• 기술사
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• 제44권3호
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• pp.25-29
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• 2011

The fuel cell, a renewable energy facility, hasn t come into wide use to the public. However, the usefulness of it is so high through Supply Business called Green Home, general auxiliary Supply Business, obligation to supply renewable energy for public organizations, Building Certification System and compulsory quota of using renewable energy to power generating businesses, etc. Intial installation was supported by government and a local autonomous entities in case of home fuel cell. Cost-benefits of installing it in home are approximately from $1,000 to $2,500. As Korea applies a progressive tax scheme in home electricity, energy costs are associated with electricity consumption. We should contemplate ways to make effective use of additional waste heat because technology of fuel cell is kind of a cogeneration.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2007년도 춘계 학술대회논문집
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• pp.14-16
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• 2007

A critical problem in the integration of stores into new and existing aircraft is the safe separation of the stores from the aircraft at a variety of flight conditions representative of the aircraft flight regime. Typically, the certification of a particular store/aircraft/flight condition combination is accomplished by a flight test. Flight tests are very expensive and do expose the pilot and aircraft to a certain amount of risk. Wind tunnel testing, although less expensive than flight testing, is still expensive. Computational Fluid Dynamics(CFD) has held out the promise of alleviating expensive and risk by simulating weapons separation computationally. The forces and moments on a store at carriage and at various points in the flow field of te aircraft can be computed using CFD applied to the full aircraft and store geometry. This study needs full dynamic characteristics study and flow analysis for securing store separation safety. Present study performs dynamic simulation of store separation with flow analysis using Chimera grid scheme which is usually used for moving simulations.

• 마이크로전자및패키징학회지
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• 제19권1호
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• pp.25-32
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• 2012

Package for artificial satellite is to produce mass production for high package with reliability certification as well as develop SDRAM (synchronous dynamic RAM) module which has such as miniaturization, mass storage, and high reliability in space environment. It requires sophisticated technology with chip stacking or package stacking in order to increase up to 4Gbits or more for mass storage with space technology. To make it better, we should secure suitable processes by doing design, manufacture, and debugging. Pin type PCB substrate was then applied to QFP-Pin type 3D memory package fabrication. These results show that the 3D memory package for artificial satellite scheme is a promising candidate for the realization of our own domestic technologies.

• 디지털융복합연구
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• 제1권1호
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• pp.69-91
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• 2003

The purpose of this paper is to provide several considerations to be taken into account when institutionalizing the information security(Infosec) pre-assessment. Infosec pre-assessment is a necessary process to embed the security requirements into the information systems at the early stages in their development, resulting in more cost-effective infosec. In order to provide some institutional issues, domestic infosec assessment schemes and U.S. Infosec certification and accreditation schemes are reviewed. Also, the current status of infosec implementation in the public information systems projects is analyzed. Based on the analyses, the seven suggestions are proposed in developing and performing the infosec pre-assessment scheme.

• 보건교육건강증진학회지
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• 제27권2호
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• pp.59-67
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• 2010

Objectives: As nationally qualified health education specialists were produced for the first time in 2010, there is a need to suggest opinions on its quality management by examining university curriculum for health education specialist and its education system and this is the main topic of paper. Results and conclusion: The results are as follows. First, it requires to provide a high-quality education continuously by introducing the certification system for universities which offer health education. Secondly, education content needs to be based on skill for health education specialist and more standardized curriculum should be developed. Thirdly, introduction of validity date for the health education specialist qualification is needed. Fourthly, it is desirable to introduce the academic credit bank system after effectively organizing the management system. Lastly, follow-up course for health education specialist needs to be introduced.

