• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
• /
• pp.501-504
• /
• 2004

This paper proposes degree of hydration based shrinkage prediction model of 40MPa HPC. This model shows degree of hydration which is defined as the ratio between the hydrated cement mass and the initial mass of cement is very closely related to shrinkage deformation. In this study, degree of hydration was determined by CEMHYD-3D program of NIST. Verification of the predicted degree of hydration is performed by comparison between test results of compressive strength and estimated one by CEMHYD-3D. Proposed model is determined by statistical nonlinear analysis using the program Origin of Origin Lab. Co. To get coefficients of the model, drying shrinkage tests of four specimen series were followed with basic material tests. Testes were performed in constant temperature /humidity chamber, with difference moisture curing ages to know initial curing time effect. Verification with another specimen, collected construction field of FCM bridge, was given in the same condition as pre-tested specimens. Finally, all test results were compared to propose degree of hydration based model and other code models; AASHTO, ACI, CEB-FIP, JSCE, etc.

• 한국주거학회논문집
• /
• 제17권6호
• /
• pp.27-35
• /
• 2006

The purpose of this study is to analyze about perception and preference degree of resident's for environmental moulding. We will find factors effected to utilization of residents. So we should extract characteristics in the way of an association factors. The analysis result of this study is as follows: First, We could know that they consider form and establishment position to be the most important factors a using environment moulding in a housing complex. Second, it is high that preference degree at environmental moulding of figurative shape located in front of main entrance harmonized with gardening. Third, it is high that preference degree at environmental moulding of abstract shape located in front of a pray ground. Finally, environment moulding of mixing form appeared highest preference degree at parking lot entrance location. As valued result of this thesis, the result of environment moulding and surrounding as harmony form is going to utilize to basic to establish in a housing complex. furthermore, This research increase dwelling peoples' satisfaction as well as arrangement of environmental moulding and is expected that is going to give affirmative effect that can enhance quality of a housing complex.

• 한국지반신소재학회논문집
• /
• 제6권3호
• /
• pp.1-7
• /
• 2007

풍화토의 특성은 다양한 풍화환경, 풍화도 및 영향인자에 따른 거동의 특이성 때문에 정밀한 접근에 있어서 한계를 가진다. 특히 국내 외의 연구는 퇴적토에 집중되어 있고 풍화토의 역학적 거동을 퇴적토의 관점에서 분석하려 하기 때문에 이러한 결과가 풍화토의 실제 거동과 일치하는지 판단하는데 무리가 있다. 본 연구에서는 인공적으로 풍화도를 변화시키는 실험의 초보단계로서 온도 변화에 따른 강도변화 특성을 규명하고자 한다. 이를 위하여 동결 융해 반복작용 후의 시료를 대상으로 실내시험을 실시하여 풍화도에 대한 화강풍화토의 모암별, 지역별, 특성변화를 살펴보았다.

• 대한화장품학회지
• /
• 제21권2호
• /
• pp.73-93
• /
• 1995

The effect of natural products(drug 1, drug 2) on hair growth of frontal scalp of ten stumptailed macaques was investigated in period of 12 months. Drug 1 conteins extracts of Angelica gigantis Radix ok. and drug 2 conteins extracts of Corm Fructus, etc. Photographs of close view of the frontal scalp were taken once every month and folliclogram analysis has been done at pretretment and on 5th, 10th and 12th month after treatment. Drug 1 showed only slight effect or no effect on hair growth and drug 2 exhibited a significant degree of hair regrowth, but the control group exhibited a definite degree of regrowth and increasing density of vellum hair. Also, the physiological parameters, such as body weight, blood pressure, heart rate, serum levels of androgens, hematological measures during the treatment of drug 1, drug 2, and vehicle, were within normal limits. It indicates the drug 2 is the possible appearance of new summit of hair growth.

