• Journal of health informatics and statistics
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• v.43 no.4
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• pp.255-266
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• 2018

Objectives: This study compared the risk of preterm birth and low birth weight between native-born and foreign-born women. Methods: By Using the birth registration data, every woman who gave birth between 2010 and 2016 in Korea was included in the analysis. Duration from marriage to pregnancy was measured by month and multiple socioeconomic and demographic characteristics were controlled. Preterm birth (<37 weeks) and low birth weight (<2.5 kg) were used for outcome variables. Descriptive statistics and logistic regression were used for data analysis with Stata. Results: The risks of preterm birth and low birth weight for native-born and foreign-born women differed according to the duration of marriage or birth order. For the first infant, foreign-born women were more likely to have pereterm birth or low birth weight than the native-born in the early stage of marriage but nativeborn women had higher risks than the foreign-born in the middle and later stage of marriage. For the second infant, foreign-born women were less likely to have pereterm birth or low birth weight than the native-born regardless of the duration of marriage. Conclusions: The results of this study demonstrates that the risk of preterm birth and low birth weight for foreign-born women is concentrated on the early stage of marriage. Institutional and cultural supports should be given to foreign-born women to help their early settlement in the Korean society.

• The Journal of the Korea Contents Association
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• v.12 no.4
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• pp.282-291
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• 2012

This study investigated the job satisfaction of care worker affect on service quality. It was intended to provide the basic information for enhancing the Job satisfaction and making better quality of service. In order to meet the above purpose, the questionnaire method was applied for the care workers who worked at the 16 home care facilities located in Busan metropolitan city. 250 sheets of questionnaire were distributed and the total of 216 sheets were sampled among the collected questionnaire and analyzed. For data analysis, the statistics package of SPSS/WIN 12.0 was employed to perform reliability test, descriptive statistics analysis, correlation analysis, regression analysis. And the obtained results are as follows: As the result of the regression analysis to find out how care worker's job satisfaction will affect towards the quality of the service, service quality increased as the care worker's job satisfaction rate was higher. For the job satisfaction's sub-variables, it showed high service quality as the satisfaction was increased in the order of task satisfaction level and job safety level.

• Journal of KIEE
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• v.11 no.1
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• pp.32-40
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• 2001

This paper presents the detailed statistics on radiation field signatures associated with multiple-intracloud lightning discharges. A transient signal recording system was used to measure the electric and magnetic fields produced by lightning flashes. The measurements were made in th summers of 1995 through 1999, and the location of the observation station was in Inchon on the coast of the Yellow Sea in Korea(37$^{\circ}$25'N, 126$^{\circ}$ 39'E). Most of lightning flashes typically contains between two and five strokes. The individual intracloud stork radiation fields were the bipolar pulse. On the average, the ratio of the peak of the second stroke to the first stroke peak was 75.1$\pm$40.1% for the negative, and a fraction of the subsequent stroke peaks were higher than the first stroke peak. The greater the number of the subsequent stroke order, less time separations between strokes were produced. The mean of the depth of the dip was 81.2$\pm$27.9% for the positive polarity and 75.9$\pm$24.4% for the negative. The depth of the dip increased for the positive bipolar pulses and decreased for the negative as the number of the stroke order increased.

• International Journal of Human Ecology
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• v.14 no.2
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• pp.53-68
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• 2013

