• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2008.04a
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• pp.431-435
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• 2008

Geothermal heat pump system using standing column wells as their ground heat exchanger can be used as a highly efficient source of heating and cooling in massive buildings. But there is no case of a small scale residential house. So this study estimated heating coefficient of performance(COP) of geothermal heat pump system using standing column well type which is excellent in heat recovery in the residential house. As a result of analysis, The COP of heat pump is over average 6 and is excellent. And in consequence of making a comparative study according to the bleeding, the cop is higher in the case of bleeding. Therefore, bleeding affects the performance of the system. This study has shown performance result that stands on actual data. Therefore, this study provides ground data that needs when a low capacity of system designs for a residence with confidence elevation.

• Journal of Environmental Health Sciences
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• v.34 no.4
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• pp.333-341
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• 2008

In this study, the possibility and the optimal conditions for treating slurry type piggery wastewater using supercritical water oxidation were tested in the laboratory. The results could be summarized as follows; The slurry type piggery wastewater, which was diluted 50 times, was treated most effectively at the pressure of 300 bar, the temperature of $550^{\circ}C$ and the residence time of 10 minutes. The air saturated water was injected, as an oxidizing agent, and the removal efficiencies of $COD_{Cr}$, T-N, $NH_4^+$-N and T-Pattheoptimal conditions were 92, 40, 59 and 100%, respectively. Therefore, analte rnativemea suremu stbetaken to improve theremo valefficiency of the nitrogen compounds.

• Journal of the Korean Society of Safety
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• v.8 no.2
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• pp.44-50
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• 1993

The objective of this study was to investigate the extraction of chromium(Vl) ion in waste water through the liquid surfactant membrane with open-type Perforated Reciprocating-Plate Column. Extraction experiments were conducted to measure the effect of flow characteristics of continuous and dispersed phase and stroke velocity, sodium hydroxide concentraction in internal aqueous phase, sulfuric acid concentraction in outer phase, and residence time distribution and measured extraction velocity. The result of experiments showed that extraction velocity of chromium ion was maximum when stroke velocity was 180 1/min and dispersion phase velocity was 30m11min, continuous phase velocity was 20m1/min. Extraction velocity of chromium ion increased with increasing difference of hydrogen ion concentraction of dispersion and continuous phase and column stage decreased.

• Journal of the Korean Society of Combustion
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• v.7 no.1
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• pp.8-14
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• 2002

Measurements of global emissions, flame radiation and flame dimensions are presented for unconfined turbulent-jet and precessing-jet diffusion flames. Precessing jet flames are characterised by increases in global flame radiation and global flame residence time for methane and propane fuels, however a strong dependency of the NOx emission indices on the fuel type exists. The fuel type dependence is considered to be because soot radiation is more effective than gas-radiation at reducing global flame temperatures relative to adiabatic flame temperatures and reducing the NO production rate.

• Journal of the Korean Institute of Rural Architecture
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• v.15 no.3
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• pp.9-16
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• 2013

This paper aims to clarify the residential quarter organization and housing spatial form of fishing village in Jeonjang-po, Imja-do Island. The results are as follows. First, the place of residence in Jeonjang-po was located in the place having the south and the north seaside, and the road system was presented by form to connect the north and south. Second, the alley of these north and south direction has a dynamic scenery, but the alley of east-west courses has a horizontal scenery. Third, it is a characteristic that there is very more plottage than the building area of the residential quarters. The reason that plottage has a big is because inner court in the residential quarters are used as places such as the fishery works and the vegetable gardens. Finally, the fishing village house in Jeonjang-po is 4-bay type building is typical type when seeing from the front, and is to have entrance hall at the front of building.

• Journal of the Korean Society of Clothing and Textiles
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• v.20 no.1
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• pp.66-75
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• 1996

The purpose of the present study was to investigate relation.;hip between normative influence on clothing conformity and authoritarian personality, fashion interest, and clothing importance. The sample of this study consisted of 756 subjects assigned to eight groups according to sex, age and residence. In this study normative influence on clothing conformity, fashion interest, and clothing importance were measured by 20 Likert type questions adopted from previous research or developed for this study. Authoritarian personality was measured by Min's 35 Likert type questions. The data were analyzed by ANOVA, multiple regression and correlation. The results showed that 1) authoritarian personality, fashion interest, and clothing importance was positively related to normative influence on clothing conformity. Among these, fashion interest was the most significant varible. 2) Normative influence on clothing conformity varied by sex and age: that is, females conformed more than males, and younger sample conformed more than older sample.

