• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
• /
• v.27 no.4
• /
• pp.141-157
• /
• 2014

Objectives : The purpose of this study is to investigate the effects of DOGO phreatic water containing germanium on Atopic Dermatitis in NC/Nga mouse. Methods : We made DOGO phreatic water added germanium. After making atopic dermatitis caused by sensitizing NC/Nga mouse to DNCB(dinitrochlorobenzene), we made mouse swim in tanks each filled with distilled water, tap water, DOGO phreatic water, DOGO phreatic water(added germanium) for 30minutes everyday. 3weeks later, we analyzed skin clinical score, total IgE levels(by ELISA), WBC differential counting(Neutrophils, Monocytes), absolute cell number of $Neutrophil^+Gr-1^+$, CCR3 mRNA expressions(by Real-time PCR), IL-4, IFN-${\gamma}$ production levels(by ELISA), histologic test(by H&E staining, toluidine blue staining). Results : The results of making NC/Nga mouse induced atopic dermatitis swim in tanks filled with DOGO phreatic water(contain germanium) are as follows. 1. Skin clinical scores were decreased significantly in comparison to control group. 2. Total IgG levels were decreased significantly in comparison to control group. 3. WBC differential counting(Neutrophils, Monocytes) were decreased significantly in comparison to control group. 4. Absolute cell number of $Neutrophil^+Gr-1^+$ were decreased significantly in comparison to control group. 5. CCR3 mRNA expressions were decreased significantly in comparison to control group. 6. IL-4, IFN-${\gamma}$ production levels were decreased significantly in comparison to control group. 7. The epithelial tissue thickness, leucocytes infiltration, erythema, edema, excoriation, scaling, mast cells infiltrations in dorsal skin were decreased in comparison to control group. Conclusions : These results indicate that DOGO phreatic water(contain germanium) can be used for helping treat atopic dermatitis.

• Journal of Fisheries and Marine Sciences Education
• /
• v.3 no.2
• /
• pp.19-28
• /
• 1991

The United States has been developing a GPS(Global Positoning System), and now we can make use of it everywhere in the world. The author measured the usable time and took position fixes from three fixed stations in Japan in order to evaluate the positioning accuracy of GPS, firstly by the difference in the time of the year and, secondly by the difference in location between the stations in 1988. I was able to receive positioning signals from only 6 or 7 satellites, but in July 1991, 14 GPS satellites became available. The results obtained are summerized as follows: 1) The usable time was 7~9 hours from only 6~7 satellites. 2) In the case of the former, the time zone of position fixes varied with the time of the year and there were a little differences of the accuracy of position fixes except 3H(three dimensiomal high level positioning). In the case of the latter, there were not obvious locality differences in 3D(three dimensional positioning). But the positioning errors and number of data varied on each level in 2D(two dimensiomal positioning), although the positioning errors were smaller than 0.1 nautical mile. 3) Th standard deviations of Dep(departure) were larger than tat of D.lat(difference of latitude), and varied widely to the east and west. But the standard deviations were smaller than 100 meters.

• Korean Journal of Soil Science and Fertilizer
• /
• v.44 no.6
• /
• pp.1300-1305
• /
• 2011

The study was conducted to investigate the characteristics of flower quality and yield of gerbera 'Sunny Lemon' by mutrient solution strength and media of nutrient solution. The plant growth of 'Sunny Lemon' showed the highest values in the media of rockwool and perlite 1: peatmoss 2. Especially the yield of cut flowers for a year was more than 60 flowers and the flower longevity was over 10 days irrespective of nutrient solution concentration in the two media. There were no significant differences of plant characteristics in the nutrient concentration of 1/2 and 1 times, and the mineral nutrient contents showed similar values. Therefore, we recommended the media of perlite1: peatmoss2 with the concentration of 1/2 times for economical use. The rockwool media was not appropriate because of the weak buffer capacity like EC and pH.

