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Hierarchical Polytope ARTMAP for Supervised Learning

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Journal of Computer Science & Technology 2010年第5期25卷 1071-1082页

作者：廖鑫鹏吴永强韩崇昭 Southwest research institute of electronics and telecommunication Technology College of electronics and Information Engineering Xi'an Jiaotong University

The recent Polytope ARTMAP（PTAM） suggests that irregular polytopes are more flexible than the predefined category geometries to approximate the borders among the desired output ***,category expansion and adjustment steps without statistical information make PTAM not robust to noise and category *** order to push the learning problem towards Structural Risk Minimization（SRM）,this paper proposes Hierarchical Polytope ARTMAP （HPTAM） to use a hierarchical structure with different levels,which are determined by the complexity of regions incorporating the input ***,overlapping of simplexes from the same desired prediction is designed to reduce category *** HPTAM is still inevitably sensible to noisy outliers in the presence of noise,main experimental results show that HPTAM can achieve a balance between representation error and approximation error,which ameliorates the overall generalization capabilities.

关键词： structural risk minimization polytope ARTMAP hierarchical structure representation error approximation error

Gait Recognition by Cross Wavelet Transform and Graph Model

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IEEE/CAA Journal of Automatica Sinica 2018年第3期5卷 718-726页

作者： Sagar Arun More Pramod Jagan Deore Department of electronics and telecommunication Engineering R.C.Patel Institute of Technology

In this paper, a multi-view gait based human recognition system using the fusion of two kinds of features is *** use cross wavelet transform to extract dynamic feature and bipartite graph model to extract static feature which are coefficients of quadrature mirror filter(QMF)-graph wavelet filter bank. Feature fusion is done after normalization. For normalization of features, min-max rule is used and mean-variance method is used to find weights for normalized features. Euclidean distance between each feature vector and center of the cluster which is obtained by k-means clustering is used as similarity measure in Bayesian framework. Experiments performed on widely used CASIA B gait database show that, the fusion of these two feature sets preserve discriminant information. We report 99.90 % average recognition rate.

关键词： Binary sequences feature extraction identification of persons linear discriminant analysis(LDA)

Adaptive Three-phase Estimation of Sequence Components and Frequency Using H∞ Filter Based on Sparse Model

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Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 981-990页

作者： Umamani Subudhi Harish Kumar Sahoo Sanjeev Kumar Mishra Department of electronics and telecommunication Engineering Indian Institute of Information Technology(IIIT)BhubaneshwarIndia Department of electronics and telecommunication Engineering Veer Surendra Sai University of Tecnology(Burla)SambalpurIndia

The estimation of sequence or symmetrical components and frequency in three-phase unbalanced power system is of great importance for protection and *** paper proposes a new H∞filter based on sparse model to track the sequence components and the frequency of three-phase unbalanced power *** inclusion of sparsity improves the error convergence behavior of estimation model and hence short-duration non-stationary PQ events can easily be tracked in the time *** proposed model is developed using l1 norm penalty in the cost function of H∞filter,which is quite suitable for estimation across all the three phases of an unbalanced *** model uses real state space modeling across three phases to estimate amplitude and phase parameters of sequence ***,frequency estimation uses complex state space modeling and Clarke transformation generates a complex measurement signal from the unbalanced three-phase *** state vector used for frequency estimation consists of two state *** proposed sparse model is tested using distorted three-phase signals from IEEE-1159-PQE database and the data generated from experimental laboratory *** analysis of absolute and mean square error is presented to validate the performance of the proposed model.

关键词： Sequence component Clarke transformation H∞filter state space model

Bi-directional and concurrent proof of ownership for stronger storage services with de-duplication

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Science China(Information Sciences) 2018年第3期61卷 84-94页

作者： Taek-Young YOUN Ku-Young CHANG electronics and telecommunications research institute

In storage service, data de-duplication is a specialized technique for eliminating duplicate copies of repeating data in storage. Especially, client-side de-duplication has more merits than server-side deduplication since they can improve both the space efficiency and the communication bandwidth. For secure client-side de-duplication, we need a way to prove the ownership of a file to be stored. In the upload step,the server should verify the ownership of a client to give the right of the file without uploading it. On the contrary, the client also want to verify the retrievability for the file since he will delete it from his storage after protocol execution. Existing proof of ownership techniques have been designed for server's need. In this paper, we first point out that we need the second property in client's view point, and give a very simple and practical solution which can support the server and the client to prove that they have the same file. We first describe a generic strategy which can help us to construction a bi-directional and concurrent proof of ownership technique from an ordinary proof of ownership technique, and then give an efficient hash-based scheme with security proof in the random oracle model.

关键词： cloud storage secure de-duplication data out-source proof of ownership bi-directional and concurrent proof

A two-dimensional analytical-model-based comparative threshold performance analysis of SOI-SON MOSFETs

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Journal of Semiconductors 2011年第10期32卷 32-38页

作者： Sanjoy Deb Saptarsi Ghosh N Basanta Singh A K De Subir Kumar Sarkar Department of electronics&telecommunication Engineering Jadavpur University Department of electronics&Communication Engineering Manipur Institute of Technology Department of electronics&Communication Engineering National Institute of Technology

A generalized threshold voltage model based on two-dimensional Poisson analysis has been developed for SOI/SON *** short channel field effects,such as fringing fields,junction-induced lateral fields and substrate fields,are carefully investigated,and the related drain-induced barrier-lowering effects are incorporated in the analytical threshold voltage *** analytical model-based simulation,the threshold voltage roll-off and subthreshold slope for both structures are compared for different operational and structural parameter *** of analytical simulation are compared with the results of the ATLAS 2D physics-based simulator for verification of the analytical *** performance of an SON MOSFET is found to be significantly different from a conventional SOI *** short channel effects are found to be reduced in an SON,thereby resulting in a lower threshold voltage roll-off and a smaller subthreshold *** type of analysis is quite useful to figure out the performance improvement of SON over SOI structures for next generation short channel MOS devices.

