• 대한기계학회논문집A
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• 제27권11호
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• pp.1933-1940
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• 2003

Recently, the importance of plant maintenance(PM) was highly raised to provide efficient plant operation which highly affects the productivity. For this reason, a number of engineering methodologies, such as risk-based inspection(RBI), fitness for service guidelines(FFS), plant lifecycle management(PLM), have been applied to improve the plant operation efficiency. Also, a network-based business operation system, which is called ERP(Enterprise Resource Planning), has been introduced in the field of plant maintenance. However, there was no attempt to connect engineering methodologies to the ERP PM system. In this paper, a knowledge-based information system for the plant operation of steel making company has been proposed. This system which is named as K-VRS(Knowledge-based Virtual Reality System), provides a connection between ERP plant maintenance module and knowledge-based engineering methodologies, and thus, enables network-based highly effective plant maintenance process. The developed system is expected to play a great role for more efficient and safer plant maintenance.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.905-910
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• 2003

Most of previous research on machining process planning has not fully included consideration on fixturing. With fixture components properly assembled with the part workpiece in a CAD modeling environment, necessary geometric information of fixture elements and their interrelations with the part model can be obtained so that machining process plans could incorporate fixturing considerations. This paper introduces an interactive fixturing system called I-Fix. I-Fix is a dowel-pin based modular fixture system, and it has been developed using Solid Edge CAD system and Visual Basic. Through customized operations of the assembly commands of the CAD system, I-Fix significantly simplifies user operations and thus reduces fixturing time. Furthermore, I-Fix enhances user convenience by providing general guidance about the fixture components and fixturing methods.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2003년도 춘계학술대회 논문집
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• pp.17-21
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• 2003

This paper presents a CAD interface system that imports CAD model data and exports input information to a CAPP(Compute Aided Process Planning) system to generate a sequence for block assembly operations. In developing this system we use an open architecture CAD kernel, OpenCASCASE. The functions of the system developed are visualization of the product, definition of relations between parts, and generation of relation graph and input file for CAPP. The functions are demonstrated with a simple example.

• 농촌계획
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• 제2권2호
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• pp.109-117
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• 1996

The purpose of this study Is to develop water quality management system fort a farm village stream. The framework design of the system and the ecological monitoring of a test watershed were carried out, The system consists of GIS(Geographic Information System ), database, pollution source management, water quality and hydrologic analysis. Suri watershed located on Idong, Yongin city, Kyunggi Province, was selected as the test watershed for the application of the system. The fifteen's monitoring stations were chooses at up- and down-stream of the watershed. The results of an aquatic ecological monitoring were analyzed by the GPI(Group Pollution Index) method. The GPI revealed that water quality was varied within the stream. GPI and DO map for the watershed stream were developed, These maps facilitated to analyze the spatial distribution of the water quality.

• 전자공학회논문지 IE
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• 제46권1호
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• pp.23-30
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• 2009

본 논문에서는 산업용 AGV 시스템의 효과적이고 지능적인 경로설정을 위한 스테레오 카메라 시스템 기반의 지능형 시각시스템을 제안하였다. 즉, 평행식 스테레오 카메라를 이용하여 좌, 우 입력 영상간의 시차지도와 깊이정보를 검출하고, AGV 시스템과 장애물간의 거리와 위치좌표인 2차원 경로좌표를 산출하여 장애물과 다른 물체들과의 상대 거리를 산출하였다. 산출된 2차원 경로좌표를 토대로 AGV 시스템의 효과적이고 지능적인 경로설정에 따라 자율적으로 주행하게 된다. 실 시간적으로 입력되는 스테레오 영상을 사용하여 실험한 결과 AGV 시스템과 전방에 존재하는 장애물간의 거리 오차가 평균 2.5%이하로 유지됨으로써 산업용 AGV 시스템의 적응적 경로설정을 위한 지능형 시각 시스템의 구현 가능성을 제시하였다.

• Spatial Information Research
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• 제19권3호
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• pp.43-52
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• 2011

최근, 모바일 시스템에서 DBMS를 활용한 위치기반서비스에 대한 관심이 높아지고 있으며, 향상된 차량항법 (in-vehicle navigation) 시스템에 있어 효과적인 저장, 트랜잭션 관리, 모델링과 공간 질의를 통해 현행 파일 기반 시스템이 가지는 한계를 극복할 것으로 기대되고 있다. 특히, 도로 네트워크 데이터는 경로 탐색 시스템에 있어 가장 중요한 영역에 해당하며 효율적인 관리와 유지를 필요로 한다. 이에 본 연구는 모바일 LBS 시스템에서 위상적인 네트워크 데이터를 위한 그래프 기반 지오 데이터베이스 모델 개발과 휴리스틱 접근에 기반을 둔 동적 경로 계산 알고리즘을 제시하는 것을 목적으로 한다. 이를 위해, 계층적 네트워크를 지원하는 데이터 모델을 설계하고, 모바일 LBS 시스템에서 수행 능력을 평가하기위한 경로 계산 시스템을 구현하였다. 마지막으로, 제시된 계층 그래프 모델 기반 경로 계산 알고리듬은 네트워크를 구성하는 노드 개수를 줄여 탐색 속도와 효율적 메모리 사용에 기여할 수 있을 확인 할 수 있다.

