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[Proceedings] Singapore ICCS/ISITA `92最新文献

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Channel state PDF and throughput analysis for multichannel CSMA systems with imperfect carrier sensing 不完全载波感知多通道CSMA系统的信道状态PDF和吞吐量分析
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255177
S. Glisic, G. Petrovic, D. Bajić, D. Drajic
{"title":"Channel state PDF and throughput analysis for multichannel CSMA systems with imperfect carrier sensing","authors":"S. Glisic, G. Petrovic, D. Bajić, D. Drajic","doi":"10.1109/ICCS.1992.255177","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255177","url":null,"abstract":"An analytical model of a multichannel CSMA system with imperfect channel state estimation is presented. The model itself includes non-persistent, 1-persistent and p-persistent CSMA algorithms. The analysis is based on a two-dimensional Markov process model, its parameters being obtained by statistical averaging. The numerical results of the analysis are also presented.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129341192","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
High-speed calculation on finite element method by digital signal processor 基于数字信号处理器的有限元高速计算
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255070
M. Shibata, N. Iijima, Y. Yoshida, H. Mitsui, M. Sone
{"title":"High-speed calculation on finite element method by digital signal processor","authors":"M. Shibata, N. Iijima, Y. Yoshida, H. Mitsui, M. Sone","doi":"10.1109/ICCS.1992.255070","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255070","url":null,"abstract":"This paper discusses the effects of the introduction of a personal computer with digital signal processor which can perform high-speed parallel processing with pipeline operation to FEM. The DSP is about 200 times faster than the personal computer with C language. The application of the modified symmetric band-matrix technique makes the calculation time faster than with basic symmetric band-matrix.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130072548","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
Method for detecting elliptical pattern using director circle 一种利用指向圆检测椭圆图案的方法
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.254893
Zhao Jun, Garrell Malacad, C. Sodeyama
{"title":"Method for detecting elliptical pattern using director circle","authors":"Zhao Jun, Garrell Malacad, C. Sodeyama","doi":"10.1109/ICCS.1992.254893","DOIUrl":"https://doi.org/10.1109/ICCS.1992.254893","url":null,"abstract":"The rapid and accurate detection of elliptical patterns from images is an important aspect of computer vision systems. An efficient method for detecting elliptical patterns is proposed. The method involves the center detection algorithm (CDA), director circle detection algorithm (DDA), and the form detecting algorithm (FDA). The CDA detects the center coordinates using the feature that there are two pixels in central symmetry with opposite edge orientation. The DDA detects the director circle instead of the semi-minor and semi-major diameters of the ellipse to reduce the parameters. The FDA determines the slope and diameters using the director circle.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130753747","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
On periodic sequences of the maximum linear complexity and M-sequences 最大线性复杂度周期序列与m -序列
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255067
K. Imamura, Guo-Zhen Xiao
{"title":"On periodic sequences of the maximum linear complexity and M-sequences","authors":"K. Imamura, Guo-Zhen Xiao","doi":"10.1109/ICCS.1992.255067","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255067","url":null,"abstract":"This paper gives another proof of a maximum linear complexity property of the periodic sequences over GF(q) of period T=q/sup m/-1 obtained by the minimum changes of an m-sequence, and shows that the converse is also true if the period T=q/sup m/-1 is a prime number.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131835152","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
Data transmission analysis in mobile satellite systems 移动卫星系统中的数据传输分析
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.254909
J. Castro
{"title":"Data transmission analysis in mobile satellite systems","authors":"J. Castro","doi":"10.1109/ICCS.1992.254909","DOIUrl":"https://doi.org/10.1109/ICCS.1992.254909","url":null,"abstract":"An integrated land mobile satellite system (LMSS) envisions the use of satellites to complement existing/planned terrestrial systems to provide mobile communications to thinly populated and/or large geographical areas. But, established LMSSs can also offer competitive support to users in urban environments by extending services to portable terminals with emphasis in 'hand-held' sizes in the future. A LMSS communicating directly to mobile terminal requires the basic link analysis of small fixed terminal, but will have additional channel characteristics, due to the motion of the terminal. This motion introduces spectral changes in the transmitted waveforms that can provoke further degradations relative to those of fixed-point systems. Hence, attenuations are primarily originated by the time-varying multipaths that appear in trying to transmit an electromagnetic field from a satellite to a moving terminal or vehicle, and by rain effects. Therefore in all LMSSs, the communication link between the satellite and the mobile terminal is the most essential and critical part of the transmission path that will influence greatly the performance of the entire system. The author covers some design principles of the LMSS channel and describes its application using Ka-band (30/20 GHz) frequencies.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128838945","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
Experimental study on the level-crossing intervals of sine wave plus Gaussian noise 正弦波加高斯噪声平交间隔的实验研究
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.254946
