• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제41회 하계 정기 학술대회 초록집
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• pp.71-71
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• 2011

Dye-sensitized solar cells (DSCs) have drawn great academic attention due to their potential as low-cost renewable energy sources. DSCs contain a nanostructured TiO2 photoanode, which is a key-component for high conversion efficiency. Particularly, one-dimensional (1-D) nanostructured photoanodes can enhance the electron transport for the efficient collection to the conducting substrate in competition with the recombination processes. This is because photoelectron colletion is determined by trapping/detrapping events along the site of the electron traps (defects, surface states, grain boundaries, and self-trapping). Therefore, 1-D nanostructured photoanodes are advantageous for the fast electron transport due to their desirable features of greatly reduced intercrystalline contacts with specified directionality. In particular, anodic TiO2 nanotube (NT) electrodes recently have been intensively explored owing to their ideal structure for application in DSCs. Besides the enhanced electron transport properties resulted from the 1-D structure, highly ordered and vertically oriented nanostructure of anodic TiO2 NT can contribute additional merits, such as enhanced electrolyte diffusion, better interfacial contact with viscous electrolytes. First, to confirm the advantages of 1-D nanostructured material for the photoelectron collection, we compared the electron transport and charge recombination characteristics between nanoparticle (NP)- and nanorod (NR)-based photoanodes in DSCs by the stepped light-induced transient measurements of photocurrent and voltage (SLIM-PCV). We confirmed that the electron lifetime of the NR-based photoanode was much longer than that of the NP-based photoanode. In addition, highly ordered and vertically oriented TiO2 NT photoanodes were prepared by electrochemical anodization method. We compared the photovoltaic properties of DSCs utilizing TiO2 NT photoanodes prepared by one-step anodization and two-step anodization. And, to reduce the charge recombination rate, energy barrier layer (ZnO, Al2O3)-coated TiO2 NTs also applied in DSC. Furthermore, we applied the TiO2 NT photoanode in DSCs using a viscous electrolyte, i.e., cobalt bipyridyl redox electrolyte, and confirmed that the pore structure of NT array can enhance the performances of this viscous electrolyte.

• 한국방사선학회논문지
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• 제9권7호
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• pp.439-443
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• 2015

종래의 방사선 의료영상 센서는 방사선에 의해 생성된 전하신호를 화소내에서 적분하는 방식이다. 본 연구에서는 저선량에서 우수한 해상력이 가능한 광계수형 영상센서를 개발하기 위해 진공 열증착법을 이용하여 다결정 CdTe(p-CdTe) 필름을 제작하였다. 또한, 광계수형 센서의 성능평가를 위하여 물리적 특성(SEM, XRD) 및 전기적 특성(leakage current, x-ray sensitivity, SNR) 평가를 하였다. 측정 결과, $1V/{\mu}m$ 이하의 인가전압에서 $5nA/cm^2$ 이하의 누설 전류밀도를 보였으며, X선 발생신호량은 $7{\mu}C/cm^2{\cdot}R$으로 광계수형 센서로의 적용에 적합한 것으로 평가되었다. 또한, 신호대잡음비는 동작영역에서 5000 이상의 값을 보였다.

• 한국전자통신학회논문지
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• 제5권5호
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• pp.487-492
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• 2010

본 연구에서는 분뇨수집운반차량의 분뇨수거량을 정확하게 계측하고, 계측된 결과를 이용하여 청소요금을 산출할 수 있는 시스템을 개발하였다. 탱크내부의 높이를 계측할 수 있는 수위센서 센서회로 그리고 분뇨수거 작업자가 편리하게 사용할 수 있도록 휴대형 중앙처리연산장치를 개발하였다. 청소요금을 수거현장에서 징수할 수 있도록 영수증 출력기능도 내장되었다. 또한 경사진 현장에서 작업을 진행하여도 각도센서를 이용하여 탱크 내부에 분뇨가 수거되는 량을 정확하게 측정할 수 있도록 하였다. 본 연구결과를 통하여 분뇨수거 시 발생되는 민원을 감소시킬 수 있으며, 특화된 시스템의 수출로 외화획득이 기대된다.

