• 한국기계가공학회지
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• 제12권6호
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• pp.132-141
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• 2013

Robotic Drilling Systems(RDSs) set the standard for the factory automation systems in aerospace manufacturing. With the benefits of cost effective drilling and predictive maintenance, RDSs can provide greater flexibility in the manufacturing process. The system can be easily adopted to manage very complex and time-consuming processes, such as automated fastening hole drilling processes of large aircraft sections, where it would be difficult accomplished by workers following teaching or conventional guided methods. However, in order to build an RDS based on a CAD model, the precise calibration of the Tool Center Point(TCP) must be performed in order to define the relationships between the fastening-hole target and the End Effector(EEF). Based on the kinematics principle, the robot manipulator requires a new method to correct the 3D errors between the CAD model of the reference coordinate system and the actual measurements. The system can be called as a successful system if following conditions can be met; a. seamless integration of the industrial robot controller and the IO Level communication, b. performing pre-defined drilling procedures automatically. This study focuses on implementing a new technology called iGPS into the fastening-hole-drilling process, which is a critical process in aircraft manufacturing. The proposed system exhibits better than 100-micron 3D accuracy under the predefined working space. Based on the proposed EEF fastening-hole machining process, the corresponding processes and programs are developed, and its feasibility is studied.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.391-393
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• 2005

Automatic guided vehicle(AGV) in the factory has an important role to advance the flexible manufacturing system. In this paper, we propose a novel object-transportation control algorithm of cooperative AGV systems to apply decentralized control scheme based on virtual-passivity. It is shown that the cooperative AGV systems ensure stability and the convergence to scaled multiple of each desired velocity field for multiple AGV systems. Finally, the application of proposed virtual passivity-based decentralized control algorithm via system augmentation is applied to be the tracking a circle. Also. the simulation results for the object-transportation by two AGV systems illustrate the validity of the proposed control scheme.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권6호
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• pp.261-263
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• 2006

Automatic guided vehicle(AGV) in the factory has an important role to advance the flexible manufacturing system. In this paper, we propose a novel object-transportation control algorithm of cooperative AGV systems to apply decentralized control scheme based on virtual-passivity. It is shown that the cooperative AGV systems ensure stability and the convergence to scaled multiple of each desired velocity field for multiple AGV systems. Finally, the application of p reposed virtual passivity-based decentralized control algorithm via system augmentation is applied to be the tracking a circle. Also, the simulation results for the object-transportation by two AGV systems illustrate the validity of the proposed control scheme.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2313-2318
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• 2003

By means of flexible forming processes in sheet metal manufacturing it is possible to produce parts of complex geometry within short manufacturing time. These procedures are suitable especially for prototyping or adjustment of deformation. Here formative procedures like laser forming are increasingly important, because they make the large-scale-like production of the prototypes with the required materials possible. High accuracy and reproducibility of the products is the precondition of the production. Due to the lack of a forming tool, complex geometries can hardly be manufactured within tolerances. To overcome this problem an automatic closed loop control system for the adjustment of deformations has been developed. An important element of the closed loop control system is the definition of a suitable irradiation strategy for laser forming. For the determination of the irradiation strategy a lot of influences must be taken into consideration from the field of material, geometry and laser. In this paper the improved closed loop control system and the development of an irradiation strategy for 4 mm deep buckles in an ALMgSi1 sheet will be represented. This system can be used e.g. in the automated adjustment of hail damage in car bodies or deformation by heat treatment.

• 제어로봇시스템학회논문지
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• 제9권12호
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• pp.1055-1064
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• 2003

In many automated systems, such as manufacturing systems and process plants, a fieldbus is a very important component for the exchange of various and sometimes crucial information. Some of the information has a tendency to rapidly lose its value as time elapses after its creation. Such information or data is called real-time data that includes sensor values and control commands. In order to deliver these data in time, the fieldbus network should be tailored to have short delay with respect to the individual time limit of various data. Fine-tuning the network for a given traffic requires the knowledge on the relationship between the protocol parameters such as timer values and the performance measure such as network delay. This paper presents a mathematical performance model to calculate communication delays of the Profibus-FMS network when the timer value and the traffic characteristics are given.

