• 제어로봇시스템학회논문지
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• 제5권1호
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• pp.54-61
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• 1999

Objective of the research is to put the vast and complex fault tracking knowledge of human experts in semiconductor production line into the knowledge base of computer system. We mined the fault tracking knowledge of domain experts(engineers of production line) for the construction of knowledge base of the expert system. Object oriented fact models which increase the extensibility and reusability have been built. The rules are designed to perform the fault diagnosis of the items in production device. We have exploited the evidence accumulation method to assign check priority in rules. The major contribution is in the overall design and implementation of the nile base and related facts of the expert system in object oriented paradigm for the application of the system in fault diagnosis in semiconductor production line.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1094-1099
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• 2009

Workforce information is important in production planning because production planning requires matching a production unit's capacity to loads of assignments. However, tracking and managing workforce information such as skills and accident history is not an easy job. This paper describes a prototype database system for a workforce database system that employs RFID technology. This system tracks daily workforce production capacity on sites. A pilot project is described to explore the benefits and possibility of using radio-frequency identification (RFID) to track and manage workforce information, and is followed by the results of a survey to identify benefits. In addition to the survey identifying the benefits of the database system, the paper also presents a list of challenges through a series of interviews.

• 한국CDE학회논문집
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• 제14권6호
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• pp.424-433
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• 2009

In order to improve productivity and efficiency of ship production process, production technology converged with Information Technology can be considered. Mid-term scheduling based on long-term schedule of ship building and execution planning based on short-term production schedule have an important role in ship production processes and techniques. However, data used in the scheduling are from the experiences of the past, cognitive, and often inaccurate, moreover the updates of the data by formatted documents are not being performed efficiently. This paper designs the tracking and monitoring system for the curved plates forming process with shop level. At first step to it, we redefine and analyze the curved plates forming process by using SysML. From the definition and analysis of the curved plates forming process, we design the system with respect to operational view considering operational environment and interactions between systems included and scenario about operation, and with respect to system view considering functionalities and interfaces of the system. In order to study the feasibility of the system designed, a prototype of the system has been implemented with 13.56 MHz RHD hardware and application software.

• 한국콘텐츠학회논문지
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• 제11권6호
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• pp.135-143
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• 2011

영화 등에서 컴퓨터그래픽 기술은 전체 흐름의 중심을 차지하는 핵심적인 요소이며, 미국 등에서 개발된 첨단 영상 기술을 바탕으로 디지털콘텐츠 산업을 견인하면서 비약적인 성장을 이루고 있다. 그러나 국내의 경우, 영상 콘텐츠의 제작 과정에서 연구개발을 병행하기 어려운 열악한 상황이고 해외 상용 툴에 대한 의존도가 높고, 노동 집약적인 제작 파이프라인(pipeline)으로 구성되어 있다. 이러한 문제점을 극복하기 위하여 개발된 하드웨어 및 소프트웨어 연구 결과물을 기술하였으며, 개발된 시각효과 기술을 바탕으로 시범 콘텐츠("The Sixty-miles-an-hour man")의 제작 과정을 정리하였다. 특히 정확한 카메라 모션추적 및 자연스러운 영상합성이 이루어지도록 실제의 동적 환경에서의 다양한 촬영 및 기술적 요소를 고려하였다. 또한 시나리오를 작성하는 과정에서 기술 개발자와 콘텐츠 제작자간의 상호이해와 협력이 중요하며, 이를 통해 제작현장에서 핵심 기술 요소의 도출 등의 중요성을 확인하였다. 그리고 제작효율성을 높이기 위해 필요한 요소기술을 도출해 제작환경의 구조개선 및 확장 가능성 등에 대한 고려가 요구된다.

• Current Photovoltaic Research
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• 제1권2호
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• pp.122-125
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• 2013

The Floating Photovoltaic System was installed on the surface of water. There were some researches in this subject. But there was not many studies with experiment on a high waterproof Floating Photovoltaic modules. The aim of this study was to analyze the performance of the Floating Photovoltaic System. For this experiment, a high waterproof Floating Photovoltaic modules were designed and applied to the module capacity of 10 kW Tracking-Type structure. The experiment results indicated the performance of the daily production is 51.6 kW; the production capacity of Floating Photovoltaic System is expected to be 23% higher than that of the ground-mounted photovoltaic system.

• 산업경영시스템학회지
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• 제42권3호
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• pp.80-88
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• 2019

Recently, automobile manufacturing companies, which are major customers of them, are requiring IATF 16949 (ISO/TS 16949) certification as a mandatory requirement to secure product quality. In particular, IATF 16949 : 2016, revised in October 2016, was reinforced product traceability requirements for production information management by lot in the production process. Therefore, small and medium-sized precision parts processing companies in the automobile industry are very difficult to survive due to quality and price competition for customers satisfaction. MES (Manufacturing Execution System) is required to solve this problem. However, small and medium sized precision parts processing enterprises are reluctant to introduce the MES which is not suitable for the manufacturing environment of them such as high cost and low utilization. Even if the system is introduced, it is difficult to operate and maintain the system because the lack of computer manpower. In this paper, we propose a method for building a lot tracking system for small and medium precision parts processing companies by reviewing relevant literature and analyzing cases. In addition, by managing the production history for each lot of the final product in the system, we will grasp the effect of reducing the quality failure cost obtained by minimizing the range of defect selection.

