• Proceedings of the Korean Statistical Society Conference
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• 2005.05a
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• pp.203-207
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• 2005

A loss system where two types of customers arrive in accordance with two independent Poisson processes is considered. An efficient recursive formula is developed for calculating the loss probability when the number of servers is large. Some practical examples regarding the performance evaluation of telecommunications networks are discussed.

• 대한예방의학회:학술대회논문집
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• 1994.02b
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• pp.265-269
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• 1994

A brief review is presented of the strengths and weaknesses of historical controls, data banks, and randomized trials in the evaluation of clinical treatment. Use of pre randomized versus postrandomized informed consent is discussed. Recommendations are made for the development of an appropriate clinical research strategy.

• Journal of the Korean Society of Clothing and Textiles
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• v.26 no.1
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• pp.83-94
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• 2002

This study was intended to identify fabric impact on decision-making process for clothing purchase, to determine evaluation factors of clothing, and to analyze consumer's preference for fabric on clothing purchase. 396 questionnaires distributed to college students were analyzed by descriptive statistics, oneway ANOVA, correlation, factor analysis and multidimensional scaling. The results are as follows; (1) Fabric impacted on the pre-purchase evaluation and the post-purchase process. (2) 4 factors - physical properties, outer-consciousness, self-satisfaction, and appropriateness- were determined as evaluation factors. Though fabric was included in the physical properties, fabric presented high correlations with other evaluative elements. (3) The most preferred fabric was being composed of natural fiber in fiber contents and having softness in sensation. As a result of multidimensional scaling, 2 dimensions of fabric sensation were developed as 'soft-hard'and 'thin-thick'.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.11a
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• pp.479-482
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• 2006

소프트웨어의 품질 특성은 크게 6가지로 나누어 평가되어지고 있다. 가능성, 신뢰성, 사용성, 효율성, 유지보수성, 이식성의 품질 특성중에서 신뢰성에 대한 평가가 상당히 중요하다는 인식을 받고 있다. 본 연구에서는 소프트웨어 신뢰성에 대한 평가 방법을 제시하고 소프트웨어를 시험하는 기관이나 소프트웨어 개발업체에서 작용할 수 있는 소프트웨어 신뢰성 평가 방법론에 대해서 연구하고 고장데이터를 적용하여 소프트웨어 신뢰성을 평가하는 평가 결과를 제시하였다.

• Journal of the Korean Data and Information Science Society
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• v.23 no.3
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• pp.457-465
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• 2012

The purpose of this study is to analyze the association between indicators and to find statistical models based on important indicators at 'College Notifier' in Korea Council for University Education. First, Pearson correlation coefficients are used to find statistically significant correlations. By variable selection method, the important indicators are selected and their coefficients are estimated. As variable selection method, backward and stepwise methods are employed.

• Communications for Statistical Applications and Methods
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• v.26 no.1
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• pp.1-9
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• 2019

Various probabilistic methods have been proposed for using interpopulation allele frequency differences to infer the ethnic group of a DNA specimen. The selection of the statistical method is critical because the accuracy of the statistical classification results vary. For the ancestry classification, we proposed a new ancestry evaluation method that estimate the combined ethnicity index as well as compared its performance with various classical classification methods using two real data sets. We selected 13 SNPs that are useful for the inference of ethnic origin. These single nucleotide polymorphisms (SNPs) were analyzed by restriction fragment mass polymorphism assay and followed by classification among ethnic groups. We genotyped 400 individuals from four ethnic groups (100 African-American, 100 Caucasian, 100 Korean, and 100 Mexican-American) for 13 SNPs and allele frequencies that differed among the four ethnic groups. Additionally, we applied our new method to HapMap SNP genotypes for 1,011 samples from 4 populations (African, European, East Asian, and Central-South Asian). Our proposed method yielded the highest accuracy among statistical classification methods. Our ethnic group classification system based on the analysis of ancestry informative SNP markers can provide a useful statistical tool to identify ethnic groups.

