• Journal of Astronomy and Space Sciences
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• 제35권4호
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• pp.253-261
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• 2018

Korea Astronomy and Space Science Institute (KASI) has been developing the space optical and laser tracking (SOLT) system for space geodesy, space situational awareness, and Korean space missions. The SOLT system comprises satellite laser ranging (SLR), adaptive optics (AO), and debris laser tracking (DLT) systems, which share numerous subsystems, such as an optical telescope and tracking mount. It is designed to be capable of laser ranging up to geosynchronous Earth orbit satellites with a laser retro-reflector array, space objects imaging brighter than magnitude 10, and laser tracking low Earth orbit space debris of uncooperative targets. For the realization of multiple functions in a novel configuration, the SOLT system employs a switching mirror that is installed inside the telescope pedestal and feeds the beam path to each system. The SLR and AO systems have already been established at the Geochang station, whereas the DLT system is currently under development and the AO system is being prepared for testing. In this study, the design and development of the SOLT system are addressed and the SLR data quality is evaluated compared to the International Laser Ranging Service (ILRS) tracking stations in terms of single-shot ranging precision. The analysis results indicate that the SLR system has a good ranging performance, to a few millimeters precision. Therefore, it is expected that the SLR system will not only play an important role as a member of the ILRS tracking network, but also contribute to future Korean space missions.

• 환경생물
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• 제40권3호
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• pp.275-280
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• 2022

부유물질은 수생생물의 성장과 생존에 중요한 역할을 한다. 본 논문은 cyst에서 부화한 Artemia 유생(branchiopoda), 조간대에서 채집한 T. west (copepod)와 H. koreanus (amphipoda)를 사용하여 96시간 동안 부유물질에 노출된 생물의 생존 영향을 규명하였다. 실험 결과 Artemia 유생과 T. west의 생존율은 50.0mg L^-1 이상의 부유물질 농도에 영향을 받지 않으나 H. koreanus는 부유물질 농도가 증가함에 따라 낮은 생존율을 보였다(p<0.05). 결론적으로 50.0mg L^-1 이상의 부유물질에 지속적으로 노출된 Artemia 유생과 T. west는 미세한 생태 스트레스의 영향을 받지만 H. koreanus는 생존 가능한 내성범위를 벗어나 사망한 개체가 증가할 것으로 판단된다.

• 토지주택연구
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• 제6권4호
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• pp.177-184
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• 2015

본 연구는 "도시재생 활성화 및 지원에 관한 특별법(이하 도시재생특별법)"에 의한 도시재생사업에서 공공시행자의 역할을 모색하기 위하여 일본의 도시재생사업을 분석하여 국내에의 시사점을 도출하고자 하는 연구이다. '도시재생법'에서는 공공의 역할이 강조되고 있으나 도시재생활성화계획 수립 이후 사업시행단계에서의 공공의 역할에 대한 언급되지 않고 있어 향후 도시재생사업을 수행함에 있어서 일본 사례를 구체적으로 고찰해보는 것은 중요한 의의가 있는 것으로 판단된다. 구체적으로 일본 도시재생사업에서 공공시행자의 역할을 수행하고 있는 도시재생기구(UR)가 수행한 도쿄의 오오테마치 1-1지구, 시노노메 지구, 시부야역 가구, 오시아게 나리히라바시 4개 지구에 대한 심층 사례분석을 실시하였다. 사업수행체계에서 각 주체가 어떠한 역할을 담당하는지를 고찰해봄으로써 도시재생사업의 성공적인 수행을 위한 공공시행자의 역할을 제시하고자 하였다.

• 생태와환경
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• 제41권2호
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• pp.174-187
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• 2008

본 연구는 팔당호의 효과적인 호소관리를 위하여 미세 먹이망의 구조와 기능을 이해하고자 경안천(정점 K), 팔당댐 (정점 P)그리고 남 북한강 합류부(정점 M)에서 2005년 3월부터 12월까지 매월 1회씩 환경 요인과 미소 생물요인의 생물량을 조사하였다. 조사기간 동안 DOC는 $3{\sim}5$월 그리고 11월에 높은 값을 보였다. 영양염류는 다른 2개 정점보다 상대적으로 정점 K에서 높은 수치를 보였다. 인산염과 규산염은 여름철 집중강우기 이후에 3개 정점에서 점진적으로 증가하였으나, 9월 이후에는 감소하는 양상을 나타내었다. Chl-$\alpha$의 변화는 3개 정점에서 4월과 11월에 매우 높은 값을 보였다. 박테리아와 HNF의 탄소량은 3월, 5월 그리고 8월에 높은 값을 보였으나, 섬모충플랑크톤의 월별탄소량의 변화는 큰 변화를 보이지 않았다. 그럼에도 불구하고 섬모충플랑크톤(P<0.001)과 HNF(P<0.05)의 탄소량 변화는 박테리아 탄소량의 변화와 높은 상관관계를 보였다. 이 시기에는 Tintinnopsis cratera, Didinium sp., Vorticella sp., Paramecium sp. 그리고 Strombidium sp.가 우점종으로 밝혀졌다. 식물플랑크톤 우점종은 봄철, 여름철 그리고 가을철에 Stephanodiscus hantzschii와 Cyclotella meneghiniana가 3개 정점에서 모두 우점하였다. 그러나 가을철에는 정점 P와 정점 M에서 Aulacoseira granulata가 95%이상으로 극히 높게 우점하였다. 동물플랑크톤의 탄소량은 6월에 정점 P와 정점 M에서 가장 높은 생물량을 기록하였으며, 8월, 10월 그리고 11월에도 3개 정점에서 상대적으로 높은 생물량이 관찰되었다. 동물플랑크톤은 6월에 정점 P와 정점 M에서 Diaphanosoma brachyurum이 제1우점종으로 밝혀졌으며, 가을철인 10월과 11월에는 3개 정점에서 Bosmina longirostris가 우점하였다. Bosmina longirostris는 Aulacoseira granulata와 Stephanodiscus hantzschii를 먹이로 공급하였을 때 높은 성장률(A. granulata: $0.17\;d^{-1}$, S. hantzschii: $0.14^{-1}\;d^{-1}$)과 섭식률 (A. granulata: 1.93 preys $d^{-1}$, S. hantzschii: 1.63 preys $d^{-1}$)을 보였다. 이상의 결과로, 박테리아와 식물플랑크톤은 주요 먹이원으로서, 봄철과 여름철은 bacteria를 먹이로 하는 microbial food chain이 주요기능으로, 가을철에는 식물플랑크톤을 먹이로 하는 grazing food chain이 중요한 기능을 갖는 것으로 시사한다.

