• 지능정보연구
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• 제12권3호
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• pp.47-65
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• 2006

최근 컨테이너 터미널의 생산성 향상을 위한 자동화가 국내외에서 활발히 이루어지고 있다. 이에 따라 컨테이너 터미널의 개별 장비에 대한 효율적인 운영 방안에 대한 연구가 많이 진척되어 왔다. 하지만 터미널 전체 생산성을 높이기 위해서는 개별 장비의 효율을 높이는 것뿐만 아니라 장비들간의 동기화가 잘 되어야 할 필요가 있다. 본 논문에서는 컨테이너를 쌓아두는 장치장에서 컨테이너를 장치하는 크레인, ATCs(Automated Transfer Crane)와 장치장과 안벽간에 컨테이너를 이송하는 내부트럭, YTs(Yard Truck)의 효율적인 실행 계획을 실시간에 수립할 수 있는 휴리스틱 조합을 제시한다. 이와 함께 컨테이너의 장치 위치 결정을 위한 적합한 장치 전략과 각 작업에 배정할 YT의 적합한 선택 범위에 대해서도 시뮬레이션 실험을 통해 보여준다.

• 산업공학
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• 제25권1호
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• pp.127-133
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• 2012

This paper considers the preventive maintenance scheduling problem of the cluster tool which is one of the most important manufacturing equipments in the next-generation semiconductor production environment. We define a random process that expresses the successive amount of chemicals accumulating inside the tool. Based on the renewal theory, we find the expected value and probability distribution of the time that the amount of accumulated chemicals exceeds a predetermined level. For a given probability that the accumulated chemicals exceeds the predetermined level we present a method to obtain the number of chamber operations to perform the preventive maintenance of that chamber. In addition, a method to get the preventive maintenance schedule for the whole cluster tool is presented. A numerical example is provided to illustrate our method.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.165-173
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• 2005

Generally, the instrumentation scheme for urban excavation projects consist of a series of tools such as inclinometer piezometer, loadcell, tiltmeter etc. Because almost every equipments are placed along several typical lines, it is impossible to evaluate the whole behavior of structures and adjacent buildings simultaneously. With laser scanning technique developed for surveying, all visible structures are scanned in the form of 3D digital data in a time schedule as planned. It can be analysed effectively the movements for all area affected by excavation even the spots in where no instrumentation tools. Although there are some parts to be refined such as scanning error, proper analysing software, it gives many advantages for realistic instrumentation works in the near future.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
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• pp.263-268
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• 2001

Two ways of improvement of the strut for the HCF was made in this paper. The strut for the existing HCF is a passive link, which results the posture of the HCF and related bones. The accuracy of the HCF depends on the accuracy of the strut length. A "digital gage" was proposed to increase the accuracy of the strut by presenting the measuring result as figures in manual mode operation. And a "motorized strut system" was designed for the automated HCF operation. A strut was equipped with a motor, "motorized strut" can be operated manually and automatically. In automatic mode, the HCF operating data is generated by the HCF schedule package in PC and is downloaded to the "motorized strut system" controller. By these two improvements, changes in orthopedic equipments like HCF and other Ilizarov fixators are expected.

• 대한안전경영과학회지
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• 제16권3호
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• pp.71-79
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• 2014

The scale of construction industry recently tends to become bigger and larger in line with development of construction technologies and methods. Although increasing usage of construction machinery has led to improving productivity, reducing schedule and cost, constructions workers have been exposed to unstable work environment, causing more and more accidents. Construction machinery-related laws and regulations has not been enacted and reflected the conditions and circumstances of the construction industry in a timely manner. A various construction machinery and equipments produced and changed in structure randomly are so widely used that related-accidents may occure gradually. Propose a plan for accidents prevention through the analysis of characteristics and cases on construction machinery-related accidents over the past five years from 2009 to 2013.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.705-706
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• 2007

