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Mobility models towards the performance of geographical-based route maintenance strategy in DSR

Mobility models towards the performance of geographical-base...

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International Symposium on Information Technology, ITSim

作者： Muhammad Farhan Sjaugi Mohamed Othman Mohd. Fadlee A. Rasid Department of Communication System and Network Faculty of Computer Science and Information Technology Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Computer and Communication System Engineering Faculty of Engineering Malaysia Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

In the future, Mobile Ad hoc Networks (MANET)s are expected to be deployed in myriads of scenarios having complex node mobility and connectivity dynamics. Unfortunately, these complex movement scenarios give a tough challenge to the MANET routing protocol. We reviewed some mobility models that have different mobility characteristic, and also studied the effect of these mobility models towards the performance of geographical-based route maintenance strategy in the Dynamic Source Routing (DSR) protocol.

关键词： Routing protocols Distance measurement Mobile communication Traffic control Mobile ad hoc networks Maintenance engineering Protocols

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Double-pass chirped bragg grating erbium-doped fiber amplifier: Improved transmission distance

Double-pass chirped bragg grating erbium-doped fiber amplifi...

引用

IEEE 2008 6th National Conference on Telecommunication Technologies and IEEE 2008 2nd Malaysia Conference on Photonics, NCTT-MCP 2008

作者： Jamaludin, M.Z. Abdullah, M.K. Abdullah, F. Rahman, F.A. Mahdi, M.A. Dept. of Electronic and Communication Engineering Universiti Tenaga Nasional KM 7 Jalan Kajang-Puchong 43009 Kajang Selangor Malaysia Photonics Lab Dept. of Computer and Communication System Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Faculty of Electrical Engineering Multimedia University Cyberjaya Malaysia

ISBN: (纸本)9781424422159

The paper discussed on experimental result that improve the transmission distance by use of an integrated dispersion compensated double-pass Erbium-doped Fiber Amplifier (DPCEDFA). The chromatic dispersion compensation is achieved using chirped fiber Bragg grating as part of the EDFA design. The eye-pattern, eye-opening and timing jitter obtained using this technique shows an improvement equivalent to the distance of about 50km compared with the conventional double-pass EDFA (DP-EDFA). © 2008 IEEE.

关键词： Erbium doped fiber amplifiers

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A New Scalable Reliable Multicast Transport Protocol Using Perfect Buffer Management

A New Scalable Reliable Multicast Transport Protocol Using P...

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2008 International Conference on computer and communication engineering (ICCCE 2008), vol.3

作者： Adznan B. Jantan Sakher A. Hatem Ali Alsayh Sabira Khatun Mohd. Fadlee B. A. Rasid Department of Computer and Communication Engineering Malaysia Department of Computer and Communication Engineering UPM Malaysia Faculty of Computer Science Sana'a University Yemen Faculty of Computer Science Sana'a University

Hierarchical reliable multicast transport protocols partition group members into local groups and allocate one local repair node for each local group to distribute the task of detecting and recovering lost packets. This repair node uses the data stored in its buffer to retransmit the requested packets to the requesting receivers. The problem is that they keep these packets for a long time until they get acknowledgments from all their children receivers of correctly receiving these packets. Keeping these packets creates a congestion problem which decreases the network throughput. This paper proposes a new scheme to solve this problem, by distributing the required packets between the repair node which we call it here the control receiver and some selected receives that have already received these packets correctly. The distribution of the packets decreases the number of packets in the repair node buffer, thus solve the congestion problem and increase the network throughput.

关键词： Multicast protocols Transport protocols Buffer storage Throughput Scalability Reliability engineering Bandwidth Proposals Pediatrics Conference management

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Semantics based buffer reduction for queries over XML data streams

Semantics based buffer reduction for queries over XML data s...

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19th Australasian Database Conference, ADC 2008

作者： Yang, Chi Liu, Chengfei Li, Jianxin Yu, Jeffrey Xu Wang, Junhu Faculty of Information and Communication Technologies Swinburne University of Technology Melbourne VIC 3122 Australia Department of System Engineering and Engineering Management The Chinese University of Hong Kong Hong Kong School of Information and Communication Technology Griffith University Gold Coast QLD 4222 Australia

With respect to current methods for query evaluation over XML data streams, adoption of certain types of buffering techniques is unavoidable. Under lots of circumstances, the buffer scale may increase exponentially, which can cause memory bottleneck. Some optimization techniques have been proposed to solve the problem. However, the limit of these techniques has been defined by a concurrency lower bound and been theoretically proved. In this paper, we show through an empirical study that this lower bound can be broken by taking semantic information into account for buffer reduction. To demonstrate this, we build a SAX-based XML stream query evaluation system and design an algorithm that consumes buffers in line with the concurrency lower bound. After a further analysis of the lower bound, we design several semantic rules for the purpose of breaking the lower bound and incorporate these rules in the lower bound algorithm. Experiments are conducted to show that the algorithms deploying semantic rules individually and collectively all significantly outperform the lower bound algorithm that does not consider semantic information. © 2008, Australian computer Society, Inc.

