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Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)最新文献

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Statistical characterization of variable bit rate MPEG-1 encoded video streams 可变比特率MPEG-1编码视频流的统计特性
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760916
S.E. El-Nahas, E. Youssef, M. Moussa, I. Ahmed
{"title":"Statistical characterization of variable bit rate MPEG-1 encoded video streams","authors":"S.E. El-Nahas, E. Youssef, M. Moussa, I. Ahmed","doi":"10.1109/NRSC.1999.760916","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760916","url":null,"abstract":"We present a study of the statistical properties of variable bit rate MPEG-1 encoded video streams. We have examined home video quality PAL sequences. Three sequences were considered in this paper. The first two sequences were from an Egyptian movie (Al Maseer); selected to have different degrees of motion and scene changes. The third one was from a camera-recorded lecture at our lab, showing the instructor moving in front of a white board. These were selected because of the different degree of scene changes within each of them. The experimental setup used to collect the data is illustrated. Frame size traces are gathered from these sequences and statistically analyzed. The goodness of fit of these traces with commonly used statistical distributions is investigated and a good fit probability distribution is determined. Also the autocorrelation properties of these traces are investigated. Such studies are very important in network design and performance analysis.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122071960","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
Signal separation using second and high order statistics 利用二阶和高阶统计量进行信号分离
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760921
M. Fahmy, G. El-Raheem, A. El-Sallam
{"title":"Signal separation using second and high order statistics","authors":"M. Fahmy, G. El-Raheem, A. El-Sallam","doi":"10.1109/NRSC.1999.760921","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760921","url":null,"abstract":"This paper presents two methods for signal separation. One is based on second order statistics while the other is based on fourth and higher order statistics. In either method, the fundamental criterion for separation relies on reducing to zero or at least minimizing, either the output cross correlation or cross cumulant functions, respectively. This is achieved through designing a decoupling multi-input multi-output system. The parameters of this system are determined through solving-in a least squares sense-a linearized set of equations describing either the cross correlation or cross cumulant functions when evaluated for different lags. An alternative rapidly convergent adaptive algorithm is also described for the minimization of each respective function. The paper considers also both FIR and IIR representation of the decoupling system. It shows that using IIR functions in the decoupling system does not offer any merit over the FIR case. Illustrative examples are given to show the performance of the proposed algorithms.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130564528","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: 7
Human face recognition using neural networks 利用神经网络进行人脸识别
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760912
H. El-Bakry, M. Abo El-Soud
{"title":"Human face recognition using neural networks","authors":"H. El-Bakry, M. Abo El-Soud","doi":"10.1109/NRSC.1999.760912","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760912","url":null,"abstract":"Automatic recognition of human faces is a significant problem in the development and application of pattern recognition. We introduce a simple technique for identification of human faces in cluttered scenes based on neural nets. In the detection phase, neural nets are used to test whether a window of 20/spl times/20 pixels contains a face or not. A major difficulty in the learning process comes from the large database required for face/nonface images. We solve this problem by dividing these data into two groups. Such a division results in reduction of computational complexity and thus decreasing the time and memory needed during the testing of an image. For the recognition phase, feature measurements are made through Fourier descriptors. Such features are used as input to the neural classifier for training and recognition of ten human faces. Simulation results for the proposed algorithm show a good performance during testing.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133310817","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: 20
Design of 2-D FIR digital filters with complex coefficients using a least-squares approach 用最小二乘方法设计复系数二维FIR数字滤波器
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760924
E. Abdel-Raheem
{"title":"Design of 2-D FIR digital filters with complex coefficients using a least-squares approach","authors":"E. Abdel-Raheem","doi":"10.1109/NRSC.1999.760924","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760924","url":null,"abstract":"An approach for the design of 2-D FIR digital filters with complex coefficients is presented. In this approach, the error measure is formulated as a quadratic function and the filter coefficients are obtained by solving a set of linear equations. The proposed approach is more efficient than the eigenfilter approach regarding the amount of computation and design time. Moreover, the proposed approach leads to smaller least-squares errors. Design examples are included to illustrate the advantages of the approach.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132328589","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
A dynamic model for neural networks 神经网络的动态模型
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760928
T.E. Dabbous, K.A. Shafie
