• Journal of The Korean Association of Information Education
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• v.11 no.4
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• pp.433-445
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• 2007

Digital divide comes to appear as a new factor of causing social inequality with the entry of information society. Especially, the digital divide in student class makes a worry about education inequality as the education using ICT, e-learning, and u-learning are enlarged. So, the concern about the status of digital divide in school is increasing. In this study, we conducted a questionnaire survey of students and teachers in elementary and secondary schools located in Gyeongnam, and measured informatization level with the weighted average of three subindices : accessing index, capability index, and utilization index. According to the survey, the index on information processing capability showed the largest gap in both the student group and the teacher group. We also had the result of positive correlation between the capability index and the utilization index. These results show that the gap of information processing capability is an important factor for understanding the digital divide.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.156-158
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• 2016

한국과 중국의 주요 연안항에 속하는 컨테이너터미널을 비교대상으로 선정하여 DEA와 Malmquist지수법어르 상대적 �류성 및 생산성 변동추이를 분석하여 터미널이 존재하는 문제점을 찾아내고 운영수준 제고에 필요한 시사점을 도출하고자 하였다.

• The Korean Journal of Financial Management
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• v.14 no.3
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• pp.289-318
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• 1997

본 논문에서는 1996년 5월 3일에 한국에서 주가지수선물거래가 시작된 이후 선물가격 형성이 적정하게 이루어지고 있는지를 검증하기 위하여 실제 선물가격과 이론가치를 비교하고 차익거래 기회와 만기간 스프레드거래 기회에 대한 실증분석을 실시하였다. 실증분석 결과 KOSPI 200 지수선물시장에서 선물가격은 이론가치에 비하여 지속적으로 저평가되는 현상을 나타냈으며, 증권거래소 회원사 뿐만이 아니라 비회원사에게도 선물매입/현물매도 차익거래 기회가 빈번하게 지속적으로 발생하였으며, 선물가격과 차익거래 밴드와의 괴리율 수준이 크게 나타났다. 두번째 근월물(원월물) 선물가격이 첫 번째 근월물(근월물) 선물가격에 비하여 지속적으로 저평가되는 현상을 나타냈으며, 거래소 회원사에게 원월물 매입/근윌물 매도 스프레드거래 기회가 존재하였으나 원월물 선물의 낮은 거래량을 고려하면 스프레드거래 기회는 제한적이었다고 할 수 있다. 그리고 분석기간을 네 기간으로 구분하여 조사한 결과 첫번째 기간부터 세번째 기간까지(1996.5-1997.4)는 선물가격의 저평가 현상이 지속적으로 나타나고 차익거래 기회도 빈번하게 발생하였으나 네번째 기간(1997.5-1997.8)에는 선물가격과 현물지수 사이의 가격불균형이 크게 축소되었고 차익거래 기회 빈도 및 괴리율 수준이 크게 감소되었다.

• Journal of Korean Society of Forest Science
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• v.110 no.4
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• pp.658-664
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• 2021

This study aimed to develop accurate status site index curves for C. japonica in Gyeongsang-do that reflect the regional characteristics. The development of high-growth models in Chapman-Richards, Schumacher, and Gompertz for 552 C. japonica growing in Gyeongsang-do. The Gompertz growth function is the most suitable for developing site index curves. The comparative test was analyzed using the F test at a significance level of 5% and the graph. As a result, compared with the national site index curves and site index curves under base age in Jeolla-do, the p-value was 0.05 or higher, and there was no statistically significant difference. The p-value was 0.05 or lower compared with site index curves over stand age in Jeolla-do, indicating a statistically significant difference. Therefore, it was determined that site index curves for C. japonica in Gyeongsang-do can be applied to the national site index curves and site index curves under base age in Jeolla-do, but not to site index curves over base age in Jeolla-do. Hence, based on the results of the study, it is possible to provide basic data on the forest management system for C. japonica in Gyeongsang-do and systematic and reasonable management through high field application reflecting regional characteristics.

• Journal of Korea Water Resources Association
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• v.47 no.5
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• pp.491-500
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• 2014

To estimate the severity of streamflow drought, this study introduced the concept of streamflow drought index based on threshold level method and Seomjingang Dam inflow was applied. Threshold levels used in this study are fixed, monthly and daily threshold, The $1^{st}{\sim}3^{rd}$ analysis results of annual drought, the severe hydrological droughts were occurred in 1984, 1988 and 1995 and the drought lasted for a long time. Annual compared to extreme values of total water deficit and duration, the drought occurred in 1984, 1988, 1995 and 2001 was serious level. In the results of study, because a fixed threshold level is not reflect seasonal variability, at least the threshold under seasonal level was required. Threshold levels determined by the monthly and daily were appropriate. The proposed methodology in this study can be used to forecast low-flow and determine reservoirs capacity.

