Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.938152
S. Zentner, L. Šumichrast, Z. Šipuš
Propagation of soliton-like pulses in dispersion managed nonlinear fibers has been numerically modeled and the properties of propagating pulses thoroughly investigated. A split step algorithm combining the finite differences beam propagation method with nonlinear phase modulation was used for modeling of the propagation equation. The propagation of pulses in a normal as well as in an anomalous average-dispersion regime has been investigated.
{"title":"Numerical simulation of nonlinear propagation in dispersion managed fibers","authors":"S. Zentner, L. Šumichrast, Z. Šipuš","doi":"10.1109/EURCON.2001.938152","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938152","url":null,"abstract":"Propagation of soliton-like pulses in dispersion managed nonlinear fibers has been numerically modeled and the properties of propagating pulses thoroughly investigated. A split step algorithm combining the finite differences beam propagation method with nonlinear phase modulation was used for modeling of the propagation equation. The propagation of pulses in a normal as well as in an anomalous average-dispersion regime has been investigated.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116750456","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 : 2001-07-04DOI: 10.1109/EURCON.2001.938179
N. Maloku, M. Frey-Pucko
Generation of test cases from a protocol specification for the purposes of testing both control and data flow aspects of a protocol implementation is a challenging problem. We propose an approach for protocols based on extended finite state machine (EFSM) models. Basically, we use the method of H. Ural and A. Williams (see Formal Description Techniques, vol.VI no.C-22, p.335-50, 1994). We extend the method to deal with more than one SDL process. The use of the improved method upgraded with simulation feasibility checking is illustrated by a practical example of test case generation for V5.2 startup procedure that involves the CTRL (control) and LNK (link) protocols with appropriate processes.
{"title":"SDL-based feasible test generation for communication protocols","authors":"N. Maloku, M. Frey-Pucko","doi":"10.1109/EURCON.2001.938179","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938179","url":null,"abstract":"Generation of test cases from a protocol specification for the purposes of testing both control and data flow aspects of a protocol implementation is a challenging problem. We propose an approach for protocols based on extended finite state machine (EFSM) models. Basically, we use the method of H. Ural and A. Williams (see Formal Description Techniques, vol.VI no.C-22, p.335-50, 1994). We extend the method to deal with more than one SDL process. The use of the improved method upgraded with simulation feasibility checking is illustrated by a practical example of test case generation for V5.2 startup procedure that involves the CTRL (control) and LNK (link) protocols with appropriate processes.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126615007","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 : 2001-07-04DOI: 10.1109/EURCON.2001.938133
D. Bajić, V. Šenk, M. Despotovic, D. Drajic
The frame-alignment monitoring schemes for STM-1 frames can be based upon the tests of synchronization word that is a subset of the complete framing signal. This paper deals with some particularities that can arise when implementing such a solution.
{"title":"Short STM-1 framing structures","authors":"D. Bajić, V. Šenk, M. Despotovic, D. Drajic","doi":"10.1109/EURCON.2001.938133","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938133","url":null,"abstract":"The frame-alignment monitoring schemes for STM-1 frames can be based upon the tests of synchronization word that is a subset of the complete framing signal. This paper deals with some particularities that can arise when implementing such a solution.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128477099","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 : 2001-07-04DOI: 10.1109/EURCON.2001.937783
J. Dospisil, T. Polgar
The importance of automated negotiation systems is increasing with the emergence of new technologies supporting faster reasoning engines and mobile code. One form of commerce that could benefit from automation is contracting. A broad variety of negotiation protocols has evolved in traditional markets. However, the primary focus of current research is on automation and the extension of these protocols. We argue that one fundamental question has been neglected: how to match the negotiation strategy and protocol to electronic markets. This paper briefly explores current concepts and directions in negotiation and collaboration strategies in multi agent systems. The paper concentrates on improving mobile constraint agents' ability to locate and utilize a suitable negotiation protocol. We present the service discovery framework which enables the agent to browse the network and locate a constraint solver with characteristics matching the scheduling problem at hand.