{"title":"A dynamic model for neural networks","authors":"T.E. Dabbous, K.A. Shafie","doi":"10.1109/NRSC.1999.760928","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760928","url":null,"abstract":"We present a novel dynamical model for neural networks. The model consists of two sets of differential equations: one for the hidden layers and the other for the output layer. Since the model parameters (or weights) are assumed unknown, one may choose these parameters so that the neural output behaves in a certain prescribed manner. The proposed model can be very useful for many engineering applications such as communication, control and system identification. Numerical examples are given to show the effectiveness of the proposed neural model.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133642189","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
Natural radionuclides in soil and shore sediments on Alexandria Mediterranean Sea coast of Egypt 埃及亚历山大地中海沿岸土壤和海岸沉积物中的天然放射性核素
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760945
R. H. Higgy
{"title":"Natural radionuclides in soil and shore sediments on Alexandria Mediterranean Sea coast of Egypt","authors":"R. H. Higgy","doi":"10.1109/NRSC.1999.760945","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760945","url":null,"abstract":"The content of uranium, thorium, potassium in soil and shore sediments from the Mediterranean Sea coast of Alexandria has been determined using a combination of direct gamma spectrometry, radiochemical separation and alpha spectrometry and laser fluorimetry. This study was carried out to detect any radioactive contamination and to obtain a natural radioactive base line. No serious contamination was found.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114114980","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
Microstrip paralleled coupled lines band-pass filters; analyses, design and sensitivity 微带并联耦合线带通滤波器;分析，设计和灵敏度
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760884
M. El-Razzak, N. El-Desouky, H. El-Mikati
{"title":"Microstrip paralleled coupled lines band-pass filters; analyses, design and sensitivity","authors":"M. El-Razzak, N. El-Desouky, H. El-Mikati","doi":"10.1109/NRSC.1999.760884","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760884","url":null,"abstract":"In the present work, the quasi-static spectral domain approach (SDA) is used for the analysis of the coupled suspended microstrip line with tuning septums and the broadside-coupled microstrip lines. The analysis and design of the microstrip half-wavelength coupled line band pass filter is also presented. The sensitivity of the filter response to the resonator structure parameters is considered. The obtained results are compared with the available published data and good agreement is found.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115002725","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
Propagation of X-wave in a planar layered medium x波在平面层状介质中的传播
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760873
A. Attiya, E. El-Diwany, A. Shaarawi
{"title":"Propagation of X-wave in a planar layered medium","authors":"A. Attiya, E. El-Diwany, A. Shaarawi","doi":"10.1109/NRSC.1999.760873","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760873","url":null,"abstract":"A new representation is introduced for the X-wave based on pulsed plane waves. Such representation is found to be quite useful in obtaining more insight into the physical meaning of the X-wave's characteristics. The pulsed plane wave representation is used to study the behavior of X-wave normally and obliquely incident on a planar layered medium. By studying the properties of normally incident X-waves on a planar layered medium, it is found that reflections of X-wave can be used to obtain the properties of the layered medium as an inverse problem.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133600639","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
The optimum conditions of radio sounding of ionosphere for detecting and monitoring of explosions 电离层无线电测深用于爆炸探测和监测的最佳条件
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760946
Y. Drobzheva
{"title":"The optimum conditions of radio sounding of ionosphere for detecting and monitoring of explosions","authors":"Y. Drobzheva","doi":"10.1109/NRSC.1999.760946","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760946","url":null,"abstract":"To determine the optimum conditions of radio sounding of the ionosphere for the remote monitoring of an explosion it is necessary to work out the \"adequate for experiment\" model of acoustic wave propagation from Earth's surface to ionosphere heights, then, the interaction of the acoustic waves with the ionosphere, and to determine the variations of the Doppler shift of the radio wave. Such a model has been worked out at the Institute of Ionosphere. The model has been tested using acoustic and Doppler shift measurements during the Mill Race experiment (surface chemical explosion, power about 500 tons TNT, U.S.A., 1981).","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127616720","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
Performance of the buffered and unbuffered leaky bucket policing mechanism and used feedback control loop in ATM networks ATM网络中有缓冲和无缓冲漏桶监管机制的性能及使用的反馈控制环
Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760896
M. Moussa, B. Nossier, S. El-Ramly
{"title":"Performance of the buffered and unbuffered leaky bucket policing mechanism and used feedback control loop in ATM networks","authors":"M. Moussa, B. Nossier, S. El-Ramly","doi":"10.1109/NRSC.1999.760896","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760896","url":null,"abstract":"This paper investigates the performance of the usage parameter control (UPC) using unbuffered and buffered leaky bucket (LB) mechanism to control the variation in two parameters of the traffic, \"peak (p) and mean bit rate (m)\" for available bit rate (ABR) sources, to obtain less cell loss probability (CLPr) and achieve quality of service (QoS) requirements. After that we used feedback control loop as reactive control together with preventive control to improve this (QoS). The buffer occupancy of a network resource is used as an indication of congestion. Each source which used this path through the congested switch is informed to reduce its activity and the same information is sent to (UPC) to change its parameters. Numerical calculations and simulations are performed for different traffic sources.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127698438","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
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