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Journal of Central South University 2013年第9期20卷 2440-2446页

作者： lee sang-hyuk SHIN Seung-soo Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University Department of Information Security Tongmyong University

Similarity measure design on non-overlapped data was carried out and compared with the case of overlapped *** feature of similarity on overlapped data to non-overlapped data was provided by *** the artificial data illustration,it was proved that the conventional similarity measure was not proper to calculate the similarity measure of the non-overlapped *** overcome the unbalance problem,similarity measure on non-overlapped data was obtained by considering neighbor ***,different approaches to design similarity measure were proposed and proved by consideration of neighbor *** the example of artificial data,similarity measure calculation was carried *** measure extension to intuitionistic fuzzy sets(IFSs)containing uncertainty named hesitance was also followed.

关键词： similarity measure overlapped data non-overlapped data intuitionistic data

A multi-input and multi-output design on automotive engine management system

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Journal of Central South University 2015年第12期22卷 4687-4692页

作者：翟禹嘉孙研钱科军 lee sang-hyuk Department of Electrical and Electronic Engineering Xi’an Jiaotong-Liverpool University Centre for Smart Grid and Information Convergence Xi’an Jiaotong-Liverpool University International Business School Suzhou Xi’an Jiaotong-Liverpool University Suzhou Power Supply Company

Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotive engine management system(EMS).Usually,an ECU has a structure of multi-input and single-output(MISO).Therefore,if there are multiple objectives proposed in EMS,there would be corresponding numbers of ECUs that need to be *** this situation,huge efforts and time were spent on *** this work,a multi-input and multi-out(MIMO) approach based on model predictive control(MPC) was presented for the automatic cruise system of automotive *** results show that the tracking of engine speed command and the regulation of air/fuel ratio(AFR) can be achieved simultaneously under the new *** mean absolute error(MAE) for engine speed control is 0.037,and the MAE for air fuel ratio is 0.069.

关键词： neural network spark-ignition engine dynamical system modeling system identification multi-input and mult-output(MIMO) control system

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Journal of Central South University 2013年第4期20卷 982-987页

作者： lee Myeong-ho 魏荷 lee sang-hyuk lee sang-min SHIN Seung-soo Department of e-Commerce Semyung University Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University Institute for Information and Electronics Research Inha University Department of Information Security Tongmyung University

Similarity measure design for discrete data group was proposed. Similarity measure design for continuous membership function was also carried out. Proposed similarity measures were designed based on fuzzy number and distance measure, and were proved. To calculate the degree of similarity of discrete data, relative degree between data and total distribution was obtained. Discrete data similarity measure was completed with combination of mentioned relative degrees. Power interconnected system with multi characteristics was considered to apply discrete similarity measure. Naturally, similarity measure was extended to multi-dimensional similarity measure case, and applied to bus clustering problem.

关键词： similarity measure multi-dimension discrete data relative degree power interconnected system

Fuzzy entropy design for non convex fuzzy set and application to mutual information

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Journal of Central South University 2011年第1期18卷 184-189页

作者： lee sang-hyuk lee sang-Min SOHN Gyo-Yong KIM Jaeh-Yung Department of Electronics Engineering Inha UniversityIncheon 402-751Korea School of Electrical Engineering and Computer Science Kyungpook National UniversityDaegu 702-701Korea School of Mechatronics Changwon National University

Fuzzy entropy was designed for non convex fuzzy membership function using well known Hamming distance *** proposed fuzzy entropy had the same structure as that of convex fuzzy membership *** procedure of fuzzy entropy was proposed by considering fuzzy membership through distance measure,and the obtained results contained more flexibility than the general fuzzy membership ***,characteristic analyses for non convex function were also *** on the mutual information were carried out through the proposed fuzzy entropy and similarity measure,which was also dual structure of fuzzy *** the illustrative example,mutual information was discussed.

关键词： fuzzy entropy non convex fuzzy membership function distance measure similarity measure mutual information

New reclosing scheme of distribution system for utilization of BESS using wavelet transform

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Journal of Central South University 2018年第1期25卷 78-83页

作者： PARK Keon-Woo KIM Chul-Hwan lee sang-hyuk RHEE sang-Bong College of Info.& Comm. Eng Sungkyunkwan UniversitySuwon16419Korea Department of Electrical and Electronic Engineering of Xi’an Jiaotong-Liverpool University (XJTLU) Suzhou 215123 China Department of Electrical Engineering Yeungnam University Gyeongsan 38541 Korea

This paper proposed the reclosing method in distribution system with battery energy storage system(BESS)using wavelet transform(WT).The proposed method performs the WT of load current and then calculates the absolute value of slope of detail *** mother wavelet used is db4of *** fault clearing is detected using the rapid increase of this *** the detection of fault clearing,the reclosing is *** verify the proposed method,various simulations according to the fault clearing times,fault resistances,and fault lengths are performed using *** simulation results show that fault clearing can be detected using proposed absolute value of slope of detail coefficient and hence the reclosing can be performed successfully.

