• Journal of Korean Society of Environmental Engineers
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• v.34 no.10
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• pp.656-663
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• 2012

After the construction of waterworks automatic meter reading with 15 mm diameter digital water mater with magnetoresistance sensor developed in this study at 96 households of apartment complexes located in Incheon-City B-Gu S-Dong, the feasibility of field application of waterworks automatic meter reading was evaluated. The field application of waterworks automatic meter reading was performed from July to December in 2011, and average reception rate was as low as 84.6% due to the instable wibro networks, the existence of communication blackout and temporary malfunction of router. After the extraction of 10 households with one to five residents out of 96 households by using stratified random sampling method and analysis of domestic water use, it was found that domestic water use was significant at August and showed a decreasing trend at September, followed by increase in domestic water use at November and decrease in domestic water use at December. This phenomenon should be attributed to weather factors (temperature, humidity, etc.), which significantly affected domestic water use. Similar trend in domestic water use in terms of weather factors was obtained in case of Liter per capita day of water use after the extraction of 30 households out of 96 households by using stratified random sampling method. After analysis of Liter per capita day for 96 households, single residents increases resulted in reduction of domestic water usage by about 14% of Liter per capita day. These results might be due to the fact that domestic water usage such as laundry, beverages, catering, cleaning, etc. should be required for even the household with one resident, whereas domestic water usage for those common utilization can be significantly saved for the household with more than one resident.

• Journal of Fisheries and Marine Sciences Education
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• v.21 no.1
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• pp.78-95
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• 2009

The purpose of this study is to define areas and standards of kindergarten teacher's competency through survey research and interview with early childhood education community - kindergarten teachers, vice principals, principals, administrators, parents, and professors in early childhood education. Raw data from 62 interviewees were grouped into 25 codes including 'professional knowledge about young children's developmental characteristics, and labeled for representative themes. Based on the result of interview analysis, two areas of 'knowledge and skill' area (15 standards) and 'attitude and grounding' area (20 standards) were classified, survey researched for appropriateness and relative importance of each standard. 704 members of early childhood education community were collected through stratified sampling. The research findings indicate that 'observation and evaluation ability for young children' and 'affection for young children' showed high appropriateness in 'knowledge and skill area' and 'attitude and grounding area', respectively. In the relative importance analysis, 'understanding of young children's development', 'understanding of curriculum for young children', and 'understanding of young children's behavioral problem and counseling' for knowledge and skill area, and 'respect for young children', 'affection for young children', responsibility', 'positive attitude' for attitude and grounding area showed high relative importance in order.

• Journal of Families and Better Life
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• v.14 no.4
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• pp.71-84
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• 1996

The purposes of this study were to classify the family types based on the intra system dynamics and to examine sociodemographic backgrounds and the life satisfaction of these families. The data were collected by means of questionnaire distributed to a stratified sample of 544 housewives in Seoul who lived with housbands and children. The questionnaire included FACES II and III Communication Scale managerial behavior scale and life satisfaction Scale. Frequency percentile mean correlation factor analysis cluster analysis one-way ANOVA with scheffe test and chi-square test were used to analyze the data. This study had resulted in four major findings. The first was that highly positive relationships were found among four intra system dynamics elements. The first was that highly positive relationships were found among four intra system dynamics elements. The second finding was that families were clustered by four types named personal-oriented enervated dynamic and managerial-orien ed family. The third finding was that the four types of family were influenced by education level and job of husbands and family income. The last one was that the differences in life satisfaction were found among four types of family. The housewives of dynamic family type showed the highest level of satisfaction whereas the lowest level of life satisfaction was found among housewives of enervated family type. The recommendations for future esearch and better ways to educate and counsel families were suggested.

• Journal of Agricultural Extension & Community Development
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• v.12 no.2
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• pp.231-241
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• 2005

The objectives of this study were to explore leadership program participation of rural leaders and to analyze needs assessment for leadership program. The data were collected from 273 rural leaders by stratified random sampling. The SPSSWIN/ver.10 program was used for analyzing data with frequency and cross-tab analysis. The major findings of this study were as follows; 1) Rural leaders should effectively use leadership competency after leadership program. 2) Major problems of leadership program were lecturers' speciality and rather vague educational purpose. 3) Rural leaders wanted to learn more about rural and agricultural policies, conflict resolution among residents, specific and specialized leadership skills, and organizational activities. 4) Rural leaders responded that they need more programs on developing logical thinking, organizational competency, creative thinking, and positive attitude. 5) Characteristics of rural leaders should be considered in developing and implementing leadership programs.