{"title":"Constraint agents can negotiate","authors":"J. Dospisil, T. Polgar","doi":"10.1109/EURCON.2001.937783","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937783","url":null,"abstract":"The importance of automated negotiation systems is increasing with the emergence of new technologies supporting faster reasoning engines and mobile code. One form of commerce that could benefit from automation is contracting. A broad variety of negotiation protocols has evolved in traditional markets. However, the primary focus of current research is on automation and the extension of these protocols. We argue that one fundamental question has been neglected: how to match the negotiation strategy and protocol to electronic markets. This paper briefly explores current concepts and directions in negotiation and collaboration strategies in multi agent systems. The paper concentrates on improving mobile constraint agents' ability to locate and utilize a suitable negotiation protocol. We present the service discovery framework which enables the agent to browse the network and locate a constraint solver with characteristics matching the scheduling problem at hand.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130355130","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 : 2001-07-04DOI: 10.1109/EURCON.2001.938158
J. Cuchran, R. Róka
We first present a short overview of the characteristics of the access network's technologies and then focus on the comparison of metallic and optical access systems. In the final part, we place the emphasis on the presentation of the evolutionary deployment of optical access networks, concretely on the utilization of the FTTH/VDSL combination in the local access network.
{"title":"The evolution of the access network's infrastructure for the expansion of new broadband services and applications","authors":"J. Cuchran, R. Róka","doi":"10.1109/EURCON.2001.938158","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938158","url":null,"abstract":"We first present a short overview of the characteristics of the access network's technologies and then focus on the comparison of metallic and optical access systems. In the final part, we place the emphasis on the presentation of the evolutionary deployment of optical access networks, concretely on the utilization of the FTTH/VDSL combination in the local access network.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134161975","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 : 2001-07-04DOI: 10.1109/EURCON.2001.938156
J. Newbury
This paper considers the conditions for the transmission and reception of high-frequency data communications signals over the low-voltage distribution network. The driving force for exploiting this part of the power distribution network is examined, together with the types of services that potentially may be carried over the network. The type of problems encountered and potentially the limiting factors of providing such a service are examined. The standards being developed in the world to provide such services together with other associated organisations are considered. Recommendations for the future are also considered.
{"title":"Communications services using the low voltage power distribution network","authors":"J. Newbury","doi":"10.1109/EURCON.2001.938156","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938156","url":null,"abstract":"This paper considers the conditions for the transmission and reception of high-frequency data communications signals over the low-voltage distribution network. The driving force for exploiting this part of the power distribution network is examined, together with the types of services that potentially may be carried over the network. The type of problems encountered and potentially the limiting factors of providing such a service are examined. The standards being developed in the world to provide such services together with other associated organisations are considered. Recommendations for the future are also considered.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134165569","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 : 2001-07-04DOI: 10.1109/EURCON.2001.938160
K. El-Shennawy, M. Nasr, M. Abdelwahab
This paper presents an efficient two-digit algorithm for coding speech at low bit rates. This algorithm was suggested based on the constant factor algorithm (CFA) used in adaptive quantization. This has lend to an improvement in SNR and larger dynamic range at the expense of a small increase in the required channel bandwidth. A further improvement to the two-digit system is demonstrated by using an optimized second-order prediction which achieves a gain of 3 to 4 dB in SNR over the original first-order system. Moreover a two-digit speech coder with an incremental step size adaptation algorithm is proposed to benefit from the advantages of simple and efficient speech encoders using incremental step size adaptation such as the Song Voice Incremental Algorithm (SVIA).
{"title":"On improving the performance of a two-digit encoding scheme using a modified predictor","authors":"K. El-Shennawy, M. Nasr, M. Abdelwahab","doi":"10.1109/EURCON.2001.938160","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938160","url":null,"abstract":"This paper presents an efficient two-digit algorithm for coding speech at low bit rates. This algorithm was suggested based on the constant factor algorithm (CFA) used in adaptive quantization. This has lend to an improvement in SNR and larger dynamic range at the expense of a small increase in the required channel bandwidth. A further improvement to the two-digit system is demonstrated by using an optimized second-order prediction which achieves a gain of 3 to 4 dB in SNR over the original first-order system. Moreover a two-digit speech coder with an incremental step size adaptation algorithm is proposed to benefit from the advantages of simple and efficient speech encoders using incremental step size adaptation such as the Song Voice Incremental Algorithm (SVIA).","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"54 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120892684","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 : 2001-07-04DOI: 10.1109/EURCON.2001.938132
W. Pogribny, I. Rozhankivsky, V. Lozynsky
Methods of matching digital filtering of noise-like signals for synchronisation of communications systems are studied. To increase the efficiency of the differential processing of such signals in the time domain, the use of a noise-like signal representation in sign delta modulation format (SignDM) has been proposed. The SignDM codes are determined by the values of differences between signal samples in PCM formats with a differential zone, which is defined a priori. These codes belong to the set {-1,0,1}. SignDM's sampling rate is equal to the Nyquist frequency. The resolution of matching filtering depending on the changing of the differential zone is studied by computer simulations. The peculiarities of creating analog signals on the basis of the noise-like codes have been presented, too. The structure of the matching filter (MF) with SignDM is discussed, too.
