Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.938146
M. Hurton
The article deals with the problem of agent identification and authentication in distributed systems. It claims that solutions known and employed today violate the principle of limited knowledge and limited control; and therefore impose undue limits to system evolution. To propose a solution, the article first examines the concept of object, agent, model and model space. These are later used to explore and justify the phenomena of agent identification and authentication.
{"title":"Identification and authentication in distributed systems","authors":"M. Hurton","doi":"10.1109/EURCON.2001.938146","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938146","url":null,"abstract":"The article deals with the problem of agent identification and authentication in distributed systems. It claims that solutions known and employed today violate the principle of limited knowledge and limited control; and therefore impose undue limits to system evolution. To propose a solution, the article first examines the concept of object, agent, model and model space. These are later used to explore and justify the phenomena of agent identification and authentication.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"21 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":"117006417","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.2001.937762
A. Abouaissa, L. Amanton, P. Lorenz
We propose a new algorithm for guaranteed bandwidth routing. The problem is motivated by the needs of service providers to set-up bandwidth guaranteed paths quickly in their backbone or transport networks. For that, one way to provide a routing bandwidth is to use MPLS (multiprotocol label switching). An important context in which these problems arise is that of a dynamic label switched path (LSP) set up in MPLS between ingress and egress nodes. The routes of the LSPs can be specified explicitly. In addition, with the establishment of backup LSPs, a network will be able to cope with failure in nodes and links.
{"title":"An oriented diffusion algorithm for routing paths in MPLS network","authors":"A. Abouaissa, L. Amanton, P. Lorenz","doi":"10.1109/EURCON.2001.937762","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937762","url":null,"abstract":"We propose a new algorithm for guaranteed bandwidth routing. The problem is motivated by the needs of service providers to set-up bandwidth guaranteed paths quickly in their backbone or transport networks. For that, one way to provide a routing bandwidth is to use MPLS (multiprotocol label switching). An important context in which these problems arise is that of a dynamic label switched path (LSP) set up in MPLS between ingress and egress nodes. The routes of the LSPs can be specified explicitly. In addition, with the establishment of backup LSPs, a network will be able to cope with failure in nodes and links.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"416 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":"117313480","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.2001.938130
A. Lenaghan, A. Schiefer, R. Malyan, M. Colbert
We present an analysis of the needs of groups of individuals for positioning information using mobile multimedia terminals for accessing location-based information. We consider first a simple framework relating the needs of individuals and groups to information about the location of other group members. The concept of a layered service for delivering position-dependent information to mobile devices is discussed. We present the results of a study which found that people felt that organizing successful rendezvous was problematic but that this could be assisted by a suitably designed mobile positioning service. We introduce the main features of an implementation addressing the provision of position-sensitive groupware services.
{"title":"Position aware group information services","authors":"A. Lenaghan, A. Schiefer, R. Malyan, M. Colbert","doi":"10.1109/EURCON.2001.938130","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938130","url":null,"abstract":"We present an analysis of the needs of groups of individuals for positioning information using mobile multimedia terminals for accessing location-based information. We consider first a simple framework relating the needs of individuals and groups to information about the location of other group members. The concept of a layered service for delivering position-dependent information to mobile devices is discussed. We present the results of a study which found that people felt that organizing successful rendezvous was problematic but that this could be assisted by a suitably designed mobile positioning service. We introduce the main features of an implementation addressing the provision of position-sensitive groupware services.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"20 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":"130297450","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.2001.938174
H. Amindavar, M. Tabibian
A perturbative blind channel equalization method is introduced. It is shown that through the use of perturbation analysis, both the channel and input signal can be obtained blindly in the presence of noise. The basic idea behind this development is the modelling of the received data sequence as an autoregressive moving average process and performing perturbation of a analysis over the power spectral density. Although the new approach is derived based on second order properties it can restore the channel phase even in low signal-to-noise ratios.
