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        • KCI등재SCOPUS

          Fault Classification Method for Inverter Based on Hybrid Support Vector Machines and Wavelet Analysis

          Zhi-kun,Hu,Wei-hua,Gui,Chun-hua,Yang,Peng-cheng,Deng,Steven,X.,Ding 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4

          A new classification method for fault waveform is proposed based on discrete orthogonal wavelet transform (DOWT) and hybrid support vector machine (hybrid SVM) for fault type of a three-phase voltage inverter. The waveforms of output voltage obtained from the faulty inverter are decomposed by DOWT into wavelet coefficient matrices, through which we can obtain singular value vectors acted as features of time-series periodic waveforms. And then a multi-classes classification method based on a new Huffman Tree structure is presented to realize 1-v-r SVM strategy. The extracted features are applied to hybrid SVM for determining fault type. Compared to employing the structure based on ordinary binary tree, the superiority of the proposed SVM method is shown in the success of fault diagnosis because the average Loo-correctness of the SVM based on Huffman tree structure exceed the general SVM 3.65%, and the correctness reaches 99.6%.

        • KCI등재

          Identification and characterization of BGL11(t), a novel gene regulating leaf-color mutation in rice (Oryza sativa L.)

          Zhi-kun,Wang,Yun-xiang,Huang,Zheng-diao,Miao,Zhi-yan,Hu,Xin-zhang,Song,Li,Liu 한국유전학회 2013 Genes & Genomics Vol.35 No.4

          A novel bright-green leaf mutant, bgl11, derived from Nipponbare (Oryza sativa L. ssp. japonica) treated by ethyl methanesulfonate (EMS), exhibited a distinct brightgreen leaf phenotype throughout development. Chlorophyll contents of bgl11 decreased significantly than that of its wild-type parent. Genetic analysis suggested that the brightgreen leaf trait was controlled by a single recessive nuclear gene, which was tentatively designed as BGL11(t). To isolate the BGL11(t) gene, a map-based cloning strategy was employed, and the gene was finally mapped in a 94.7 kb region between marker InDel11-5 and InDel11-9 on the long arm of chromosome 11, in which no gene leaded to leaf-color mutation had been mapped or cloned. Cloning and sequencing analysis revealed that, LOC_Os11g38040, which was predicted to encode an expressed protein, had a 9 bp segment deletion in the coding region of bgl11. Furthermore, the transgenic plants with wild-type gene LOC_Os11g38040were restored to normal phenotype. Accordingly, the gene (LOC_Os11g38040) was identified as the BGL11(t) gene. These results are very valuable for further study on BGL11(t)gene and illuminating the mechanism of chloroplast development in rice.

        • KCI등재SCOPUS

          Sequences Feature Vectors Extracting Method for Similarity Measurement Based on Wavelet and Matrix Transforming

          Zhi-kun,Hu,Wei-hua,Gui,Chun-hua,Yang,Fei,Xu 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2

          A feature vectors extracting method for similarity measurement between a referenced sequence and an analyzed sequence is proposed. The referenced sequence and analyzed sequence are compressed into two wavelet matrices by Discrete Orthogonal Wavelet Transform (DOWT), respectively. A singular value vector and the multi-subspaces of the referenced matrix are derived from wavelet matrices by singular value decomposition (SVD). Consequently, a uniform subspace of which all sequences are mutual orthogonal can be constructed by serializing multi-subspaces, and the analyzed feature vectors can also be obtained by inner product transformation between analyzed sequence and all sequences derived from the multi-subspaces. The similarity is measured between the analyzed feature vector and the singular value vector of the referenced sequence. The simulation results show that the proposed method is improved in the dimension, accuracy and anti-noise ability with little sensitivity sacrifice.