N. Youssef, T. Munakata, T. Mimaki
{"title":"Experimental study on the level-crossing intervals of sine wave plus Gaussian noise","authors":"N. Youssef, T. Munakata, T. Mimaki","doi":"10.1109/ICCS.1992.254946","DOIUrl":"https://doi.org/10.1109/ICCS.1992.254946","url":null,"abstract":"The authors deal with the level-crossing intervals of a stationary random process. Probability densities of the level-crossing intervals, and correlation coefficients between successive level-crossing intervals of a process consisting of a sine wave plus Gaussian random noise are experimentally investigated by digital simulation. The Gaussian random noise is selected to be of 7-th order Butterworth power spectrum density. The obtained probability densities appear with a number of isolated peaks much larger than the number observed on the corresponding probability densities of the Gaussian noise alone. When the sine wave frequency is greater than or approximately equal to half of the cutoff frequency of the noise spectrum, experimental data suggest that each isolated peak has a Gaussian-like density. The assumption of 'quasi-independence' is not valid for the level-crossing intervals of the existing process.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125446000","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
ISDN technology and its integration into local and wide area computer networks ISDN技术及其与本地和广域计算机网络的集成
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255057
H. Thierbach
{"title":"ISDN technology and its integration into local and wide area computer networks","authors":"H. Thierbach","doi":"10.1109/ICCS.1992.255057","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255057","url":null,"abstract":"This discussion considers in particular the application of ISDN technology to data processing needs, and gives some practical examples showing when an ISDN implementation in an organisation can be feasible.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126743535","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
On the mis-correction due to any one extra bit error of Bose-Rao-Montgomery unidirectional error codes 关于玻色-拉奥-蒙哥马利单向错误码每多一个比特误差所引起的纠错
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.254885
M. Goto, T. Matsumoto
{"title":"On the mis-correction due to any one extra bit error of Bose-Rao-Montgomery unidirectional error codes","authors":"M. Goto, T. Matsumoto","doi":"10.1109/ICCS.1992.254885","DOIUrl":"https://doi.org/10.1109/ICCS.1992.254885","url":null,"abstract":"By modifying the symmetric error correcting codes, Bose and Rao (1984) have obtained the unidirectional error-correcting (UEC) codes for shift register memories by using arithmetic redundancy check (ARC) in stead of cyclic redundancy check. Montgomery (see IEEE Trans. Comput., vol.40, p.1257, 1991) has proposed UEC code that correct any error pattern consisting of unidirectional errors confined to a single track. The UEC codes presented by Bose and Rao are a particular case of the codes by Montgomery. Although the latter is more efficient than the former, these two classes of code are constructed based on the same idea, and so the authors call these codes Bose Rao-Montgomery (BRM) codes. They consider the conditions under which such mis-corrections occur, and show that the row parity for each track is the suitable way of preventing from mis-corrections due to the single bit error in the other track.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126372871","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
An enhanced approach to character recognition by Fourier descriptor 傅里叶描述符字符识别的改进方法
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.254889
G. Man, J. Poon
{"title":"An enhanced approach to character recognition by Fourier descriptor","authors":"G. Man, J. Poon","doi":"10.1109/ICCS.1992.254889","DOIUrl":"https://doi.org/10.1109/ICCS.1992.254889","url":null,"abstract":"A new algorithm of utilizing Fourier descriptors (FDs) as unique features in representation and classification of contours is proposed. It enhances the description of local information and distinguishes similar contours. The characteristic of this algorithm is to represent the object by several sets of FDs which represent different portions of the object in contrast to only one set of FDs which represents the whole object. The authors use a model-based approach in the recognition stage in which these sets, say k sets, of FDs of the input numeral will be matched with each predefined model of the numeral class. It is shown that a higher accuracy rate can be achieved by using a multicategory classifier incorporated with an artificial neural network classifier. Finally, an experiment on numeral recognition by the proposed algorithm is reported.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"10 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114111354","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
Multi-level concatenated block coded modulation schemes 多级串接分组编码调制方案
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255089
D. Rhee, S. Rajpal, Shu Lin
{"title":"Multi-level concatenated block coded modulation schemes","authors":"D. Rhee, S. Rajpal, Shu Lin","doi":"10.1109/ICCS.1992.255089","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255089","url":null,"abstract":"In such a scheme the inner codes are block modulation codes and the outer codes are generally block codes with code symbols from some Galois fields. If the inner codes, outer codes, and the level of concatenation are properly chosen, very good performance can be achieved with high spectral efficiency and large coding gain. Two specific schemes are proposed. Simulation studies show that these perform very well and achieve significant real coding gains over uncoded reference modulation systems.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116742727","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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