• The Journal of the Korea Contents Association
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• v.17 no.3
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• pp.199-211
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• 2017

The notable findings are as follow: First, men show higher level of perceiving open marriage, sex-role, acceptance of extra-marital relationship and intention of extra-marital sex than that of women. Second, the effects of men's perception of sex-role and open marriage, and the acceptance of extra-marital relationship have direct effects on their intention of extra-marital sex. The acceptance of extra-marital relationship shows the mediation effect on the path between that of open marriage and extra-marital sex among men. However, men's perception of sex-role does not affect the acceptance of extra-marital relationship. Lastly, women's perception of sex-role and open marriage, and the acceptance of extra-marital relationship directly influence the intention of extra-marital sex each, including the mediating effect of accepting extra-marital relationship between that of open marriage and extra-marital sex which are similar to the men's trend. Women's perception of sex-role show the direct effect on the acceptance of extra-marital relationship unlike man's trend. Therefore, the fact demonstrates that the effect of perceiving of sex-role on the intention of extra-marital sex is different according to gender. Some practical and political implications are discussed based on the study's findings.

• Journal of the korean academy of Pediatric Dentistry
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• v.27 no.1
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• pp.24-31
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• 2000

The purpose of study was to compare the laser fluorescence detection by Diagnodent(KaVo, Germany), visual inspection using dental explorers, and conventional dental radiography as diagnostic tests for dental caries. One hundred and three human premolars and molars which had no caries or fissure caries were tested by the three methods. Diagnodent scores increased as the scores of the other two tests increased(P<0.01) There were significant relationships between visual inspection scores and Diagnodent scores(Pearson 0.676, Spearman 0.694) and between radiography scores and Diagnodent scores(Pearson 0.623, Spearman 0.658) (P<0.01, all). Diagnodent test proved to have high sensitivity and low specificity and more studies are necessary to present the diagnostic criteria for progressive caries stages.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.12 no.4
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• pp.227-233
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• 1983

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2565-2571
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• 2009

In this paper, cycle performance analysis of cascade refrigeration system using $NH_3-CO_2$(R717-R744) is presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooling and superheating degree and condensing and evaporating temperature in the ammonia(R717) high temperature cycle and the carbon dioxide low temperature cycle. The COP of cascade refrigeration system increases with the increasing superheating degree, but decreases with the increasing subcooling degree. The COP of cascade refrigeration system increases with the increasing condensing temperature, but decreases with the increasing evaporating temperature. Therefore, superheating and subcoolng degree, evaporating and condensing temperature of cascade refrigeration system using $NH_3-CO_2$ have an effect on the COP of this system. A multilinear regression analysis was employed in terms of subcooling, superheating, evaporating, condensing, and cascade heat exchanger temperature difference in order to develop mathematical expressions for maximum COP and an optimum evaporating temperature.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.1
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• pp.32-38
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• 2009

In this paper, cycle performance analysis for cooling capacity, compression work and COP of R744($CO_2$) transcritical vapor compression refrigeration system is presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include superheating degree, outlet temperature of gas cooler and evaporating temperature in the R744 vapor compression cycle. The main results were summarized as follows : The cooling capacity of R744 increases with superheating degree, but decreases with the increasing evaporating temperature and outlet temperature of gas cooler. The compression work increases with superheating degree and cooling pressure of R744, but decreases with the increasing evaporating temperature. And, The COP increases with outlet temperature and evaporating temperature of R744 gas cooler, but decreases with the increasing superheating degree. Therefore, superheating degree, outlet temperature and evaporating temperature of R744 vapor compression refrigeration system have an effect on the cooling capacity, compression work and COP of this system. With a thorough grasp of these effect, it is necessary to design the compression refrigeration cycle using R744.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7736-7744
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• 2015

