Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)最新文献_第2页

Design of a VLSI neural network arrhythmia classifier VLSI神经网络心律失常分类器的设计

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760911

H. Shawkey, H. Elsimary, H. Haddara, H. Ragaie

引用次数: 6

Optical constants of lead sulfide in the 3-11 microns window 3-11微米窗口内硫化铅的光学常数

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760938

I. Elfalla, A. Zaki, S. Alian

引用次数: 0

On the spectral efficiency of different coherent techniques for frequency comb multiple access systems 频率梳多址系统中不同相干技术的频谱效率

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760891

M. Ali

引用次数: 1

Adaptive interference canceller with minimized number of sensors 最小传感器数量的自适应干扰消除器

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760941

E. Soleit, K. El-Barbary

引用次数: 0

Photonic switch using surface-emitting laser diode and APD 采用表面发射激光二极管和APD的光子开关

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760935

M. Ibrahim

引用次数: 0

Modeling of magneto-optic eddy current inspection of hidden flaws in aircraft skin 飞机蒙皮隐藏缺陷磁光涡流检测建模

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760929

I. Elshafiey

{"title":"Modeling of magneto-optic eddy current inspection of hidden flaws in aircraft skin","authors":"I. Elshafiey","doi":"10.1109/NRSC.1999.760929","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760929","url":null,"abstract":"Eddy current inspection of aging aircraft has currently achieved new developments with the introduction of magneto-optic imaging (MOI). Real time images of aircraft skin cracks and corrosion can be obtained using MOI instruments. The sensitivity of MOI inspection and hence the feasibility of its use for actual configuration depends' on instrument parameters, structure geometry, and flaw size and depth. Computational modeling of the three dimensional structure under test and its interaction with the eddy current source is inevitable to enhance the equipment design and determine the probability of detection of critical flaw size defects using MOI. Finite element modeling of eddy current magneto-optic imaging is invoked in this paper and applied to a typical configuration of interest in aircraft inspection. The configuration considers a flaw initiating under the cap of a fastener used to connect two aluminum layers of the aircraft skin. Two materials are considered for the fastener: titanium and steel. The results are presented in a field map of the normal magnetic flux field, similar to expected images using MOI inspection. Simulation results revealed that the change in the vertical component of the magnetic field is noticeable for this configuration, and that MOI can be used to detect hidden flaws covered by the fastener cap.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127881694","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}

引用次数: 6

Design of two channel IIR QMF filters with smooth wavelet functions 具有光滑小波函数的双通道IIR QMF滤波器的设计

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760904

A. I. Saleh, M. Fahmy, G. Raheem, G. Fahmy

引用次数: 0

Efficient evaluation of the error probabilities of CDMA communication in mobile satellite channel 移动卫星信道中CDMA通信误差概率的有效评估

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760892

M. Mayhoub, R. E. Zanfally, H. El Hennawy, S. Mahrous

{"title":"Efficient evaluation of the error probabilities of CDMA communication in mobile satellite channel","authors":"M. Mayhoub, R. E. Zanfally, H. El Hennawy, S. Mahrous","doi":"10.1109/NRSC.1999.760892","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760892","url":null,"abstract":"This paper is concerned with the analytical performance evaluation of direct sequence code division multiple access (DS-CDMA) signal transmission through a mobile satellite channel's system using Gold sequences. Because of the inaccuracy of the Gaussian approximation for the multiple access interference (MAI). An improved Gaussian process with good accuracy has been used. The impairments taken into consideration in the system are the non-linear effect of a travelling wave tube amplifier (TWTA) onboard the satellite (AM-to-AM and AM-to-PM conversions), additive white Gaussian noise (AWGN) and mobile propagation shadowing channel. The performance of the conventional detector receiver for MAI and the propagation channel modelled as shadowing (lognormal and Rayleigh) in suburban areas are evaluated both analytically and by importance sampling simulation. The obtained results of both the analytical and simulation methods, in terms of the dependence of the error probability on shadowing channel and the down-link noise at different values of input back-off of TWTA, are in good agreement.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128122755","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}

引用次数: 0

A 3D modified FDTD (2,4) algorithm for improving phase accuracy with low resolution 一种提高低分辨率下相位精度的三维改进FDTD(2,4)算法

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760876

Hany E. Abd El-Raoufk, E.A. El-Diwani, A. Ammar, F. El-Hefnawi

引用次数: 1

Random neural network filter for land mine detection 随机神经网络地雷探测滤波器

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760927

H. Abdelbaki, Erol Gelenbe, Taskin Kocak, S. El-Khamy

{"title":"Random neural network filter for land mine detection","authors":"H. Abdelbaki, Erol Gelenbe, Taskin Kocak, S. El-Khamy","doi":"10.1109/NRSC.1999.760927","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760927","url":null,"abstract":"The two primary measures of land mine detection performance are the probability of detection P/sub d/ and the probability of false alarm P/sub fa/. These two measures are highly inter-dependent and must be evaluated together. The relationship between the two probabilities directly affects the overall performance of the sensor in the field. In this paper we introduce a novel false alarm non-parametric filter based on the random neural network (RNN) model and the /spl delta/-technique. The study is based on mine detection using electromagnetic induction (EMI) sensors. The minefield data are pre-processed via the /spl delta/-technique before applying it to the RNN. The RNN has a predefined structure that tries to implement a mapping close enough in some precise sense to the discrimination function between non-mine and mine patterns. Limited numbers of non-mine and mine patterns, extracted from a small calibration area for a certain minefield provided by DARPA, are used for training the RNN. We show that the RNN gives effective decisions on patterns measured on other locations using different EMI sensor. The results show that the RNN produces a probability of detection up to 100 per cent with a substantial reduction of false alarms over the /spl delta/-technique (up to 40 per cent false alarm filtering).","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114543237","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}

引用次数: 7