{"title":"Differential filtration of noise-like signals for synchronization tasks","authors":"W. Pogribny, I. Rozhankivsky, V. Lozynsky","doi":"10.1109/EURCON.2001.938132","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938132","url":null,"abstract":"Methods of matching digital filtering of noise-like signals for synchronisation of communications systems are studied. To increase the efficiency of the differential processing of such signals in the time domain, the use of a noise-like signal representation in sign delta modulation format (SignDM) has been proposed. The SignDM codes are determined by the values of differences between signal samples in PCM formats with a differential zone, which is defined a priori. These codes belong to the set {-1,0,1}. SignDM's sampling rate is equal to the Nyquist frequency. The resolution of matching filtering depending on the changing of the differential zone is studied by computer simulations. The peculiarities of creating analog signals on the basis of the noise-like codes have been presented, too. The structure of the matching filter (MF) with SignDM is discussed, too.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117166826","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 : 2001-07-04DOI: 10.1109/EURCON.2001.937775
M. Verderber, A. Zemva, A. Trost
We demonstrate the feasibility of exploiting FPGA devices for implementation of a computing-intensive algorithm for edge detection which is one of the earliest steps in image processing. We have developed a modular FPGA-based prototyping system composed of five Xilinx Spartan FPGA devices. The purpose of the system is to evaluate various image processing algorithms implemented in hardware. We have already implemented the edge detection algorithm on the basis of the inverse discrete Fourier transform (IDFT). We have first performed a discrete Fourier transform (DFT) on the input images, multiplying the samples with high-pass filter followed by the IDFT to obtain the image with detected edges. The whole algorithm is performed in a real-time. We have compared the efficiency of the algorithm versus the software implementation on the PC.
{"title":"Implementation of IDFT algorithm","authors":"M. Verderber, A. Zemva, A. Trost","doi":"10.1109/EURCON.2001.937775","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937775","url":null,"abstract":"We demonstrate the feasibility of exploiting FPGA devices for implementation of a computing-intensive algorithm for edge detection which is one of the earliest steps in image processing. We have developed a modular FPGA-based prototyping system composed of five Xilinx Spartan FPGA devices. The purpose of the system is to evaluate various image processing algorithms implemented in hardware. We have already implemented the edge detection algorithm on the basis of the inverse discrete Fourier transform (IDFT). We have first performed a discrete Fourier transform (DFT) on the input images, multiplying the samples with high-pass filter followed by the IDFT to obtain the image with detected edges. The whole algorithm is performed in a real-time. We have compared the efficiency of the algorithm versus the software implementation on the PC.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114768512","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 : 2001-07-04DOI: 10.1109/EURCON.2001.938112
A. Veglis, E. Avraam
In the last ten years, there has been considerable interest in the educational applications of electronic networking. The use of the WWW has been adopted into every aspect of educational life. The academic community supports the use of the Web as a tool to enhance teaching and learning. The problem is that the implementation of Web courses is not an easy task. This paper presents the available tools for developing Web courses and proposes an alternative approach. The implementation of Web courses for teaching trainee teachers in a supplementary teacher education course is also presented and discussed.
{"title":"Using the Web in supplementary teacher education","authors":"A. Veglis, E. Avraam","doi":"10.1109/EURCON.2001.938112","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938112","url":null,"abstract":"In the last ten years, there has been considerable interest in the educational applications of electronic networking. The use of the WWW has been adopted into every aspect of educational life. The academic community supports the use of the Web as a tool to enhance teaching and learning. The problem is that the implementation of Web courses is not an easy task. This paper presents the available tools for developing Web courses and proposes an alternative approach. The implementation of Web courses for teaching trainee teachers in a supplementary teacher education course is also presented and discussed.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116920205","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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