• 보건행정학회지
• /
• 제20권3호
• /
• pp.36-57
• /
• 2010

The degree of income inequality deepened by health care expenditure was useful in assessing the health security level. This exploratory study was conducted to provide a basic evidence to prove the necessity of reinforcement the benefit coverage of South Korea's health security systems. Data from the Household Income and Expenditure Survey of Korea and Luxembourg Income Study were used. Income inequality indices before and after deduction of health care expenditure were computed, and the degree of the increase in the indices was compared among 13 countries. The degree of decrease against the effect of income inequality reduction policies by health care expenditure was determined. The relationships between the national characteristics and the increase in income inequality were examined. In South Korea, all income inequality indices increased after deducting health care expenditure, but the difference was not high compared to the mean of 13 countries. However, the degree of decrease against the effect of income inequality reduction policies by health care expenditure was high, compared to the mean of 13 countries. The proportion of public sector spending on health care proved to be statistically significant with the increase of income inequality indices (p<0.05). In the context of the continuous increase in health care expenditure, if benefit coverage of health security systems is not reinforced, income inequality will all the more increase due to health care expenditure. In the establishment of the policies for reinforcement of the benefit coverage, income inequality after deduction of health care expenditure should be continuously monitored.

• Journal of the Korean Wood Science and Technology
• /
• 제43권1호
• /
• pp.17-24
• /
• 2015

본 연구에서는 잣나무 목분의 탈리그닌 정도가 습식디스크밀을 이용한 해섬처리의 효율에 미치는 영향과 얻어진 해섬물의 성질을 조사하였다. 또한, 탈리그닌 정도가 종이의 인장강도 특성에 미치는 영향도 조사하였다. 탈리그닌의 정도는 아염소산나트륨과 초산을 사용하는 Wise법의 처리횟수를 달리함으로서 조절하였다. 탈리그닌 정도가 증가함에 따라 해섬효율은 향상되었으며, 디스크밀 처리횟수가 증가함으로서 섬유직경은 감소, 여수시간은 증가하였다. 또한 종이의 인장강도 및 탄성률도 탈리그닌 정도 및 디스크밀 처리횟수가 증가할수록 증가하였다.

• 한국결정성장학회지
• /
• 제13권3호
• /
• pp.117-121
• /
• 2003

염화 니켈과 마그네슘 스테아린산 혼합 분말로부터 수소환원 공정에 의하여 니켈 분말을 제조하고 반응온도 및 마그네슘스테아린산의 첨가에 따른 분말의 특성을 검토하였다. 마그네슘 스테아린산을 함유한 경우 과도한 입자 성장의 억제로 인하여 입경 감소 효과가 있었다. 마그네슘 스테아린산의 함유량이 증가함에 따라 이에 따른 액상량의 증가로 인하여 입경 감소와 입자들간의 응집 정도에도 영향을 주었다.

• 대한기계학회논문집
• /
• 제13권3호
• /
• pp.538-546
• /
• 1989

본 연구에서는 분사액체의 점도가 분무액적의 평균크기뿐만 아니라 표준편차 의 역수적 개념을 가지는 균일도에 주는 영향을 실험을 통하여 살펴보았다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집D
• /
• pp.292-297
• /
• 2001

This paper discusses the effect of varying LiBr solution circuits flow rates for a direct fired double effect commercial absorption chiller in the parallel flow configuration. The effects of solution flow rates have been investigated for generator, condenser, solution heat exchanger, absorber and evaporator. According to the result of this work, it was found that sensible heat rate of generator increases and refrigerant vapor generated in that decreases when inlet solution flow rate of that increases. As solution flow rate of absorber increases, the degree of superheat increases because of decreasing solution heat exchanger efficiency. The flashing vapor at the top of absorber increases in proportion to the degree of superheat whileas decreases cooling capacity inversely.

• 설비공학논문집
• /
• 제18권1호
• /
• pp.47-54
• /
• 2006

[ $CO_2$ ] and propane mixtures were chosen as promising alternative refrigerants and their performance potentials were evaluated experimentally in an air-conditioning system. Pure $CO_2$ and 85/15, 75/25 and 60/40 binary blends by the charged mass percentage of $CO_2/propane$ were selected as working fluids. The effect of the inlet temperature of the secondary fluids and degree of superheat on the cooling performance was tested and discussed. The charging amounts of refrigerants were adjusted to make the system show the maximum COP. Comparisons among different refrigerants were carried out on the same compressor speed basis for a given operating condition. In addition, the temperature gliding effect of zeotropic mixtures on the system performance were analyzed based on the drop-in test results.