• Journal of the Korean Society for Railway
• /
• v.12 no.3
• /
• pp.342-347
• /
• 2009

Failure Mode Effects and Criticality Analysis (FMECA) is one of most widely used methods in modern engineering system to investigate potential failure modes and its severity upon the system. While performing FMECA, the experts evaluates criticality and severity of each failure mode and visualize the risk level matrix putting those indices to column and row variable respectably. Which results uncertainty in the result. In order to handle the uncertainty and conclude risk level matrix, this paper proposes a new FMECA procedure using minimal cut set (MCS) and fuzzy theory. Severity is calculated by proposed structural importance while criticality is determined by typical equipment failure rate data from IEEE Std 493. Finally, the risk level is compounded of these indices.

• Journal of Korean Society of Archives and Records Management
• /
• v.20 no.1
• /
• pp.47-67
• /
• 2020

Unless the records appraisal system is properly overhauled, there is no future for public records management. This study aims to highlight challenging issues and present improvement tasks necessary for the readjustment of the public records appraisal system at the national level. First, public records appraisal policies are divided into five categories: i) statements on appraisal policy and selection criteria, ii) appraisal tools such as disposition authorities, iii) subject of appraising, iv) appraisal procedures, and v) responsibility and authority in appraisal and disposition process. Second, the domestic situation is identified for each category. Third, policies of the United States, United Kingdom, Australia, and Canada are compared, and implications are derived for each category. Fourth and last, the tasks for the readjustment of the public appraisal system are proposed based on these analyses.

• Journal of the Korea Society of Computer and Information
• /
• v.4 no.3
• /
• pp.60-66
• /
• 1999

The purpose of this study is to design and materialize the simulated courseware which is based on new educational environments and student-based education. The scope of this study is reflection and refraction of in the physics of high school. This paper introduce the theoretical background of courseware and investigate the structure and process of the teaching-theory by visualized computer simulation. We applied the basic concept about the reflection and refraction of light and explained the simulated images of spherical mirror and lens with the principles expressions and relative image forms. The last we simulated the various kinds of the images, shapes and distance of the images by changing the distance of object and focus which are made by computer simulation.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2023.05a
• /
• pp.410-410
• /
• 2023

최근 한국에서는 기후변화에 따른 영향으로 집중호우의 발생 빈도와 강우강도 증가 및 지속적인 도시침수로 인한 인명 및 재산 피해가 발생하고 있다. 도시침수 예측은 수치모델링, 강우기반의 침수예측 연구가 주를 이루고 있으며, 정량적인 침수계측데이터를 활용한 분석기술은 부족한 실정이다. 침수지도, 침수예측 결과 검증과 더불어 센서기반의 정량적인 침수심 계측 결과를 활용한 도시침수 관리기술 개발이 필요하다. 현재 개발된 침수센서는 개발 주체에 따라 센서 관리 규정이 각각 상이하며, 정해진 규격과 기본적인 성능기준이 부재함에 따라 예산, 유지관리 등 비효율적인 사례가 발생하고 있다. 이에 본 연구에서는 침수센서의 설치시 효율화와 시행착오 등을 방지하기 위해 침수센서의 설치 및 운영에 필요한 성능기준과 설치방법 등을 가이드라인으로 제시하고자 하였다. 가이드라인을 작성하기 위해 도심지 침수센서 관련 설치절차, 설치위치 선정방안, 측정주기, 점검 및 관리 방안 등에 대한 국내외 사례를 조사하였으며, 사례 분석을 통해 침수센서 가이드라인 목차를 도출하였다. 가이드라인 목차로는 침수센서 세부구성 및 작동원리를 기술한 표준모델 구축 방안과 지표, 지표하 등의 계측지점별 센서 설치방안, 현장설치 절차도, 시운전지침으로 구성하였다. 향후 가이드라인을 통해 침수센서를 효율적으로 운영하여 도시침수 발생시 선제적 대응체계 강화 방안 마련에 활용될 수 있을 것으로 판단된다.

• Journal of the Korea Convergence Society
• /
• v.11 no.5
• /
• pp.209-217
• /
• 2020

The background of the research is the following. With the prosperity of drone industry, the government has been actively promoting measures to nominate 'drone photographing free areas'. However, existing laws, and procedures are rather unclear with related environmental factors in discordance with one another. Hence, voices in need for establishing a clear precondition for nominating drone photography free area have been rising. The purpose of the research is to provide measures for the preconditions to establish photography free areas for convenient drone photographing. The research utilizes literary methods, conducting focus group interviews to coordinate with specialists who can participate and discuss so that they can provide improvement measures. The research renders improvement measures in different sectors including 2x items in aviation security law, 8x items in free area nomination and procedure, 4x items in infrastructure establishment and information management area. The expected effects are the following: by attaching drone photography with aviation security law, nominating photography free area can be linked up with the Ministry of Land Infrastructure and Technology. Secondly, by enlarging photography restricted area to upper mid-air, a three dimensional drone security will be possible. Thirdly, by providing a 'Yongin area standard model', free area nomination will become more easy. Future research will focus on enhancing aviation security law regarding drone photographing. In addition, the promotion to nominate free areas for 33x responsible areas in accordance with the National Intelligence service will be required.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.7
• /
• pp.63-72
• /
• 2017

