• Journal of Internet Computing and Services
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• v.12 no.3
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• pp.101-110
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• 2011

WMN is highlighted as a next generation network technology due to relatively reasonable cost to be built, compared with the pre-existing wireless network. It also enables same kind of network or even other kind of network to be integrated. Some WMN researches support mobility using router protocol such as AODV and DSR because WMN has the similar features with Ad-hoc network in terms of operation. However, WMN has got different operations with additional functions of multi-interface and internet connect, it can't be a good method to manage efficient mobility any more. This study suggests method to apply MAP function of HMIPv6 to WMN as a way to manage WMN mobility. Through simulation, operation was verified and function was appreciated. Through the results of evaluation, the suggest mobility management had shorter handover delay and packet loss reduced, which improved whole network throughput rate, compared with mobility management using AODV.

• Journal of the Korean Operations Research and Management Science Society
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• v.26 no.2
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• pp.99-109
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• 2001

In this study, we tried to build a model which can deal with the efficient and effective operation of electric power industry, especially focused on the nuclear industry. Here, SD (System Dynamics) approach is used to visualize the underlying phenomenon of the nuclear power industry. SD is a methodology for studying and managing complex feedback systems, such as one finds in business and other social systems. The spend of SD applications has grown extensively and now encompasses work in corporate planning and policy design, public management and policy, biological and medical modeling, energy and the environment. Recently, according to the report from KEPCO (Korea Electric Power Corporation), they are considering delaying a new power plant construction. It may be based upon business fluctuation downsized from Korean economic crisis in 1997 and freezing of construction funds due to unstable foreign exchange rate. At this point, we need disparately a kind of strategic model that would contribute to cope with the current business situation, energy generation, production, and resulting pollution. Specifically, this model, using SD approach, starts with the detailed drawing of influence diagram, which describes those relevant key points on nuclear power generation systems in electric power industry of Korea. These include such factors as the operation of nuclear industry and parameters related to the decision making for business policy. Based upon the above-mentioned influence diagram drawn, we developed SD simulation model to evaluate and analyze strategic management of KEPCO. Based on our analysis, we could demonstrate how simulation model can be applied to the real electric power generation in Korea.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.6
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• pp.1901-1910
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• 2014

Current domestic and overseas BIM practice and research efforts show very few examples that design and construction BIM data could be successfully used for efficient operation and maintenance (O&M) of infrastructure in particular. This study takes public wastewater treatment plant requiring an enhancement of operation and maintenance capability into account to develop a prototype BIM-based maintenance management system. The system is designed and implemented following a typical system development procedure and validated by the system outputs per four scenarios being considered to be main maintenance activities: The research results are expected to contribute to the upgrade of current wastewater treatment plant maintenance level, which is more demanded as water-related regulation and policy direction changes to region-based large scale O&M and asset management adoption, and overseas market participation.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.3
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• pp.459-464
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• 2023

The mobile house of this article is provided with stand-alone power system that uses photovoltaic energy and enables sensing and environmental monitoring. Excess power generated is stored in lithium batteries, which enable smooth operation of the mobile house even in environment in which solar energy cannot be used. The house has been designed that its systems can be operated continuously by diesel power generation even when photovoltaic energy cannot be generated due to long rainy season or heavy snow. BMS (batter management system) has been constructed for photovoltaic and power management, and monitors the charge/discharge and usage amount of photovoltaic energy. Various sensing data are recorded and transmitted automatically, and the design allows for wireless monitoring by means of computer and smartphone app. The container house proposed in this study enables efficient energy management by performing optimal energy operation in remote areas, parks, event venues, and construction sites where there is no system power source.

• Journal of the Korean Society for Railway
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• v.19 no.3
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• pp.397-407
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• 2016

This study analyzed the efficiency change and the factors affecting productivity change for the six railway operation corporations that are local public enterprises; study was performed with the DEA-CCR Model and Malmquist Productivity Index, using data collected from 2010 to 2014. Since it was not feasible to collect data on the operating expenses and the number of employees of each of the lines, the efficiencies of each operation corporation were analyzed by integrating the operation corporations, and the Malmquist Productivity Index was used to investigate the trend of the periodical productivity change. Average efficiency for urban railway operation corporations was found to be higher in the case of the bigger corporations. In 2014, the Seoul Metro and the Daejeon Metropolitan Express Transit Corporations were analyzed and found to be the most efficient operation corporations. The Malmquist Productivity Index was used to determine the periodical change; the average MPI was 1.06, with a continuous increase of productivity. The analysis showed that changes of technology were generally more obvious than change of technology efficiency for all six operation corporations.

• Journal of the Korean Society for Railway
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• v.10 no.6
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• pp.742-750
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• 2007

This paper presents a mathematical model for a double-fleet operation in Korean high speed rail (HSR). KORAIL has a plan to launch new HSR units in 2010, which are composed of 10 railcars. The double-fleet operation assigns a single-unit or two-unit fleet to a segment, accommodating demand fluctuation. The proposed model assumes stochastic demand and uses chance-constrained constraints to assure a preset service level. It can be used in the tactical planning stage of the rail management as it includes several real-world conditions, such as the capacities of the infra-structures and operational procedures. In the solution approach, the expected revenue in the objective function is linearized by using expected marginal revenue, and the chance-constrained constraints are linearized by assuming that demands are normally distributed. Subsequently, the model can be solved by a mixed-integer linear programming solver fur small size problems. The test results of the model applied to Friday morning train schedules for one month sample data from KTX operation in 2004 shows that the proposed model could be utilized to determine the effectiveness of double-fleet operation, which could significantly increase the expected profit and seat utilization rates when properly maneuvered.

