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Minimum energy optimal external torque control of human binocular vision

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Control Theory and Technology 2020年第4期18卷 431-458页

作者： bijoy k.ghosh Bhagya Athuk.rallage Department of Mathematics and Statistics Texas Tech UniversityLubbockTX 79409-1042USA School of Automation Engineering University of Electronic Science and Technology of ChinaChengduSichuan 610054China

In this paper,we consider eyes from the human binocular system,that simultaneously gaze on stationary point targets in space,while optimalal sk.pping from one target to the next,by rotaing their individual gaze *** head is assume fixed on the torso and the rotaing gaze direction of the two eyes are assumed restricted to pass through a point in the visual *** is further assumed that,individullly the rotations of the two eyes satisfy the well k.own Listing's *** formulate and study acombined optimal gaze rotation for the two eyes,by constructing a single Riemanmian metric,on the asociaced parameter *** goal is to optimally rotate so that the convergent gaze changes between two pre-specified target points in a finite time interval[0,1].The cost function we choose is the total energy,measured by the L2?norm,of the six extenal torques on the binocular *** torque functions are synthesized by solving an associated*two-point boundary value *** paper demonstrates,via simulation,the shape of the optimal gaze trajectory of the focused point of the bin-ocular *** Euclidean distance between the initial and the final point is compared to the arc:length of the optimal *** consumed *** computed for diferent eye movement chores and discussed in the *** simulation we observe that certain eye movement maneuvers are energy fficicnt and demonstrate that the optimal external torque is a linear function in *** also explore and conclude that spitting an arbitry opimal eye movement into optimal vergence and version components is not energy fficient although this is how the human oculomotor control seems to *** gaze tajectories and opimal extermal torque functions reported in this paper is new.

关键词： Binocular vision Riemamian gcometry Optimal control Human eye movement

Safe formation control of multiple unmanned aerial vehicles:control design and safety-stability analysis

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Control Theory and Technology 2024年第3期22卷 442-454页

作者： Haoqi Li Jiangping Hu Qingrui Zhou bijoy k.ghosh School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313000ZhejiangChina Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing 100094China Department of Mathematics and Statistics Texas Tech UniversityLubbockTX 79409-1042USA

Both safety and stability are primary performance criteria for multi-unmanned aerial vehicle(multi-UAV)systems in many coordination *** approaches often consider safety and stability *** is necessary and urgent to develop a safety-stability control strategy to merge these two performance *** this paper,a unified approach is developed to consider safety and stability for multi-UAV formation *** stability criterion is represented by a Lyapunov function and safety criterion is represented by a barrier function and then a relaxed converse control Lyapunov-barrier theorem is *** the help of a relaxed converse control Lyapunov-barrier function(RCCLBF),a distributed safety-stability formation control strategy is proposed for the multi-UAV *** transforming the solution of RCCLBF to a Lyapunovlik. stabilization problem,we show that the proposed formation control strategy can drive the UAVs staying within a specified safe *** results are provided to validate the proposed safety-stability formation control strategy.

关键词： Multi-UAV system Formation control Lyapunov function Barrier function Stability with safety guarantee

Distributed multi-agent temporal-difference learning with full neighbor information

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Control Theory and Technology 2020年第4期18卷 379-389页

作者： Zhinan Peng Jiangping Hu Rui Luo bijoy k.ghosh School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Department of Mathematics and Statistics Texas Tech UniversityLubbockTX 79409-1042USA

This paper presents a novel distributed multi-agent temporal-difference learning framework.for value function approximation,which alows agents using all the neighbor information instead of the information from only one *** full neighbor information,the proposed framework.1)has a faster convergence rate,and(2)is more robust compared to the state of-the art *** we propose a distributed multi-agent discounted temporal dfferene algorithm and a distributed muli-agent average cost temporal diference leaming algorithm based on th ***,the two proposed algorthms'theoretical convergence proofs are *** simulation resuts show that our proposed algorihms are superior to the gossip-based algorithm in convergence speed,robustness to noise and time-varying network.topology.

