• Journal of Radiation Protection and Research
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• v.25 no.2
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• pp.89-96
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• 2000

Nuclear fuel cycle choices and costs are important in considering energy policies, fuel diversity, security of supply and associated social and environmental impacts. Particularly, the nuclear spent fuel is very important in view of high activity and the need of long term management. This study focuses on the comparison of reprocessing and direct disposal of nuclear spent fuel in terms of cost, safety and public acceptability. The results of the study show that the direct disposal is about 7% more economical than the reprocessing. In terms of safety, the results show that the risk of vitrified HLW (high-level radioactive waste) is less than directly disposed spent fuel. For the public acceptability, both of the methods are not well understood and therefore they are not accepted. In conclusion, it is necessary to guarantee the safety of the both spent fuel processing methods through continuous development of associated technology and to have a fuel cycle policy which should consider not only the economics but also social and environmental impacts.

• Journal of Korean Society of Transportation
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• v.14 no.3
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• pp.173-190
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• 1996

본 논문에서는 최근 차량의 급격한 증가로 인해 더욱 더 가중되고 있는 도시내 교 통혼잡 완화를 위한 하나의 현실적 대안으로 무선 호출망을 이용한 ATIS (첨단 교통정보시 스템)의 구체적 구현방안을 제시하였다. ATIS를 위한 통신매체로서 무선 호출망을 사용하는 것은 다음과 같은 잇점을 갖는다. (1) 교통정보의 동시전송 가능 및 이를 통한 무선채널의 경제성 제고, (2) 간단한 망접속 절차 및 송수신의 안정성, (3) 하드웨어 및 통신비용의 저 렴, 시스템 구현 및 시험을 위해 무선 호출망을 이용한 교통정보 전송 프로토콜 및 시험용 전자지도를 개발하였으며, 이의 실용화를 위한 교통정보 서버 및 무선 호출망을 이용한 교 통정보 전송 프로토콜 및 시험용 전자지도를 개발하였으며, 이의 실용화를 위한 교통정보 서버 및 무선 호출망과 연동되는 차량내 교통정보 단말장치를 개발 중에 있다. 실현 가능성 시험을 위한 PROTOTYPE 시스템을 개발하였으며, 이를 이용해 시험적인 실제 무선 호출망 을 통해 가상 교통정보 송수신 시험을 하여 만족할만한 결과를 얻었다. 또한, 향후, 시스템 의 지능화를 위해서 교통사건에 의한 교통량변화 모델링을 위한 기본적인 사항들을 연구, 이에 관해 기술하였다. 제안 시스템의 성능 개선 및 지능화, 실제 적용을 위해 계속적인 연 구를 진행 중에 있으며, 이를 통해 미비점이 좀 더 보완되면 기존 무선 통신망을 이용한 ATIS 구현의 좋은 사례가 될 것으로 사료된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.4284-4290
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• 2015

Recently, due to a decline in traditional industrial function and recession of the real estate business, urban coastal settlement areas have been promoted in a regeneration way using historical cultural values rather than overall development approach. This study investigated the regional assets of water-front area around Yeongdodaegyo Bridge in Yeongdo-gu, Busan and classified them into physical social economic assets and then, presented the integrated regeneration approach that can increase the place value of this area. First, physical regeneration proposed a regional revitalization plan by considering place and cultural characteristics and second, social regeneration by considering the regional brand through storytelling and third, economic regeneration by considering historical cultural characteristics. Regional assets-based culture experience can be provided by building cultural tourism infrastructure through this and local economy and local community activation can be expected by providing urban vitality base of coastal settlement areas.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.628-629
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• 2011

E-commerce is a kind of trade type between buyers and sellers rely on computer networks. Carried out according to certain standards of various business activities. e-commerce is based on modern information technology and network technology, financial electronic collection, management, information technology, business and trade information networks into one, aimed at logistics, capital flow and information flow of harmony and unity of the new trade, trade activities of the entire process, electronic, networking and digital. E-commerce has brought to the traditional ways of trading a huge impact, led to changes in economic structures, is a business revolution in the way and is recognized internationally as the 21st century is an important driver of economic development compared to current traditional companies. In this material, we first consider the current problem, analyze particular characteristics of clothing shopping mall to increase the purchasing power of customer. For these reasons, we describe the process for building the clothing site.

• Journal of Korean Society of Disaster and Security
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• v.11 no.1
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• pp.1-5
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• 2018

Power plant is the important infrastructure to generate electricity. This plant in normally located next to river and seashore in order to take cooling water through intake. However, the plant is stopped when marine organism blocks the intake, and it caused damages by social and commercial. Therefore, air bubble barrier has been used to block marine organism in order to operate the plant properly. The aim of this study was to test the rates of cut off of floating substance by air bubble barrier to develop the facility for the plant. The test was conducted by current velocity, pressure of air, specific gravity of the substance and the layer of the barrier, and the result showed the blocking rates by the condition. It will be used as basic data to develop the air bubble barrier and to operate power plant properly from the marine organism.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.1316-1320
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• 2004

