• The Journal of the Korea Contents Association
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• v.16 no.10
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• pp.758-765
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• 2016

This study analyzed for the radioactive shielding wall, which shields the medical linear accelerator. This allows to evaluate the level of waste with respect to the shield wall, which accounts for more than half of the cost of dismantling later linac facility. In addition, by analyzing the waste processing method according we discuss the way to obtain the benefits in terms of dismantling cost. Results of the simulate, the amount sufficient to screen the amount of neutron radiation occurring in the shielding wall linac was measured. And neutron activation analysis results were analyzed nuclides more than about 20. This analysis was in excess of that, $^{24}Na$, $^{45}Ca$, $^{59}Fe$ nucleus paper deregulation concentration. The value is reduced is greater the deeper the depth of the shielding wall concentration. Based on this, three specific areas (E, F, G) was estimated to be impossible to landfill or recycling. The rest area was estimated to be buried or recycled if possible more than a predetermined depth.

• Resources Recycling
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• v.18 no.2
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• pp.62-68
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• 2009

Number of vehicles in Korea is gradually increasing and it exceeded 16 million in 2007. Holding of vehicles is connected to disposal, owing to this reason the importance of ELVs recycling has been emphasized. The recycling of ELVs makes the disposal of ELVs easier as well as protects environment and it has the alternative effect economizing the insufficient resource. This study was carried out to evaluate the economic effect of recycling of ELVs compared with disposal of ELVs. The analysis showed that recycling process makes a profit in comparison to the disposal of ELVs. Therefore the government has to consider establishing the regulation related to recycling of ELVs or materials and car manufactures have to develop the efficient dismantling and recycling methods.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.119-124
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• 2005

순로구분 자동화 시스템이 상용화를 앞두게 됨에 따라 실제 순로구분기의 운영계획을 비롯한 자동화 방안 등에 대한 연구가 활발히 진행되고 있다. 또한 순로구분기의 유형의 결정과 운영 방식을 고려한 자동화 효과를 분석하여 실제로 어느 정도의 경제적 효익이 발생할 수 있는가에 대한 청사진이 제시되어야 할 필요성이 있다. 그러나, 이제까지 순로구분의 자동화와 순로구분 시스템의 효율적인 운영을 위한 사업의 타당한 당위성이나 최적의 사업 및 운영에 대한 목표 등의 구체적인 모델링이 없었으며, 이러한 모델링을 위한 분석체계가 미흡했던 것이 사실이다. 이에 본 연구는 순로구분의 자동화 효과에 대한 경제성을 인건비 절감을 통하여 분석하고, 우편물량과 순로구분기 유형, 운영 일정에 대한 시나리오를 설정하여 각각 소요되는 자동화 비용을 분석하고, 현재의 수작업 순로구분에 비하여 경제적인 이득이 얼마나 발생하는가에 대하여 분석한다. 본 연구는 학술적으로는 순로구분 자동화라는 새로운 시스템이 도입됨에 따라 설정되는 정성적인 변수들을 계량화하여 이를 경제성 분석에 반영함으로써 상호 배타적인 투자안에 대한 결론을 도출하려고 노력하였다. 또한 우편업무 개선을 위한 실무적 측면에서는 순로구분기의 도입과 시스템이 실제로 상용화되는 과정에 따라 구체화되는 여러 요인에 따라서 요구되는 의사결정을 위한 기초 자료로써 활용될 수 있다.

• Journal of Advanced Navigation Technology
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• v.15 no.2
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• pp.313-318
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• 2011

Virtualization has recently come under the spotlight as an important emerging technology. The technology was initially focused on services rather than the effective use of the system when it was developed in the 1960s. Now, following with technological advancement, virtualization is used on servers based on x86. The biggest merit by far of this technology is economic. Virtualization enables server integration, which can cut operating expenses (including personnel expenses) since it costs less to purchase, power and maintain multiple servers if they are integrated by the virtualization technology. This study examines the trend of virtualization technology and suggests a roadmap for future server integration.

• Journal of Korea Water Resources Association
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• v.43 no.8
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• pp.681-694
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• 2010

In this study, methodology to determine optimal location of washlands based on economic analysis is presented. Install costs of washlands are calculated by construction cost and land compensatory cost and benefits of washlands are calculated from flood damage reduction and befit from using washland as wetland. Indirect approach for runoff-flood damage relationship is suggested and benefit-cost analysis is used for economic analysis. Economic analysis is added to existing models that used only flood reduction effect to determine optimal location of washlands. Suggested methodology is applied to 13 potential washlands in Anseong River basin to examine its applicability. Applied result of new methodology is compared with that of existing model. As the application results, it is possible to determine the optimal combinations of washlands can provide more economic benefit compared to existing studies. It is determined that considering economic analysis can be better option for decision making problem searching for optimal location of washlands.

