다양한 재료의 마찰계수를 고려한 중소규모 연성 개폐식 트롤리의 수직하중에 대한 적용성 평가

김윤진,이승재,이유한,황경주,Kim, Yun-Jin,Lee, Seung-Jae,Lee, Yu-Han,Hwang, Kyung-Ju 한국공간구조학회 2016 한국공간구조학회지 Vol.16 No.4

Middle size of membrane retractable roof is under 25m span which consists of various moving systems. Trolley is the system that leads the membrane to parking place, transferring the load from the membrane to structural cable. When membrane closes roof completely, thus, structural behavior of trolley, which may contain various material with different friction coefficients, should be investigated by vertical load. Nummerical simulation of trolley prototypes, in this research, was performed by incrementation of vertical load. Consequently, this paper studied proper friction characteristics and provided the effective inner materials of trolley.

기능성 신발 쿨핀(Coolfin) 착용이 발등 및 엄지발가락 혈액순환에 미치는 영향

김윤진,이동렬,상희선,이미남,박지원,Kim, Yun-Jin,Lee, Dong-Ryul,Sang, Hie-Sun,Lee, Mi-Nam,Park, Ji-Won 대한물리치료학회 2014 대한물리치료학회지 Vol.26 No.4

Purpose: This study aims to investigate the impact of a short walk putting on Coolfin shoes on the foot temperature rise and blood circulation. Methods: Twenty healthy adults participated in experiments in this study. All subjects walked respectively barefoot and putting on Coolfin shoes. Infrared imaging cameras were used to collect and analyze the data on the foot temperature. Results: As a result of this study, there were significant differences between the temperatures of the great toe and top of the foot after 20-minute walks with bare feet and in Coolfin shoes. Both the temperatures of the great toe and top of the foot decreased after a 20-minute walk in the barefoot condition, and there was a significant difference between them (p<0.05). Both the temperatures of the great toe and top of the foot increased after a 20-minute walk in the condition of putting on Coolfin shoes, and there was a significant difference between them(p<0.05). Conclusion: A short walk putting on Coolfin products induces the movement of the toes to increase the blood flow and accordingly, has a direct impact on the increase of the surface temperature of the feet, so they are effective products for helping blood circulation in the feet.

일어서기 동작 시 발 뒷굽의 형태가 하지 관절 움직임에 미치는 영향

김윤진,박지원,Kim, Yun-Jin,Park, Ji-Won 대한물리치료학회 2013 대한물리치료학회지 Vol.25 No.2

Purpose: The purpose of this study was to investigate changes in movement strategies of lower limb joints depending on the type of heel during sit-to-stand. Methods: Twenty healthy females participated in this study. All subjects performed sit-to-stand three times each with three different types of heels - bare feet, 9 cm high-heeled shoes, and unstable shoes. Trails were conducted in random order. Three-dimensional motion analysis systems were used for collection and analysis of the kinematic data of lower limb movements. Results: Results of this study showed kinematic differences in pelvis, hip joints, knee joints, and ankle joints during sit-to-stand based on the type of heels. At the initial sit-to-stand, hip joint flexion, knee joint flexion, ankle joint flexion, and ankle joint inversion showed significant differences. The maximal angles of hip joint flexion, hip joint adduction, knee joint flexion, ankle joint flexion, and ankle joint inversion were significantly different, while hip joint adduction, pelvic forward tilt, hip joint rotation, knee joint flexion, ankle joint flexion, and ankle joint inversion differed significantly during the terminal of sit-to-stand. Conclusion: Therefore, the type of heel played an important role in selection of lower limb movements during sit-to-stand which were essential parts of daily life movements.

대한민국국제물주간 (Korea International Water Week: KIWW) - '지속가능발전을 위한 워터파트너십'

김윤진,Kim, Yun-Jin 한국수자원학회 2017 물과 미래(한국수자원학회지) Vol.50 No.10

주빈국, '기관지원'에서 '상품'으로 인정 받는 계기

김윤진,Kim, Yun-Jin 대한출판문화협회 2005 출판저널 Vol.359 No.-

HsCRP와 맥파전달시간에 대한 연구

김윤진,민홍기,김영주,전아영,전계록,예수영,Kim, Yun-Jin,Min, Hong-Gi,Kim, Young-Joo,Jeon, Ah-Young,Jeon, Gye-Rok,Ye, Soo-Young 한국생명과학회 2007 생명과학회지 Vol.17 No.2

