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IEEE GLOBECOM 2008 - 2008 IEEE Global telecommunications Conference

作者： Hui Yu Jing Chen Jianping Wang S. Q. Zheng Computer Engineering Program University of Texas Dallas Richardson TX USA Telecommunications Engineering Program University of Texas Dallas Richardson TX USA Department of Computer Science City University of Hong Kong Hong Kong China Department of Computer Science University of Texas Dallas Richardson TX USA

Search engine is a critical component in several stages of a pipeline flow in high-performance IP routers. To achieve high performance, it has been proposed to use TCAMs to implement search engines in hardware. In this paper, the state- of-art TCAM-based MSMB-LPT scheme is used as an example to show how to introduce pipelining into TCAM-based search by presenting pipelined scheme P-MSMB-LPT. It is shown that P-MSMB-LPT eliminates the unnecessary hazard that exists in the MSMB-LPT scheme, and achieves near-optimal speedup with almost no additional hardware overhead.

关键词： Search engines Pipeline processing Routing Hazards Security Throughput computer science Hardware Telecommunication computing Delay

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High-performance TCAM-based IP lookup engines

High-performance TCAM-based IP lookup engines

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IEEE Conference on computer Communications Workshops, INFOCOM Wksps

作者： Hui Yu Jing Chen Jianping Wang S.Q. Zheng Computer Engineering Program University of Texas Dallas Richardson TX USA Telecommunications Engineering Program University of Texas Dallas Richardson TX USA Department of Computer Science City University of Hong Kong Hong Kong China Computer Engineering Program University of Texas at Dallas Richardson 75083 USA

IP lookup is a key packet processing task in IP routers. To achieve high performance, it has been proposed to use TCAMs to implement IP-lookup accelerators. In this paper, in addition to the state-of-art MSMB-LPT scheme for TCAM-based IP lookup, M-MSMB-LPT and MSMB-LPT-I schemes are proposed and studied. Using realistic Internet packet traces, it is shown that MSMB-LPT, M-MSMB-LPT and MSMB-LPT-I schemes with different parameters constitute a solution space for constructing a wide-range of high-performance TCAM-based IP lookup engines. Under cost, performance and scalability constraints best IP lookup engine can be selected from this solution space.

关键词： Search engines Internet Routing Costs Associative memory computer science Hardware Random access memory Energy consumption Telecommunication computing

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An improved TCAM-based IP lookup engine

An improved TCAM-based IP lookup engine

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IEEE Workshop on High Performance Switching and Routing

作者： Hui Yu Jing Chen Jianping Wang S. Q. Zheng Mehrdad Nourani Computer Engineering Program University of Texas Dallas Richardson TX USA Telecommunications Engineering Program University of Texas Dallas Richardson TX USA Department of Computer Science City University of Hong Kong Hong Kong China Department of Computer Science University of Texas Dallas Richardson TX USA Department of Electrical Engineering University of Texas Dallas Richardson TX USA

IP lookup is a key task in packet processing to guarantee the high performance of the IP routers. It has been proposed to use TCAMs to implement IP-lookup accelerators for IP forwarding. In the paper, a new TCAM-based IP-lookup scheme MSMB-LPT is proposed and studied. It is shown that MSMB-LPT scheme significantly improve the performance of the state-of-art MSMB-PT scheme in terms of speedup and power consumption by simulations. These performance improvements are achieved with reduced cost.

关键词： Energy consumption Costs Routing Design engineering computer science Internet Traffic control Search engines Telecommunication computing Throughput

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OPTWALL: A Hierarchical Traffic-Aware Firewall 14

OPTWALL: A Hierarchical Traffic-Aware Firewall

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14th Symposium on Network and Distributed System Security, NDSS 2007

作者： Acharya, Subrata Abliz, Mehmud Mills, Bryan Znati, Taieb F. Wang, Jia Ge, Zihui Greenberg, Albert Department of Computer Science University of Pittsburgh PittsburghPA15260 United States Telecommunications Program University of Pittsburgh PittsburghPA15260 United States AT&T Labs Research Florham ParkNJ07932 United States

