2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel最新文献

{"title":"Search for a mobile target by ground vehicle on a topographic terrain","authors":"M. Israel, E. Khmelnitsky, E. Kagan","doi":"10.1109/eeei.2012.6377123","DOIUrl":"https://doi.org/10.1109/eeei.2012.6377123","url":null,"abstract":"We address a continuous space search problem, where the searcher and the mobile target are moving on a topographic terrain, and the goal of the searcher is to locate the target in minimum expected time. The detection occurs when the target is located in the searcher's observed area. We assume that the searcher's observed area is bounded by topographic obstacles and changes in time along with the searcher's trajectory. In the report we provide a general algorithm of search, which is applicable to the search for both static and mobile targets. It follows a two-step solution: the first step is a terrain analysis, and at the second step the searcher's path is determined. For all simulated topographies the suggested algorithm converges and provides near-optimal solutions for the search of both static and moving targets even in the cases, where standard methods fail to provide solutions in polynomial time.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128956002","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}

{"title":"Anomaly detection using an adaptive algorithm for estimating mixtures of backgrounds in hyperspectral images","authors":"A. Orfaig, S. Rotman, D. Blumberg","doi":"10.1109/EEEI.2012.6377129","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6377129","url":null,"abstract":"Anomaly detection in hyperspectral data has been considered for various applications. The main purpose of anomaly detection is to detect pixel vectors (i.e. spectral vectors) whose spectra differ significantly from the background spectra. In anomaly detection, no prior knowledge about the target is assumed. In this paper we will present a new method for anomaly detection based on the SRX (Segmented RX) algorithm, with an emphasis on the edges between the segments. This method incorporates an adaptive algorithm with fast convergence which we developed for estimating the mixing coefficients of adjacent segments to fit the spectra of edge pixels. Achieving it allows us to reconstruct its mean vector and its covariance matrix, and operate the RX algorithm locally. The developed algorithm is a fusion and improvement of two algorithms (Steepest Descent and Newton's Method); it combines the benefits of each method while eliminating their drawbacks, so its convergence is fast and stable.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127437183","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}

{"title":"Investigation of constitutive parameter extraction methods for artificial materials based on metamaterial technology","authors":"D. Cohen, R. Shavit","doi":"10.1109/EEEI.2012.6377151","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6377151","url":null,"abstract":"In this paper the problem of metamaterial constitutive parameters extraction is considered. The leading methods reviewed are: the S-parameters method, the field averaging method and the eigen-solution method. A new approach based on modal analysis using plane wave expansion of Bloch functions is proposed. The existing methods are reviewed and compared in performance to the proposed method.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124821198","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}

{"title":"Stochastic H∞ output-feedback control for linear retarded systems","authors":"E. Gershon, U. Shaked","doi":"10.1109/EEEI.2012.6376909","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6376909","url":null,"abstract":"In this paper a new method for designing a reduced-order output feedback controller for a linear time-invariant retarded system with stochastic state-multiplicative Wiener-type noise, that achieves a minimum bound on the H∞ performance level, is introduced. The solution of the stochastic H∞ reduced-order output-feedback control problem is solved, for the stationary case, via the input-output approach where the system is replaced by a non-retarded system that contain, instead, deterministic norm-bounded uncertainties. The stochastic uncertainties appear in the dynamic matrices, which correspond to the delayed and non-delayed states of the system. In this problem, a cost function is defined which is the expected value of the standard H∞ performance cost with respect to the stochastic parameters.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123797262","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}

{"title":"Temporal and spatial compression of infrared imagery sequences containing slow moving point targets","authors":"R. Huber-Shalem, O. Hadar, S. Rotman, M. Huber-Lerner","doi":"10.1109/EEEI.2012.6377096","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6377096","url":null,"abstract":"Infrared imagery sequences are used for detecting moving targets in the presence of evolving cloud clutter or background noise. This research focuses on slow moving point targets that are less than one pixel in size, such as aircraft at long ranges from a sensor. Since transmitting infrared (IR) imagery sequences to a base unit or storing them consume considerable time and resources, a compression method which maintains the point target detection capabilities is desired. In our previous work, we introduced two temporal compression methods, which preserve the temporal profile properties of the point target, in the form of the discrete cosine transform (DCT) quantization and the parabola fit. In the present work, we continue the compression task method of the DCT quantization by applying spatial compression over the temporally compressed coefficients, followed by bit encoding. We evaluate the proposed compression methods using an SNR-based measure for point target detection. Furthermore, we introduce an automatic detection algorithm of the target tracks that extracts the target location from the SNR scores image, which is acquired during the evaluation process. We previously determined that it is necessary to establish a minimal noise level in the SNR-based measure, to compensate for smoothing that is induced by the compression. Here, the noising process is modified, in order to allow detection of targets traversing all background types.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114419413","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}

{"title":"Initial conditions for speaker diarization","authors":"I. Lapidot","doi":"10.1109/EEEI.2012.6376947","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6376947","url":null,"abstract":"We examine different initializations and their influence on the performances of iterative speaker diarization system. Six methods of initializations were under examination, starting with a naive frame based random initialization, continue with uniform conversation dividing between the clusters and ending with weighted segmental k-means. The initialization methods were tested on two telephone conversation databases: LDC America CallHome and NIST SRE-05. In contrast to most works on meeting and shows where the speakers turns are not very frequent and minimal duration constraints of 2.5 sec or more can be applied to capture speakers statistics, in telephone conversations the speaker turns are much more frequent and the minimum duration should be set to several hundreds of milliseconds. In such cases, good cluster initialization is very important. It will be shown that good initialization using weighted segmental k-means is outperforms all other methods, and the either fixed or minimum duration constraints can be minor, and even without any constraint on the segment duration the results are significantly better than in other initializations.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116816836","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}

