• Ocean and Polar Research
• /
• v.26 no.2
• /
• pp.187-197
• /
• 2004

The purpose of this paper is to investigate economic feasibility of manganese nodules in Korea area (Clarion-Clipperton Fracture Zone). We assumed that the production scale of manganese nodules were 3.0MT or 1.5MT and analyzed that the capital cost and operating cost were estimated in the four sectors, exploration, mining, transportation and metallurgical process. The capital cost and operating cost evaluation reflects the latest technical practices. First, for analyzing economic feasibility, the scenario suggests that the production of 4 metals can be made for 25 years. Assuming the discount rate at 8.0%, equity capital at 50% and tax at 27%. When manganese nodule were mininged 3.0 MT, economic feasibility analyses showed that IRR was 12.8 and pay-back period was 9.2 years, and when manganese nodules were mininged 1.5 MT, economic feasibility analyses showed that IRR was 4.0 and pay-back period was 11.8 years. This study indicated there is economic validity of at the product of manganese nodules 3.0 MT. In addition, we carried out a sensitivity analysis at the change of cobalt price on mining 1.5 MT. The result of sensitivity analysis clearly showed that economic validity is high at increasing of cobalt price 50% up.

• Korean Journal of Social Welfare
• /
• v.47
• /
• pp.107-147
• /
• 2001

In the 1990s, with enacting of the laws on the family violence in Korea, agencies such as helpline 1366, counseling center and shelter for the female victims have been rapidly increasing in number. Also police and medical center have been viewed as having major responsibility for delivering services and social workers in community welfare center and public social worker have been expected play a role in community-based delivery systems for the female victims. The purpose of this study is to measure the level of the inter agency coordination and to find out the factors affecting the inter-agency coordination in family violence and to make policy implications for a better delivery system. The data were obtained from a social survey of family violence agencies, counselling center/shelter/helpline 1366, police, medical center, social workers of community center and of public sector in Seoul and Kyeongi area. The major results are as follows: 1) the level of inter-agency coordination is low, specially the referal cases of police and medical center is very poor. 2) The type of inter-agency coordination is referals and information sharing among agencies. 3) the factors affecting inter-agency coordination is agency type, wills and efforts of agency, information sharing, experience of family violence education. The current findings suggest that the delivery system to promote inter-agency coordination efforts and for police and medical center, social worker in private and public agency to respond promptly and properly would be built up.

• Industrial Engineering and Management Systems
• /
• v.14 no.2
• /
• pp.129-158
• /
• 2015

It is necessary for retailers to determine the optimal ordering policy of products considering supply disruptions due to a natural disaster and a production process failure as quality and machine breakdowns. Under the situation, a dualsourcing supply chain (DSSC) is one of effective SC for retailers to order products reliably. This paper proposes the optimal ordering policy of a product in a DSSC with a retailer and two manufacturers. Two manufacturers may face supply disruptions due to a natural disater and a production process failure after they received the retailer's order of products. Here, two scenarios of demand information of products are assumed: (i) the demand distribution is known (ii) mean and variance of the demand are known. Under above situations, two types of DSSC are discussed. Under a decentralized DSSC (DSC), a retailer determines the optimal ordering policy to maximize his/her total expected profit. Under the integrated DSSC (ISC), the optimal ordering policy is determined to maximize the whole system's total expected profit. Numerical analysis investigates how demand information and supply disruptions affect the optimal decisions under DSC and ISC. Besides, profitability of supply chain coordination adjusting the wholesale price is evaluated to encourage the optimal decision under ISC.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2005.05a
• /
• pp.1124-1128
• /
• 2005

In this paper, a plan-coordination architecture is proposed for multi-agent control in the fractal manufacturing system (FrMS). A fractal in FrMS is a set of distributed agents whose goal can be achieved through cooperation, coordination, and negotiation with other agents. Since each agent in the FrMS generates, achieves, and modifies its own plan fragments autonomously during the coordination process with other agents, it is necessary to develop a systematic methodology for the achievement of global plan in the manufacturing system. The heterarchical structure of the FrMS provides a compromised plan-coordination approach, it compromise a centralized plan-generation/execution (which mainly focuses on the maximization of throughput) with a distributed one (which focuses on the autonomy of each module and flexibility of the whole system). Plan-coordinators in lower level fractal independently generate plan fragments according to the global plan of higher level fractal, and plan-coordinators in higher level fractal mediate/coordinate the plan fragments to enhance the global performance of the system. This paper assumes that generation method of the plan fragments and the negotiation policy of the fractal is achieved by a simple process, and we mainly focuses on the information exchanging and distributed decision making process to coordinate the combinations of plan fragments within a limited exchange of information.

