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A Bayesian Filtering Approach for Tracking Sympathetic Arousal and Cortisol-Related Energy From Marked Point Process and Continuous-Valued Observations

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IEEE ACCESS 2023年 11卷 137204-137247页

作者： Wickramasuriya, Dilranjan S. Khazaei, Saman Kiani, Roozbeh Faghih, Rose T. Univ Houston Dept Elect & Comp Engn Houston TX 77004 USA NYU Tandon Sch Engn Dept Biomed Engn New York NY 10010 USA NYU Dept Psychol New York NY 10003 USA

Multiple state variables governed by internal processes within the human body remain unobserved. On a number of occasions, these states are linked to point process bioelectric and biochemical observations coupled together with continuous-valued variables. These observations provide a means to estimate the latent states of interest. We develop a state-space method to estimate unobserved sympathetic arousal and energy production states from skin conductance and cortisol data respectively, comprising of a marked point process and a continuous-valued observation. The method involves Bayesian filtering applied within an expectation-maximization (EM) framework for state estimation and model parameter recovery. Results are evaluated on both simulated and experimental data. On experimental skin conductance data, high arousal levels are generally detected during cognitive stress periods and lower values are detected during relaxation. Results are also in conformity with general physiology for cortisol data. On separate experimental data, skin conductance-based estimates are validated/cross-checked with functional Near Infrared Spectroscopy features. Estimation is also performed on heart rate and skin conductance data to illustrate the method's wider applicability. We also compare the method with earlier approaches. We show how it outperforms a previous method for cortisol-based energy estimation, and its superiority to earlier methods for estimating sympathetic arousal. The EM approach is thus able to estimate latent physiological states within the body from point process bioelectric and biochemical phenomena. The method could be applied in wearable monitoring and automated closed-loop therapy delivery for patients diagnosed with certain types of neuropsychiatric or hormone disorders.

关键词： Emotion recognition Physiology Blood Estimation computer aided software engineering Bayes methods Biomedical signal processing State-space methods Kalman filters state-space methods estimation emotion recognition

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Spatially Variant Filtering Network Based on Generalized Optimal Constraints for Sidelobe Suppression in SAR Images

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IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 2024年 62卷

作者： Suo, Yuxi Fu, Kun Wu, Youming Meng, Qingbiao Miao, Tian Diao, Wenhui Sun, Xian Chinese Acad Sci Aerosp Informat Res Inst Beijing 100190 Peoples R China Chinese Acad Sci Key Lab Network Informat Syst Technol NIST Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Elect Elect & Commun Engn Beijing 100190 Peoples R China

Sidelobes commonly disturb synthetic aperture radar (SAR) image understanding and interpretation. Traditional spatially variant filtering algorithms achieve a superior tradeoff between sidelobe suppression and resolution preservation by means of adaptively calculating filtering parameters under some specific restrictions, such as filter design restriction and minimum amplitude constraint (MAC). These restriction aims to obtain an efficient analytical solution for filters, which is easy to calculate under unsupervised conditions. However, the restriction scope is so narrow that the suppression performance achieved by these filters is limited. Also, since the unsupervised optimization based on MAC indiscriminately minimizes amplitude, the main-lobe loss is unavoidable. To further improve the performance, a spatially variant convolution neural network (SVNN) is proposed, which consists of two core modules. One is the spatially variant filter generation (SVFG) module, adaptively generating superior spatially variant filters under more relaxed restrictions. The other is a paralleled shifted convolution (PSC) module, converting the signal format to achieve a fast and parallel spatially variant filtering process. Benefiting from more relaxed filter restrictions, the novel network successfully achieves better performance on sidelobe suppression. In addition, with supervised optimization based on another more accurate restriction, namely, minimum error constraint (MEC), the proposed algorithm also achieves superior main-lobe maintenance. All of them are validated by comparative experiments based on satellite data from GaoFen-3 and TerraSAR-X, and our proposed method achieves state-of-the-art performance. The entire project is available at https://***/suoyuxi/SVNN.

