• 산업경영시스템학회지
• /
• 제22권53호
• /
• pp.45-54
• /
• 1999

Manufacturing today is becoming increasingly competitive. If a company is to exist and successfully compete, it must pay very careful attention to production management, total quality assurance and total proactive maintenance issues. Overall machine performance, repair efficiency, system level utilization, productivity and quality of output need to be optimized as possible. To accomplish that objective, the behavior of manufacturing equipment and systems need to be monitored and measured continuously if it is possible. Then early warning of possible failure should be generated and proacted on that type of the situation to improve overall operation performance of manufacturing environment. In this paper, Proactive maintenance framework using performance-based reliability structure as enabler technology is proposed. Its paradigm enables one to maximize system through-put and product quality as well as resources in the performance domain. In the case of inadequate knowledge of the failure mechanics, this empirical modeling concept along with performance degradation knowledge can serve as an important product and process improvement tool. The real-time framework extension to proposed framework uses on-line performance information and is capable of projecting the remaining useful period.

• 한국신뢰성학회지:신뢰성응용연구
• /
• 제17권1호
• /
• pp.58-65
• /
• 2017

Different from general operating policies applied for various waiting line situations, two complementary dyadic operating policies are applied alternatingly to a single server maintenance service center model. That is, either of the two dyadic Min (N, T) or Max (N, T) policy is applied to operate such center first and the other operating policy should be applied later, and then the same sequence of both operating policies is followed repeatedly. This operating policy is denoted by the Minimax (N, T) policy. Purpose: Because of the newly introduced operating policy, important system characteristics of the considered service center model such as the expected busy and idle periods, the expected number of customers in the service center and so on should be derived to provide necessary information for determination of the optimal operating policy. Methods: Based on concepts of the newly introduced Minimax (N, T) policy, all necessary system characteristics should be redefined and then derived by constructing appropriate relations between complementary two dyadic operating policies. Results: Desired system characteristics are obtained successfully using simple procedures developed by utilizing peculiar structure of the Minimax (N, T) policy. Conclusion: Applying Minimax (N, T) operating policy is equivalent to applying the simple N and T operating policies alternatingly.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2001년도 춘계학술대회 논문집
• /
• pp.213-218
• /
• 2001

These days, corrosion condition of a underground objects is measured by the electric potential between the subject and ground. But this method is implemented by means of manual work with analog voltmeter, which is uneconomic and inefficient. So, We developed real-time On-Line cathodic protection monitoring system that is able to detect corrosion potential conditions of metal objects or various steel structures in the ground continuously, display them with the graphic screen, construct a database, and analyze them simultaneously. Since the data of corrosion and corrosion protection of all underground objects is processed automatically, not manually in this system, It is possible to reduce the manipulated error, and perform precise safety management, maintenance and inspection. As as result, this system can not only guarantee long-life operation, reduction of manpower and cost, but prevent large accidents in advance.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2009년도 춘계학술대회 논문집
• /
• pp.539-545
• /
• 2009

KTX trains which began passenger service between Seoul and Busan in April 2004 have gained very high evaluation for their safe operation. Track is one of the most important means to keep KTX safety, it has not been a fail of safe structure. The track failure during operation may lead to a severe accident. So, it is to be verified the confidence of track maintenance management on the high speed line. This paper would like to find a track deformation trend through a comparative analysis on actual measurement data at these times. It discusses the effect of cyclic dynamic load at welding part. KTX dynamic impact load was measured in accordance with a rail surface irregularity and analyzed some track irregularities according to the condition of rail profile at welding part in the Gyeongbu high speed line.

• 한국정보통신학회논문지
• /
• 제22권3호
• /
• pp.411-417
• /
• 2018

본 논문에서는 재난재해 또는 보안의 이유로 외부와의 통신이 어려운 상황에서도 운용할 수 있도록 외부 데이터 통신 없이 장비와 스마트폰 간의 무선통신만으로 장비 인식과 매뉴얼 데이터 전송을 수행할 수 있는 온라인 매뉴얼 시스템을 설계하고 구현한다. 매뉴얼 데이터가 내장된 매뉴얼 관리 모듈을 대상 장비에 내장한 후 스마트폰에서 수행되는 매뉴얼 앱은 관리 모듈에 부착된 QR 코드 스캔 또는 NFC 접촉으로 장비를 인식하고, 장비가 인식되면 블루투스 통신을 통해 관리 모듈에 내장된 매뉴얼 데이터를 수신하여 웹 템플릿을 이용하여 화면에 표시한다. 구현된 시스템을 실제 산업용 발전기에 설치하여 정전 발생 시 기존의 3단계 처리 과정을 2단계로 줄일 수 있음을 보였다.

