• 대한산업공학회지
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• 제43권2호
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• pp.147-153
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• 2017

In order to demonstrate a target reliability with a specified confidence level, a new two-stage Bayesian Reliability Demonstration Test (RDT) plans that is known to be more effective than a corresponding single-stage one is proposed and developed by Bayesian framework with beta prior distribution for Weibull life time distribution. A numerical example is provided to illustrate the proposed RDT plans and compared with other non-Bayesian and Bayesian plans. Comparative results show that the proposed Bayesian two-stage plans have some merits in terms of required and expected testing time and probability of acceptance.

• 한국신뢰성학회지:신뢰성응용연구
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• 제17권2호
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• pp.129-135
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• 2017

Purpose: This article provides step-stress accelerated degradation test (ADT) plans based on the Wiener process. Method: Step-stress levels and the stress change times are determined based on the D-optimality criteria to develop test plans. Further, a simple grid search method is provided for obtaining the optimal test plan. Results: Based on the solution procedure, ADT plans which include the stress levels and change times are developed for conducting the reliability test. Conclusion: Optimal step-stress ADT plans are provided for the case where the number of measurements is small.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.612-617
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• 2005

Safety of railway systems is made by understanding causes and process of railway accidents and grasping contents of a many of accidents. Now, Being carried out a research and analysis about an extensive areas(the whole country, the metropolitan area, the five metropolitan cities, the city of three hundred thousands and over of people) and field, thereafter the National Transportation (Railway) Database has been constructed and developed to prepare the base that reduced an overlapping survey using a standardized-material offer. A purpose of this research is to derive plans to apply National transport DB including information in the field of transportation systems to domestic railway safety management. The research analyses the present conditions of establishing national transport DB, and reviews problems when that use to railway system. As being based in this, the research derived definitions and using plans of layers available to use, and plans of establishing and systematizing information for desirable railway network.

• Journal of the Korean Data and Information Science Society
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• 제17권3호
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• pp.945-952
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• 2006

Several accelerated life test plans use tests at only two levels of stress and thus, have practical limitations. They highly depend upon the assumption of a linear relationship between stress and time-to-failure and use only two extreme stresses that can cause irrelevant failure modes. Thus 3-level stress plans are preferable. When the lifetime distribution of test unit is exponential with mean lifetime $\theta_i$ at stress $x_i$, i=0, 1, 2, 3, we derive the optimum quadratic plan under the assumption that a quadratic relationship exists between stress and log(mean lifetime), and propose the compound linear plans, as an alternative to the optimum quadratic plan. The proposed compound linear plan is better than two other compromise plans for constant stress testing and nearly as good as the optimum quadratic plan, and has the advantage of simplicity.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.871-874
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• 1996

It is practically very important in multi-criteria long-tenn IRP process to develop the set of candidate resource plans that meet following two conditions. First, the number of resource plans should not be too large for computer job. Second, the unknown best plan should exist among the set of candidate plans. In this paper, several novel procedures are developed. The main idea of the procedures is the two-stage approach. The first stage is to find the set of feasible resource capacity mixes in given target year(s). And, the second stage is to find the set of alternative paths of resource options for each resource mix determined in the first stage.

• 보건의료산업학회지
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• 제12권2호
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• pp.135-147
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• 2018

Objectives : This study was to investigate the effect of socioeconomic factors of smokers on their smoking cessation plans, using Korean Welfare Panel data. Methods : Of the 16,664 subjects who responded to the 10th Korean Welfare Panel Survey, 2,246 respondents who answered that they were currently smoking were included in this study. Results : The variables that affected smoking cessation plans were female, low education level, low level of smoking per day, and more than 24 hours of smoking cessation experience. Conclusions : Expanding the smoking cessation program for women, preventing smoking in schools and providing smoking cessation education will likely have a positive effect on smoking cessation plans. In addition, it would be helpful to increase the amount of smoking cessation support aimed at reducing the amount of cigarettes smoked per day and continuing smoking cessation for more than 24 hours.

• 환경영향평가
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• 제24권3호
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• pp.244-259
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• 2015

환경영향평가법 개정으로 전략환경영향평가가 도입되어 대상계획을 15개 정책계획과 86개 개발기본계획 체계로 개편하여 시행하였지만 최근 평가 대상계획의 확대에 대한 논의가 국가 환경영향평가 정책의 중요한 이슈이다. 이에 본 연구에서는 각국의 법령이나 지침에 제시된 전략환경평가 대상계획을 비교하여 대상계획에 포함되어야 하는 계획들을 제안하고자 한다. 총 10개국의 전략환경평가 대상계획을 조사하였으며, 대상계획이 법령이나 지침에 명시되어 있는 독일, 프랑스, 이탈리아, 영국 및 네덜란드의 사례들을 우리나라 전략환경영향평가 대상계획과 비교하였다. 본 연구를 통해 다수 국가의 연방수준 계획에 포함되어 있으며 환경에 상당한 영향을 미칠 것으로 예상되는 도시계획 분야와 에너지계획 분야의 상위계획 중 광역도시계획, 도시 군 기본계획, 에너지기본계획, 전력수급기본계획들을 전략환경영향평가 대상계획에 포함할 것을 제안하였다.

