저널 베어링으로 지지되는 회전축계의 동특성에 미치는 감쇠영향

윤대현,윤한익 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-

In order to analyze the vibration characteristics of a rotor-bearing system, the coefficients of dynamic characteristics of this system are studied in consideration of the design parameter of journal bearing. The coefficients of dynamic characteristics of a journal bearing are calculated for 5 DOF including the coefficient of mometum. For the natural frequency of a rotor-bearing system the damping effect was analyzed by transfer matrix method. The stiffness of a journal bearing is increased as the rotating speed of shaft increased. And the stiffness of a journal bearing has a tendency to decrease as the clearance increased. The natural frequency of a rotor-bearing system supported by a journal bearing is generally increased as the damping coefficients increased.

외과의사의 스트레스 해소법

윤대현 대한외과학회 2012 대한외과학회 학술대회 초록집 Vol.2012 No.11

The Relationship between Type D Personality and Suicidality in Low-Income, Middle-Aged Adults

윤대현,김석주,이종하,김표민,박두흠,류승호,유재학,하지현 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.1

ObjectiveaaLow-income adults are considered to be a group at high risk for suicide. We sought to examine the effect of type D personality and other socio-demographic factors on suicidality in low-income, middle-aged Koreans. MethodsaaIn total, 306 low-income, middle-aged Koreans [age: 49.16±5.24 (40–59) years, 156 males, 150 females] were enrolled from the Korean National Basic Livelihood Security System. Socio-demographic data, including employment status, income, health, marital status, and educational attainment, were gathered. Beck’s 19-item Scale for Suicidal Ideation (SSI) was applied to evaluate suicidality, and the DS14 was used to assess type D personality. ResultsaaUnemployment (p<0.01) and absence of spouse (p=0.03) predicted higher SSI scores independent of other socioeconomic factors. All type D personality scores [i.e., negative affectivity (NA), social inhibition (SI), and total score] predicted higher SSI scores independent of all socioeconomic factors (all, p<0.001). Subjects with type D personality had higher SSI scores (p<0.001), and the association between suicidality and socio-demographic factors (employment or physical health) could be found only in subjects without type D personality. ConclusionaaType D personality was a risk factor for suicide in low-income Koreans, independently from socio-economic factors. In addition, the socio-demographic factors were less prominently associated with suicidality in those with type D personality.

분뇨정화조에 대한 근본연구(2)

윤대현,Yun, Dae-Hyeon 대한건축사협회 1971 建築士 Vol.1971 No.5

한국 여성에서 우울증상과 혈당 조절의 연관성

윤대현,박진호,박민정,신찬수,조상헌,오병희,Yoon, Dae-Hyun,Park, Jin-Ho,Park, Min-Jeong,Shin, Chan-Soo,Cho, Sang-Heon,Oh, Byung-Hee 한국정신신체의학회 2006 정신신체의학 Vol.14 No.1

연구목적 : 우울증상은 여성에게 흔하며 적절한 혈당 조절은 당뇨병 치료에 있어 매우 중요하다. 당뇨병 환자에서 우울증은 상대적으로 흔히 발견된다. 그러나 아직 우울증과 혈당조절의 상호관계에 대해서는 명확히 밝혀진 바가 없다. 본 연구는 한국 여성 당뇨병 환자의 혈당 조절과 우울증상 사이의 상호관계를 평가하려 한다. 방법: 여성 당뇨병 환자 216명을 포함한 연구 대상자 4,567명을 대상으로 Beck 우울 척도와 장기 혈당조절 지표인 $HbA_{1c}$ 수치를 측정하여 우울증과 혈당조절간의 연관성을 분석하였다. 공복 혈당 수치와 비만도 지표인 체질량지수도 함께 측정하여 분석하였다. 임상적으로 우울증을 의심할 수 있는 분할점은 16점으로 하였다. 결과: 당뇨병 보유 여성군에서 우울 여성군이 유의미하게 많았고(P<0.001), Beck우울 척도 평균치도 통계적으로 유의하게 높았다(p<0.001). 우울 여성군에서 $HbA_{1c}$, 평균치 (p<0.01)와 공복 혈당 평균치 (p<0.05)가 유의미하게 높았고, 혈당 조절의 장애가 심할 수록 우울 여성군의 비율이 증가하는 경향을 보였다(p=0.001). 결론: 본 연구는 한국 여성에서 우울증상과 당뇨병 및 혈당 조절간 연관성이 존재함을 지지하는 결과를 보였다. 향후 종적 연구를 통한 우울장애와 당뇨병간 상호작용에 대한 원인-결과론적 이해가 요구된다. Backgrounds : Depression has been prevalent in women and maintaining optimal glycemic control is an important goal of diabetes management. Although depression is common in adults with diabetes, its relationship to glycemic control remains unclear, espacilly in Korean women. The current study examined the relationship of depressive symptomatology with glycemic control in Korean women. Methods : Beck depression inventory (BDI), $HbA_{1c}$ as an index of long-term glycemic control, fasting glucose level and body mass index (BMI) were measured in sample of 4,567 women of whom 4.7%, 216 women had diabetes, and the relationship between depression and glycemic control was analyzed. BDI Scores of 16 and above is a cut off point to indicate possible clinical depression. Results The frequency of depressed women (p<0.001) and the mean score of BDI (p<0.001) were significantly higher in diabetic women. The mean level of $HbA_{1c}$ (p<0.01) and fasting glucose (p<0.05) were higher in depressed women. There was a graded relationship between the percentile of depressed women and a degree of glycemic control impairment (p=0.001). Conclusion : The current study found the relationship of depressive symptomatology with glycemic control in Korean women. This relationship may be mediated by decreased self-care behaviors or by neurobiological dysregulation. Improving identification and treatment of depression in women with diabetes might have favorable effects on diabetic outcomes.

