• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1986.10a
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• pp.59-63
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• 1986

This paper presents a basic planning of CMDSS(Centrallized Maintenance Decision Support System)for future operation and maintenance of telecommunication network, the main components of CMDSS are MDB, MMB, DSDB, MDBMS, MMAMS, and IGMS. ANd the efficiency and the effectiveness depend on the adequate design of the decision procedure to assisy operation and maintenance persinnels.

• Journal of Electrical Engineering and Technology
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• v.11 no.2
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• pp.338-346
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• 2016

In order for the optimal solution of generators’ annual maintenance scheduling to be applicable to the actual power system it is crucial to incorporate the constraints related to the equivalent operation hours (EOHs) in the optimization model. However, most of the existing researches on the optimal maintenance scheduling are based on the assumption that the maintenances are to be performed periodically regardless of the operation hours. It is mainly because the computation time to calculate EOHs increases exponentially as the number of generators becomes larger. In this paper an efficient algorithm based on demand grouping method is proposed to calculate the approximate EOHs in an acceptable computation time. The method to calculate the approximate EOHs is incorporated into the optimization model for the maintenance scheduling with consideration on the EOHs of generators. The proposed method is successfully applied to the actual Korean power system and shows significant improvement when compared to the result of the maintenance scheduling algorithm without consideration on EOHs.

• KSBB Journal
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• v.13 no.3
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• pp.259-267
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• 1998

Optimal feeding strategies in bioreactor operation of Scutellaria baicalensis G. plant cell culture were investigated to maximize the production of flavone glycosides by using a structured kinetic model which can predict culture growth and flavone glycosides synthesis in a rigorous, quantitative manner. For the production of baicalin and wogonin-7-0-GA, the strategies for glucose feeding into Scutellaria baicalensis G. plant cell culture were proposed based on the model, which are a periodic fed-batch operation with maintenance of cell viability and of specific production rate respectively, and a perfusion operation with maintenance of specific production rate for baicalin and wogonin-7-0-GA. Simulation results showed that the highest volumetric concentration of flavone glycosides was obtained in a periodic fed-batch operation with maintenance of cell viability among all the suggested strategies. In the periodic fed-batch operations, the higher volumetric production of flavone glycosides was achieved compared with that in the perfusion operation. It can be concluded that a periodic fed-batch operation with maintenance of cell viability would be the optimal and practical operating strategy of Scutellaris baicalensis G. plant cell culture for the production of flavone glycosides.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.897-901
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• 2005

21 century as the knowledge information anger society now our society industry of all fields the rolling stock maintenance conservative standardization enterprise where information anger is being turning out construction Ministry of Transportation supported with continuous development of the supply section substitution quantity information processing system which the information highway is quick and the Korean railroad technical research worker propelled the enterprise as the subjective agency, it contracted this for a vehicle field information anger system construction in link of the enterprise our construction and an agreement, information technique composed the consortium t9day and it propelled a system codevelopment. The SMSC who is a front-runner of Maj loach city railroad operation agency to 'here business relates with a vehicle field maintenance conservativeness an immediacy operation and generally and information anger it will plan it will integrate it will own jointly and business efficiency and in the dictionary an obstacle occurrence electromotive car maintenance conservative information and it will improve only maintenance conservativeness of preventive maintenance of the electromotive car it knows it will prevent to construct the maintenance conservative system of the preventive maintenance, it applied the RIMS project to sleep.

• Journal of Information Technology Services
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• v.16 no.2
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• pp.45-60
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• 2017

The study suggests a contract model of application operation through case study of A bank's IT outsourcing application contract based on workload. The IT outsourcing order form has a problem in that the scope of work is ambiguous due to the integration of operation and maintenance. In this study, application operation and maintenance were separated by referring to application operation history provided in ISO/IEC15504-5 standard. The scope of the IT outsourcing service was clarified by organizing the definition and detail activities of the application operation business. Application operation contract method has generally applied estimation method by the number of input manpower and period by agreement between buyer and client. As there is no activity to calculate the number of input manpower based on the operational work history and based on the standard workload per activity. In this case is not guaranteed due to the simple agreement between the contractors. In this paper, we propose an application operating cost estimation model that measures the size of the operating software using function point analysis that is the basis of application operation tasks. In order to verify the validity of the application operation cost model, we verified the correlation between the application size and the labor cost through regression analysis using SPSS.