The purpose of this study is to evaluate the relationship between high sensitive C-reactive protein (hsCRP) and pulse transit time (PPT). Apparently healthy 233 subjects had been enrolled in the health promotion center of the Pusan National University Hospital from Jan. 29 to Feb. 26, 2004. They had no previous history of diabetes, hypertension and hyperlipidemia. Subjects were categorized according to tertiles of hsCRP level [Group 1: first tertile $(0.01\;{\sim}\;0.02\;mg/dl)$, Group 2: second tertile $(0.03\;{\sim}\;0.05\;mg/dl)$, Group 3: third tertile $(0.06\;{\sim}\;0.12\;mg/dl)$, and Group 4: Fourth tertile $(0.13\;{\sim}\;16.8\;mg/dl)$]. PTT body mass index (BMI), total cholesterol (T-C), LDL-cholesterol(LDL-C), blood sugar (BS), systolic blood pressure (sBP) and diastolic blood pressure (dBP) were significantly different among hsCRP groups (p<0.05). HsCRP is positively related with BMI, tryglyceride (TG), LDL, sBP and dBP (p<0.05), and negatively related with PTT and HDL-cholesterol (HDL-C) (p<0.05). PTT is significantly negatively related with hsCRP, T-C, TG, LDL-C, BS, dBP and sBP (p<0.05). The hsCRP and PTT were related before controlling BMI, T-C, LDL-C, sBP, and dBP, but not related after conkolling. The relationship between hsCRP and PTT depends on cardiovascular disease risk factors. 동맥경화정도를 반영하는 hsCRP (high sensitive C-reactive protein)와 경화 정도에 의한 혈류속도의 변화를 반영하는 맥파전달시간 (pulse transit time, PTT)와의 임상적 연관에 대해서는 잘 연구되어 있지 않다. 이에 본 연구에서는 hsCRP와 PTT의 연관에 미치는 영향 요인을 알아보고자 하였다. 2004년 1월 29일에서 3월 2일까지 부산의 한 대학병원 건강증진센터의 수진자중에 당뇨와 고혈압 고지혈증 경력이 없는 20세 이상의 성인 233명을 대상으로 PTT을 측정하고, hsCRP와 관련 변수에 대한 검사를 실시하여 관련성을 분석했다. 연구군은 hsCRP값에 따라 4분위군으로 나누었다. 각 군의 중앙값과 범위를 보면 1분위군은 0.02 mg/이 (0.01 ${\sim}$0.02), 2분위군은 0.04 mg/이 (0.03 ${\sim}$ 0.05), 3분위군은 0.08 mg/이 (0.06 ${\sim}$ 0.12), 4분위군은 0.24 mg/이 (0.13 ${\sim}$ 16.8)이었다. 각 군에 따른 PTT와 체질량지수, 혈중지질, 혈당, 혈압의 차이를 일원분석을 할 결과 HDL 콜레스테롤을 제외한 모든 변수가 유의한 차이를 나타내었다 (p<0.05). 상관분석에서 hsCRP는 체질량지수, 총콜레스테롤, 중성지방, 저밀도콜레스테롤, 수축기와 이완기혈압에 양의 상관관계가 있었고 (p<0.05), PTT와 저밀도콜레스테롤과는 음의 상관관계가 있었다 (p<0.05). PTT는 hsCRP, 총콜레스테롤, 중성지방, 저밀도콜레스테롤, 공복혈당, 이완기혈압, 수축기혈압과 음의 상관관계가 있었으며 (p<0.05), 고밀도 콜레스테롤과는 상관관계가 없었다. 독립변수를 hsCRP군으로 하고, 반응변수를 PTT로 한 일반선형모델의 단변량 분석결과 hsCRP군에 따라 PTT가 유의한 차이가 있었고 (p<0.05), 연령과 성별을 통제한 후에도 유의한 차이가 있었다 (p<0.05). 연령과 성별 외 체질량지수, 총콜레스테롤, 저밀도콜레스테롤, 수축기혈압, 이완기혈압을 함께 통제한 후에는 유의한 차이가 없었다.

