• 한국경영정보학회:학술대회논문집
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• 2007.06a
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• pp.970-973
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• 2007

정보보호의 중요성에 대한 인식은 매우 높아졌으나 정보보호에 대한 투자는 인식수준만큼 확대되지 않고 있다. 이는 정보보호 투자는 기업의 정보이용환경에 많은 변화를 가져오지만 투자효과에 대한 세부적 분석과 투자대상이 명확하지 않고, 그 효과를 측정하기 어려운 것이 주요원인이다. 본 연구에서는 기업과 조직에 적합한 정보보호 투자를 위한 선행 과제로 비용 및 효과요인을 분석하고자 한다. 이를 통해 기업에 적합한 정보보호 투자 대안을 선정하기 위한 연구모형을 제시한다. 기업의 정보보호 투자 의사결정시 계량화하기 어려운 기준들을 이용해서 합리적인 투자 대안을 선정하는데 활용될 수 있을 것이다.

• Proceedings of the Korea Society for Simulation Conference
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• 1998.10a
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• pp.62-64
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• 1998

유전 알고리즘은 전통적인 등반 알고리즘을 이용하여 구하기 어려웠던 최적화 문제를 해결하기 위한 강인한 (Robust) 탐색 기법이다. 특히 목적함수가 (1)여러 개의 국부 최대치를 가지거나 (2)수학적으로 표현이 불가능하거나 어렵거나 (3) 목적함수에 교란항이 섞여 있을 경우도 우수한 탐색 능력을 갖는 것으로 알려져 있다. 본 논문에서는 군집성 분석(cluster analysis)을 이용하여 군집화함으로써 유전 알고리즘을 이용하여 나타나는 다양한 해집합을 형성하는 개체군을 그룹화하고, 각 군집에 부여된 군집 적합도에 따라서 최적해를 구함으로써 최적값에 근접시킬 수 있는 탐색 알고리즘을 제안하였으며, 시뮬레이션의 출력이 특정한 테스트 함수의 형태로 나타난다고 가정한 경우에 확률적으로 나타나는 시뮬레이션 모델의 출력을 최대화하는 문제에 대하여 적용하고 분석하였다.

• Journal of the Korean Data Analysis Society
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• v.20 no.6
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• pp.2813-2827
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• 2018

Progressive censoring schemes have become quite popular in reliability study. Under progressive censored data, however, some units can be failed between two points of observation with exact times of failure of these units unobserved. For example, loss may arise in life-testing experiments when the failure times of some units were not observed due to mechanical or experimental difficulties. Therefore, multiply progressive censoring scheme was introduced. So, we derives a maximum likelihood estimator of the parameter of exponential distribution. And we introduced the goodness-of-fit test statistics using order statistic and Lorenz curve. We carried out Monte Carlo simulation to compare the proposed test statistics. In addition, real data set have been analysed. In Weibull and chi-squared distributions, the test statistics using Lorenz curve are more powerful than test statistics using order statistics.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2009.05a
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• pp.120-125
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• 2009

본 논문에서는 통계적 분류방법을 이용하여 문화재 자료의 분석을 수행하였다. 분류방법으로는 선형판별분석, 로지스틱회귀분석, 의사결정나무분석, 신경망분석, SVM분석을 사용하였다. 각각의 분류방법에 대한 개념 및 이론에 대해 간략히 소개하고, 실제자료 분석에서는 "지역별 문화재 통계분석 및 모형개발 연구 1차(2008)"에 사용된 자료 중 익산시 자료를 근거로 매장문화재에 대한 분류방법별 적합모형을 구축하였다. 구축된 모형과 모의실험의 결과를 통해 각각의 적합모형에 대한 비교를 수행하여 모형의 성능을 비교하였다. 분석에 사용된 도구로는 최근 가장 관심을 갖는 R-project를 사용하였다.

