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Architecture for address auto-configuration in MANET based on Extended Prime Number Address Allocation (EPNA)

WSEAS Transactions on computers 2009年第3期8卷 549-558页

作者： Kumar, Harish Singla, R.K. Computer Science and Engineering UIET Panjab University Chandigarh UT 160014 India Department of Computer Science and Applications Panjab University Chandigarh UT 160014 India

An efficient technique for IP address auto-configuration for nodes is an important component in the MANET setup. Previously proposed approaches either need a broadcast over complete network and / or need a duplicate address detection mechanism leading to an inefficient latency and overhead in assignment of addresses. In this paper, an Extended Prime Number Address Allocation (EPNA) technique has been proposed that is conflict free and distributed technique. EPNA does not require broadcast and address assignment can be completed with in maximum of four hop communications. In this technique a large number of nodes are empowered to act as proxies to assign the addresses and most of the time it is one-hop communication. Analytical results show that EPNA is capable of auto-configuring any node without much latency and overhead irrespective of address space. The proposed algorithm also gives even IP address distribution and low complexity for small as well large sized MANET.

关键词： Network architecture

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Modeling and analysis of adaptive buffer sharing scheme for consecutive packet loss reduction in broadband networks

引用

World Academy of science, engineering and Technology 2009年 39卷 418-425页

作者： Kausha, Sakshi Sharma, R.K. Department of Computer Science and Engineering University Institute of Engineering and Technology Panjab University Chandigarh India School of Mathematics and Computer Applications Thapar University Patiala India

High speed networks provide realtime variable bit rate service with diversified traffic flow characteristics and quality requirements. The variable bit rate traffic has stringent delay and packet loss requirements. The burstiness of the correlated traffic makes dynamic buffer management highly desirable to satisfy the Quality of Service (QoS) requirements. This paper presents an algorithm for optimization of adaptive buffer allocation scheme for traffic based on loss of consecutive packets in data-stream and buffer occupancy level. Buffer is designed to allow the input traffic to be partitioned into different priority classes and based on the input traffic behavior it controls the threshold dynamically. This algorithm allows input packets to enter into buffer if its occupancy level is less than the threshold value for priority of that packet. The threshold is dynamically varied in runtime based on packet loss behavior. The simulation is run for two priority classes of the input traffic - realtime and non-realtime classes. The simulation results show that Adaptive Partial Buffer Sharing (ADPBS) has better performance than Static Partial Buffer Sharing (SPBS) and First In First Out (FIFO) queue under the same traffic conditions.

关键词： Quality of service

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CPDCF for IEEE 802.11 WLANs

CPDCF for IEEE 802.11 WLANs

引用

2009 4th International Conference on Communications and Networking in China, CHINACOM 2009

作者： Chen, Chia-Mei Wang, Chi-Hsuan Wu, Mingzoo Department of Management Information System National Sun Yat-sen University Taiwan Department of Computer Science and Information Engineering National Cheng Kung University China Innovative DigiTech-Enabled Applications and Services Institute Institute for Information Industry Taiwan

ISBN: (纸本)9781424443376

The contention-based DCF suffers from collision seriously under heavy load conditions. In this paper, a novel medium access control protocol called Contention-Polling Duality Coordination Function (CPDCF) is proposed to enhance the DCF-based MAC protocol. A polling ACK mechanism is introduced to admit the designated station to transmit without performing any contention process. By eliminating collisions and preventing waste from idle backoff slots, the system capacity is increased effectively. A mathematical model is developed to analyze the saturation throughput of the CPDCF with various CP combinations. The performance in terms of fairness is studied as well. The model accuracy is verified via extensive simulations. Numerical results show that the well-managed CPDCF can achieve a significantly higher system capacity than the legacy DCF does. The proposed CPDCF is quite feasible, effective, and can be easily integrated with the widespread DCF-based devices.

