Pub Date : 2006-04-17DOI: 10.1109/SIU.2006.1659802
F. Tokan, Nurhan Türker, T. Yildirim
Recently, artificial neural networks are widely used in medical prognosis. The goal of this work is to predict whether a patient will live at least one year after a heart attack by using neural networks as an example of prognosis. With this aim, multi layer perceptrons (MLP), radial basis function networks (RBF), probabilistic neural networks (PNN), generalized regression neural networks (GRNN) and learning vector quantization networks (LVQ) are used. To demonstrate the real performances of the networks, not only classification accuracies but also receiver operation characteristics (ROC) analysis must be investigated. For this purpose, both sensitivity-specificity values and ROC curves are evaluated for all networks
{"title":"Determination of The Neural Network Performances In The Medical Prognosis By Roc Analysis","authors":"F. Tokan, Nurhan Türker, T. Yildirim","doi":"10.1109/SIU.2006.1659802","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659802","url":null,"abstract":"Recently, artificial neural networks are widely used in medical prognosis. The goal of this work is to predict whether a patient will live at least one year after a heart attack by using neural networks as an example of prognosis. With this aim, multi layer perceptrons (MLP), radial basis function networks (RBF), probabilistic neural networks (PNN), generalized regression neural networks (GRNN) and learning vector quantization networks (LVQ) are used. To demonstrate the real performances of the networks, not only classification accuracies but also receiver operation characteristics (ROC) analysis must be investigated. For this purpose, both sensitivity-specificity values and ROC curves are evaluated for all networks","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121116804","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659791
H. Kul, I. Cavdar
In recent years, digital subscriber line (DSL) technology has been gaining popularity as a high speed access technology, thanks to its capability of delivering multimedia services. The major impairment for DSL technologies is crosstalk in the telephone lines. Therefore,in order to overcome this noise effect in DSL lines, complicated error mitigation and framing techniques have to be used in DSL systems. In this work, the crosstalk model of DSL lines is given, and the effect of crosstalk on the channel capacity of ADSL services (the most widely used DSL service type) is investigated.
{"title":"Modelling XDSL Lines under Crosstalk Effect","authors":"H. Kul, I. Cavdar","doi":"10.1109/SIU.2006.1659791","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659791","url":null,"abstract":"In recent years, digital subscriber line (DSL) technology has been gaining popularity as a high speed access technology, thanks to its capability of delivering multimedia services. The major impairment for DSL technologies is crosstalk in the telephone lines. Therefore,in order to overcome this noise effect in DSL lines, complicated error mitigation and framing techniques have to be used in DSL systems. In this work, the crosstalk model of DSL lines is given, and the effect of crosstalk on the channel capacity of ADSL services (the most widely used DSL service type) is investigated.","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116463372","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659733
A. Bilgin, A. Yilmaz
Relay networks have usually been investigated within a single source (S), relay (R), and destination (D) group in the literature. In this work, cooperative diversity techniques will be investigated for relay networks having multiple S, R and D's. Simulations results for linear and uniform S, R and D localizations will be presented
{"title":"Cooperative Diversity Techniques for Wireless Networks","authors":"A. Bilgin, A. Yilmaz","doi":"10.1109/SIU.2006.1659733","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659733","url":null,"abstract":"Relay networks have usually been investigated within a single source (S), relay (R), and destination (D) group in the literature. In this work, cooperative diversity techniques will be investigated for relay networks having multiple S, R and D's. Simulations results for linear and uniform S, R and D localizations will be presented","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115449499","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659742
M. Cavusoglu, Y. Serinağaoğlu, O. Eroğul
Several studies have done in order to determine the relationship between snoring and obstructive sleep apnea syndrome (OSAS). One of the common problem that is faced during the medical treatment of the apnea is the undetermination of the efficiency of the applied treatment in terms of objective criteria. It is needed to automatically detect each snoring episode in order to estimate the spectral features and determine the snoring sound intensity. In this study, an automatic detection system of acoustic snoring signals has been designed, to work with long duration respiratory sound recordings. The system was designed to select snoring episodes from simple snorers and OSAS patients and to reject the undesired waveforms. The sound recordings were taken from patients that are suspected of OSAS pathology while they were connected to the polysomnography in Gulhane Military Medical Academy (GMMA) Sleep Studies Laboratory. In order to validate the system, 500 snores were analysed taken from 30 patients with different apnea/hypopnea index (AHI) . Results were compared with manual annotations done by a medical doctor and the average sensitivity of the system is determined as 86%