• 한국폐기물자원순환학회지
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• 제35권8호
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• pp.785-798
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• 2018

Since the Framework Act on Resource Circulation was enacted in 2018, the government should establish a National Resource Circulation Master Plan every 10 years, which defines mid- to long-term policy goals and directions on the efficient use of resources, prevention of waste generation and recycling of waste. In addition, we must set mid- to long-term and stepwise targets for the final disposal rate, recycling rate (based on sorted recyclable materials and recycled products), and energy recovery rate of wastes, and relevant measures should be taken to achieve these targets. However, the current industrial waste (IW) statistics have limitations in setting these targets because the final disposal rate and recycling rate are calculated as the ratio of the recycling facility input to the IW generation. In this study, the material flow from the collection stage to the final disposal of industrial waste was analyzed based on the generation of 2016, and the actual recycling amount, actual incineration amount, final disposal amount and their rates were calculated. The effect on the recycling, incineration and final disposal rates was examined by changing the treatment method of nonhazardous wastes from the factory and construction and demolition wastes, which were put in landfills in 2016. In addition, the variation of the waste treatment charge was investigated according to the change of treatment methods. The results of this study are expected to be effectively used to establish the National Resource Circulation Master Plan and industrial waste management policy in the future in South Korea.

• 한국간호교육학회지
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• 제28권4호
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• pp.433-443
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• 2022

Purpose: This qualitative study was to understand the awareness of epidemiological investigation tasks for nurses who were in charge of coronavirus disease 2019 (COVID-19) epidemiological investigations. Methods: Before data collection, written consent was obtained from 13 participants, and the data were then collected from September 1 to December 31, 2021. Individual interviews were conducted and recorded by video interview using Zoom, and data were transcribed verbatim. Four themes were derived by using the qualitative thematic analysis method. Results: The participants perceived that epidemiological investigations were burdensome but that the field work was important, and that expertise and collaboration were required. The participants started work without preparation due to the explosive increase in the number of confirmed COVID-19 cases, and they recognized work conflicts, unstable employment, and exhaustion as obstacles to their work performance. On the other hand, the participants took pride in contributing to the national epidemiological investigation and control and felt a sense of responsibility as nursing professionals. Finally, participants mentioned that the training of infectious disease practitioner was important for work improvement. Conclusion: Further research is needed on the development of standardized manuals for the training of nursing personnel as infectious disease specialists through the job analysis of epidemiological investigators.

• 한국항해항만학회지
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• 제28권10호
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• pp.881-889
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• 2004

현재 시범 시행중인 자동요금징수(ETC: Electronic Toll Collection) 서비스는 차량 주행 중에 차량내의 자동요금징수 서비스 전용 단말기에 내장된 카드 리더 장치로부터 삽입된 스마트 카드의 정보를 읽어 과금을 결재하는 방식을 채택하고 있다. 본 논문에서는 현 ETC 시스템인 카드 리더 방식에서 발생되는 단점을 극복하고 처리하여 성능이 향상된 자동요금징수 서비스를 위하여 차량이 주행 중에 휴대폰을 이용하여 통행료를 자동으로 징수하는 시스템을 제안한다. 휴대폰을 이용한 자동요금징수 결재 시스템을 통하여 운전자는 카드리더의 이용시 발생되는 카드와 카드 리더간의 불일치로 발생될 수 있는 문제점을 극복할 수 있으며 나아가 휴대폰을 이용하여 요금을 결재함으로서 보다 능률적인 데이터 처리 및 편리한 사용자 환경을 구축하였다.

• 환경정책연구
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• 제14권1호
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• pp.135-158
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• 2015

수은함유폐기물의 효율적인 관리방안을 마련하고자 국내 및 선진국의 유해성이 있는 폐형광등 관리 및 처리현황을 검토하였다. 국내 폐기물 관리법에서는 수은함유폐기물이라도 생활계에서 배출되면 생활폐기물로 분류하고 있으며 생활계에서 배출되는 유해성이 있는 수은함유폐기물에 대해서는 관리가 되고 있지 않다. 다만 일부 수은함유폐기물에 대해 "자원의 절약과 재활용 촉진에 관한 법률"에 따라 폐기물 부담금제도와 재활용의무대상품목에 포함되어 관리되고 있다. 따라서 폐형광등의 관리현황으로부터 수은함유폐기물의 별도의 관리방안에 수집 방안 확대와 고도처리방법 등을 포함하였고, 이러한 수은함유폐기물의 수거에서 최종 처리되는 단계까지 주체별 역할에 대해 제시하여 더욱 효율적인 관리가 이루어지도록 하였다.