关键词： Wireless local area networks (WLAN)

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A framework for personalized health trend analysis

A framework for personalized health trend analysis

引用

10th International Symposium on Pervasive Systems, Algorithms, and Networks, I-SPAN 2009

作者： Lan, Guo-Cheng Lee, Chao-Hui Wu, Jin-Shang Li, Huan-Chung Ho, Shing-Hua Tseng, Vincent S. Department of Computer Science and Information Engineering National Cheng-Kung University Tainan 701 Taiwan Institute of Computer Science and Information Engineering Institute of Medical Informatics National Cheng-Kung University Tainan 701 Taiwan Department of Family Medicine National Cheng-Kung University Tainan 701 Taiwan Innovative Digitech-Enabled Applications and Services Institute Institute for Information Industry Taipei 105 Taiwan Innovative Digitech-Enabled Applications and Services Institute Institute for Information Industry Kaohsiung 806 Taiwan

ISBN: (纸本)9780769539089

In recent years, with the development of the economy and the advancement of the national income, personal healthcare has been becoming an important issue. Since the health examination can help people understand their own health conditions clearly, many people make regularly health examinations to avoid missing the best treatment time. So the health examination is an important role for people's health statuses. However, people only get aware of the result of health examination report but they are not clear whether their health trends are high-risk or not. In this paper, we proposed a novel framework for discovering health risk patterns and the relationships between the patterns and a target disease by mining historic health examination data. Moreover, a prediction model for the target disease can be constructed effectively by the discovered information. Through the framework, the physicians can early provide health alerts and medical treatments for people to effectively increase the quality of disease prevention. © 2009 IEEE.

关键词： Health risks

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Robust lunar spacecraft autopilot design using high-order sliding mode control

Robust lunar spacecraft autopilot design using high-order sl...

引用

作者： Orr, Jeb S. Shtessel, Yuri B. Science Applications International Corporation Huntsville AL 35802 United States University of Alabama in Huntsville Huntsville AL 35816 United States Advanced Technology Division United States Department of Electrical and Computer Engineering United States

ISBN: (纸本)9781563479786

Abstract Robust performance of a flight control system in the presence of parametric uncertainty and external disturbances is of paramount importance to a manned space flight program. The present research is concerned with the design of an autopilot that uses high-order sliding mode (HOSM) control principles so as to enhance the robustness properties of a lunar landing vehicle during the approach phase of powered descent. The design technique is applied to a high-fidelity simulation of the Apollo Lunar Module (LM). The design efficiently utilizes both the reaction control system (RCS) actuators and the severely rate-limited gimbal drive actuator (GDA) to effect smooth detection and compensation of sensed angular acceleration disturbances about the vehicle's control axes. The integration of a HOSM control law for the RCS effectors with a HOSM disturbance observer is shown to provide performance comparable to that of the heritage autopilot and may also avoid some difficulties encountered in the Apollo flights. Performance is maintained with the controller implemented in discrete time in the presence of a realistic vehicle and sensor model, demonstrating a unique application of sliding mode control to a complex aerospace system. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Moon

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Modified Version of Playfair Cipher Using Linear Feedback Shift Register

Modified Version of Playfair Cipher Using Linear Feedback Sh...

引用

International Conference on Information Management and engineering, ICIME

作者： Packirisamy Murali Gandhidoss Senthilkumar Department of Computer Science and Engineering Periyar Maniammai University Thanjavur India Department of Computer Applications Periyar Maniammai University Thanjavur India

ISBN: (纸本)9781424437740

In this paper we present a new approach for secure transmission of message by modified version of Playfair cipher combining with random number generator methods. To develop this method of encryption technique, one of the simplest methods of random number generator methods called linear feedback shift register (LFSR) has been used. Playfair cipher method based on polyalphabetic cipher. It is relatively easy to break because it still leaves much of the structure and a few hundred of letters of ciphertext are sufficient. Here we are mapping random numbers to secret key of Playfair cipher method and corresponding numbers will be transmitted to the recipient instead of alphabetical letter. This method rapidly increases security of the transmission over an unsecured channel.

关键词： Linear feedback shift registers Random number generation Shift registers Cryptography Random sequences Feedback circuits State feedback Flip-flops Information management computer science

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Enhanced Security for Passport Protocol

Enhanced Security for Passport Protocol

引用

IEEE International Advance Computing Conference, IACC

作者： S. S. Tyagi R. K. Chauhan Department of Computer Science & Engineering Career Institute of Technology and Management Faridabad Haryana India Department of Computer Science & Applications Kurukshetra University Kurukshetra Haryana India

In this paper, I present a new approach for generating sub-words using the Chebyshev Polynomials in place of traditional S-Box formation in AES algorithm, which is based on using look-up tables. S-Box computation is a time-consuming operation in AES algorithm as it is required in every round. So it is desirous to overcome the overhead of S-Box computation using any other computational techniques. It is in my best of knowledge that it is a truly new approach for expanding keys in Passport Protocol.