        • KCI등재SCOPUS

          Random vibration analysis of train-slab track-bridge coupling system under earthquakes

          Zhi-ping,Zeng,Xian-feng,He,Yan-gang,Zhao,Zhi-wu,Yu,Ling-kun,Chen,Wen-tao,Xu,Ping,Lou 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.5

          This study aimed to investigate the random vibration characteristic of train-slab track-bridge interaction system subjected to both track irregularities and earthquakes by use of pseudo-excitation method (PEM). Each vehicle subsystem was modeled by multibody dynamics. A three-dimensional rail-slabgirder-pier finite element model was created to simulate slab track and bridge subsystem. The equations of motion for the entire system were established based on the constraint condition of no jump between wheel and rail. The random load vectors of equations of motion were formulated by transforming track irregularities and seismic accelerations into a series of deterministic pseudo-excitations according to their respective power spectral density (PSD) functions by means of PEM. The time-dependent PSDs of random vibration responses of the system were obtained by step-by-step integration method, and the corresponding extreme values were estimated based on the first-passage failure criterion. As a case study, an ICE3 high-speed train passing a fifteen-span simply supported girder bridge simultaneously excited by track irregularities and earthquakes is presented. The evaluated extreme values and the PSD characteristic of the random vibration responses of bridge and train are analyzed, and the influences of train speed and track irregularities (without earthquakes) on the random vibration characteristic of bridge and train are discussed.

        • KCI등재

          Colorimetric Probe Coupled to Dispersive Liquid–Liquid Microextraction for Determination of Dopamine in Serum

          Zhi-gang,Tai,Yi-ren,Zhu,Yi-bo,Yuan,Jin,Liu,Zhen-jie,Li,Zhi-hua,Liu,Kun-miao,Wang 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.3

          In this work, a highly sensitive method using a colorimetric probe coupled to dispersive liquid?liquid microextraction (DLLME) was developed for the quantitative determination of dopamine (DA) in serum. The DA in serum was concentrated by DLLME to increase the detection sensitivity and reduce the matrix effects. After the DLLME process, a colorimetric probe of silver triangular nanoparticles (AgTNPs) was used to detect DA, which was based on the plasma transformation of AgTNPs caused by strong interactions with melamine (MA). The results showed that DA could inhibit the aggregation of AgTNPs induced by MA, resulting in the recovery of the surface plasmon resonance (SPR) peak of AgTNPs. Thus, the DLLME method followed by colorimetric probe detection of DA can be achieved. The parameters affecting the proposed method were optimized, under the optimal conditions, a linear calibration curve was obtained over a concentration range of 5 to 250?nM with a recovery from 94.4 to 101.3%. The detection limit was 1.6 nM (at an S/N ratio of 3). The present method was successfully applied to determine DA in human serum.

        • KCI등재SCOPUS

          An Efficient Multi-PCA Based On-line Monitoring Scheme for Multi-Stages Imperial Smelting Process

          Zhi-kun,Hu,Zhi-wen,Chen,Wei-Hua,Gui,Chun-hua,Yang,Lin-zi,Yin,Xiao-qi,Peng 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.2

          Imperial Smelting Process (ISP) is one of the main methods for Zinc and Lead smelting. In this paper, we firstly focus on its unique characteristics that ISP consists of many feeding cycles repeated in a similar way, and the normal process changes and multiple operating conditions would be frequently found in the process which would always lead to false alarms. To this end, we classify each feeding cycles of ISP into initial stage, transition stage, and steady stage, and use standard PCA, first order perturbation (FOP) based recursive dynamic PCA and multi-mode approach to deal with them respectively. The monitoring results using real data show that the proposed scheme can be able to eliminate false alarms and detect faults efficiently.

