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역할 명세 인증서의 구조화에 의한 효율적 역할기반 접근제어 기법
양수미 ( Yang Soo Mi ) 한국인터넷정보학회 2005 인터넷정보학회논문지 Vol.6 No.5
속성 인증서를 이용한 역할기반 접근제어를 함에 있어서 역할 관리 비용을 줄이기 위해 역할 할당 인증서와 역할 명세 인증서를 활용하면 역할의 변경에 따른 갱신 오버헤드를 줄일 수 있다. 특히 유비쿼터스 컴퓨팅 환경과 같은 고도의 분산 컴퓨팅 환경에서는 광범위한 통제 구조를 가질 수 없으므로 이를 고려한 속성 인증서 관리 기법이 요구된다. 역할 명세 인증서를 따로 두는 경우 역할 관리 비용이 줄어드는 바, 더 나은 성능향상을 위하여 본 논문에서는 역할 명세를 구조화하여 효율적 역할기반 접근제어를 위한 속성 인증서 관리 기법을 모색한다. 역할을 그룹화하여 역할 명세 인증서의 관계구조 트리를 구성하여 분산된 환경에서 안전하고 효율적인 역할의 갱신과 분배를 달성한다. 규모 확장성을 위해 멀티캐스팅 패킷을 사용한 역할 명세 인증서 분배를 하며, 그에 따른 네트워크 상의 패킷 손실율을 고려한 성능분석을 하여 역할 그룹을 두어 역할 명세 인증서를 구조화하는 것이 성능을 향상시킴을 정량적으로 보인다. In a role based access control through attribute certificate, the use of role assignment certificates and role specification certificates can reduce management cost and the overhead incurred by changing roles. Highly distributed computing environments such as ubiquitous computing environments not having global or broad control, need another attribute certificate management technique. Actually just having role specification certificate separately reduce management cost. But for better performance we structure role specification. We group roles and make the role group relation tree. It results secure and efficient role renewing and distribution. For scalable role specification certificate distribution, the multicasting of packets is used. We take into account the packet loss and quantify performance enhancements of structuring role specification certificates.
양수석(Soo-Seok Yang),이대성(Dae-Sung Lee),김승우(Seung-Woo Kim) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
Currently under development is an airborne auxiliary power unit with 100 Kw equivalent power, which is composed of a centrifugal compressor, a reverse annular combustor, and a radial turbine. Air-foil bearings are used in this power unit to eliminate the oil supplying system, which can reduce the system complexity and weight. The high speed generator is adopted as an electric power generation and engine starting system, which can also eliminate the reduction gear system. Not only electric power but also pneumatic power is provided by bleeding the compressed air. This power unit is aimed for the multi-purpose use such as a primary power unit in the army weapon system, an auxiliary power and environmental control unit in a next-generation tank, and a smoke generating unit.
제(第)2종(種) 의료보험(醫療保險) 시범사업(示範事業) 현황(現況)과 문제점(問題点) 사업실적(事業實績)을 중심(中心)으로
양수석 ( Soo Sok Yang ) 한국보건사회연구원 1982 保健社會硏究 Vol.2 No.2
Despite of vigorous government efforts to improve the living standards of the people and current advancements in health care services, the scope and availability of outreach medical services are still limited. In addition, due to the rising cost of medical care and maldistribution of health personnel etc., the health care service has been led to an inbalanced phenomena. In particular, many problems on health care for the low-income families both in urban and rural areas remain unsolved. In order to solve the above problems,it is required that a financial mechanism for effectuate national health services has to be developed. Accordingly, the government intends to provide adequate health care delivery services through various means, such as the medical aid program and medical insurance etc. The Medical Insurance System was introduced with enacting of the Medical Insurance Law in 1963 however, it had been implemented in the form of demonstration project until 1976. Since then the government has made a great achievement for the system by initiating the Medical Insurance Programmes for industrial establishments with 500 workers and more since July 1977 in which year the Fourth Five-Year Economic Development Plan has been commenced. After that the insurance program has been gradually expanded in the country. As of the end of 1981, all workers in the enterprises with more than 100 employees, all government officials and all teaching staff of private schools which is 10,823,000 persons in total or 37.5% of the population are covered by the insurance. While,Class II Medical Insurance Scheme for rural people and self-employed persons, which had been rather neglected to develope, was invigorated by the implementation of demonstration programs in the three pilot areas from July 1981. The purpose of this paper is to analyze the 6 months performance of the demonstration program in three areas from 1st July to the end of December 1981 and make recommendations for the expansion of the project throughout the country. The recommendations are summarized as follows: 1)It is recommended that local medical insurance society should be operated directly by local government with necessary arrangements in manpower. 2)The method of premium collection should be changed from existing method into compulsory such as taxation etc. 3) If the operational system of the medical insurance society is alterable as above, the surplus budget gained from the expenditure curtailment among national subsidy could be used as the premium for the indigent people. 4) It is also emphasized that clinical functions of public sector health facilities must be strengthened to meet the increasing health needs. (Strengthening of medical personnels, equipments and facilities)
양수광(Soo Kwang Yang),송해은(Hae Eun Song),진혁(Hyuk Jin),강율호(Yul Ho Kang) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
The purpose of this study was to analyze the pressure drop characteristics according to the size, cell height, material, and air volume of the total heat exchange element, which is a key component of the heat recovery ventilation system, to establish data that can be applied when designing a ventilation system including a heat exchange element. As a result of comparing the pressure drop in the common flow range (150~350CMH) of heat exchange elements of different sizes, the pressure drop of the 250mm heat exchange element increased 43~81% compared to the 350mm heat exchange element. The 150mm heat exchange element increased by 200-450% compared to the 350mm heat exchange element.