关键词： distribution system electro-magnetic transient program reclosing battery energy storage system wavelet transform

Efficient and secure source authentication scheme for multicast user authentication

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Journal of Central South University 2013年第10期20卷 2741-2746页

作者： JEONG Yoon-su lee sang-hyuk SHIN Seung-soo Department of Information Communication Engineering Mokwon University Department of Electrical and Electronic Engineering Xi’an Jiaotong-Liverpool University Department of Information Security Tongmyong University

Multicast technology application has been widely utilized in broadband internet. Source authentication is one of the most needs for many multicast applications transferring real-time information such as stream video and online news. Because multicast current services provided to the group members are changed dynamically, data transferring by a group member is not used by the recipient. In order to verify the identity of the sender who sent the packet and to make sure that the data have not been tampered, an optimized source authentication scheme has been proposed to transfer the authentication information not to the next-door packet. The proposed method for multiple packets authenticates the source with a limited number of electronic signatures. The proposed method can reduce overhead compared to the method by adding a digital signature for every packet. In addition, by sending the generated electronic signature to the first packet and the last packet, it prevents the loss of consecutive packets, as well as a source authentication can be provided in real-time services.

关键词： multicast packet source authentication broadband Internet

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Journal of Central South University 2013年第8期20卷 2233-2238页

作者： PARK Jean-Ho HWANG Jai-hyuk PARK Wook-Je 魏荷 lee sang-hyuk Advanced Convergent Technology R&D Group Korea Institute of Industrial Technology School of Aerospace & Mechanical Engineering Korea Aerospace University Institute for Information and Electronics Research Inha University Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University

Study of fuzzy entropy and similarity measure on intuitionistic fuzzy sets (IFSs) was proposed and analyzed. Unlike fuzzy set, IFSs contain uncertainty named hesitance, which is contained in fuzzy membership function itself. Hence, designing fuzzy entropy is not easy because of many entropy definitions. By considering different fuzzy entropy definitions, fuzzy entropy on IFSs is designed and discussed. Similarity measure was also presented and its usefulness was verified to evaluate degree of similarity.

关键词： similarity measure multi-dimension discrete data relative degree power interconnected system

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Journal of Central South University 2011年第5期18卷 1602-1608页

作者： lee sang-hyuk PARK Wook-Je JUNG Dong-yean Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University Institute for Information and Electronics Research Inha University253 Yonghyun-dongNam-GuIncheon402-751Korea Daeho Technology Korea Co. LtdChangwonGyeongnam641-773Korea

The similarity computations for fuzzy membership function pairs were carried *** number related knowledge was introduced,and conventional similarity was compared with distance based similarity *** usefulness of the proposed similarity measure was *** results show that the proposed similarity measure could be applied to ordinary fuzzy membership functions,though it was not easy to *** conventional results on the calculation of similarity for fuzzy membership pair,fuzzy membership-crisp pair and crisp-crisp pair were carried *** proposed distance based similarity measure represented rational performance with the heuristic point of ***,troublesome in fuzzy number based similarity measure for abnormal universe of discourse case was ***,the similarity measure computation for various membership function pairs was discussed with other conventional results.

关键词： similarity measure fuzzy number distance similarity evaluation fuzzy membership function

Power interconnected system clustering with advanced fuzzy C-mean algorithm

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Journal of Central South University 2011年第1期18卷 190-195页

作者：王洪梅 KIM Jae-Hyung JUNG Dong-Yean lee sang-Min lee sang-hyuk School of Mechatronics Changwon National University Daeho Tech Co.Ltd. Changwon 641-465Korea Department of Electronics Engineering Inha University

An advanced fuzzy C-mean （FCM） algorithm was proposed for the efficient regional clustering of multi-nodes interconnected systems. Due to various locational prices and regional coherencies for each node and point, modified similarity measure was considered to gather nodes having similar characteristics. The similarity measure was needed to contain locafi0nal prices as well as regional coherency. In order to consider the two properties simultaneously, distance measure of fuzzy C-mean algorithm had to be modified. Regional clustering algorithm for interconnected power systems was designed based on the modified fuzzy C-mean algorithm. The proposed algorithm produces proper classification for the interconnected power system and the results are demonstrated in the example of IEEE 39-bus interconnected electricity system.

关键词： fuzzy C-mean similarity measure distance measure interconnected system clustering