• 인터넷정보학회지
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• 제14권3호
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• pp.68-77
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• 2013

This article consists of 3 parts. Part I is multi stakeholder approach on Internet governance system. Part II is analysis of the Korean Internet governance system. In this part, I explain relevant laws in Korea, including Korean Internet Address Resources Act. Part III is my suggestion on Korean Internet governance system using a multi stakeholder approach. First of all, the keyword of the Internet governance system is decision making process: that is, consensus based versus top-down approach. Then who are major players in Internet governance in national level? Government, or Private sectors such as business and civil society. Korean legal system for Internet governance shows a top-down decision making process. Major players are the government (that is, Ministry of Science, ICT and Future Planning) and KISA affiliated with the government. Other players include Internet Address Policy Committee, Korea Internet Governance Alliance, and NGOs. The key statute for Internet governance in Korea is Internet Address Resources Act of 2004. Articles 3 and 5 require the Ministry of Science, ICT and Future Planning to take a proactive role in Internet governance. The government shall consult with the Internet Address Policy Deliberation Committee for Internet governance. Yet this Committee is established under the control of the Ministry of Science, ICT and Future Planning. All members of this Committee are also commissioned or nominated by the Chairman of the Ministry. Meanwhile, there are also non-official organizations, including Sub-committee on Address & Infrastructure of Korea Internet Governance Alliance. I suggest to reform decision making process of Korean Internet governance system based on BOTTOM-UP process for CONSENSUS BASED DECISION. My suggested system includes the following: (1) The government hands over a major role in Internet governance to INDEPENDENT Internet policy organization. And the government participates in such organization as ONE of the players. (2) Nomination of this committee member must be bottom-up process for a genuine multi-stakeholder model including civil society, commercial organization, end-users and experts. (3) The government should establish plan for supporting the private sector's international activity on the long-term basis.

• Journal of Electrical Engineering and Technology
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• 제9권2호
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• pp.433-440
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• 2014

In this study, a method for the low-carbon active distribution system (ADS) planning is proposed. It takes into account the impacts of both network capacity and demand correlation to the renewable energy accommodation, and incorporates demand response (DR) as an available resource in the ADS planning. The problem is formulated as a mixed integer nonlinear programming model, whereby the optimal allocation of renewable energy sources and the design of DR contract (i.e. payment incentives and default penalties) are determined simultaneously, in order to achieve the minimization of total cost and $CO_2$ emissions subjected to the system constraints. The uncertainties that involved are also considered by using the scenario synthesis method with the improved Taguchi's orthogonal array testing for reducing information redundancy. A novel cuckoo search (CS) is applied for the planning optimization. The case study results confirm the effectiveness and superiority of the proposed method.

• 디지털융복합연구
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• 제10권2호
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• pp.231-235
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• 2012

생산정보시스템(Manufacturing Information System)은 생산기능을 구성하는 생산기획, 작업관리, 공정의 운영과 통제 그리고 생산실적관리 등과 관련된 활동을 지원하는 정보시스템이라 할 수 있다. 최근 생산 현장은 생산 고도화를 위하여 디지털 정보화 및 통합화에 대한 새로운 변화를 맞고 있다. 따라서 본 논문에서는 현재 생산정보화 시스템의 이슈들을 알아보고, 새로운 변화에 적응하기 위한 주요한 이슈 및 요소들을 제시한다. 마지막으로 이러한 요소들을 기반으로 하여 제조생산 정보화시스템 구축을 위한 비즈니스 인텔리전스 시스템을 제안한다.

• 산업공학
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• 제15권4호
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• pp.325-337
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• 2002

In this study we consider the problem of production planning of TFT-LCD(Thin Film Transistor - Liquid Crystal Display) production factory. Due to the complexities of the TFT-LCD production processes, it is difficult to schedule the production planning, and the study about automated scheduler is insufficient. In addition, the existing production method is a Push-System to raise the operation rate with expensive equipment, that has the problem to satisfy the due-date. This study presents an algorithm having a concept of Pull-System that satisfies the due-date and considers specialties of TFT-LCD production process. We make MPS(Master Production Schedule) according to the sales order, and present algorithms for scheduling about In/Out plan considering factory capacity, line balancing, material requirement, and inventory level of all Array, Cell, and Module processes. These algorithms are integrated as an automated production system, and we implement them in the actual TFT-LCD factory circumstance.