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      • SCIESCOPUSKCI등재

        PGA: An Efficient Adaptive Traffic Signal Timing Optimization Scheme Using Actor-Critic Reinforcement Learning Algorithm

        Shen,,Si,Shen,,Guojiang,Shen,,Yang,Liu,,Duanyang,Yang,,Xi,Kong,,Xiangjie Korean Society for Internet Information 2020 KSII Transactions on Internet and Information Syst Vol.14 No.11

        Advanced traffic signal timing method plays very important role in reducing road congestion and air pollution. Reinforcement learning is considered as superior approach to build traffic light timing scheme by many recent studies. It fulfills real adaptive control by the means of taking real-time traffic information as state, and adjusting traffic light scheme as action. However, existing works behave inefficient in complex intersections and they are lack of feasibility because most of them adopt traffic light scheme whose phase sequence is flexible. To address these issues, a novel adaptive traffic signal timing scheme is proposed. It's based on actor-critic reinforcement learning algorithm, and advanced techniques proximal policy optimization and generalized advantage estimation are integrated. In particular, a new kind of reward function and a simplified form of state representation are carefully defined, and they facilitate to improve the learning efficiency and reduce the computational complexity, respectively. Meanwhile, a fixed phase sequence signal scheme is derived, and constraint on the variations of successive phase durations is introduced, which enhances its feasibility and robustness in field applications. The proposed scheme is verified through field-data-based experiments in both medium and high traffic density scenarios. Simulation results exhibit remarkable improvement in traffic performance as well as the learning efficiency comparing with the existing reinforcement learning-based methods such as 3DQN and DDQN.

      • SCIESCOPUSKCI등재후보

        Thermal postbuckling of imperfect Reissner-Mindlin plates with two free side edges and resting on elastic foundations

        Shen,,Hui-Shen Techno-Press 1998 Structural Engineering and Mechanics, An Int'l Jou Vol.6 No.6

        A thermal postbuckling analysis is presented for a moderately thick rectangular plate subjected to uniform or nonuniform tent-like temperature loading and resting on an elastic foundation. The plate is assumed to be simply supported on its two opposite edges and the two side edges remain free. The initial geometrical imperfection of the plate is taken into account. The formulation are based on the Reissner-Mindlin plate theory considering the first order shear deformation effect, and including plate-foundation interaction and thermal effects. The analysis uses a mixed Galerkin-perturbation technique to determine the thermal buckling loads and postbuckling equilibrium paths. Numerical examples are presented that relate to the performances of perfect and imperfect, moderately thick plates resting on Pasternak-type or softening nonlinear elastic foundations from which results for Winker elastic foundations follow as a limiting case. Typical results are presented in dimensionless graphical form.

      • AHCISCOPUS

        CONTENTS : ARTICLES ; Academia and Cultural Production: Yu Dan and Her Confucius from the Heart: Ancient Wisdom for Today`s World

        ( Shen Shen Cai ) 성균관대학교 동아시아학술원 2015 Sungkyun Journal of East Asian Studies Vol.15 No.1

        Chinese professor Yu Dan and her book Yu Dan Lunyu xinde, (Confucius from the Heart: Ancient Wisdom for Today's World), became an immediate cultural success, contributing to the promotion and the popularity of people's interest in the Chinese classics and national studies. As a work which bears the marks of both Confucian ideology and popular Confucian cultural traits, the Yu Dan phenomenon captures the development of the national studies craze, in particular those areas relevant to Confucian ideas and principles in contemporary China. Yu Dan's popularity indicates a recent revival of ancient Chinese cultural, philosophical, and moral traditions in their relationship with modern Chinese society, and their use by contemporary Chinese people. This article analyses the development of the Yu Dan phenomenon and the intense debate it has stimulated, reviewing its subtle collaboration with official discourse and propaganda, and its success as a cultural product. It also analyses the role the Yu Dan phenomenon plays in changing the social status and functions of intellectuals in the contemporary Chinese political-social-cultural milieu.

