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Monitoring the TEC Variation Using GPS Dual Frequency System During Quiet and Disturbed Day 利用GPS双频系统监测静日和扰动日的TEC变化
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451417
N. Ya'acob, M. H. Jusoh, M. Abdullah, M. Ismail
{"title":"Monitoring the TEC Variation Using GPS Dual Frequency System During Quiet and Disturbed Day","authors":"N. Ya'acob, M. H. Jusoh, M. Abdullah, M. Ismail","doi":"10.1109/SCORED.2007.4451417","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451417","url":null,"abstract":"The Global Positioning System (GPS) has become a powerful tool for ionospheric studies. The parameter of the ionosphere that produces most of the effects on radio signals is the total electron content (TEC). This paper reports on the variability of the total electron content (TEC) during the North Sumatra earthquake of 26 December 2004 with a magnitude of 9.3 Richter scale. TEC is measured 7 days before and 6 days after the earthquake. The GPS data is taken from JUPEM (Malaysian mapping and Geodesy department). Four sets of data are selected from different GPS satellites that passed near the earthquake location. Results show that earthquake precursors can be seen at nighttime and early morning beginning from 21 December 2004, which is five days before the occurrence of earthquake until one day before the earthquake, which is on 25 December 2004. The results show a good agreement with other researchers who studied other earthquakes.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128562951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Development of a Novel Random Matrix Spreading Code Generator for WCDMA Rake Receiver WCDMA Rake接收机随机矩阵扩频码发生器的研制
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451416
F. H. Hashim, M. Othman, M. Ismail
{"title":"Development of a Novel Random Matrix Spreading Code Generator for WCDMA Rake Receiver","authors":"F. H. Hashim, M. Othman, M. Ismail","doi":"10.1109/SCORED.2007.4451416","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451416","url":null,"abstract":"This paper describes a proposed spreading method to improve the bit error rate (BER) and user capacity in WCDMA system. The method is applied to the system up-link. The spreading process includes a new proposed random matrix constructed using the Walsh code generator, called randmat spreading code generator. Conventionally, the selection of the Walsh seed is highly dependable on the spreading factor (SF) of the system. This spreading factor has to be in the power of 2. However, by carefully selecting a variable n, to result in SF-h for the input seed to the Walsh code, our simulation results show that the BER can improve dramatically. The proposed multilevel modulation method could also increase the data rate and user capacity of the WCDMA system. To test the functionality of our proposed spreading method, we use a simulation model using MATLAB that is close to the behavior of a mobile station as specified in the WCDMA standards, specifically ETSI TS 125.211 and ETSI TS 125.213.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129671174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and Simulation of X-Band Micromachined Microstrip Antenna x波段微带天线的设计与仿真
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451435
M.F. Islam, M. Ali, B. Majlis
{"title":"Design and Simulation of X-Band Micromachined Microstrip Antenna","authors":"M.F. Islam, M. Ali, B. Majlis","doi":"10.1109/SCORED.2007.4451435","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451435","url":null,"abstract":"There is an increasing demand for newer microwave and millimeter-wave systems to meet the emerging telecommunication challenges with respect to size, performance and cost. Micro electro mechanical systems (MEMS) have several desirable features, including small size, high performance, low power consumption and low loss. This paper presents an X- band probe fed small rectangular microstrip patch antenna based on high-resistivity silicon substrate which is capable to reduce the dimensions of the antenna. The antenna was designed on 0.375 mm-thik substrate using microstrip technology followed by probe feeding technique. Microstrip and probe feeding technique offer easy fabrication process using MEMS technology. The design and simulation of the antenna were performed using 3D full wave electromagnetic simulator IE3D. The antenna with a bandwidth of 118.14 MHz and a center frequency of 9.6 GHz which is within the allowable specturm (9.5-9.8 GHz) for Earth Exploration Satellite System (EESS) was simulated successfully.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126107751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Detection and Classification of Power Quality Disturbances Using Time-Frequency Analysis Technique 基于时频分析技术的电能质量扰动检测与分类
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451404
Abdul Rahim Abdullah, A. Sha'ameri, Abd Rahim Mat Sidek, Mohammad Razman Shaari
