• 설비공학논문집
• /
• 제2권2호
• /
• pp.137-141
• /
• 1990

When the relative humidity is measured with an aspirated psychrometer, three factors, which affect the measurement of relative humidity, are atmospheric pressure, the size of wet element and the wind velocity. This paper investigated the effects of the above three factors, and the computer code was developed in order to enhance the accuracy of the relative humidity measurement. As results, it is found that the relative humidity decreases by 6%RH with increasing atmospheric pressure from 650 mbar to 1100 mbar. It is found that the relative humidity drops down when the size of the wet element increases, though the effect of the size of the wet element is not significant. Finally, relative humidity increases with the increasing wind velocity. The difference between the psychrometic table in the present KS and the present results is about 2%RH maximum. As a conclusion, the three factors mentioned above should be considered in order to secure accurate measurement of relative humidity.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
• /
• pp.307-310
• /
• 2005

The effects of deformation properties on the bond of steel reinforcing bars to concrete are experimentally studies to expect the lap splice strength. Based on the previous research about relative rib area, lap splice strength between reinforcing bars and concrete can be improved by the control of rib height and spacing. This paper describes the testing and analysis of 15 beam-spliced specimens containing D25, D22, D19 with relative rib areas ranging from 0.066 to 0.162. The tests are analyzed to determine the effect of relative rib area(Rr) on the increase in bond strength. The tests also provide a preliminary indication of the effect of high relative rib area on the splice strength of uncoated bars.

• Bulletin of the Korean Chemical Society
• /
• 제22권8호
• /
• pp.877-882
• /
• 2001

The solvent effects on the relative free energies of Eu3+ to Yb3+ ion mutation in solution have been investigated using a Monte Carlo simulation of statistical perturbation theory (SPT). Our results agree well with available data that were obtained by others. Particularly, the results of water (SPC/E) solvent are almost identical with experimental data. For the present Eu3+ and Yb3+ ions, the relative free energies of solvation vs. Born’s function of bulk solvents decrease with increasing Born’s function of bulk solvents. There is also good agreement between the calculated structural properties in this study and the published works obtained by computer simulation and experimental work.

• 대한간호학회지
• /
• 제21권3호
• /
• pp.281-294
• /
• 1991

The purpose of this study was to determine the amount of soleus muscle atrophy in rats due to 28 days of decreased activity induced by hindlimb suspension, to observe the restoration of mass and relative muscle weight of the atrophied soleus muscle at day 28 of recovery to control value, and to compare the effect of run training on the mass and relative muscle weight of the atrophied soleus muscle at day 28 of recovery with that of sedentary rats. Adult female Wistar rats were maintained for 28 days with hindlimb suspension. Rats were then assigned randomly to a cage sedentary or running group. Soleus muscle mass and relative muscle weight following hindlimb suspension were compared with a control value. The soleus muscle mass and relative muscle weight of the running and cage sedentary groups following hindlimb suspension were compared with those of a control group. Soleus muscle mass and relative muscle weight of the run training group were compared with those of cage sedentary group. The results obtained were as follows : 1. Soleus muscle mass and relative muscle weight was reduced to 53.28% and 51.11% respectively by hindlimb suspension. 2. Soleus muscle mass and relative muscle weight of the training group t day 28 of recovery was restored to the control value. 3. Soleus muscle mass of the training group was greater than that of the cage sedentary group by 6.6% without statistical significance at day 28 of recovery. 4. Relative soleus muscle weight of the traning group was significantly greater than that of the cage sedentary group by 15.79% From these results, it may be concluded that run training during the posthypokinetic period facilitates the recovery of the atrophied soleus muscle mass of rats.

• Geomechanics and Engineering
• /
• 제36권2호
• /
• pp.167-181
• /
• 2024

The soil-structure relative stiffness is a key factor affecting the seismic response of underground structures. It is of great significance to study the soil-structure relative stiffness for the soil-structure interaction and the seismic disaster reduction of subway stations. In this paper, the dynamic shear modulus ratio and damping ratio of an inhomogeneous soft soil site under different buried depths which were obtained by a one-dimensional equivalent linearization site response analysis were used as the input parameters in a 2D finite element model. A visco-elasto-plastic constitutive model based on the Mohr-Coulomb shear failure criterion combined with stiffness degradation was used to describe the plastic behavior of soil. The damage plasticity model was used to simulate the plastic behavior of concrete. The horizontal and vertical relative stiffness ratios of soil and structure were defined to study the influence of relative stiffness on the seismic response of subway stations in inhomogeneous soft soil. It is found that the compression damage to the middle columns of a subway station with a higher relative stiffness ratio is more serious while the tensile damage is slighter under the same earthquake motion. The relative stiffness has a significant influence on ground surface deformation, ground acceleration, and station structure deformation. However, the effect of the relative stiffness on the deformation of the bottom slab of the subway station is small. The research results can provide a reference for seismic fortification of subway stations in the soft soil area.

• 미생물학회지
• /
• 제7권4호
• /
• pp.143-152
• /
• 1969

This investigation was proceeded to define the effects of gibberellic acid on the growth of Chlorella by determining the contents of chlorphyll and changes in various components in Chlorella cells according to the concentration of treated GA. The growth of Chlorella was accelerated with telative low concentrations of GA(10, 40 ppm) and was restrained with relative high concentrations of GA(70, 100, 200 ppm). The synthetic ability of chlorophyll of GA was inhibited generally in proportion to the concentration of treated-GA and the higher the concentration of GA was applied, the longer time was required in the restoration. The contents of RNA, protein and soluble carbohydrate were increased PCA-soluble amino acid and polysacharide were decreased in those cell components between the accelerated and restrained group. Consequently, the effect on accelerated growth in relative low concentrations of GA is considered to be caused by the powerful effet on expansion growth of GA. It is presumed that the effect of restrained growth in relative high concentrations of GA is due to the inhibitory effect on the chlorophyll synthesis.

