Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937771
M. Nezafat, H. Amindavar
We present a new approach to noise reduction based on mathematical morphology. The proposed algorithm performs an adaptive, nonlinear, and recursive filtering. The results show that a deterministic or a stochastic signal corrupted by an additive noise of general nature is recovered using the new nonlinear filter. The new filter is able to remove a correlated noise, or a signal-dependent noise from the desired signal. This filter is also capable of recovering desired signals even in low signal-to-noise ratios and it is versatile enough to combat heavy tail Cauchy noise. We also provide the pertinent probability density function for the output of the main part of the new filter.
{"title":"A new enhanced morphological filter and signal recovery","authors":"M. Nezafat, H. Amindavar","doi":"10.1109/EURCON.2001.937771","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937771","url":null,"abstract":"We present a new approach to noise reduction based on mathematical morphology. The proposed algorithm performs an adaptive, nonlinear, and recursive filtering. The results show that a deterministic or a stochastic signal corrupted by an additive noise of general nature is recovered using the new nonlinear filter. The new filter is able to remove a correlated noise, or a signal-dependent noise from the desired signal. This filter is also capable of recovering desired signals even in low signal-to-noise ratios and it is versatile enough to combat heavy tail Cauchy noise. We also provide the pertinent probability density function for the output of the main part of the new filter.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"27 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":"126667781","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.2001.938113
I. Skuliber, S. Srbljic, I. crkvenac
Mathematical concepts often form a basis for creating more complex concepts. We address the problem of learning automata theory which is the starting point for understanding a number of natural and technical sciences. Mathematical abstractions used for defining and describing entities of automata theory and their interaction can present an uncrossable obstacle in the process of learning this basic knowledge. We have created a new teaching tool, "Automata Simulator", which is meant to help students in faster and better comprehension of the basics of automata theory that pose the greatest problem in understanding state machines in general. The student is given the freedom to design an arbitrary state machine by using an intuitive graphical user interface (GUI) and operate it by interactively controlling the tool. We present the tool and describe the implementation of the tool as a standalone application and as a client-server application in the global network environment (Internet).
{"title":"Using interactivity in computer-facilitated learning for efficient comprehension of mathematical abstractions","authors":"I. Skuliber, S. Srbljic, I. crkvenac","doi":"10.1109/EURCON.2001.938113","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938113","url":null,"abstract":"Mathematical concepts often form a basis for creating more complex concepts. We address the problem of learning automata theory which is the starting point for understanding a number of natural and technical sciences. Mathematical abstractions used for defining and describing entities of automata theory and their interaction can present an uncrossable obstacle in the process of learning this basic knowledge. We have created a new teaching tool, \"Automata Simulator\", which is meant to help students in faster and better comprehension of the basics of automata theory that pose the greatest problem in understanding state machines in general. The student is given the freedom to design an arbitrary state machine by using an intuitive graphical user interface (GUI) and operate it by interactively controlling the tool. We present the tool and describe the implementation of the tool as a standalone application and as a client-server application in the global network environment (Internet).","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"54 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":"115833099","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.2001.938139
M. Grgic, M. Ghanbari, S. Grgic
Texture analysis is important for many applications such as content-based image retrieval and scene analysis. In this paper, texture-based image retrieval, as one of the important parameters of the emerging MPEG-7 multimedia standard, is described. Results for similarity texture retrieval using Brodatz textures are shown.
{"title":"Texture-based image retrieval in MPEG-7 multimedia system","authors":"M. Grgic, M. Ghanbari, S. Grgic","doi":"10.1109/EURCON.2001.938139","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938139","url":null,"abstract":"Texture analysis is important for many applications such as content-based image retrieval and scene analysis. In this paper, texture-based image retrieval, as one of the important parameters of the emerging MPEG-7 multimedia standard, is described. Results for similarity texture retrieval using Brodatz textures are shown.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"81 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":"123782295","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.2001.937755
J. Sung, J. Barry
We investigate how knowledge of the channel at the transmitter can improve performance in array-to-array wireless communications. We explore the practical issues associated with space-time processing based on a singular-value decomposition (SVD) of the channel matrix. Compared to space-time block codes that do not require channel knowledge at the transmitter, the proposed method without channel coding requires 8.3 dB less SNR per antenna to achieve 6 bits/sec/Hz with 4 transmit and 4 receive antennas. Exploiting the properties of the SVD, we propose fixed bit and power allocations that avoid dynamic allocations. We also describe how reciprocity in a time-division duplex system may be exploited to simplify implementation of the SVD processing.