• International Journal of Internet, Broadcasting and Communication
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• v.13 no.1
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• pp.107-115
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• 2021

This paper presents a smartphone application for the clinical practice education conducted in hospitals, with an aim to evaluate its effectiveness. A nonequivalent control group posttest design was used, which included a total of 100 nursing of school students who conducted their clinical practice. They were divided into one control and one experimental group (50 students each). The control group was directly trained in the clinical practice orientation, and the experimental group was a group who self-learned the clinical practice orientation using a smartphone application. Research data were collected between March 5 and April 27, 2019. They were analyzed with descriptive statistics and independent t-test, using the SPSS Statistics Version 24. The smartphone application customized for the clinical practice education was implemented through the following four phases: analysis, design, development, and evaluation. The developed application was registered in Google Play (for Android apps) and Apple Store, and related information was provided, making it available for download. The study showed that the satisfaction with and self-confidence in learning differed significantly between the groups. However, technology acceptance and knowledge acquired through practice showed no statistically significant difference. The research results serve as basic data for applying smartphone applications as an educational method that can replace traditional modes of education, serving as a significant indicator of the education delivery method diversification.

• Journal of Engineering Education Research
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• v.19 no.3
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• pp.35-43
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• 2016

The purpose of this study is to explore directions for improvement of teaching at college of engineering based on analysis of differences from course evaluation of students and instructors. Data was collected from 86 instructors' ratings on courses and their 3004 students' ratings on courses at college of engineering in a two-year, a three-year college and a University from 2010 to 2013. The results of the survey indicate significant differences in the statistics from the several questions between the instructors and the students as well as between the course in a two-year, a three-year college and in a University. First, instructors' self evaluation of the course is higher than students' satisfaction ratings of the course on the average. Instructors' self evaluation are high on the questions 'The subject was proper for the course', 'The course provided the latest theory and trend of the field', and 'Fairness and objectivity about the exams and the assignments'. Also, the difference between Instructors and students on the questions is significant in the statistics. The professor must make sure that students know well how to organize the course content and the method for feedback to test result and homework. Second, instructors have higher satisfaction ratings on the six questions and students have higher satisfaction ratings on the one question('Make students participate in the class effectively') at a two-year and a three-year college. However, students have higher satisfaction ratings on the three questions('Make students participate in the class effectively', 'Concern about students' learning process', and 'Use of E-learning and media equipments') and instructors have higher satisfaction ratings on the one question. It means instructors at a University feel pressure on a teaching and they are unsatisfied with their teaching skills. Third, the result of comparing six parts of the questions shows that students' satisfaction ratings are higher on 'Students participation' and 'Application of media equipments' parts whereas instructors' self evaluation are higher on 'Exams and assignments' part. Fourth, the question 'Make students participate in the class effectively' is significant in statistic based on comparison of instructors and students, and comparison of in a college and a University. Students' satisfaction ratings are higher than instructors' self evaluation.

• Journal of the Korean housing association
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• v.22 no.5
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• pp.59-69
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• 2011

The purpose of the study was to perform the post-occupancy evaluation of housing environments of Jangyou New Town in Gimhae. The data for the analysis was collected through questionnaire survey method from August 10 to 27, 2010, and the sample consisted of 524 respondents living in apartment complexes in Jangyou. The features of housing environment were categorized into unit housing, apartment complex, and neighborhood and total 28 specific items were included in the evaluation. The data were analyzed using descriptive statistics and analysis of variance with Duncan's multiple range tests. The results were as follows: 1) Overall evaluation of housing environment of the residents in Jangyou were relatively high, expecially in floor plan layout of unit housing, self-expression through apartment complex, and natural environment of neighborhood. 2) The demographic and housing variables that had significant influences on the post-occupancy evaluation were age of the respondent, monthly income, apartment size and tenure type of apartment. Respondents who were over sixty years old, with monthly income of less than 2,000,000 won, or living in public rental apartments were more likely to evaluate overall housing environment positively than rest of the respondents.

• Journal of the Korean Society of Clothing and Textiles
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• v.38 no.4
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• pp.518-527
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• 2014

This study examined the effect of media involvement on appearance evaluation, appearance stress, and appearance management behavior. Data were collected from 315 female university students in Daejeon and Chungnam from May to June 2013. Data were analyzed by descriptive statistics, t-test, path analysis using the SPSS-WIN 20.0, AMOS 20.0 program. The results of this study were as follows. First, media involvement were classified into low and high groups. There were significant differences in appearance evaluation by level of involvement. The low group of media involvement indicated a more positive appearance evaluation than the high group. Second, there were significant differences in the appearance management behavior by level of involvement. Third, media involvement directly affected appearance evaluation and appearance management behavior. Appearance evaluation affected appearance stress and appearance management behavior. This study verified the structural relationship of media involvement, appearance stress, and appearance management behavior as outward behavior variables.