• Journal of Sasang Constitutional Medicine
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• v.29 no.3
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• pp.242-247
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• 2017

Objective Korean medicine Data Center (KDC) has established large-scale biological and clinical data based on Korean medicine to demonstrate and validate its theory. The aim of this study was to develop KDC teaching dataset and user guideline to improve utilization of the KDC. Method KDC teaching dataset were selected using stratified random sampling according to the Sasang constitution (SC). This dataset included 72 variables of 500 sample subjects. The user guideline described how to conducted eight statistical analysis methods using the teaching dataset. Results The KDC teaching dataset was sampled from 200(40%) Taeeumin, 125(25%) Soeumin, and 175(35%) Soyanain. It was consisted of questionnaire (basic, habit, disease, symptom), physical exam (body measurement, blood pressure), blood exam, and expert' SC diagnosis. The usage guidelines provided instruction for users to perform several statistical analysis step by step with KDC teaching dataset. Conclusion We hope that our results will contribute to enhancing KDC utilization and understanding.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.149-151
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• 2006

This Study has the influence on the viewing determinative factors of pro-soccer sporting events base on viewing satisfaction. To attain the goal of the study described above paragraphs, some viewers of '06 season pro-soccer games held in Daejeon province was set as a collected group. Then, using the stratified cluster random sampling method, finally drew out and analyzed 388 people. The material collection device was the brochure named . To analyze materials, the regression analysis techniques. The conclusion based on above study method and the result of material analysis are here below. The pro-soccer sporting events viewing determinative factors influence on viewing satisfaction.

• Proceedings of the KSME Conference
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• 2001.06d
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• pp.110-114
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• 2001

A numerical analysis has been perfonned to estimate the effect of turbulent penetration and thermal stratified flow in the branch lines piping. This phenomenon of thermal stratification are usually observed in the piping lines of the safety related systems and may be identified as the source of fatigue in the piping system due to the thermal stress loading which are associated with plant operating modes. The turbulent penetration length reaches to $1^{st}$ valve in safety injection piping from reactor coolant system (RCS) at normal operation for nuclear power plant when a coolant does not leak out through valve. At the time, therefore, the thermal stratification does not appear in the piping between RCS piping and $1^{st}$ valve of safety injection piping. When a coolant leak out through the $1^{st}$ valve by any damage, however, the thermal stratification can occur in the safety injection piping. At that time, the maximum temperature difference of fluid between top and bottom in the piping is estimated about $50^{\circ}C$.

• Journal of the Korean Society for Library and Information Science
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• v.39 no.3
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• pp.245-261
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• 2005

The purpose of this study is to provide directions for more effective and efficient service for library user by evaluating and analyzing library service access points on university library homepages. 69 national/public and private university libraries throughout the country are selected by stratified sampling method. The items used for evaluation are composed of 4 areas and 23 questions, and SPSS 12.0 is used for statistical analysis. The results are elicited through the hypothesis testing, and some suggestions are made for the effective university library homepage service.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.33 no.4
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• pp.69-78
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• 2010

Multi-criteria ABC inventory classification is one of the most widely employed techniques for efficient inventory control, and it considers more than one criterion for categorizing inventory items into groups of different importance. Recently, Ramanathan (2006) proposed a weighted linear optimization (WLO) model for the problem of multi-criteria ABC inventory classification. The WLO model generates a set of criteria weights for each item and assigns a normalized score to each item for ABC analysis. Although the WLO model is considered to have many advantages, it has a limitation that many items can share the same optimal efficiency score. This limitation can hinder a precise classification of inventory items. To overcome this deficiency, we propose a context-dependent DEA based method for multi-criteria ABC inventory classification problems. In the proposed model, items are first stratified into several efficiency levels, and then the relative attractiveness of each item is measured with respect to less efficient ones. Based on this attractiveness measure, items can be further discriminated in terms of their importance. By a comparative study between the proposed model and the WLO model, we argue that the proposed model can provide a more reasonable and accurate classification of inventory items.

• Journal of the Korean Society of Costume
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• v.55 no.8 s.99
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• pp.30-47
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• 2005

The purposes of this study were to analyze the consciousness of the professors and college students about the fashion industry internship and to provide basis data which were to develop an internship program of the fashion company and university and to activate it. The whole country were classified as Seoul and Gyeonggi division, Gangwon division, Chungchung division, Yeongnam division, and Honam division for this study. As object of the questionnaire, the professors of 50 universities and 132 college students from every division were selected by stratified cluster sampling. The investigation tool for this study was composed of 95 items for two kinds of professor's and two kinds of college student's survey. The question results were analyzed by frequency analysis and variance analysis, t- test and f- test by spss 10.0. The contents of research result were as follows : First, it arranged the opinions of the college students and professors about the internship experience and execution reason, the internship application methods and execution contents, the type of preference company and worked company, the company education contents, internship evaluation and postmortem. It also proposed the roles of the academic world, fashion industry circles and government for the internship activation.