• Journal of Korean Society of Industrial and Systems Engineering
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• v.11 no.17
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• pp.39-46
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• 1988

This Paper is concerned with a man-multi machine assignment problem to minimize idle time. Assuming different types of semi-automatic machines with deterministic service-processing time, the problem approaches by sequential dependent one operator can handle several machines, where determine optimal range the cost of idle labor and machine time is to be minimized in preparing a work schedule. The Procedure, to establish man-machine assignment model, and it's results are: (1) Objective function to minimize opportunity loss cost, which is happened by idle time, is verified recursive process through heuristic method. (2) The algorithm, is programmed by BASIC language for personal computer, and a numerical example is given to illustrate the heuristic algorithm. This study will be helpful to enhance productivity of Shopflooras a result of increasing the efficiencies of both operator and machine.

• Journal of the Korean Society for Railway
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• v.8 no.6 s.31
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• pp.602-609
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• 2005

In this paper, we consider the train-fleet assignment problem to determine fleet assignment and seat allocation synchronously. An integer programming model of the problem and a decomposition-based solution approach are developed to handle short-term period deterministic orgin-destination demands. The primary objective used in the developed model is to maximize the total number of passengers transported during peak load periods, such as Chuseok national holiday period. Thus, in developing the model we choose to profit-pursuing system. We also show how the proposed model can be readily modified to incorporate profit-maximization. Using the empirical data sets provided by a Korean railroad company, we have tested the proposed solution approach and carried out various comparison analyses by varying traffic demand patterns and train schedules. The computational experiments reveal that the proposed solutions approach produces high quality solutions in reasonable computation time.

• Journal of Institute of Control, Robotics and Systems
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• v.8 no.11
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• pp.963-969
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• 2002

Design method of a robust impedance control is proposed for the kinematically redundant manipulators. To achieve this objective, we first use the momentum feedback disturbance observer(MFDOB) scheme which can handle the nonlinear dynamics of a manipulator in Joint space. An extended task space formulation to describe the behaviors of task and null spaces of redundant manipulator is employed. Using the extended task space formulation and disturbance observer scheme, a robust impedance control method is designed. The performance of the proposed extended impedance controller is verified through experiments with a planar three links direct-drive manipulator.

• Journal of the Semiconductor & Display Technology
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• v.7 no.2
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• pp.55-58
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• 2008

The objective of the research is to design, manufacture and test a Mass Flow Controller(MFC) capable of measuring compressible fluid flows based on a "bucket and stop-watch"method. The basic principle is the measurement of time, where the time taken to fill and empty a bucket of known volume is measured. This method of flow measurement is a new concept when compared to a commercilized current mass flow controller. For the flow meter to be able to compete with established designs it not only must be comparable in cost and robustness, it must be very accurate and reliable as well. This device should be able to handle fluid flows in the range of 0.1ml/min to 10ml/min within an accuracy of ${\pm}$1%. A possible application for a device such as this is in electronics industry where arsenic gas is used in the production of silicon chips.

• Journal of the Korean housing association
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• v.15 no.3
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• pp.63-72
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• 2004

The objective of this study is to survey and analyze convenience of the disabled people to use the facilities in accommodations. The data used in this research has been obtained in the southern sea of Korea. According to the survey, it was very difficult for the disabled people with a wheel chair to access to the room because of the staircase, doorsill and the narrowed passage. Also, there was no the grab bar, braille blocks and exclusive elevators for the disabled. Moreover, it was not easy for them to access to the bedroom since there was a doorsill and a serious height difference between the lobby and the bedroom. It was shown that the disabled People also have a difficulty in using the toilet and the bathroom, because the width of door and floor height was not suitable for the design criteria. In the toilet, there was no handle on a chamber pot for the disabled people to hold, and the space was not enough for them to access to the pot and turn with a wheel chair.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1993.06a
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• pp.1370-1373
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• 1993

In controlling a system having many variables to control and multi objectives to satisfy such as a roof crane system, it is often difficult to obtain fuzzy If-Then rules in usual ways. As an alternative, we can more easely obtain rules in such a manner that we obtain each independent group of rules using partial variables for a partial objective. In this case, obtained rules can be conflicting with each other and conventional inference methods cannot handle such rules effectively. In this paper, we propose a roof crane controller with optimal velocity profile generator and a fuzzy logic controller with an inference method suitable for such conflicting rules.

• Journal of the Korean Society of Safety
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• v.28 no.1
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• pp.109-116
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• 2013

The objective of this study is to develop a new system that is simpler to be used to keep the safe workplace at the small food manufacturers which employees less than 10 persons. The number of these small food manufacturers is 13,853 and account for almost 80% of all food manufacturers. Most of these companies do not pay attention to safety and thus keep high accident potential. It is very important to persuade these companies to manage safety but they can hardly handle the complicated requirements of safety, health, quality, food quality, and musculoskeletal disorders intervention. This system is intended to develop a system which can be easily implemented but comprehensive to reflect main points in safety management, musculoskeletal disorders intervention,. ISO 9001, ISO 14001, KOSHA 18001, GAP and ISO 22000.

• Journal of Korean Institute of Industrial Engineers
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• v.24 no.3
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• pp.431-446
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• 1998

In this paper, we consider the problem of scheduling n jobs with sequence-dependent processing times on a set of parallel-identical machines. The processing time of each job consists of a pure processing time and a sequence-dependent setup time. The objective is to maximize the total remaining machine available time which can be used for other tasks. For the problem, we first propose a dynamic programming(DP) algorithm for sequencing jobs processed on a single machine. The algorithm is then extended to handle jobs on parallel-identical machines. Finally, we developed an improved version of the algorithm which generates optimal solutions using much smaller amount of memory space and computing time. Computational results are provided to illustrate the performance of the DP algorithms.

• Industrial Engineering and Management Systems
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• v.9 no.2
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• pp.178-194
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• 2010

To improve the ship operation in automated container terminals, it is important to schedule different types of handling equipment to operate synchronously. For example, a vehicle with container receiving and lifting capabilities is used to transport containers from a storage yard to a vessel and vice versa, while a triple quay crane (QC) can handle up to three 40-ft containers simultaneously. This paper discusses the manner in which vehicles should be assigned to containers to support such multi-lifts of QCs by using information about the locations and times of deliveries. A mixed-integer programming model is introduced to optimally assign delivery tasks to vehicles. This model considers the constraint imposed by the limited buffer space under each QC. A procedure for converting buffer-space constraints into time window constraints and a heuristic algorithmfor overcoming the excessive computational time required for solving the mathematical model are suggested. A numerical experiment is conducted to compare the objective values and computational times of the heuristic algorithm with those of the optimizing method to evaluate the performance of the heuristic algorithm.

• Journal of Industrial Convergence
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• v.4 no.1
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• pp.87-107
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• 2006

Foodservice industry serves enormous volumes of food each day, yet they rely on what might be the most poorly educated, most transient, and youngest work force in the whole food industry. These individuals handle every meal or item which is served. It is a situation ripe for problems, problems which are all too real. HACCP system is a preventive approach stages where loss of control could present a food safety risk in a food service operation. But it is very difficult to using HACCP Plan. The objective of this study was to develop a HACCP Plan using Six Sigma Methodology. This new HACCP Model from this study will be left to the each operation to develop for themselves. This means that foodservice industry operations should modify new HACCP Model provided in this study to establish their own HACCP system for use in their own operations.