{"title":"Analysing Snoring Sounds For Obstructive Sleep Apnea (OSA) Patients","authors":"M. Cavusoglu, Y. Serinağaoğlu, O. Eroğul","doi":"10.1109/SIU.2006.1659742","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659742","url":null,"abstract":"Several studies have done in order to determine the relationship between snoring and obstructive sleep apnea syndrome (OSAS). One of the common problem that is faced during the medical treatment of the apnea is the undetermination of the efficiency of the applied treatment in terms of objective criteria. It is needed to automatically detect each snoring episode in order to estimate the spectral features and determine the snoring sound intensity. In this study, an automatic detection system of acoustic snoring signals has been designed, to work with long duration respiratory sound recordings. The system was designed to select snoring episodes from simple snorers and OSAS patients and to reject the undesired waveforms. The sound recordings were taken from patients that are suspected of OSAS pathology while they were connected to the polysomnography in Gulhane Military Medical Academy (GMMA) Sleep Studies Laboratory. In order to validate the system, 500 snores were analysed taken from 30 patients with different apnea/hypopnea index (AHI) . Results were compared with manual annotations done by a medical doctor and the average sensitivity of the system is determined as 86%","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125268843","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659779
Ali Orkan Bayer, Tolga Q7iloglut, Meltem Turhan, Yondem Bilgisayar, Miihendisligi B6liimii Telektrik Ve Elektronik, Miihendisligi B6liimii
Large vocabulary continuous speech recognition can be performed with high accuracy for languages like English that do not have a rich morphological structure. However, the performance of these systems for agglutinative languages is very low. The major reason for that is, the language models that are built on the words do not perform well for agglutinative languages. In this study, three different language models that consider the structure of the agglutinative languages are investigated. Two of the models consider the subword units as the units of language modeling. The first one uses only the stem of the words as units, and the other one uses stems and endings of the words separately as the units. The third model, firstly, places the words into certain classes by using the co-occurrences of the words, and then uses these classes as the units of the language model. The performance of the models are tested by using two stage decoding; in the first stage, lattices are formed by using bi-gram models and then tri-gram models are used for recognition over these lattices. In this study, it is shown that the vocabulary coverage of the system seriously affects the recognition performance. For this reason, models that use stems and endings as the modeling unit perform better since their coverage of the vocabulary is higher. In addition to that, a single-pass decoder that can perform single pass decoding over these models is believed to increase the recognition performance
{"title":"Investigation of Different Language Models for Turkish Speech Recognition","authors":"Ali Orkan Bayer, Tolga Q7iloglut, Meltem Turhan, Yondem Bilgisayar, Miihendisligi B6liimii Telektrik Ve Elektronik, Miihendisligi B6liimii","doi":"10.1109/SIU.2006.1659779","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659779","url":null,"abstract":"Large vocabulary continuous speech recognition can be performed with high accuracy for languages like English that do not have a rich morphological structure. However, the performance of these systems for agglutinative languages is very low. The major reason for that is, the language models that are built on the words do not perform well for agglutinative languages. In this study, three different language models that consider the structure of the agglutinative languages are investigated. Two of the models consider the subword units as the units of language modeling. The first one uses only the stem of the words as units, and the other one uses stems and endings of the words separately as the units. The third model, firstly, places the words into certain classes by using the co-occurrences of the words, and then uses these classes as the units of the language model. The performance of the models are tested by using two stage decoding; in the first stage, lattices are formed by using bi-gram models and then tri-gram models are used for recognition over these lattices. In this study, it is shown that the vocabulary coverage of the system seriously affects the recognition performance. For this reason, models that use stems and endings as the modeling unit perform better since their coverage of the vocabulary is higher. In addition to that, a single-pass decoder that can perform single pass decoding over these models is believed to increase the recognition performance","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121482932","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659792
E. Ege, A. Saranli
Significant recent advances have been achieved in the mobile robotics area partly due to technological advances in low power computational resources, new power storage technologies and biologically inspired principles in robotics. Despite these advances, primary problems of robotics are still open for contribution. One of these problems is path planning/finding for mobile robots. There are a number of different methods proposed for path planning. One of the recent alternatives is the rapidly-exploring random trees (RRT). In this study, we propose a new approach to the nearest neighbor finding section of the method which promises to increase the speed performance of the algorithm
{"title":"A New Approach to Increase Performance of Rapidly-Exploring Random Trees (RRT) in Mobile Robotics","authors":"E. Ege, A. Saranli","doi":"10.1109/SIU.2006.1659792","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659792","url":null,"abstract":"Significant recent advances have been achieved in the mobile robotics area partly due to technological advances in low power computational resources, new power storage technologies and biologically inspired principles in robotics. Despite these advances, primary problems of robotics are still open for contribution. One of these problems is path planning/finding for mobile robots. There are a number of different methods proposed for path planning. One of the recent alternatives is the rapidly-exploring random trees (RRT). In this study, we propose a new approach to the nearest neighbor finding section of the method which promises to increase the speed performance of the algorithm","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"341 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122313327","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659914
Y. Bastanlar, S.I. Altingovde, A. Aksay, O. Alav, O. Cavus, Y. Yardimci, O. Ulusoy, U. Gudukbay, E. Cetin, G. Akar, S. Aksoy