The overall efficiency, reliability, and availability of a firewall is crucial in enforcing and administrating security, especially when the network is under attack. The continuous growth of the Internet, coupled with the increasing sophistication of the attacks, is placing stringent demands on firewall performance. These challenges require new designs, architecture and algorithms to optimize firewalls. In this paper, we propose OPTWALL, an adaptive hierarchical firewall optimization framework aimed at reducing operational cost of firewalls. The main features of the proposed approach are the hierarchical design, splitting techniques, an online traffic adaptation mechanism, and a strong reactive scheme to counter malicious attacks (e.g. Denial-of-Service (DoS) attacks). To the best of our knowledge, this work is the first of its kind to use traffic characteristics in the design of an adaptive hierarchical firewall optimization framework. To study the performance of OPTWALL, a set of experiments are conducted on Linux ipchains. The performance evaluation study uses a large set of firewall policies and traffic traces managed by a Tier-1 ISP and provides security access for the ISP network from/to its business partners. Results show the high potential of OPTWALL to reduce the operational cost of firewalls. In particular, the results show that a performance improvement of nearly 35% can been achieved in a heavily loaded network environment. © 2007Proceedings of the Symposium on Network and Distributed System Security, NDSS 2007. All Rights Reserved.

关键词： Denial-of-service attack

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Fast time-domain edge-diffraction calculations for interactive acoustic simulations

Eurasip Journal on Advances in Signal Processing

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Eurasip Journal on Advances in Signal Processing 2007年 2007卷

作者： Calamia, Paul T. Svensson, U. Peter Program in Architectural Acoustics School of Architecture Rensselaer Polytechnic Institute Troy NY 12180 United States Department of Computer Science Princeton University Princeton NJ 08544 United States Acoustics Research Centre Department of Electronics and Telecommunications Norwegian University of Science and Technology NO-7491 Trondheim Norway

The inclusion of edge diffraction has long been recognized as an improvement to geometrical-acoustics (GA)modeling techniques, particularly for acoustic simulations of complex environments that are represented as collections of finite-sized planar surfaces. One particular benefit of combining edge diffraction with GA components is that the resulting total sound field is continuous when an acoustic source or receiver crosses a specular-zone or shadow-zone boundary, despite the discontinuity experienced by the associated GA *** interactive acoustic simulations which include only GA components, such discontinuities may be heard as clicks or other undesirable audible artifacts, and thus diffraction calculations are important for high perceptual quality as well as physical realism. While exact diffraction calculations are difficult to compute at interactive rates, approximate calculations are possible and sufficient for situations in which the ultimate goal is a perceptually plausible simulation rather than a numerically exact one. In this paper, we describe an edge-subdivision strategy that allows for fast time-domain edge-diffraction calculations with relatively low error when compared with results from a more numerically accurate solution. The tradeoff between computation time and accuracy can be controlled with a number of parameters, allowing the user to choose the speed that is necessary and the error that is tolerable for a specific modeling scenario.

关键词： Edge detection

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Traffic-aware firewall optimization strategies

Traffic-aware firewall optimization strategies

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2006 IEEE International Conference on Communications, ICC 2006

作者： Acharya, Subrata Wang, Jia Ge, Zihui Znati, Taieb F. Greenberg, Albert Department of Computer Science University of Pittsburgh Pittsburgh PA 15260 United States Telecommunications Program University of Pittsburgh Pittsburgh PA 15260 United States AT and T Labs Research Florham Park NJ 07932 United States

ISBN: (纸本)1424403553

The overall performance of a firewall is crucial in enforcing and administrating security, especially when the network is under attack. The continuous growth of the Internet, coupled with the increasing sophistication of the attacks, is placing stringent demands on firewall performance. In this paper, we describe a traffic-aware optimization framework to improve the operational cost of firewalls. Based on this framework, we design a set of tools that inspect and analyze both multidimensional firewall rules and traffic logs and construct the optimal equivalent firewall rules based on the observed traffic characteristics. To the best of our knowledge, this work is the first to use traffic characteristics in firewall optimization. Furthermore, we develop a novel adaptation mechanism that dynamically detects anomalous traffic behavior and adaptively alters the firewall rules to avoid serious performance degradation due to the traffic anomaly. To evaluate the performance of our approaches, we collected a large set of firewall rules and traffic logs at tens of enterprise networks managed by a Tier-1 service provider. Our evaluation results find these approaches very effective. In particular, we achieve more than 10 fold performance improvement by using the proposed traffic-aware firewall optimization. © 2006 IEEE.

关键词： computer system firewalls

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Data Storage Media Sanitization Procedures at the U.S. Agency For International Development (USAID)

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EDPACS 2006年第8期29卷 11-19页

作者： James Craft William Cleveland The Information Systems Security Officer at the United States Agency for International Development (USAID) Bureau for Management Information Resources Management (M/IRM) Information Systems Security Team. He has a BS in business management from George Mason University and has 22 years of experience focusing primarily on systems engineering cybersecurity and enterprise operations. He has played a major role in the implementation of the U.S. Government's Model Information Security Policy. The USAID PRIME Security Program Manager Computer Sciences Corporation in Arlington Virginia. He has MS degrees in information and telecommunications systems management and in military science. Cleveland has over 20 years of experience in the planning and management of a wide variety of functions including business process reengineering and IT security.

