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이동윤,구승엽,김석현,최영민,문신용,김정구,Lee, Dong-Yun,Gu, Seung-Yeop,Kim, Seok-Hyeon,Choe, Yeong-Min,Mun, Sin-Yong,Kim, Jeong-Gu 한국건강관리협회 2004 한국건강관리협회지 Vol.2 No.2
Objective : To identify the risk factors for postmenopausal osteoporosis in Korea Materials and methods : Bone mineral density (BMD) at the lumbar spine and femoral neck was measured by dual energy X-ray absorptiometry in 808 apparently normal postmenopausal Korean women. Questions about life style, demographic parameters, medical history and social habits etc. were asked on these women; 2ll women with normal bone mineral density, and 597 women with osteopenia or osteoporosis. Results 'Age of >50 years, low body mass index (BMI; <18.5 kg/m2), long duration of menopause(>10 years), and previous history of fracture were associated with increased prevalence of osteopenia or osteoporosis. Women without the outside activity also showed a higher frequency of low bone mass, Risk for osteopenia or osteoporosis was low in women with high BMI (>23 kg/m2) and women with job. The prevalence of low bone mass appeared to be independent of the following parameters: socioeconomic status, familial history, smoking, drinking, exercise, previous use of oral contraceptive, coffee or milk consumption, and degree of sunlight exposure. Conclusion 'Age, BMI, duration of menopause, previous history of fracture and degree of outside activity are the risk factors for postmenopausal osteoporosis in Korea.
단위 역률을 갖는 3상 BUCK 다이오드 정류기에서의 새로운 DC 리플-전압 저감 기법
이동윤,최익,송중호,최주엽,김광배,현동석,Lee, Dong-Yun,Choy, Ick,Song, Joong-Ho,Choi, Ju-Yeop,Kim, Kwang-Bae,Hyun, Dong-Seok 전력전자학회 2000 전력전자학회 논문지 Vol.5 No.2
본 논문에서는 3상 강압형 다이오드 정류기에서 출력전압의 저주파 리플 전압을 감소시키기 위한 새로운 제어기법을 제안한다. 제안한 펄스 주파수 변조 기법은 강압형 다이오드 정류기의 출력전압과 넓은 부하 범위에 대한 주 스위치의 영전류 스위칭을 보장하기 위해 적용된다. 본 논문에서 적용된 펄스 주파수 변조 기법은 일반적으로 입력전류의 낮은 고조파의 단위 역률의 장점을 지니고 있다. 또한 출력전압에서 보여진 저주파 리플전압을 감소시키기 위해 효과적으로 사용되어진다. 제안된 제어기법을 자세하게 설명하며 그 타당성을 검증하기 위해 시뮬레인션 및 실험을 통하여 검증한다. A technique to suppress the low frequency ripple voltage of the DC output ${\gamma}$oltage in three-phase buck d diode rectifiers is presented in this paper. The proposed pulse frequency modulation method is employed to r regulate the output voltage of the buck diode rectifiers and guarantee zero-current switching of the switch over the Vvide load range. The pulse frequency control method used in tIns paper shows generally good p performance such as low THD of the input line current and unity power factor. In addition, the pulse f freιluency method can be effectively used to suppress the low frequency voltage ripple appeared in the dc output voltage. The proposed technique illustrates its validity and effectiveness through the respective s simulations and experiments.
이동윤(Dong Yun Lee),김승영(Seong Young Kim),황순철(Soon Chul Hwang),이준상(Jun Sang Lee),강종식(Jong Sik Kang) 대한내과학회 1988 대한내과학회지 Vol.34 No.5
N/A Recently the prevalence of malaria has been increasing around the world and there is an increasing concern about exogenous malaria in none-endemic areas. We report 21 cases of imported malaria seen at the Baptist Hospital from August 1982 to December 1987 with a review of the literatures. The following is a summary of the findings. 1) All cases were physically active men with a mean age of 35.7 years. 2) The majority (71%) of patients had malaria imported from Africa. 3) Plasmodium falciparum infection was more prevalent (76%) than any other species. 4) 76% of the patients were afflicted with malaria before their return to Korea. 5) 23.8% of the patients had serious complications such as cerebral malaria, blackwater fever, and acute renal insufficiency. 6) 9 cases were chloroquine-sensitive and 11 cases were chloroquine-resistant. We should be cognizant of the risks, the necessity for chemoprophylaxis of travelers, and the difficulties in the diagnosis and treatment of malaria.