{"title":"Detection and Classification of Power Quality Disturbances Using Time-Frequency Analysis Technique","authors":"Abdul Rahim Abdullah, A. Sha'ameri, Abd Rahim Mat Sidek, Mohammad Razman Shaari","doi":"10.1109/SCORED.2007.4451404","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451404","url":null,"abstract":"This paper presents the detection and classifications of power quality disturbances using time-frequency signal analysis. The method used is based on the pattern recognition approach. It consists of parameter estimation followed classification. Based on the spectrogram time-frequency analysis, a set of signal parameters are estimated as input to a classifier network. The power quality events that are analyzed are swell, sag, interruption, harmonic, interharmonic, transient, notching and normal voltage. The parameter estimation is characterized by voltage signal in rms per unit, waveform distortion, harmonic distortion and interharmonic distortion. A rule based system is developed to detect and classify the various types of power quality disturbances. The system has been tested with 100 data for each power quality event at SNR from OdB to 50dB to verify its performance. The results show that the system gives 100 percent accuracy of power quality signals at 30 dB of SNR.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126543591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
EAP-based Authentication with EAP Method Selection Mechanism: Simulation Design 基于EAP的认证与EAP方法选择机制:仿真设计
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451356
M. Bhakti, A. Abdullah, L. T. Jung
{"title":"EAP-based Authentication with EAP Method Selection Mechanism: Simulation Design","authors":"M. Bhakti, A. Abdullah, L. T. Jung","doi":"10.1109/SCORED.2007.4451356","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451356","url":null,"abstract":"Wireless networks have grown rapidly and more becoming part of our life, due to its advantages over the wired network, such as convenience, mobility, and flexibility. However the security concerns in wireless networks might have prevented its further widespread adoption. One of the solutions to overcome the wireless network security concerns is the IEEE 802.1X specification, a mechanism for port-based network access control, which is based on extensible authentication protocol (EAP), an authentication framework that can support multiple authentication methods. This paper proposed a design for an extension to the EAP framework for EAP authentication method selection purpose. The design then can be used to develop a simulation model of the EAP method selection mechanism.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127725160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Evaluation of Modulation and Channel Coding Candidates for Adaptive Data Communication System 自适应数据通信系统调制和信道候选编码的评价
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451362
R. Sidek, A.Z. bin Sha'ameri
{"title":"Evaluation of Modulation and Channel Coding Candidates for Adaptive Data Communication System","authors":"R. Sidek, A.Z. bin Sha'ameri","doi":"10.1109/SCORED.2007.4451362","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451362","url":null,"abstract":"This paper evaluates at the various modulation and coding techniques suitable for adaptive data communication system. The techniques evaluated are applicable to HF spectrum. Examples of modulation and coding scheme that are evaluated include PACTOR I, PACTOR II, PACTOR III, GTOR and STANAG 4285. Analysis of system performance is made in the presence of AWGN with future extension for multipath fading conditions. Comparison will be made based on the bit-error rate (BER), packet-error rate (PER) and the throughput. In addition, the effective data rate for all the schemes is compared with the Shannon capacity limit to ensure the optimal utilization of the given channel bandwidth. The modulation and coding scheme that meets all of the above requirements will be used for future adaptive data communication system.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115264670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient Development Methodology for Multithreaded Network Application 多线程网络应用的高效开发方法
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451394
Nguyen Due Chinh, E. Kandasamy, Lam Yoke Khei
{"title":"Efficient Development Methodology for Multithreaded Network Application","authors":"Nguyen Due Chinh, E. Kandasamy, Lam Yoke Khei","doi":"10.1109/SCORED.2007.4451394","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451394","url":null,"abstract":"Multithreading is becoming increasingly important for modern network programming. In inter-process communication platform, multithreaded applications have much benefit especially to improve application's throughput, responsiveness and latency. However, developing good quality of multithreaded codes is difficult, because threads may interact with each others in unpredictable ways. Although modern compilers can manage threads well, but in practice, synchronization errors (such as: data race errors, deadlocks) required careful management and good optimization method. The goal of this work is to discover common pitfalls in multithreaded network applications, present a software development technique to detect errors and optimize efficiently multithreaded applications. We compare performance of a single threaded network application with multithreaded network applications, use tools called Intelreg VTunetrade Performance Analyzer, Intelreg Thread Checker and our method to efficiently fix errors and optimize performance. Our methodology is divided into three phases: First phase is performance analysis using Intelreg VTunetrade Performance Analyzer with the aim is to identify performance optimization opportunities and detect bottlenecks. In second phase, with Intelreg Thread Checker we allocate data races, memory leakage and debug the multithreaded applications. In third phase, we apply tuning and optimization to the multithreaded applications. With the understanding of the common pitfalls in multithreaded network applications, through the development and debugging methodology aforementioned above, developers are able to optimize and tune their applications efficiently.