关键词： Semantics

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Medical image segmentation using fuzzy c-mean (FCM), Bayesian method and user interaction

Medical image segmentation using fuzzy c-mean (FCM), Bayesia...

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International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR)

作者： Mohammad Ali Balafar Abd.Rahman Ramli M.Iqbal Saripan Syamsiah Mashohor Department of Computer & Communication System Faculty of Engineering UPM Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

Image segmentation is one of the most important parts of clinical diagnostic tools. Medical images mostly contain noise and in homogeneity. Therefore, accurate segmentation of medical images is a very difficult task. However, the process of accurate segmentation of these images is very important and crucial for a correct diagnosis by clinical tools. In this paper a new method is proposed which is robust against in-homogeneousness and noisiness of images. The user selects training data for each target class. Noise is reduced in image using Stationary wavelet Transform (SWT) then FCM clusters input image to the n clusters where n is the number of target classes. User selects some of the clusters to be partitioned again. FCM clusters each user selected cluster to two sub clusters. This process continues until user to be satisfied. Each cluster is considered as a sub-class. Posterior probability of data to each sub class is calculated using data in those sub-classes. Probability density of each target class at sub classes is calculated using training data. Probability of data to each target class is calculated using probability density of each subclass at input data and probability of each subclass to each target class. At last, the image is clustered using probability of data to each target class. Segmentation of several simulated and real images are demonstrated to show the effectiveness of the new method.

关键词： Probability Image segmentation Training data Biomedical imaging Medical diagnostic imaging Noise Probability density function

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Unequal error protection for wireless data transmission using coding with feedback

Unequal error protection for wireless data transmission usin...

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2008 International Conference on Innovations in Information Technology, IIT 2008

作者： Tahir, Yaseen H. Al-Hussaibi, Walid Kyun, Ng Chee Noordin, Nor K. Al-Hemyari, Ali Department of Computer and Communication Systems Engineering Faculty of Engineering University Putra Malaysia UPM 43400 Serdang Selangor Darul Ehsan Malaysia Engineering Dept School of SciTech University of Sussex Brighton United Kingdom

ISBN: (纸本)9781424433971

High quality of data transmission services is an important task for wireless broadband communication systems. This paper is concerned with the design problem of real-time wireless data transmission which provides unequal error protection (UEP). Using superposition coding, the rea-time data stream is divided into two streams, high priority (HP) and low priority LP streams depending on their interest. These two bit streams are encoded separately, and then superimposed together with two different level of power to achieve the UEP for them in the receiver end. Feedback of channel state information (CSI) is used in adaptive physical layer channel for efficient use of the current available bandwidth. In this proposed scheme, same recourses;time, bandwidth and power are used to increase the transmission efficiency compared with other schemes which are use transmission of one data stream with one power level but in different techniques to exploit the available bandwidth. © 2008 IEEE.

关键词： Channel state information

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A PSO tuning approach for lip detection on color images

A PSO tuning approach for lip detection on color images

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EMS 2008, European Modelling Symposium, 2nd UKSim European Symposium on computer Modelling and Simulation

作者： Nasiri, Jalal A. Yazdi, H. Sadoghi Moulavi, M. Amir Rouhani, M. Shargh, A. Eshghi Communication and Computer Research Center Department of Computer Engineering Ferdowsi University Mashhad Iran Department of Electrical Engineering Tarbiat Moallem University Sabzevar Iran Center Ferdowsi University Mashhad Iran Department of Electrical Engineering Islamic Azad University Gonabad Branch Iran Faculty of Engineering Islamic Azad University Mashhad Iran

ISBN: (纸本)9780769533254

Lip detection is used in many applications such as face detection and lips reading. We have proposed a novel approach for detecting lip using Particle Swarm Optimization (PSO). PSO is used to obtain an optimized map. The image is mapped to YCbCr color space. The main idea of the method is based on that lip has the high values of Cr and low values of Cb. The proposed algorithm has been examined on CVL and Iranian databases and we have reached to the %92 correction rate which comparing to the previous approach, there is %11 increase in lip detection. We find out that the proposed algorithm is flexible which it is independent of lightening conditions. © 2008 IEEE.