• 산업경영시스템학회지
• /
• 제30권3호
• /
• pp.103-108
• /
• 2007

This paper presents the conceptual framework for estimating and predicting system's susceptibility to failure as function of condition parameter value which is representing the current status of performance measure using on-line performance reliability. The performance of such system depends on one parameter with a probability distribution that degrades with time gracefully. Performance reliability represents the probability that physical performance will remain satisfactory over a finite period of time or usage cycles in the future. An empirical physical performance function is constructed to incorporate explanatory variables (operating and environmental conditions) over a time or usage dimension. This function enables one to model device performance and the associated classical reliability measures simultaneously, in the performance domain and time domain. The conditional performance reliability structure developed represents a tool to predict system performance over time or usage for next usage period. By enabling such a framework, it can bring us more efficient planning and execution in system's operation control as well as maintenance to reduce costs and/or increase profits.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2007년도 정기학술발표대회 논문집
• /
• pp.562-566
• /
• 2007

공동주택의 리모델링에서는, 견해차와 이해의 대립으로 프로젝트추진이 지연되는 경우가 많다. 이러한 분쟁은 공용부분과 전용부분의 애매한 경계선과 구분 때문인 경우가 많다. 본 연구에서는 한국과 일본의 현행관리규약이 이와 같은 관점에서 고찰되었다. 결론을 간추리면 다음과 같다. 1)현행관리규약에 의하면, 소유, 사용 및 관리의 정의에 있어서 일본이 한국보다 구체적이다. 2)공용부분과 전유부분의 구분은 외벽의 내측선이 한국과 일본에서 공통적으로 기준이 되어있다. 그러나 한국은 일본 보다 목적과 실행, 정의와 기술에서 일관성이 부족하다. 3)일본은 공유의 위계를 단지-주동-개별 주호로 구분하여 정의하고 있으나, 한국은 그렇지 않다. 4)일본은 전용으로 사용되는 공유부분에 대하여 정의 하고 있으나, 한국은 그렇지 않다.

• 한국의류학회지
• /
• 제29권1호
• /
• pp.58-67
• /
• 2005

This study was aimed at the development of scales measuring appearance management behaviors of career men for on-line image consulting. The purposes of this study were to develop a scale which can measure fashion orientation of career men and classify them according to fashion orientation. The data were collected from 380 career men for the first survey and 372 career men for the second survey in Seoul, Korea and were analyzed by factor analysis, reliability test, cluster analysis, one-way ANOVA and Duncan test. The results from this study were as follows: 1) Ten factors of fashion orientation were identified: clothing interest, satisfaction in clothing-selecting ability, individuality and self expression, interest in appearance management, appearance improvement and mood enhancement, clothing conformity, putting value on attractive appearance, maintenance of neat appearance, weight control and pursuit of fashion. The total variance explained by the ten factors was $65.70\%$ and Cronbach's $\alpha$ of 10 factors ranged from $.60\~.92.$ 2) Three groups were classified by the representative items of fashion orientation factors : passive appearance management group who were conscious of other people, positive appearance management group who were highly fashion-oriented and indifferent group to appearance management. The fashion orientation characteristics of groups classified in the second survey were nearly similar to those in the first.

• 한국지리정보학회지
• /
• 제24권4호
• /
• pp.136-147
• /
• 2021

현재 자율주행 관련 기술은 주행의 정도를 적용하여 단계별로 발전하고 있다. 자율주행 차량이 움직이는 도로에 대한 운영 관리 기술도 자율주행 기술에 발맞춰 발전해야 하는 것은 필수적이다. 그러나 현재 도로 운영 관리의 경우 2차원 정보만을 사용하여 관리되고 있어 차로 및 시설물 정보관리, 유지 보수의 체계화된 운영 관리에 한계를 보이고 있다. 본 연구는 현재 2차원 공간데이터를 기반으로 관리하고 있는 차로 및 시설물 운영 관리 시스템을 정밀도로 지도 데이터와 실시간 빅 데이터 처리가 가능한 융합 형태의 데이터베이스를 설계하여 3차원 공간정보 기반의 운영 관리가 가능한 운영 관리 시스템 아키텍처 구성 방안을 제시하였다. 본 연구를 통해 향후 정밀도로 지도를 기반으로 한 운영 관리 시스템을 구축하여 차로 및 시설물 유지관리에 사용할 경우 시설물을 시각화하여 관리할 수 있으며, 다중 사용자의 데이터 편집 및 분석이 가능하고, 다양한 GIS S/W와 연동이 가능하며, 보안 및 백업·복구 등의 기능이 강화되어 대용량의 실시간 데이터를 효율적으로 처리할 수 있을 것으로 판단된다.

• 국제학술발표논문집
• /
• The 6th International Conference on Construction Engineering and Project Management
• /
• pp.32-36
• /
• 2015

This study explores the issue of program management consortia involving multinational participants. The aim of this research was to leverage advantages in program management (PM) skills and PM model improvement in product line construction in mega scale construction programs, typically funded by public funds. Such ventures involve multinational parties using dedicated partnering based on a program management consortium (PMC) to reduce confrontation between parties in complex circumstances, allowing an open and non-adversarial approach to project management. This research also seeks to implement an ongoing feedback program of best practices and lessons learned to minimize the repetition of mistakes and to reduce costs in sequenced construction. Recently, the Korean government has planned to undertake three large new projects: the Korean Peninsula major river maintenance, the reclamation of Se-Mangum, and the Science/Business City. This paper starts by providing a framework for the cost-reduction strategy for the United States Forces Korea (USFK) Relocation Program, which will be funded with public funds and a private fund investment (PFI) that combines programs executed by two governments as owners and multinational stakeholders, joined in the PMC. The establishment of project-oriented consortia is an innovative and non-adversarial approach to massive international construction projects. Such projects have used various tools effectively and skillfully. This experience may offer an opportunity to practice new and advanced program management delivery methods, and it is expected that Korea will gain a competitive advantage in the international construction market.