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A systematic approach to static access control 1

引用

10th European symposium on Programming

作者： Pottier, FN Skalka, C Smith, S Johns Hopkins Univ Baltimore MD 21218 USA INRIA Rocquencourt Le Chesnay France

ISBN: (数字)9783540453093

ISBN: (纸本)3540418628

the Java JDK 1.2 Security Architecture includes a dynamic mechanism for enforcing access control checks, so-called stack inspection. this paper studies type systems which can statically guarantee the success of these checks. We develop these systems using a new, systematic methodology: we show that the security-passing style translation, proposed by Wallach and Felten as a dynamic implementation technique, also gives rise to static security-aware type. systems, by composition with conventional type systems. To define the latter, we use the general HM(X) framework, and easily construct several constraint- and unification-based type systems. they offer significant improvements on a previous type system for JDK access control, both in terms of expressiveness and in terms of readability of inferred type specifications.

关键词： access control

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Middleware support for global access to integrated computational collaboratories

Middleware support for global access to integrated computati...

引用

International symposium on High Performance Distributed Computing

作者： V. Mann M. Parashar The Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA

the growth of the Internet and the advent of the computational "Grid" have made it possible to develop and deploy advanced computational collaboratories. these systems build on high-end computational resources and communication technologies underlying the Grid, and provide seamless and collaborative access to particular resources, services or applications. Integrating these "focused" collaboratories presents significant challenges. Key among these is the design and development of robust middleware support that addresses scalability, service discovery, security and access control, and interaction and collaboration management for consistent access. the authors first investigate the architecture of such a middleware that enables global (Web-based) access to collaboratories. they then present the design and implementation of a middleware substrate that enables a peer-to-peer integration of and global (collaborative) access to geographically distributed instances of the DISCOVER computational collaboratory for interaction and steering.

关键词： Middleware Grid computing International collaboration Peer to peer computing Internet Communications technology Robust control Scalability Communication system security access control

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A memory specific notation for fault modeling

A memory specific notation for fault modeling

引用

Asian Test symposium (ATS)

作者： Z. Al-Ars A.J. Van de Goor J. Braun D. Richter Aculty of Information Technology and Systems Section of Computer Engineering Delft University of Technnology Delft Netherlands Product Engineering Group 2 Infineon Technologies Munich Germany

ISBN: (纸本)0769513786

this paper shows the shortcomings of the current, generic notation for fault models and extends it to allow the description of fault models for DRAMs. the advantage is that the extended fault models can easily be translated into operation sequences and tests that detect the described fault. Examples are given to show that the new notation results in optimized, memory specific, tests that have a shorter run time for a given fault coverage.

关键词： Testing Random access memory Fault detection Stress Read-write memory SPICE Information technology Fault diagnosis Temperature sensors Voltage

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Middleware Support for Global access to Integrated Computational Collaboratories 01

Middleware Support for Global Access to Integrated Computati...

引用

Proceedings of the 10th IEEE International symposium on High Performance Distributed Computing

作者： Vijay Mann

Abstract: the growth of the Internet and the advent of the computational "Grid" have made it possible to develop and deploy advanced computational collaboratories . these systems build on high-end computational resources and communication technologies underlying the Grid, and provide seamless and collaborative access to particular resources, services or applications. Integrating these "focused" collaboratories presents significant challenges. Key among these is the design and development of robust middleware support that addresses scalability, service discovery, security and access control, and interaction and collaboration management for consistent access. In this paper we first investigate the architecture of such a middleware that enables global (web-based) access to collaboratories. We then present the design and implementation of a middleware substrate that enables a peer-to-peer integration of and global (collaborative) access to geographically distributed instances of the DISCOVER computational collaboratory for interaction and steering.

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UTRA TDD protocol operation

UTRA TDD protocol operation

引用

11th IEEE International symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2000)

作者： Gessner, C Köhn, R Schniedenharn, J Sitte, A Siemens AG D-13623 Berlin Germany

ISBN: (纸本)0780364635

Within the third Generation Partnership Project (3GPP) [1] which was founded to harmonise the third generation technologies by different standardisation authorities [2], the UMTS Terrestrial Radio access (UTRA) [3][4][5] was created to form a global standard. UTRA FDD is based on WCDMA [6][7][8], UTRA TDD [9][10][12][13] is based on TD-CDMA. Using the results of the physical layer harmonisation between both modes a set of specifications representing the Layer 2 and Layer 3 covering both TDD and FDD was created in 3GPP [3]. the Medium access control (MAC), the Radio Link control (RLC), the Broadcast/Multicast control (BMC) and the Packet Data Convergence Protocol (PDCP) belong to the Layer 2 of the UTRA Network, UTRAN. the Radio Resource control (RRC) represents the Layer 3 protocol which belongs to access Stratum. All these protocols are basically common for TDD and FDD. Based on an harmonised design FDD/TDD dual mode operation is facilitated, which provides a basis for the development of low cost terminals. Also, harmonisation of UTRA with GSM is ensured. the paper provides an overview of UTRA TDD operation in Layer 2 and Layer 3. It describes the protocol architecture, and shows some specific solutions for resource assignments during packet transmission in TDD.

关键词： Time division multiple access

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Link quality in SIR based power control for UMTS CDMA systems

Link quality in SIR based power control for UMTS CDMA system...

