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A p-cycle based survivable design for dynamic traffic in WDM networks

A p-cycle based survivable design for dynamic traffic in WDM...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Wensheng He Jing Fang A.K. Somani Dependable Computing & Networking Laboratory Department of Electrical & Computer Engineering Iowa State University Ames IA USA

Achieving both high capacity efficiency and fast restoration speed is a primary goal of survivable design in WDM network. The p-cycle method aims to benefit from the fast restoration of ring-like protection and high capacity efficiency of mesh protection. In this paper, we first present a p-cycle based method to deal with dynamic traffic in survivable WDM network design. In this method, we first find an optimal set of p-cycles for the given network topology. Next, we propose three routing strategies for accommodating dynamic requests upon their arrival time. The performance of our p-cycle based design using different routing strategies are compared with that of the shared backup path protection (SBPP). The results show that proposed p-cycle based design method performs better than SBPP in dense networks. Whereas SBPP performs better than the p-cycle based design in sparse networks.

关键词： Telecommunication traffic Intelligent networks WDM networks Protection Routing computer networks Network topology Helium Laboratories Design engineering

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Network selection using fuzzy logic

Network selection using fuzzy logic

引用

International Conference on Broadband Networks (BroadNets)

作者： S. Kher A.K. Somani R. Gupta Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

The peer-to-peer technology offers many advantages, but at the same time, it poses many novel challenges for the research community. Modern peer-to-peer systems are characterized by large scale, poor reliability, and extreme dynamism of the participating nodes, with a continuous flow of nodes joining and leaving the systems. Selection of an optimal network requires estimation of its rank using attributes such as storage, average load, cost, reliability etc. There are multiple networks, each vying for users business by providing them novel services. The user in turn has to decide which network best meets its service requirements and accordingly join a network. In this paper, we propose a model with two ranking schemes, one being network-specific and the other user-specific. The schemes use fuzzy logic to rank different networks based on their attributes. The difference between the two ranking schemes lie in the dynamism offered by them. The user-specific ranking criteria is flexible while the network-specific scheme uses a fixed criteria. The network-specific scheme helps in providing a structure to visualize the overall performance index of the networks. The user-specific scheme is adaptive in the sense that it caters to the specific needs of the users. The simulations performed by us show that the two schemes are light-weight, highly accurate and easily implementable

关键词： Fuzzy logic Peer to peer computing Grid computing computer networks Distributed computing Image storage Laboratories Large-scale systems computer network reliability Cost function

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Real-time H/W implementation of the approximate discrete Radon transform

Real-time H/W implementation of the approximate discrete Rad...

引用

International Conference on Application Specific Systems (ASAP), Architectures and Processors

作者： M.T. Frederick N.A. VanderHorn A.K. Somani Dependable Computing and Networking Laboratory Department of Electrical & Computer Engineering Iowa State University Ames IA USA

The Radon transform (RT) is a widely studied algorithm used to perform image pattern extraction in fields such as computer graphics, medical imagery, and avionics. Real time implementation of the discrete RT (DRT) is extremely difficult due to its use of complex trigonometric functions and O(N/sup 3/) time complexity, making its use in video applications difficult. A O(N/sup 2/lgN) approximate discrete (ADRT) has been presented in literature (Brady, 1998) that allows highly parallel computation. This paper presents an architecture that uses the ADRT to create a computation architecture known as the xADRT. Performance analysis indicates that it can achieve a refresh rate of 10 frames per second for use in real time image processing applications.

关键词： Discrete transforms Application software computer architecture Read-write memory computer networks computer graphics Biomedical imaging Concurrent computing Computational complexity Laboratories

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Game theory as a tool to strategize as well as predict nodes' behavior in peer-to-peer networks

Game theory as a tool to strategize as well as predict nodes...

引用

International Conference on Parallel and Distributed Systems (ICPADS)

作者： R. Gupta A.K. Somani Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

In this paper we use game theory to study nodes' behavior in peer-to-peer networks when nodes receive service based on their reputation. Reputation is used as a mechanism to incentivize nodes to share resources and provide services to others. The probability of a node obtaining service is directly proportional to its current reputation, and the only way to enhance reputation is by serving others. Thus, the problem of free-riding is minimized. Game theory can be used by individual selfish nodes to determine their optimal strategy for participation level in such a system. Moreover, game theory gives us interesting insight into the overall nature of nodes' interactions and system efficiency, and how system efficiency can be improved.

关键词： Peer to peer computing Game theory Intelligent networks computer networks Nash equilibrium Costs Laboratories Electronic mail Network servers Distributed computing

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IP traffic grooming over WDM optical networks

IP traffic grooming over WDM optical networks

引用

International Conference on Optical Network Design and Modeling, ONDM

作者： Jing Fang A.K. Somani Dependable Computing & Networking Laboratory Department of Electrical & Computer Engineering Iowa State University Ames IA USA

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CompuP2P: a light-weight architecture for Internet computing

CompuP2P: a light-weight architecture for Internet computing

引用

International Conference on Broadband Networks (BroadNets)

作者： V. Sekhri R. Gupta A.K. Somani Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

Internet computing is emerging as an important new paradigm in which resource intensive computing is integrated over Internet-scale networks. Over these large networks, different users and organizations share their computing resources, and computations take place in a distributed fashion. In such an environment, a framework is needed in which the resource providers are given incentives to share their resources. CompuP2P is a light weight architecture for enabling Internet computing. It uses peer-to-peer networks for sharing of computing resources. CompuP2P create dynamic markets of network accessible computing resources, such as processing power, memory storage, disk space, etc., in a completely distributed, scalable, and fault-tolerant manner. This paper discusses the system architecture, functionality, and applications of the proposed CompuP2P architecture. We have implemented a Java based prototype, and our results show that the system is light-weight and can provide almost a perfect speedup for applications that contain several independent compute-intensive tasks

关键词： computer architecture Internet computer networks Peer to peer computing Distributed computing IP networks Grid computing Fault tolerance Prototypes Java

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Intentional dropping: a novel scheme for SYN flooding mitigation

Intentional dropping: a novel scheme for SYN flooding mitiga...

