• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.361-366
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• 2001

A mim turbo-shaft engine of 50HP for UAV, which can be easily modified to turbo-prop and turbo-jet engine by sharing the core engine and has many applications to civilian demands and munitions, will be developed This kind of micro gas turbine engine has been developed mostly by the corporations which have special technology but are small in its scale. Especially, the gas turbine engine can be easily applied to other fields and developed by domestic technology, so that the sharing of technology is planed to realize through the cooperations with academies and research institutes. In this paper, the gas turbine engine, which has the compressor ratio of 3.8, the turbine inlet temperature of l180K and the engine speed higher than 100,000 rpm, is composed of centrifugal compressor, combustor, gas generator turbine, free power turbine and gear box. The competitiveness of the gas turbine engine can be obtained from minimizing its cost by the utilization of domestic infrastructure for the performance test and the decisive outsourcing.

• 한국의사학회지
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• 제28권1호
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• pp.1-10
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• 2015

This study examines the meaning of medical-text publication in the Joseon Dynasty by applying anthropological notions of "health care system" and "popular health care sector" to the social and political contexts of the pre-modern state. The present study focuses on the social network of senders and receivers in which medical knowledge is communicated and shared. Exploring the multi-layered structure of the network among the state, the author-practitioners, and populace, this study argues that the network of knowledge sharing system by publication of medical texts itself is a core structure in the health care system of the Joseon Dynasty. This pre-modern health care system aimed to vitalize and reinforce the "popular health care sector" by sharing medical knowledge with populace through the book-publication system. Foucault's notion of "biopolitics" provides a comparative window between the modern health care system and the health care system of the Joseon period, articulating the particularity of the pre-modern health care system.

• Journal of Power Electronics
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• 제16권1호
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• pp.111-120
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• 2016

Generally, a single phase H-bridge converter feeding a single primary track is employed in conventional inductive power transfer systems. However, these systems may not be suitable for some high power applications due to the constraints of the semiconductor switches and the cost. To resolve this problem, a novel dual coupled primary tracks IPT system consisting of two high frequency resonant inverters feeding the tracks is presented in this paper. The primary tracks are wound around an E-shape ferrite core in parallel which enhances the magnetic flux around the tracks. The mutual inductance of the coupled tracks is utilized to achieve adjustable power sharing between the inverters by configuring the additional resonant capacitors. The total transfer power can be continuously regulated by altering the pulse width of the inverters' output voltage with the phase shift control approach. In addition, the system's efficiency and the control strategy are provided to analyze the characteristic of the proposed IPT system. An experimental setup with total power of 1.4kW is employed to verify the proposed system under power ratios of 1:1 and 1:2 with a transfer efficiency up to 88.7%. The results verify the performance of the proposed system.

• Journal of Information Processing Systems
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• 제15권2호
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• pp.374-385
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• 2019

This paper presents an optimal implementation of a Daubechies-based pipelined discrete wavelet packet transform (DWPT) processor using finite impulse response (FIR) filter banks. The feed-forward pipelined (FFP) architecture is exploited for implementation of the DWPT on the field-programmable gate array (FPGA). The proposed DWPT is based on an efficient transpose form structure, thereby reducing its computational complexity by half of the system. Moreover, the efficiency of the design is further improved by using a canonical-signed digit-based binary expression (CSDBE) and advanced functional sharing (AFS) methods. In this work, the AFS technique is proposed to optimize the convolution of FIR filter banks for DWPT decomposition, which reduces the hardware resource utilization by not requiring any embedded digital signal processing (DSP) blocks. The proposed AFS and CSDBE-based DWPT system is embedded on the Virtex-7 FPGA board for testing. The proposed design is implemented as an intellectual property (IP) logic core that can easily be integrated into DSP systems for sub-band analysis. The achieved results conclude that the proposed method is very efficient in improving hardware resource utilization while maintaining accuracy of the result of DWPT.

