Pub Date : 2003-10-15DOI: 10.1109/TENCON.2003.1273368
M. Mitra, N.B. Singh
An efficient general-purpose optimizer based on "genetic algorithms" has been developed. The efficacy of the optimizer has been well demonstrated by implementing it for parameter extraction of pn junction diodes. With this technique, device parameters like built-in potential and grading coefficient for any diode can be extracted. If the grading coefficient shows the junction to be linear graded, effective diode area and doping gradient have been extracted. If the junction turns out to be an abrupt one, effective area and doping concentrations of each side have been obtained. It is also possible to obtain process parameters for other kinds of junctions with the inclusion of suitable models. This parameter extraction technique has been applied successfully to measured data for real diodes as well as simulated data with different noise levels.
{"title":"Study of pn junctions using genetic algorithm optimizer","authors":"M. Mitra, N.B. Singh","doi":"10.1109/TENCON.2003.1273368","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273368","url":null,"abstract":"An efficient general-purpose optimizer based on \"genetic algorithms\" has been developed. The efficacy of the optimizer has been well demonstrated by implementing it for parameter extraction of pn junction diodes. With this technique, device parameters like built-in potential and grading coefficient for any diode can be extracted. If the grading coefficient shows the junction to be linear graded, effective diode area and doping gradient have been extracted. If the junction turns out to be an abrupt one, effective area and doping concentrations of each side have been obtained. It is also possible to obtain process parameters for other kinds of junctions with the inclusion of suitable models. This parameter extraction technique has been applied successfully to measured data for real diodes as well as simulated data with different noise levels.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"685 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133132674","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273246
M. Meshram, N. K. Agrawal, B. Sinha, P. S. Misra
We present the development and design analysis of a multi layer microwave absorber. Three samples of M type hexagonal ferrite powders, namely [Ba(MnTi)/sub /spl delta//Fe/sub (12-2/spl delta/)/O/sub 19/] for /spl delta/ = 1.6, 1.7 and 1.8, have been developed using the dry attrition and sintering process. On the basis of the transmission line model, the microwave absorption for a three layer microwave absorber with different combinations of ferrite for an overall coating thickness of 1.5 mm have been computed. It has been found that the three layer microwave absorber with each layer of different composition provides broad band characteristics with a minimum of 10 dB absorption from 12.5 to 18 GHz. This type of microwave absorber is very useful in military application for reducing the radar cross section of the target.
{"title":"Transmission line modeling (TLM) for evaluation of absorption in ferrite based multi layer microwave absorber","authors":"M. Meshram, N. K. Agrawal, B. Sinha, P. S. Misra","doi":"10.1109/TENCON.2003.1273246","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273246","url":null,"abstract":"We present the development and design analysis of a multi layer microwave absorber. Three samples of M type hexagonal ferrite powders, namely [Ba(MnTi)/sub /spl delta//Fe/sub (12-2/spl delta/)/O/sub 19/] for /spl delta/ = 1.6, 1.7 and 1.8, have been developed using the dry attrition and sintering process. On the basis of the transmission line model, the microwave absorption for a three layer microwave absorber with different combinations of ferrite for an overall coating thickness of 1.5 mm have been computed. It has been found that the three layer microwave absorber with each layer of different composition provides broad band characteristics with a minimum of 10 dB absorption from 12.5 to 18 GHz. This type of microwave absorber is very useful in military application for reducing the radar cross section of the target.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130357150","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273257
H. Kang, S. Cho
In this paper, a space-time successive interference cancellation (ST-SIC) scheme equipped with multiple transceiver antennas for direct-sequence code division multiple access (DS-CDMA) communications is presented. The performance of the scheme is analytically examined in a Rayleigh fading channel. It is observed that our analytical results agree well with the empirical results. The validity and usefulness of the ST-SIC scheme are also demonstrated by computer simulations.
{"title":"Space-time SIC multiuser detection algorithm and its performance in Rayleigh fading channel","authors":"H. Kang, S. Cho","doi":"10.1109/TENCON.2003.1273257","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273257","url":null,"abstract":"In this paper, a space-time successive interference cancellation (ST-SIC) scheme equipped with multiple transceiver antennas for direct-sequence code division multiple access (DS-CDMA) communications is presented. The performance of the scheme is analytically examined in a Rayleigh fading channel. It is observed that our analytical results agree well with the empirical results. The validity and usefulness of the ST-SIC scheme are also demonstrated by computer simulations.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114580933","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273269
G. Das, R. K. Ghosh, H. Mohanty, S. Gurumurthy
We propose a retrieval model for news-based information contents over the WWW. We have integrated Web-tickers with a navigation browser. It works as an adaptable dynamic information retrieval tool embedded with the browser for Web navigation. The system has been implemented using both mobile and static agents, but provides inter-operability between the agents and the conventional request-response environment.
