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C.V.D. 방법에 의한 Cd_0.78Zn_0.22 S박막 성장과 광전기적 특성연구
유상하,이상렬,홍광준,서상석,김혜숙,전승룡,윤은희,문종대 조선대학교 기초과학연구소 1993 自然科學硏究 Vol.16 No.1
We had grown Cd_0.78Zn_0.22S polycrystal thin films on slide substrate using chemical vapour deposition(CVD) method. We measured X-ray diffraction patterns in order to study Cd_0.78Zn_0.22S polycrystal structure. We studied its band gap using transmission curves and photocurrent and also analyzed photoluminescence using configurational coordinate model. We measured Hall effect·on this sample by Van der Pauw method and studied on carrier density and mobility depending on temperature.
Paraquat의 殘留毒性에 미치는 완충액의 種類 및 光照射의 影響
金英美,申應男,李錦美,全相愛 효성여자대학교 가정대학 학도호국단 1984 家政大論集 Vol.3 No.-
완충액의 種類 및 光照射가 paraquat의 毒性低下에 미치는 影響을 검토한 結果 使用한 3種(sodium citrate, sodium phosphate, tris-HCl)의 완충액 中 sodium phosphate buffer에 paraquat를 용해하였을 때가 가장 큰 幅으로 毒性이 低下되었다. 經時的으로는 1日만에 約 60%의 細菌이 生育하였고 4日째 내는 95% 以上의 細菌이 生育함으로써 sodium phosphate buffer 中에서는 約 4日만에 paraquate의 毒性이 거의 消滅되었다. 한편, 暗所에 保有한 paraquate에 比하여 自然光구에서 1.3倍 紫外線 照射구에서 約 2倍의 生有율이 檢出되므로 光照射에 의하여 paraquat의 毒性이 보다 빨리 消滅되는 것으로 判斷되었다. Experiment was carried out to understand the effect or buffer solution and light irradiation on toxicity of paraquat against microorgnism. Paraquat most rapidly lost its toxicity in the sodium buffer solution among three kinds of tested solutions. (sodium citrate, sodium phosphate and tris-HCI) By previous incubation of paraquat in the solution for 24 hours, the organism showed about 60 percent of survival rate. The paraquat lost almost of its toxicity as showing at least 95 per cent of survival by continuous incubation for 4 days. The organism showed a survival rate of 1.3 times higher by natural light irradiation and 2.0 times higher by ultraviolet ray irradiation than control.
가우시안 프로세스를 이용한 실내 환경에서 소형무인기에 적합한 SLAM 시스템 개발
전영산(Young-San Jeon),최종은(Jongeun Choi),이정욱(Jeong Oog Lee) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.11
Localization of aerial vehicles and map building of flight environments are key technologies for the autonomous flight of small UAVs. In outdoor environments, an unmanned aircraft can easily use a GPS (Global Positioning System) for its localization with acceptable accuracy. However, as the GPS is not available for use in indoor environments, the development of a SLAM (Simultaneous Localization and Mapping) system that is suitable for small UAVs is therefore needed. In this paper, we suggest a vision-based SLAM system that uses vision sensors and an AHRS (Attitude Heading Reference System) sensor. Feature points in images captured from the vision sensor are obtained by using GPU (Graphics Process Unit) based SIFT (Scale-invariant Feature Transform) algorithm. Those feature points are then combined with attitude information obtained from the AHRS to estimate the position of the small UAV. Based on the location information and color distribution, a Gaussian process model is generated, which could be a map. The experimental results show that the position of a small unmanned aircraft is estimated properly and the map of the environment is constructed by using the proposed method. Finally, the reliability of the proposed method is verified by comparing the difference between the estimated values and the actual values.