{"title":"An perturbational blind channel and signal estimation","authors":"H. Amindavar, M. Tabibian","doi":"10.1109/EURCON.2001.938174","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938174","url":null,"abstract":"A perturbative blind channel equalization method is introduced. It is shown that through the use of perturbation analysis, both the channel and input signal can be obtained blindly in the presence of noise. The basic idea behind this development is the modelling of the received data sequence as an autoregressive moving average process and performing perturbation of a analysis over the power spectral density. Although the new approach is derived based on second order properties it can restore the channel phase even in low signal-to-noise ratios.","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":"129221252","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.2001.938137
M. Caramma, M. Fumagalli, R. Lancini
When transmitting data over heterogeneous networks, there may be situations which necessitate dropping packets, for example, to accommodate a lower capacity or when congestion occurs. If retransmission of the lost packets is not feasible (e.g. for real time applications), we have to design a decoder able to recover significant information from the received packets. The literature suggests resolving this issue by using generalized multiple description coding (GMDC): it is source coding for multiple channels such that a decoder, which receives an arbitrary subset of the channels, may produce a useful reconstruction. In this work, we present a multiple description (MD) system based on a polyphase downsampling algorithm that splits an image source into an arbitrary number of balanced descriptions. Our goal is to obtain both the best reconstruction quality from the received descriptions (also only one) and a subjective indistinguishable reconstruction from the original if all the descriptions are available. Our specific interest is the communication of still images, but we think that our method is advantageous in other application such as video and audio.
{"title":"Video coding for IP transmission by using polyphase downsampling multiple description","authors":"M. Caramma, M. Fumagalli, R. Lancini","doi":"10.1109/EURCON.2001.938137","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938137","url":null,"abstract":"When transmitting data over heterogeneous networks, there may be situations which necessitate dropping packets, for example, to accommodate a lower capacity or when congestion occurs. If retransmission of the lost packets is not feasible (e.g. for real time applications), we have to design a decoder able to recover significant information from the received packets. The literature suggests resolving this issue by using generalized multiple description coding (GMDC): it is source coding for multiple channels such that a decoder, which receives an arbitrary subset of the channels, may produce a useful reconstruction. In this work, we present a multiple description (MD) system based on a polyphase downsampling algorithm that splits an image source into an arbitrary number of balanced descriptions. Our goal is to obtain both the best reconstruction quality from the received descriptions (also only one) and a subjective indistinguishable reconstruction from the original if all the descriptions are available. Our specific interest is the communication of still images, but we think that our method is advantageous in other application such as video and audio.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"418 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":"121594628","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.2001.938157
T. Kos, B. Zovko-Cihlar, S. Grgić
Traditional CATV networks are growing into two-way multimedia networks. In recent years cable providers are trying to offer multiple services over a single network. Internet access, high-speed data transfer, video on demand, and games are some of the applications driving this trend. The problem of delivering new services over CATV networks is characterised by certain infrastructure investments, and the possibilities of upgrading existing CATV networks analysed. The article describes the development of techniques and technologies applied in modern two-way interactive CATV systems.
{"title":"New services over CATV network","authors":"T. Kos, B. Zovko-Cihlar, S. Grgić","doi":"10.1109/EURCON.2001.938157","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938157","url":null,"abstract":"Traditional CATV networks are growing into two-way multimedia networks. In recent years cable providers are trying to offer multiple services over a single network. Internet access, high-speed data transfer, video on demand, and games are some of the applications driving this trend. The problem of delivering new services over CATV networks is characterised by certain infrastructure investments, and the possibilities of upgrading existing CATV networks analysed. The article describes the development of techniques and technologies applied in modern two-way interactive CATV systems.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"37 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":"115793241","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.2001.938151
T. Pesic, J. Karamarković, N. Jankovic
The method of modeling all injection level minority carrier transport in the arbitrarily doped base quasi-neutral region of bipolar transistors by the equivalent inhomogeneous lossy transmission line (TL) is summarized. Contrary to presently available all injection level collector current models, our TL method is more general since it includes both the Webster and Kirk effects. It was found that the Kirk effect significantly influences base minority-carrier transport in the medium- as well as high-level injection region, and by no means can be neglected in modeling high-injection effects. The accuracy of the TL model is accessed by comparing collector currents calculated by the TL model with those obtained by a standard ID numerical simulator (SEDAN) and by experimental data.