• Journal of the Korean Society of School Health
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• v.32 no.1
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• pp.32-40
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• 2019

Purpose: The purpose of this study was to investigate the risk factors for addiction-related behaviors among Korean adolescents. Methods: The study's subjects were 60,040 middle and high school students who participated in the 14th (2018) Korea Youth Risk Behavior Web-based Survey. Frequency analysis, $x^2$ test, and multivariate logistic regression were conducted using SPSS 21.0. Results: The risk factors for addiction-related behaviors were sex, school type, living area, academic performance, economic status, residence type, health status, depression, perceived stress and sleep satisfaction. Conclusion: Addiction-related behaviors are associated with mental health. Therefore, in order to prevent addictive-behaviors of adolescents, it is necessary to develop strategies to prevent addictive-behaviors by improving their mental health.

• Journal of the Korean GEO-environmental Society
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• v.10 no.1
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• pp.5-14
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• 2009

This study is to analyze numerically the spatial behaviors of the solute transport in a spatially correlated variable-aperture fracture under the effective normal stress conditions. Numerical results show that the solute transport in a fracture is strongly affected by the spatial correlation length of apertures and applied effective normal stress. According to increasing spatial correlation length, the mean residence time of solute is decreased and the tortuosity and Peclet number (is a dimensionless number relating the rate of advection of a flow to its rate of diffusion) is also decreased. These results mean that the geometry of the aperture distribution is favorable to the solute transport as the spatial correlation length is increased. However, according to the applied effective normal stress is increased, the mean residence time and tortuosity have a tendency to increase but the Peclet number is decreased. The main reason that the Peclet number is decreased, is that the solute is displaced by one or two channels with relatively higher local flow rate due to the increment of contact areas by increasing effective normal stress. Moreover, based on numerical results of the solute transport in this study, the exponential-type correlation formulae between the mean residence time and the effective normal stress are proposed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.4031-4039
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• 2015

The problems related with blood supply shortage and the stability of blood transfusion are on the rise, as it is expected that the blood doners will decrease but the blood use amount for aged population will increase, owing to low birth and aged population increase. The purpose of this study is to analyze the hospital characteristics which affect patients receiving and non-receiving blood transfusion for the knee and hip total replacement arthroplasty. Data were collected from Health Insurance Review and Assessment Service's 2011 sample data, and 5,370 inpatients were abstracted from them. Logistic regression analysis was performed, using SPSS 20. Independent variables used are hospital characteristics variables and patient characteristics variables. Hospital characteristics variables are hospital type, ownership, residence and the number of usable beds, and patient characteristics variables are gender, age, severity, type of anesthesia, main diagnosis, whether or not of anemia and insurance class. At the result of this study, it was found that hospital type, region, gender, age, severity, main diagnosis and whether or not of anemia were the factors that mostly affected the blood transfusion for knee arthroplasty. And hospital type, residence, gender, age, severity, type of anesthesia and whether of not of anemia were the factors that mostly affected the blood transfusion for hip arthroplasty. In addition to that, it is expected that this research which analyzed the present state of blood transfusion and its influence factors are cost effective, and would make a good use of preliminary data for good quality of medical service.

• Korean Journal of Health Education and Promotion
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• v.18 no.1
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• pp.127-137
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• 2001

The study of home injury and injury prevention has been a neglected area of research and practice. This study has the following purposes: 1) to describe the pattern of home injuries; 2) to analyze the differences in injuries by social characteristics; and 3) to compare the impact of safety structure and action. The data were collected by person-to-person interviews with 450 residents living in Wonju area. The statistical methods used for the analysis were $\chi$2-test and multiple logistic regression. The results are as follows: 1) Whether or not a certain injury has occurred varies by household type. The elderly household reported more injuries than other types of household. 2) Using logistic regression method, we found that safety-related behavioral habit was statistically significant in predicting injury occurrence. However, residence type was not a statistically significant variable. This indicates that cognitive change strategy is more important than structural change strategy.