• Journal of Korean Society of Transportation
• /
• v.11 no.1
• /
• pp.87-103
• /
• 1993

The subject this paper is the signal control strategy under oversaturated conditions. The nature of traffic control for oversaturation is essentially different from the standard control modes. While under non-saturated situation traffic control is needed for the sake of safety and efficiency, the throughput is essential under oversaturated conditions. Therefore berth objective and strategies differ. For an oversaturated stream the cycle time and the signal offset are thought to be of rather secondary importance. For this case the green split may well be the most important control variable to serve the excessive demand. Up to now, however, most efforts have concentrated on the strategy with the concept which lies just on the extension of Webster's. "Green-split Coordination Strategy for Over-Saturated Networks", presents newly contrived three types of strategies named Forward-coordination, Backward-coordination and Network-coordination respectively and describes the algorithms with the evaluations. The forward coordination strategy treats the forward wave of flow between two signals. The aim is to prevent the outbreak of queue due to the accumulation of temporary excess of demand in near-saturation or saturation flow. The backward coordination strategy treats the backward rave of flow between two signals. The goal is to prevent the waste of green time caused by the exit block at the upstream signal. for this purpose a feedback regulation is provided of the upstream green-split so that the inflow-outflow balance is kept zero. The resultant surplus of green time is alloted to other signal stages. Also here the examination is made of the appropriate value of the feedback control parameter. The network coordination strategy is operated to maximize the network throughput in a specific direction applying a bang-bang control at the bottleneck intersection. This is a type of intervenient control for policy reasons. For this strategy the green-split coordinations, particuarly the backward coordination, are essential as the tactical elements. In order to evaluate the preposed strategies those are compared with the latest existing strategy called saturation-degree-ratio control by the simulation experiments in an assumed 4$\times$4 grid network. The results are satisfactory showing a 10-15% reduction in delays and a 15% increase in network capacity.

• Construction Engineering and Management
• /
• v.16 no.6
• /
• pp.41-44
• /
• 2015

• Current Industrial and Technological Trends in Aerospace
• /
• v.7 no.1
• /
• pp.23-31
• /
• 2009

Insufficient problem about resource of satellite network frequency and orbit was seriously issued, because commercialization of a satellite has been successfully achieved since 1980s. Therefore, each countries execute an advantageous policy to them for guarantying and protecting satellite network resource and perform study for preoccupying new satellite network resource. Understanding and insight of policy about occupying satellite network resource of world each countries are landmark of satellite network task. In this paper, policies of Japan, Russia and China located around Korea are especially described. Also, in this paper, the administration organization of Japan, Russia and China which are to manage satellite network is described. The KARI(Korea Aerospace Research Institute) secured satellite network frequency and orbit of the KOMPSAT(KOrea Multi Purpose SATellite)-1 and the KOMPSAT-2 and is also going to register satellite network of the KOMPSAT-3 and the KOMPSAT-5. When satellite network coordination with nearby three countries will be needed, understanding of political policy and organization let the Korea acquire coordination agreement of the other administration.

• Journal of Fisheries and Marine Sciences Education
• /
• v.23 no.3
• /
• pp.433-444
• /
• 2011

The purpose of this study is to examine the task of the policy on the collecting cargoes of the Japanese container ports. Although the ports of Asia countries such as China, South Korea have increased the amount of cargoes dramatically since the latter half of 1990s, the amount of cargoes Japanese container ports deal with have increased within narrow limits. As a result of this trend, the position of Japanese ports as hub-ports has been falling down. The times of main liners linked with North America and Europe stopping at Japanese ports have continued to decrease. So Japan container ports need the policy to increase the amount of cargoes in order to avoid becoming feeder ports. This policy is to collect domestic cargoes which are transshipped in Asia ports such as Busan port from Japanese regional ports to core ports. By collecting domestic cargoes to Japanese core ports intensively, the times of international main liners stopping at Japanese core ports will increase. It's important to support the domestic liners linking between Japanese regional ports and core ports in order to collecting domestic cargoes to Japanese core ports effectively. In addition the role of Japanese government to achieve the coordination between Japanese regional ports and core ports is indispensable.

• Journal of Science and Technology Studies
• /
• v.8 no.1
• /
• pp.29-54
• /
• 2008

This is to review the reform of the governance for science and technology advanced by the Noh Moo Hyun government. The reform mainly included introducing the vice premiership for science and technology, strengthening the coordinative function of the National Science and Technology Committee over the public R&D budget and programs, and establishing the Office of Science and Technology Innovation under the vice premier for science and technology. The reform aims to improve not only the policy coordinative mechanism but policy discourse mechanism over the enhanced science and technology policy. This paper argues that Noh Moo Hyun Government's reform of the governance for science and technology was not successful. The reason is that the reform targeted mainly to improve the policy coordination among government departments concerning science and technology policy. But it was nearly neglected to make effective the policy discourse mechanism linking the state actors and societal actors.

• Journal of Korea Technology Innovation Society
• /
• v.4 no.3
• /
• pp.255-274
• /
• 2001

This study aims to provide information about the priority setting and budget coordination of government R&D spendings in Korea. Based on the result of "Survey, Analysis and Evaluation of National R&D Programs"in FY 2000. this paper reviews the government R&D expenditures by the concerned variables such as program objectives, sector of performance, character of work and technology fields. It is found that R&D spendings on the areas of industrial development, information technology, and development research are funded pretty high. Also, it turns out that, considering program objectives and character of work, there are some redundancies of R&D programs among government agencies. Policy implications are suggested.