• Nuclear Engineering and Technology
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• 제48권5호
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• pp.1059-1070
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• 2016

The Prototype Gen IV sodium cooled fast reactor (PGSFR) has been developed for the last 4 years, fulfilling the technology demonstration of the burning capability of transuranic elements included in light water reactor spent nuclear fuel. The PGSFR design has been focused on the robustness of safety systems by enhancing inherent safety characteristics of metal fuel and strengthening passive safety features using natural circulation and thermal expansion. The preliminary safety information document as a major outcome of the first design phase of PGSFR development was issued at the end of 2015. The project entered the second design phase at the beginning of 2016. This paper summarizes the overall structures, systems, and components of nuclear steam supply system and safety characteristics of the PGSFR. The research and development activities to demonstrate the safety performance are also briefly introduced in the paper.

• Journal of Nuclear Fuel Cycle and Waste Technology
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• 제1권1호
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• pp.9-27
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• 2013

Nagra was established in 1972 by the Swiss nuclear power plant operators and the Federal Government to implement permanent and safe disposal of all types of radioactive waste generated in Switzerland. The Swiss Nuclear Energy Act specifies that these shall be disposed of in deep geological repositories. A number of different geological formations and sites have been investigated to date and an extended database of geological characteristics as well as data and state-of-the-art methodologies required for the evaluation of the long-term safety of repository systems have been developed. The research, development, and demonstration activities are further supported by the two underground research facilities operating in Switzerland, the Grimsel Test Site and the Mont Terri Project, along with very active collaboration of Nagra with national and international partners. A new site selection process was approved by the Federal Government in 2008 and is ongoing. This process is driven by the long-term safety and feasibility of the geological repositories and is based on a step-wise decision-making approach with a strong participatory component from the affected communities and regions. In this paper a brief history and the current status of the Swiss radioactive waste management program are presented and special characteristics that may be useful beyond the Swiss program are highlighted and discussed.

• Journal of Nuclear Fuel Cycle and Waste Technology
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• 제1권1호
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• pp.29-35
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• 2013

The United States Department of Energy (US DOE) is conducting research and development (R&D) activities under the Used Fuel Disposition Campaign (UFDC) to support storage, transportation, and disposal of used nuclear fuel (UNF) and wastes generated by existing and future nuclear fuel cycles. R&D activities are ongoing at nine national laboratories, and are divided into storage, transportation and disposal. Storage R&D focuses on closing technical gaps related to extended storage of UNF. Transportation R&D focuses on ensuring transportability of UNF following extended storage, and addressing data gaps regarding nuclear fuel integrity, retrievability, and demonstration of subcriticality. Disposal R&D focuses on identifying geologic disposal options and addressing technical challenges for generic disposal concepts in mined repositories in salt, clay/shale, and granitic rocks, and deep borehole disposal. UFDC R&D goals include increasing confidence in the robustness of generic disposal concepts, reducing generic sources of uncertainty that may impact the viability of disposal concepts, and developing science and engineering tools to support the selection, characterization, and licensing of a repository. The US DOE has also initiated activities in the Nuclear Fuel Storage and Transportation (NFST) Planning Project to facilitate the development of an interim storage facility and to support transportation infrastructure in the near term.

• 대한간호학회지
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• 제31권4호
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• pp.619-630
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• 2001

Purpose: The purpose of this study was to analyze the differences in terms of services and cost between CVA without typical diseases (Group I), and CVA with typical diseases (Group II), in their Hospital-based home health care. Method: The subjects of this study were 308 CVA patients who used home care nursing during the second phase demonstration project of their hospital-based home health care. Results: The results of the study was as follows 1. Group II had more home visit (15.3/12.7) (p>0.05), and cases of death when home care (16.8/11.4) (p<0.05). 2. Group II needed more services than Group I such as bladder irrigation, skin care, bed sore care, glycerin enema, finger enema, lung care, urine sugar test, monitoring and surveillance of fluid infusion and R.O.M exercise (p<0.05). 3. The variables that showed statistical significance in the regression analysis were family style, OPD visit, level of consciousness, patient's state on termination of home care, and some extend of home health care services (R2=0.373, 0.205). Conclusion: Home nursing care needs to be planned by severity in Hospital-based home health care for CVA patients.

• 한국버섯학회지
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• 제11권3호
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• pp.177-180
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• 2013

본 사업은 2009년부터 2013년까지 추진 중인 버섯 국산품종 전국 조기 확대보급으로 2012년까지 느타리 등 19종 34품종의 국산품종을 전국 387개소에 보급하였으며, 이로 인해 인근농가 실증 확산 등 파급효과에 힘입어 국산품종 점유율을 30%('08)에서 45%('12) 수준으로 올랐다. 이러한 국산품종 조기보급 사업을 더욱 효율적인 추진을 위하여 중앙 및 각 지자체의 기술보급사업에 중점 반영하여 확대 추진할 것을 건의하였다.