引用

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

作者： B. Al-Duwairi G. Manimaran Dept. of Electrical and Computer Engineering Dependable Computing & Networking Laboratory Iowa State University Ames IA Dept. of Electrical and Computer Engineering Dependable Computing & Networking Laboratory Iowa State University Ames IA USA

This paper presents a novel scheme to mitigate the effect of SYN flooding attacks. The scheme, called intentional dropping based filtering, is based on the observation of client's persistence (i.e., client's reaction to packet loss by subsequent retransmissions) which is very widespread as it is built in TCP's connection setup. The main idea is to intentionally drop the first SYN packet of each connection request. Subsequent SYN packet from a request is passed only if it adheres to the TCP's timeout mechanism. Our analysis shows that the proposed scheme reduces attacker's effective attack rate significantly with an acceptable increase in connection establishment latency.

关键词： Floods Traffic control Web and internet services Bandwidth Access protocols computer crime TCPIP computer networks Filtering Delay

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Partitioned cache shadowing for deep sub-micron (DSM) regime

Partitioned cache shadowing for deep sub-micron (DSM) regime

引用

Pacific Rim International Symposium on dependable computing

作者： Heng Xu A. Somani Dependable Computing and Networking Laboratory Electrical and Computer Engineering Iowa State University Ames IA USA

An important issue in modern cache designs is bridging the gap between wire and device delays. This warrants the use of more regular and modular structures to mask wire latencies. This paper advances the basic concepts of shadow caching to offer protection against both data corruption and micro-network disruption in partitioned architectures. Network disruption is tolerated by sending shadow packet along a different route than the original packet, whereas the data corruption problem is addressed by reserving a small portion of the overall cache capacity for in-cache shadow space. Our results show that an average of 96% in data error coverage for Spec2K benchmarks can be achieved and more than 99% of the transient faults on the underlying switched micro-network can also be protected while incurring less than 3% performance degradation in most of the above benchmarks.

关键词： Shadow mapping Delay Protection Wire Fault tolerance Personal communication networks computer networks Degradation Error correction codes Laboratories

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Database caching in MANETs based on separation of queries and responses

Database caching in MANETs based on separation of queries an...

引用

IEEE International Conference on Wireless and Mobile computing, networking And Communications (WiMob)

作者： H. Artail H. Safa S. Pierre Electrical and Computer Engineering department American University of Beirut Beirut Lebanon Mobile Computing and Networking Research Laboratory (LARIM) Department of Computer Engineering Ecole Polytechnique de Montreal Montreal Canada Department of Computer Science American University of Beirut Beirut Lebanon

This paper proposes a model for caching database data in mobile ad-hoc networks through caching the queries and their responses. The approach makes a distinction between the queries and their responses and caches them on separate mobile nodes. This method is driven by the fact that queries do not become invalid unless when the design of the database entities changes while data changes depending on the application that feeds information into the database. The architecture we use is hierarchical and employs three types of designated nodes: a query directory (QD), service manager (SM), and caching node (CN). The one or more QDs are responsible for caching the queries and are assigned and supervised by the SM that also oversees the mobility activities and the availability of nodes in the network and makes "managerial" decisions accordingly, including appointing backup nodes. With this model, any node that joins the ad hoc network will either contribute services to other nodes (willingness to become an SM, a QD, or a CN) or consume services offered by other nodes. This model attempts to coordinate the query executing and query caching mechanisms in a seamless manner while maintaining minimal communication among nodes. We present preliminary results of a model that was simulated using the NS-2 software and show the viability of the proposed approach.

关键词： Databases Mobile ad hoc networks Ad hoc networks computer networks Mobile computing Samarium Electronic mail Mobile communication Routing Laboratories

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Adaptive approach for QoS support in IEEE 802.11e wireless LAN

Adaptive approach for QoS support in IEEE 802.11e wireless L...

引用

IEEE International Conference on Wireless and Mobile computing, networking And Communications (WiMob)

作者： J. Naoum-Sawaya B. Ghaddar S. Khawam H. Safa H. Artail Z. Dawy Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon Mobile Computing and Networking Research Laboratory (LARIM) Ecole Polytechnique de Montreal Montreal Canada Department of Computer Science American University of Beirut Beirut Lebanon

the IEEE 802.11e standard has been introduced recently for providing quality of service (QoS) capabilities in the emerging wireless local area networks. This standard introduces a contention window based enhanced distributed channel access (EDCA) technique that provides a prioritized traffic to guarantee the minimum bandwidth needed for time critical applications. However, the EDCA technique resets statically the contention window of the mobile station after each successful transmission. This static behavior does not adapt to the network state hence reduces the network usage and results in bad performance and poor link utilization whenever the demand for link utilization increases. This paper proposes a new adaptive differentiation technique for IEEE 802.11e wireless local area networks that takes into account the network state before resetting the contention window. The performance of the proposed technique is evaluated compared to the original differentiation techniques of the IEEE 802.11a and IEEE 802.11e standards. Preliminary results show that the proposed adaptive technique enhances the channel utilization and increases throughput.

关键词： Wireless LAN Quality of service Bandwidth Intelligent networks Telecommunication traffic Throughput Helium Local area networks IP networks Delay

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