• 펄프종이기술
• /
• 제42권3호
• /
• pp.37-42
• /
• 2010

The properties of paper are very susceptible to moisture content originated from relative humidity. This propensity of PVA impregnated paper was investigated in this study. Especially the hardening effect of borax treatment after PVA impregnation on the response of paper sample to the relative humidity was evaluated. When the moisture content was increased with the relative humidity, tensile stretch and tear resistance were increased while tensile strength and stiffness were decreased. A great increase in folding endurance of PVA impregnated paper sample was found at the higher relative humidity. The borax treatment could reduce the response of PVA impregated paper to the relative humidity.

• 한국산학기술학회논문지
• /
• 제19권5호
• /
• pp.418-425
• /
• 2018

본 연구의 목적은 유아의 배려행동에 미치는 공감능력과 대인관계형성능력의 영향을 알아봄으로써 유아교육 현장에서 유아의 배려행동을 증진시키기 위한 방안을 탐색하는 것이다. 연구대상은 중소도시 I시의 4,5세 유아 152명이며, 검사도구는 배려행동, 공감능력, 대인관계형성능력의 질문지를 활용하였으며, 교사에 의해 측정되었다. 수집된 자료는 pearson의 적률상관관계를 분석하고 단계적 중다회귀분석을 실시하였다. 연구결과는 첫째, 유아의 공감능력과 배려행동은 관계가 없는 것으로 나타났지만 배려행동 중 가치부여적행동과는 관련이 있는 것으로 나타났으며 특히, 가치부여적행동과 공간능력의 하위영역인 기쁨과 심적부담이 정적 관련이 있는 것으로 나타났다. 유아의 배려행동과 대인관계형성능력 전체는 관계가 있었으며, 특히 사회적 반응성과의 관계가 가장 높게 나타났다. 하위영역에서는 규범적 행동과 사회적반응성, 능동적행동과 지시따르기, 가치부여적행동과 긍정적 상호작용, 정서적행동과 사회적반응성과 가장 높은 정적 관계가 있음을 알 수 있다. 둘째, 배려행동 중정서적행동에는 사회적반응성이 정적인 예측변인이며, 관계형성하기는 부적 예측변인으로 나타났다. 능동적 행동에는 지시따르기가 정적예측 변인이며, 심적부담은 부적 예측변인으로 나타났다. 규범적 행동은 사회적반응성이 정적인 예측변인, 관계형성하기와 심적부담 부적 예측변인인 것으로 나타났다. 가치부여적행동에는 긍정적 상호작용이 정적 예측변인인 것으로 나타났다. 이러한 결과로 볼 때 유아의 배려행동을 증진시키기 위한 프로그램을 개발하기 위해서는 사회적 반응성, 지시따르기, 긍정적 상호작용을 증진시키는 내용을 포함해야할 것이며, 유아의 관계형성능력과 불안의 요소를 줄이는 내용을 구성해야 할 것으로 판단된다.

• 융복합기술연구소 논문집
• /
• 제10권1호
• /
• pp.1-5
• /
• 2020

The wake shapes behind wings in formation flight are very important to the aerodynamics and performances of aircrafts. In the present study, a discrete vortex methood is extended to handle the wake rollups behind multiple wings. It was found that the relative distance between the wings and the rotational direction of the wingtip vortices have significant effect on the movement of the wingtip vortices. When the wings are close to each other, the wingtip vortices moved faster than the wings of large relative distances. The vortex pair of opposite signs generated from each wingtip has an effect of moving the wingtip vortices upward. The relative height between the wings has an effect of moving the wingtips along the centerline of each vortex. The wakeshape behind multiple wings is a function of the relative distances and thus is dependent on the configuration of the formation flight. In the futhre, a study on the vortex movement pattern will be studied.

• Journal of Nutrition and Health
• /
• 제21권1호
• /
• pp.61-74
• /
• 1988

Ten college women were divided into 5 groups and treated in randomized block design for 5 weeks with 1 interval between treatments and subjects serving as their own controls. The experimental diets were corn oil diet as a source of n-6 linoleic acid, perilla oil diet as a source of n-3 $\alpha$-linolenic acid, and fish oil diet as a source of n-3 EPA and DHA. Dietary fat was supplied at 30% Cal and modified to give the total amount of saturated fatty acids and monoenoic acids at constant level. There was no significant effect on serum cholesterol level by different PUFA. However, on a gram-for-gram basis, there was a trend that the decrease in serum cholesterol was proportionate to the degree of fat unsaturation. On the other hand, only fish oil diet significantly decreased TG level but no significant effect on the relative proportion of TG in VLDL. The degree of hypotriglyceridemia did not corrleate with the degree of unsaturation. The relative proportion of CE in LDL was reduced by all PUFA diets but significant only by perilla oil diet. The relative amount of apoprotein in LDL was significantly reduced by n-3 PUFA. HDL-Chol content was significantly increased only in fish oil diet but no change in the relative proportion of its chemical components of HDL.