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127446094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Implementation of Robust SIFT-C Technique for Image Classification 鲁棒SIFT-C图像分类技术的实现
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451374
K. Ghazali, S. S. Mokri, M. Mustafa, A. Hussain
{"title":"Implementation of Robust SIFT-C Technique for Image Classification","authors":"K. Ghazali, S. S. Mokri, M. Mustafa, A. Hussain","doi":"10.1109/SCORED.2007.4451374","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451374","url":null,"abstract":"This paper describes the development of a robust technique for image classification using scale invariant feature transform (SIFT), abbreviated as SIFT-C. The proposed SIFT-C technique was developed to cater for varying conditions such as lightings, resolution and target range which are known to affect classification accuracies. In this study, the SIFT algorithm is used to extract a set of feature vectors to represent the image and the extracted feature sets are then used for classification of two classes of weed. The weeds are classified as either broad or narrow weed type and the decision will be used in the control strategy of weed infestation in palm oil plantations. The effectiveness of the robust SIFT-C technique was put to test using offline weed images that were captured under various conditions which truly reflect the actual field conditions. A classification accuracy of 95.7% was recorded which implies the effectiveness of the SIFT-C.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130569034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Problem Difficulty for Genetic Algorithm in Combinatorial Optimization 遗传算法在组合优化中的问题难度
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451368
Z. Zukhri, K. Omar
{"title":"Problem Difficulty for Genetic Algorithm in Combinatorial Optimization","authors":"Z. Zukhri, K. Omar","doi":"10.1109/SCORED.2007.4451368","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451368","url":null,"abstract":"This paper presents how difficult to handle (genetic algorithm) GA with combinatorial approach in clustering problem and an alternative approach is suggested. Clustering problem can be viewed as combinatorial optimization. In this paper, the objects must be clustered are new students. They must be allocated into a few of classes, so that each class contains students with low gap of intelligence. Initially, we apply GA with combinatorial approach. But experiments only provide a small scale case (200 students and 5 classes). Then we try to apply GA with binary chromosome representation and we evaluate it with the same data. We have successfully improved the performance with this approach. This result seems to indicate that GA is not effective to be applied for solving combinatorial optimization problems in general. We suggest that binary representation approach should be used to avoid this difficulty.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126945481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
EEG Analysis of Wake-sleep Data using UMACE filter 基于UMACE滤波的醒-睡数据脑电分析
2007 5th Student Conference on Research and Development Pub Date : 2007-12-01 DOI: 10.1109/SCORED.2007.4451421
R. Ghafar, N. Tahir, A. Hussain, S. Samad
{"title":"EEG Analysis of Wake-sleep Data using UMACE filter","authors":"R. Ghafar, N. Tahir, A. Hussain, S. Samad","doi":"10.1109/SCORED.2007.4451421","DOIUrl":"https://doi.org/10.1109/SCORED.2007.4451421","url":null,"abstract":"Electroencephalogram (EEG) signal has been found to be the most predictive and reliable indicator in wake-sleep research. It is a real time signal that reflects the brain states of a subject including the alertness. However the study of wake-sleep condition using EEG signal is difficult due to the complexity of the EEG signal itself. The exact underlying dynamics of the EEG data is still questionable. EEG signal varies from one individual to another and has an inter variability in the same physiological state. It is hard to compare the EEG to the specific pattern of individual or situation. This paper tries to investigate the use of UMACE in distinguish between awake and sleep state of a subject. Normal EEG data from individual is used as an input in building UMACE filter. From the result, we find UMACE has the capability to distinguish awake and sleep state of a subject.","PeriodicalId":443652,"journal":{"name":"2007 5th Student Conference on Research and Development","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130358912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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