Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652201
M. Thathachar, M. Arvind
This paper addresses the problem of modeling the relationships between observed samples of data as a distribution. An L-step dependent model is constructed and an online algorithm is designed for the model in order to minimize the Kullback measure. The algorithm is analyzed to show that it converges weakly to global optimum of Kullback measure for that model. Simulation studies indicate that the algorithm has better tracking properties for time-varying distributions, when compared with statistical estimation procedures.
{"title":"Online algorithms for modeling distributions using examples","authors":"M. Thathachar, M. Arvind","doi":"10.1109/ICICS.1997.652201","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652201","url":null,"abstract":"This paper addresses the problem of modeling the relationships between observed samples of data as a distribution. An L-step dependent model is constructed and an online algorithm is designed for the model in order to minimize the Kullback measure. The algorithm is analyzed to show that it converges weakly to global optimum of Kullback measure for that model. Simulation studies indicate that the algorithm has better tracking properties for time-varying distributions, when compared with statistical estimation procedures.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"66 1","pages":"1315-1318 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72656696","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652177
Roman Kepski, J. Cytowski, Teodor Buchner, L. Małecka
An adaptive filtering system for the assessment of a dynamically changing exercise ECG signal is described. The system is composed of two time-sequenced recurrent filters working in parallel. At the output the differential signal component related to the exercise with improved signal to noise ratio is obtained. The system showed its clinical usefulness in the assessment of the patients with hypertrophic cardiomyopathy and revealed its superiority compared with the signal averaging process used as standard.
{"title":"Adaptive filtering in dynamically changing high resolution ECG","authors":"Roman Kepski, J. Cytowski, Teodor Buchner, L. Małecka","doi":"10.1109/ICICS.1997.652177","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652177","url":null,"abstract":"An adaptive filtering system for the assessment of a dynamically changing exercise ECG signal is described. The system is composed of two time-sequenced recurrent filters working in parallel. At the output the differential signal component related to the exercise with improved signal to noise ratio is obtained. The system showed its clinical usefulness in the assessment of the patients with hypertrophic cardiomyopathy and revealed its superiority compared with the signal averaging process used as standard.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"122 1","pages":"1216-1220 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75345883","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.647150
Weili Tang, Y. Aoki
The recent growth of networked multimedia systems has caused the need for intellectual property rights, like images, music and movies. One approach to solve this problem is to add an invisible image to an image that can be used to provide solid proof of ownership. These invisible images or signatures are known as digital watermarks. In this paper, we describe two techniques for watermarking. A discrete cosine transform algorithm is performed to implement the middle-band embedding for an original image. A differential pulse code modulation method is used to permute a watermark image. The results show that our methods are valid in embedding a watermark in an image, also proves to be effective in decreasing mosquito noise.
{"title":"A DCT-based coding of images in watermarking","authors":"Weili Tang, Y. Aoki","doi":"10.1109/ICICS.1997.647150","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647150","url":null,"abstract":"The recent growth of networked multimedia systems has caused the need for intellectual property rights, like images, music and movies. One approach to solve this problem is to add an invisible image to an image that can be used to provide solid proof of ownership. These invisible images or signatures are known as digital watermarks. In this paper, we describe two techniques for watermarking. A discrete cosine transform algorithm is performed to implement the middle-band embedding for an original image. A differential pulse code modulation method is used to permute a watermark image. The results show that our methods are valid in embedding a watermark in an image, also proves to be effective in decreasing mosquito noise.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"180 1","pages":"510-512 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77237868","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652282
Kyeong-Yeol Yu, T. Choi, Eunyoung Sohn
As the information super highway being constructed, many kinds of multimedia on demand services, attracting significant attention, is being tested, and will be realized sooner or later. Considering these social environments, we have implemented a video on demand system. This paper describes the system architecture of the implemented video on demand system, and proposes the efficient structure for users to provide an easy Internet access method. Also, by a navigating service menu with a Web browser, the user can interact with the service provider more easily. Our system harmonizes Internet and VOD services using the World Wide Web.
