• 한국구조물진단유지관리공학회 논문집
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• 제10권6호
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• pp.105-113
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• 2006

본 연구는 잔골재와 굵은 골재를 전량 플라이애쉬로 치환한 콘크리트의 공학적 특성을 밝히기 위한 실험적 연구의 결과이다. 그리고 플라이애쉬 전량 치환 콘크리트의 유동성 저하 문제를 추가수량($W_f$)으로 해결하고자 하였다. 실험은 물-시멘트 비($W_c/C$)를 0.35, 0.45 그리고 물-플라이애쉬 비($W_f/FA$)를 0.35, 0.45로 하였다. 플라이애쉬 치환은 P와 Q의 두 가지 방법으로 하였다. P 방법은 플라이애쉬와 첨가수량($W_f$)의 중량이 골재의 중량과 같은 배합법이다[$FA+W_f$ = G (또는 S)]. Q 방법은 플라이애쉬와 골재의 중량이 같고 첨가수량($W_f$)을 추가하는 배합법이다 [$FA+W_f$ > G (또는 S)]. 실험은 굳기 전 콘크리트의 특성과 3, 7, 28 및 91일 압축강도 특성을 측정하였다. 실험결과 압축강도는 $Wc/C=0.35$, $W_f/C=0.35$ 일 때, P 치환법 중에서 잔골재 치환이 다른 배합들보다 향상되었다. Q 방법은 P 방법에 비해 유동성은 향상되었으나, 압축강도는 그렇지 않았다. 실험결과는 잔골재와 굵은 골재를 플라이애쉬로 전량 치환한 콘크리트의 유동성과 강도 특성이 향상됨을 알 수 있었고, 플라이애쉬 치환방법으로 효과적임을 보여주었다.

• 한국초지조사료학회지
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• 제39권1호
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• pp.1-8
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• 2019

본 연구는 사양실험에 의한 회귀식 추정방법에 의해 교잡종(개량종) 번식용 암컷 흑염소의 육성기와 임신기 유지와 성장을 위한 에너지요구량을 구하기 위해 수행되었다. 번식용 암컷 흑염소 50두를 공시하여 사료의 대사에너지 수준을 육성기(5개월령)에는 각각 2.32(G1), 2.49(G2), 2.74(G3), 2.99(G4) 및 3.24(G5) Mcal/kg로 하여 2016년 5월부터 9월까지 진행하였으며, 임신기(9개월령 이후)에는 각각 2.32(P1), 2.43(P2), 2.55(P3), 2.66(P4) 및 2.78(P5) Mcal/kg로 하여 2017년 1월부터 4월까지 수행하였다. 실험사료는 염소용 TMR 사료를 이용하여 조단백질 수준을 14%로 고정시키고 에너지 첨가제(유락)를 이용하여 에너지 수준을 조절하였다. 건물 섭취량은 처리구 간에 육성기, 임신기 모두 유의성이 없었으며, 체중대비 1.5~2.0% 수준으로 조사되었다. 일당증체량은 육성기에는 46~69g, 임신기에는 150~190g으로 사료의 에너지수준이 증가함에 따라 높게 나타났으며, 사료요구율은 육성기 6.5~9.7의 범위로 에너지수준이 높을수록 사료요구율이 개선되는 경향을 나타내었다. 임신기의 경우 3.5~3.8의 범위로 에너지 수준에 따른 영향은 없는 것으로 나타났다. 대사 체중 당 에너지섭취량과 일당증체량 사이의 회귀분석을 통한 유지에너지 요구량 추정 시 육성기에는 $102.5Kcal/BW^{0.75}$이고, 임신기에는 $105.83Kcal/BW^{0.75}$로 나타났다. 급여 사료의 에너지 수준에 따른 번식성적은 에너지 수준이 높아질수록 분만율이 낮게 나타났으나 산자수와 생시체중의 경우 증가하는 경향을 보였다. 본 연구에서 도출된 결과는 향후 흑염소의 사양표준 설정을 위한 기초자료로 이용될 수 있을 것으로 사료되며, 앞으로 대사실험, 비교도축법 등 다양한 추정방법과 비교를 통해 정확도를 높이는 연구가 필요할 것으로 사료된다.

