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한국인 대학생군 대상의 청.장년층 대사이상증후군 위험성 평가
정재훈,이보름,임성진,장제관,이명구,이종길,임성실,Chung, Jae-Hun,Lee, Bo-Reum,Lim, Sung-Jin,Jang, Je-Kwan,Lee, Myung-Koo,Lee, Chong-Kil,Lim, Sung-Cil 대한약학회 2009 약학회지 Vol.53 No.1
Metabolic syndrome, defined as the clustering of several metabolic disorders including obesity (waist circumference ${\geq}90$ if male or ${\geq}80$ if female, cm), dyslipidemia ($TG{\geq}150$ or HDL-C<40 if male or <50 if female, mg/dl), hypertension ($BP{\geq}130/85mmHg$) and hyperglycemia (fasting plasma $glucose{\geq}110mg/dl$), increases the cardiovascular risk of the general population. Recently, risk of this syndrome arises in young adults world widely. Therefore, we randomly selected and evaluated the risk of metabolic syndrome of total 43 people (group I-22, group II-21) for 2 years. Group I was 22 peoples (15 males, 7 females) with age of 22 thru 35 year old (average 28 year old) and group II was 21 people (19 male, 2 female) with age of 22 thur 32 years old (average 24 year old) in Cheongju area from March 1st thru 30th of 2008 in Cheongju area from September 1st thru 30th of 2007 in order to find out how serious this phenomenon is in young adult of Korea. 13.95% (n=7) of total people has a metabolic syndrome by NCEP/ATPIII definition among this group (group I-6, group II-1). Those of 6 have 3 or over risk factor for metabolic syndrome such as obesity, hypertension, fasting blood glucose and hypetriglyceridemia at the same time (group I-5, group II-1). Group I have more risk factor because of more higher age than group II. Therefore we need aggressively to monitor and provide them for early diagnosis, educational programs and assistance for lifestyle changes in order to prevent metabolic syndrome among young adults.
정재훈(Jae Hoon Chung),박중열(Joong Yeol Park),박용수(Yong Soo Park),이문규(Moon Kyu Lee),이병두(Byoung Doo Rhee),이홍규(Hong Kyu Lee),고창순(Chang Soon Koh),민헌기(Hun Ki Min),조수헌(Soo Hun Cho),강문호(Moon Ho Kang) 대한내과학회 1989 대한내과학회지 Vol.36 No.3
N/A In order to evaluate the effectiveness of systemic hyperbaric oxygen (HBO) therapy on diabetic gangrene, we treated 11 patients with diabetic gangrene with HBO therapy and 7 without HBO therapy in 1988. Seventeen patients with diabetic gangrene were treated without HBO therapy in 1987. HBO was administered in 60-min sessions twice a day or in daily 75-min sessions (20±4 times) within a monoplace oxygen chamber pressurized at 2.5 atm. Clinical characteristics such as sex, age, diabetes duration, fasting blood glucose, HbA1c, severity of diabetic microangiopathy and macroangiopathy were comparable in the patients of 1987 and 1988. In 1988, 13 patients (72.2%) recovered or showed improvement, 2 patients (11.1%) showed no improvement, and 3 patients (16.7%) were amputated. By contraries, in 1987, 8 patients (47.0%) recovered or showed improvement, 8 patients (47.0%) were amputated, and the remaining patient (6.0%) expired. There was a significant difference in hospitalization period (days) between the groups (33.8±3.7 vs 60.1±7.1, p<0.05 by Wilcoxon rank sum test). However, the values of nerve conduction velocity, amplitude, and latency of electrophysiologic test performed before and after HBO therapy were not altered. We conclude that HBO therapy may be an effective modality for the treatment of diabetic gangrene.
