• Korean Journal of Agricultural and Forest Meteorology
• /
• v.7 no.2
• /
• pp.171-183
• /
• 2005

In order to monitor the global terrestrial carbon cycle, NASA (National Aeronautics and Space Administration) provides 8-day GPP images by use of satellite remote-sensing reflectance data from MODIS (Moderate Resolution Imaging Spectroradiometer) at l-km nadir spatial resolution since December, 1999. MODIS GPP algorithm adopts DAO (Data Assimilation Office) meteorological data to calculate daily GPP. By evaluating reliability of DAO data with respect to surface weather station data, we examined the effect of errors from DAO data on MODIS GPP estimation in the Korean Peninsula from 2001 to 2003. Our analyses showed that DAO data underestimated daily average temperature, daily minimum temperature, and daily vapor pressure deficity (VPD), but overestimated daily shortwave radiation during the study period. Each meteorological variable resulted in different spatial patterns of error distribution across the Korean Peninsula. In MODIS GPP estimation, DAO data resulted in overestimation of GPP by $25\%$ for all biome types but up to $40\%$ for forest biomes, the major biome type in the Korean Peninsula. MODIS GPP was more sensitive to errors in solar radiation and VPD than in temperatures. Our results indicate that more reliable gridded meteorological data than DAO data are necessary for satisfactory estimation of MODIS GPP in the Korean Peninsula.

• Journal of Biosystems Engineering
• /
• v.28 no.1
• /
• pp.19-26
• /
• 2003

An oscillating digger mechanism was designed, constructed. and tested. The mechanism is consisted of a six-bar linkage, one four-bar linkage was fer the digger blade and the other one fur variable soil-crop separation. Experimental variables were amplitude(3, 6, 9 mm). frequency(11.2, 14.9. 17.0 Hz), and forward speed of tractor(0.91, 1.13, 1.56 km/h). Each combination of these variables was replicated three times to measure the draft and torque for power requirement evaluation. and the broken-up soil height on the soil separation sieve mechanism. Four parameters λ(the ratio of vibration speed to forward velocity), p(the ratio of vibration acceleration to forward velocity), K(the ratio of vibration acceleration to gravitational acceleration), and T(the product of λ and K) were induced from three experimental variables: amplitude, frequency, and tractor speed. And the power requirement and soil separation ability were analyzed by regression. Though λ and K were known to be the representative parameters. T was the most moderate one to explain draft. torque. and soil separation in this study. It was estimated that the T equal to or greater than 2.4 was the minimum recommended value. Figure 18 would be useful fir the selection of amplitude. frequency, or operating tractor speed once any two variables are known.

• Journal of Environmental Impact Assessment
• /
• v.21 no.2
• /
• pp.265-277
• /
• 2012

This paper is primarily intended to present quantitative evidences for land surface albedo difference among seven metropolitan cites in South Korea. An empirical study for experimental sites was conducted to confirm how a standard MODerate Resolution Imaging Spectroradiometer (MODIS) instrument offers the viable method of measuring and comparing the regional heterogeneity of albedo among administrative districts. The metropolitan cities like Seoul located in dense building environment do result in much lower albedo than those exposed in much more sub-urban surface (e.g KwangJoo). These experimental results indicate that an urban surface such as building and road is a crucial explanatory variable for lower albedo. It is confirmed that the urban surface such as building and road could be employed as a proxy of the lower albedo burden in the metropolitan area. It is anticipated that this research output could be used as a valuable reference to confirm the potential of introducing the new concept of "administrative districts specific albedo management" to support more scientific and objective decision-making in the process of GHG (Greenhouse Gas) reduction project.

• Korea Journal of Hospital Management
• /
• v.16 no.2
• /
• pp.1-18
• /
• 2011

The research was to investigate the effect of quality cognition(usage, medical information, aesthetic, safety) of the web site of the facility on customer loyalty and moderating role of trust variable. The respondents was 201 patients and caregivers. Data were collected from March 1 to 31, 2010 at C university hospital in G city. In relationship between quality cognition of facility web site and customer loyalty, the results of quality cognition on customer loyalty showed 43.1% (F=36.912) in model 1, 46.3%(F=33.454) in model 2, and 46.8%(F=18.580) in model 3. In relationship between web site quality cognition and customer loyalty, moderate effect of trust was not considerable. As results, quality is the leading fact for customer loyalty more than trust. Therefore, customer loyalty leaves its possibility of increment when facility web site is designated depending on medical information, usage and aesthetic.

• Journal of Families and Better Life
• /
• v.22 no.6 s.72
• /
• pp.233-242
• /
• 2004

The main objective of this study is to provide baseline data and materials to be used for developing an manners education program. Such an educational program will help enhance the manners of university students. A stratified random sampling method was applied to collect data. Originally, 800 questionnaires were distributed to university students during the period between May 10 and May 31, 2m, and of the completed questionnaires, 7n3 were used for data analysis. 'The following findings were obtained:1. University students 'level of everyday manners was shown to be moderate, and the mean score was 6.76 (67.61/100 Points). 2. The level of demands for everyday manners education was shown to be high and the mean score was 8.05 (67.61/100 Points). 3. The variable that had the greatest impact on the level of everyday manners was the subjective knowledge about everyday manners, whereas gender affected the demand for education the most strongly.