• 대한지역사회영양학회지
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• 제10권3호
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• pp.281-289
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• 2005

Hyperlipidemia and related heart disease will be growing public health problems as the population ages. It is therefore of great importance to identify modifiable risk factors. So this research investigated associations among life style, nutrient intake, and blood lipids in middle-aged men with borderline hyperlipidemia. Dietary intakes were assessed by food-frequency questionnaire and convenient method. The subject's histories of alcohol use and smoking were assessed via a questionnaire. Current smokers were classified as smokers, whereas past smokers and subjects who never smoked were classified as nonsmokers. With regard to alcohol intake, the subjects were stratified into drinkers and nondrinkers. In drinkers the frequency were measured. Frequency of alcohol intake and weight were associated with high blood lipids and blood pressure. The highest quartile of calcium intake had lower triglyceride concentration than did those in the lower three quartiles. High calcium intake was associated with low blood triglyceride concentration. These results suggest that healthy weight and high calcium intake and less alcohol intake can contribute to maintenance of healthy blood lipids in men.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.169-171
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• 2008

The brake systems of the rolling stocks are generally consisted of electrical and mechanical brake systems. Because of its inherent structure of the each brake system, the electrical brake system is mainly used at the high speed range while the mechanical brake system is used at the relatively lower speed range. It is desirable for the rolling stocks to apply the entire electrical brake system. However, since the brake force from electric brake system is not enough to stop the rolling stock within the legal stop distance. Therefore, the mechanical brake system is indispensable to rolling stocks. In general, the vast majority of the world trains are equipped with mechanical braking systems which use compressed air as the force to push block on to wheels or pads on to discs. These mechanical systems are known as air brake or pneumatic brakes. For the air brake system, basically huge scale air compressor is equipped and the long pipe line is complexively connected. Since mass of these air brake components, it is difficult to be a light weight equipment and the long pipe line raise the maintenance problem. In order to overcome these problems of air brake system, the hydraulic brake system is proposed in this research. The hydraulic brake system makes the whole weight of brake equipment be light and large braking force can be applied. Therefore, in this research, the validity and advantages of applying the hydraulic brake system are reviewed.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2009년도 추계학술발표대회 논문집
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• pp.213-216
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• 2009

The purpose of this study is analyzing temporal flow about 20 detailed performance items in the "Housing Performance Grading Indication System". This study try to figure out situations according grade in detailed performance item and to analyze change item about 112 cases(2 cases in 2006, 15 cases in 2007, 46 cases in 2008, 49 cases in 2009), from January 9, 2006 which system is undertaken, to October, 2009. This system consists of 5 main performance section, 14 performance categories and 20 detailed performance items. 5 main performance parts are Noise and Acoustics(Light-weight impact sound control, heavy-weight impact sound control, sound control of toilet, sound control of party wall), Long-life(flexibility, remodeling & maintenance, durability), Landscape & Indoor Environment(landscape, formaldehyde control & ventilation, daylighting, thermal environment), Welfare & Barrier-free(playground and community center, welfare space, barrier-free design), Fire Safety(fire safety, safe place, fire-resisting quality). Total efficiency about housing can understand systematically of 20 perfomance items though this research.

• 한방비만학회지
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• 제10권1호
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• pp.57-63
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• 2010

Objectives The purpose of this study is to investigate the clinical effect of oriental obesity therapy on morbid obese patient with Type 2 Diabetes. Methods Two cases of Type 2 Diabetes patient was treated with herbal medicine, electrolipolysis, dietetic therapy, and aerobic exercise during the treatment period. Results The diagnostic index (Weight, BMI, PBF, WHR, FPG, HgbA1C) was improved at the end of treatment. Conclusion The improvement of the patient with Type 2 Diabetes is identified through receiving oriental medical treatments, dietetic therapy, and aerobic exercises. Further research on medical treatments and long-term maintenance of weight loss for obese patients with Type 2 Diabetes should be needed in order to standardize the treatment methodology.

