• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.1169-1172
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• 2002

This paper presents the development of an expert system for monitoring and control of an oil production facility. The objectives of developing an expert system for the oil production facility are to monitor the Important processing parameters in different sections of the facilities and to control battery operations in real time. By providing consistent, fast, and reliable decision support to operators, the expert system can be used for automated monitoring and control of a petroleum production facility located south of Regina in Saskatchewan, Canada. The system was implemented in Visual Basic 6.0.

• Industrial Engineering and Management Systems
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• v.3 no.1
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• pp.1-11
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• 2004

This paper proposes a new algorithm for determining an optimal control input for production systems. In many production systems, completion time should be planned within the due dates by taking into account precedence constraints and processing times. To solve this problem, the max-plus algebra is an effective approach. The max-plus algebra is an algebraic system in which the max operation is addition and the plus operation is multiplication, and similar operation rules to conventional algebra are followed. Utilizing the max-plus algebra, constraints of the system are expressed in an analogous way to the state-space description in modern control theory. Nevertheless, the formulation of a system is currently performed manually, which is very inefficient when applied to practical systems. Hence, in this paper, we propose a new algorithm for deriving a state-space description and determining an optimal control input with several constraint matrices and parameter vectors. Furthermore, the effectiveness of this proposed algorithm is verified through execution examples.

• IE interfaces
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• v.19 no.1
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• pp.34-42
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• 2006

This paper presents a scheme for a hierarchical production scheduling and control system for a refrigerator factory with mixed model assembly lines. The setting of the factory is as follows. There are three mixed-model assembly lines called main line A, B and C and two batch lines that supply parts to the main lines. For each of the main lines, three work-centers are dedicated to them. The sub-lines and work-centers produce parts in batch type. An incoming production order from the master planner is characterized by its product type, amount, and due date. Under this situation, the proposed scheme has several features to schedule and control the above mentioned factory; 1) select the starting time and the place (assembly line) for an order processing, 2) devise a way to control orders to be processed as scheduled, and 3) reschedule orders when something unexpected happen. Finally, this paper provides a case study where the proposed scheme is applied to.

• The Korean Journal of Pharmacology
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• v.17 no.2
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• pp.75-78
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• 1981

The effects of Panax ginseng and Acanthopanax on egg production of hens are studied. The hens are fed with three dose levels of ethnaol extract of Panax ginseng and Acanthopanax for 24 months. The weight of each egg and number of egg production per month were compared between control group and treated group. The average weight of egg was not influenced by treatment of Panax ginseng and Acanthopanax. The number of egg production in control group was markedly decreased during cold season (from November to March). Panax ginseng and Acanthopanax markedly improve the egg production during cold season compared with control group.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.4
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• pp.938-945
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• 2007

For middle & small sized metal heat treatment companies in Korea, this paper is crucial to have a systematic way of collecting and storing field data, and extracting relevant information when necessary. Therefore, it is concerned with developing a metal heat treatment program system for production technique control which is mainly focused on processing heat treatment filed data, converting the data into meaningful production technique control information, and illustrating a case study of a middle & small sized company in Busan province. Consequently, we are implemented a production information system for metal heat treatment a middle & small sized type company.

• IE interfaces
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• v.16 no.1
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• pp.111-116
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• 2003

Business integration has been considered as one of the most critical success factors that enable the firms to gain competitive edges. Despite this trend, it has also been found among not a few companies that the activities that should be functionally tied with are performed even independently. In this study, an integrated model of production planning and inventory has been developed. Computerization of the production planning activities is proposed and implemented. We also proposed the reasonable inventory levels of each item using historic data of the items, which are composed of safety stock from the given fill-rate, operating stock from the production patterns, and reserved stock from the production planning. This study has helped the firm to have clearer job definition of the related processes, to tightly control the inventory by setting and tracing the reasonable fill rates for every product, and to quickly respond to the market changes through the computerized production planning process.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1211-1214
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• 1992

AC servo motor drives, Fara DS series, proposed in this paper can be effectively used in robots, CNC machine tools, and FA system with AC servo motors as actuators. The inverter of the AC servo drive consists of IGBT (Insulated Gate Bipolar Transistor) which have high switching frequency. Noises and vibrations generated in variable speed control of AC servo motors can be greatly reduced due to their high switching frequencies. In the developed servo drive, maximum torque is always generated in the whole speed range by compensating phase shift, which results from the nonlinearies of the AC servo motor during abrupt acceleration and deceleration. Abundant protection functions are provided to prevent abnormal state of the servo motor, and furthermore diverse user options are considered provided for the effective application. The proposed AC servo motor drive is designed to minimize velocity variation with respect to external load, supply voltage, environmental temperature, and humidity, so can be widely used in the fields of factory automation including robots and CNC msachine tools.

• Microbiology and Biotechnology Letters
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• v.21 no.6
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• pp.549-555
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• 1993

The production of cellulase by Pseudomonas sp. LBC505 isolated was under the strict genetic and biochemical control mechanisms such as catabolit repression and induction. These biochemical control reduced cellulase production. Thus LBC505 was mutated to increase enzyme yields. Cells growth and cellulase production were inhibited by the addition of 2-deoxy glucose (2-DG), which is presumed to function as repressor for the selection of high cellulase yielding mutant.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10a
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• pp.806-810
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• 1992

Some concepts and methods for information system as a part of CIM system in ship production are proposed in this paper. The characteristics and problems focused on product design and production planning and control are analyzed. A conceptual framework for CIM in ship production is presented, which is focused on a product model for information system. A methodology for the practical use of information for each managerial class is also presented.

• Journal of Physiology & Pathology in Korean Medicine
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• v.21 no.3
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• pp.611-616
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• 2007

The study was designed to investigate the effects of Leonuri herba extract (LHE) on the change of regional cerebral blood flow (rCBT and cytokines production (IL-1${\beta}$, TNF-${\alpha}$, IL-10, TGF-${\beta}$) in ischemic rats. The results were as follows : The rCBF was significantly and stably increased by LHE (10 mg/kg, i.p.) during the period of cerebral reperfusion, which contrasted with the findings of rapid and marked increase in control group. In cytokine production of serum by drawing from femoral arterial blood at 1 hr after middle cerebral arterial occlusion, experimental group (LHE 10 mg/kg treated group) was significantly decreased IL-l${\beta}$ production, and increased TGF-${\beta}$ production compared with control group. In cytokine production of serum by drawing from femoral arterial blood at 1 hr after reperfusion, experimental group was significantly decreased IL-1${\beta}$ production compared with control group. IL-10 and TGF-${\beta}$ production of sample group were significantly increased compared with control group. These results suggested that LHE was significantly and stably increased regional cerebral blood flow by inhibited IL-1${\beta}$ production, and accelerated IL-10 and TGF-${\beta}$ production.