• Electronics and Telecommunications Trends
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• v.14 no.3 s.57
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• pp.95-105
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• 1999

일반적으로 정보화 수준을 측정할 때 많이 사용되는 방법은 산술평균의 개념에 의한 대표값 산출방식이다. 그러나 이는 항목간의 통합문제의 관점에서 각 항목의 정보화 기여도가 무시되고, 급격한 정보화의 구조변화를 적절히 반영하지 못하며, 기본지표의 측정항목이 많아질 경우에는 해당 측정항목이 상대적으로 작은 기여도를 갖는 것으로 나타나는 등 여러 문제점을 내포하고 있다. 따라서 본 연구는 이와 같은 문제점을 해결하기 위하여 새로운 정보화 수준 측정방법을 제안하고 이에 따른 정보화지수의 측정.비교.분석을 통하여 새로운 측정방법을 검증하는 데에 있다. 본 고에서는 서로 상관된 국가정보화 지표들을 결합하여 하나의 가중치를 구하는 인자분석 및 대표성분점수화법 등 세 가지 방법을 이용하여 방법별로 정보화지수를 산출한 결과를 비교.분석하여 보았다. 세 가지 방법들에 의한 가중치 및 지수는 다소 값의 차이를 보이고 있지만 전체적인 추이는 같음을 보았다. 방법 1과 방법 2는 요인분석에 의한 분석 결과로서 가중치나 지수에서 다소의 차이를 보이고 있지만 유사성이 매우 크며, 방법 3에 의한 분석결과는 앞의 방법들과는 가중치 및 지수에서 차이를 보이고 있다. 특히 방법 3은 다른 측정 방법과는 달리 상관성이 높은 변수들에게 가중치를 부여하게 된다. 따라서 방법 1과 방법 2보다 더 객관적으로 각 지표의 가중치를 반영한다고 볼 수 있어 어느 정도 이 방법에 의한 분석이 유의함을 보여주었다.

• Fire Science and Engineering
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• v.23 no.3
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• pp.23-30
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• 2009

For managing fire safety system in building by ubiquitous management system, the index system to express the performance level of fire protection system is demanded. If some component formed fire protection system such as sprinkler water supply system is breakdown, that will fall down the performance of fire protection capacity. Consequently, it will affects the level of fire safety of building management and energy response. Consequently, Building fire protection system could give performance level of fire protection condition and the level of fire safety in building. It will also contribute to the development of wide area fire safety management. This development of index system has been developed as a part of the development project of Ubiquitous building fire management system.

• Journal of Cadastre & Land InformatiX
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• v.48 no.2
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• pp.197-211
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• 2018

We conducted this research to examine how well regional housing prices are suited to use as an alternative to conventional census-based regional deprivation indices in health and medical geography studies. To examine the relative performance of mean regional housing prices compared to conventional census-based regional deprivation indices, we compared several multilevel logistic regression models, where the first level was individuals and the second was health districts in the Seoul Metropolitan Area (SMA) in Korea, for the sake of adjusting the regional clustering tendency of unknown factors. In these models, we predicted two dichotomous variables that represented individuals' after-lunch tooth brushing behavior and use of dental floss by individual characteristics and regional indices. Then, we compared the relative predictive performance of the models using the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC). The results from the estimations showed that mean regional housing prices and census-based deprivation indices were correlated with the two types of dental health behavior in a statistical sense. The results also revealed that the model with mean regional housing prices showed smaller AIC and BIC compared with other models with conventional census-based deprivation indices. These results imply that it is possible for housing prices summarized using aerial units to be used as an alternative to conventional census-based deprivation indices when the census variables employed cannot properly reflect the characteristics of the aerial units.

• Journal of the Korean Society of Safety
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• v.29 no.6
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• pp.94-98
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• 2014

This study was intend to develop the optimal design method of suspension bridge by the reliability analysis based on minimization of life cycle cost(LCC). The reliability analysis was performed considering aleatory uncertainties included in the result of numerical analysis. The optimal design was estimated based on life-cycle cost analysis depending on the result of reliability analysis. As the effect of epistemic uncertainty, the safety index (beta), failure probability (pf) and minimum life cycle cost were random variables. The high-level distributions were generated, from which the critical percentile values were obtained for a conservative bridge design through sensitivity assessment.

• Science of Emotion and Sensibility
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• v.14 no.1
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• pp.83-92
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• 2011

Because of the development of digital technologies and information-oriented products, the importance of user interface design and usability are increasing in recent year. So we need a systematic and rational way to measure and manage how effective the improvement of user interface is. The purpose of this study is to develop measurable ‘Usability Improvement Index' which signify how much usability has improved in user interface design. First, I made the framework of measuring and evaluating usability through analysis of existing usability metrics and previous studies. Then, I suggested the process of calculating 'Usability Improvement Index' based on categorizing characteristics of measurable usability and definition of usability metrics. The process is as in the following : measuring the present level of usability, analysis of problems, making alternative user interface design, measuring the improved level of usability, calculating Usability Improvement Index. For verification, the case study on application of Usability Improvement Index to usability improvement of application software of digital camcorder presented. This study is expected to assist 'goal oriented user interface design' and to manage usability systematically.