Pub Date : 2000-02-22DOI: 10.1109/NRSC.2000.838941
I. Ali
This paper introduces a simulation tool that could be used for the design and analysis of ATM networks and protocols. The simulator was developed in C/sup ++/ programming language and compiled on a DOS/Windows platform. It is a discrete-event simulator that has a user-friendly graphical user interface (GUI). The simulator has been tested and validated under different operational scenarios and shown to work well. It could run at both call and cell levels and in both Window and command line modes. The simulator functions comply with ATM Forum's PNNI specifications.
{"title":"ATROS: a simulator for the design and analysis of ATM networks and protocols","authors":"I. Ali","doi":"10.1109/NRSC.2000.838941","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838941","url":null,"abstract":"This paper introduces a simulation tool that could be used for the design and analysis of ATM networks and protocols. The simulator was developed in C/sup ++/ programming language and compiled on a DOS/Windows platform. It is a discrete-event simulator that has a user-friendly graphical user interface (GUI). The simulator has been tested and validated under different operational scenarios and shown to work well. It could run at both call and cell levels and in both Window and command line modes. The simulator functions comply with ATM Forum's PNNI specifications.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115792516","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838970
E. Soleit
In this paper a scheme is presented for enhancing speech that is severely interfered with by undesired periodic interference. The proposed scheme structure depends on the estimation of the interference using an adaptive line enhancer whose output represents a reference input to an adaptive noise canceller. The output of the noise canceller represents a course estimate of the desired speech signal with a moderate output signal to noise ratio. Then the output signal of the adaptive noise canceller is applied to another adaptive line enhancer to obtain a good estimate of the speech signal with high improvement factor in the output SNR of more than 40 dB.
{"title":"Cancellation of the communication channel interference","authors":"E. Soleit","doi":"10.1109/NRSC.2000.838970","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838970","url":null,"abstract":"In this paper a scheme is presented for enhancing speech that is severely interfered with by undesired periodic interference. The proposed scheme structure depends on the estimation of the interference using an adaptive line enhancer whose output represents a reference input to an adaptive noise canceller. The output of the noise canceller represents a course estimate of the desired speech signal with a moderate output signal to noise ratio. Then the output signal of the adaptive noise canceller is applied to another adaptive line enhancer to obtain a good estimate of the speech signal with high improvement factor in the output SNR of more than 40 dB.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114701940","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838979
H. A. Mokbel, M. Morsy, F. Abou-Chadi
This work presents a technique for automatic tissue labeling of 2-D magnetic resonance (MR) images of the human brain. This technique consists of two components: an unsupervised clustering algorithm and a knowledge-based technique. The knowledge-based technique contains information on the cluster distribution in feature space and tissue models. This approach also provides a first step toward classification of normal and abnormal images.
{"title":"Automatic segmentation and labeling of human brain tissue from MR images","authors":"H. A. Mokbel, M. Morsy, F. Abou-Chadi","doi":"10.1109/NRSC.2000.838979","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838979","url":null,"abstract":"This work presents a technique for automatic tissue labeling of 2-D magnetic resonance (MR) images of the human brain. This technique consists of two components: an unsupervised clustering algorithm and a knowledge-based technique. The knowledge-based technique contains information on the cluster distribution in feature space and tissue models. This approach also provides a first step toward classification of normal and abnormal images.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125462377","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838945
M. Dessouky, M. Hadhoud, F. A. Abd El-Samie
This paper develops a new approach to the adaptive line enhancement (ALE) of the emergency locator transmitter (ELT) signal where the input signal to the ALE is replaced by its autocorrelation function. This approach is related to signal processing using higher order statistics (HOS). The paper also compares the results of using the new approach with other different used methods. The first method uses the signal x/sub k/ as an input to the ALE, and the second method uses x/sub k//sup 2/ as the input to the ALE. The results illustrate the superiority of the proposed method over the other two methods.