• 조명전기설비학회논문지
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• 제26권11호
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• pp.40-47
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• 2012

Most of existing wind turbine system is used with geared type; however, this type has lots of problems which are noisy, weight, maintenance and so on. In this paper, wind turbine system with fluid torque converter applied to solve these problems. In case of the proposed wind turbine system, it is possible to transmit torque to adaptable distance. So various sets including generator, inverter and auxiliary motor move from the nacelle to the ground. As a result, Total weight in Nacelle can be decreased. however, the efficiency can be decreased with fluid torque system. We also applied auxiliary motor to fluid torque system. So, we also realized rated revolutions and rated output windturbine and could get considerable good data.

• Journal of Electrical Engineering and Technology
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• 제13권6호
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• pp.2335-2343
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• 2018

This paper proposes an optimal damping control algorithm of the DTI (Direct Two-level Inverter) to miniaturize and reduce the weight of auxiliary power supply for railway vehicles. The conventional auxiliary power supply for railway vehicles uses a DC-DC converter to maintain the inverter input power from the line voltage smoothly. The proposed topology does not use a DC-DC converter for reducing of manufacturing and maintenance costs. It also proposes a DTI topology removed damping resistors that generate ground signal noise in a certain period. At this time, a resonance phenomenon of DC-link voltage occurs due to variation of the inductive load, and a method of controlling the resonance phenomenon of DC-link voltage is required. In order to suppress the resonance phenomenon of the DC-link voltage, at a point before resonance occurs, this paper introduces an algorithm to suppress the resonance phenomenon of DC-link voltage by compensating the resonance component of the q axis voltage of the synchronous reference frame. The proposed algorithm verifies the effect through simulation and experiment.

• Archives of Plastic Surgery
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• 제32권4호
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• pp.543-546
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• 2005

Pulmonary embolism is a one of the major cause of postoperative death. Surgery predisposes patients to pulmonary embolism, even as late as one month after the operation. The accurate detection of pulmonary embolism remains difficult, and the differential diagnosis is extensive. The prevention of pulmonary embolism is thus of paramount importance. We report a case of pulmonary embolism after coverage of pressure sore on the left ischium on the 8th day after operation. The patient was 60 years old, a severe smoker, in the high quantity of body mass index and had hypertension. The risk factors are 60 years of age or older who were in the highest quantity of body mass index. Heavy cigarette smoking and high blood pressure are also identified as risk factors. Plastic surgeons should keep the probability of pulmonary embolism development after operation in mind. When taking history, the risk factors should be checked certainly. The immobilization may explain the probability of pulmonary embolism development. Therefore absolute bed rest or positional maintenance should be avoided. Until recently, low molecular weight heparin has been used for preoperative prophylaxis. Plastic surgeons should be concerned in low molecular weight heparin for prophylaxis of the pulmonary embolism and study the indications and effectiveness in liposuction or abdominoplasty.

• 펄프종이기술
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• 제42권3호
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• pp.28-36
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• 2010

Today We have three full series of the annals of Joseon Dynasty. Taebaeksan volume which is one of them shows comparatively good maintenance but Taebaeksan volume also decomposed in patches. The size of cover and inner paper were increased in late Joseon Dynasty, but the weight, thickness and basis weight bears no relation to each other. The oxidation index of paper in annals of pre-periods of King Sunjo shows very high value. After the annals of King Sunjo, the oxidation index of paper is very similar to today's Hanji. L.a.b values of inner paper in the Taebaeksan volume are similar generally. The average length of fiber using image analysis soft ware is 8.08~9.92 mm, that like immediate value of measurement. The air fraction of fiber's range is 1.20~2.12%. It lower than today's Hanji. After considering the factors of the length of fiber, air fraction and FE-SEM, we reached that no difference between raw material of inner paper in the Taebaeksan volume.