• 한국태양에너지학회 논문집
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• 제31권5호
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• pp.134-139
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• 2011

Since large and small scale photovoltaic(PV) systems have been commercialized in many countries, it is necessary to assess the effects of PV systems on the electric power system. For this, the development of accurate simulation model of PV arrays is very important. PSCAD/EMTDC, a widely used simulation tool for analyzing the transient behavior of electrical apparatus and networks, does not have a standard model of a PV array. Therefore in order to simulate the PV array, users have to develop their own simulation model. However, the block-diagram-based model is very complicated, and it is hard to modify the model parameters. In this study, we develop the user-defined model of a PV array by using the Design Editor, which is provided by PSCAD program. The mathematical model of a PV array and the method to determine the parameters of nonlinear I-V equation are implemented in a Fortran code. The graphical user interface provides the users with easy and simple way to modify the PV array parameters and simulation conditions. In order to help the users, this model also provides the parameters of 10 commercial PV arrays.

• 컴퓨터교육학회논문지
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• 제19권1호
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• pp.41-51
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• 2016

교육과정은 해당 교과 뿐 아니라 사회적인 필요에 의해 구성되는 것으로 충분한 숙의를 요구한다. 정보과 교육과정 표준 개발은 수시 개정 시 지식의 틀을 제공할 수 있을 것이기 때문에 매우 의미있는 작업이 될 것이다. 이에 본 연구는 Tyler의 교육과정 개발 원리에 근거하여 CSTA의 2003, 2011 교육과정을 비교하여, 한국 정보과 교육과정 지식 체계 표준 개발에 시사점을 제공하기 위한 목적이 있다. 목적달성을 위해 다양한 교육과정 이론, 외국의 교육과정 등을 분석하고, 최종적으로 CSTA 2003과 2011 교육과정 표준을 분석하였다. 분석 결과, 교과의 표준을 개발하기 위해서는 교육과정 목적과 표준이 갖는 목적을 분명히 할 필요가 있음을 제시하였다. 또한 외국의 교육과정 검토의 유의사항 및 평가 측면의 시사점을 제공하였다.

• 한국안전학회지
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• 제30권4호
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• pp.174-180
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• 2015

This study developed a Safety Culture Impact Assessment Model (SCIAM) which consists of a safety culture assessment methodology and a safety culture impact quantification methodology. The SCIAM uses safety culture impact index (SCII) to monitor the status of safety culture of the NPPs periodically and it uses relative core damage frequency (RCDF) to present the impact of safety culture on the safety of the NPPs. As a result of applying SCIAM to the reference plant (Kori 3), the standard for the healthy safety culture of the reference plant is suggested. SCIAM might contribute to improve the safety of the NPPs (Nuclear Power Plants) by monitoring the status of safety culture periodically and presenting the standard of healthy safety culture.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.749-756
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• 2006

Because of the orthotropic elastic properties and significant two-way bending action, orthotropic plate theory may be suitable for describing the behavior of concrete filled grid bridge decks. Current AASHTO LRFD Bridge Design Specification(2004) has live load moment equations considering flexural rigidity ratio between longitudinal and transverse direction, but the Korea highway bridge design specification(2005) doesn't. The Korea highway bridge standard specification LRFD(1996) considers an orthotropic plate model with a single load to estimate live load moments in concrete filled grid bridge decks, which may not be conservative. This paper presents live load moment equations for truck and passenger car, based on orthotropic plate theory. The equations of truck model use multiple presence factor, impact factor, design truck and design tandem of the Korea highway bridge standard specification LRFD(1996). The estimated moments are verified through finite-element analyses.

• 한국환경과학회지
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• 제8권1호
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• pp.135-144
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• 1999

Air quality modeling about coastal urban region such as Pusan shoud be consider shipping source emmited from ships anchoraging and running. It has been proved at our previous studies that the ratios of air pollutants emission amount in coastal area to inland are 12.2% for NO$_2$ and 11.7% for $SO_2$ and the air qualify of coastal urban area consierably counts on ships. Also the dispersion pattern of the all pollutants followed local circulation system in this region. Therefore this study has been developed air quality model which can describe the formation, transport, transformation and deposition processes of air pollutants considering shipping source. Currently, restriction for emission amount of ships does not exist, so our study will be useful to set the omission standard and for devising air quality policy in coastal urban region.