The purpose of this study was to highlight the importance of 'marital preparation skill' by focusing on more substantial and tangible skills in marriage life, and to conduct an exploratory research to examine the current conditions and gender differences in marital preparation skills of college students. Data were gathered through a self-administered questionnaire in four universities located in Seoul and Gyeong-gi areas in the spring of 2013, and a total of 332 senior students chosen were used for data analysis. Based on the instrument used in Olson & Olson's(2000) PREPARE/ENRICH Program, the present study sought to suggest a measurement tool with the moniker of 'marital preparation skill' that included seven domains: conflict resolution skill, sexual relationship skill, household labor skill, financial management skill, leisure management skill, parenting preparation skill, and parental role skill. Each domain consisted of four items and thus, a total of 28 items were utilized for this study. Descriptive statistics were analyzed in order to examine the degree of marital preparation skills, and t-tests were conducted in order to assess the gender differences in marital preparation skills. The main results of this study are as follows: First, overall the degree of marital preparation skills of male students was higher than that of female students. Particularly, female students were lower than male students in the skills of financial management and conflict resolution. Second, regarding the basic household labor skill related to clothing and housing life, male students showed higher than female students, implying the impact of military life. Third, even though the degree of consciousness about appropriate preparation of parenthood and parental role seemed to be heightened, the actual degree of readiness of college students revealed to be insufficient. Male students had a much higher degree of confidence and sacrifice acceptance about parenthood, and understanding about their parents' child-rearing style than female students, while the mindset of child-rearing participation of male students was lower than that of female students. Findings of this study can be used as basic data for developing more effective and differentiated educational programs of marital preparation skills for men and women.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.106-106
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• 2015

The information of flow regimes continues to be norm in water resource and watershed management, in that stream flow regime is a crucial factor influencing water quality, geomorphology, and the community structure of stream biota. The objectives of this study were to estimate Korean stream flows from landscape variables, classify stream flow gages using hydraulic characteristics, and then apply these methods to ungaged biological monitoring sites for effective ecological assessment. Here I used a linear modeling approach (MLR, PCA, and PCR) to describe and predict seasonal flow statistics from landscape variables. MLR models were successfully built for a range of exceedance discharges and time frames (annual, January, May, July, and October), and these models explained a high degree of the observed variation with r squares ranging from 0.555 (Q95 in January) to 0.899 (Q05 in July). In validation testing, predicted and observed exceedance discharges were all significantly correlated (p<0.01) and for most models no significant difference was found between predicted and observed values (Paired samples T-test; p>0.05). I classified Korean stream flow regimes with respect to hydraulic and hydrologic regime into four categories: flashier and higher-powered (F-HP), flashier and lower-powered (F-LP), more stable and higher-powered (S-HP), and more stable and lower-powered (S-LP). These four categories of Korean streams were related to with the characteristics of environmental variables, such as catchment size, site slope, stream order, and land use patterns. I then applied the models at 684 ungaged biological sampling sites used in the National Aquatic Ecological Monitoring Program in order to classify them with respect to basic hydrologic characteristics and similarity to the government's array of hydrologic gauging stations. Flashier-lower powered sites appeared to be relatively over-represented and more stable-higher powered sites under-represented in the bioassessment data sets.

• Journal of Fisheries and Marine Sciences Education
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• v.27 no.5
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• pp.1364-1368
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• 2015

This study was performed to evaluate mineral contents of catfish Silurus asotus. As a result of mineral content, the mean content of the macro mineral was (in descending order): K (310.36-412.66 mg/100 g), P (186.42-223.02 mg/100 g), Na (35.32-57.87 mg/100 g), Mg (22.88-31.87 mg/100 g), Ca (9.05-13.07 mg/100 g). In comparison, the mean content of the micro mineral was (in descending order): Fe (0.26-0.95 mg/100 g), Zn (0.26-1.02 mg/100 g), Cu (ND-0.08 mg/100 g), Mn (0.01-0.03 mg/100 g). A proportion of mineral intakes with the dietary reference intakes for Koreans (KDRIs) set by the Korean Nutrition Society. Nutrient uptake proportion of mineral intakes was (in descending order): P (62.16%), K (20.71%), Mg (16.82%), Fe (13.02%), Zn (11.38%) Cu (10.94%), Na (6.59%), Ca (3.09%), Mn (0.96%). The mineral content was compared with the major protein food sources according to the Korea Health Statistics (2013) such as polished rice, pork, chicken, beef, eggs and milk. The calcium content contains; lower level of milk and eggs, chicken whereas higher levels of rice, pork and beef. Catfish has less iron content than major protein food source. Phosphorus and potassium contain higher level of major protein food sources.

