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2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)最新文献

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Analysis of MMSE beamformer for DS-CDMA systems DS-CDMA系统中MMSE波束形成分析
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953539
N.Y. Wang, P. Agathoklis, A. Antoniou
{"title":"Analysis of MMSE beamformer for DS-CDMA systems","authors":"N.Y. Wang, P. Agathoklis, A. Antoniou","doi":"10.1109/PACRIM.2001.953539","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953539","url":null,"abstract":"The performance of two commonly used criteria to obtain the optimum beamforming weights in adaptive antenna arrays, namely, the chip-based mean-squared-error (MMSE) criterion and the symbol-based MMSE criterion, is investigated and a qualitative explanation for the difference in their performance is given. In the first criterion, spatial diversity is exploited in the determination of the beamforming weights. In the second, code separation and spatial diversity are utilized. It is shown that the utilization of code separation in the determination of beamforming weights leads to less noise magnification resulting from interference rejection. Analysis and simulation results show that the symbol-based MMSE criterion offers a better performance than the chip-based MMSE criterion in the presence of multiple access interference.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134122372","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
Thai OCR error correction using token passing algorithm 使用令牌传递算法的泰国OCR纠错
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953704
M. Rodphon, K. Siriboon, B. Kruatrachue
{"title":"Thai OCR error correction using token passing algorithm","authors":"M. Rodphon, K. Siriboon, B. Kruatrachue","doi":"10.1109/PACRIM.2001.953704","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953704","url":null,"abstract":"Spell checking can be used to improve OCR result, which is quite time consuming for Thai language. Since there is no explicit word boundary, the spell checking has to go through all possible ambiguity characters and word boundaries. This paper proposes a token passing algorithm, which is often used in speech recognition. To this problem, the output of OCR consists of strings of at most 5 most probable characters. The tokens are generated for each letter and are passed to the next 5 characters. Each time the token is passed, the dictionary is used to check for the correct spelling. The wrong spelling tokens are discarded. Word boundary is inserted to the token to correct boundary ambiguity. At the end of the passing processes, all possible correct spelling words are found as long as the correct characters are in the list of 5 characters. Many possible word sequences could be constructed from this process. One best word sequence could be selected using bi-gram, trigram and/or lowest token probability. This method can also handle some insertion and deletion error.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132989083","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: 8
Optimal wavelength allocation and flow assignment in multiwavelength optical networks 多波长光网络中的最佳波长分配和流量分配
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953651
O. Kabranov, D. Makrakis, Charalambos Charalambous, D. Ionescu
{"title":"Optimal wavelength allocation and flow assignment in multiwavelength optical networks","authors":"O. Kabranov, D. Makrakis, Charalambos Charalambous, D. Ionescu","doi":"10.1109/PACRIM.2001.953651","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953651","url":null,"abstract":"Automatically switched optical networks (ASON) require a control strategy that determines the optimal distribution of flows over different wavelengths. Such a strategy will increase the profit, by allowing service providers to quickly and effectively define and deploy new service offers. We introduce a demand elasticity based model for wavelength and flow assignment in multiwavelength optical networks. The model captures the appropriate optical flow for every link and for every wavelength using price/demand elasticity. The model assumes that the physical and logical topology of the optical network, the maintenance cost, and the traffic demands are known parameters. Under these assumptions a mixed integer optimization is used for wavelength allocation and flow assignment of the requested traffic demand and surplus maximization for the transport service supplier, operating the optical network. A case study shows how the bandwidth demand affects the supplier's profit.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115786405","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
A modular system tool for the distance learning 一个模块化的远程教学系统工具
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953680
J. Guedes-Silveira, A. Vieira, R. Balbinot
{"title":"A modular system tool for the distance learning","authors":"J. Guedes-Silveira, A. Vieira, R. Balbinot","doi":"10.1109/PACRIM.2001.953680","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953680","url":null,"abstract":"The work presented in this paper is related with the development and integration of important communication, and creation, tools that allowed the authors to build a flexible and modular system dedicated to distance learning by computer communication. The distance learning system supports many facilities for publication, storage and dissemination of hypermedia documents integrated with multimedia applications such as interactive videoconferencing, voice-over-IP, video-on-demand as well as chat and whiteboard functionalities. Others important characteristics outlined are the possibility to create and manage course's sites, to manage classes, to structure dates and deadlines and mainly to synchronize the different kind of media during sessions.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114521791","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
Delay characteristics of statistical cipher feedback mode 统计密码反馈模式的延迟特性
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953509
H. Heys
{"title":"Delay characteristics of statistical cipher feedback mode","authors":"H. Heys","doi":"10.1109/PACRIM.2001.953509","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953509","url":null,"abstract":"We investigate the delay characteristics of a mode of operation of block ciphers, referred to as statistical cipher feedback (SCFB) mode. We conclude that SCFB can be operated at rates close to maximum efficiency with modest buffer requirements and delays. We also examine the characteristics of the cipher mode for the new Advanced Encryption Standard based on 128-bit blocks and comment on the security of the SCFB mode of operation.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114939668","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
