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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.
한국 폐경 여성에서 경구 에스트로겐 종류에 따른 유방 치밀도에 대한 Medroxyprogesterone Acetate의 효과
이동윤 ( Dong Yun Lee ),최현진 ( Hyun Jin Choi ),최두석 ( Doo Seok Choi ),민용기 ( Yong Ki Min ),최연현 ( Yeon Hyeon Choe ),윤병구 ( Byung Koo Yoon ) 대한폐경학회 2010 대한폐경학회지 Vol.16 No.2
연구목적: 한국 폐경 여성에서 경구 에스트로겐 종류에 따른 medroxyprogesterone acetate (MPA)의 유방 치밀도에 대한 영향을 조사하였다. 연구재료 및 방법: Conjugated equine estrogen (CEE)+MPA 치료 (n=10) 및 estropipate+MPA 치료 (n=16)를 1년간 시행하여, 치료 전후의 X-선 유방촬영술상 유방 치밀도의 변화를 breast imaging reporting and data system (BI-RADS) 판독 및 J-image 프로그램을 이용하여 비치료 대조군 (n=27)과 함께 비교하였다. 결 과: 각 군간 기초 임상 특성의 차이는 없었다. 1년의 호르몬 치료 후, 대조군 (0%)에 비해 CEE+MPA (7/10, 70%; P<0.001) 및 estropipate+MPA (3/16, 18.8%; P=0.002) 치료군에서 유의한 유방 치밀도 증가가 관찰되었으며, CEE를 병합한 경우가 estropipate 병합군에 비해 높은 유방 치밀도 증가를 보였다 (P=0.033). NIH J image로 계산한 치밀 면적의 비율 변화는 대조군에서 0.66%, CEE+MPA 군에서 7.67%, estropipate+MPA군에서 1.48%로 차이를 보이는 경향이 있었다. 결론: 한국 여성에서 estropipate+MPA 치료는 CEE+MPA에 비해 유방 치밀도에 대한 자극 효과가 적으며, 유방 치밀도의 변화는 경구 에스트로겐의 성분에 따라 다를 수 있다. 향후 유방암 위험에 대한 추가 연구가 시행되어야 한다. Objectives: We determined if the impact of medroxyprogesterone acetate (MPA) co-administered with conjugated equine estrogen (CEE) or estropipate differed on mammographic density (MMGD) in Korean postmenopausal women. Methods: In this retrospective study, 53 healthy postmenopausal women without prior hormone therapy (HT) use were included. Smokers, habitual drinkers, women with a body mass index ≥27 kg/㎡, and women with a history of mammoplasty or breast cancer were excluded. HT using MPA (n=26) consisted of the following two groups: CEE (n=10) and estropipate (n=16). Twenty-seven untreated women served as the control group. Mammography was obtained at baseline and 1 year later, and MMGD was assessed based on the breast imaging reporting and data system (BI-RADS) by one radiologist who was blinded to treatment. In addition, the change in the proportion of the dense area after HT was assessed using the J-image program. Data were analyzed with analysis of variance and chi-square or Fisher`s exact test. Results: There were no significant differences in baseline clinical characteristics and MMGD among the three groups. After 1 year of HT, CEE (7/10 [70%]; P<0.001) and estropipate (3/16 [18.8%]; P=0.002) regimens significantly elevated the BI-RADS grade compared with controls (0%), and CEE induced a greater increase in MMGD than estropipate (P=0.033). In addition, the proportion of dense areas assessed using the J-image program increased more with the CEE regimen (7.67%) than the estropipate regimen (1.48%), but there was no statistically significant difference. Conclusion: Estropipate+MPA had a less stimulating effect on MMGD than CEE+MPA in Korean postmenopausal women. The change in MMGD induced with MPA might depend on the oral estrogen preparation. A further study on breast cancer risk based on combination HT is warranted.