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Performance evaluation of ad-hoc WLAN by M/G/1 queueing model

Performance evaluation of ad-hoc WLAN by M/G/1 queueing mode...

引用

international conference on information technology: coding and computing (itcc)

作者： Sheng-Tzong Cheng Mingzoo Wu Department of Computer Science and Information Engineering National Cheng Kung University Tainan County Taiwan

ISBN: (纸本)0769523153

The distributed coordination function (DCF) is specified for both ad-hoc and infrastructure network configurations in the IEEE 802.11 standard. In this paper, we present an analytic model for evaluating the performance at nodes in a DCF based ad-hoc network without the assumption of saturation condition made in previous works. We model each node as a discrete time M/G/1 queue and describe the distribution of the DCF virtual service time by means of probability generating function (PGF), and further, obtain the average packet queueing delay and response time. Three adjustable input parameters are the number of stations n, packet arrival rate /spl lambda/, and average payload length E[P]. The analytical results are validated through extensive simulations, and it is shown that the model has significant high accuracy.

关键词： Wireless LAN Performance analysis Ad hoc networks Analytical models Access protocols Throughput Telecommunication traffic Traffic control Delay effects Payloads

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Tracking of unusual events in wireless sensor networks based on artificial neural-networks algorithms

Tracking of unusual events in wireless sensor networks based...

引用

international conference on information technology: coding and computing (itcc)

作者： A. Kulakov D. Davcev Computer Science Department Faculty of Electrical Engineering Skopje Macedonia

Some of the algorithms developed within the artificial neural-networks tradition can be easily adopted to wireless sensor network platforms and will meet the requirements for sensor networks like: simple parallel distributed computation, distributed storage and data robustness. As a result of the dimensionality reduction obtained simply from the outputs of the neural-networks clustering algorithms, lower communication costs and energy savings can also be obtained. In this paper we will present two possible implementations of the ART and FuzzyART neural-networks algorithms, which are unsupervised learning methods for categorization of the sensory inputs. They are tested on a data obtained from a set of several motes, equipped with several sensors each. Results from simulations of purposefully faulty sensors show the data robustness of these architectures. The proposed neural-networks classifiers have distributed short and long-term memory of the sensory inputs and can function as security alert when unusual sensor inputs are detected.

关键词： Wireless sensor networks Clustering algorithms Robustness Computer networks Concurrent computing Distributed computing Costs Subspace constraints Unsupervised learning Testing

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Disciplined methods of software specification: a case study

Disciplined methods of software specification: a case study

引用

international conference on information technology: coding and computing (itcc)

作者： R.L. Baber D.L. Parnas S.A. Vilkomir P. Harrison T. O'Connor Software Quality Research Laboratory (SQRL) Department of Computer Science and Information Systems University of Limerick Ireland Dell Products Limerick Ireland

We describe our experience applying tabular mathematical approaches to software specifications. Our purpose is to show alternative approaches to writing tabular specifications and to help practitioners who want to apply such methods by allowing them to pick the best one for their problem. The object for the case study is software used by Dell Products for testing the functionality of the keyboards on notebook computers. Starting from informal documents, we developed a variety of tabular representations of finite state machine specifications and tabular trace specifications. We found that the discipline required by these methods raised issues that had never been considered and resulted in documents that were both more complete and much clearer. The various tabular representations are compared from a user's point of view, i.e., clarity, consistency, unambiguity, completeness, suitability, etc.

关键词： Computer aided software engineering Software testing Automata Software quality Keyboards Inspection Laboratories Computer science information systems Writing

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Replica placement in data grid: considering utility and risk

Replica placement in data grid: considering utility and risk

引用

international conference on information technology: coding and computing (itcc)

作者： R.M. Rahman K. Barker R. Alhajj Department of Computer Science University of Calgary Calgary AB Canada

Grid computing emerges from the need to integrate a collection of distributed computing resources to offer performance unattainable by any single machine. Grid technology facilitates data sharing across many organizations in different geographical locations. Data replication is an excellent technique to move and cache data close to users. Replication reduces access latency and bandwidth consumption. It also facilitates load balancing and improves reliability by creating multiple data copies. However, grid environments introduce significant new challenges such as dynamic resource availability and network performance changes. As users requests vary constantly, the system needs a dynamic replication strategy that adapts to users' dynamic behavior. To address such issues, this paper presents and evaluates the performance of six dynamic replication strategies for two different kinds of access patterns. Our replication strategies are mainly based on utility and risk. Before placing a replica at a site, we calculate an expected utility and risk index for each site by considering current network load and user requests. A replication site is then chosen by optimizing expected utility or risk indexes.

