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Barrier 배치를 이용한 슈퍼프리미엄급 SynRM의 토크리플 저감 설계
유회총(Huai-cong Liu),이호준(Ho-Jun Lee),오세영(Se-Young Oh),유광현(Gwang-Hyeon Ryu),홍현석(Hyun-Seok Hong),김승주(Seung-Joo Kim),이주(Ju Lee) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.4
SynRM (Synchronous Reluctance Motor) is a high efficient motor. With a simple structure and more cheaper than induction Motor, However, the torque ripple of Synchrous Reluctance Motor is very large. This paper analyzes the SynRM output characteristics with a new rotor flux barriers arrangment design, since the stator of SynRM is similar as that of an induction motor. And compares a basic Model. By designed the relative positions between outer edges of flux barriers and slots correspond. As a result torque ripple can be reduced.
초고속 자기부상열차용 LSM의 성능향상을 위한 설계 및 특성 해석
홍현석(Hyun-Seok Hong),이호준(Ho-Jun Lee),오세영(Se-Young Oh),유광현(Gwang-Hyeon Ryu),유회총(Huai-Cong Liu),함상환(Sang-Hwan Ham),김솔(Sol Kim),이주(Ju Lee) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.4
In this paper, improved model of the LSM (Linear Synchronous Motor) for high-speed magnetic levitation train was designed to improve the performance and save material costs. Characteristics of the basic model was analyzed by the finite element method, and based on this information the design parameters of the improved model was chosen. The mover yoke width, stator yoke width, slot opening are the design parameters and was analyzed by the finite element method. Further discussion is made in the direction of the design in order to improve the performance and suppliment the fault between the basic and improved model, by comparing the characteristics.
내과적 치료에 반응하지 않은 Lemierre 증후군 1예
허태윤 ( Tae Yun Heo ),정복현 ( Bock Hyun Jung ),유내선 ( Nae Sun Ryou ),정형주 ( Hyoung Chu Joung ),조민형 ( Min Hyung Cho ),김미혜 ( Mi Hye Kim ),류대식 ( Dae Sik Ryu ) 대한내과학회 2008 대한내과학회지 Vol.74 No.2
Lemierre syndrome is a rare clinical condition that is characterized by anaerobic oropharyngeal infections leading to septic thrombophlebitis of the internal jugular vein and frequent secondary metastatic infections. The accurate diagnosis and treatment, for early stage disease, is important because it may be associated with a high mortality rate if untreated. We present the case of a 34-year-old man who presented with a history of typical for the diagnosis of Lemierre syndrome. Supportive care with antibiotics did not improve the clinical condition. The clinical course improved after treatment with IV anticoagulant and surgical thrombectomy. In addition, he had the antiphospholipid syndrome, which is known to be a common cause of acquired arterial or venous thrombosis. Therefore, in this patient the associated antiphospholipid syndrome might precipitate an internal jugular venous thrombophlebitis after an oropharyngeal infection or might account for the poor response to medical treatment. (Korean J Med 74:203-207, 2008)
Micro Hexapod Robot Using Dual-axis Electromagnetic Actuator
Quang Hoan Le(레광환),WangHun Lee(이왕훈),YoungShik Kim(김영식),Bong-Jo Ryu(유봉조),Hyun-ho Shim(심현호),Buhyun Shin(신부현) 한국소음진동공학회 2021 한국소음진동공학회 논문집 Vol.31 No.6
Microrobots utilized in industrial applications or medical tasks have been researched by applying various types of actuators. However, compared with live organisms, the majority of compact actuators are not able to sufficiently supply the power demanded for robotic implementations. This paper presents a novel design for a hexapod microrobot that uses electromagnetic oscillatory actuators. Each two-degree-of-freedom (2-DOF) leg moves by utilizing compact dual-axis electromagnetic actuators. First, the structure and kinematics of the hexapod microrobot are presented and theoretically analyzed. In our study, a tripod gait is utilized to enable the robot to walk on the desired terrain. All virtual models and physical prototypes are detailed to test the motion plan of the proposed system. Finally, simulation and experimental results are used to evaluate the performance and verify the ability of the novel design of our hexapod microrobot.
만성 알코올중독 환자에서 뇌량의 형태학적 변화 - 자기공명영상을 이용한 연구 -
이태주(Tae-Joo Lee),최진희(Jin-Hee Choi),정문용(Moon-Yong Chung),노정균(Jung-Kyun Rho),유 현(Hyun Ryu) 한국중독정신의학회 2000 중독정신의학 Vol.4 No.2
Objectives:The purpose of this study determines difference on corpus callosum between chronic alcoholic patients and controls, and relationship between severity of ethanol intake and the degree of this atrophy. Methods:Clinicoradiologic study was carried out in 20 chronic alcoholics and age-matched controls. All subjects were male and right-handedness. To estimate alcohol habits for subjects, structured interview have been made. Measurement of the midsagittal corpus callosum area and thickness (genu, truncus and splenium), as well as the frontal lobe index (FLI) and the width of the cortical sulci (SWS) on T 1 -and T 2 -weighted Magnetic Resonance Images were performed. Results:Compared to controls, alcoholics had significantly decreased corpus callosum area and thickness (mainly in genu), and significantly increased FLI and SWS. The callosal area negatively correlated with the cortical atrophies and the area of genu of the corpus callosum negatively correlated with the frontal atrophies. Moreover, the reduction of corpus callosum correlated with the total lifetime dose of ethanol consumed. Conclusions:In chronic alcoholics, atrophy of the corpus callosum is common finding and may reflect the severity and pattern of cortical damage. And the degree of callossal atrophy correlated with the severity of ethanol intake as well.