        • KCI등재SCOPUS

          Analysis and Correction of Through-bolt End-region Overheating and Breakdown Failure in a Large Tubular Hydro-generator

          Zhi-ting,Zhou,Zhen-nan,Fan,Jian-fu,Li,Kun,Wen,Bide,Zhang,Tao,Wang,Yan-kun,Xia,Zhang,Sun,Bing,Yao 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.6

          A field-circuit coupling model of a typical faulty generator is established to correct through-bolt end-region overheating and breakdown failure in a tubular hydro-generator. Using the model, eddy current loss and electromagnetic forces on through bolts under normal and failure conditions are analyzed and compared and the natural frequency of a through bolt is determined. Based on the analysis results, the causative mechanism of failure is revealed and targeted improvement design measures are proposed. The numerical results are found to be consistent with the actual fault characteristics, validating the design measure improvements. The results are useful in improving the design and manufacturing standards and enhancing the operational reliability of large tubular hydrogenerators.

        • SCIESCOPUSKCI등재

          Analysis and Correction of Through-bolt End-region Overheating and Breakdown Failure in a Large Tubular Hydro-generator

          Zhou,,Zhi-ting,Fan,,Zhen-nan,Li,,Jian-fu,Wen,,Kun,Zhang,,Bide,Wang,,Tao,Xia,,Yan-kun,Sun,,Zhang,Yao,,Bing The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.6

          A field-circuit coupling model of a typical faulty generator is established to correct through-bolt end-region overheating and breakdown failure in a tubular hydro-generator. Using the model, eddy current loss and electromagnetic forces on through bolts under normal and failure conditions are analyzed and compared and the natural frequency of a through bolt is determined. Based on the analysis results, the causative mechanism of failure is revealed and targeted improvement design measures are proposed. The numerical results are found to be consistent with the actual fault characteristics, validating the design measure improvements. The results are useful in improving the design and manufacturing standards and enhancing the operational reliability of large tubular hydro-generators.

        • KCI등재SCOPUS

          3D Electromagnetic-Temperature Field Close-Coupling Calculation of Losses and Heat in the Damper Winding of a Large Tubular Hydro-Generator

          Kun,Wen,Li,Han,Zhi-ting,Zhou,Zhen-nan,Fan,Yong,Liao,Jun,Wang,Zhang,Sun,Bing,Yao,Bide,Zhang 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.3

          To obtain more precise and rational calculation details of the loss and heat of a damper winding in a tubular hydro-generator, this study develops a three-dimensional, fi nite-element, electromagnetic-temperature fi eld close-coupling model of the damper winding. On the basis of multi-physical fi eld coupled theory, the model fully considers the temperature eff ects of the damper winding resistivities and heat conductivities, and the eddy current loss in the end region of the damper winding. The model was verifi ed by direct tests of the damper winding temperature. Unlike the conventional weak-coupling model, the proposed close-coupling model fully captures the interaction between the electromagnetic and temperature fi elds. Therefore, of the model more accurately and reasonably calculates the loss and heat of the damper winding than the conventional model. The proposed calculation model can properly assess the loss and heat of damper windings in large hydro-generators, which is helpful for improving the design standards of hydro-generators.

        • KCI등재

          Design of a Sliding Mode Control-Based Trajectory Tracking Controller for Marine Vehicles

          Zhi-Zun,Xu,Heon-Hui,Kim,Gyei-Kark,Park,Taek-Kun,Nam 한국항해항만학회 2018 한국항해항만학회지 Vol.42 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          A trajectory control system plays an important role in controlling motions of marine vehicle when a series of way points or a path is given. In this paper, a sliding mode control (SMC)-based trajectory tracking controller for marine vehicles is presented. A small-sized unmanned ship is considered as a control object. Both speed and heading angle of a ship should be controlled for tracking control. The common point of related researches was to separate ship s speed and heading angle in control methods. In this research, a new control law from a general sliding mode theory that can be applied to MIMO (multi input multi output) system is derived and both speed and heading angle of a ship can be controlled simultaneously. The propulsion force and rudder force are also applied in modeling stage to achieve accurate simulation. Disturbance induced by wind is also tackled in the dynamics considering robustness of the proposed control scheme. In the simulation, we employed a way-point method to generate ship s trajectory and applied the proposed control scheme to ship s trajectory tracking control. Our results confirmed that the tracking error was converged to zero, thus demonstrating the effectiveness of the proposed method.

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