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유한 요소법과 반응표면법을 이용한 상전도 흡인식 자기부상용 전자석의 최적 설계
유광현(Gwang-Hyeon Ryu),김광수(Kwang-Soo Kim),김미정(Mi-Jung Kim),김경범(Kyoung-Bum Kim),안한웅(Han-Woong Ahn),이형우(Hyung-Woo Lee),이주(Ju Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper present the design of improving performance of the electromagnetic for EMS. Electromagnetic performance on various design schemes such as teeth width, shoe height, shoe width has been investigated in detail by using FEM(Finite Element Method). Simulation-based RSM(Response Surface Methodology) is also applied in order to reduce the large number of analysis according to each design variable and consider the effect among variables. The design in all aspects in proposed by an optimization algorithm using regression equation derived from the simulation-based RSM.
슈퍼프리미엄(IE4)급 유도전동기 대체용 동기 릴럭턴스 전동기 고효율 설계연구
유광현(Gwang-Hyeon Ryu),이주(Ju Lee) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.11
In accordance with global energy conservation policies such as MEPS (Minimum Energy Performance Standard), electric motor industry is moving to super-high-efficiency machines and research to develop IE4 (International Energy Efficiency Class 4) motors has been launched. In this situation, SynRM (Synchronous Reluctance Motor) has been attracting attention in place of induction motor which hardly provides super premium efficiency. As a result, much research on SynRM is being performed at home and abroad. Also, some products have already been appearing in the market. Compared to induction motor, SynRM has better efficiency per unit area and wider operating range. Although the utilization of control system in synchronous motor results in higher prices, we still need to concentrate on developments of SynRM so as to comply with the new policies. This study demonstrated the electromagnetic design methods of super premium SynRM while maintaining the frame of existing IE3 induction motor. We documented the design procedures for generating high saliency which is the most essential and mechanical stress anlaysis is also treated. In conclusion, we proved the validity of our design by manufacturing and testing our 3 models.
고하중 불평형 회전체의 정속 주행 제어기 설계를 위한 유연체 제어 기반 시뮬레이션 플랫폼 구축
박광현(Gwang Hyeon Park),남경태(Kyung Tae Nam),이상무(Sang Mu Lee),안기탁(Gi Tak An),류성무(Sung Mu Ryu),구자춘(Ja Choon Koo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
It is important that constant velocity of gantry of 3D fluoroscopy for correct digital image processing. But constant velocity driving is difficult because gantry has heavy mass and eccentric loads. So a design of control algorithm and performance evaluation are needed for constant velocity of gantry of 3D fluoroscopy. But it is difficult that performance evaluation of control algorithm because of a special quality of 3D fluoroscopy. And flexible model analysis is necessary for resonance and displacement. So motor, reductor and unbalanced gantry of 3D fluoroscopy are designed with multibody dynamic analysis program, and simulation platform is designed for performance evaluation of robust control algorithm against disturbance. Dive performance such as velocity ripple in various condition was observed. So this paper proposes a design of flexible model simulation platform of imbalanced rotor with heavy mass for evaluation of control algorithm for constant velocity.
특집 : 레이저 기반 초정밀 초고속 가공시스템 - 신개념 레이저 기반 초정밀/초고속 레이저 복합/유연 가공 기술 개발
류광현,남기중,Ryu, Gwang-Hyeon,Nam, Gi-Jung 재료연구소 2010 機械와 材料 Vol.22 No.1
전자부품산업이 빠르게 발전하고 있기 때문에 고기능성 PCB의 수요 또한 많이 늘고 있다. 이러한 PCB는 전자제품의 굴곡성(flexibility) 있는 형태로 발전하여 전자제품의 소형화 및 고밀도화가 가능하고, 반복적인 굴곡에 높은 내구성을 갖는 연성(flexible) PCB(FPCB)의 사용이 증가하고 있으며, 이런 시장의 요구에 맞춰 연성 다층 구조의 FPCB에 대한 정밀 고속 가공 기술에 대한 수요도 급격히 확대되고 있다. 따라서 장비 운영의 효율성 극대화 및 설비 투자를 최소화하고 단일 장비로 절단(half cut, full cut), 제거, 트리밍, 리페어 고정 등을 수행할 수 있는 장비 개발을 위한 스캐너/스테이지 고정밀 제어, Z축 스텝가공, 멀티포인트 비전 인식을 통한 왜곡 최소화 등의 요소기술 개발관련 내용을 소개하고자 한다.
개심술시 혈청 $\beta_2$-microglobulin 의 변동에 관한 연구
류지윤,조광현,Ryu, Ji-Yun,Jo, Gwang-Hyeon 대한흉부심장혈관외과학회 1989 Journal of Chest Surgery (J Chest Surg) Vol.22 No.2
Nowadays, in spite of the remarkable development of the results of open heart surgery, the incidence of postoperative acute renal failure [ARF] has been increased due to the expansion of the candidates and prolonged operation time for complicated cases. It is also well known that ARF after open heart surgery, if once occurred, is a critical complication, therefore early diagnosis and treatment about it are very important for prognosis. Recently a low molecular weight [2 * microglobulin [[2* MG]has been used as a indicator of renal function. Because of the properties of [2 * MG, serum concentration of it is increased in glomerular dysfunction and urine excretion of it is increased in tubular dysfunction. Author studied about the perioperative changes of serum [2* MG and BUN concentration in 25 children and 30 adults for evaluation of significances of [2* MG as a parameter of postoperative renal function in open heart surgery, and the results were obtained as follows. l. In open heart surgery, the serum [2* MG concentration was elevated postoperatively in the all cases from the first postoperative day. 2. There were a significant correlation between the preoperative BUN and [2* MG concentration [P< 0.01]. The correlation factor[r] in child group was 0.8512, and in adults 0.8636. 3. The maximum level of serum [2* MG in the both child and adult groups were noticed in 4th postoperative day as 2.61*0.80mg/ 1 in child group and 3.39*1.47 mg/ 4 in adult group, and there was a significant difference between the two groups statistically[P < 0.05]. 4. The pattern of changes of serum concentration of [2* MG with time was very similar with the changes of BUN, but in a case of ARF [expired with it] the changes of [2* MG was more remarkable. 5. There was a significant differences in the maximum level of [2* MG between the 2 group according to the ECC time [groups of below and above 60 minutes] [P< 0.01].