• Journal of the Korean Data and Information Science Society
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• v.19 no.4
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• pp.1327-1334
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• 2008

Mixed effect binomial regression models are widely used for analysis of correlated count data in which the response is the result of a series of one of two possible disjoint outcomes. In this paper, we consider kernel extensions with nonparametric fixed effects and parametric random effects. The estimation is through the penalized likelihood method based on kernel trick, and our focus is on the efficient computation and the effective hyperparameter selection. For the selection of hyperparameters, cross-validation techniques are employed. Examples illustrating usage and features of the proposed method are provided.

• Proceedings of the Korean Society for Quality Management Conference
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• 2006.04a
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• pp.493-495
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• 2006

People frequently discuss equipment behavior in terms of time(age) and usage(mileage). Common examples are automobiles in which time and usageare usually included in discussion of longevity. In this paper a structured examination of bivariate measures of equipment utilization is performed and some useful model forms are developed and evaluated.

• Proceedings of the Korean Society for Information Management Conference
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• 2015.08a
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• pp.77-82
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• 2015

본 연구는 의학 분야를 중심으로 A 대학교 의과대학 도서관의 Science Direct 전자학술지 이용통계와 Scopus 인용지수를 비교분석하였다. 이에 594종의 의학 분야 전자학술지를 추출하여, 그 이용통계와 Scopus 인용지수에 대해 빈도분석, 상관관계분석을 실시하였다. 그 결과 의학 분야 전자학술지의 이용이 소수의 학술지에 집중되어 있고, 그 이용통계와 인용지수 사이에 양의 상관관계가 성립함을 확인할 수 있었다.

• The Korean Journal of Applied Statistics
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• v.28 no.3
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• pp.417-427
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• 2015

Measures in response rate used to measure the representativeness of the sample (the more high response rate) better explain the representativeness of the sample. However, we cannot often explain the representativeness of the sample because there is nonresponse even in the high response rate. Therefore, Schouten et al. (2009) presented a new R-indicator measure that can be described as a representative of the sample. We research the new estimator of the R-indicator in this paper because there are parameters that require estimations. We describe the meanings as representative of the R-indicator; consequently, the bias and efficiency of the proposed estimator for R-indicator are compared to the existing estimator under various simulations. The representativeness of the sample is also explained by applying the proposed estimators in the actual data.

• Journal of the Korean Data and Information Science Society
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• v.24 no.6
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• pp.1177-1188
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• 2013

Modern society is changing rapidly toward the intellectual one. The needs of knowledge sharing are highly demanded for its growth and progress through the society at large. Even though university creates the knowledge in various fields, university members could not share the knowledge effectively for some reasons. This K university students case study reveals that usage of IT, college sponsoring and communicative culture affect educational performance indirectly as well as directly through knowledge sharing.

• The Korean Journal of Applied Statistics
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• v.26 no.1
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• pp.15-22
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• 2013

In clinical study or epidemic research, the $2{\times}2$ frequency table is useful to present a summary statistic The values of four cells in $2{\times}2$ table use to calculate the effect measures such as risk ratio, relative ris ratio or odds ratio. In this paper, we suggest that the improved visualization method using a radar diagram supported by MS-office Excel from the $2{\times}2$ frequency table is able to understand and draw easily betweendiagnosti measures such as sensitivity, specificity, predictivity, and likelihood ratio. We use some numerical example in order to show the usage of the proposed method.

• The Korean Journal of Applied Statistics
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• v.32 no.3
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• pp.405-421
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• 2019

Predicting how much energy to use is an important issue in society. However, it is more difficult to capture the usage characteristics of residential buildings than other buildings. This paper provides time series analysis methods for electricity consumption in a residential building. Temperature is closely related to electricity demand. An error correction model, which is a method of adjusting the error with time, is applied when a cointegration relation is established between variables. Therefore, we analyze data via ECMs with consideration of the temperature effect.

• Journal of Korean Library and Information Science Society
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• v.47 no.4
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• pp.167-190
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• 2016

This study aims to analyze the current status of e-book management and services in academic libraries and identify related issues in the provision of the services. To do that, it performed case studies with A and B university libraries. E-book usage statistics was collected from each library and interviews were conducted with librarians responsible for e-book management and services. The interviews included questions regarding obstacles to e-book management and services and current issues as well as budget and acquisition, access and catalogues, usage, and marketing for e-books. The results show that in both libraries, the usage of e-books is low compared with that of printed books and the usage of e-books has declined recently. This is because of lack of new books with shortage of budget. Also, the most important issue surrounding e-book services is academic library evaluation, enacted by Academic Library Promotion Act in 2015. This study discussed how the criteria for academic library evaluation influence the way the academic libraries acquire and manage e-books.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.38 no.4
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• pp.339-356
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• 2012

At this point in time, the importance of cosmeceuticals is being emphasized. This report is about the cosmeceuticals usage analysis of actual condition and purchasing behavior of female undergraduates. I suggest the methods for the sustainable improvement of cosmeceuticals that will satisfy needs of more customers through market segmentation. The subjects of this study were 340 undergraduates of selected 2 women's Universities in Seoul. 300 replies among the total distibuted questionnaires were analyzed with SPSS WIN 15.0 Statistics program. Through the study, it appears that the most female undergraduates use cosmeceuticals and the usage of cosmeceuticals is to resolve their skin problems. The most popular places for the purchase of cosmeceuticals are department stores and the most important consideration on purchases is the effectiveness of products. It is discovered that sunscreens are the most used cosmeceuticals.

• Journal of Korean Society of Rural Planning
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• v.11 no.3 s.28
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• pp.19-27
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• 2005

Rural Korea has been becoming heavily aged societies from the end of 20th century due to the massive depopulation of young generation and extension of the average span of human beings. Although rural communities in Korea had been traditionally based on closely webbed social relations, almost all of community self-help organizations disappeared in recent time with very strong urbanization trend. However, almost all rural villages in Korea have the village seniors' union -'NO-IN-HOE' in Korean speaking- of which members usually use, operate and maintain community facilities in terms of voluntary base. Using these facilities, most of public/common/private services and community activities have been being served or provided. So, the purpose of this study is to investigate the usage tendency of community facilities and needs of the rural elderly and to propose the improvement strategies for their optimum usage. For this purpose, data was gathered both from community (107 villages) and individual level surveys(881 older people). The statistical method used for data analysis was descriptive statistics. The major findings were as follows : It was found that the dominant family type of the rural elderly was elderly-only household (75%) with very limited economic capability. There are 2$\sim$3 common community facilities with village including the seniors' center -'KYOUNG-RO-DANG' in Korean speaking. Many of the elderly (74%) use the center once or twice per week. There are several rooms in the center, like as kitchen bathroom and health room, of which usage frequency differs respectively. Many rural elderly want assistance from out-of-village for good maintenance and free use of these facilities.