• 제목/요약/키워드: future research

검색결과 23,347건 처리시간 0.039초

Generation and Detection of Terahertz Waves Using Low-Temperature-Grown GaAs with an Annealing Process

  • Moon, Kiwon;Choi, Jeongyong;Shin, Jun-Hwan;Han, Sang-Pil;Ko, Hyunsung;Kim, Namje;Park, Jeong-Woo;Yoon, Young-Jong;Kang, Kwang-Yong;Ryu, Han-Cheol;Park, Kyung Hyun
    • ETRI Journal
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    • 제36권1호
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    • pp.159-162
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    • 2014
  • In this letter, we present low-temperature grown GaAs (LTG-GaAs)-based photoconductive antennas for the generation and detection of terahertz (THz) waves. The growth of LTG-GaAs and the annealing temperatures are systematically discussed based on the material characteristics and the properties of THz emission and detection. The optimum annealing temperature depends on the growth temperature, which turns out to be $540^{\circ}C$ to $580^{\circ}C$ for the initial excess arsenic density of $2{\times}10^{19}/cm^3$ to $8{\times}10^{19}/cm^3$.

Analysis of Failure in Miniature X-ray Tubes with Gated Carbon Nanotube Field Emitters

  • Kang, Jun-Tae;Kim, Jae-Woo;Jeong, Jin-Woo;Choi, Sungyoul;Choi, Jeongyong;Ahn, Seungjoon;Song, Yoon-Ho
    • ETRI Journal
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    • 제35권6호
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    • pp.1164-1167
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    • 2013
  • We correlate the failure in miniature X-ray tubes with the field emission gate leakage current of gated carbon nanotube emitters. The miniature X-ray tube, even with a small gate leakage current, exhibits an induced voltage on the gate electrode by the anode bias voltage, resulting in a very unstable operation and finally a failure. The induced gate voltage is apparently caused by charging at the insulating spacer of the miniature X-ray tube through the gate leakage current of the field emission. The gate leakage current could be a criterion for the successful fabrication of miniature X-ray tubes.

미래주거 계획개념의 전개과정에 대한 역사적 고찰(1) -19세기-20세기 전반기에 제시된 미래주거 계획개념을 중심으로- (The Historical Research of the Future Housing Planning Concept(1) -Focused on the Future Housing Planning Concept proposed from the 19C to the beginning of the 20C-)

  • 김미경;박영순
    • 한국실내디자인학회논문집
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    • 제14호
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    • pp.90-98
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    • 1998
  • At the threshold of the 21st century People have been exploring the future of each field. Accordingly In the area of housing the increase in income level and high-technology development facilitated full scale research on the future housing. The purpose of this research is to try to set up a systematic theory on the future housing by investigating theoretical backgrounds of the future housing and development of the future housing planning concept, A document research method was used to analyze the development of the future housing planning concept of three periods from its origin in the 19th century to present : the burgeoning period growing period and maturing period. In particulary this research examines development of the future housing planning concept from the 19th century in which future housing planning concept was emerged to the early part of the 20th century: the burgeoning period. The future housing planning concepts of this period are analyzed as follows ; In order to solve the social problems arising in the process of the Industrial Revolution, the concept such as ; "ideal city", "high rise apartment housing" and "industrialized housing" was formulated. housing" was formulated.ated.

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미래사회에 대응하는 학교건축 계획방향에 대한 기초연구 - 초.중.고등학교 시설을 중심으로 - (A Study for Architectural Planning of the School Corresponding to the Future Society - Focus on the Elementary school, Middle school and High school facilities -)

  • 송병준;주범
    • 한국실내디자인학회논문집
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    • 제20권1호
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    • pp.190-198
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    • 2011
  • The purpose of this research is to suggest the direction of the school planning for the future that could respond actively to fast-changing circumstances of the times. The specific purpose is as follows. First, this research creates the education spatial model for the future that could prepare the education for globalization, informationization, liberalization and suggests the direction of the school planning that would correspond to the revised curriculum in 2009. Based on the research findings, establish the fundamental architectural planning guidelines and provide a blueprint of the advanced school for the future. Second, this research suggests diverse layout method of the school building blocks for the future. Key factors, which are method of teaching, planning for eco-school, planning for ubiquitous computing environment, planning of mixed-use school facilities that would give direction of the school planning for the future are determined through theoretical consideration about the social structure, direction of education for the future and case study. Based on these keys factors, this research suggests directions of the school planning for the future.

CCS (Carbon Capture & Sequestration) 기술·경제성 평가 분석 (Development of Techno-Economic Evaluation Model for CCS (Carbon Capture & Sequestration))

  • 이지현;곽노상;이동욱;심재구;이정현
    • 한국기후변화학회지
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    • 제7권2호
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    • pp.111-120
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    • 2016
  • In this study, Techno-economic evaluation model for carbon capture & sequestration (CCS) technologies are reviewed. Based on a key parameters of Korea's electricity market, performance data of 10 MW-scale post-combustion $CO_2$ capture pilot plant in Boryong station, the cost of $CO_2$ avoided was evaluated followed by international guideline suggested by IEA CCS costing methods task force. The result showed that Korea's Electricity cost including CAPEX & OPEX of reference power plant is relatively low compared to OECD nations which lead to a lower CCS cost ($33USD\;t/CO_2$). And future work using newly evaluated CAPEX & OPEX data of power plant with/without CCS is recommended.