관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

생약추출물 섭취와 운동이 비만 Zucker 쥐의 혈청 IGF-1/IGFBP-3 수준에 미치는 영향

이헌규,조인호,양대승 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2

The purpose of this study was the investigation of the effect of embro and regular exercise on blood glucose. insulin and IGF-1 and IGFBP-3(Insulin Like Growth Factor Binding Protein) level against obese zucker ratfa/fa. In general. IGF-Ⅰ play important role in the regulation somatic growth. metabolism. cellular proliferation/differentiation. With insulin, IGF-Ⅰ is another regulation factor for blood glucose concentration. For this study, obese zucker rats(n=21) were divided into three group: the control(no exercise, CON, n=7), embro group(no exercise but supplement embro, emb개, n=7). and embro+exercise(n=7). Animals in exercise group were run on treadmill for 12week (5day/week^(-1), 1h^(-1)/day^(-1), 20m/min^(-1) speed). After 12 week, All animals (CON and EX) were anesthetized by sodium pentobarbital and blood was extracted and frozen for further analysis. Plasma glucose and insulin concentration were significantly decreased in embro and embro+ exercise than CON(P<.05). and Blood IGF and IGFBP-3 level were significantly increased in embro and embro+ exercise group(P<.05). Thus. These results suggest that embro and regular exercise may has protective effect in insulin resistance by controlling blood glucose and increasing IGF-1/ IGFBP-3 in obese zucker rat.

상수도 강관용 세라믹 코팅의 특성 분석

李豊憲,李揆鎭 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-

A ceramic coating of glass was deposited on a water supply steel pipe sample and its microstructure and chemical resistance were evaluated. Glass enamel coating was found to be relatively uniform over the substrate surface. However, a number of pin holes were observed due to the evolution of gases formed from the steel substrate. Iron oxide was present along with glass in the coating, as a result of oxidation of the substrate exposed by pin holes. The chemical resistance tests showed that the coating has less chemical resistance than industrial coating reported in the literature. This resulted from the chemical composition of the enamel glaze used in this study.

경량골재 형성에 미치는 폐 FRP의 열분해 특성

李豊憲,李揆鎭 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

In order to utilize waste FRP as lightweight aggregates, waste FRP was thermally decomposed in N2 and air atmospheres. Thermal analysis and ball milling of the decomposed FRP were carried out and the results were evaluated with respect to forming and foam structure of the aggregate. The decomposed FRP containing char and glass fiber was found to be milled with ease and formed into aggregate. Decomposition of FRP in N2 atmosphere resulted in a large amount of char, which remained during firing due to glassy phase formed. However, decomposition in air reduced the amount of char and resulted in foam structure with isolated pores and low density. The results of thermal analysis indicate that porous lightweight aggregates can be fabricated by controlling the amount of char and adding a foam agent.

흉부 유연성 운동이 척추측만증 환자의 폐활량과 흉곽 확장에 미치는 영향

심재훈,오덕원,이규완 한국전문물리치료학회 2002 한국전문물리치료학회지 Vol.9 No.2

The objectives of this study were to investigate the effects of thoracic flexibility exercise on chest function and mobility and to provide the information of physical therapy for patients with idiopathic scoliosis. Forty female subjects who were diagnosed with scoliosis participated in this study and were divided into the experimental and control groups. The experimental group consisted of 20 patients who were treated with thoracic flexibility exercise program during the admission (10 days) and one month after discharge. The control group consisted of 20 patients who were not treated with thoracic flexibility exercise program. Vital capacity was measured using a respirometer. The chest expansion were calculated using differences of chest circumference between maximum inspiration and maximum expiration measured under armpits, at the junction between the sternum and xyphoid process, and at the waist. All subjects were measured two times: before the admission and at one month after discharge. Data were compared by groups using independent t-test. Vital capacity and chest expansion values (the armpit, chest and waist values) were significantly higher for the experimental group compared to those of the control group (p<.05). The findings of this study show that thoracic flexibility exercise program can lead to an increase in vital capacity and chest expansion and has a positive effects in relieving symptoms and restoring thoracic mobility.

TMS320F240을 이용한 PWM 인버터 유도전동기 구동 시스템의 전도노이즈 저감을 위한 스위칭 기법

朴奎炫,金利勳,元忠淵,金奎植,崔世琓,咸年根 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-

PWM 인버터에 의해 구동되는 유도전동기에 발생되는 고주파 커먼 모드 전압은 전도성 EMI, 전동기 접지전류, 베어링 전류 및 다른 원치 않는 결과의 주원인이 된다. 인버터 제어의 무효벡터 스위칭 상태는 나머지 유효벡터 스위칭 상태에 비교하여 큰 커먼 모드 전압을 일으킨다. 그러므로 이 논문은 커먼 모드 전압을 완화하는 스위칭기법을 다룬다. 즉 정현파 PWM기법을 기본으로 한 커먼 모드 전압 제거방법을 제안하였다. PWM 신호는 각각의 정현파 기준신호와 120˚위상차가 나는 3개의 캐리어 파형과 비교하여 발생된다. 시뮬레이션과 실험적결과는 제안된 PWM 기법에서 커먼 모드 전압이 종래의 PWM 기법보다 약 66% 더 저감됨을 보였다. High frequency common mode voltage produced by PWM inverter fed induction motor is a major cause of conducted EMI. creation motor ground currents, bearing currents and other hamful products. The zero switching states of inverter control invoke large in comparison with the non-zero switching state of inverter control. We proposed a common mode voltage reduction method based on sinusoidal PWM technique. PWM signal are generated by comparing respective sinusoidal reference signal with three triangular carrier wave displaced of 120˚. Simulation and experimental result show that common mode voltages in the propsed PWM technique are reduced by approximate 66% more than conventional PWM technique.