• KSBB Journal
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• 제29권4호
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• pp.225-231
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• 2014

A microbial fuel cell (MFC) and bioelectrochemical systems are novel bioprocesses which employ exoelectrogenic biofilm on electrode as a biocatalyst for electricity generation and various useful chemical production. Previous reports show that electrogenic biofilms of MFCs are time varying systems and dynamically interactive with the electrically conductive media (carbon paper as terminal electron acceptor). It has been reported that maximum power point tracking (MPPT) method can automatically control load by algorithm so that increase power generation and columbic efficiency. In this study, we developed logic based control strategy for external load resistance by using $LabVIEW^{TM}$ which increases the power production with using flat-plate MFCs and MPPT circuit board. The flat-plate MFCs inoculated with anaerobic digester sludge were stabilized with fixed external resistance from $1000{\Omega}$ to $100{\Omega}$. Automatic load control with MPPT started load from $52{\Omega}$ during 120 hours of operation. MPPT control strategy increased approximately 2.7 times of power production and power density (1.95 mW and $13.02mW/m^3$) compared to the initial values before application of MPPT (0.72 mW and $4.79mW/m^3$).

• 한국정보기술학회논문지
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• 제17권6호
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• pp.9-16
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• 2019

최근 제조 공정을 개선하려는 기업들은 스마트 팩토리를 도입, 이에 따른 도약이 특별히 눈에 띈다. 이는 최소한의 수동 제어를 통해 완벽하게 생산시설의 프로세스를 수행하는 스마트 팩토리의 영역을 최대화하고 추론의 오차를 최소화 하는 것이 최종 목적이다. 본 연구는 무인 생산, 관리, 포장, 배송 관리를 위한 프로젝트의 일부로써 무인생산의 자동화 설비의 철근 추적을 통해 롤러의 자동 교정을 수행하기 위해 철근 추적 시작점 검출에 대한 연구이며, 시작지점부터 끝점까지의 위치를 정확히 추적해야 하는 요구사항을 만족해야 한다. 추적성능을 높이기 위해서는 시작점 설정이 주요한데 기존의 시간 기반 검출방법을 통해서는 조도, 분진 등 환경에 따라 추적오류의 발생 확률이 높다. 본 논문에서는 환경에 따른 오차를 줄이기 위해 고속 IR카메라의 평균 밝기 변화를 이용한 시작점 검출 방법을 제안하며, 제안 사항을 통해 15%이상의 성능 향상을 확인하였다.

• 적정기술학회지
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• 제5권2호
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• pp.70-81
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• 2019

의류산업은 대표적인 노동집약적인 산업 중 하나로 의류 제조의 기본 공정인 봉제 작업은 인력에 대한 의존도가 매우 높다. 의류 생산비용은 라인의 효율성에서 큰 영향을 받는데, 생산비용의 절감을 위해서는 생산 속도를 조절하여 라인의 균형 유지하는 것이 중요하다. 그러나, 현재 의류 생산라인에서 활용되고 있는 인력에 의한 생산 실적 집계 방식은 이를 위한 부수적인 인력의 소요 등으로 인한 추가 비용이 소요되어 중소기업들이 직접 적용하기 쉽지 않다. 완제품의 인력에 대한 의존도는 집계 시간의 추가 소요와 인적 오류가 크게 잠재되어 생산비용의 증가와 함께 효율성의 저하를 초래할 수 있다. 본 논문에서는 에너지 소비 데이터를 수집하고 이를 CNN (Convolutional Neural Network) 기법을 적용하여 분석함으로써 재봉 작업을 통하여 생산한 제품의 수량을 추적하고 자동으로 집계할 수 있는 봉제 작업 생산 추적 시스템을 제안한다. 개발된 시스템을 통하여 2종의 재봉 작업을 테스트 한 결과, 최대 98.6 %의 정확도를 보이며 재봉 작업을 감지할 수 있었다. 개발도상국에서 의류봉제산업은 매우 중요한 산업이나, 위에 언급한 문제들을 해결하기 위하여 고가의 첨단기술을 적용하는 등 많은 자본을 투입하는 것은 크게 제한된다. 적정 기술을 적용한 본 기술은 이러한 개발도상국의 의류산업에 큰 도움을 줄 수 있을 것으로 판단된다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권6호
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• pp.3104-3120
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• 2017

The intelligent monitoring system has been successfully applied in many fields such as: monitoring of production lines, transportation, etc. Smart surveillance systems have been developed and proven effective in some specific areas such as monitoring of human activity, traffic, etc. Most of critical application monitoring systems involve object tracking as one of the key steps. However, task of tracking of moving object is not easy. In this paper, the authors propose a method to implement human object tracking in outdoor environment based on human features in shearlet domain. The proposed method uses shearlet transform which combines the human features with context-sensitiveness in order to improve the accuracy of human tracking. The proposed algorithm not only improves the edge accuracy, but also reduces wrong positions of the object between the frames. The authors validated the proposed method by calculating Euclidean distance and Mahalanobis distance values between centre of actual object and centre of tracked object, and it has been found that the proposed method gives better result than the other recent available methods.