• Korean Journal of Soil Science and Fertilizer
• /
• v.44 no.5
• /
• pp.944-958
• /
• 2011

Soil hydraulic properties such as hydraulic conductivity or water retention which are costly to measure can be indirectly generated by soil pedotransfer function (PTF) using easily obtainable soil data. The field soil structure description which is routinely recorded could also be used in PTF as an input to reduce the uncertainty. The purposes of this study were to use qualitative morphological soil structure descriptions and soil structural index into PTF and to evaluate their contribution in the prediction of soil hydraulic properties. We transformed categorical morphological descriptions of soil structure into quantitative values using categorical principal component analysis (CATPCA). This approach was tested with a large data set from the US National Pedon Characterization database with the aid of a categorical regression tree analysis. Six different PTFs were used to predict the saturated hydraulic conductivity and those results were averaged to quantify the uncertainty. Quantified morphological description was successively used in multiple linear regression approach to predict the averaged ensemble saturated conductivity. The selected stepwise regression model with only the transformed morphological variables and structural index as predictors predicted the $K_{sat}$ with $r^2$ = 0.48 (p = 0.018), indicating the feasibility of CATPCA approach. In a regression tree analysis, soil structure index and soil texture turned out to be important factors in the prediction of the hydraulic properties. Among structural descriptions size class turned out to be an important grouping parameter in the regression tree. Bulk density, clay content, W33 and structural index explained clusters selected by a two step clustering technique, implying the morphologically described soil structural features are closely related to soil physical as well as hydraulic properties. Although this study provided relatively new method which related soil structure description to soil structure index, the same approach should be tested using a datasets containing the actual measurement of hydraulic properties. More insight on the predictive power of soil structure index to estimate hydraulic properties would be achieved by considering measured the saturated hydraulic conductivity and the soil water retention.

• The Journal of Korean Institute of Information Technology
• /
• v.15 no.12
• /
• pp.181-188
• /
• 2017

As a population of leisure activities grows and diversifies, there is a great demand for portable and environment-friendly power generation systems. A small wind power generation system is emerging as a suitable power generation equipment to meet these needs. The most important thing when developing a small portable wind turbine is to reduce the weight of the generator and increase the efficiency. The existing 300W wind turbine generator weighs about 10kg, which is heavy to carry. Therefore, a new generator weighing less than 4kg to make it easy to carry with high efficiency has been developed. In addition, considering complicated characteristics of wind volume and topography of Korea, a small wind turbine that can be used in urban and rural areas individually was constructed. Through basic designing and optimization, the lightweight and efficient generator was manufactured. It is a 300W wind turbine designed and fabricated with reduced weight as a prototype. The average output voltage of the generator was 24.7V at 900rpm no-load test. On a load test with the average line voltage 36.8V and the average phase current 2.62A, when the mechanical input was 339.84W, an average voltage output of the generator was measured as 289.5W with efficiency of 85.18%. The generator weight was 3.84kg.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.27 no.6
• /
• pp.846-855
• /
• 2021

Eco-friendly and renewable energy sources are actively being researched in recent times, and of shore wind power generation requires advanced design technologies in terms of increasing the capacities of wind turbines and enlarging wind turbine installation vessels (WTIVs). The WTIV ensures that the hull is situated at a height that is not affected by waves. The most important part of the WTIV is the leg structure, which must respond dynamically according to the wave, current, and wind loads. In particular, the wave load is composed of irregular waves, and it is important to know the exact dynamic response. The dynamic response analysis uses a single degree of freedom (SDOF) method, which is a simplified approach, but it is limited owing to the consideration of random waves. Therefore, in industrial practice, the time-domain analysis of random waves is based on the multi degree of freedom (MDOF) method. Although the MDOF method provides high-precision results, its data convergence is sensitive and difficult to apply owing to design complexity. Therefore, a dynamic amplification factor (DAF) estimation formula is developed in this study to express the dynamic response characteristics of random waves through time-domain analysis based on different variables. It is confirmed that the calculation time can be shortened and accuracy enhanced compared to existing MDOF methods. The developed formula will be used in the initial design of WTIVs and similar structures.