방사선 처리에 의한 폴리비닐 알콜의 생분해도 개선

정진호,박남용,조훈제,이선미,김정규 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3

Radiation treatment with gamma-rays and electron-beams was used to remove polyvinyl alcohol(PVA), one of the main components of dyeing wastewater. PVA was effectively decomposed by radiation treatment, thus the removal was near 100% at an initial PVA concentration of 44 ㎎/L. However, total organic carbon(TOC) removal was less than 5% due to lower transformation of PVA to CO₂. This directly indicates the radiation treatment alone is not appropriate for the complete decomposition of PVA. In this sense, the improvement of biodegradability(BOD_5/COD) of PVA by radiation treatment was studied. Both gamma-ray and electron-beam treatments significantly increased the biodegradability of PVA by transforming non-biodegradable PVA to biodegradable by-products. This suggests radiation treatment, especially electron-beam treatment that showed better improvement of biodegradability, can be used as a pre-treatment of biological degradation process of PVA.

To-infinitives vs. Gerunds in Spoken and Written English

Gyu-Hyeong Lee,Yong-hun Lee 사단법인 한국언어학회 2018 한국언어학회 학술대회지 Vol.2018 No.12

Incidence and Risk Factors of Recurrent Venous Thromboembolism after Pulmonary Embolism

( Hun-gyu Hwang ),( Won-il Choi ),( Bora Lee ),( Choong Won Lee ) 대한결핵 및 호흡기학회 2019 Tuberculosis and Respiratory Diseases Vol.82 No.4

Background: Information about the epidemiology of venous thromboembolism (VTE) recurrence in Korea is lacking. The purpose of this study was to investigate VTE cumulative recurrence rates and identify risk factors for VTE recurrence among Korean adults. Methods: A retrospective cohort study was conducted on adult patients (≥18 years) admitted to a university teaching hospital for pulmonary embolism (PE) from 2005 to 2013. The main outcome of interest was a recurrence of VTE. We used Cox proportional hazard regression analyses to calculate the relative risk of VTE recurrence. Results: Five-year cumulative incidence of recurrent VTE events was 21.5% (95% confidence interval [CI], 17.7-25.4) in all cases of PE; 17% after provoked and 27% after unprovoked PE. Multivariate analysis showed that body mass index (BMI) of ≥25 (hazard ratio [HR], 2.02; 95% CI, 1.17-3.46; p=0.01) and longer anticoagulation therapy duration (HR, 0.90; 95% CI, 0.84-0.96; p<0.01) were independently associated with risk of VTE recurrence. Risk factors not found to be statistically significant at the <0.05 level included history of VTE (HR, 1.81; 95% CI, 0.84-3.88; p=0.12), unprovoked PE (HR, 1.70; 95% CI, 0.89-3.25; p=0.10), symptomatic deep vein thrombosis (HR, 1.62; 95% CI, 0.89-2.94; p=0.10), and female sex (HR, 1.42; 95% CI, 0.78-2.55; p=0.24). We found that age, history of cancer, and other co-morbidities did not significantly affect the risk of VTE recurrence. Conclusion: Recurrence of VTE after PE is high. Patients with BMI ≥25 or reduced anticoagulation therapy duration have a higher risk of recurrent VTE.

사구체 여과율 측정을 위한 한국인의 신장 깊이에 관한 방정식 도출과 이용

이성용,김성훈,김현미,이형구,정현석,박영하,손형선,정용안,정수교,유이령,이해규 대한핵의학회 2000 핵의학 분자영상 Vol.34 No.5

Purpose: There is no established formula for estimating renal depths in Korean. As a result, we undertook this study to develop a new formula, and to apply this formula in the calculation of glomerular filtration rate (GFR). Materials and Methods: We measured the renal depth (RD) on the abdominal CT obtained in 300 adults (M:F=167:133, mean age 50.9 years) without known renal diseases. The RDs measured by CT were compared with the estimated RDs based on the Tonnesen and Taylor equations. New formulas were derived from the measured RDs in 200 out of 300 patients based on several variables such as sex, age, weight, and height by multiple regression analysis. The RDs estimated from the new formulas were compared with the measured RDs in the remaining 100 patients as a control. In 48 patients who underwent Tc-99m DTPA renal scintigraphy, GFR was measured with three equations (new formula, Tonnesen and Taylor equations), respectively, and compared with each other. Results: The mean values of the RDs measured from CT were 6.9 cm for right kidney of the men (MRK), 6.7 cm for left kidney of the men (MLK), 6.7 cm for right kidney of the women (WRK), and 6.6 cm for left kidney of the women (WLK). The RDs estimated from Tonnesen equation were shorter than the ones measured from CT significantly. The newly derived formulas were 12.813 (weight/height)+0.002 (age)+ 2.264 for MRK, 15.344 (weight/height)+0.011 (age)+0.557 for MLK, 12.936 (weight/height)+ 0.014 (age)+1.462 for WRK and 13.488 (weight/height)+0.019 (age)+0.762 for WLK. The correlation coefficients of the RD measured from CT and estimated from the new formula were 0.529 in MRK, 0.729 in MLK, 0.601 in WRK, and 0.724 in WLK, respectively. The GFRs from the new formula were significantly higher than those from the Tonnesen equation significantly, which was the most similar to normal GFR values. Conclusion: We generated new formulas for estimating RD in Korean from the data by CT. By adopting these formulas, we expect that GFR can be measured by the Gates method accurately in Korean.