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영구자석 배열에 따른 PMLSM의 진동 및 효율 특성에 관한 연구
李東燁(Dong-Yeup Lee),李承勳(Seung-Hoon Lee),張基鳳(Ki-Bong Jang),金奎卓(Gyu-Tak Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.2
This paper deals with a vibration and efficiency characteristics of Permanent Magnet Linear Synchronous Motor according to the PM arrangement. The generated force such as the thrust, detent force, normal force and lateral force are compared with analysis values and experimental ones. Furthermore characteristics of vibration and efficiency are estimated by experiments.
PMLSM의 SKew 와 Overhang 효과에 대한 3D 유한 요소 해석
李東燁(Dong-Yeup Lee),黃寅喆(In-Cheol Hwang),姜圭洪(Gyu-Hong Kang),金奎卓(Gyu-Tak Kim) 대한전기학회 2006 전기학회논문지 B Vol.55 No.10
This paper deals with skew and overhang effects of permanent magnet linear synchronous motor(PMLSM). The detent force and thrust characteristics considering skew and overhang effects of permanent magnet are analyzed by 3D finite element method and the results are compared to experimental values. As skew and overhang are applied to permanent magnet, the thrust is almost the same value but the detent force is reduced remarkably. By harmonic analysis, the distortion ratio of thrust is remarkably reduced from 4.29[%] to 2.3[%]. and. the ripple ratio of thrust is decreased from 8.2[%] to 3.56[%] at the same time. But, the lateral force which operate as the perpendicular direction of skew direction is generated. The lateral force and normal force acts by braking force between mover and LM-guide. Therefore. normal force and lateral force's reduction is required for more efficient drivinz of PMLSM.
이동엽 ( Dong Yeup Lee ),백종헌 ( Jong Heon Baek ),김동주 ( Dong Joo Kim ),김명신 ( Myoung Shin Kim ),이운하 ( Un Ha Lee ),박현수 ( Hyun Su Park ) 대한피부과학회 2014 대한피부과학회지 Vol.52 No.12
Leser-Trelat sign is a rare paraneoplastic dermatosis that is characterized by the eruptive and rapid development of multiple seborrheic keratosis that coincides with an internal malignancy. Eruptive seborrheic keratosis can be pruritic and appear in a “Christmas-tree pattern.” This sign occurs in association with a number of cancers, such as adenocarcinoma of the gastrointestinal tract and various lymphoproliferative disorders. However, Leser-Trelat sign associated with a malignant melanoma is very rare. A 58-year-old male patient presented with an asymptomatic black mass on the penile orifice and patch on the glans penis. He complained of gross hematuria. At the same time, he developed asymptomatic multiple brown papules and plaques on the back. The histopathologic findings of the glans and back lesions were consistent with malignant melanoma and seborrheic keratosis, respectively. Here, we describe a rare case of Leser-Trelat sign associated with malignant melanoma. (Korean J Dermatol 2014;52(11):895∼ 899)
정신건강의학과 입원 중 피부과로 의뢰된 환자에 대한 분석
이동엽 ( Dong Yeup Lee ),김명신 ( Myoung Shin Kim ),이운하 ( Un Ha Lee ),함정희 ( Jeong Hee Hahm ) 대한피부과학회 2015 大韓皮膚科學會誌 Vol.53 No.8
Background: The need for dermatological consultations for hospitalized patients has gradually increased and there are a number of dermatoses caused by underlying psychological conditions. However, the data regarding the analyses of these consultations for psychiatric inpatients are limited. Objective: To analyze the demographics and the type of dermatoses among inpatients with primary psychiatric diseases. Methods: We retrospectively reviewed 581 consultation reports for inpatients referred by the Department of Psychiatry between January 1, 2009 and December 31, 2014. Results: The proportion of the consulted patients from the Department of Psychiatry was 25.9% (331 consulted inpatients/1279 psychiatric inpatients). The most common age group was the 40∼49 year-old group (19.3%) and the male to female ratio was 1:1.14. There were no remarkable findings regarding the annual or seasonal distribution. According to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV), the most common underlying psychiatric disorders were mood disorders (41.0%), followed by schizophrenia and other psychotic disorders (25.0%), and substance-related disorders (12.1%). The most frequent skin disorders were eczematous dermatoses (34.6%) and infectious dermatoses (32.2%); dermatomycosis (20.8%) was especially common.The most common reasons for consultation were new-onset dermatologic problems (68.5%), followed by persistence or aggravation of pre-existing dermatologic disorders (28.7%). Conclusion: This study reports the dermatologic characteristics of psychiatric inpatients. We conclude that dermatologists and psychiatrists need to be concerned about the education and continuous management of various skin diseases in psychiatric patients. (Korean J Dermatol 2015;53(8):585∼593)
부하형태에 따른 LSM의 부하 모델링 및 기동특성 해석
이동엽(Dong-Yeup Lee),한광규(Kwang-Kyu Han),김규탁(Gyu-Tak Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
This paper presents dynamic characteristic of Permanment Magnet Linear Synchronous Motor(PMLSM). In order to analyze dynamic characteristics, simulink of Matlab is used. The measuring system of dynamic characteristics is manufactured and experiment results are compared with simulation results.
Moving Magnet Type PMSLM의 영구자석 형상 최적화
이동엽(Dong-Yeup Lee),김규탁(Gyu-Tak Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
In this paper, the notch of teeth and skew of permanent magnet are used to reduce the detent force caused by slot-teeth structure. Also, the shape of permanent magnet is optimized to reduce the detent forceowing to flux harmonics components of permanent magnet. As a result, thrust is decrease about 2[%]. But, the distortion ratio of thrust is decreased from 1.04[%] to 0.75[%]. And, the ripple ratio of thrust is decreased from 2.6[%] to 1.65[%].
이동엽 ( Dong Yeup Lee ),홍광철 ( Kwang Cheol Hong ),백종헌 ( Jong Heon Baek ),김동주 ( Dong Joo Kim ),김명신 ( Myoung Shin Kim ),이운하 ( Un Ha Lee ),박현수 ( Hyun Su Park ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.10
Crohn`s disease is a systemic inflammatory and granulomatous disease, mainly involving the gastrointestinal tract with extraintestinal manifestations such as the skin, liver and bone. Cutaneous manifestations of Crohn`s disease are relatively common; however, the groin is an unusual site for cutaneous Crohn`s disease. A 36-year-old male presented with mild pruritic nodules on the left groin for 2 months. Nine years ago, he was diagnosed with intestinal Crohn`s disease by endoscopic biopsy. Histopathologic examination of the cutaneous lesion showed non caseating granulomatous reactions composed of multinucleated giant cells with lymphohistiocytic infiltration in the dermis. Staining for periodic acid-Schiff and acid-fast bacilli was negative. From these findings, we diagnosed these lesions as cutaneous Crohn`s disease. The lesions were markedly improved with three rounds of intralesional steroid injection. (Korean J Dermatol 2013;51(10):825∼828)