• Journal of Family Resource Management and Policy Review
• /
• v.25 no.3
• /
• pp.17-30
• /
• 2021

The purpose of this study was to examine the effectiveness of family-friendly management in 501 family-friendly certified firms and to analyze organizational and social outcomes outlined by the firms. In addition, this study aimed to discover ways to promote family-friendly management by investigating the effects of ongoing support to certified firms, including family-friendly consulting and workplace training. The results showed that certified firms administer family-friendly workplace policies at a satisfactory level, while their management of policy indices and outcomes were not effective. The finding suggests that family-friendly management indices need to be aligned with firms' substantial outcomes. An improved organizational image and trust were major organizational outcomes of family-friendly management, and an enhanced CEO perception and a culture centered on gender-equality were significant social outcomes. These outcomes need to be promoted to attract organizations to engage in family-friendly management. The finding further implies the important roles of organizations in cultivating family-friendly environments in society. Finally, the certified firms with ongoing consulting and training support exhibited higher levels of family-friendly management and organizational and social outcomes. This study sheds light on the importance of long-term, systematic efforts by organizations in fostering family-friendly management and achieving organizational and social outcomes.

• Journal of Family Resource Management and Policy Review
• /
• v.25 no.2
• /
• pp.79-93
• /
• 2021

This study explored how the family-friendly culture of married employees is related to family strength and verified the mediating effects of work-life balance in such a relationship. The study included 213 married employees aged from their 20s to their 60s. Statistical analysis was performed using SPSS 18.0, and the Baron and Kenny (1986) method was used to perform descriptive statistics, difference verification, regression analysis, and mediation analysis. The results of the analysis were as follows. First, the differences between the general characteristics of married employees and family strength were analyzed. Among the general characteristics, married employees in their 60s were found to have a higher level of family strength compared with other married employees in their 40s-50s and 20s-30s. Furthermore, married employees with higher education (higher than college or graduate school education), with supporters, with a household income of more than 6.01 million KRW, and with positions higher than middle management were found to have higher levels of family strength compared with their counterparts in each case. Second, hierarchical regression was performed to analyze the factors affecting family strength; the younger the age, the higher the level of family-friendly culture and work-life balance, and the higher the level of family strength of married employees. Third, according to Baron and Kenny's(1986) mediation analysis, the balance between work and life had a partial mediating effect on the relationship between a family-friendly culture and family strength. Therefore, a family-friendly culture and work-life balance were verified to be important factors that can serve as alternatives for improving the family strength of married employees.

• Journal of Digital Convergence
• /
• v.17 no.7
• /
• pp.377-386
• /
• 2019

The purpose of this study is to identify effective strategies for promoting psycho-social adjustment by examining the mediating effects of self-esteem (SE) and moderating effects of social participation (SP) and discrimination experience (DE) in predicting social competence (SC) with acceptance of disability (AD). The subjects of the study were 1943 adults with a physical disability (1338 males and 605 females) and 233 adults with brain lesions (160 males and 73 females) aged between 19 and 65 years. Data were analyzed using SPSS and Process macro software, and conditional process analysis (model 18) in which the degree and onset of disability were controlled was performed. The results are as follows. First, SE was found to partially mediate the relationship between AD and SC. Second, the relationship between SE and SC was found to be moderated by SP but not by DE, and the relationship between SP and SC was found to be moderated by DE. In addition, the mediating effects of SE, which was moderated by SP, were found to not be moderated by DE. The clinical implication and suggestion for future research is discussed.

• Journal of Digital Convergence
• /
• v.16 no.12
• /
• pp.175-183
• /
• 2018

This study analyzes determinants of bond returns in terms of systematic risk versus idiosyncratic risk by examining relationship among those factors. First we examined the cross-sectional determinants of corporate bond returns with Korean bond market data from 2001 to 2014. This paper uses term factor and default factor for systematic risk, and duration factor and credit rating factor for idiosyncratic risk. The empirical result shows that systematic risk can explain cross-sectional differences of bond returns rather than idiosyncratic risk which is the same result in advanced markets(US or Europe). This result is different from the previous Korean studies which showed that idiosyncratic risk is more important than systematic risk in Korean bond market. The reason for the different result may be the longer sample period which includes the most recent period. It is insisted that Korean bond market is getting more synchronized with the advanced bond market. In conclusion, this empirical result implies that Korean bond portfolio managers should focus on systematic risk, which is contrary to current system in Korean asset management industry.