      • SCIESCOPUSKCI등재후보

        CRISPR as a strong gene editing tool

        Shen,,Shengfu,Loh,,Tiing,Jen,Shen,,Hongling,Zheng,,Xuexiu,Shen,,Haihong Korean Society for Biochemistry and Molecular Biol 2017 BMB Reports Vol.50 No.1

        Clustered regularly-interspaced short palindromic repeats (CRISPR) is a new and effective genetic editing tool. CRISPR was initially found in bacteria to protect it from virus invasions. In the first step, specific DNA strands of virus are identified by guide RNA that is composed of crRNA and tracrRNA. Then RNAse III is required for producing crRNA from pre-crRNA. In The second step, a crRNA:tracrRNA:Cas9 complex guides RNase III to cleave target DNA. After cleavage of DNA by CRISPR-Cas9, DNA can be fixed by Non-Homologous End Joining (NHEJ) and Homology Directed Repair (HDR). Whereas NHEJ is simple and random, HDR is much more complex and accurate. Gene editing by CRISPR is able to be applied to various biological field such as agriculture and treating genetic diseases in human.

      • SCIESCOPUSKCI등재후보

        Thermomechanical postbuckling of imperfect moderately thick plates on two-parameter elastic foundations

        Shen,,Hui-Shen Techno-Press 1996 Structural Engineering and Mechanics, An Int'l Jou Vol.4 No.2

        A postbuckling analysis is presented for a simply supported, moderately thick rectangular plate subjected to combined axial compression and uniform temperature loading and resting on a two-parameter elastic foundation. The two cases of thermal postbuckling of initially compressed plates and of compressive postbuckling of initially heated plates are considered. The initial geometrical imperfection of the plate is taken into account. The formulations are based on the Reissner-Mindlin plate theory considering the first order shear deformation effect, and including the plate-foundation interaction and thermal effect. The analysis uses a deflection-type perturbation technique to determine the buckling loads and postbuckling equilibrium paths. Numerical examples cover the performances of perfect and imperfect, moderately thick plates resting on Winkler or Pasternak-type elastic foundations. Typical results are presented in dimensionless graphical form.

      • Assessment of negative Poisson's ratio effect on thermal post-buckling of FG-GRMMC laminated cylindrical panels

        Shen,,Hui-Shen,Xiang,,Y. Techno-Press 2021 Advances in nano research Vol.10 No.5

        This paper examines the thermal post-buckling behaviors of graphene-reinforced metal matrix composite (GRMMC) laminated cylindrical panels which possess in-plane negative Poisson's ratio (NPR) and rest on an elastic foundation. A panel consists of GRMMC layers of piece-wise varying graphene volume fractions to obtain functionally graded (FG) patterns. Based on the MD simulation results, the GRMMCs exhibit in-plane NPR as well as temperature-dependent material properties. The governing equations for the thermal post-buckling of panels are based on the Reddy's third order shear deformation shell theory. The von Karman nonlinear strain-displacement relationship and the elastic foundation are also included. The nonlinear partial differential equations for GRMMC laminated cylindrical panels are solved by means of a singular perturbation technique in associate with a two-step perturbation approach and in the solution process the boundary layer effect is considered. The results of numerical investigations reveal that the thermal post-buckling strength for (0/90)<sub>5T</sub> GRMMC laminated cylindrical panels can be enhanced with an FG-X pattern. The thermal post-buckling load-deflection curve of 6-layer (0/90/0)<sub>S</sub> and (0/90)<sub>3T</sub> panels of FG-X pattern are higher than those of 10-layer (0/90/0/90/0)<sub>S</sub> and (0/90)<sub>5T</sub> panels of FG-X pattern.

      • KCI등재SCOPUS

        CRISPR as a strong gene editing tool

        ( Shengfu Shen ), ( Tiing Jen Loh ), ( Hongling Shen ), ( Xuexiu Zheng ), ( Haihong Shen ) 생화학분자생물학회(구 한국생화학분자생물학회) 2017 BMB Reports Vol.50 No.1