This paper proposes a procedure to improve the operational efficiency of the automotive parts manufacturing process by applying classical IE techniques composed of process analysis, work method analysis, and motion analysis, and a specific application case is outlined. The proposed procedure was developed originally by the Task Force organized in L company's automotive parts manufacturing business unit. The balance efficiency and production capacity were used as measures of operational efficiency. The developed procedure follows the general procedure of analyzing the phenomenon at the manufacturing shop, deriving an improvement solution to solve the problem, evaluating each derived alternative, and implementing it to the field to achieve productivity improvement. Among the methods used in each phase of the procedure, function analysis used in the waste discovery phase and R&R evaluation method used in the alternative assessment phase are unique techniques developed by L company's TF. The R&R Evaluation method techniques are described in detail because this method is highly applicable and extensible. A case of applying developed procedures to improve the EPS motor manufacturing process is discussed. As a result, the line balance efficiency and production capacity were increased to a satisfactory level.

• International Journal of Highway Engineering
• /
• v.9 no.2 s.32
• /
• pp.115-127
• /
• 2007

Developed countries, especially in road construction and management fields, introduce new road porjects such as National Scenic Byways Program(NSBP program) in USA and the Eco-road project in Japan. This study develops a conceptual model for deploying new road projects in Korea. The four step approach is suggested to create new road projects, including foundation of an act based on the existing Road Act, creation of new road project ideas, development of evaluation process and guidelines, and enhancement of an administrative scheme. To create new road projects, three different ways are devised; (1) designation of national roads having uniqueness in overall spectrum, (2) designation of roads having intrinsic values in a different aspect, (3) designation of single structures of engineering outcomes such as bridges, tunnels, new design techniques, considerable Value Engineering output, and well analyzed Life Cycle Cost Analysis practices. For the evaluation process, NSBP program of USA and/or Sustainable City Award program of Korea would be recommended. An administrative scheme and integrated funding process for the new road projects are also suggested based on evaluation of tasks of each team or division of Korea Ministry of Construction and Transportation.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.04b
• /
• pp.901-903
• /
• 2004

어떤 용어가 전문적인 개념을 많이 내포하고 있을 때 전문성(specificity)이 높다고 말한다. 본 논문에서는 정보이론에 기반한 방법으로 전운용어가 내포하는 전문성을 정량적으로 계산하는 방법을 제안한다. 제안한 방법은 전문용어의 구성정보를 이용하는 방법과 문맥정보를 이용하는 방법으로 나눈다. 구성정보를 이용하는 방법에서는 전문용어틀 구성하는 단어의 빈도수, tf.idf 값, 내부 수식구조 등을 이용하고, 문맥정보를 이용하는 방법에서는 전문용어를 수식하는 단어들의 분포를 이용한다. 제안한 방법은 분야에 독립적으로 적용될 수 있고, 전문용어 생성 절차에 대한 특징을 잘 표현할 수 있는 장정이 있다. MeSH 트리에 포함된 질병명을 대상으로 실험한 결과 82.0%의 정확률을 보였다.

• The Journal of the Korea Contents Association
• /
• v.11 no.11
• /
• pp.70-78
• /
• 2011

Today cases of using individual service on community TV are increasing with the advent of smart TV. The traditional way for using individual service like e-mail or SNS on TV is not simple and puts in too much time because it has to type so many text using remote control that is unsuitable for typing. In this paper, interaction using cube remote control is proposed in order to facilitate individual service on TV. It is simple interaction like shaking and tapping instead of a complex interaction method. In addition, it is believed that the proposed simple interaction using cube interaction might be one of great alternatives for using individual service on smart TV.

• Journal for History of Mathematics
• /
• v.17 no.3
• /
• pp.109-120
• /
• 2004

This study investigated three pre-service teachers' mathematical problem solving among hand-in-write-ups and final projects for each subject. All participants' activities and computer explorations were observed and video taped. If it was possible, an open-ended individual interview was performed before, during, and after each exploration. The method of data collection was observation, interviewing, field notes, students' written assignments, computer works, and audio and videotapes of pre- service teachers' mathematical problem solving activities. At the beginning of the mathematical problem solving activities, all participants did not have strong procedural and conceptual knowledge of the graph, making a model by using data, and general concept of a sine function, but they built strong procedural and conceptual knowledge and connected them appropriately through mathematical problem solving activities by using the computer technology.