• 융합정보논문지
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• 제9권2호
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• pp.100-107
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• 2019

본 연구는 델파이 조사 방법을 활용하여 놀이 전문가에게 필요한 능력과 요소가 무엇인지 탐색하고, 이를 바탕으로 놀이 전문가의 핵심역량을 측정하기 위한 도구를 개발하는데 목적이 있다. 문헌조사를 토대로 연구진은 놀이 전문가에게 필요한 핵심역량으로 놀이교육지식, 프로그램 개발력, 놀이문화 이해력, 창의성, 정보공유 및 적용을 선정하였다. 각 핵심역량은 3가지 하위역량을 보유하고 있으며, 각각의 하위역량에는 2가지 행동요소를 포함하고 있다. 연구 목적을 달성하기 위해 유치원과 초등학교 등의 놀이 관련 전문가 10명을 대상으로 2차에 걸친 델파이 조사를 실시하였다. 델파이 조사를 통해 놀이 전문가에 필요한 5가지 핵심역량과 각 핵심역량에 포함되는 3가지 하위역량을 확인하였다. 본 연구는 놀이 전문가가 갖추어야 할 핵심역량을 학문적으로 도출하였으며, 이를 측정할 수 있는 역량 척도를 개발하여 기초자료를 제안하였다는 점에서 학문적 실무적 시사점이 있다. 나아가 놀이가 사회문화적 맥락에서 자율적으로 기획되고 지원될 수 있도록 연속성의 개념을 토대로 향후 연구 방향을 제시하였다.

• 전기전자학회논문지
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• 제23권2호
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• pp.388-394
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• 2019

블록암호 알고리듬 ARIA와 AES 그리고 해시 함수 Whirlpool을 단일 하드웨어로 통합 구현한 AAW(ARIA- AES-Whirlpool) 크립토 코어를 Cortex-M0 CPU에 슬레이브로 인터페이스한 보안 SoC(System-on-Chip) 설계에 대해 기술한다. AAW 크립토 코어는 ARIA, AES, Whirlpool의 알고리듬 특성을 이용한 하드웨어 공유를 통해 저면적으로 구현되었으며, 128-비트와 256-비트의 키 길이를 지원한다. 설계된 보안 SoC 프로토타입을 FPGA 디바이스에 구현하고, 하드웨어-소프트웨어 통합 검증을 하였다. AAW 크립토 코어는 5,911 슬라이스로 구현이 되었으며, AAW 크립토 코어가 포함된 AHB_Slave는 6,366 슬라이스로 구현되었다. AHB_Slave의 최대 동작 주파수는 36 MHz로 예측되었으며, ARIA-128, AES-128의 데이터 처리율은 각각 83 Mbps, 78 Mbps이고, Whirlpool 해시 함수의 512-비트 블록의 처리율은 156 Mbps로 평가되었다.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2010년도 하계학술대회
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• pp.75-83
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• 2010

본 논문은 Web 2.0 도구를 활용하여 초등학교 학사 일정을 체계적이고 효율적으로 관리할 수 있는 방법에 관한 연구이다. 초등학교 학사 일정은 학교의 학사 일정을 총괄적으로 표시하고 관리하고 운영하는 일정표로서 기존 학사 일정 관리 체계는 학사 일정의 구성과 운영주체인 교사, 학부모, 학생의 정보의 공유와 참여가 효율적으로 이루어지지 못했다. 이에 따라 정보의 개방과 공유, 사용자의 참여를 핵심으로 하는 Web 2.0를 활용하여 초등학교 학사 일정 관리 시스템을 설계하고 구현하여 실험적으로 적용하여 보았다. 초등학교 학사 일정 관리에 Web 2.0 도구를 활용하면 교사, 학부모, 학생 간 정보의 원활한 소통과 공유가 가능하며 매년 거의 같은 일정이 반복되는 학교 일정의 특성상 정보의 재활용에 있어 매우 큰 의미를 갖는다.