• Journal of Korean Society for Quality Management
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• v.51 no.2
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• pp.263-282
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• 2023

Purpose: This study aimed to examine the impact of FSSC 22000 food safety management system characteristics on the business performance of food-related companies and to verify the mediating effect of organizational capabilities in the relationship between them. Methods: To achieve this, a survey was conducted among employees of food companies in Seoul and the metropolitan area that have implemented the FSSC 22000 food safety management system, and the following main results were derived. Results: First, the FSSC food safety management system factors, such as measurement/analysis and improve- ment, documentation, management responsibility, and service and product realization, were found to have a significant positive (+) impact on organizational capabilities. The relative impact was in the order of measurement/analysis and improvement, documentation, management responsibility, and service and product realization. Second, organizational capabilities were found to have a significant positive (+) impact on business performance. Third, the FSSC food safety management system factors, such as measurement/analysis and improvement, management responsibility, resource management, and documentation, were found to have a significant positive (+) impact on business performance. The relative impact was in the order of measure- ment/analysis and improvement, management responsibility, resource management, and documentation. Fourth, the factors of management responsibility, resource management, measurement/analysis and improvement, and documentation, excluding resource management factors, were found to have a positive impact on business performance through the mediation of organizational capabilities. Conclusion: The results of this study may provide important implications for the implementation and efficient operation and management of the FSSC 22000 food safety management system in enhancing the business performance of food-related companies.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.11a
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• pp.25-30
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• 2007

Most part of the energy consumption of MIC(Ministry of Information and Communication) is mainly due to operation/maintenance of the post office buildings. In this paper, the pattern of energy consumption & operating status in post office buildings in Korea is analyzed. The authors suggest integrated and grouped management of the dispersed post office buildings using internet, through which we can expect increased efficiency.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.164-171
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• 2005

기업은 날이 갈수록 심화되는 경쟁 환경에 대비하기 위해 많은 공급업체들과의 협력관계를 점차 강화해나가고 있다. 정보기술이 발전함에 따라 기업들은 SCM (Supply Chain Management)을 도입하여 이를 실현해나가고 있는 추세이다. 이에 따라, 공급사슬상의 관련 기업간의 상호작용과 정보공유에 기반한 공급사슬 통합이 추진되고 있으며, 정교한 관리를 위해 프로세스 간의 통합을 통해 하나의 글로벌 프로세스로서 SCM을 관리할 필요가 대두되고 있다. 이러한 관점에서 프로세스를 하나의 객체로서 관리하는 BPM (Business Process Management)을 활용하여 SCM을 체계적으로 관리할 필요가 있다. 그러나, 지금까지의 BPM은 비즈니스 프로세스의 자동화 및 통제 등에 주력해왔기 때문에, 전체 프로세스 관점에서 이를 효율적으로 실행하는 기능을 제공하지 못하고 있다. 따라서, BPM을 통해 SCM 프로세스를 단순히 자동화하여 실행한다면, 각 참여 업체들이 글로벌 프로세스의 관점에서 효율적으로 업무를 수행하기 어렵다. 본 논문에서는, 각 공급업체들이 전체 프로세스 관점에서 효율적으로 업무를 수행하는 방법을 제안한다. 제안한 방법을 통해 각 업체들은 전체 프로세스 내 관련 경로의 긴급도 및 관련 업무의 우선처리순위 정보를 제공 받을 수 있다. 따라서, 관련 정보를 토대로 각자의 업무를 수행하기만 하면, 글로벌 SCM 프로세스의 효율성을 향상시킬 수 있을 것이다.

• Journal of Applied Tourism Food and Beverage Management and Research
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• v.16 no.2
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• pp.17-31
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• 2005

Recently, hotel industry has realized the importance of food and beverage sales for the profit maximization, and the focuses on restaurant management has been growing. Accordingly, menu management in the F/B department is one of the most key factors determining the success or failure of business. Therefore, in this study, entree menu items of french restaurant in the deluxe hotel was analysed with presently theorized model of menu analysis, classified into four menu items. Also it was analyzed how those classified menu items influence on sales, number of sold, food cost percentage, contribution margin And, proper ways was presented to make restaurant managers and menu planner in order to increase food operation sales through proper modifications and methods on various menu analysis matrix. In Pavesic's menu analysis method, all of menu items have impact on the sales, number of sold, contribution margin and Primes, Sleepers do so on the food cost. The finding of this study was that Pavesic's menu analysis is superior to menu analysis in terms of the sales, number of sold, food cost percentage, contribution margin. Therefore, Pavesic's menu analysis is useful and efficient method in order to conduct menu engineering.