关键词： Distributed algorithm Reinforcement learning Temprel-lifferene learning Multi-agent systems

A survey on sensor localization

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控制理论与应用（英文版） 2010年第1期8卷 2-11页

作者： Jing WANG R. k. ghosh Sajal k. DAS Center for Research in Wireless Mobility and Network.ng (CReWMaN) Department of Computer Science and Engineering University of Texas at Arlington Arlington TX 76019 USA Department of Computer Science and Engineering Indian Institute of Technology Kanpur India 208016

Localization is one of the fundamental problems in wireless sensor network. （WSNs）, since locations of the sensor nodes are critical to both network.operations and most application level task.. Although the GPS based localization schemes can be used to determine node locations within a few meters, the cost of GPS devices and non-availability of GPS signals in confined environments prevent their use in large scale sensor network.. There exists an extensive body of research that aims at obtaining locations as well as spatial relations of nodes in WSNs without requiring specialized hardware and/or employing only a limited number of anchors that are aware of their own locations. In this paper, we present a comprehensive survey on sensor localization in WSNs covering motivations, problem formulations, solution approaches and performance summary. Future research issues will also be discussed.

关键词： Sensor localization Wireless sensor network. Range measurements Anchors Mobile sensor Proba-bilistic localization

Influence of Cold Deformation on the Aging Behaviour of Al-Cu-Si-Mg Alloy

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Journal of Materials Science & Technology 2011年第3期27卷 193-198页

作者： S.k.ghosh Department of Metallurgy and Materials Engineering Bengal Engineering and Science University

The present study deals with the effect of cold deformation and subsequent aging on the microstructure and mechanical properties of AI-Cu-Si-Mg alloy. Differential scanning calorimetry indicates that precipitation occurs in the temperature range of 258-272℃ for the as quenched wrought alloy. The activation energy value estimated by k.ssinger method for the aforesaid precipitation reaction is obtained as 106 k./mol. 45% cold deformation prior to aging indicates the first dissolution reaction at about 50℃ and the precipitation reaction at a temperature of about 82℃. Microstructural investigations have revealed the formation of fine precipitates within the matrix after aging of the cold deformed sample. As-quenched alloy reveals prominently the aging response, The increase in hardness, yield and tensile strength with simultaneous decrease in elongation in the deformed alloy is found to be primarily due to the deformation strengthening and not due to the precipitation hardening.

关键词： Aluminium alloy Aging Cold deformation Differential scanning calorimetry k.ssinger method

SYNCHRONIZATION IN A RING OF UNIDIRECTIONALLY COUPLED FITZHUGH-NAGUMO NEURONS

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International Journal of Biomathematics 2014年第1期7卷 161-171页

作者： ANINDITA BHATTACHARJEE M. k. DAS SUBHENDU ghosh Galgotia Institute of Management and Technology Greater Noida UP 201306 India Institute of Informatics and Communication University of Delhi South CampusBenito-Juarez Road New Delhi 110021 India Department of Biophysics University of Delhi South Campus Benito-Juarez Road New Delhi 110021 India

Synchronization behavior of an ensemble of unidirectionally coupled neurons with a constant input is investigated. Chemical synapses are considered for coupling. Each neuron is also considered to be exposed to a self-delayed feedback. The synchronization phenomenon is analyzed by the error dynamics of the response trajectories of the system. The effect of various model parameters e.g. coupling strength, feedback.gain and time delay, on synchronization is also investigated and a measure of synchrony is computed in each cases. It is shown that the synchronization is not only achieved by increasing the coupling strength, the system also required to have a suitable feedback.gain and time delay for synchrony. Robustness of the parameters for synchrony is verified for larger systems.

关键词： Unidirectionally coupled chemical synapse self-delayed feedback synchrony measure.