关键词： Grid computing Utility theory Distributed computing Bandwidth Computer science Drives Delay Load management Availability Resource management

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Applications of the Montgomery exponent

Applications of the Montgomery exponent

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international conference on information technology: coding and computing (itcc)

作者： S. Gueron O. Zuk Department of Mathematics University of Haifa Israel Department of Physics of Complex Systems Weizmann Institute of Science Israel

We define here the Montgomery exponent of order s, modulo the odd integer N, by MEXP = MEXP(A,X,N,s) = A/sup X/2/sup -s(X-1)/ (mod N), and illustrate some properties and usage of this operator. We show how A/sup X/ (mod N) can be obtained from MEXP(A, X, N, s) by one Montgomery multiplication. This suggests a new modular exponentiation algorithm that uses one Montgomery multiplication less than the number required with the standard method. This improves the performance, although the improvement is significant only when the exponent X is short (e.g., modular squaring or RSA verification). However, and even more important, this achieves code size reduction, which is appreciated when the exponentiation algorithm is written in a low-level language and stored in (expensive) ROM. We also illustrate the potential advantage in performance and code size when known cryptographic applications are modified in a way that MEXP replaces the standard modular exponentiation.

关键词： Public key cryptography Mathematics Physics Read only memory Code standards Arithmetic Hardware Costs Public key information technology

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An adaptive scalable multiuser-OFDM system for multimedia transmission over fading channels

An adaptive scalable multiuser-OFDM system for multimedia tr...

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international conference on information technology: coding and computing (itcc)

作者： A.M.M. Nadhim Jianhua He Jiangtao Xi Zongkai Yang Electronics and Information Engineering Department Huazhong University of Science and Technology Wuhan China School of Electrical Computer and Telecommunications Engineering University of Wollongong Wollongong Australia

In this paper, an adaptive scalable multiuser-OFDM system was proposed for multimedia transmission over fading channels. The proposed adaptive algorithm can adapt according to the channel status information of each user's channel status. This algorithm dynamically changes according to the user's channel changes; this can keep fixed QoS at the physical layer. Another predefined QoS for different sessions and services to be provided for different users. This QoS can be guaranteed by multimedia scalability. Scalability can adapt to the service requirements, in terms of transmission data rate and bandwidth. As a result, a robust multimedia transmission scheme is achieved by providing fix QoS for the end users in multiuser environment, by fixing QoS in the physical layer by the bit and power adaptation technique and also in service layer by scalability techniques. Furthermore, space diversity techniques are used to decrease the effect of frequency selective multipath effects in broadband wireless channels.

关键词： Adaptive systems Multimedia systems Fading Scalability Physical layer Adaptive algorithm Heuristic algorithms Bandwidth Robustness Frequency diversity

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Practical evaluation of a radial soft hash algorithm

Practical evaluation of a radial soft hash algorithm

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international conference on information technology: coding and computing (itcc)

作者： F.-X. Standaert E. Lefebvre G. Rouvroy B. Macq J.-J. Quisquater J.-D. Legat Crypto Group Univ. Catholique de Louvain Belgium Laboratoire de Télécommunications et Télédétection Université Catholique de Louvain Belgium Laboratoire de Microélectronique Université Catholique de Louvain Belgium

This paper presents a practical evaluation of a radial soft hash algorithm, an image hashing technique used for image and visual content authentication. First we evaluate its collision resistance and susceptibility to geometrical deformations and image processing attacks. Second we investigate its actual efficiency on different platforms. Although software implementations allow managing sizes and throughput for most applications, they suffer from some troubles for real time applications such as video and for images in high definition. For these more constrained contexts, we propose hardware implementations. In practice, throughput up to 2/sup 18/ (resp. 2/sup 26/) pixels/sec are managed in a single SW (resp. HW) implementation.