{"title":"Space-time processing with channel knowledge at the transmitter","authors":"J. Sung, J. Barry","doi":"10.1109/EURCON.2001.937755","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937755","url":null,"abstract":"We investigate how knowledge of the channel at the transmitter can improve performance in array-to-array wireless communications. We explore the practical issues associated with space-time processing based on a singular-value decomposition (SVD) of the channel matrix. Compared to space-time block codes that do not require channel knowledge at the transmitter, the proposed method without channel coding requires 8.3 dB less SNR per antenna to achieve 6 bits/sec/Hz with 4 transmit and 4 receive antennas. Exploiting the properties of the SVD, we propose fixed bit and power allocations that avoid dynamic allocations. We also describe how reciprocity in a time-division duplex system may be exploited to simplify implementation of the SVD processing.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"19 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":"121393885","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.2001.938128
B.U. Zejak, I. Simic, A. Zejak
Pulse compression theory and techniques were developed originally for radar systems but could be carefully adopted for ultrasound-specific problems. In past ten years a considerable amount of research has been done in the area of mismatched filtering for the purpose of its application in ultrasound. However, in a similar way to radar systems for distributed targets, pulse compression has not achieved a success of penetration in commercially available systems.
{"title":"Matched and mismatched pulse compression in medical ultrasound imaging","authors":"B.U. Zejak, I. Simic, A. Zejak","doi":"10.1109/EURCON.2001.938128","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938128","url":null,"abstract":"Pulse compression theory and techniques were developed originally for radar systems but could be carefully adopted for ultrasound-specific problems. In past ten years a considerable amount of research has been done in the area of mismatched filtering for the purpose of its application in ultrasound. However, in a similar way to radar systems for distributed targets, pulse compression has not achieved a success of penetration in commercially available systems.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"10 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":"132649168","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.2001.938141
R. Lukac, S. Marchevsky
This paper deals with impulse noise suppression from noised color sequences by three-dimensional (3D) component-wise threshold LUM (lower-upper-middle) smoothers. The proposed threshold LUM smoothers are distinguished by a best balance between impulse noise suppression and signal-detail preservation, since the smoothing level is adaptively chosen depending on local neighborhood information. In color image filtering, threshold LUM smoothers produce an output with minimal color distortion. Another property of threshold LUM smoothers that must be mentioned is their convergence to qualitative root signals that present a very low deviation from the original. Thus, a filtering process performed by threshold LUM smoothers approaches an optimal situation, where the noise free samples are passed to the output without change whereas corrupted samples are estimated as the most appropriate value from a set of possible outputs of standard LUM smoothers.
{"title":"The use of threshold LUM smoothers in noised color sequences","authors":"R. Lukac, S. Marchevsky","doi":"10.1109/EURCON.2001.938141","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938141","url":null,"abstract":"This paper deals with impulse noise suppression from noised color sequences by three-dimensional (3D) component-wise threshold LUM (lower-upper-middle) smoothers. The proposed threshold LUM smoothers are distinguished by a best balance between impulse noise suppression and signal-detail preservation, since the smoothing level is adaptively chosen depending on local neighborhood information. In color image filtering, threshold LUM smoothers produce an output with minimal color distortion. Another property of threshold LUM smoothers that must be mentioned is their convergence to qualitative root signals that present a very low deviation from the original. Thus, a filtering process performed by threshold LUM smoothers approaches an optimal situation, where the noise free samples are passed to the output without change whereas corrupted samples are estimated as the most appropriate value from a set of possible outputs of standard LUM smoothers.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"8 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":"115361789","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.2001.937801
V. Mahnic, B. Klepec, N. Zabkar
Network management is an important part of business management. Router management is one component of network management. Because of its complexity, router management is often performed by a third-party. In this paper, the risks involved with such a solution are described as well as guide lines for establishing controls to mitigate these risks. Standard COBIT (control objectives for information technology) has been used for this purpose and the result has been presented in the form of an IS (information system) audit checklist. Elements of this checklist are described and conclusions given.
{"title":"IS audit checklist for router management performed by third-party","authors":"V. Mahnic, B. Klepec, N. Zabkar","doi":"10.1109/EURCON.2001.937801","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937801","url":null,"abstract":"Network management is an important part of business management. Router management is one component of network management. Because of its complexity, router management is often performed by a third-party. In this paper, the risks involved with such a solution are described as well as guide lines for establishing controls to mitigate these risks. Standard COBIT (control objectives for information technology) has been used for this purpose and the result has been presented in the form of an IS (information system) audit checklist. Elements of this checklist are described and conclusions given.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"346 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":"115550767","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.2001.937778
A. Mohan
The paper proposes a system that makes it possible to use voice as a medium for communication between a mobile device and the wireless network for information retrieval from the Internet. A proxy agent approach is followed for wireless Internet access. The user is able to make his request by speaking simple sentences through the mobile device's microphone. The voice response, obtained from the proxy server, is played back using the existing device's loudspeakers. The paper tries to cover all the important components of the network that are responsible for generation of this response.
