine another axis of the design space that has not been previously considered: accuracy. In particular, we quantify the benefits of relaxing the accuracy of the cache on the cost and performance of packet classification caches. Our cache design is based on the popular Bloom filter data structure. This paper provides a model for optimizing Bloom filters for this purpose, as well as extensions to the data structure to support graceful aging, bounded misclassification rates, and multiple binary predicates. Given this, we show that such caches can provide nearly an order of magnitude cost savings at the expense of misclassifying one billionth of packets for IPv6-based caches.

关键词： Filters Costs Aging Data structures Cache storage System software Laboratories Modems Protocols Classification algorithms

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Image attachment using fuzzy-genetic algorithms

Image attachment using fuzzy-genetic algorithms

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： B. Resko P. Korondi Z. Petres J.F. Bourges H. Hashimoto Japanese-Hungarian Laboratory Budapest University슠of슠Technology슠and슠Economics Hungary Computer Science and Software Engineering Department Laval University Sainte Foy QUE Canada Institute of Industrial Sciences Integrated Intelligent Systems Japanese-Hungarian Laboratory University of Tokyo Tokyo Japan

This paper gives contribution to the construction of an image mosaic by pasting together a sequence of photographs taken by a regular digital camera from the same position but in different directions. In order to find the best match between two overlapping images, a fuzzy-genetic based algorithm is presented. A translation vector with a minimal difference between the common picture parts has to be found. The difference is defined using the fuzzyfied contours of each images. The search of the optimal translation is considered as a minimization process. This paper proposes a method that uses genetic algorithms to find the minimum point corresponding to the optimal translation. Using the fuzzy based comparison of the two images yields a fast fitness function, while the implementation of the proposed method in a genetic hardware has a low and variable computational cost. The precision of the method is inverse-proportional with the computational time, which makes it ideal to be used in real time systems.

关键词： Cameras Genetic algorithms Intelligent systems Laboratories Real time systems Pixel computer industry Industrial economics Informatics software engineering

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Towards automated support for deriving test data from UML statecharts

Towards automated support for deriving test data from UML st...

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6th International Conference on Unified Modeling Language, UML 2003

作者： Briand, Lionel C. Cui, Jim Labiche, Yvan Software Quality Engineering Laboratory Systems and Computer Engineering Department Carleton University 1125 Colonel By Drive OttawaONK1S5B6 Canada

ISBN: (纸本)9783540202431

Many statechart-based testing strategies result in specifying a set of paths to be executed through a (flattened) statechart. These techniques can usually be easily automated so that the tester does not have to go through the tedious procedure of deriving paths manually to comply with a coverage criterion. The next step is then to take each test path individually and derive test data, i.e., fully specified test cases. This requires that we determine the system state required for each event/transition that is part of the path to be tested and the input parameter values for all events and actions on the transitions. We propose here a methodology to automate this procedure, which is based on a careful normalization and analysis of event/action contracts and transition guards written with the Object Constraint Language (OCL). It is illustrated by a case study that exemplifies the steps and provides an initial validation. Though many of the steps are automated, some inputs are still required from the modeler and tester and further work is necessary to push the automation even further and solve a number of remaining issues. This paper is a first attempt at clarifying the issues and identifying the analysis steps required in such an endeavor. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Automation

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A Context—Aware Infrastructure for Supporting Applications with Pen—Based Interaction

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Journal of computer Science & Technology 2003年第3期18卷 343-353页

作者：栗阳关志伟戴国忠任向实韩勇 Human-Computer Interaction Laboratory Institute of Software The Chinese Academy of Sciences Beijing 100080 P.R. China Department of Information Systems Engineering Kochi University of Technology Tosayamada-cho Kochi 782-8502 Japan

Pen-based user interfaces which leverage the affordances of the pen provide userswith more flexibility and natural interaction. However, it is difficult to construct usable pen-baseduser interfaces because of the lack of support for their development. Toolkit-level support has beenexploited to solve this problem, but this approach makes it hard to gain platform independence,easy maintenance and easy extension. In this paper a context-aware infrastructure is created,called WEAVER, to provide pen interaction services for both novel pen-based applications andlegacy GUI-based applications. WEAVER aims to support the pen as another standard interactivedevice along with the keyboard and mouse and present a high-level access interface to pen *** employs application context to tailor its service to different applications. By modeling theapplication context and registering the relevant action adapters, WEAVER can offer services,such as gesture recognition, continuous handwriting and other fundamental ink manipulations, toappropriate applications. One of the distinct features of WEAVER is that off-the-shelf GUI-basedsoftware packages can be easily enhanced with pen interaction without modifying the existing *** this paper, the architecture and components of WEAVER are described. In addition, examplesand feedbacks of its use are presented.

关键词： user interface pen-based interaction context-aware infrastructure ink gesture

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On the cost-quality tradeoff in topology-aware overlay path probing 11

On the cost-quality tradeoff in topology-aware overlay path ...

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11th IEEE International Conference on Network Protocols, ICNP 2003

作者： Tang, Chiping McKinley, P.K. Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East LansingMI48824 United States

ISBN: (纸本)0769520243

Path probing is essential to maintaining an efficient overlay network topology. However, the cost of a full-scale probing is as high as O(n2), which is prohibitive in large-scale overlay networks. Several methods have been proposed to reduce probing overhead, although at a cost in terms of probing completeness. In this paper, an orthogonal solution is proposed that trades probing overhead for estimation accuracy in sparse networks such as the Internet. The proposed solution uses network-level path composition information (for example, as provided by a topology server) to infer path quality without full-scale probing. The inference metrics include latency, loss rate and available bandwidth. This approach is used to design several probing algorithms, which are evaluated through analysis and simulation. The results show that the proposed method can significantly reduce probing overhead while providing hounded quality estimations for all n × (n - 1) overlay paths. The solution is well suited to medium-scale overlay networks in the Internet. In other environments, it can be combined with extant probing algorithms to further improve performance. © 2003 IEEE.

关键词： Bandwidth

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Towards the reverse engineering of UML sequence diagrams

Towards the reverse engineering of UML sequence diagrams

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Working Conference on Reverse engineering

作者： L.C. Briand Y. Labiche Y. Miao Software Quality Engineering Laboratory Systems and Computer Engineering Carleton University Ottawa ONT Canada

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