• 한국초등과학교육학회지:초등과학교육
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• 제18권1호
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• pp.29-39
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• 1999

The purpose of this investigation was to examine and compare pre-service and in-service elementary school teachers' beliefs about Science-Technology-and Society (STS), particularly beliefs about the nature of science and technology, their interaction within society, and the epistemology of science. Large percentage of pre-service and in-service elementary school teachers were understood to perceive as follows : 1. they regarded the science as 〃Knowledge scheme aiming content'and technology as 'skill for solution of actual problems'. 2. they revealed themselves to perceive tat science/ technology influence our lives through new terms and ideas, that science/ technology is affected by governmental policies and that all the people concerned including scientist and technologist should participate in the course of decision making. 3. they perceived that scientist perform their studies by characteristic abilities and that the studies are affected by their religious viewpoint. Moreover, they were understood to perceive that scientific knowledge are constructed through social interaction. 4. they perceived that scientist discover and develop scientific laws by scientific methods such as verification and certification, and that those scientific laws could be changed later.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.329-330
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• 2012

The rising popularity of renewable energy sources resulted in development of the units of higher rated powers, where the large-scale plants and grid-connected type solar power systems are increased. Therefore, the importance of grid stabilization, which depends on each country or system-type, has been strengthened by different grid-codes or certifications. In this paper, the control scheme of three-phase photovoltaic system is enhanced, where both injected active and reactive powers are simultaneously controlled with the consideration of the certification of the Germany Association of Energy and Water Industries (BDEW). Experimental results are shown to verify the theoretical analysis.

• 한국정보통신학회논문지
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• 제11권3호
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• pp.507-513
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• 2007

본 논문에서는 Certificateless 서명기법을 이용하여 Vehicular Ad-hoc 네트워크에서 공개키 인증서 관리 및 취소 문제를 다루지 않는 효율적인 인증 프로토콜을 제안한다. 또한, 빠르고 동적인 Vehicular Ad-hoc 네트워크의 노드(Vehicles)들의 특성을 고려하여 전통적인 공개키 구조에서의 인증서 취소 문제를 보다 효율적으로 해결하기위하여 구간 서명키 개념을 도입한다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2021년도 제63차 동계학술대회논문집 29권1호
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• pp.313-316
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• 2021

사물 인터넷 시스템에서 서버와 클라이언트의 신뢰성 확보는 매우 중요하다. 대부분의 IoT 시스템에서 신뢰성 확보를 위해 인증서 기법이 사용되고 있다. 인증서 기법을 사용하는 IoT 시스템은 데이터(인증서,공개키) 탈취 및 분실 취약점이 있다. 이러한 취약점을 강화하기 위해 서버와 클라이언트는 서로 주고받는 데이터의 무결성과 신뢰성을 보장할 수 있는 환경이 구축되어야 한다. 본 논문에서는 이러한 취약점을 보완하기 위하여 IPFS와 블록체인을 결합한 인증 강화 기법을 제시한다. 제시한 기법의 기본 개념은 IPFS를 이용하여 CA와 서버의 인증서와 공개키를 분산 저장하고, IPFS에 저장한 인증서와 공개키의 Content-Address를 블록체인에 보관한다. 마지막으로 제시한 기법의 타당성을 검토하기 위하여 Mobius, nCube, Ethereum, IPFS를 결합한 IoT 시스템을 구축하고 SSL을 사용한 인증 과정을 실험한다.

• 정보보호학회논문지
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• 제23권2호
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• pp.251-265
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• 2013

IT자원을 공유하여 서비스 형태로 제공하는 클라우드 컴퓨팅은 정보보호 이슈가 해결되지 않으면 활성화될 수 없다. 기업은 클라우드 컴퓨팅 서비스를 도입하여 정보통신 자원의 효율성을 극대화하고자 한다. 하지만 미국, 일본 등에 비해 국내에서 클라우드 컴퓨팅 서비스가 아직 활성화되지 못한 가장 큰 이유는 정보보호에 대한 신뢰가 부족하기 때문이다. 본 논문은 국내 외 클라우드 인증제도 및 가이드라인과 정보보호 관리체계 통제 항목을 비교 분석하여 한국형 클라우드를 위한 핵심 평가 기준 및 기존 정보보호 관리체계 통제 항목과의 중복성을 제거한 추가적인 평가 기준을 제안한다. 정보보호 관리체계 인증을 받은 클라우드 서비스 제공자는 추가 평가 기준만으로 중복되고 불필요한 인증 평가 작업을 최소화할 수 있다.