{"title":"New approach to adaptive line enhancer using autocorrelation function for processing SARSAT signals","authors":"M. Dessouky, M. Hadhoud, F. A. Abd El-Samie","doi":"10.1109/NRSC.2000.838945","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838945","url":null,"abstract":"This paper develops a new approach to the adaptive line enhancement (ALE) of the emergency locator transmitter (ELT) signal where the input signal to the ALE is replaced by its autocorrelation function. This approach is related to signal processing using higher order statistics (HOS). The paper also compares the results of using the new approach with other different used methods. The first method uses the signal x/sub k/ as an input to the ALE, and the second method uses x/sub k//sup 2/ as the input to the ALE. The results illustrate the superiority of the proposed method over the other two methods.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131313466","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838963
M. El-Saba
In this paper we investigate analytically the transport mechanisms of both electrons and holes across semiconductor p-n junctions in view of the hydrodynamic model. We present a novel analytical solution of the set of hydrodynamic equations across semiconductor p-n junctions. In addition, we show whether the hydrodynamic model actually adds new information to our knowledge about carrier transport across semiconductor junctions, or simply results in some smoothing to the classical results we usually obtain using the drift-diffusion model. We demonstrate why the profile of the minority carrier distribution as well as the minority carrier current density are completely different from the classical drift-diffusion theory around the edges of space-charge regions. The analytical results are in close agreement with the exact numerical solution obtained by simulation.
{"title":"Theory of nonlinear transport of hot carriers across semiconductor junctions","authors":"M. El-Saba","doi":"10.1109/NRSC.2000.838963","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838963","url":null,"abstract":"In this paper we investigate analytically the transport mechanisms of both electrons and holes across semiconductor p-n junctions in view of the hydrodynamic model. We present a novel analytical solution of the set of hydrodynamic equations across semiconductor p-n junctions. In addition, we show whether the hydrodynamic model actually adds new information to our knowledge about carrier transport across semiconductor junctions, or simply results in some smoothing to the classical results we usually obtain using the drift-diffusion model. We demonstrate why the profile of the minority carrier distribution as well as the minority carrier current density are completely different from the classical drift-diffusion theory around the edges of space-charge regions. The analytical results are in close agreement with the exact numerical solution obtained by simulation.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128317820","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838948
N. Yousef, A. Sayed
Infrastructure-based mobile-positioning is receiving increasing attention in the field of wireless communications. This is is due to an order issued by the Federal Communications Commission (FCC) that mandates all wireless service providers to locate an emergency 911 caller within a high accuracy. Overlapping multipath propagation is one of the main sources of mobile-positioning errors, especially in fast channel fading situations. We present a mathematical framework for overlapping multipath propagation over fading channels, which leads to developing a block least squares method for overlapping multipath resolving.
{"title":"Robust multipath resolving in fading conditions for mobile-positioning systems","authors":"N. Yousef, A. Sayed","doi":"10.1109/NRSC.2000.838948","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838948","url":null,"abstract":"Infrastructure-based mobile-positioning is receiving increasing attention in the field of wireless communications. This is is due to an order issued by the Federal Communications Commission (FCC) that mandates all wireless service providers to locate an emergency 911 caller within a high accuracy. Overlapping multipath propagation is one of the main sources of mobile-positioning errors, especially in fast channel fading situations. We present a mathematical framework for overlapping multipath propagation over fading channels, which leads to developing a block least squares method for overlapping multipath resolving.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124700656","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838955
W. Shalash, F. Abou-Chadi
This paper presents an automatic fingerprint classification technique similar to that reported by Ongun and Halici (see Proc. of IEEE vol.84, no.10, p.1497-12, 1996) but, an inverse filtering technique was introduced to restore the distorted parts of the images prior to the feature extraction stage. The results have shown that introducing the inverse filtering stage has improved the percentage of correct classification. Typical classification accuracy reaches 91% with no rejects, 98% with 8.1% rejects compared to the 87% with no rejects, 95% with 9.4% rejects obtained using the previously reported technique.
本文提出了一种类似于Ongun和Halici所报道的自动指纹分类技术(参见Proc. of IEEE vol.84, no。10, p.1497-12, 1996)，但是，在特征提取阶段之前，引入反滤波技术来恢复图像的扭曲部分。结果表明，引入反滤波阶段提高了分类正确率。典型的分类准确率达到91%(无拒绝)，98%(8.1%拒绝)，而使用先前报道的技术获得的分类准确率为87%(无拒绝)，95%(9.4%拒绝)。
{"title":"A fingerprint classification technique using multilayer SOM","authors":"W. Shalash, F. Abou-Chadi","doi":"10.1109/NRSC.2000.838955","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838955","url":null,"abstract":"This paper presents an automatic fingerprint classification technique similar to that reported by Ongun and Halici (see Proc. of IEEE vol.84, no.10, p.1497-12, 1996) but, an inverse filtering technique was introduced to restore the distorted parts of the images prior to the feature extraction stage. The results have shown that introducing the inverse filtering stage has improved the percentage of correct classification. Typical classification accuracy reaches 91% with no rejects, 98% with 8.1% rejects compared to the 87% with no rejects, 95% with 9.4% rejects obtained using the previously reported technique.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132294990","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838918
F.M. Kabbary, M. Khattab, A. Swidan, M.C. Hately
Crossed field antenna (CFA) theory and applications are widely discussed. The electrical characteristics of the two inputs of the CFA are very important and have to be analyzed and studied carefully. This analysis is considered in detail. In addition, a phasing and matching unit which are inserted between the transmitter and the CFA antenna are designed and executed to fulfil the analysis of this non-resonant antenna.