{"title":"The integration of VOD and Internet services","authors":"Kyeong-Yeol Yu, T. Choi, Eunyoung Sohn","doi":"10.1109/ICICS.1997.652282","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652282","url":null,"abstract":"As the information super highway being constructed, many kinds of multimedia on demand services, attracting significant attention, is being tested, and will be realized sooner or later. Considering these social environments, we have implemented a video on demand system. This paper describes the system architecture of the implemented video on demand system, and proposes the efficient structure for users to provide an easy Internet access method. Also, by a navigating service menu with a Web browser, the user can interact with the service provider more easily. Our system harmonizes Internet and VOD services using the World Wide Web.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"119 1","pages":"1686-1690 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77480532","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652067
Guang-Bin Hiiang, H. Babri
We show that standard feedforward neural networks with as few as a single hidden layer and arbitrary bounded nonlinear (continuous or noncontinuous) activation functions which have two unequal limits in infinities can uniformly approximate (in contrast to approximate measurably) arbitrary bounded continuous mappings on R/sup n/ with any precision. Especially, in a compact set of R/sup n/, standard feedforward neural networks with as few as a single hidden layer and arbitrary bounded nonlinear (continuous or noncontinuous) activation functions can uniformly approximate arbitrary continuous mappings with any precision. These results also hold for multi-hidden layer standard feedforward neural networks. We found that the boundedness and unequal limits at infinities conditions on the activation functions are sufficient, but not necessary.
{"title":"General approximation theorem on feedforward networks","authors":"Guang-Bin Hiiang, H. Babri","doi":"10.1109/ICICS.1997.652067","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652067","url":null,"abstract":"We show that standard feedforward neural networks with as few as a single hidden layer and arbitrary bounded nonlinear (continuous or noncontinuous) activation functions which have two unequal limits in infinities can uniformly approximate (in contrast to approximate measurably) arbitrary bounded continuous mappings on R/sup n/ with any precision. Especially, in a compact set of R/sup n/, standard feedforward neural networks with as few as a single hidden layer and arbitrary bounded nonlinear (continuous or noncontinuous) activation functions can uniformly approximate arbitrary continuous mappings with any precision. These results also hold for multi-hidden layer standard feedforward neural networks. We found that the boundedness and unequal limits at infinities conditions on the activation functions are sufficient, but not necessary.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"171 1","pages":"698-702 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77488141","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652173
C.L. Brown, A. Zoubir
The use of an alternative to the kernel characteristic function estimator and empirical characteristic function based Gaussianity tests, has been proposed. It uses a smoothed difference function found by applying a smoothing kernel to the difference between the empirical characteristic function and the characteristic function under H/sub 0/. After an investigation into the choice of test statistics, an omnibus test is proposed that is powerful against a wide range of alternatives. Different test statistics are proposed to increase power against symmetric and/or asymmetric alternatives. Simulations are performed, confirming the increased power due to the smoothed difference function, as well as the rationale behind the choice of test statistics.
{"title":"A new approach to testing Gaussianity with the characteristic function","authors":"C.L. Brown, A. Zoubir","doi":"10.1109/ICICS.1997.652173","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652173","url":null,"abstract":"The use of an alternative to the kernel characteristic function estimator and empirical characteristic function based Gaussianity tests, has been proposed. It uses a smoothed difference function found by applying a smoothing kernel to the difference between the empirical characteristic function and the characteristic function under H/sub 0/. After an investigation into the choice of test statistics, an omnibus test is proposed that is powerful against a wide range of alternatives. Different test statistics are proposed to increase power against symmetric and/or asymmetric alternatives. Simulations are performed, confirming the increased power due to the smoothed difference function, as well as the rationale behind the choice of test statistics.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"36 1","pages":"1198-1202 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78023447","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652242
P. Y. Kam, T. Cheong
An approximate, linearized analysis for the phase error probability density function (PDF) for the Mth power carrier recovery structure under the additive white Gaussian noise (AWGN) channel with constant unknown carrier phase and random-walk carrier phase channel models are presented. From the analysis, the optimum receiver parameters for a given channel condition can then be obtained analytically. With the analysis for the phase error PDF, the bit error rate (BER) can be determined analytically.
