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지진 재해 대응을 위한 진동 기반 구조적 관로 상태 감시 시스템에 대한 고찰
신동협,이정훈,장용선,정동휘,박희등,안창훈,변역근,김영준,Shin, Dong-Hyup,Lee, Jeung-Hoon,Jang, Yongsun,Jung, Donghwi,Park, Hee-Deung,Ahn, Chang-Hoon,Byun, Yuck-Kun,Kim, Young-Jun 대한상하수도학회 2021 상하수도학회지 Vol.35 No.5
As the frequency of seismic disasters in Korea has increased rapidly since 2016, interest in systematic maintenance and crisis response technologies for structures has been increasing. A data-based leading management system of Lifeline facilities is important for rapid disaster response. In particular, the water supply network, one of the major Lifeline facilities, must be operated by a systematic maintenance and emergency response system for stable water supply. As one of the methods for this, the importance of the structural health monitoring(SHM) technology has emerged as the recent continuous development of sensor and signal processing technology. Among the various types of SHM, because all machines generate vibration, research and application on the efficiency of a vibration-based SHM are expanding. This paper reviews a vibration-based pipeline SHM system for seismic disaster response of water supply pipelines including types of vibration sensors, the current status of vibration signal processing technology and domestic major research on structural pipeline health monitoring, additionally with application plan for existing pipeline operation system.
Study of ZnS/CIGS Hetero-interface for Cd-free CIGS Solar Cells
신동협(Shin, Donghyeop),김지혜(Kim, Jihye),고영민(Go, Youngmin),윤재호(Yun, Jaeho),안병태(Ahn, Byungtae) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
The Cu(In,Ga)Se2 (CIGS) thin film solar cells have been achieved until almost 20% efficiency by NREL. These solar cells include chemically deposited CdS as buffer layer between CIGS absorber layer and ZnO window layer. Although CIGS solar cells with CdS buffer layer show excellent performance, the short wavelength response of CIGS solar cell is limited by narrow CdS band gap of about 2.42 eV. Taking into consideration the environmental aspect, the toxic Cd element should be replaced by a different material. Among Cd-free candidate materials, the CIGS thin film solar cells with ZnS buffer layer seem to be promising with 17.2%(module by showa shell K.K.), 18.6%(small area by NREL). However, ZnS/CIGS solar cells still show lower performance than CdS/CIGS solar cells. There are several reported reasons to reduce the efficiency of ZnS/CIGS solar cells. Nakada reported ZnS thin film had many defects such as stacking faults, pin-holes, so that crytallinity of ZnS thin film is poor, compared to CdS thin film. Additionally, it was known that the hetero-interface between ZnS and CIGS layer made unfavorable band alignment. The unfavorable band alignment hinders electron transport at the heteo-interface. In this study, we focused on growing defect-free ZnS thin film and for favorable band alignment of ZnS/CIGS, bandgap of ZnS and CIGS, valece band structure of ZnS/CIGS were modified. Finally, we verified the photovoltaic properties of ZnS/CIGS solar cells.
퍼지 PD 제어기를 사용한 자율 무인 잠수정의 경유점 추적
신동협(Dong H. Shin),배설봉(Seol B. Bae),백운경(Woon K. Baek),주문갑(Moon G. Joo) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.5
In this paper, we suggest a fuzzy PD controller for robust control of AUV(autonomous underwater vehicle). We implement the fuzzy PD controller combining a fuzzy system and three PD controllers designed for the surge of 1.2, 2.4, and 3.6m/s, respectively to cope with the unknown external force. In the simulation, we assume a sea current at 1m/s in a fixed direction and simulate the AUV way-point tracking using PD controller and fuzzy PD controller, respectively. In the Matlab/Simulink simulation, random noises up to ±0.005m/s to the measurement of velocity and ±15°/s, to angular velocity are considered. As a result of simulation, the proposed fuzzy PD controller is shown to overcome 1m/s sea currents and to track the way-point within 1m error range.
한미 상호조달 체결에 대한 방산 수출 경쟁력 분석 연구
신동협 ( Donghyub Shin ) 한국국방기술학회 2020 한국국방기술학회 논문지 Vol.2 No.3
본 연구는 한미 상호조달 체결에 대한 국내 방산 수출 품목에 대한 영향성을 분석하였다. 주요 분석은 미국과 상호조달협정을 체결한 국가 3개국의 대미 무역수지 변화를 추정하고 한국의 대미 방산 관련 품목의 수출 경쟁력을 추정하였다. 분석결과에 따르면 한국은 미국 대비 항공기 분야에서 수출경쟁력이 높았고 한미 양국의 수출상품 구조로 상이하였다. 한미 상호조달 협정이 체결될 경우 항공 분야 품목은 수출 증가할 수 있으나 양국 간 방위 산업의 수출상품 구조가 상이하여 RDP 체결 이후에도 한국의 방산 관련품목의 대미 수출액은 당분간 크게 증가하지 않을 것으로 보인다. 그럼에도 불구하고 한미 간 상호조달협정은 경제학적인 분석으로만 결정되지 않을 수 있다. 따라서, 정부차원에서 방위산업 핵심기술 확보 지원, 국내 방산업체의 미국 국방조달 시장 진출 방안 등 한미 상호조달협정을 대비할 필요가 있다. This study analyzed the impact of domestic defense export items on the agreement of mutual procurement between the U.S. and South Korea. The main analysis estimated changes in trade balances with the U.S. in the three countries that signed mutual procurement agreements with the U.S. and estimated Korea's export competitiveness of defense-related items to the U.S. According to the analysis, Korea had a high export competitiveness in the aircraft sector compared to the United States and differed in the export product structure of Korea and the United States. If the Korea-U.S. mutual procurement agreement is signed, exports in the aviation sector could increase, but exports of defense-related items to the U.S. are unlikely to increase significantly after the RDP is signed. Nevertheless, the bilateral procurement agreement between South Korea and the U.S. may not be decided solely by economic analysis. Therefore, at the government level, it is necessary to prepare for the Korea-U.S. mutual procurement agreement, including support for securing core technologies in the defense industry and how domestic defense companies enter the U.S. defense procurement market.
신동협(Shin, Dong-Hyeop),윤재호(Yun, Jae-Ho),Larina, Liudmila,안병태(Ahn, Byung-Tae) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Recently, thin-film solar cells of Cu(In,Ga)Se₂(CIGS) have reached a high level of performance, which has resulted in a 19.9%-efficient device. These conventional devices were typically fabricated using chemical bath deposited CdS buffer layer between the CIGS absorber layer and ZnO window layer. However, the short wavelength response of CIGS solar cell is limited by narrow CdS band gap of about 2.42 eV. Taking into consideration the environmental aspect, the toxic Cd element should be replaced by a different material. It is why during last decades many efforts have been provided to achieve high efficiency Cd-free CIGS solar cells. In order to alternate CdS buffer layer, ZnS buffer layer is grown by using chemical bath deposition(CBD) technique. The thickness and chemical composition of ZnS buffer layer can be conveniently by varying the CBD processing parameters. The processing parameters were optimized to match band gap of ZnS films to the solar spectrum and exclude the creation of morphology defects. Optimized ZnS buffer layer showed higher optical transmittance than conventional thick-CdS buffer layer at the short wavelength below ~520 nm. Then, chemically deposited ZnS buffer layer was applied to CIGS solar cell as a alternative for the standard CdS/CIGS device configuration. This CIGS solar cells were characterized by current-voltage and quantum efficiency measurement.