Data-Driven Approaches for Spatio-Temporal Analysis:A Survey of the State-of-the-Arts

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Journal of Computer Science & Technology 2020年第3期35卷 665-696页

作者： Monidipa Das Soumya k.ghosh School of Computer Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Computer Science and Engineering Indian Institute of Technology KharagpurKharagpur 721302India

With the advancement of telecommunications,sensor network.,crowd sourcing,and remote sensing technology in present days,there has been a tremendous growth in the volume of data having both spatial and temporal *** huge volume of available spatio-temporal(ST)data along with the recent development of machine learning and computational intelligence techniques has incited the current research concerns in developing various data-driven models for extracting useful and interesting patterns,relationships,and k.owledge embedded in such large ST *** this survey,we provide a structured and systematic overview of the research on data-driven approaches for spatio-temporal data *** focus is on outlining various state-of-the-art spatio-temporal data mining techniques,and their applications in various *** start with a brief overview of spatio-temporal data and various challenges in analyzing such data,and conclude by listing the current trends and future scopes of research in this multi-disciplinary *** with other relevant surveys,this paper provides a comprehensive coverage of the techniques from both computational/methodological and application *** anticipate that the present survey will help in better understanding various directions in which research has been conducted to explore data-driven modeling for analyzing spatio-temporal data.

关键词： data-driven modeling spatio-temporal data prediction change pattern detection outlier detection hotspot detection partitioning/summarization (tele-)coupling visual analytics

Improvement of warm formability of Al-Mg sheet alloys containing coarse second-phase particles

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Science China(Technological Sciences) 2009年第1期52卷 41-45页

作者： Arne k.DAHLE Amit k.ghosh Materials Engineering University of Queensland Department of Materials Science and Engineering University of Michigan

Several alloying elements involving Zr, Cu, Zn and Sc were added to Al-Mg sheet alloys in order to obtain an excellent combination of high strength and good high-temperature formability. Microstruc-tural examination showed that coarse intermetallic particles were formed in the microstructure and their amounts changed with variations of the alloying elements. During warm rolling of thermome-chanical treatments prior to warm deformation, the coarse particles initiated crack., decreasing the warm formability. For healing the crack.damage and further improving the warm formability, a process of hot isothermal press was developed and optimized to the sheet alloys. With this process, the biaxial stretch formability at 350℃ was improved by 22% for an aluminum alloy containing a large amount of coarse particles.

关键词： aluminum alloy microstructure second-phase particle hot isothermal press high-temperature formability

DEAD-box RNA helicases with special reference to p68:Unwinding their biology,versatility,and therapeutic opportunity in cancer

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Genes & Diseases 2023年第4期10卷 1220-1241页

作者： Shaheda Tabassum Mrinal k.ghosh Cancer Biology and Inflammatory Disorder Division Council of Scientific and Industrial Research-Indian Institute of Chemical Biology(CSIR-IICB)TRUE CampusSalt LakeKolkata 700091India

In the era of advancement,the entire world continues to remain baffled by the increased rate of progression of *** has been an unending search for novel thera-peutic targets and prognostic mark.rs to curb the oncogenic *** DEAD-box RNA he-licases are a large family of proteins characterized by their evolutionary conserved D-E-A-D(Asp-Glu-Ala-Asp)domain and merit consideration in the oncogenic *** perform multidimensional functions in RNA metabolism and also in the pathology of *** bio-logical role ranges from ribosome biogenesis,RNA unwinding,splicing,modification of second-ary and tertiary RNA structures to acting as transcriptional coactivators/repressors of various important oncogenic *** also play a crucial role in accelerating oncogenesis by pro-moting cell proliferation and ***5(p68)is one of the archetypal members of this family of proteins and has gained a lot of attention due to its oncogenic *** is found to be overexpressed in major cancer types such as colon,brain,breast,and prostate *** exhibits its multifaceted nature by not only coactivating genes implicated in cancers but also mediating crosstalk.across major signaling pathways in ***,in this review,we aim to illustrate a comprehensive overview of DEAD-box RNA helicases especially p68 by focusing on their multifaceted roles in different cancers and the various signaling pathways affected by ***,we have also briefly discoursed the therapeutic interventional approaches with the DEAD-box RNA helicases as the pharmacological targets for designing in-hibitors to pave way for cancer therapy.

关键词： Cancer DDX5 DEAD-box RNA helicases Gene expression Oncogene Signaling Therapy Transcription factor