• Journal of Korean Society of Transportation
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• v.21 no.3
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• pp.23-35
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• 2003

This paper investigates the effectiveness of flight operation between airplane maintenance engineers and pilots who work together. The developed model is to identify the relationship between the attitudes of airplane maintenance engineers and pilots and the effectiveness of flight operation. The results indicate that the shared values and balanced power between airplane maintenance engineers and pilots are positively related with trust and job satisfaction, but conflict is negatively related. Further, trust and job satisfaction positively affect the effectiveness of flight operation. These findings suggest that the improvements of the relationships between airplane maintenance engineers and pilots need more efforts to ensure the aviation safety and efficient flights.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.881-895
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• 2011

Seoul Metro railway facilities' inspection and maintenance tasks cause failure analysis, but if there is trouble the diverse cause investigation and the systematic analysis and management among broken facilities, related facilities and components fell short and the conditions are different. And, excess and insufficiency, under inspection and maintenance, is being raised regardless of the introduction year and the operating environment including the number of use by applying the same facilities in the uniform inspection cycle. In this study, we will analysis systematically facility system information, failures, operational status, performance, fault and maintenance information resulting from the maintenance management of railway facilities and derive the relationship between associated equipment and its components. In addition, optimizing the inspection and the maintenance cycles of railway facilities, we will improve the reliability of operation. Considering the probability of risk, it is possible to predict the occurrence of accidents or faults and to minimize the frequency of breakdown by pre-inspection maintenance. Finally, This paper is to introduce the content of constructing the Seoul Metro RCM-based failure analysis system for railway facilities to support the optimal continuance of operation status of equipments and the securement of the safe operation of vehicles.

• Journal of the Korean Institute of Educational Facilities
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• v.16 no.1
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• pp.33-41
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• 2009

The purpose of this study is to provide a basis for calculation of school operation fees for normal functioning of the school facilities, and facility maintenance and repair cost through their life spans, considering remodeling of the facilities and changes of their functions. This study analyzes maintenance and repair records during the three years from 2003 to 2005 in primary, middle and high schools in Incheon Metropolitan city and also the facility management and operation expenditure of the same schools in the city during the year of 2005, and presents quantified unit cost of each item according to the area, the age of the facilities, and the number of classroom, student, and lessons given. The calculation can be a basis for both BTL school facility managers and the general school facility mangers to budget school facility maintenance cost appropriately and the quantity of energy, water, electricity, and telephone fees calculated here can be a criteria for the managers to check the normal maintenance of their facility.

• Journal of Communications and Networks
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• v.8 no.4
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• pp.480-484
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• 2006

This paper briefly reviews ITU-T recommendations associated with multi protocol label switch (MPLS) and Ethernet operation, administration, and maintenance (OAM). The broadband convergence network (BcN) architecture with a centralized network controller is introduced. An aggregation structure employing Ethernet, MPLS, and time division multiplexing (TDM) signal is presented for the BcN. A physical link failure scenario is examined to investigate how the maintenance signal is propagated between different layers.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.702-707
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• 2008

BTL projects for educational facilities were conceived in 2005 to supply public facilities in a timely and efficient manner After the projects were completed in March 2007, proper facility maintenance has become an increasingly important issue. However, BTL projects are still in an early developmental stage, and the data on the maintenance and operation of such facilities are not yet available because the operation of the facilities has just begun. Accordingly, this study is conducted to derive maintenance processes and to specify maintenance items for the efficient maintenance of BTL educational facilities. Then, database on the maintenance processes will be created, and a maintenance system module will be designed.