关键词： Cryptography Robustness Authentication Throughput Application software Content management Watermarking Digital signatures Image coding Videoconference

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Design theoretic approach to replicated declustering

Design theoretic approach to replicated declustering

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international conference on information technology: coding and computing (itcc)

作者： A.S. Tosun Department of Computer Science University of Technology San Antonio TX USA

Declustering techniques reduce query response times through parallel I/O by distributing data among multiple devices. Most of the research on declustering is targeted at spatial range queries and investigates schemes with low additive error. Recently, declustering using replication is proposed to reduce the additive overhead. Replication significantly reduces retrieval cost of arbitrary queries. In this paper, we propose a disk allocation and retrieval mechanism for arbitrary queries based on design theory. Using proposed c-copy replicated declustering scheme, (c - 1)k/sup 2/ + ck buckets can be retrieved using at most k disk accesses. Retrieval algorithm is very efficient and is asymptotically optimal with /spl Theta/(|Q|) complexity for a query Q. In addition to the deterministic worst-case bound and efficient retrieval, proposed algorithm handles nonuniform data, high dimensions, supports incremental declustering and has good fault-tolerance property.

关键词： information retrieval Costs Fault tolerance Spatial databases Computer science Delay Computer errors Visual databases information systems Data visualization

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Media access mechanisms for integrated services in wireless networks

Media access mechanisms for integrated services in wireless ...

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international conference on information technology: coding and computing (itcc)

作者： Sheng-Tzong Cheng Ming-Hung Tao Mingzoo Wu Department of Computer Science and Information Engineering National Cheng Kung University Tainan County Taiwan

ISBN: (纸本)0769523153

In the paper, we propose a media access framework for supporting integrated service including the real-time service, the controlled load service, and the best effort service in wireless networks. Three medium access mechanisms, the "Multi-classes fair scheduling", the "Single-class fair scheduling + DCF", and the "Single-class fair scheduling + DCF with threshold for controlled load service" are proposed in the paper to manage the traffic within a piconet. Moreover, a measurement based admission control algorithm is proposed to guarantee the QoS requirements for the requests. We compare the performance of the proposed access mechanisms by conducting simulations. The simulation results show that the "Multi-classes fair scheduling " mechanism is the best choice for the networks occupied by the real-time service; the "Single-class fair scheduling + DCF with threshold for controlled service" mechanism is the best for controlled service in general case.

关键词： Intserv networks Intelligent networks Wireless networks Communication system control Peer to peer computing Admission control Telecommunication traffic Communication system traffic control Personal area networks Access protocols

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Dynamic learning of automata from the call stack log for anomaly detection

Dynamic learning of automata from the call stack log for ano...

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international conference on information technology: coding and computing (itcc)

作者： Zhen Liu S.M. Bridges Department of Computer Science and Engineering Mississippi State University USA

Anomaly detection based on monitoring of sequences of system calls has proved to be an effective approach for detection of previously unknown attacks on programs. This paper describes a new model for profiling normal program behavior that can be used to detect intrusions that change application execution flow. The model (hybrid push down automaton, HPDA) incorporates call stack information and can be learned by dynamic analysis of training data captured from the call stack log. The learning algorithm uses call stack information maintained by the program to build a finite state automaton. When compared to other approaches including VtPath which also uses call stack information, the HPDA model produces a more compact and general representation of control flow, handles recursion naturally, can be learned with less training data, and has a lower false positive rate when used for anomaly detection. In addition, dynamic learning can also be used to supplement a model acquired from static analysis.

关键词： Learning automata Training data Power system modeling Heuristic algorithms Bridges Computer science Computerized monitoring Data analysis information analysis Change detection algorithms

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