전력 산업구조 개편이 진행됨에 따라 배전부문에는 독립사업부제를 도입하게 되었다. 각 사업부들은 타 사업부와의 경쟁을 경험하게 된다. 배전사업부들은 효율성을 높이기 위해 노력할 것이다. 즉, 최소의 비용으로 최대의 효과를 얻을 수 있는 방법을 개발하기 위해 노력할 것이다. 배전계통 운영에 많은 부분을 차지하는 유지보수에 대해서, 비용은 줄이고 효율성을 높이는 방향을 선택할 것이다. 이에 본 논문에서는 유지보수 기법 중 하나인 RCM 기법을 이용한 유지보수 계획 수립시 고려해야 할 전반적인 사항에 대해 고찰하였다.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.41-49
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• 2007

GS E&C had developed construction management system, PMS which is based on EVMS in 1997. Recently, TPMS has developed for effective construction management through applying daily schedule management and JIT on materials, labors, equipments focusing field work. TPMS realizes "Shielding" and "Make-Ready Process" which are the main concept of Lean construction. Through this system, it can manage and plan daily field work, support the field work related material, labor, and equipment planning, and minimizes the non-valuable process. This paper introduces the concept of TPMS, and through established system, it can lead the construction culture and raise the competitive power of construction industry

• 한국정보통신학회논문지
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• 제19권7호
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• pp.1585-1592
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• 2015

현재 선박수리를 위해 수리조선소 공무감독관의 수기대장기반 일정관리에 의존하고 있다. 단순 수기대장 관리는 장비 및 인력의 실시간 현황분석이 어려워 효율적이지 못한 일정관리가 되며, 이러한 문제점을 해결하고자 선박수리산업에 ICT기반 일정관리 방법이 요구된다. 본 논문에서는 효율적인 선박수리 일정관리를 위하여 ICT기반 일정관리 시스템을 제안한다. 제안된 시스템을 이용하여 운용중인 수기대장의 일정관리의 문제를 해결하도록 한다. 수리과정상 진도에 문제가 발생할 경우 빠른 대처가 가능하며, 인력 및 장비의 효율적인 운영을 통하여 선박수리과정의 업무 능률을 극대화할 수 있다.

• 산업경영시스템학회지
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• 제43권1호
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• pp.143-150
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• 2020

To enhance the effectiveness of the FMS (flexible manufacturing system), it is necessary for the manufacturing control system to be upgraded by integrating the cyber and the physical manufacturing systems. Using the CPPS (Cyber-Physical Production System) concept, this study proposes a 4-stage vertical integration and control framework for an aircraft parts manufacturing plant. In the proposed framework, the process controller prepares the operations schedule for processing work orders generated from the APS (advanced planning & scheduling) system. The scheduled operations and the related control commands are assigned to equipments by the dispatcher of the line controller. The line monitor is responsible for monitoring the overall status of the FMS including work orders and equipments. Finally the process monitor uses the simulation model to check the performance of the production plan using real time plant status data. The W-FMCS (Wing rib-Flexible Manufacturing Control & Simulation) are developed to implement the proposed 4-stage CPPS based FMS control architecture. The effectiveness of the proposed control architecture is examined by the real plant's operational data such as utilization and throughput. The performance improvement examined shows the usefulness of the framework in managing the smart factory's operation by providing a practical approach to integrate cyber and physical production systems.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2164-2168
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• 2003

Real time control system such as in factory automation fields, defense field, aerospace, railway industries, financial trading and so forth, includes multiple computers on multiple nodes, and share data to process various actions and functions. This is similar to multitasking in a multiprocessor computer system. The task processing efficiency of such system is proportionally increased by process speed of each process computer. And also it is greatly influenced by communication latencies of each node. To provide proper operation of such real time system, a network that can guarantee deterministic exchange of certain amount of data within a limited time is required. Such network is called as a real time network. As for modern distributed control system, the timeliness of data exchange gives important factor for the dynamics of entire control system. In a real time network system, exchanged data are determined by off-line design process to provide the timeliness of data. In other word, designer of network makes up a network data table that describes the specification of data exchanged between control equipments. And by this off-line design result, the network data are exchanged by predetermined schedule. First, this paper explains international standard real time network TCN (Train Communication Network) applied to the KHST (Korean High Speed Train) project. And then it explains the computer program developed for design tool of network data table of TCN.