{"title":"Web-ticker: an adaptable news-based information retrieval tool for Web navigator","authors":"G. Das, R. K. Ghosh, H. Mohanty, S. Gurumurthy","doi":"10.1109/TENCON.2003.1273269","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273269","url":null,"abstract":"We propose a retrieval model for news-based information contents over the WWW. We have integrated Web-tickers with a navigation browser. It works as an adaptable dynamic information retrieval tool embedded with the browser for Web navigation. The system has been implemented using both mobile and static agents, but provides inter-operability between the agents and the conventional request-response environment.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116970341","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273397
A. Singh, I. Sen
This paper describes the design of a fuzzy logic based controller to counter the small signal oscillatory instability in power systems. The stabilizing signal is computed in real time using suitable fuzzy membership functions depending upon the state of the generator on the speed-acceleration phase plane. The use of output membership function permits further fine tuning of the controller parameters for varied system configurations specially in multimachine environment. The efficacy of the proposed stabilizing technique has been demonstrated using multi-machine computer simulation model of power system under a wide range of system and test conditions.
{"title":"A novel fuzzy logic based power system stabilizer for a multimachine system","authors":"A. Singh, I. Sen","doi":"10.1109/TENCON.2003.1273397","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273397","url":null,"abstract":"This paper describes the design of a fuzzy logic based controller to counter the small signal oscillatory instability in power systems. The stabilizing signal is computed in real time using suitable fuzzy membership functions depending upon the state of the generator on the speed-acceleration phase plane. The use of output membership function permits further fine tuning of the controller parameters for varied system configurations specially in multimachine environment. The efficacy of the proposed stabilizing technique has been demonstrated using multi-machine computer simulation model of power system under a wide range of system and test conditions.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117157819","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273307
R. Vishwakarma
In software engineering, scattered, interacting and crosscutting requirements are called concerns. Concern for the multidimensional separation of concerns exists right through the software development life cycle. A software process must have an ability to detect and handle different concerns in an independent way. Benefits associated include simple code (shorter and more understandable), higher flexibility, extendibility, reusability of concerns in a component, and better maintainability. We need techniques, patterns and a process model to address the problem of multidimensional separation. The paper captures real time controls in structured system analysis to identify, analyse and program the concerns. It further describes a three-dimensional frustum model and a cubical process model to implement aspects for realising concerns.
{"title":"Real time structured analysis and software process for multidimensional separation of concerns","authors":"R. Vishwakarma","doi":"10.1109/TENCON.2003.1273307","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273307","url":null,"abstract":"In software engineering, scattered, interacting and crosscutting requirements are called concerns. Concern for the multidimensional separation of concerns exists right through the software development life cycle. A software process must have an ability to detect and handle different concerns in an independent way. Benefits associated include simple code (shorter and more understandable), higher flexibility, extendibility, reusability of concerns in a component, and better maintainability. We need techniques, patterns and a process model to address the problem of multidimensional separation. The paper captures real time controls in structured system analysis to identify, analyse and program the concerns. It further describes a three-dimensional frustum model and a cubical process model to implement aspects for realising concerns.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115771231","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273327
Li Jianlin, Hua Changsheng, Wang Liqiao, Z. Zhongchao
A multilevel voltage source cascade converter (ML-VSCC) using a carrier phase-shifted SPWM (CPS-SPWM) technique has been proposed. Compared with the traditional multi-level converter, this kind of converter utilizes fewer power switches and has a balance load, a good linearity between input and output and a perfect control feature. A novel modulation strategy for ML-VSCC, sample time staggered space vector modulation (STS-SVM), is adopted. The equivalent switching frequency is improved and the harmonic component is greatly decreased under this technique. An active power filter with this technique has been simulated. It can be verified that this technique is very promising.
{"title":"APF based on multilevel voltage source cascade converter with carrier phase shifted SPWM [active power filter]","authors":"Li Jianlin, Hua Changsheng, Wang Liqiao, Z. Zhongchao","doi":"10.1109/TENCON.2003.1273327","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273327","url":null,"abstract":"A multilevel voltage source cascade converter (ML-VSCC) using a carrier phase-shifted SPWM (CPS-SPWM) technique has been proposed. Compared with the traditional multi-level converter, this kind of converter utilizes fewer power switches and has a balance load, a good linearity between input and output and a perfect control feature. A novel modulation strategy for ML-VSCC, sample time staggered space vector modulation (STS-SVM), is adopted. The equivalent switching frequency is improved and the harmonic component is greatly decreased under this technique. An active power filter with this technique has been simulated. It can be verified that this technique is very promising.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"84 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116256758","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273254
A. Talukder, S. Krishnan
For credit cards and ATM cards, financial institutes around the world use the classical security system. This involves the distribution of keys through asynchronous bearers in space and time, whereas for authentication the keys are used synchronously through multifactor authentication. This methodology of asynchronous and synchronous usage of split keys is considered to be very secure. Due to lack of proper technology to date, there was no electronic equivalent of the same. However, with the emerging technologies in wireless metropolitan area networks (MAN), over GSM, GPRS, or CDMA/3G, it is possible to adopt the asynchronous mode of space and time for key distribution. The paper suggests a model for combining the asynchronous mode of space and time with ideas from quantum cryptography for key distribution to have a secure communication channel for wireless metropolitan area networks.