• 한국문헌정보학회지
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• 제50권4호
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• pp.311-332
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• 2016

대학도서관은 사회적 요구 및 학술커뮤니케이션 시스템의 변화에 능동적으로 대응하면서 성장해왔다. 최근 연구데이터의 체계적인 관리 및 공유에 대한 사회적, 학술적 기대가 높아지고 있다. 미국, 영국, 호주 등에서는 국가의 재정지원을 통해 수행된 연구에서 생산되는 데이터를 보다 효과적으로 관리하고 공유하기 위한 정책을 시작한 바 있으며 이는 대학도서관에서 연구데이터 지원 서비스를 제공하게 된 직접적인 계기가 되고 있다. 본 연구에서는 미국에서 연구데이터 지원 서비스를 활발하게 제공하고 있는 네 개의 대학도서관을 대상으로 사례분석을 실시하였다. 구체적으로 이들 도서관이 전담조직을 만들게 된 배경과 어떻게 교육 서비스, 컨설팅 서비스 및 시스템 인프라를 제공하고 있는지를 비교 분석하였다. 사례분석을 통해 향후 국내 대학도서관에 적용할 수 있는 시사점을 도출하였다. 이는 주로 연구데이터 관련 교육 서비스를 개발하는 것과 연구데이터의 관리 및 공유와 관련된 전문 역량을 갖추는 것으로 요약할 수 있다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 춘계학술발표대회 논문집
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• pp.246-249
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• 2011

SolarPACES is an international cooperative network bringing together teams of national exports from around the world to focus on the development and marketing of concentrating solar power systems (also known as solar thermal power systems). It is one of a number of collaborative programs, called Implementing Agreements, managed under the umbrella of the International Energy Agency to help find solutions to worldwide energy problems. Technology development is at the core of the work of SolarPACES. Member countries work together on activities aimed at solving the wide range of technical problems associated with commercialization of concentrating solar technology, including large-scale system tests and the development of advanced technologies, components, instrumentation, and systems analysis techniques. In addition to technology development, market development and building of awareness of the potential of concentrating solar technologies are key elements of the SolarPACES program The Implementing Agreement specifies broad "Tasks," or thematic areas of work SolarPACES currently has three ongoing tasks, focusing on concentrating solar electric power systems (Task I), solar chemistry research (Task II), and solar technology and applications (Task III). An Operating Agent, nominated by the ExCo, is responsible for overseeing the work of each task Each task maintains a detailed program of work that defines all task activities, including their objectives, participants, plans, and budgets. In addition to technical reports of the activities and their participants, accomplishments and progress are summarized in the SolarPACES annual report. Many SolarPACES activities involve close cooperation among member countries (either through sharing of task activities or, occasionally, cost-sharing), although some cooperation is limited to sharing of information and results with other participants. In this paper, structure, works, and members of SolarPACES and Korean activies in the SolarPACES are introduced.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.320-323
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• 2011

SolarPACES is an international cooperative network bringing together teams of national experts from around the world to focus on the development and marketing of concentrating solar power systems (also known as solar thermal power systems). It is one of a number of collaborative programs, called Implementing Agreements, managed under the umbrella of the International Energy Agency to help find solutions to worldwide energy problems. Technology development is at the core of the work of Solar PACES. Member countries work together on activities aimed at solving the wide range of technical problems associated with commercialization of concentrating solar technology, including large-scale system tests and the development of advanced technologies, components, instrumentation, and systems analysis techniques. In addition to technology development, market development and building of awareness of the potential of concentrating solar technologies are key elements of the Solar PACES program. The Implementing Agreement specifies broad "Tasks," or thematic areas of work. SolarPACES currently has three ongoing tasks, focusing on concentrating solar electric power systems (Task I), solar chemistry research (Task II), and solar technology and applications (Task III). An Operating Agent, nominated by the ExCo, is responsible for overseeing the work of each task. Each task maintains a detailed program of work that defines all task activities, including their objectives, participants, plans, and budgets. In addition to technical reports of the activities and their participants, accomplishments and progress are summarized in the SolarPACES annual report. Many SolarPACES activities involve close cooperation among member countries (either through sharing of task activities or, occasionally, cost-sharing), although some cooperation is limited to sharing of information and results with other participants. In this paper, structure, works, and members of SolarPACES and Korean activies in the SolarPACES are introduced.