호수 외 1편

윤대현 세상의 모든 시집(시전문지 모든시) 2019 계간 모:든시 Vol.- No.8

How Many High Risk Korean Patients with Osteopenia Could Overlook Treatment Eligibility?

윤대현,최동혁,정현균,허주영,장영재,최용수 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.6

Study Design: Retrospective study. Purpose: To determine the prevalence of high risk patient with osteopenia requiring pharmacologic treatment and investigate the difference of 10-year fracture probability whether bone mineral density (BMD) include or not in Korean FRAX model. Overview of Literature: Many people with the fracture have osteopenia rather than osteoporosis, and BMD alone could be considered as a chance to prevent fracture. Methods: Three hundred sixty-nine patients who was diagnosed as osteopenia were divided into two groups according to age (group 1, under 65 years; group 2, over 65 years), and 10-year fracture probabilities were calculated by FRAX algorithm with and without femur neck T-score. Results: The high risk patients of the fracture who had above 3% of 10-year hip fracture probability were 15 cases in group 1 and 121 cases in group 2. In 193 patients of group 1, the mean 10-year fracture probability with BMD was significantly higher than the results without BMD (hip fracture: p =0.04, major osteoporotic fracture: p =0.01). Unlike the results of the group 1, the mean 10-year fracture probability without BMD was significantly higher than the results with BMD in 176 patients of group 2 (hip fracture: p =0.01, major osteoporotic fracture: p =0.01). Conclusions: Total of 136 cases (36.8%) as a high risk of the fracture with osteopenia could be overlooked treatment eligibility in Korean. The Korean FRAX model without BMD could be effective in predicting fracture risk especially in the individuals who were over 65 years.

X-선 회절을 이용한 비정질 Ta-IPA 괴상과 박막의 구조 비교에 관한 연구

尹大鉉,金和民 대구효성가톨릭대학교 자연과학연구소 1991 基礎科學硏究論集 Vol.1991 No.1

Sol-gel법을 통하여 만들어진 비정질 Ta-IPA 괴상과 박막을 25℃와 340℃로 열처리한 구조의 차이점과 구조수와의 관계를 TG-DTA, IR과 X-선회절 강도측정으로부터 구한 동경분포곡선 등을 이용하여 알아보았다. 각 시편들을 L-Ta_2O_5 결정의 물성 및 동경분포곡선(calc-RDF)과 비교하였다. 박막은 8면체-TaO_6로 괴상보다 작은 cluster로 구성되어 있었다. The structural variation process and relation of water of amorphous Ta-IPA bulk and thin film upon heat-treatment conditions of 25℃ and 340℃ have been studied by using the radial distribution functions (RDF_obs) estimated from the X-ray diffraction intensities, TG-DTA and Infrared spectrophotometer. The expected Ta-IPA structure was determined by comparing the RDF_obs with that for RDF_calc. The structure of specimens prepared by sol-gel method is basically based on the L-Ta_2O_5 crystal. Thin film of samples are mainly composed of octahedral TaO_6 and have smaller cluster than bulk samples.

테이프 COATING

윤대현 한국부식방식학회(구 한국부식학회) 1993 부식 및 방식 강습회 Vol.- No.-

국가중요시설 물리적 보안 조직 보안수준 평가지표 개발

윤대현,변서희,정창훈 한국정책학회 2020 한국정책학회 동계학술발표논문집 Vol.2020 No.-