• 한국산림과학회지
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• 제106권3호
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• pp.330-339
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• 2017

우리나라는 공 사유림에 대해서 광역시 도가 지역산림계획을 수립하여 산림을 경영하도록 하고 있으며 지역산림 계획은 국가 단위의 산림기본계획과 임분 단위로 수립되는 산림경영계획을 연결하는 고리로서 매우 중요하다. 따라서 지역산림계획을 보다 효율적으로 작성하는데 필요한 지역단위 산림자원에 대한 분석이 요구된다. 본 연구에서는 광역시 도 단위로 어느 수종이 집중되어 있는지 제시하여 지역산림계획의 효율적 수립에 기여하고자 하였다. 집중도 분석을 위한 방법으로는 특화계수와 상대집중계수를 사용하였으며 이를 면적과 재적 자료를 통하여 각각 산정하였다. 그 결과 각 시 도별로 집중되어져 있는 임업통계연보에서 제시된 주요 수종들을 순위 별로 제시하였다. 연구의 결과는 지역산림계획 수립 시 해당 지역에 집중된 수종을 고려하여 목표수종 혹은 경영방향을 수립하는데 기여할 수 있을 것이다. 면적과 재적 기준의 결과 차이에 대한 추가적인 연구를 통해 차후 지역의 수종별 생산성 요소도 반영할 수 있으리라 사료된다.

• 한국농촌건축학회논문집
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• 제20권1호
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• pp.61-68
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• 2018

This study aims to investigate the changes in area ratios by space through floor plans of national leasing houses constructed by the LH in Jangseong-gun, particularly focusing on the floor plans of public leasing housing complexes built during the 1970s-80s and those during the 2010s. The results are as follows: First, according to the composition ratio of floor plans by period, the type of Bedroom> Livingroom> Common Area> Kitchen+Dining> Multi-purpose room> Bathroom> or the type of Bedroom> Livingroom> Kitchen/Dining> Common Area> Bathroom> Multi-purpose room were found to be high during the 1970s. Whereas, the type of Common Area>Living room(Kitchen/Dining included)>Bedroom>Bathroom>Front Entrance was found to be high during the 2010. It can be concluded that the ratio of Bedroom and Living room was found to be high during the 1970s, but after 2010s, the spacial composition ratio of Common Space, Living room, and Bedroom is getting higher in the order. Second, in terms of the composition ratio of floor plans by the area of unit household, among the floor plan of C-1, B-2, B-3, C-2 which were used since 2010s, the spatial ratio of Bedroom was maintained in the range of 20%; while during the 1970s, the Bedroom space of A-1(46%), A-2(46%), and A-3(41%) was found to be higher than 40%. It can be concluded that the size of bedroom space has doubled over time. In terms of the changes in the spatial ratio of Living room, A-1(15%), A-2(22%), and A-3(23%) were found during the 1970s. Compared to the recent floor plans of C-1(28%), B-2(25%), B-3(33%), and C-2(34%) which are applied in Jangseong-gun, Jeollanam-do province, no big changes have been found, particularly in the small floor plans (20% range).

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제3권12호
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• pp.537-546
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• 2014

본 논문에서는 사용자 및 전문가 평점에 기반하여 여행계획을 자동으로 생성하여 여행에 앞서 효율적인 스토리텔링 여행을 체험할 수 있도록 지원하는 연구를 진행하였다. 효율적인 여행계획의 자동생성을 위하여, 입력된 전문가 평점 및 사용자들의 평점들을 토대로 우선순위를 바꿔 나타낼 수 있도록 하였으며, 점진적 계층 방식을 이용하여 생성된 스토리텔링 기반의 추천코스를 통합하여 전체 여행계획 생성이 가능하도록 하였다. 이렇게 생성된 여행계획은 일반 동영상 및 파노라마 동영상을 통하여 실제 위치를 체험해 볼 수 있도록 하여 사용자들에게 여행지에 대한 기대감을 높일 수 있도록 하였다. 또한, 휴리스틱 기법을 이용하여 시스템의 사용이 많아질수록 보다 효율적인 여행계획 생성이 이루어질 수 있도록 하였다. 연구된 내용은 안드로이드 운영체제 환경에서 구현 및 테스트하여 새로운 방식의 여행계획 자동생성에 효율성을 입증하였다. 본 연구에서는 파노라마 동영상을 통한 체험 방식의 도입과 사용자 평점 기반의 효율적인 여행계획의 자동구성방법을 제시하여, 내 외국인의 여행계획 구성에 대한 활용뿐만 아니라 궁극적으로 관광활성화에도 기여할 수 있을 것이라 기대된다.