{"title":"All injection level transmission line model of minority-carrier transport","authors":"T. Pesic, J. Karamarković, N. Jankovic","doi":"10.1109/EURCON.2001.938151","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938151","url":null,"abstract":"The method of modeling all injection level minority carrier transport in the arbitrarily doped base quasi-neutral region of bipolar transistors by the equivalent inhomogeneous lossy transmission line (TL) is summarized. Contrary to presently available all injection level collector current models, our TL method is more general since it includes both the Webster and Kirk effects. It was found that the Kirk effect significantly influences base minority-carrier transport in the medium- as well as high-level injection region, and by no means can be neglected in modeling high-injection effects. The accuracy of the TL model is accessed by comparing collector currents calculated by the TL model with those obtained by a standard ID numerical simulator (SEDAN) and by experimental data.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"45 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":"115977296","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.2001.937785
M. Tabibian, H. Amindavar
This paper describes an e-commerce solution for a complete selling transaction on the Internet. We approach the subject not only from the technical point of view but also from its business aspects. Implementing such a service requires an integrated banking system to support money transactions, which involves a modern banking system. In this paper we do not handle the problems with such a system but assume it is available and working properly.
{"title":"E-commerce: technical and market approach","authors":"M. Tabibian, H. Amindavar","doi":"10.1109/EURCON.2001.937785","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937785","url":null,"abstract":"This paper describes an e-commerce solution for a complete selling transaction on the Internet. We approach the subject not only from the technical point of view but also from its business aspects. Implementing such a service requires an integrated banking system to support money transactions, which involves a modern banking system. In this paper we do not handle the problems with such a system but assume it is available and working properly.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"33 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":"134031806","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.2001.938166
Z. Kang, A. Agarwal
For supporting the available bit rate (ABR) service in ATM networks, existing feedback-based rate control schemes mostly employ a single static buffer threshold at each switching node as the forewarning of congestion. EFCI is one of the simplest ABR congestion control mechanisms. An enhanced explicit forward congestion indication (E-EFCI) congestion control algorithm is proposed. The results and analysis of computer simulation using the E-EFCI congestion control algorithm by selecting the control parameters properly show that the end-to-end delay of ABR service is smaller and the link utilization is higher than those using EFCI congestion control algorithm.
{"title":"Analysis of end-to-end delay based on enhanced-EFCI congestion control algorithm for ABR service","authors":"Z. Kang, A. Agarwal","doi":"10.1109/EURCON.2001.938166","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938166","url":null,"abstract":"For supporting the available bit rate (ABR) service in ATM networks, existing feedback-based rate control schemes mostly employ a single static buffer threshold at each switching node as the forewarning of congestion. EFCI is one of the simplest ABR congestion control mechanisms. An enhanced explicit forward congestion indication (E-EFCI) congestion control algorithm is proposed. The results and analysis of computer simulation using the E-EFCI congestion control algorithm by selecting the control parameters properly show that the end-to-end delay of ABR service is smaller and the link utilization is higher than those using EFCI congestion control algorithm.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"17 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":"131019418","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.2001.937799
S. Vougioukas, M. Roumeliotis
This work describes the design and implementation of a distributed system which uses the wireless GSM short message service (SMS) data transfer technology to give network managers access to services on remote network equipment via a cellular phone. Existing work has been restricted to simple network monitoring, i.e. one way transmission of alert messages from network monitoring application to designated mobile phones, through a GSM modem connected to the computer hosting the monitoring application. In our work, we develop a multi-user, multi-session, two-way network management system via SMS. First, we present the SMS mechanism and discuss its features and restrictions. Then, we analyze the requirements of our system, and present a design of distributed architecture for it. Next we present in detail our implementation of the proposed system, based on Java servlet technology. Finally, we report our experiences with using it, and propose directions for future work.
{"title":"A system for basic-level network fault management based on the GSM short message service (SMS)","authors":"S. Vougioukas, M. Roumeliotis","doi":"10.1109/EURCON.2001.937799","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937799","url":null,"abstract":"This work describes the design and implementation of a distributed system which uses the wireless GSM short message service (SMS) data transfer technology to give network managers access to services on remote network equipment via a cellular phone. Existing work has been restricted to simple network monitoring, i.e. one way transmission of alert messages from network monitoring application to designated mobile phones, through a GSM modem connected to the computer hosting the monitoring application. In our work, we develop a multi-user, multi-session, two-way network management system via SMS. First, we present the SMS mechanism and discuss its features and restrictions. Then, we analyze the requirements of our system, and present a design of distributed architecture for it. Next we present in detail our implementation of the proposed system, based on Java servlet technology. Finally, we report our experiences with using it, and propose directions for future work.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"18 4 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":"130920777","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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