해상용 등명기(LED-200) 일일 소비전력량[Wh/day] 산정
정재훈(Jae-Hoon Jeong),김종헌(Jong-Hun Kim),유충현(Chung-Hyun Yu),김현조(Hyun-Jo Kim),김종국(Jong-Kook Kim),권혁동(Hyuk-Dong Kwon) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
해상용 등명기의 일일 소비전력량 산정은 전원공급시스템 설계 시 중요한 변수가 된다. 항로표지용 등부표 운영 시 설계 오류로 인한 시스템 오동작으로 선박 안전사고가 발생한다면 지급해야 할 댓가는 실로 크다 할 수 있다. 본 논문에서는 이런 오류가 발생하는 것을 미연에 방지하기 위해, 설계 시 중요한 변수인 등명기의 실부하를 산정하여 근거자료로 제시하고자 한다. 실부하 산정에 필요한 계산 방법은 IALA(국제 항로표지 협회)에서 권고하는 기준을 따랐으며, 등명기별 소비전력은 그동안 주기적으로 시행되고 있는 등 명기 특성 검사에서 얻은 전기적 성능 DATA 통계를 이용하였다.
소형선박용 200마력급 Water Jet의 유동특성에 관한 수치해석
이중섭(Chung Seob Yi),정재훈(Jae Hoon Jeong),이종수(Jong Su Lee),윤지훈(Ji Hun Yun) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.1
Water jet propulsion system has low efficiency than screw propeller at low speed, but has been applied in high speed ship due to its better cavitation performance and high rotation capacity. In this study, a numerical analysis was conduct to understand the flow in the propulsion system of 200HP grade water jet for small ship. As the result, it could be confirmed that total pressure and force of the flow was increased through the impeller and the straight-ability of discharging flow to outlet was improved by guide vane. Also, the reliability of numerical analysis was secured by comparing peripheral velocity calculated by design values with that calculated by numerical analysis.
주사탐침열파현미경을 이용한 1 차원 나노구조체의 정량적 열전도도 계측기법
박경배(Kyung Bae Park),정재훈(Jae Hun Chung),황광석(Gwang Seok Hwang),정의한(Eui Han Jung),권오명(Oh Myoung Kwon) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.12
본 연구에서는 나노스케일의 공간 해상도를 가지는 주사탐침열파현미경(scanning thermal wave microscopy, STWM)을 이용하여 1 차원 나노구조체의 열전도도를 정량적으로 계측하는 방법을 제시한다. 먼저, 1 차원 나노구조체의 열확산도를 계측하기 위한 STWM 의 원리를 설명한 후, 정량적인 열확산도계측을 위한 이론적 해석 과정을 설명한다. STWM 을 이용한 본 계측기법은 열파가 이동한 거리에 따른 상대적인 위상지연만을 가지고 열확산도를 계측하여 열전도도를 구하기 때문에 탐침과 나노구조체 사이의 열접촉저항 및 나노구조체와 열원간의 열접촉저항의 영향을 받지 않으며, 나노구조체에 인가되는 정확한 열유속을 구할 필요가 없다. 따라서 기존의 측정 기법들에 비해 계측이 매우 단순하면서도 정량적인 계측이 가능하다. We present a method to quantitatively measure the thermal conductivity of one-dimensional nanostructures by utilizing scanning thermal wave microscopy (STWM) at a nanoscale spatial resolution. In this paper, we explain the principle for measuring the thermal diffusivity of one-dimensional nanostructures using STWM and the theoretical analysis procedure for quantifying the thermal diffusivity. The SWTM measurement method obtains the thermal conductivity by measuring the thermal diffusivity, which has only a phase lag relative to the distance corresponding to the transferred thermal wave. It is not affected by the thermal contact resistances between the heat source and nanostructure and between the nanostructure and probe. Thus, the heat flux applied to the nanostructure is accurately obtained. The proposed method provides a very simple and quantitative measurement relative to conventional measurement techniques.
공성훈(Kong Sung-Hoon),정재훈(Chung Jae-Hun),정성웅(Jeong Seong-Ung) 한국건축친환경설비학회 2008 한국건축친환경설비학회 논문집 Vol.2 No.3
There are many sunblocking structures for cultivating plants in Korea. But research results of plants cultivating structures are so limited relating to sunlight shading environment. Major research results are as following : 1) temperature distribution of interior zone is higher than exteriror zone 2) air velocity distribution of inlet zone is higher than exterior zone 3) trand of temperature distribution is unsymmetrical situation by air flow conditions.