• 지능정보연구
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• 제11권1호
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• pp.35-51
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• 2005

인터넷의 보급과 전자상거래 관련기술의 발달은 기존의 상거래 방식에 많은 변화를 가져왔으며, 전자상거래 환경에서도 실세계의 거래방식을 구현하기 위한 시도가 잇따르고 있다. 협상은 기존 상거래에서 정찰제 거래를 제외한 대부분의 거래 시 수행되고 있는 거래방식으로써, 협상의 기능을 전자상거래 환경에서도 구현하고자 하는 연구가 시도되고 있다. 본 연구는 전자상거래 환경에서 자동협상시스템 구현을 위한 다속성 협상안을 생성하고 평가하는 방법론에 대한 내용을 설명하고 있다. 본 연구에서는 주문제조 생산 환경에서 일어나는 협상을 대상으로 협상의 항목이 둘 이상인 다속성 협상문제을 정의하고 이의 해결 방법론을 연구하고자 한다. 이를 위해 판매자는 자신의 협상안 생성을 위해 제품생산 일정계획과 가격을 고려한 협상안을 생성하고 구매자가 제시한 협상안은 다속성 의사결정(Multi Attribute Decision Making MADM) 기법 중 단순 가중합법(Simple Additive Weighting Method : SAW)을 이용하여 평가하게 된다.

• 한국산업정보학회논문지
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• 제4권2호
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• pp.62-72
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• 1999

본 논문에서는 자동창고시스템과 자재취급시스템이 통합된 통합자동생산시스템의 하나인 DIO가공시스템을 고려한다. DIO가공시스템에서는 스태커크레인이 가공물의 저장을 위한 운반은 물론 각 기계 사이의 가공물 운반역할을 담당하게 된다. 이러한 시스템에서 일어날 수 있는 문제로 크게 시스템 설계와 관련된 문제와 시스템운영과 관련된 문제로 구분하고 본 논문에서는 시스템의 운영정책에 관련된 문제만을 다룬다. 시스템의 운영과 관련된 문제로는 가공물투입순서, 가공물의 저장위치, 스태커크레인의 작업배정, 가공물선택 등으로 크게 4가지로 나누어서 고려한다. 각각의 운영정책에 대해서 기존의 연구결과로부터 DIO가공시스템의 특성을 반영하는 몇 가지씩의 운영정책을 대안으로 제시하고 최적의 운영정책 결정을 위한 방법론으로 컴퓨터시뮬레이션과 유전자알고리즘을 통합한 방법론을 제시한다. 또한 실험을 통해서 기존의 연구결과와 비교 검토함으로서 제시된 알고리즘의 우수성을 검증한다.

• Industrial Engineering and Management Systems
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• 제4권1호
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• pp.47-53
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• 2005

The efficiency of fabrication (fab) operation is one of the key factors in order for a semiconductor manufacturing company to stay competitive. Optimization of manpower and forecasting manpower needs in a modern fab is an essential part of the future strategic planing and a very important to the operational efficiency. As the semiconductor manufacturing technology has entered the 8-inch wafer era, the complexity of fab operation increases with the increase of wafer size. The wafer handling method has evolved from manual mode in 6-inch wafer fab to semi-automated or fully automated factory in 8-inch and 12-inch wafer fab. The distribution of manpower requirement in each specialty varied as the trend of fab operation goes for downsizing manpower with automation and outsourcing maintenance work. This paper is to study the specialty distribution of manpower from the requirement in a typical 6-inch, 8-inch to 12-inch wafer fab. The human resource planning in today’s fab operation shall consider many factors, which include the stability of technical talents. This empirical study mainly focuses on the human resource planning, the manpower distribution of specialty structure and the forecast model of internal demand/supply in current semiconductor manufacturing company. Considering the market fluctuation with the demand of varied products and the advance in process technology, the study is to design a headcount forecast model based on current manpower planning for direct labour (DL) and indirect labour (IDL) in Taiwan’s fab. The model can be used to forecast the future manpower requirement on each specialty for the strategic planning of human resource to serve the development of the industry.

• 품질경영학회지
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• 제18권2호
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• pp.93-99
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• 1990

This paper considers the selection of process plans for a flexible manufacturing machine. Most of the planning models for the automated manufacturing systems are based on the assumption that for each part there is only one process plan available. This paper considers that for each part a number of different process plans are available, each of which may require specific types of tools. If the requisite tools are not on the machine, one or more tool switches must occur before the process plan can be processed. This paper develops an optimal algorithm of branch and bound method for the selection of process plans to minimize the number of tool switches.

• 한국기계가공학회지
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• 제12권3호
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• pp.61-68
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• 2013

Automatic measurement system is required since cycle time and cost of production are increased by various factors in manual systems. This paper presents a machine vision based prototype measurement system for the automotive axisymmetric shape parts which are generally measured by a manual system that is required the tolerance of the part is very small on each machined surface. This measurement system adopts a method in which optical lens is transferred along the profile of the part to minimize measurement cycle time. The main interest of this paper is a development of an optimum measurement algorithm to the outside diameter of the parts that can be applied to various combinations of hardware. The operating system used to implement the whole system is Window XP and corresponding environment.