• Journal of Families and Better Life
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• v.27 no.2
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• pp.63-75
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• 2009

The purpose of this study was to analyze university students' attitudes toward hair care as well as their hair care practices and spending. The analytical tools include the chi-square test, t-test, one-way ANOVA, Pearson's correlation analysis and multiple regression analysis. The major findings were as follows: (1) The mean of university students' attitudes toward hair care was 18.5(out of a possible 30). (2) The variables that significantly influenced students' attitudes toward hair care were gender, school year and monthly spending money. (3) Hair care practices differed according to demographic variables and attitudes toward hair care. (4) The average monthly expenditure on hair care was 31,769 won. The variable that most influenced monthly hair care expenditures was gender. In sum, this study found that the variable with the largest effect on hair care attitudes, practices and spending was gender.

• Proceedings of the KIEE Conference
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• 2009.04a
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• pp.46-48
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• 2009

This paper aims to investigate generation conditions necessary for the most efficient generation by measuring electricity power under various irradiation conditions, since the photovoltaic generation system has high costs and low efficiency. In addition, because the irradiation varies hourly, daily, monthly, and yearly, the research on the irradiation necessary for photovoltaic generation was carried out by analyzing the pattern o( Bower under various irradiation conditions. Also, after measuring the daily variations of irradiation and generation power, the monthly accumulated irradiation and monthly accumulate power which had the most generation power were investigated and the pattern of the annual generation power was analyzed. The results of this study are as follows. As for the relationship between the photovoltaic generation system and the irradiation, the generation power increased with the irradiation and when the irradiation was more than 600 $[W/m^2]$ the generation power amounted to more than 100 [Wh] as the resonable result.

• Journal of the Korea Fashion and Costume Design Association
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• v.2 no.1
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• pp.51-74
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• 2000

The purposes of the study were to investigate the differences of female students' clothing selection criteria and their life styles according to their demographic data and to examine the differences of their clothing selection criteria according to their life styles. The data were collected from 400 female college students in Chungju city through self-administerd questionnaires, and were analyzed by frequencies, Cronbach' s α, F­test, Factor Analysis, Cluster Analysis, one way ANOVA and Duncan Test. The results of the study were as follows: There were significant differences between variables of clothing selection criteria according to student's major, father's education level, family's monthly income, student's monthly expenditure on clothing and her companion when purchasing her clothing. Life styles were classified five types. The dimensions of life style were significantly different according to student's major and monthly expenditure on clothing. There were significantly different between life style dimensions and clothing selection criteria.

• Korean Journal of Rural Living Science
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• v.10 no.2
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• pp.15-27
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• 1999

The purposes of this study were : 1) to investigate the differences of female students' clothing behaviors and their life styles according to their demographic data, 2) to examine the differences of their clothing behaviors according to their life styles. The data were collected from 440 female college students in Chungju city through self-administered questionnaires, and were analyzed by frequencies, Cronbach's alpha, t-test, factor analysis, cluster analysis, one way ANOVA and Sheffe test. The results of the study were as follows : Four variables of clothing behavior were significantly different according to father's occupation, father's monthly income, student's major, student's monthly expenditure on clothing and her companion when purchasing her clothing. Life styles were classified five types. The dimensions of life styles were significantly different according to student's major and monthly expenditure on clothing. There were highly significant differences between life style dimensions and clothing behavior variables.

• Korean Journal of Agricultural Science
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• v.38 no.3
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• pp.571-581
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• 2011

This study develops a mid-term preceding observation model of radish to complement an existing short-term agricultural observation model. The first purpose of the study is to extend a three seasonal classification(spring, summer, fall) of fruit-vegetables to a four seasonal classification that involves the winter additionally. This allows us to verify the reason for demand and supply unbalance and unstable price of radish. The second purpose is to construct a mid-term preceding observation model that would be used to forecast planted areas, output, monthly shipment and price. To achieve these purposes, several multiple regression models are estimated. A system is consisted of a planted areas equation, a yield equation, monthly shipment distribution equation, and monthly price equation. To calculate output an auxiliary equation is involved in the system and the consumer price index etc are considered as exogenous variables.