Image tamper detection and recovery system based on discrete wavelet transformation 基于离散小波变换的图像篡改检测与恢复系统
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953548
Kwang-Fu Li, Tung-Shou Chen, S. Wu
{"title":"Image tamper detection and recovery system based on discrete wavelet transformation","authors":"Kwang-Fu Li, Tung-Shou Chen, S. Wu","doi":"10.1109/PACRIM.2001.953548","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953548","url":null,"abstract":"In this paper we propose an image tamper detection and recovery system based on the discrete wavelet transform (DWT) technique. When the system receives an image from a user input, this system will transform the image from its spatial domain to the frequency domain based on the DWT, and extract some information from the frequency domain as the eigenvalue of this image. Then, we hide this eigenvalue in the middle frequency band of the frequency domain as evidence for tamper detection in the future. When we doubt a protected image that may be tampered by other users, we can input this image into the tamper recovery system. If this image was tampered by other users, we can use the eigenvalue that was hidden in the image to recover this image. This system not only can recover the tampered area but there is also no need for the original image to ascertain if the image was tampered with or not, and no need for extra disk space to store extra information to recover the tampered area of the image.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"14 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116032633","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: 40
A new fast 3D wavelet transform algorithm for video compression 一种新的快速三维小波变换视频压缩算法
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953546
E. Moyano, L. Orozco-Barbosa, F. Quiles, A. Garrido
{"title":"A new fast 3D wavelet transform algorithm for video compression","authors":"E. Moyano, L. Orozco-Barbosa, F. Quiles, A. Garrido","doi":"10.1109/PACRIM.2001.953546","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953546","url":null,"abstract":"A new fast 3D wavelet transform based algorithm for video compression is presented. The main difference between it and the classical video compression algorithms is the temporal decomposition. The new algorithm reduces heavily the processing time for compression and decompression of video sequences, keeping or overcoming the quality of the reconstructed sequences. In addition, it cuts the memory demands heavily. Some figures show the experimental results.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123653404","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: 4
A study of the measurement of velocity by image sensors 用图像传感器测量速度的研究
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953570
H. Takada, M. Momozawa, H. Kawano
{"title":"A study of the measurement of velocity by image sensors","authors":"H. Takada, M. Momozawa, H. Kawano","doi":"10.1109/PACRIM.2001.953570","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953570","url":null,"abstract":"We have been investigating sensors for measuring traffic flow using image processing technology. (We call them \"image sensors\".) We have concluded that, in order to introduce them, those engaged in road management should work to evaluate the validity of the measured values and to clarify their purpose. We show some examples of that work using the velocity of cars measured by image sensors.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126016508","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
Application of a hardware synthesis technique for database query optimization 硬件综合技术在数据库查询优化中的应用
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953732
V. Komaragiri, M. Thornton, R. Drechsler
{"title":"Application of a hardware synthesis technique for database query optimization","authors":"V. Komaragiri, M. Thornton, R. Drechsler","doi":"10.1109/PACRIM.2001.953732","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953732","url":null,"abstract":"The size of a typical modern database is on the order of hundreds of Gigabytes (GB) and the need for developing systems for processing such huge amounts of data has emerged. A highly efficient information retrieval method is required to make the process quicker and easier. This paper focuses on this aspect and presents a method to optimize an SQL query for efficient information retrieval. It is shown that an SQL query can be optimized using AND/OR graphs. Experimental results, which show the efficiency of this method, are provided.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"124 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124658808","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
ROM size reduction with low processing cost for direct digital frequency synthesis 直接数字频率合成的ROM尺寸减小和低处理成本
2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233) Pub Date : 2001-08-26 DOI: 10.1109/PACRIM.2001.953579
J. Langlois, D. Al-Khalili
{"title":"ROM size reduction with low processing cost for direct digital frequency synthesis","authors":"J. Langlois, D. Al-Khalili","doi":"10.1109/PACRIM.2001.953579","DOIUrl":"https://doi.org/10.1109/PACRIM.2001.953579","url":null,"abstract":"A novel sine amplitude compression technique is presented for application in low-power direct digital frequency synthesizers. It is based on a systematic approach aimed at exploiting as much redundancy as possible between the value of a phase angle and its sine amplitude. It is shown that a compression ratio of approximately 19.3 is attained, saving four bits of storage per word. The new technique compares favorably with previous designs in that better storage reduction is accomplished at low processing cost. The technique can be used in conjunction with traditional approaches for even greater area and power reduction. A new direct digital frequency synthesizer architecture based on the technique is presented.","PeriodicalId":261724,"journal":{"name":"2001 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (IEEE Cat. No.01CH37233)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129429805","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: 28
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