        Clustered regularly-interspaced short palindromic repeats (CRISPR) is a new and effective genetic editing tool. CRISPR was initially found in bacteria to protect it from virus invasions. In the first step, specific DNA strands of virus are identified by guide RNA that is composed of crRNA and tracrRNA. Then RNAse III is required for producing crRNA from pre-crRNA. In The second step, a crRNA:tracrRNA:Cas9 complex guides RNase III to cleave target DNA. After cleavage of DNA by CRISPR-Cas9, DNA can be fixed by Non- Homologous End Joining (NHEJ) and Homology Directed Repair (HDR). Whereas NHEJ is simple and random, HDR is much more complex and accurate. Gene editing by CRISPR is able to be applied to various biological field such as agriculture and treating genetic diseases in human. [BMB Reports 2017; 50(1): 20-24]

      • KCI등재

        Nonlinear vibration of microtubules in living cells

        Hui-Shen,Shen 한국물리학회 2011 Current Applied Physics Vol.11 No.3

        Large amplitude flexural vibration behavior is presented for microtubules (MTs) embedded in an elastic matrix of cytoplasm. The microtubule is modeled as a nonlocal shear deformable cylindrical shell which contains small scale effect. The surrounding elastic medium is modeled as a two-parameter elastic foundation. Formulations are based on higher order shear deformation shell theory with a von Kármán-Donnelltype of kinematic nonlinearity. The thermal effect is also included and the material properties are assumedto be temperature-dependent. The small scale parameter e_0a is estimated by matching the fundamental frequencies from existing results with the numerical results obtained from the nonlocal shear deformable shell model. The numerical results show that the fundamental frequencies of MTs are very sensitive to the small scale parameter e_0a. The results reveal that the small scale parameter e_0a reduces the natural frequencies of MTs, but the effect of the small scale parameter on the nonlinear vibration response is relativelyweakerwhen compared to the effect of thesmall scale parameter on the postbuckling response of MTs.

      • KCI등재SCOPUS

        PGA: An Efficient Adaptive Traffic Signal Timing Optimization Scheme Using Actor-Critic Reinforcement Learning Algorithm

        ( Si Shen ), ( Guojiang Shen ), ( Yang Shen ), ( Duanyang Liu ), ( Xi Yang ), ( Xiangjie Kong ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.11

        Advanced traffic signal timing method plays very important role in reducing road congestion and air pollution. Reinforcement learning is considered as superior approach to build traffic light timing scheme by many recent studies. It fulfills real adaptive control by the means of taking real-time traffic information as state, and adjusting traffic light scheme as action. However, existing works behave inefficient in complex intersections and they are lack of feasibility because most of them adopt traffic light scheme whose phase sequence is flexible. To address these issues, a novel adaptive traffic signal timing scheme is proposed. It's based on actor-critic reinforcement learning algorithm, and advanced techniques proximal policy optimization and generalized advantage estimation are integrated. In particular, a new kind of reward function and a simplified form of state representation are carefully defined, and they facilitate to improve the learning efficiency and reduce the computational complexity, respectively. Meanwhile, a fixed phase sequence signal scheme is derived, and constraint on the variations of successive phase durations is introduced, which enhances its feasibility and robustness in field applications. The proposed scheme is verified through field-data-based experiments in both medium and high traffic density scenarios. Simulation results exhibit remarkable improvement in traffic performance as well as the learning efficiency comparing with the existing reinforcement learning-based methods such as 3DQN and DDQN.

      • SCIESCOPUSKCI등재

        A Robust Dynamic Decoupling Control Scheme for PMSM Current Loops Based on Improved Sliding Mode Observer

        Shen,,Hanlin,Luo,,Xin,Liang,,Guilin,Shen,,Anwen The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6

        A complete current loop decoupling control strategy based on a sliding mode observer (SMO) is proposed to eliminate the influence of current dynamic coupling and back electromotive force (EMF) in the vector control of permanent magnet synchronous motors. With this strategy, current dynamic decoupling and back EMF compensation can be simultaneously achieved. Unlike conventional methods, the proposed strategy can avoid the disturbances caused by the parametric variations of motor systems and maintain the advantages of proportional integral (PI) controllers, which are robust and easy to operate. An improved SMO, which uses a special PI regulator other than a linear saturation function as the equivalent control law in the boundary layer of a sliding surface, is proposed to eliminate the estimated errors caused by the quasi-sliding mode and obtain a satisfactory decoupling performance. The stability and parameter robustness of the proposed strategy are also analyzed. Physical experimental results are presented to verify the validity of the method.

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