• 한국의학물리학회지:의학물리
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• 제7권2호
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• pp.29-40
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• 1996

조사선량율 5mR/h 이상에서 동작하는 원통형 전리함을 설계ㆍ제작하고 상용의 전류계를 이용하여 전하수집 특성을 조사하였다. 전리함은 전체 길이 15.5cm, 직경 5.22cm인 원통형이고 활성체적은 190.4㎤이다. 전리함의 전극은 벽면, 중심축 및 보호전극으로 구성하고, 이들을 동심축상에 배치하여 바탕전류가 8.39$\times$$10^{-14}$ $\pm$1.5$\times$$10^{-15}$ A이 되게 하였다. 전리함에 인가된 전입이 400V일 때 Cs$^{137}$에 대하여 99.7%의 수집효율을 보였으며, 상용의 선량계와 비교한 결과 교정정수 4.531$\times$19$^{7}$ R/C를 구하였다. 에너지 응답특성은 Cs$^{137}$ 을 1로 하였을 때 Am$^{241}$과 Co$^{60}$ 는 각각 1.30, 1.05로 나타났다. 방사선이 전리함의 측면으로 입사할 경우 입사방향에 따른 응답특성의 차이는 무시할 수 있었다.

• 정보관리연구
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• 제39권4호
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• pp.67-96
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• 2008

오픈액세스 리포지터리는 법적, 경제적, 기술적 장벽 없이 전 세계 이용자 누구라도 자유롭게 무료로 정보에 접근할 수 있도록 생산자와 이용자가 정보를 공유할 수 있는 지식정보 저장소를 의미한다. 본 연구에서는 기관 리포지터리(dCollection, DSpace@MIT)와 주제별 리포지터리(arXiv, PubMed Central)로 구분하여 각 리포지터리에서 제공하는 기능분석과 비교를 실시하였고 분석된 자료를 기초로 이용자 중심의 사용성 평가를 실시하였다． 정보에 대한 자유로운 접근과 공유가 중요시 되는 웹 2.0시대라 불리고 있는 현 시점에서, 오픈액세스 리포지터리에 대한 사용성 평가를 실시함으로서 향후 구축되는 리포지터리 개발에 기초자료가 될 수 있다는 점에서 그 의의가 있다고 할 수 있다.

• 수산경영론집
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• 제54권3호
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• pp.69-92
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• 2023

The 'Japanese Useful Fisheries Classification Table', published in advance before the publication of the "Useful Fisheries of Japan", is the first data to classify and introduce fisheries animals and plants in a single table. Therefore, it had received public attention immediately. However, The academy of animal studies at that time quickly pointed out that this classification table was a mixture of traditional and modern classifications, and that there were too many errors. However, Yoshio Tanaka, who was in charge of revising Yamamoto Arikatana, that wrote the classification table, was not an adherent of traditional taxonomy, nor was he ignorant of modern taxonomy. Nevertheless, the classification table, which was quite different from the well-known zoological classification at that time, was prepared. For example, the top classifications of marine organism are not at the same level, but rather a mixture of phylum and class, while the water insect contains several phylums, including Arthropoda, Echinodermata, Mollusca, and Coelenterata. As such, the method of classification of animals in the classification table was hard to understand in the zoological academy at that time. The reason for this unusual taxonomy was that the classification table showed classification of useful fisheries products, not intended to convey academic classification. In other words, it is not for the purpose of academic classification of all fishery products, but for the purpose of presenting standards that can be easily understood by those engaged in the collection, manufacture, and aquaculture of fishery products. This principle of 'Useful Fisheries of Japan' is also ascertained in the "Fishing Methods of Japan" and "Fishery Products of Japan". Regarding the collection and processing of marine products, it could have shown how to catch whales, which are mammals, and how to dismantle whales and obtain oil and meat, according to academic classifications. However, the first appearances in the book include dried squid, abalone, shark fins, and sea cucumbers. In other words, the most important fishery products at that time are presented first. The contents of the classification table, which is considered somewhat bizarre, show where the purpose to compile Useful Fisheries of Japan.