{"title":"A strategy for voice browsing in 3G wireless networks","authors":"A. Mohan","doi":"10.1109/EURCON.2001.937778","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937778","url":null,"abstract":"The paper proposes a system that makes it possible to use voice as a medium for communication between a mobile device and the wireless network for information retrieval from the Internet. A proxy agent approach is followed for wireless Internet access. The user is able to make his request by speaking simple sentences through the mobile device's microphone. The voice response, obtained from the proxy server, is played back using the existing device's loudspeakers. The paper tries to cover all the important components of the network that are responsible for generation of this response.","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":"114754984","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.2001.937784
M. Ojsteršek, U. Novak, Z. Cajic, B. Gorenjak
We have created the framework for building Web-based information systems which consists of a tool for automatic object persistence in relational mapping and of a custom XSLT (extensible stylesheet language transformations) processor that would use regular objects instead of XML documents. The benefits of using a framework are: independent design and content management, cross referencing of objects, structure inheritance, multilingual support, independence from the database management system, integration of different Web services and automatic support for multimedia information. The main benefit is shorter time for development of distributed services. Current implementation of the framework is based on RDB (relational database). The framework has been used to develop a city information system for the town of Maribor. The information is collected from organisations, companies, users of the information system, and other Internet and database servers. The information is currently used for presentation on the Internet, on infoterminals, on cable TV, and on teletext. The information system is accessible on http://www.sraka.com (WWW interface) and wap.sraka.com (WAP interface).
{"title":"How to build an E-city","authors":"M. Ojsteršek, U. Novak, Z. Cajic, B. Gorenjak","doi":"10.1109/EURCON.2001.937784","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937784","url":null,"abstract":"We have created the framework for building Web-based information systems which consists of a tool for automatic object persistence in relational mapping and of a custom XSLT (extensible stylesheet language transformations) processor that would use regular objects instead of XML documents. The benefits of using a framework are: independent design and content management, cross referencing of objects, structure inheritance, multilingual support, independence from the database management system, integration of different Web services and automatic support for multimedia information. The main benefit is shorter time for development of distributed services. Current implementation of the framework is based on RDB (relational database). The framework has been used to develop a city information system for the town of Maribor. The information is collected from organisations, companies, users of the information system, and other Internet and database servers. The information is currently used for presentation on the Internet, on infoterminals, on cable TV, and on teletext. The information system is accessible on http://www.sraka.com (WWW interface) and wap.sraka.com (WAP interface).","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"2 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":"116874803","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.2001.938177
Yulin Liu, Q. Peng
Joint transceiver optimization has received considerabIe attention very recently. Optimal FIR transmit filterbank precoders and nonlinear decision feedback receivers are derived for block-based transmissions over frequency-selective AWGN channels. The joint optimization of precoders and equalizers is based on the maximum mutual information criteria subject to fixed transmission power constraint. By adding one FIR feedback filter after the filterbank linear equalizers, we get a new result from which the precoder can also be interpreted as converting the frequency fading channel into a set of independent flat fading subchannels, and there is a direct path in each subchannel because of the feedback filter, thus the SNR of each subchannel and the maximum information rate are increased and the system has better overall BER performance while maintaining all the advantages of that in Scaglione et al., (1999). Simulation illustrates the merits of our design.
{"title":"A new method of joint filterbank precoders and decision feedback equalizers optimization over dispersive channels","authors":"Yulin Liu, Q. Peng","doi":"10.1109/EURCON.2001.938177","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938177","url":null,"abstract":"Joint transceiver optimization has received considerabIe attention very recently. Optimal FIR transmit filterbank precoders and nonlinear decision feedback receivers are derived for block-based transmissions over frequency-selective AWGN channels. The joint optimization of precoders and equalizers is based on the maximum mutual information criteria subject to fixed transmission power constraint. By adding one FIR feedback filter after the filterbank linear equalizers, we get a new result from which the precoder can also be interpreted as converting the frequency fading channel into a set of independent flat fading subchannels, and there is a direct path in each subchannel because of the feedback filter, thus the SNR of each subchannel and the maximum information rate are increased and the system has better overall BER performance while maintaining all the advantages of that in Scaglione et al., (1999). Simulation illustrates the merits of our design.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"22 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":"121586150","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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