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유체기구를 이용한 유압계통의 충격치제어에 수탄되는 반응지연에 관한 연구
이주성,이계복,Lee, Joo-Seong,Lee, Kye-Bock 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11
The response time represents how fast a system responds to a given disturbance at the system boundary. Flow restricting devices for controlling transients can result in a decrease in the peakm pressure, but may change response time. Response lag in a hydraulic system leads to inefficient working cycle and operator discomfort. The experiments were conducted in order to get information on the parameters which exert appreciable influence on the response time. The experimental apparatu including a hydraulic actuator, orifice and a hydraulic pump was an idealization of a bucket hydraulic shifting system. Experimental results show that the response time depends on operating pressure and flow rate. The effects of orifice type and size on the response time are quantified.
알칼리 축전지의 활물질에 관한 연구. 카드뮴 전극에 관하여
이주성,주충렬,박수길,Ju Seong Lee,Choong Yeoul Joo,Park, Su Gil 대한화학회 1981 대한화학회지 Vol.25 No.5
Ni-Cd 전지 중 카드뮴 전극을 수산화 칼륨용액 중에서 각종 조건의 변화에 따른 cyclic voltammetry를 행하여 카드뮴전극의 전기화학적 거동을 검토하였으며 voltammogram에 나타나는 peak전위 근처의 각 전위에서 정전위 전해를 하여 충, 방전상태의 전기화학적 거동을 X-선 회절선도의 해석 결과와 결부시켜 전극반응 메카니즘을 종합적으로 검토하였다. 수산화카드뮴 마이너스 전극의 음극분극 곡선에는 두 개의 peak가 나타난다. 마이너스극의 수산화카드뮴은 제 1 peak 전위에서 카드뮴 금속으로 환원되고 제 2 peak 전위에 도달하면 매우 활성이 큰 금속 상태로 되며 (002)면이 (101)면보다 성장이 매우 크다. 또한 제 2 peak 전위의 카드뮴은 산소와의 선택적인 반응이 급속히 일어남을 알 수 있었다. 본 실험의 결과 카드뮴극과 산소와의 반응은 화학적 반응인 $2Cd + O_2 + 2H_2O\;{\longrightarrow}\;2Cd(OH)_2$으로 진행된다고 추정하였다. The electrochemical behavior of cadmium electrode for the nickel-cadmium battery system has been studied by cyclic voltammetry, controlled potential electrolysis and X-ray diffraction method. Cathodic polarization curve for cadmium hydroxide electrode prepared by electrochemical pretreatment of metallic cadmium showed two peaks. It has been found that cadmium hydroxide was reduced to cadmium metal at the first peak potential, whereas very activated metal of cadmium which was strongly oriented (002) rather than (101) was formed at the second peak potential. It was also found that the cadmium formed at the second peak potential reacted rapidly with oxygen. Therefore, it could be presumed that the cadmium recombination reaction with the oxygen was chemical, and could be represented as $2Cd + O_2 + 2H_2O\;{\longrightarrow}\;2Cd(OH)_2$.
꿀벌 병원성 바이러스 Deformed Wing Virus의 4종 특이 단백질들의 대량 생산
이주성(Joo-seong Lee),루옹티홍장(Giang Thi Huong Luong),윤병수(Byoung-Su Yoon) 한국양봉학회 2015 韓國養蜂學會誌 Vol.30 No.4
Deformed Wing Virus (DWV) is one of viral pathogens in honeybee and caused a wing deformity and a premature death of honeybee. In this study, capsid protein VP1, capsid protein VP1-VP3 complex, RNA dependent RNA Polymerase (RdRP) and C3G peptidase (C3G) originated from DWV were successfully over-expressed using E. coli expression system, respectively. Each recombinant proteins using pET32a(+) or pMAL-C2 system was purified using affinity-column chromatography under optimum expression conditions, Four specific proteins in this study would be use as antigens to generate specific antibodies against DWV. Especially, recombinant RdRP and recombinant C3G might be useful materials to studies on enzymatic analysis and inhibitory assay of DWV.
유압제어계통의 액추에이터 응답시간 특성변화에 관한 실험적 연구
이주성(Joo-Seong Lee),이계복(Kye-Bock Lee) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.1
Response time of actuator in a hydraulic system may be important and necessary to avoid failures and to improve the efficiency of operation. Flow restricting devices can result in a decrease in the peak pressure, but may change the response time. The response time has an important effect on both operator and operator perceived smoothness. The response time should correspond to how fast a system responds to a given disturbance at the system boundary, Occasionally the appropriate response time is not easily determined. This study is on the characteristics of response time in the hydraulic system.<br/>
유압 브레이크계통의 과도맥동압력 제어특성에 관한 실험적 연구
이주성(Joo-Seong Lee),이계복(Kye-Bock Lee),이충구(Chung-Gu Lee) 한국산업융합학회 2001 한국산업융합학회 논문집 Vol.4 No.1
A method for the control of pulsating pressure transients in the hydraulic brake system has been presented and experimentally verified. This control is accomplished by installing flow restricting devices at appropriate locations in the brake oil pipe line. The experimental results presented are expected to provide a basis for transient control design of hydraulic brake systems.<br/> <br/> <br/>