• 대한안전경영과학회지
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• 제19권4호
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• pp.221-230
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• 2017

Recently, service quality must reflect several demands of customers who show rapid and various changes so as to be compared with the past. So, objective and rapid methods for them are necessary more. For them, first of all, service company must calculate their standard of service quality accurately by measuring service quality exactly. To measure service quality accurately, this researcher collected and analyzed data by survey for customers who are customers of logistics services, grasped potential satisfaction standard(P) by 5 point Likert scale and one survey for accurate classification of quality attributes through weighted customer satisfaction coefficient changing quality attributes by developing the study on Kano model and Timko's customer satisfaction coefficient, and suggested Potential Customer Satisfaction Improvement index(PCSI) for examining the improvement of customer satisfaction so as to utilize them as an index of differentiated and concrete measurement of service quality.

• 한국산림과학회지
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• 제99권4호
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• pp.508-516
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• 2010

2007년 국립공원 입장료 폐지 후 한라산국립공원 탐방객이 지속적으로 증가함에 따라 적정 이용 수준에 대한 관심이 높아졌다. 본 연구는 한라산국립공원의 적정 수용력 관리에 필요한 영향지표 및 평가기준과 이를 활용할 수 있는 수용력 지표관리프로그램 개발을 위해 수행되었다. 전문가 설문조사를 통해 8개의 영향지표(계곡수질, 탐방객 수, 탐방로 훼손정도, 혼잡 등)를 선정하였으며, 각 영향지표별 현지 조사를 통해 실험적 평가기준을 제시하였다. VERP 모델을 이용한 수용력 지표관리프로그램은 자원 및 탐방행태 변화에 대한 과학적인 분석과 국립공원의 지속 가능성을 평가하는데 효율적일 것이다. 또한, 통합 데이터 관리 및 활용으로 데이터를 체계적으로 관리하여 합리적인 의사결정을 내릴 수 있는 업무수행을 지원한다.

• STI Policy Review
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• 제2권2호
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• pp.45-54
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• 2011

This paper develops a recursive multinomial probit model and describes its estimation method. The recursive multinomial probit model is an extension of a recursive bivariate probit model. The main difference between the two models is that a single decision among two or more alternatives can be considered in each choice equation in the proposed model. The recursive multinomial probit model is developed based on a standard framework of the multinomial probit model and a Bayesian approach with a Gibbs sampling is adopted for the estimation. The simulation exercise with artificial data sets is showed that the model performed well. Since the recursive multinomial probit model can be applied to analyze the causal relationship between discrete dependent variables with more than two outcomes, the model can play an important role in extending the methodology of the causal relationship analysis in innovation research.

• 한국CDE학회지
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• 제3권3호
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• pp.36-45
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• 1997

This paper presents the research on the development of Generic modeling system as a 3D CAD customizing system for the elevator design. This system enables to create a generic model which gives birth to many models. The generic model is expressed as a non-scale model or a standard model in this paper. Using the parametric design techniques, all their relationships are explicitly represented in the tables, not represented in implicit embedded coding. Owing to this method, designers can easily extend the generic model to contain more model families. All parametric relations are stored in relational database. A designer can retrieve various models from a generic model automatically, by using some key input values.

• 한국강구조학회 논문집
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• 제23권5호
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• pp.637-646
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• 2011

본 연구는 철골 구조물의 실시설계 단계에서 활용 가능한 접합부 설계자동화 시스템의 프로토타입 개발에 관한 것으로 보 이음 마찰접합부를 대상으로 한다. 연구에서 접합부 구조설계를 위하여 한국강구조학회에서 발간된 고력볼트 표준접합 설계편람에서 제시하고 있는 표준설계법 및 접합부 표준화 원칙을 검토하고, 수정 보완하였으며, 이를 근간으로 접합부 구조해석 알고리즘을 작성하였다. 작성된 알고리즘을 토대로 접합부 구조설계를 수행하고, 도출된 구조설계 결과로부터 실시설계 단계의 BIM 모델링 소프트웨어에서 접합부 모델을 자동 생성할 수 있는 설계자동화 시스템을 개발하였다. 개발 시스템의 적용성 및 효율성을 검증하기 위하여 개발 시스템으로부터 도출된 접합부 설계 결과(라이브러리 D/B)와 설계편람에서 제시하고 있는 설계 일람표를 비교 검토하였다. 또한 샘플 모델을 대상으로 개발 시스템을 적용하였으며, 접합부 구조설계 결과와 BIM 모델링 소프트웨어와 연동하여 자동 생성된 모델 및 상세도의 속성을 비교 검토하였다.