• Korean Journal of Human Ecology
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• v.1 no.1
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• pp.69-77
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• 1992

The purpose of this study was to find out the relationships among the eating behavior, the nutrition knowledge & the physical growth, and factors influencing each of them in middle school students. Eight hundred three boys and girls, who were sampled from the third graders of 6 middle schools located in Taejeon and Ahnmyeondo, were asked to fill out the questionaire. The statistics used for data analysis were Frequency, Percentage, Oneway, Crosstabs, Chi-square($X^2$), t-test, Pearson Correlation, Regression, and Path analyses. The results are summarized as follows: I. The asked students showed the significant difference in frequency intaking food and the eating attitude depending on sexual distinction and area. The girls got higher frequency score(intaking food) than the boys did and the students in Taejeon got better eating attitude score than those in Ahnmyeondo. Also, the girls got higher nutrition knowledge score than the boys did and the students in Taejeon got higher nutrition knowledge than those in Ahnmyeondo. 2. The higher the economic level was, the higher the frequency score(intaking food) was. Also, the students whose father had the occupation involved in the tertiary industry and better school ing made higher nutrition knowledge, eating attitude, and frequency intaking food than others. The students whose father had the occupation involved in the tertiary industry and better schooling were taller and heavier than others. 3. The variables influencing on the frequency intaking food were father's school ing, father's occupation, economic level, sexual distinction, eating attitude. The variables influencing on eating attitude significantly was only the birth order. The variables influencing on the height were sexual distinction, residential area, eating attitude, frequency intaking food, father's schooling. Also, the variables affecting the weight were sexual distinction, father's schooling, eating attitude, frequency intaking food.

• Health Policy and Management
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• v.24 no.2
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• pp.128-135
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• 2014

Background: With ageing and growing importance of disease management system, it is necessary to investigate the extent of regional difference in service utilization for chronic diseases among the elderly and to reflect it in designing the system. Methods: A multiple regression analysis and descriptive statistics analyses were employed using patient survey, which covers nationwide health facilities and their users. Results: While the differences in the rate of service utilization/utilization outside living area between urban and rural areas or between income levels are not large, considerable variations are observed within urban or rural areas and within income groups. Conclusion: This results suggest that it is important to subsidize economically disadvantaged segments of the population and residents of less-favored areas to be better-equipped for chronic disease management in order to prevent the development of severe ailments and the need for treatment at higher-level medical institutions. Improvements to the service infrastructure in vulnerable regions are essential.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.11
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• pp.44-52
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• 1996

This paper proposes a KLT-CVQ scheme using PCNN to improbe the quality of the reconstructed images at a given bit rate. By using the PCNN and classified vector quantization, we exploit the high energy compaction and compelte decorrelation capbilities of the KLT, and the pdf (probability density function) shape and space-filling advantages of the vQ to improve the performance of the proposed hybrid coding technique. In order to preserve the preceptual fetures such as the edge components in the reconstructed images, we classified the input image blocks according to the texture energy measures of the local statistics and vector-coded them adaptively, and thereby reduces the possible edge degradation in the reconstructed images. The results of the computer simulations show that the performance of the proposed KLT-CVQ is higher than that of the KLT-CSQ or the DCT-CVQ in the quality of the reconstructed images at a given bit rate.

• Journal of Korean Society for Quality Management
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• v.36 no.2
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• pp.36-44
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• 2008

In this paper a novel feature extraction and selection is carried out in order to improve the discriminating capability between healthy and damaged structure using vibration signals. Although many feature extraction and selection algorithms have been proposed for vibration signals, most proposed approaches don't consider the discriminating ability of features since they are usually in unsupervised manner. We proposed a novel feature extraction and selection algorithm selecting few wavelet coefficients with higher class discriminating capability for damage detection and class visualization. We applied three class separability measures to evaluate the features, i.e. T test statistics, divergence, and Bhattacharyya distance. Experiments with vibration signals from truss structure demonstrate that class separabilities are significantly enhanced using our proposed algorithm compared to other two algorithms with original time-based features and Fourier-based ones.