생활수준의 향상과 기술발전에 따라 상수도 관망시스템에 관할 관점 또한 기존의 설계 및 해석의 개념에서 안정적이고 효율적인 용수공급 운영의 측면으로 변화하고 있다. 본 연구에 서는 상수도 시스템을 효율적으로 운영하기 위한 방법을 관망운영의 측면에서 모색하였으며, 수도권 광역상수도를 대상으로 하여 시범 적용하였다. 본 연구는 현재 시점에서 안정적인 용수공급이 가능한 가능최소 에너지 비용을 구하는 것이 목적이다 용수수요량의 변화 등 운영여건이 바뀌게 되면, 수리적 안정성이 확보되는 범위내에서 가능한 최적의 펌프운영패턴을 도출하였다. 현재 용수공급량 변동시 또는 연계운영 방법의 변경시와 같은 운영여건 변동에 따른 경제적운영 방안 등에 대한 연구가 미비하여 가장 최적의 운영방안 도출이 어려운 실정이므로, 본 연구를 통하여 연계운영에 최적화 기법의 적용 및 운영방안의 도출을 수행하였다. 운영여건의 변경시 펌프장 등에서의 전력원단위 변화 등 각 단계별 수도시설의 종합적 고려를 통한 경제적 운영방안을 검토할 수 있는 상수관망 최적운영모형의 실제 탑재 모델을 개발하였으며, 이를 기반으로 하여 실제 현장에서 담당자가 쉽게 사용할 수 있는 사용자 편의 환경을 개발하였다.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2600-2602
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• 2003

오늘날의 사회는 디지털 기술기반에 의해 가속화되는 새로운 사회적, 경제적 경험의 세계로 움직이고 있다. 그 결과로서, 과거 어느 때 보다도 전력시스템, 인터넷, 통신망 등 복잡하고, 상호작용적인 네트워크의 원활한 기능에 전적으로 의존되어 가고 있고, 이러한 상황은 네트워크에 전례 없는 품질과 안정성을 부각시켰다. 또한 디지털 기기의 확산과 디지털 산업의 성장에 따른 고품질의 전력요구, 전력수급의 유형 변화, 소비자 생활양식의 변모 등에 의해 과거와는 다른 새로운 전력 시스템을 요구하고 있다. 이를 위해서는 Electricity Network와 IT Network와의 결합을 바탕으로 다단계의 지능적인 제어 능력을 보유한 전력 Super Highway가 필요하다. 본 논문은 디지털 시대를 대비한 해외의 신 전력시스템 개발 현황 및 이를 뒷받침하기 위한 네트워크 구축 방안들을 살펴보고, 이를 통해 현재 우리나라의 전력시스템 환경에서 필요한 요구조건과 가능한 네트워크 구축 방안에 대하여 살펴본다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.21 no.1
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• pp.61-77
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• 2019

If a new utility tunnel is planned for high density existing urban areas in Korea, a rational decision-making process such as the determination of optimum design capacity by using the feasibility evaluation system based on quantitative evaluation indexes and the economic evaluation is needed. Thus, the previous study presented the important weight of individual higher-level indexes (3 items) and sub-indexes (16 items) through a hierarchy analysis (AHP) for quantitative evaluation index items, considering the characteristics of each urban type. In addition, an economic evaluation method was proposed considering 10 benefit items and 8 cost items by adding 3 new items, including the effects of traffic accidents, noise reduction and socio-economic losses, to the existing items for the benefit cost analysis suitable for urban utility tunnels. This study presented a quantitative feasibility evaluation method using the important weight of 16 sub-index items such as the road management sector, public facilities sector and urban environment sector. Afterwards, the results of quantitative feasibility and economic evaluation were compared and analyzed in 123 main road sections of the Seoul. In addition, a comprehensive evaluation method was proposed by the combination of the two evaluation results. The design capacity optimization program, which will be developed by programming the logic of the quantitative feasibility and economic evaluation system presented in this study, will be utilized in the planning and design phases of urban community zones and will ultimately contribute to the vitalization of urban utility tunnels.

• Current Industrial and Technological Trends in Aerospace
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• v.8 no.2
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• pp.86-97
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• 2010

This paper treats with the history and current trends in the developments of liquid-propellant rocket engine in Russia and Ukraine which are among world leaders in the technology of liquid rocket engine(LRE). In 1960s formerly the Soviet Union accepted the closed cycle engine for increasing the pressure in the combustion chamber and specific impulse to the maximum. However, since financially difficult times after 1990, they have decreased the cost for the development of new rocket engines. It was achieved by using existing units for new developed engines and minimizing the total number of engines and tests through the reasonable planning in the process for the experimental improvement of LRE. In addition, nowadays international cooperation in supplying LRE for commercial rocket and development of next generation LRE, such as 3 components engines and mathane engines, are proceeding.

• Korean Journal of Soil Science and Fertilizer
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• v.38 no.4
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• pp.218-221
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• 2005

The present study was investigated in the Chittagong hill forest of Bangladesh to assess the feasibility of ginger cultivation under multipurpose forest and fruit tree species. There were three treatments such as i) ginger grown under open field condition, ie. full sunlight (T1), ii) ginger grown under Gamar tree (spacing of $90{\times}90cm$ (T2) and iii) ginger grown under guava tree (spacing $180{\times}180cm$) tree (T3). The experiment was laid out in randomized block design (RBD) and each treatment was replicated three times. From data it was observed that some morphological parameters of ginger such as plant height, number of leaves per plant, leaf length and leaf breadth were higher in the treatments T2 and T3 as compared to the treatment T1. A positive and linear relationship was observed between the weight of rhizome and yield of ginger which caused the highest yield of ginger ($23.63Mg\;ha^{-1}$) under guava tree species at partial shaded condition in the T3 treatment ($180{\times}180cm$), whereas the lowest yield ($15.64Mg\;ha^{-1}$) was recorded in the T2 treatment when ginger was cultivated under Gamar tree species at closer spacing ($90{\times}90cm$). Therefore, it was revealed that partial shaded condition favoured the optimum growth and yield of ginger, whereas the dense shade from intensively planted tree species badly affected the dry matter production and yield of ginger.