• Journal of Families and Better Life
• /
• v.26 no.2
• /
• pp.33-41
• /
• 2008

The purpose of this study was to investigate the relationship between parent's conflict, paternal/ maternal grandmother's psychological support and school-aged children's well-being. The subjects were 227 6th grade school-aged children in elementary school who were 128(56.4%) boys and 99(43.6%) girls. Instruments used in this research were CDI(Children's Depression Inventory), CPIC(The children's perception of interparental conflict scale), and psychological support scale. The data were analyzed by simple regression, standard multiple regression and hierarchical multiple regression(using SPSS 12.1). Major findings were as follows: (1) There was no difference in maternal grandmother's psychological support and paternal grandmother's psychological support. (2) Maternal grandmother's psychological support was more important variable affecting school-aged children's well-being than paternal grandmother's psychological support. (3) Paternal/maternal grandmother's psychological support operated as a main effect with school-aged children's well-being increasing as paternal/maternal grandmother's psychological support increased. There were not interaction effects of parent's conflict and paternal/maternal grandmother's psychological support on school-aged children's well-being. That result showed that paternal/maternal grandmother's psychological support did not moderate negative effects of parent's conflict on school-aged children's well-being.

• Korean Journal of Human Ecology
• /
• v.8 no.3
• /
• pp.487-497
• /
• 1999

The purpose of this study was to investigate the relationship between the adjustment to life(school life, personal relations, home life, economic problem and time management), the clothing attitudes(status symbolism, fashionability, aesthetics, modesty, conformity, comfort aspect) and the clothing satisfaction. The questionnaires were administered to 456 university students in Chongju city to measure the demographic information, the adjustment to life and the clothing attitudes. As statistical analysis, frequencies, t-test, ANOVA, and correlation were used. The results were as follows: 1. The university students showed average state on the adjustment to their life. The adjustment to their home life and family was showed higher than other aspects, otherwise that to school life was showed lower than the others. 2. There were partially significant differences according to demographic variables of students on each aspect of the adjustment to life. 3. The university students showed moderate interest toward clothing attitudes. In the clothing attitudes, the interest toward comfort aspect was showed higher than other aspects, otherwise that toward conformity aspect was showed lower than the others. 4. There were partially significant differences according to demographic variables of students on each variable of the clothing attitudes. 5. There were partially significant correlations between each aspect of the adjustment and the clothing attitudes aspects.

• Korean Journal of Social Welfare
• /
• v.49
• /
• pp.319-342
• /
• 2002

The nuclear family is no longer the typical Korean Family. In recent years, stepfamilies have been of the most rapidly growing family forms in Korea. Census Bureau data show that 5.9% of marriage were in 1980, 8.0% in 1990, 10.3% in 1995, 18.0% in 2000. Especially it is remarkable that women's remarriage have been increased. In spite of the fact, the stepfamily is not an urgent issue of social welfare in Korea. The stepfamily is more vulnerable than the first-marriage family in many reasons such as vague family rules, boundary ambiguity, and stepparent role ambiguity, which provides rationale for social welfare services. This study categorizes determinants of psychological distress in remarried mothers into individual, family, and environment level and tries to prove the relationships between psychological distress and determinants. Also, it explores the degree of psychological distress in remarried mothers using Zung's Self-Rating Depression Scale. The respondents of survey research are 62 cases. The result shows relatively severe level of depression among the subjects. 46.8% of them are clinically diagnosed as mild, moderate, severe depression. Our findings suggest that the variables of marriage satisfaction, ex-wife's remarriage, role strains, marriage experience, and income are significantly associated with the level of psychological distress in remarried mothers. The most powerful predictor of psychological distress is the variable of marriage satisfaction. According to the result, it is desperately needed to pay attention to social welfare services or programs for stepfamilies.

• Journal of The Korean Astronomical Society
• /
• v.32 no.1
• /
• pp.7-16
• /
• 1999

Open clusters are useful tools to investigate the structure and evolution of the Galactic disk. We have started a long-term project to obtain UBVI CCD photometry of open clusters which were little studied before, using the Doyak 1.8 m telescope of Bohyunsan Optical Astronomy Observatory in Korea. The primary goals of this project are (1) to make a catalog of UBVI photometry of open clusters, (2) to make an atlas of open clusters, and (3) to survey and monitor variable stars in open clusters. Here we describe this project and report the first results based on preliminary analysis of the data on four open clusters in the survey sample: Be 14, Cr 74, Biu 9, and NGC 2355. Isochrone fitting of the color-magnitude diagrams of the clusters shows that all of them are intermediate age to old (0.3-1.6 Gyrs) open clusters with moderate metallicity.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.1215-1217
• /
• 2007

This paper is proposed a novel method to approximate the maximum power for a photovoltaic inverter system. It is designed for power systems application and utilities. The proposed Maximum Power Point Tracking(MPPT) control has the advantage to provide a new simple way to approximate the optimal or rated voltage, the optimal or rated current and maximum power rating produced by a solar panel and the photovoltaic inverter. And this straightforward method will be named linear reoriented coordinates method(LRCM) with the advantage that Pmax and $V_{op}$ can be approximated using the same variable as the dynamic model without using complicate approximations or Taylor series. This paper is proposed MPPT using LRMC method using weather condition of domestic moderate program technique. This paper is proposed the experimental results to verify the effectiveness of the new methods.