关键词： Optimization Signal processing algorithms Radar polarimetry Maintenance Synthetic aperture radar Signal resolution Convolutional neural networks computer aided software engineering Spatial resolution Solids Deep learning sidelobe suppression spatially variant filtering synthetic aperture radar (SAR)

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Expression of worst case using multivariate analysis in MOSFET model parameters

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IEEE TRANSACTIONS ON SEMICONDUCTOR MANUFACTURING 1998年第4期11卷 569-574页

作者： Yasuda, T Kawashima, H Hori, S Tanizawa, M Yamawaki, M Asai, S Mitsubishi Elect Corp ULSI Lab Itami Hyogo 664 Japan Mitsubishi Elect Corp Mfg Engn Ctr Amagasaki Hyogo 661 Japan

Device and circuit performance such as drain current and delay time varies stochastically due to uncontrollable factors in the fabrication processes. In this paper, a new method that represents the variation of the performance as worst case parameters in a MOSFET model is proposed. The variation of the performance can be expressed as a linear combination of several process-related parameters of the MOSFET model. Because of this fact, the worst case of parameters which corresponds to the worst case of performance can be directly and uniformly determined. Therefore, the calculation time of worst case parameters can be reduced by this method. The worst case parameter sets calculated by this method enable designers to estimate circuit performance variations accurately and easily. The capability of this method is verified in the variation analysis of drain current.

关键词： computer aided software engineering MOSFET circuits Circuit simulation Delay effects Performance analysis Circuit optimization Fabrication Design methodology Semiconductor devices Capacitance

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Survivable network system analysis: A case study

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IEEE software 1999年第4期16卷 70-77页

作者： Ellison, RJ Linger, RC Longstaff, T Mead, NR Carnegie Mellon Univ Inst Software Engn Networked Syst Survivabil Program Pittsburgh PA 15213 USA

Critical systems must be able to with stand attacks, failures, and accidents with acceptable levels of information integrity. A four-step method has been developed for analyzing survivability in distributed systems. T... 详细信息

关键词： computer aided software engineering Failure analysis computer architecture Accidents Information analysis Application software Large-scale systems Medical services Maintenance Fault tolerance

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A nonlinear analytical model for the quantized LMS algorithm - The power-of-two step size case

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 1996年第11期44卷 2895-2900页

作者： Bershad, NJ Bermudez, JCM UNIV FED SANTA CATARINA DEPT ELECT ENGNBR-88040900 FLORIANOPOLISSCBRAZIL

This correspondence presents a study of the quantization effects in the finite precision LMS algorithm with power-of-two step sizes, Deterministic nonlinear recursions are presented for the mean and second-moment matrix of the weight vector about the Wiener weight for white Gaussian data models and small algorithm step size mu. The numerical solutions of these recursions are shown to agree very closely with the Monte Carlo simulations during an phases of the adaptation process. Design examples demonstrate the selection of the number of quantizer bits and the adaptation step size mu to yield a desired transient behavior and cancellation performance. The results obtained indicate that previous models are too conservative in predicting the converged MSE for a given number of bits.

关键词： Analytical models Least squares approximation computer aided software engineering Equations Quantization Data models Process design Predictive models Adaptive filters Fixed-point arithmetic

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WORST-CASE SYSTEM-IDENTIFICATION IN H-INFINITY - VALIDATION OF A-PRIORI INFORMATION, ESSENTIALLY OPTIMAL-ALGORITHMS, AND ERROR-BOUNDS

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IEEE TRANSACTIONS ON AUTOMATIC CONTROL 1995年第7期40卷 1260-1265页

作者： CHEN, J NETT, CN FAN, MKH GEORGIA INST TECHNOL SCH ELECT & COMP ENGNATLANTAGA 30332 UNITED TECHNOL RES CTR E HARTFORDCT 06108

In this paper we resolve several important open issues pertaining to a worst-case control-oriented system identification problem known as identification In H-infinity. First, a method Is presented for developing confidence that certain a priori information available for identification is not invalid. This method requires the solution of a certain nondifferentiable convex program. Second, an essentially optimal identification algorithm is constructed. This algorithm is (worst-case strongly) optimal to within a factor of two. Finally, new upper and lower bounds on the optimal identification error are derived and used to estimate the identification error associated with the given algorithm. Interestingly, the development of each of these results draws heavily upon the classical Nevanlinna-Pick interpolation theory. As such, our results establish a clear link between the areas of system identification and optimal interpolation theory. Both the formulation and techniques in this paper are applicable to problems where the frequency data available for identification may essentially be arbitrarily distributed.