• Journal of The Korean Association of Information Education
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• v.23 no.6
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• pp.583-590
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• 2019

The purpose of this study is to develop an educational program for learning deep learning concepts for elementary school students. The model of education program was developed the deep-learning teaching method based on CT element-oriented teaching and learning model. The subject of the developed program is the artificial intelligence image recognition CNN algorithm, and we have developed 9 educational programs. We applied the program over two weeks to sixth graders. Expert validity analysis showed that the minimum CVR value was more than .56. The fitness level of learner level and the level of teacher guidance were less than .80, and the fitness of learning environment and media above .96 was high. The students' satisfaction analysis showed that students gave a positive evaluation of the average of 4.0 or higher on the understanding, benefit, interest, and learning materials of artificial intelligence learning.

• Journal of the Korean Data and Information Science Society
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• v.28 no.4
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• pp.733-742
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• 2017

There are many areas of applications where Gumbel distribution are employed such as environmental sciences, system reliability and hydrology. The goodness-of-fit test for Gumbel distribution is very important in environmental sciences, system reliability and hydrology data analysis. Therefore, we propose the two test statistics to test goodness-of-fit for the Gumbel distribution based on the generalized Lorenz curve. We compare the new test statistic with the Anderson - Darling test, Cramer - vonMises test, and modified Anderson - Darling test in terms of the power of the test through by Monte Carlo method. As a result, the new test statistics are more powerful than the other test statistics. Also, we propose new graphic method to goodness-of-fit test for the Gumbel distribution based on the generalized Lorenz curve.

• Journal of agriculture & life science
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• v.46 no.1
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• pp.43-51
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• 2012

This study was conducted to develop growth model and to estimate carbon storage of Quercus variablis stands. The study sites were located in the Yangpyeong and Gangneung regions. A total of 30 sample trees were harvested for data collection. According to the results of the application of Chapman-Richards model in this study, the coefficient of determination($R^2$) for the DBH-height model in Yangpyeong region was 97% while 94% in Gangneung regions. For the age-height relationship, the $R^2$ in Yangpyeong regions was 99% while 94% in Gangneung regions. The total carbon stored in Yangpyeong region was $83.0Mg\;C\;ha^{-1}$ while $137.3Mg\;C\;ha^{-1}$ in Gangneung.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.18 no.5
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• pp.19-33
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• 2019

There have been enormous efforts to develop an innovative public transport bus service for enhancing its operational efficiency based on Automated Vehicle(AV). However, since the vehicle operating environment in the public transport system varies with the purpose and method of mobility service, it is necessary to preferentially evaluate the current roadworthiness for an effective way to introduce the AV. Therefore, this study classified and redefined AV-based mobility service based on literature reviews. This research conducted the roadworthiness test for checking the feasibilities of the AV-based mobility services. Furthermore, we suggested some deployment strategies of the AV-based mobility service considering the Level-Of-Service (LOS) of road infrastructure based on the results of roadworthiness tests. The proposed direction would have a great potential to introduce the AV-based public transport system in the near future.

• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.923-931
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• 2009

The purpose of this study is to testify construct validity of Self-directed Learning Perception Inventory for middle school students(Lee, 2008). For the purpose, First, test was done with 1202 middle students sampled from nationwide. As a result of confirmatory factor analysis using structural equation model, we confirmed 7 factor model was generally appropriate and acceptable. Second, in order to test criterion-related validity, test was done with 530 middle school students sampled form Seoul, Gyeonggido, Chungchongdo. The inventory has criterion-related validity enough to be a tool for measurement. Reliability of this inventory was .94 and retest reliability was .91. The limitation of this and suggestion for future research were discussed.

• The Journal of the Korea Contents Association
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• v.17 no.7
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• pp.679-695
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• 2017

This paper analyzed the effect of job search channels on the occupational adaptation of college graduates, with the Graduates Occupational Mobility Survey(GOMS) data. The analysis results are as follows: First, when using human networks for getting jobs, not only the educational level and major adequacy, but also the workplace satisfaction and the job satisfaction were higher than when using non-human networks. Second, as in the mediating effect of the relationship between job search channels and occupational adaptation by Sobel-test, it was found that there was a partial mediating effect of educational level and major adequacy, excluding skill level adequacy. The results of this study shows that human networks, by serving as an effective information transmitter on person-job fit between job search and recruitment, contribute significantly to improve occupational adaptation of college graduates. These results imply that strategic utilization of human networks in job search activities is important, and that it is necessary that career-related programs in the universities or the employment service institutions systematically include the importance and methods of using human networks.