• Proceedings of the KSR Conference
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• 2000.11a
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• pp.86-92
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• 2000

The crew operation scheduling problem is divided into duty generation and duty allocation. The railway crew roster scheduling(duty allocation) is developed monthly for each crew's office, considering the car types and crew's driving ability. However, it is very difficult to make schedules which assign monthly working hours to each crew evenly. The purpose of this thesis is to minimize the differences between each crew's total duty times and make a rostering table. To minimize the differences among monthly working hours of each crews are grouped according to car type and crew's driving ability and a rostering table which could be shared by the group members is developed. Our approach is to apply the techniques of Constraint Programming in order to solve such problems efficiently. This algorithm is suitable to solve optimization problems which involve many complicated constraints. And including the concept of cost, we suggested the model which enable to make the rostering table with a minimum personnel.

• Journal of Families and Better Life
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• v.16 no.4
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• pp.183-196
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• 1998

The purpose of this study was to investigate the discretionary consumption expenditure of Korean urban housewives and the factors contributing to the discretionary consumption expenditure. 535 housewives living in Seoul and Gyungki district were selected and frequencies percentile means standard deviation and multiple-regression analysis were utilized. The results of this study were as follows: First the monthly discretionary consumption expenditure of Korean urban housewives was 592,500won. Particularly the level of clothing expenditure for urban housewives of 135,700won was found to be the highest expenditure among other discretionary expenditures while the level of transportation expenditure of 68,100won was found to be the lowest expenditure. Second educational attainment employment status conspicuous tendency of consumption and contribution to household economic of urban housewives husband's job the number of children monthly income debt ownership and home ownership were ignificant variables on each category of discretionary consumption expenditure while age future economic expectation egion and total asset were not significant variables. Third employment status conspicuous tendency of consumption husband's job the number of children monthly income and debt ownership were related to discretionary consumption expenditure of Korean urban housewives.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.411-412
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• 2014

The objective of this study was to evaluate relationships between the economic status and the oral health status. Data were obtained from the National Health Insurance Corporation database. The prevalence of dental caries and tooth loss were compared among the ten-percentile according to the level of the monthly income. The prevalence of dental caries and tooth loss were lower in the high level of monthly income than low level of monthly income group. There was a significant relationships between the economic status and the oral health status.

• Journal of Korean Society on Water Environment
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• v.20 no.4
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• pp.352-356
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• 2004

Variations of water quality parameters were investigated for last 13 years in Han river. Deviation from 3 month moving average was suggested for the variation analysis. Many parameters of mainstream and tributaries showed similar monthly fluctuations. Suspended solid of mainstream showed higher fluctuation than that of tributaries due to summer flood. Contrarily, the organic parameters such as BOD, COD, and TN showed lower fluctuations in the mainstreams. The magnitude of deviation was in the order of pH < DO, COD, temp. < BOD, TN < TP, SS. Strong correlation was found in BOD data of adjacent sites. Main sites showed low deviation in comparison to adjacent common sites of mainstream (1:2.4). Mainstream showed low deviation in comparison to tributaries (1:1.7). Seasonal tendency of monthly BOD was confirmed using autocorrelation function. The deviation was in inverse proportion to the magnitude of BOD.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.47 no.2
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• pp.108-117
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• 2011

In order to offer data about fisheries resources management and prediction of catch on large purse seine fisheries, the fluctuation of the fisheries condition and distributions of fishing ground for mackerel were analysed with monthly catch data for 1990.2009. The overall catch has decreased to about 70% since 1997, with approximately 70% of the mackerel (Scomber japonicus) catch and monthly fluctuations showing a similar pattern. Monthly distribution of fishing ground is like distribution of mackerel in large purse seine fishery. The main fishing grounds are near Jeju Island and the Yellow sea with the main fishing season existing between October to December. The catches fluctuations and distribution of fishing ground were related to the effect of regime shifts. Therefore, in order to prediction of catch on large purse seine fisheries should be studied these relationships.