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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.
군인들에서 성인 주의력결핍 과잉행동장애, 우울 그리고 자살 사고의 관계
이동윤(Dong-yun Lee),이철순(Cheol-Soon Lee),박철수(Chul-Soo Park),김봉조(Bong-Jo Kim),차보석(Bo-Seok Cha),이소진(Sojin Lee),서지영(Ji-Yeong Seo) 대한생물치료정신의학회 2012 생물치료정신의학 Vol.18 No.2
Objectives:The aim of this study was to evaluate the relationship among adult Attention Deficit and Hyperactivity Disorder(ADHD) symptoms, depressive symptoms, anxiety symptoms and suicide idea in Korean soldiers. Methods:We investigated past and present symptoms of ADHD(Korean-Wender Utah rating scale and Korean adult attention-deficit/hyperactivity disorder scale), depression(Beck’s Depression Inventory), anxiety(Beck’s Anxiety Inventory) and suicide idea(Beck Suicide Ideation Scale) in 92 Korean soldiers who had been experienced maladjustment and had visited in the medical unit of Army. Pearson correlation analysis, path analysis and structured equation model were used to find the relationship among these factors using SPSS 18.0 and AMOS 19.0 program. Results:There were significant relationships among past and present symptoms of ADHD and depression, anxiety and suicide idea(p<0.01). The regression analysis revealed that depression affected suicide idea(β=0.64, p<0.01). The path analysis showed that the impact of past and present symptoms of ADHD affected on suicide idea via depression( p<0.05, CFI=0.92, TLI=0.62, IFI=0.92, NFI=0.91). Conclusion:The symptoms of ADHD might make a fundamental role in development of suicide ideation via emotion like depression in Korean soldiers.
PWM 컨버터를 위한 향상된 ZVZCS Commutation Cell
이동윤(Lee Dong-Yun),유승희(Ryu Seong-Hee),현동석(Hyun Dong-Seok),최익(Choy Ick) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this paper, a modified ZVZCS(zero-voltage/ zero-current switching) commutation cell with minimum additional components, which provides soft switching at both turn-on and turn-off of maio and auxiliary switches as well as diodes In PWM converters, is presented The proposed soft-switching technique is suitable for not only minority but also majority carrier semiconductor devices The auxiliary switch of the proposed ZYZCS commutation cell is In parallel with the main switch, and therefore, there IS no current stress on the main switch and diode The operation principles of the proposed ZYZCS commutation cell are theoretically analyzed using the PWM boost converter topology as an example Theoretical analysis, simulation and experimental results verify the validity of the PWM boost converter topology with the proposed ZYZCS commutation cell.