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Yujin Song,Jeong Jun Kim,Hong Zhu,Jang Sun Suh 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
Two-spotted spider mite, Tetranychus urticae (Koch) is one of the serious pests in economically important crops such as strawberry and cucumber and so on. Acaricides have been used as the main control agents. This study was conducted to test the synergistic effects of the Beauveria bassiana GHA, which has been registered for whitefly and thrips, and five pesticides (abamectin, acrinathrin, bifenthrin imidacloprid, dinotefuran, and indoxacarb, which are commonly used pesticides in strawberry in Korea), on the two-spotted spider mite T. urticae. Five tested pesticides did not inhibit spore germination and mycelial growth of B. bassiana. Pesticides were applied to potted strawberry plants at four different treatments (recommended concentration, 1/5 recommended concentration, 1/5 recommended concentration + GHA(108 conidia/ml), and only GHA(108 conidia/ml). Mortality in larvae of two-spotted spider mite was 12% in GHA 5 day after treatment. Mortality in abamectin treated T. urticae was 98.5% and 100% at 1/5 recommended concentration and recommended concentration, respectively, 3 days after treatment. Acrinathrin, indoxacarbe, dinotefuran and difenthrin imidacloprid caused 60%, 14%, 16% and 91% mortality at recommended concentration 5 day after treatment. The tested five pesticides and B. bassiana GHA had no synergistic effect.
Design of a fault-tolerant system for a multi-motor drive with multiple inverter leg faults
Song, Yujin,Zhao, Jin,Sun, Jiajiang The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.11
A novel fault-tolerant system for a multi-motor drive with one-leg, two-leg, and secondary faults is designed in this study. Fault tolerance is realized from pre-fault to post-fault via a topology reconstruction scheme and an integrated control law. The scheme develops a reconstructible topology and its reconstruction algorithm. The multi-motor drive can be reconstructed into appropriate tolerant topologies on the basis of the diagnosis results. The control law based on the predictive torque control method is universal under any topology by designing a unified voltage vector model and an optimal switching state decision. The proposed system can cope with more types of faults and effectively switch from a healthy state to a fault-tolerant state under any fault. The effectiveness and performance of the fault-tolerant system are verified and demonstrated by simulation and experiment results.
Song, Yujin,Kim, Dongil,Lee, Ha-Jin,Lee, Hyosun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
The reaction between $[CdBr_2{\cdot}4H_2O]$ and anhydrous $[ZnCl_2]$ with N,N'-bidentate N-(pyridin-2-ylmethylene)-cyclopentanamine (impy) in ethanol yields dimeric $[(impy)Cd({\mu}-Br)Br]_2$ and monomeric $[(impy)ZnCl_2]$ complexes, respectively. The X-ray crystal structure of Cd(II) and Zn(II) complexes revealed that the cadmium atom in $[(impy)Cd({\mu}-Br)Br]_2$ and zinc in $[(impy)ZnCl_2]$ formed a distorted trigonal-bipyramidal and tetrahedral geometry, respectively. Both complexes showed moderate catalytic activity for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO), with polymethylmethacrylate (PMMA) syndiotacticity of about 0.70.
A Power Control Scheme of a Fuel Cell Hybrid Power Source
Yujin Song(송유진),S. B. Han(한수빈),S. I. Park(박석인),H. G. Jeong(정학근),B. M. Jung(정봉만),G. D. Kim(김규덕),S. W. Yu(유승원) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
This paper describes a power control scheme to improve the performance of a fuel cell-battery hybrid power source for residential application. The proposed power control scheme includes a power control strategy to control the power flow of the fuel cell hybrid power system and a digital control technique for a front-end dc-dc converter of the fuel cell. The power control strategy enables the fuel cell to operate within the high efficiency region defined by the polarization curve and efficiency curve of the fuel cell. A dual boost converter with digital control is applied as a front-end ed-ed converter to control the fuel cell output power. The digital control technique of the converter employs a moving-average digital filter into its voltage feedback loop to cancel the low frequency harmonic current drawn from the fuel cell and then limits the fuel cell output current to a current limit using a predictive current limiter to keep the fuel cell operation within the high efficiency region as well as to minimize the fuel cell oxygen starvation.
가정용 연료전지를 위한 전류형 고주파 링크 DC-AC 컨버터
송유진(Yujin Song),정세교(Se-Kyo Chung) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 가정용 연료전지 전원시스템에 적합한 전류형 고주파 링크 DC-AC 컨버터를 제안한다. 제안된 전류형 고주파 링크 DC-AC 컨버터는 전류형 풀-브릿지 인버터, 능동 고조파 필터, 고주파 링크 변압기, 사이클로 컨버터로 구성된다. 1차 측의 전류형 고주파 풀-브릿지 인버터는 정현파 PWM에 의해 변조된 전류펄스를 영전류 스위칭과 함께 발생시키고 두개의 양방향 스위치와 출력 필터 캐패시터만으로 구성된 사이클로 컨버터는 분리형 단상 60㎐ 정현파 전압을 출력한다. 입력단에 연결된 능동 고조파 필터는 연료전지로부터 유기된 저고조파 전류를 배터리 또는 수퍼캐패시터같은 장시간의 에너지 저장장치 없이 제거한다.