• 한국인구학
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• 제4권1호
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• pp.23-35
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• 1981

Health policy is directed to equity in the provision of primary care for rural people before the year of 2, 000. This study aimed to define and identify the need for physician's care by using empirical data, and suggested an alternative of the primary care delivery system in rural areas to the government. 1. Twenty percent of the study population wanted to obtain any form of medical care services. : 9.3 percent of the population was in need for physician's care; 15 percent of the need was met by physicians, while 85 percent remained unmet at the time of survey in 1979. 2. For meeting all the need for physician's primary care, 2.9 annual physician visits per capita are demanded. An alternative, which was devised in some favourable way at reasonable cost in rural settings, was suggested. It was to deploy the physician extender such as community health practitioner in the infrastructure of the health care delivery system, whose supervision is provided by physician, based on experience of the KHDI health demonstration project. 3. One physician, two community health practitioners and two community health aides should be assigned in distant locations for meeting all the estimated need for physician's primary care for 10, 000 rural underserved residents.

• 한국수소및신에너지학회논문집
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• 제26권5호
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• pp.484-492
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• 2015

As our government is actively introducing the RPS (Renewable Portfolio Standards) as a national renewable energy obligation policy, power producers are using the various renewable energy to meet the RPS supply quota since 2012. Recently, it is appling to use power bio-fuel oil in bio-fuel oil demonstration project with power companies. In general, power bio-fuel oils are composed of mixture products of vegetable oil, animal fat, fatty acid ester and waste oil. It is already developing for a power plant as a renewable energy abroad. In Korea, it is studying a 100% combustion and blended combustion of heavy fuel oil and bio-fuel oil. In this study, we investigated fuel characteristics of mixed power bio-fuel oil and its emission performance. Especially, it was reduced emissions of bio-oil in industrial boilers due to bio-fuel properties as compare with fuel oil.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1525-1538
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• 2008

Currently, it has been a fashion to include RAMS of rolling stock in the order for purchasing the rolling stock. However, it's only to suggest a qualitative value or an ideal target without giving or demonstrating actual RAMS target, with only demonstrating passive RAMS by the data provided by the manufacturer. In the case of KTX project of 100 cars of KTX-II contracted in June 2006, their target has been suggested from the previous RAMS application standard and it aimed to achieve the reliability level of equivalent high speed rolling stock. Afterward, as actual KTX-II RAMS Plan and RAMS Demonstration Plan has been prepared and approved, it has been the first problem to secure the reliability and safety in order to introduce the new high speed rolling stock(KTX-II) successfully and we actually tried to apply overseas RAMS standard, KTX samples, electric railcar MTRC and rolling stock samples. This Report was dealt world trends of Railway RAMS standard, KTX-II RAMS Specifications, the present condition of KTX-II RAMS performance and development a way of KTX-II RAMS, We hope the "KTX-II RAMS Application Standard for Safety of Passenger Transportation Service" is served as an opportunity for the basic research for establishing and demonstrating RAMS target of components or parts composing the rolling stock system.

• 정보보호학회논문지
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• 제12권6호
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• pp.29-46
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• 2002

인증을 지원하고 비밀통신 설정을 위한 안전한 수단을 제공하기 위해 보편적으로 이용하고 있는 것이 X.509 v3 인증서를 이용하는 SSL/TLS 프로토콜이다. X.509 PKI는 아주 복잡하고도 불완전하기 때문에 이를 보완하기 위한 연구의 결과로 SPKI/SDSI가 탄생하였다. 본 논문은 기존의 Geronimo 프로젝트로 구현된 SPKI/SDSI 서버가 지니지 못한 비밀통신과 역할기반 접근제어 기능을 수행하는 보안모듈들을 추가하고, 온라인으로 이름&권한-인증서를 전담해 발행하는 이름&권한 위임 모듈을 탑재한 보안서버를 설계하며 그의 프로토타입을 구현함이 목적이다. 그리고 이 프로토타입의 구현이 웹상에서 어떻게 적용되는지를 실제 예를 통해 보였다.

• Geomechanics and Engineering
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• 제29권5호
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• pp.523-533
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• 2022

Several prediction model of penetration rate (PR) of tunnel boring machines (TBMs) have been focused on applying to design stage. In construction stage, however, the expected PR and its trends are changed during tunneling owing to TBM excavation skills and the gap between the investigated and actual geological conditions. Monitoring the PR during tunneling is crucial to rescheduling the excavation plan in real-time. This study proposes a sequential prediction method applicable in the construction stage. Geological and TBM operating data are collected from Gunpo cable tunnel in Korea, and preprocessed through normalization and augmentation. The results show that the sequential prediction for 1 ring unit prediction distance (UPD) is R²≥0.79; whereas, a one-step prediction is R²≤0.30. In modeling algorithm, a gradient boosted regression tree (GBRT) outperformed a least square-based linear regression in sequential prediction method. For practical use, a simple equation between the R² and UPD is proposed. When UPD increases R² decreases exponentially; In particular, UPD at R²=0.60 is calculated as 28 rings using the equation. Such a time interval will provide enough time for decision-making. Evidently, the UPD can be adjusted depending on other project and the R² value targeted by an operator. Therefore, a calculation process for the equation between the R² and UPD is addressed.