This article is derived from a Best Security Practice (BSP) developed by the U.S. Agency for International Development (USAID), Bureau for Management, Information Resources Management (M/IRM), Information Systems Security Team. The USAID is an independent agency that provides economic, development, and humanitarian assistance around the world in support of the foreign policy goals of the United States. It is located in the Ronald Reagan Building in Washington, D.C.

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STCP: a generic transport layer protocol for wireless sensor networks

STCP: a generic transport layer protocol for wireless sensor...

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International Conference on computer Communications and Networks (ICCCN)

作者： Y.G. Iyer S. Gandham S. Venkatesan Telecommunications Engineering Program University of Technology Dallas USA Department of Computer Science University of Technology Dallas USA

We consider the issue of designing a generic transport layer protocol for energy-constrained sensor networks. We present the requirements for such a transport protocol and propose sensor transmission control protocol (STCP). STCP is a generic, scalable and reliable transport layer protocol where a majority of the functionalities are implemented at the base station. STCP offers controlled variable reliability, congestion detection and avoidance, and supports multiple applications in the same network. We present the design and implementation of STCP and evaluate the protocol with different scenarios and network characteristics.

关键词： Transport protocols Wireless application protocol Wireless sensor networks Base stations Sensor phenomena and characterization Temperature sensors computer networks computer science Media Access Protocol Delay

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Journal of Information science and Engineering: Editorial notice

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Journal of Information science and Engineering 2005年第5期21卷 i-ii页

作者： Lee, Der-Tsai Amato, Nancy M. Chang, Shih-Fu Chen, Homer H. Chen, Tsuhan Hsu, Tsan-Sheng Hwang, Jenq-Neng Kuo, Sy-Yen Kuo, Tei-Wei Li, Chung-Sheng Tokuyama, Takeshi Wing, Jeannette Wu, Tzong-Chen Yen, John Computer Science at Texas A and M University United States Parasol Laboratory United States IEEE Transactions on Parallel and Distributed Systems Computing Research Association's Committee on the Status of Women in Computing Research CRA-W's Distributed Mentor Program United States Department of Electrical Engineering Columbia University United States Lab. United States College of Electrical Engineering and Computer Science National Taiwan University Taiwan IEEE Transactions on Circuits and Systems for Video Technology IEEE Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States ACM ACM SIGACT IEEE Computer Society IICM Austria Research and Development of the Department Multimedia Signal Processing Technical Committee IEEE Signal Processing Society United States IEEE Transactions on Circuits and systems for Video Technology College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan IEEE Technical Committee on Real-Time Systems Computer Science Division IBM T.J. Watson Research Center United States IBM Research Division Graduate School of Information Sciences Tohoku University Japan ACM IPSJ Mathematical Society of Japan Japan Department of Computer Science Computer Science Department Carnegie Mellon University United States National Academies of Science's Computer Science and Telecommunications Board United States Microsoft's Trustworthy Academic Advisory Board Intel Research Pittsburgh's Advisory Board United States Dartmouth's Institute for Security Technology Studies Advisory Committee Canada Sloan Research Fellowships Program Committee United States ACM Taiwan China Information Sciences and Technology Pennsylvania State University United States Laboratory for Intelligent Agents Penn State's School of Info

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Information technology mediated education - Revolution not evolution

Information technology mediated education - Revolution not e...

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34th Annual Frontiers in Education: Expanding Educational Opportunities Through Partnerships and Distance Learning - Conference Proceedings, FIE

作者： Lookabaugh, Tom Sicker, Douglas C. Computer Science Department Interdisciplinary Telecommunications Program University of Colorado Boulder CO 80309-0530

Information technology, and in particular distance education technology, is becoming more prevalent across society and throughout higher education. But as information technology mediated education moves from trials towards educating non-trivial numbers of students, we can expect established universities to resist wholesale adoption;particularly when it threatens core perceptions of what students want and need and the culture and financial model of the institution. The resulting increasing tension creates the potential for sudden and dramatic shifts rather than gradual adoption. Applications and practices that can signal the maturation of information technology mediated education include course importation and remote laboratory experiences. For institutions, successful development of information technology mediated education may require autonomous units. For individuals, the decision revolves around whether to participate and, if so, in what manner, particularly given academic culture and the potential for institutional resistance. © 2004 IEEE.

关键词： Engineering education

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