关键词： Security Protocols Authentication Web server Cryptography computer science Databases engineering profession Chebyshev approximation Polynomials

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Negative correlation in incremental learning

引用

Natural Computing 2009年第2期8卷 289-320页

作者： Minku, Fernanda Li Inoue, Hirotaka Yao, Xin The Centre of Excellence for Research in Computational Intelligence and Applications (CERCIA) School of Computer Science The University of Birmingham Birmingham B15 2TT Edgbaston United Kingdom Department of Electrical Engineering and Information Science Kure National College of Technology Kure Hiroshima 737-8506 2-2-11 Agaminami Japan

Negative Correlation Learning (NCL) has been successfully applied to construct neural network ensembles. It encourages the neural networks that compose the ensemble to be different from each other and, at the same time, accurate. The difference among the neural networks that compose an ensemble is a desirable feature to perform incremental learning, for some of the neural networks can be able to adapt faster and better to new data than the others. So, NCL is a potentially powerful approach to incremental learning. With this in mind, this paper presents an analysis of NCL, aiming at determining its weak and strong points to incremental learning. The analysis shows that it is possible to use NCL to overcome catastrophic forgetting, an important problem related to incremental learning. However, when catastrophic forgetting is very low, no advantage of using more than one neural network of the ensemble to learn new data is taken and the test error is high. When all the neural networks are used to learn new data, some of them can indeed adapt better than the others, but a higher catastrophic forgetting is obtained. In this way, it is important to find a trade-off between overcoming catastrophic forgetting and using an entire ensemble to learn new data. The NCL results are comparable with other approaches which were specifically designed to incremental learning. Thus, the study presented in this work reveals encouraging results with negative correlation in incremental learning, showing that NCL is a promising approach to incremental learning. © Springer science+Business Media B.V. 2007.

关键词： Classification Incremental learning Multi-layer perceptrons Negative correlation learning Neural network ensembles Self-generating neural tree Self-organising neural grove

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Feature Selection for Visual Clustering

Feature Selection for Visual Clustering

引用

International Conference on Advances in Recent Technologies in Communication and Computing, ARTCom

作者： P. Alagambigai K. Thangavel Department of Computer Applications Easwari Engineering College Chennai Tamil Nadu India Department of Computer Science Periyar University Salem Tamil Nadu India

VISTA, a dynamic information visualization system, which allows the user to interactively observe potential clusters in a series of continuously changing visualizations, incorporates the algorithmic clustering results, and serves as an effective validation and refinement tool for irregularly shaped clusters. The validation and visual clustering is performed by tuning the parameter alpha for dominating attributes. Identification of the dominating attributes for visual tuning and visual distance computation process becomes tedious, when the dimensionality of the dataset increases. One common approach to solve this problem is dimensionality reduction. Most of the existing dimensionality reduction techniques are ldquowrapper methodsrdquo, that requires the use of class labels. This paper proposes a novel filter feature selection method for interactive visual clustering based on the outlier score of the features. The experimental results show that the proposed method works well in finding the dominating attributes and eases the visual distance computation process.

关键词： Image segmentation Clustering algorithms Color computer vision Image recognition Pattern recognition Machine learning Artificial intelligence Communications technology Clustering methods

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JS2DR2: An Effective Two-Level Job Scheduling Algorithm and Two-Phase Dynamic Replication Strategy for Data Grid

JS2DR2: An Effective Two-Level Job Scheduling Algorithm and ...

引用

International Conference on Advances in Computing, Control, & Telecommunication Technologies (ACT)

作者： P.K. Suri Manpreet Singh Department of Computer Science & Applications Kurukshetra University Kurukshetra India Department of Computer Engineering M.M.Engineering College Maharishi Markandeshwar University Ambala Haryana India

Data grid supports a variety of scientific applications that require access to large amount of data with various qualities of service requirements. Ensuring efficient access to such large and widely distributed datasets is hindered by high latencies. Effective scheduling in grid can reduce the amount of data transferred among nodes by dispatching a job to node where most of the required data is available. In addition to efficient scheduling, dynamic replication strategies are regarded as one of the major optimization technique for reducing access latency. In this paper, we propose a two-phase dynamic replication strategy coupled with two-stage job scheduling to provide an integrated environment for efficient access to data and job scheduling. Simulation results demonstrate that JS 2 DR 2 improves the data access time in data grids and the gain increases with the increase in work load.

关键词： Scheduling algorithm Processor scheduling Dynamic scheduling Grid computing Delay Telecommunication computing Availability Application software Cost function Heuristic algorithms

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