{"title":"H.264 SVC extension for peer to peer schemes","authors":"O. Mokryn, A. Platner, I. David, O. Amir","doi":"10.1109/EEEI.2012.6377014","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6377014","url":null,"abstract":"The H.264 Scalable Video Coding (SVC) standard enables scalability by encoding a video stream into multiple layers or sub-streams each with different quality information. The coding creates a hierarchical structure in which the lowest layer, termed the base layer, is required for decoding. Additional enhancement layers improve the video's quality. SVC enables different quality of experience for different users based on the number of layers they receive, i.e., the number of substreams. In peer to peer streaming schemes SVC can be used in many ways. Current SVC standard enables users to exchange segments that consist of all the substreams that create together the layer of experience they desire. Enabling users to exchange segments that belong to different substreams and hence different layers can motivate a variety of applications for both wired and wireless P2P streaming. In this paper we suggest an extension to the H.264 SVC standard, that enables the transport of separate substreams, and term it SVC multiplexer. We have implemented the multiplexer as part of the JSVM software, and make it available at our site. To test the multiplexer, we have tested it in a peer-to-peer environment. An additional contribution of the paper is the comparison of SVC performance with two different segment sizes of 2 seconds and 10 seconds. Our results show that slicing the movie to a ten seconds segments actually gives a better tradeoff than the smaller two second slice.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128408552","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}

{"title":"Dithered probabilistic shaping","authors":"N. Palgy, R. Zamir","doi":"10.1109/EEEI.2012.6376960","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6376960","url":null,"abstract":"Shaping is a practical method to approximate the optimal Gaussian input distribution for a power-constrained AWGN channel. The Shaping Gain is the reduction in average constellation energy, compared to a uniform (equi-probable) cubical constellation. The maximal Shaping Gain at high SNR is 1.53dB, which can be achieved by a constellation shape of a high dimensional ball with a uniform distribution. By freeing ourselves from the idea of equally probable symbols, we can reach the full shaping gain even with a one dimensional constellation. This idea has been studied before within the high SNR regime. We study and improve the system performance for medium SNRs (rates of 1-3 bit/1D) by inserting dither, and using MAP decoding to take into account the unequal probabilities. We also incorporate coding, and compare the system to regular coded uniform QAM signaling. The results show improvements of up to 0.6dB with respect to older works, and a total shaping gain of about 1dB.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129439651","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}

{"title":"Microwave target enhancement using the perspectives of multiple-angular images","authors":"Y. Wool, B. Kapilevich, B. Litvak, M. Anisimov, D. Hardon, Y. Pinhasi, S. R. Rotmanb","doi":"10.1109/EEEI.2012.6377107","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6377107","url":null,"abstract":"This In this paper, we describe the image processing techniques needed to produce sharp images using microwave technology. A scanning system produces a set of images representing the return of an object at several angles. By treating each point as a vector and calculating the autocorrelation function, we can produce relatively sharp images of the target. The technology can be used for detecting hidden targets.","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124237070","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}

{"title":"Development of compact electrical source based on the synergetic partnership between conventional electrochemical storage batteries and ultracapacitors","authors":"M. Averbukh, M. Krinitsky, B. Rivin","doi":"10.1109/EEEI.2012.6377037","DOIUrl":"https://doi.org/10.1109/EEEI.2012.6377037","url":null,"abstract":"Nowadays, the need of compact moveable powerful electrical sources is going up. The most well-known applications of these arrangements are needed in automotive and transportation industry, in devices of emergency starting of internal combustion engines, for supplying pulses of high current in special equipment and so on. Most of these implementations may be developed on the base of conventional electrochemical storage batteries (ESB). ESB are representing the suitable kind of rechargeable electrical sources and may be applicable in moveable equipment. But the power parameters of batteries compare to their dimensions leave much to be desired. If the high power (current) is required (together with the small dimensions of the energy system) the employ of ESB only is not really capable. The synergetic combination of ESB together with UC seems to be very promising solution in this case. A conjunction between these two different energy sources links together the outstanding power characteristics of UC with relatively high specific energy of ESB. However, the combination of these devices requires decisions of some technical problems. For example, when the voltages of UC and ESB a priori are different, and this difference is used for special goal, for example to provide high load current when the battery is weak and unable to deliver the needed power. The special inverter has to be included between UC and ESB in this case. Its major function is providing UC charging from ESB. The problem of UC charging is stemming from its very small (sometimes negligible) internal resistance and usual connection between terminals of UC and ESB may cause to the serious difficulties such as a very high equalizing current, small charging efficiency and diminished battery's service life. These problems become expremely smart when UC before charging is fully or partially empty. Additional serious difficulties are associated with electric security needs. This kind of devices are equipped, as a rule, with flexible cables are being ended by special clamps for load connecting. An occasionally shortening of these clamps during a device leading to a load may cause serious troubles. Thus, the preventing of such cases depicts an important technical challenge. The supplementary problem is represented by the need to switch the power supply on at the right moment of time and only after this device will be connected by cables to the load. This problem is issuing in principle from the previous one. If it will be solved this would solve automatically the first problem too because the switching power supply at the needed moment of time means that shortening of clamps before their connection to the load will not cause any damage. Thus, this device has to be equipped with special power circuit and it's control system which algorithm will i) avoid occasionally clamp shortening ii) will define the moment of time when the load has to be connected to the power supply. The presented work is deali","PeriodicalId":177385,"journal":{"name":"2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel","volume":"75 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114117310","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}