{"title":"Analysis of Mth power carrier recovery structure for MPSK","authors":"P. Y. Kam, T. Cheong","doi":"10.1109/ICICS.1997.652242","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652242","url":null,"abstract":"An approximate, linearized analysis for the phase error probability density function (PDF) for the Mth power carrier recovery structure under the additive white Gaussian noise (AWGN) channel with constant unknown carrier phase and random-walk carrier phase channel models are presented. From the analysis, the optimum receiver parameters for a given channel condition can then be obtained analytically. With the analysis for the phase error PDF, the bit error rate (BER) can be determined analytically.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"328 1","pages":"1496-1500 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76547584","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652055
J. Friedrich, D. Schlegel
This paper compares three different methods for controlling data flow over high speed wide area networks. It presents a novel mechanism that measures the exact receiver capabilities in order to improve the rate based flow control algorithm. Unlike standard protocols like TCP/IP with their credit based flow control, the new protocol, dynamic speed transfer protocol (DSTP), uses this special rate based scheme. With additional optimization, the protocol is able to reach both, high transmission speed and a nearly optimal usage of bandwidth.
{"title":"End-to-end flow control algorithms for high speed data transmission over ATM","authors":"J. Friedrich, D. Schlegel","doi":"10.1109/ICICS.1997.652055","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652055","url":null,"abstract":"This paper compares three different methods for controlling data flow over high speed wide area networks. It presents a novel mechanism that measures the exact receiver capabilities in order to improve the rate based flow control algorithm. Unlike standard protocols like TCP/IP with their credit based flow control, the new protocol, dynamic speed transfer protocol (DSTP), uses this special rate based scheme. With additional optimization, the protocol is able to reach both, high transmission speed and a nearly optimal usage of bandwidth.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"82 3 1","pages":"640-643 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79745969","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652221
M. Jian, A. Kot, M.H. Er
An improved time delay estimator based on the symmetry measurement of the generalised cross-correlation (GCC) function is proposed. At a strong reverberation case, multiple peaks are chosen from the GCC function and the peak with the best symmetry measure is determined as the time delay estimate. Computer simulation results in a room environment for different source locations show the significant improvement on the percentage of anomalies of the time delay estimates against the maximum likelihood TDE (MLTDE) and PHAT methods, it also shows that the proposed time delay estimation is robust to the presence of multi-path propagation, even under a strong reverberation condition and with the source located close to the wall.
{"title":"Time delay estimation at multi-path based on symmetry measure of GCC function","authors":"M. Jian, A. Kot, M.H. Er","doi":"10.1109/ICICS.1997.652221","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652221","url":null,"abstract":"An improved time delay estimator based on the symmetry measurement of the generalised cross-correlation (GCC) function is proposed. At a strong reverberation case, multiple peaks are chosen from the GCC function and the peak with the best symmetry measure is determined as the time delay estimate. Computer simulation results in a room environment for different source locations show the significant improvement on the percentage of anomalies of the time delay estimates against the maximum likelihood TDE (MLTDE) and PHAT methods, it also shows that the proposed time delay estimation is robust to the presence of multi-path propagation, even under a strong reverberation condition and with the source located close to the wall.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"230 1","pages":"1401-1404 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80251075","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.647142
P. Hoole, R.W.A. Rathninda, B. Mageswaran, P. Sivaprakasapillai, Cheong Chee Hoo
The relative phase of the electronic signals radiated by communication and radar systems contain sufficient information regarding the state of the systems. For instance, the changes in a 16-QAM constellation of digital communication systems may indicate the fault source in the system. The use of a feedforward artificial neural network (ANN) in conjunction with the Hough transform (HT) to detect faults in a QAM system is demonstrated in this paper. The extension of the results to early warning instrument landing radar systems is also presented.
{"title":"Electromagnetics field based diagnostics for communication and radar systems: case studies","authors":"P. Hoole, R.W.A. Rathninda, B. Mageswaran, P. Sivaprakasapillai, Cheong Chee Hoo","doi":"10.1109/ICICS.1997.647142","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647142","url":null,"abstract":"The relative phase of the electronic signals radiated by communication and radar systems contain sufficient information regarding the state of the systems. For instance, the changes in a 16-QAM constellation of digital communication systems may indicate the fault source in the system. The use of a feedforward artificial neural network (ANN) in conjunction with the Hough transform (HT) to detect faults in a QAM system is demonstrated in this paper. The extension of the results to early warning instrument landing radar systems is also presented.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"1 1","pages":"471-474 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83014445","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}
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