A Web-based system-consisting of data entrance, access and retrieval modules-is constructed for museums. Internet users that visit the e-museum, are able to view the written and visual information, belonging to the artworks in the museum, are able to follow the virtual tour prepared for the different sections of the museum, are able to browse the artworks according to certain properties, are able to search the artworks having the similar visual content with the viewed artwork
{"title":"E-Museum: Web-based Tour and Information System for Museums","authors":"Y. Bastanlar, S.I. Altingovde, A. Aksay, O. Alav, O. Cavus, Y. Yardimci, O. Ulusoy, U. Gudukbay, E. Cetin, G. Akar, S. Aksoy","doi":"10.1109/SIU.2006.1659914","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659914","url":null,"abstract":"A Web-based system-consisting of data entrance, access and retrieval modules-is constructed for museums. Internet users that visit the e-museum, are able to view the written and visual information, belonging to the artworks in the museum, are able to follow the virtual tour prepared for the different sections of the museum, are able to browse the artworks according to certain properties, are able to search the artworks having the similar visual content with the viewed artwork","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124220799","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659686
A. Ozen, B. Soysal, I. Kaya
In this paper, carrier frequency offset (CFO) tracking performances of channel equalizers for single (SC) and multi carrier (MC) systems used in frequency selective Rayleigh fading channels are investigated. The performances of both systems for different values of CFO are compared. Since the desired performance cannot be achieved by CFO tracking ability of conventional LMS for SC and MC systems used in time varying channels, a fuzzy logic based LMS (F-LMS) algorithm is proposed. CFO tracking performance with the proposed F-LMS algorithm becomes very close to the performance of RLS algorithm with a small and negligible increment in computational complexity. Computer simulations using conventional LMS, normalized LMS, modified LMS, variable step size LMS-DFE, B-LMS-DFE and conventional RLS-DFE algorithms are performed in SC systems. The same algorithms are also used in MC (OFDM) systems in which the channel is estimated in time domain then used in frequency domain channel equalizer. For performance comparisons, the HIPERLAN/1 (SC) and HIPERLAN/2 (OFDM) standards are used as the working platforms during simulations. The obtained and compared results are given in Section 3
{"title":"The Effects of Fuzzy Logic on Carrier Frequency Offset Tracking Performance of Single and Multi Carrier Communication Systems","authors":"A. Ozen, B. Soysal, I. Kaya","doi":"10.1109/SIU.2006.1659686","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659686","url":null,"abstract":"In this paper, carrier frequency offset (CFO) tracking performances of channel equalizers for single (SC) and multi carrier (MC) systems used in frequency selective Rayleigh fading channels are investigated. The performances of both systems for different values of CFO are compared. Since the desired performance cannot be achieved by CFO tracking ability of conventional LMS for SC and MC systems used in time varying channels, a fuzzy logic based LMS (F-LMS) algorithm is proposed. CFO tracking performance with the proposed F-LMS algorithm becomes very close to the performance of RLS algorithm with a small and negligible increment in computational complexity. Computer simulations using conventional LMS, normalized LMS, modified LMS, variable step size LMS-DFE, B-LMS-DFE and conventional RLS-DFE algorithms are performed in SC systems. The same algorithms are also used in MC (OFDM) systems in which the channel is estimated in time domain then used in frequency domain channel equalizer. For performance comparisons, the HIPERLAN/1 (SC) and HIPERLAN/2 (OFDM) standards are used as the working platforms during simulations. The obtained and compared results are given in Section 3","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124952939","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659704
K. Kayabol, E. T. Akman
In this paper, we propose a model for image sequence based on particle mechanics. Proposed model is applied to high resolution image reconstruction problem. Hybrid Monte Carlo method is used to solve this problem
{"title":"Particle Mechanics Based Hybrid Monte Carlo Estimation of Image Sequence","authors":"K. Kayabol, E. T. Akman","doi":"10.1109/SIU.2006.1659704","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659704","url":null,"abstract":"In this paper, we propose a model for image sequence based on particle mechanics. Proposed model is applied to high resolution image reconstruction problem. Hybrid Monte Carlo method is used to solve this problem","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126144364","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 : 2006-04-17DOI: 10.1109/SIU.2006.1659682
A. Demirkol
In this paper, an alternative target density function (TDF) is proposed to image the radar targets. While the target density function is developed by a new technique in direction density function (DDF) form, it is obtained by considering a novel range and scanning angle plane different from the conventional methods. Although the imaging technique is obtained via the linear phased array radars, the problem associated with beamforming is bypassed in this algorithm
{"title":"Dogrultu Yogunluk Fonksiyonu Ile Radar Goruntu Isleme","authors":"A. Demirkol","doi":"10.1109/SIU.2006.1659682","DOIUrl":"https://doi.org/10.1109/SIU.2006.1659682","url":null,"abstract":"In this paper, an alternative target density function (TDF) is proposed to image the radar targets. While the target density function is developed by a new technique in direction density function (DDF) form, it is obtained by considering a novel range and scanning angle plane different from the conventional methods. Although the imaging technique is obtained via the linear phased array radars, the problem associated with beamforming is bypassed in this algorithm","PeriodicalId":415037,"journal":{"name":"2006 IEEE 14th Signal Processing and Communications Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125800160","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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