关键词： Face recognition

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Optimization of Ground Penetrating Radar (GPR) Mixture Model in Road Pavement Density Data Analysis

Optimization of Ground Penetrating Radar (GPR) Mixture Model...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Helmi Zulhaidi Mohd Shafri RSA Raja Abdullah Mardeni Roslee Ratnasamy Muniandy Department of Civil Engineering Universiti Putra Malaysia Serdang Malaysia Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Malaysia

This paper presents an optimization of GPR mixture model based on the measurements and simulation results at frequency range of 1.7-2.6 GHz. The purpose is to get a most accurate relationship between attenuation and density for various road pavements densities. The proposed method is simple, fast, nondestructive and accurate way to determine the density of road pavement. Density is a one of the important parameter in order to determine the compressive strength of road pavement. In laboratory, a few of received signal strength and measured attenuation for nine road pavement slab samples were taken at four different frequencies. The GPR mixture model has been used to produce the predicted attenuation due to the pavement density. The calculation and selection of mixture model has been discussed thoroughly and only the best performance of GPR mixture model was selected for optimization.

关键词： Ground penetrating radar Data analysis Density measurement Electromagnetic measurements Space technology Power measurement Frequency measurement Attenuation measurement Road safety Permittivity

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An Adaptive TCP Delayed Acknowledgment Strategy in Interaction with MAC Layer over Multi-hop Ad Hoc Networks

An Adaptive TCP Delayed Acknowledgment Strategy in Interacti...

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International Symposium on computer Science and its Applications, CSA

作者： Farzaneh R. Armaghani Sudhanshu S. Jamuar Sabira Khatun Mod F.A. Rasid Department of Computer and Communication System Engineering Universiti Putra Malaysia Malaysia Department of Computer and Communication System Engineering Department of Electrical and Electronic Engineering University Putra Malaysia Malaysia Universiti Putra Malaysia Serdang Selangor MY

ISBN: (纸本)9780769534282

The acknowledgment strategy has great potential to increase the TCP throughput when it runs over 802.11 MAC protocol. In particular, TCP acknowledgments carry out an extensive number of medium accesses as they compete in the same route as data packets for media. As the load increases, the well-known hidden terminal effects caused by interference between ACK and data packets in MAC layer can degrade TCP performance dramatically if TCP acknowledges every incoming data packets. In this paper a dynamic TCP-MAC interaction strategy has been proposed which tries to reduce the number of induced ACKs by monitoring the channel condition. To this end, the total collision probability collected along the path from sender to receiver in MAC layer has been used to properly set the number of delayed ACKs (DA) in TCP. Based on the measured collision probability, TCP sender dynamically adjusts itself to the channel condition by delaying less ACKs in high traffics and more in low traffic conditions. The simulation results show a throughput improvement up to 15% over the existing method called dynamic adaptive acknowledgment (TCP-DAA) and much more over the regular TCP in the scenarios dealing with a dynamic loss rate.

关键词： Throughput Receivers Topology Monitoring Media Access Protocol Wireless networks Network topology

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Analysis of angle diversity in MIMO channel

Analysis of angle diversity in MIMO channel

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IEEE 2008 6th National Conference on Telecommunication Technologies and IEEE 2008 2nd Malaysia Conference on Photonics, NCTT-MCP 2008

作者： Rose, M.R. Che Suaidi, M.K. Aziz, M.Z.A. Abd Kadir, M.F. Abdul Misman, D. Shah, M.S.R. Mohd Rahim, M.K.A. Department of Telecommunication Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka Hang Tuah Jaya Ayer Keroh 75450 Melaka Malaysia Wireless Communication Center Faculty of Electrical Engineering Universiti Teknologi Malaysia 81300 Skudai Johor Malaysia

ISBN: (纸本)9781424422159

This paper present the results and performance of angle diversity for direction of arrival OOA) setup. The 4x4 Butler Matrix was been used at transmitter and receiver sides. The 2x2 rectangular patches have been used as a transmitter and receiver medium for wireless transmission. The operating frequency for this measurement is 2.4GHz in WLAN application. This paper analyze about DOA and AOA for angle diversity technique. © 2008 IEEE.

关键词： Transmitters

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