{"title":"Phasing and matching units for the CFA","authors":"F.M. Kabbary, M. Khattab, A. Swidan, M.C. Hately","doi":"10.1109/NRSC.2000.838918","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838918","url":null,"abstract":"Crossed field antenna (CFA) theory and applications are widely discussed. The electrical characteristics of the two inputs of the CFA are very important and have to be analyzed and studied carefully. This analysis is considered in detail. In addition, a phasing and matching unit which are inserted between the transmitter and the CFA antenna are designed and executed to fulfil the analysis of this non-resonant antenna.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114204267","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838938
S. E. El-Khamy, Adel Hamdi Ali
In this paper, we describe the generation of pseudo-random (PN) binary sequences using a technique based on fuzzy logic. The generated fuzzy binary sequences are shown to have good randomness properties and their length can be made extremely long. Such sequences are suitable for data encryption and for secure direct-sequence (DS) spread-spectrum (SS) systems. We also describe the generation of code families with good auto- and cross-correlation properties, which make them suitable for secure code-division multiple-access (CDMA) systems. Although the generated codes appear to be random and enjoy most of the properties of random codes, they are deterministic. In other words, they can be exactly regenerated by fixing the parameters of the fuzzy random number generator.
{"title":"Fuzzy binary sequences for secure spread-spectrum systems","authors":"S. E. El-Khamy, Adel Hamdi Ali","doi":"10.1109/NRSC.2000.838938","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838938","url":null,"abstract":"In this paper, we describe the generation of pseudo-random (PN) binary sequences using a technique based on fuzzy logic. The generated fuzzy binary sequences are shown to have good randomness properties and their length can be made extremely long. Such sequences are suitable for data encryption and for secure direct-sequence (DS) spread-spectrum (SS) systems. We also describe the generation of code families with good auto- and cross-correlation properties, which make them suitable for secure code-division multiple-access (CDMA) systems. Although the generated codes appear to be random and enjoy most of the properties of random codes, they are deterministic. In other words, they can be exactly regenerated by fixing the parameters of the fuzzy random number generator.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132107321","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838982
A. Hassanin
Electromagnetic waves from the lower radio frequencies up through the optical spectrum can generate a myriad of effects and responses in biological materials at high radiation intensities, producing burns, cataracts chemical change, etc. Biological effects have been reported at lower radiation intensities, but it is not now known if low level effects are harmful. Most of the effects are not harmful under controlled conditions, and can thereby be used for therapeutic purposes and to make useful diagnostic measurements. The problem of the elements of a cellular radiomobile system penetrating materials and the resultant internal power absorption is approached from theoretical viewpoints. A comparison is made between the frequency of the Global Mobile System (GMS) for communications and the frequency of medical diagnostics. The transmission-line-matrix (TLM) method is applied to solve the problems of the field and absorption intensity with emphasis upon the general problems of microwaves. The results are discussed in terms of the field and absorption intensity effects of microwaves in biological tissues. Some results showing the effects of (GMS) and the medical diagnostic frequencies are discussed.
{"title":"Electromagnetic wave generation from elements of a cellular radiomobile system","authors":"A. Hassanin","doi":"10.1109/NRSC.2000.838982","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838982","url":null,"abstract":"Electromagnetic waves from the lower radio frequencies up through the optical spectrum can generate a myriad of effects and responses in biological materials at high radiation intensities, producing burns, cataracts chemical change, etc. Biological effects have been reported at lower radiation intensities, but it is not now known if low level effects are harmful. Most of the effects are not harmful under controlled conditions, and can thereby be used for therapeutic purposes and to make useful diagnostic measurements. The problem of the elements of a cellular radiomobile system penetrating materials and the resultant internal power absorption is approached from theoretical viewpoints. A comparison is made between the frequency of the Global Mobile System (GMS) for communications and the frequency of medical diagnostics. The transmission-line-matrix (TLM) method is applied to solve the problems of the field and absorption intensity with emphasis upon the general problems of microwaves. The results are discussed in terms of the field and absorption intensity effects of microwaves in biological tissues. Some results showing the effects of (GMS) and the medical diagnostic frequencies are discussed.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133710509","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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