• Review of KIISC
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• v.26 no.3
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• pp.45-49
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• 2016

게임은 독자적인 하나의 가상 세계를 구성하며, 이에 따라 게임을 서비스하는 기업은 별도의 사법체계에 가까운 정보보호 및 보안 체계 및 인력을 유지하는 경우도 많다. 여기에서는 이러한 기업이 가지고 있는 권한을 활용하여 정보보호를 강화하는 방법에 대해 경제이론에 기반하여 사례를 간략하게 분석하였다. 가상 세계에서의 불법적 활동은 개인의 효용극대화라는 경제이론으로도 설명이 가능하며, 이를 볼 때 불법적 활동의 감소는 기대되는 수익의 감소 및 처벌 규모 및 발각확률 상승으로 인한 기대되는 비용의 증가를 통해 정책적으로 대처가 가능하다. 이를 위해 다양한 기술적/보안조직 등에 대한 연구 및 방법론들이 개발되어 있지만, 이를 통하지 않더라도 게임 내 규칙을 변경하거나, 정책적 방향을 통해서도 유사한 효과를 얻을 수 있다. 여기에서는 간략하게 (1) 불법적 이득을 감소시키는 정책 (2) 불법적 활동의 발각확률을 올리는 정책 (3) 불법적 활동에 대한 처벌에 대한 정책이라는 세 가지 측면에서 검토하였으며, 그동안 게임사에서 시도되었고 효과적이었다고 인지되는 여러 사례를 소개하고자 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.440-444
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• 2007

센서 네트워크를 구성하는 각 노드는 AA형 건전지를 사용하여 2년 6개월 이상 동작하는 것을 목표로 하며, 따라서 저전력을 고려하여 설계되어야 한다. 본 논문에서는 저전력 센서 네트워크를 위한 분산 컴퓨팅 모델을 제안한다. 제안된 모델은 우선 센서 노드에서 처리를 위한 에너지 소비와 통신을 위한 에너지 소비의 크기를 분석한다. 그리고 처리 에너지 비용을 지불하여 통신 에너지 감소라는 이득을 얻을 수 있음을 보인다. 한편, 이 기법은 특정 센서 노드의 에너지를 집중적으로 소비할 수 있음을 보이고, 이를 해결할 수 있는 에너지 균형 분산 컴퓨팅 모델을 제안한다. 시뮬레이션 기반 실험 결과 제안된 모델이 전체적인 에너지 소비를 낮추었을 뿐 아니라 센서 노드들 간에 에너지 균형도 이루고 있음을 알 수 있었다.

• Journal of the Korea Computer Industry Society
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• v.8 no.4
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• pp.245-252
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• 2007

This treatise wishes to estimate internet performance using PLC(Power Line Communication) instead of use existing exclusive line. Hard problem of many communication network mountings and work does solution low class informer with power line simply. If use net by power line with this, can get into enormous gains in side of early expense as well as hard problem of work. This treatise investigated validity about if investigate using power line what level internet utilization can take advantage of, and can activate internet by hereafter first term.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.12
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• pp.83-89
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• 2009

The environment of electrical power industry is now faced on problems such as electric rates, an increasing sensitivity in society with environmental issues and energy factors. Up to now, reliability is greatly influenced by maintenance and environmental factors that are unique to the electric utilities. The reliability is a characteristic assigned to the electric power systems's function which is related to the concept of installment of equipment. Therefore this reports's key finding is that it is important that the utilities track their individual components' value over investment expense of their installed components. This can be accomplished to consider the cases of foreign electric power companies and take into account the various possible installment ways of equipment in Korea. These results are expected to be used as a reference material for design underground distribution facilities and future applications.

• Journal of KIISE:Computer Systems and Theory
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• v.27 no.6
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• pp.583-591
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• 2000

Caching mechanisms have been studied extensively to buffer the speed gap of hierarchical storages in the context of cache memory, paging system, and buffer management system. As the wide-area distributed environments such as the WWW extend broadly, caching of remote objects becomes more and more important. In the wide-area distributed environments, the cost and the benefit of caching an object is not uniform due to the location of the object; which should be considered in the cache replacement algorithms. For online operation, the time complexity of the replacement algorithm should not be excessive. To date, most replacement algorithms for the wide-area distributed environments do not meet both the non-uniformity of objects and the time complexity constraint. This paper proposes a replacement algorithm which considers the non-uniformity of objects properly; it also allows for an efficient implementation. Trace-driven simulations show that proposed algorithm outperforms existing replacement algorithms.