Considering the significant waste of industrial energy, effective use of low temperature waste heat is extremely important. In this study, a heat pump cycle with double effect and double stage was realized, which escalates the hot water temperature from $50^{\circ}C$ to $70^{\circ}C$ using $160^{\circ}C$ high temperature heat source and $17^{\circ}C$ low temperature heat source. The steam generated in the first generator condenses in the first condenser generating steam in the second generator. The steam condenses in the second condenser and is provided to the second evaporator. Part of the water out of the second evaporator is supplied to the first evaporator, which evaporates using low temperature waste heat. The evaporated steam enters the first absorber and the second evaporator. The steam out of the second evaporator is absorbed into the solution at the second absorber. The hot water temperature is raised in the second condenser and in the second absorber. Proper flow rates and UA values, which satisfied temperature lift $20^{\circ}C$ and COP 1.6, were deduced through trior and error. The COP increases as the temperature of the high temperature water increases, hot water temperature decreases and flow rate increases, waste water temperature and flow rate increases, solution circulation rate decreases. On the other hand, the temperature rise of the hot water increases as the temperature of the high temperature water increases, hot water temperature increases and flow rate decreases, waste water temperature and flow rate increases, solution circulation rate increases. In addition, the COP and hot water temperature rise increase as UAs of the heat exchangers increase.

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.97.2-97.2
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• 2005

• Journal of the Korean Society of Mechanical Technology
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• v.13 no.3
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• pp.81-85
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• 2011

The night time electric cost is cheaper due to electric supply and demand policy in Korea from 1985. Currently about 900,000 customers are using night time electric heating boilers and this causes shift of peak demand time to night in winter and increase of deficit spending. To solve this problem, replacing night time electric heating boiler by air-source heat pump using night time electricity has been proposed. An air-source heat pump can provide efficient heating equipment especially in a warm climate. For estimating the night time electric heat pump COP(Coefficient of Performance), Korean Standard KS C 9306:2010 and European Standard EN-14511:2004 is available. SCOP(Seasonal COP) using European weather bin data is also calculated. SCOP is not available yet but European Committee for Standardization will establish a standard in the near future. The evaluation result show that the replacing night time electric heating boiler by heat pump can be possible.

• Journal of Yeungnam Medical Science
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• v.2 no.1
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• pp.149-159
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• 1985

The authors studied Psychoticism, using SCL-90, in the subjects of 3,893 male college students and 1,976 female college students of Yeung Nam University, collecting data during the periods from October to November, 1984. The results could be summarized as follows: 1. There was significant difference in the mean averages of total psychoticism scores between male and female students; male students scored $6.81{\pm}5.13$ female students scored $8.14{\pm}5.05$. 2. Eighty eight male students (2.4%) showed seriously high psychoticism scores of 20 or higher, while 63 female students (3.2%) showed the same scores. 3. In a comparison between male students in different school grades, freshmen showed the highest level of psychoticism scores, and as the grades of students became higher, the levels of psychoticism scores were lower. 4. Among the psychosocial factors, there were strong tendencies toward higher psychoticism scores in the students who were dissatisfied with their college, and hsd pessimistic views of self image in the past, present or future, in both groups. 5. The male students whose educational fees were paid by their parents, and whose spending money per month was under 10,000won, showed higher level of psychoticism scores. 6. The female students whose maturation locations were city, who were dissatisfied with their departments, who resided in dormitory of other residencies, and whose educational fees were paid by their brothers or sisters, showed higher level of psychoticism scores. 7. The items relating to 5(Feeling lonely with people) 9 (Never feeling close to another) 10 (Idea something with mind) in psychoticism and the item of depressed affect in SDS were significantly correlated over 0.40 of correlation coefficient.

• The Korean Journal of Elementary Counseling
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• v.7 no.2
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• pp.117-129
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• 2008

The purpose of this study was to examine the Korean adolescents' perceptions of academic achievement process. The data from Korea Youth Panel Survey(KYPS) in 2003 and 2005 were analysed for this study. The sample consisted of 3,449 jounior-high school students and 3,125 high school students. Students reported the effects of class participation, private tutoring, and studying by oneself were almost same level. But the correlations of students' efforts and the academic achievement were different across the activities. Studying by oneself was regarded more effective by the students who took more efforts to participate at the class. And the correlation coefficient between the class participation and the academic achievement was highest.