引用

11th IEEE International symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2000)

作者： Oppermann, I Latva-aho, M Kumpumaki, T Univ Oulu Dept Elect Engn CWC Oulu FIN-90571 Oulu Finland

ISBN: (纸本)0780364635

this paper examines the related issues of capacity, coverage and power control in a multi-cell WCDMA network. the network capacity in this case is based on required link quality thresholds. If all users achieve the required link SIR targets for a given percentage of all power control time slots, the network is deemed not to have exceeded its capacity. When this is 50%, the analysis reverts to the conventional mean SIR target performance. For network operators however a substantially higher link quality requirement is likely. In this case, 95% is considered. this means all users must achieve a SIR of greater than or equal to the target value for 95% of the time. the analysis is based on extended models used for IS-95 systems which relies on Gaussian assumptions of interference. this approach gives an insight into the effects of varying traffic types, different allowances for SIR targets and mixed traffic. this paper presents analysis which allows the mimum required power control to be determined based on network load and traffic mix. It also presents analysis which allows the impact of mobile by mobile power control to be examined.

关键词： Code division multiple access

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Effect of angle spread on system capacity in DS/CDMA cellular system using adaptive array antenna

Effect of angle spread on system capacity in DS/CDMA cellula...

引用

11th IEEE International symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2000)

作者： Watanabe, K Sampei, S Morinaga, N Osaka Univ Grad Sch Engn Suita Osaka 5650871 Japan

ISBN: (纸本)0780364635

this paper evaluates the effect of angle spread on system capacity for DS/CDMA system using;a delay profile measurement based adaptive array antenna combined with beam pattern selection diversity and carrier-to-interference plus noise (CINR) based transmit power control (TPC) techniques. In the proposed system, beam directivity is controlled by the delay profiles for each terminal measured in each antenna element. Moreover, to reduce the number of computation for the beam directivity control, the proposed system calculates the optimum beam directivity for only a limited number of terminals that locates far from the base station, and signals from the rest of the terminals are demodulated by selecting one of the most reliable adaptive array combined signals. this technique will be called beam pattern selection diversity. For the evaluation of impact of the angle spread of the multipath components on the capacity of DS/CDMA systems with the adaptive array antenna, computer simulation is conducted. the results show that the proposed scheme gives better performance than the sector antenna systems under practical angle spread conditions;i.e., less than 10 degree, with relatively a small number of computation.

关键词： Code division multiple access

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Neck range of motion and use of computer head controls 00

Neck range of motion and use of computer head controls

引用

4th International Conference on Assistive Technology (ASSETS 2000)

作者： LoPresti, E. Brienza, D.M. Angelo, J. Gilbertson, L. Sakai, J. Department of Bioengineering University of Pittsburgh 5040 Forbes Tower Pittsburgh PA 15260 United States

ISBN: (纸本)9781581133134

Computer head controls provide an alternative means of computer access for people with disabilities. However, a person's ability to use head controls may be reduced if his or her disability involves neck movement limitations. In this study, 15 subjects without disabilities and 10 subjects with disabilities received neck range of motion evaluations and performed computer exercises using head controls. Regression analysis was used to determine the relationship between neck range of motion and performance on computer exercises. Reduced neck range of motion was found to be correlated with reduced functional range for moving the cursor across the screen, and reduced accuracy and speed in icon selection. Fitts' Law-type models were fit to the data, indicating higher Fitts' law slopes for subjects with disabilities compared to subjects without disabilities. Results also indicate that vertical cursor movements are faster than horizontal or diagonal movements.

关键词： Computer control

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引用

13th International Parallel Processing symposium, IPPS 1999 Held in Conjunction with the 10th symposium on Parallel and Distributed Processing, SPDP 1999

作者： Lam, Kam-Yiu Kuo, Tei-Wei Law, Gary C. K. Tsang, Wai-Hung Department of Computer Science City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong Department of Computer Science and Information Engineering National Chung Cheng University Chiayi621 Taiwan

ISBN: (纸本)3540658319

Research in the concurrency control of real-time data access over mobile networks is receiving growing attention. With possibly lengthy transmission delay and frequent disconnection, traditional concurrency control mechanisms may become very costly and time-consuming in mobile distributed real-time database systems (MDRTDBS). Due to limited bandwidth and unpredictable behavior of mobile networks, the past research on concurrency control for distributed real-time database systems (DRTDBS) can not be directly applied to MDRTDBS. In this paper, we propose a distributed real-time locking protocol called SDHP-2PL, based on the High Priority Two Phase Locking (HP-2PL) scheme and the concept of similarity for MDRTDBS. We consider the characteristics of mobile networks and adopt the concept of similarity to reduce the possibility of lock conflicts. A detailed model of a MDRTDBS has been developed, and a series of simulation experiments have been conducted to evaluate the capability of SDHP-2PL and the effectiveness of using similarity for MDRTDBS. the simulation results have confirmed our belief that the use of similarity as the correctness criterion for concurrency control in MDRTDBS can significantly improve the system performance. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Concurrency control

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Orthogonal extensions to the WWW user interface using client-side technologies 97

Orthogonal extensions to the WWW user interface using client...

引用

Proceedings of the 1997 10th Annual symposium on User Interface Software and Technology, UIST

作者： Fox, Armando Gribble, Steven D. Chawathe, Yatin Polito, Anthony S. Huang, Andrew Ling, Benjamin Brewer, Eric A. Univ of California Berkeley Berkeley CA United States

ISBN: (纸本)9780897918817

the orthogonal extensions of the World Wide Web (WWW) user interface support user control of intelligent services. the extensions are orthogonal to provide an interface to a service, which compliments the Web browsing but is independent of the content of any particular site. the service keeps a separate `preferences profile' for each user to allow each user to vary the aggressiveness of lossy compression, selectively turn off the service for certain pages, and select the type of interface provided for refinement of degraded content. three technologies for implementing the WWW TranSend interface are described: Hypertext Markup Language (HTML) decoration, Java, and JavaScript.

关键词： Graphical user interfaces

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