{"title":"Asynchronous multi factor model (AMFM) of security for wireless MAN","authors":"A. Talukder, S. Krishnan","doi":"10.1109/TENCON.2003.1273254","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273254","url":null,"abstract":"For credit cards and ATM cards, financial institutes around the world use the classical security system. This involves the distribution of keys through asynchronous bearers in space and time, whereas for authentication the keys are used synchronously through multifactor authentication. This methodology of asynchronous and synchronous usage of split keys is considered to be very secure. Due to lack of proper technology to date, there was no electronic equivalent of the same. However, with the emerging technologies in wireless metropolitan area networks (MAN), over GSM, GPRS, or CDMA/3G, it is possible to adopt the asynchronous mode of space and time for key distribution. The paper suggests a model for combining the asynchronous mode of space and time with ideas from quantum cryptography for key distribution to have a secure communication channel for wireless metropolitan area networks.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115409377","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}
The development of multimedia systems, which can handle voice and video, is fast growing. Image and video capacity are the essential components of a multimedia system. Representing digital video requires large amount of data, thus, video compression is necessary. In this research composition, the H.261 video compression standard is examined and a video compression algorithm based on the said standard is implemented. Application of H.261 compression algorithms are done with efficiency in mind to provide the least compromise between the computational speed and compression ratio. To make such implementation practicable, the heart of its compression algorithm - the discrete cosine transform, quantization, and variable length coding, are analyzed carefully and fast implementations that do not considerably reduce image quality are incorporated in the codec.
{"title":"A modified video coding algorithm based on the H.261 standard","authors":"Jianming Tan, PoLin Lai, Shengnan Que, E.R. Lapira, R.T. Ricardos, K.H. Torrefranca","doi":"10.1109/TENCON.2003.1273380","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273380","url":null,"abstract":"The development of multimedia systems, which can handle voice and video, is fast growing. Image and video capacity are the essential components of a multimedia system. Representing digital video requires large amount of data, thus, video compression is necessary. In this research composition, the H.261 video compression standard is examined and a video compression algorithm based on the said standard is implemented. Application of H.261 compression algorithms are done with efficiency in mind to provide the least compromise between the computational speed and compression ratio. To make such implementation practicable, the heart of its compression algorithm - the discrete cosine transform, quantization, and variable length coding, are analyzed carefully and fast implementations that do not considerably reduce image quality are incorporated in the codec.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123506463","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 : 2003-10-15DOI: 10.1109/TENCON.2003.1273172
J. Muruganantham, R. Amarnath, K.V. Jawahar, C. Kalyanasundaram
The emergence of cardiac surgery and with it an imperative need for precise anatomical diagnosis have revived the technical advancement necessary for the amplification and recording of cardiovascular sounds. The study of phonocardiography has developed out of this confidence. The recordings of the sounds, produced by the mechanical activity of the human heart that contains vital information are called phonocardiogram and the device used to record is called phonocardiograph. The objective of this work is to find an efficient method to diagnose the heart diseases from their heart sounds. We have implemented various methods including neural network, fuzzy system and wavelets to recognize the heart diseases and their efficiencies were compared with each other.
{"title":"Methods for classification of phonocardiogram","authors":"J. Muruganantham, R. Amarnath, K.V. Jawahar, C. Kalyanasundaram","doi":"10.1109/TENCON.2003.1273172","DOIUrl":"https://doi.org/10.1109/TENCON.2003.1273172","url":null,"abstract":"The emergence of cardiac surgery and with it an imperative need for precise anatomical diagnosis have revived the technical advancement necessary for the amplification and recording of cardiovascular sounds. The study of phonocardiography has developed out of this confidence. The recordings of the sounds, produced by the mechanical activity of the human heart that contains vital information are called phonocardiogram and the device used to record is called phonocardiograph. The objective of this work is to find an efficient method to diagnose the heart diseases from their heart sounds. We have implemented various methods including neural network, fuzzy system and wavelets to recognize the heart diseases and their efficiencies were compared with each other.","PeriodicalId":405847,"journal":{"name":"TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124918871","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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