언더필용 에폭시 수지 조성물의 경화 및 유변학적 거동

김윤진 ( Kim Yun Jin ),박민 ( Park Min ),김준경 ( Kim Jun Gyeong ),김진모 ( Kim Jin Mo ),윤호규 ( Yun Ho Gyu ) 한국고무학회 2003 엘라스토머 및 콤포지트 Vol.38 No.3

Imidazole 촉매의 종류에 따른 bisphenol-F계 에폭시(Diglycidyl ether of bisphenol F)/nadic methyl anhydride 수지 시스템의 경화 및 유변학적 거동이 시차주사열량계(differential scanning calorimeter)와 회전 점도계를 사용하여 연구되었다. 경화반응기구를 분석하기 위해서 몇 개의 등온경화온도에서 등온시험이 수행되었다. Bisphenol-F계 에폭시/anhydride 조성물의 경화곡선은 전환량이 20∼40%일 때 최대 값을 보이는 자체촉매반응을 나타내었다. 속도상수(k₁, k₂)는 온도 의존성을 가지나 반응차수(m+n)는 온도 의존성이 없었으며, 반응차수는 거의 3으로 계산되었다. 촉매의 종류에 따라 두 개의 반응기구를 가지고 있었다. G′-G″ crossover 방법을 통해 겔화 시간을 측정하였으며, 이 결과로부터 활성화에너지를 구하였다. 용융 실리카를 첨가한 조성물의 유변학적 거동으로부터 온도와 충전제 함량에 따른 겔화 시간의 대수 변화가 직선적인 관계를 나타낸다는 것을 알 수 있었다. 고충전된 에폭시 수지 조성물은 전형적인 준소성 거동을 보였으며, 최대충전밀도가 클수록 점도는 낮아졌다. The cure and rheological gehavior of diglycidyl ether of bisphenol F/nadic methyl anhydride resin system with the kinds of imidazole were studied using a differential scanning calorimeter (DSC) and a rotational rheometer. The isothermal traces were employed to analyze cure reaction. The DGEBF/anhydride conversion profiles showed autocatalyzed reaction characterized by maximum conversion rate at 20∼40 % of the reaction. The rate constants (k₁, k₂) showed temperature dependance, but reaction order did not. The reaction order (m+n) was calculated to be close to 3. There are two reaction mechanisms with the kinds of catalyst. The gel time was determined by using G`-G`` crossover method, and the activation energy was obtained from this results. From measurement of rheological properties it was found that the logarithmic gelation time of fused silica filled DBEBF epoxy compounds linearly increased with the content of filler and decreased with temperature. The highly filled epoxy compounds showed typical pseudoplastic behavior, and the viscosity of those decreased with increasing maximum packing ratio.

임상연구 : Propofol의 목표 효과처 농도 조절주입으로 기관내삽관 시 혈역학적 변수와 Auditory Evoked Potential Index의 변화

김윤진 ( Yun Jin Kim ),백희정 ( Hee Jung Baik ),김종학 ( Jong Hak Kim ) 대한마취과학회 2003 Korean Journal of Anesthesiology Vol.45 No.5

임상연구 : 양측 슬관절 전치환술 후 시행한 수술 후 혈액회수법의 효과

김윤진 ( Yun Jin Kim ),백희정 ( Hee Jung Baik ),김종학 ( Jong Hak Kim ),유은영 ( Eun Young Yu ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.1

Background: This study investigated the clinical usefulness of an autotransfusion of drained blood using postoperative wound drainage and a reinfusion system to reduce the allogenic blood transfusion without complications. Methods: Eighty patients were allocated randomly to either a control group using a standard drainage system or an autotransfusion group using postoperative wound drainage and a reinfusion system. The collection period was 12 h, and the drainage blood retransfused after 6 h, or a maximum of 500 ml of blood was collected after connecting the reinfusion system. Immediately before reinfusion, blood samples were taken from the reinfusion system and analyzed for the functional and metabolic status of the drained blood and compared with the preoperative values of patient. The hemoglobin level, blood loss, allogenic blood requirement and transfusion-related complications were assessed. Results: The drained blood had lower hematological values, a prolonged PT and aPTT, a lower fibrinogen, and metabolic acidotic status than the preoperative values of the patients. There were no significant differences in the amount of blood loss compared with the control group. However, the autotransfusion group required significantly less allogenic blood (almost 20% less) without significant complications. Conclusions: Autotransfusion by reinfusion with drained blood in bilateral total knee arthroplasty reduces the allogenic blood requirement without significant complications. (Korean J Anesthesiol 2006; 51: 29∼35)

가스터빈(V84.3A) 2단 Blade의 운전특성변화에 따른 Squealer Tip에서의 손상연구

김윤진(Yun Jin Kim),손호성(Ho Seong Son),조형희(Hyung Hee Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.6