关键词： silicon-on-insulator silicon-on-nothing Poisson's equation short channel effects threshold voltage roll-off subthreshold slope

Impact of Phase Noise on TDMS Based Calibration for Spaceborne Multi-Beam Antennas

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China Communications 2018年第3期15卷 128-136页

作者： Yujie Lin Xiangyuan Bu Shuai Wang Yuan Chai Jianping An School of Information and electronics Beijing Institute of Technology institute of telecommunication Satellite China Academy of Space Technology

For spaceborne multi-beam antennas(MBAs), time division multiplexed switching(TDMS) based calibration receiver can reduce implementation costs effectively and is very suitable for large-scale applications. However, in practice, random phase noise imposed by noisy local oscillators can cause significant performance degradation in TDMS-based calibration systems. Characterization of phase noise effects is therefore crucial for practical applications. In this paper, we analyze the impact of phase noise on the calibration performance for a MBA system. Specifically, we derive the relationship between the probability of correct amplitude/phase estimation and various practical factors involving the signal-to-noise ratio(SNR), the standard deviation of phase noise, the given tolerance region, and the length of the spreading code. The results provide high efficiency for evaluating the calibration performance of the MBAs based on TDMS, especially for precisely anticipating the impact of phase noise. Finally, the accuracy of the derived results is assessed by simulations in different scenarios.

关键词： multi-beam antenna calibration phase noise time division multiplexed switching

Negative Lumped Element Matching Technique for Performance Enhancement of Ultra-Wideband LNA

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China Communications 2019年第3期16卷 143-153页

作者： Kishor G Sawarkar Kushal Tuckley research Scholar at Department of electronics and telecommunication MCT's RGIT University of Mumbai IITB Mumbai

The paper aims at designing of two stage cascaded ultra-wideband(UWB) low noise amplifier(LNA) by using negative image amplifier technique. The objective of this article is to show the performance improvement using negative image amplifier technique and realization of negative valued lumped elements into microstrip line geometry. The innovative technique to realize the negative lumped elements are carried out by using Richard's Transformation and transmission line calculation. The AWR microwave office tool is used to obtain characteristics of UWB LNA design with hybrid microwave integrated circuit(HMIC) technology. The 2-stage cascaded LNA design using negative image amplifier technique achieves average gain of 23 dB gain and low noise Figure of less than 2 dB with return loss less than-8 dB for UWB 3-10 GHz. The Proper bias circuit is extracted using DC characteristics of transistor at biasing point 2 V, 20 mA and discussed in detail with LNA layout. The negative image matching technique is applied for both input and output matching network. This work will be useful for all low power UWB wireless receiver applications.

关键词： LNA ultrawide band pHEMT matching network HMIC

A novel target detection approach based on adaptive radar waveform design

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Chinese Journal of Aeronautics 2013年第1期26卷 194-200页

作者： Wang Haitao Shi Lei Wang Youlin Ben De Nanjing research institute of electronics Technology

To resolve problems of complicated clutter, fast-varying scenes, and low signal-clutterratio （SCR） in application of target detection on sea for space-based radar （SBR）, a target detection approach based on adaptive waveform design is proposed in this paper. Firstly, complicated sea clutter is modeled as compound Gaussian process, and a target is modeled as some scatterers with Gaussian reflectivity. Secondly, every dwell duration of radar is divided into several sub-dwells. Regular linear frequency modulated pulses are transmitted at Sub-dwell 1, and the received signal at this sub-dwell is used to estimate clutter covariance matrices and pre-detection. Estimated matrices are updated at every following sub-dwell by multiple particle filtering to cope with fast-varying clutter scenes of SBR. Furthermore, waveform of every following sub-dwell is designed adaptively according to mean square optimization technique. Finally, principal component analysis and generalized likelihood ratio test is used for mitigation of colored interference and property of constant false alarm rate, respectively. Simulation results show that, considering configuration of SBR and condition of complicated clutter, 9 dB is reduced for SCR which reliable detection requires by this target detection approach. Therefore, the work in this paper can markedly improve radar detection performance for weak targets.

关键词： Adaptive waveform design Generalized likelihood ratio test Multiple particle filter Principal component analysis Radar systems Space-based radar

A 14b 250MSps Pipelined ADC with Digital Self-calibration in 0.18μm CMOS Process

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Chinese Journal of electronics 2018年第3期27卷 535-539页

作者： LIU Haitao WU Junjie ZHANG Lizheng DENG Qing SUN Jie Nanjing research institute of electronics Technology

A 14-bit pipelined Analog-to-digital converter(ADC) with a single-side digital self-calibration in a 0.18μm CMOS process is presented. The single-side foreground digital self-calibration is introduced to reduce the nonlinearity caused by capacitor mismatches. The ADC has a front-end Sample-and-hold(SH) circuit, followed by 13 1.5 bit/stage sub-ADC and 2 bit flash ADC at last. Test results show that, with a 140 MHz input and 200 MHz sampling rate, the SIAND is improved from 59 dB to 66 dB and SFDR is improved from 62 dBc to 82 dBc with the digital calibration. The measured SFDR reaches 77 dBc even at 250 MSps after calibration. The total power dissipation is 398 mW at 250 MSps including the parallel Low voltage differential signal(LVDS) output drivers.

关键词： Pipelined Analog-to-digital converter(ADC) Capacitor mismatch Digital self-calibration