关键词： computer aided software engineering System identification Robust stability Uncertain systems Robustness Linear systems Feedback Polynomials Robust control System testing

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DEVELOPING PROFESSIONALISM IN THE ELECTRICAL-engineering CLASSROOM

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IEEE TRANSACTIONS ON EDUCATION 1991年第2期34卷 149-154页

作者： COOLEY, WL KLINKHACHORN, P MCCONNELL, RL MIDDLETON, NT COLORADO SCH MINES DEPT ENGNGOLDENCO 80401

This paper describes an integrated activity in engineering ethics and responsibility extending over three class periods in an electrical engineering senior seminar. The activity begins by having the students discuss (using role play) and choose a course of action with respect to a consumer safety product. The choices involve a tradeoff between product cost (and resulting market attractiveness) and the level of safety provided. After they make their decision, we surprise them with a civil court trial, in which they are challenged by a "plaintiff's attorney" to justify their decisions in an adversarial atmosphere. A great deal of interest is generated because the role play becomes real, in the sense that they are called on to defend their actual decisions, rather than reviewing the words and actions of others. They also learn about tort law and liability. Students often describe the mock court class as "the best I ever had in engineering."

关键词： Ethics Product safety Accidents Electrical engineering Seminars Costs Sparks Product liability computer aided software engineering Manufacturing

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Truth Discovery by Claim and Source Embedding

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IEEE TRANSACTIONS ON KNOWLEDGE AND DATA engineering 2021年第3期33卷 1264-1275页

作者： Lyu, Shanshan Ouyang, Wentao Wang, Yongqing Shen, Huawei Cheng, Xueqi Chinese Acad Sci CAS Key Lab Network Data Sci & Technol Inst Comp Technol Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Information gathered from multiple sources on the Web often exhibits conflicts. This phenomenon motivates the need of truth discovery, which aims to automatically find the true claim among multiple conflicting claims. Existing truth discovery methods are mainly based on iterative updates, optimization or probabilistic models. Although these methods have shown their own effectiveness, they have a common limitation. These methods do not model relationships between each pair of source and target such that they do not well capture the underlying interactions in the data. In this paper, we propose a new model for truth discovery, learning the representations of sources and claims automatically from the interactions between sources and targets. Our model first constructs a heterogenous network including source-claim, source-source and truth-claim relationships. It then embeds the network into a low dimensional space such that trustworthy sources and true claims are close. In this way, truth discovery can be conveniently performed in the embedding space. Moreover, our model can be implemented in both semi-supervised and un-supervised manners to deal with the label scarcity problem in practical truth discovery. Experiments on three real-world datasets demonstrate that our model outperforms existing state-of-the-art methods for truth discovery.

关键词： Reliability Object oriented modeling Iterative methods Probabilistic logic Data science computer aided software engineering Data models Truth discovery crowdsourcing representation learning

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An algorithm of the method of sections and program tools for constructing reachable sets of nonlinear control systems

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JOURNAL OF computer AND SYSTEMS SCIENCES INTERNATIONAL 2008年第1期47卷 1-7页

作者： Morzin, O. V. Tyatyushkin, A. I. Inst Dynam Syst & Control Theory Irkutsk Russia

The method of sections for constructing reachable sets of nonlinear control systems with constraints on the control and system state is considered. The proposed algorithms are based on the application of complexes of programs whose functional content contains methods for calculating an optimal control for various constraints on control and system coordinates. The problems of many-processor computing technology are discussed and the results of numerical experiments are presented.

关键词： computer aided software engineering

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computer-aided-DESIGN - A CASE OF STRATEGY IN IMPLEMENTING A NEW TECHNOLOGY

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IEEE TRANSACTIONS ON engineering MANAGEMENT 1989年第3期36卷 191-201页

作者： FORSLIN, J THULESTEDT, BM ANDERSSON, S SWEDISH CONFEDERAT PROFESS EMPLOYEES CODETERMINAT WORK ORG & TECHNOLS-10245 STOCKHOLMSWEDEN SWEDISH INST PROD ENGN RES S-41285 GOTHENBURGSWEDEN

A case study analyzed the introduction of computer-aided design (CAD) in a Swedish engineering company. The focus was on the process of change and the repercussions of the new technology on work organization and communication patterns within the company. Data were collected by formal interviews, informal talks, surveys, and observations. The designers had received the new technology favorably and were impatient about the pace of change. However, the introduction of CAD had less than desirable effects on the work situation of the designers and on the cooperation with other functions that had been envisaged, since the development of the system was limited to a small group close to the design management. The study confirmed that CAD will have little effect on a bureaucratic organization unless the change is included as an explicit objective. A joint forum for outlining a strategy is needed for the full utilization of any new technology.

关键词： Design automation computer aided software engineering computer aided manufacturing CADCAM Production systems Flexible manufacturing systems Councils computer aided instruction computer industry Design engineering

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