• Advances in robotics research
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• 제2권2호
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• pp.113-127
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• 2018

Robotics and automation are rapidly growing in the industries replacing human labor. The idea of robots replacing humans is positively influencing the business thereby increasing its scope of research. This paper discusses the development of an experimental platform controlled by a robotic arm through Robot Operating System (ROS). ROS is an open source platform over an existing operating system providing various types of robots with advanced capabilities from an operating system to low-level control. We aim in this work to control a 7-DOF manipulator arm (Robai Cyton Gamma 300) equipped with an external vision camera system through ROS and demonstrate the task of balancing a ball on a plate-type end effector. In order to perform feedback control of the balancing task, the ball is designed to be tracked using a camera (Sony PlayStation Eye) through a tracking algorithm written in C++ using OpenCV libraries. The joint actuators of the robot are servo motors (Dynamixel) and these motors are directly controlled through a low-level control algorithm. To simplify the control, the system is modeled such that the plate has two-axis linearized motion. The developed system along with the proposed approaches could be used for more complicated tasks requiring more number of joint control as well as for a testbed for students to learn ROS with control theories in robotics.

• 한국대기환경학회지
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• 제20권1호
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• pp.17-31
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• 2004

The subway play an important part in serious traffic problems. However, because subway system is a closed environment, many serious air pollution problems occurred in subway stations and injured passenger's health. Therefor, it is a necessary to identify sources and to estimate pollutant sources in order to protect passenger's health and to keep clean subway environment. The purpose of this study was to analyze a air quality in the subway stations and to apply a new receptor methodology for quantitatively estimate of PM10 sources. In this study, the size distributions of particulate matters has been measured by using Aerosizer LD (U.S.A., API, Inc.). It's real time measurement capability of time-of-flight technique offers a significant advantage of user convenience and air pollution management. Also, the mass concentrations of PM 10 has been measured by using mini-vol portable sampler (U.S.A., Airmetrics Co.). The sampling performed in Seoul subway stations during the period of February 2000 and April 2000. The number distribution data used in this study consisted of 26 raw data sets in the Jongno-sam-ga station. Correlation Analysis can be used in subway stations for source separation and identification. Then, number contribution from each source is determined by the particle number balance (PNB). The mass concentration data used in this study consisted of 31 raw data in the 8 different stations. The mass contributions of PM10 sources in the concourse by using PMF/CMB model.

• The Plant Pathology Journal
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• 제36권5호
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• pp.385-397
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• 2020

The ascomycete fungus Colletotrichum gloeosporioides infects a wide range of plant hosts and causes enormous economic losses in the world. The transcription factors (TFs) play an important role in development and pathogenicity of many organisms. In this study, we found that the C₂H₂ TF CgCrzA is localized in both cytoplasm and nucleus under standard condition, and it translocated from cytoplasm to nucleus in a calcineurin-dependent manner. Moreover, the ΔCgCrzA was hypersensitive to cell wall perturbing agents and showed severe cell wall integrity defects. Deletion of the CgCRZA inhibited the development of invasive structures and lost pathogenicity to plant hosts. Our results suggested that calcineurin-responsive TF CgCrzA was not only involved in regulating cell wall integrity, but also in morphogenesis and virulence in C. gloeosporioides.

• Journal of Microbiology and Biotechnology
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• 제30권7호
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• pp.1013-1017
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• 2020

Mealybugs (Hemiptera: Coccomorpha: Pseudococcidae) harbor diverse microbial symbionts that play essential roles in host physiology, ecology, and evolution. In this study we aimed to reveal microbial communities associated with two different mealybugs, papaya mealybug (Paracoccus marginatus) and two-tailed mealybug (Ferrisia virgata) collected from the same host plant. Comparative analysis of microbial communities associated with these mealybugs revealed differences that appear to stem from phylogenetic associations and different nutritional requirements. This first report on both bacterial and fungal communities associated with these mealybugs provides a preliminary insight on factors affecting the endomicrobial communities.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.484-486
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• 2005

Passenger safety is a primary concern of railway system but, it has been urgent issue that dozens of people are killed every year when they falloff from train platforms. Recently, advancements in IT have enabled applying vision sensors to railway environments, such as CCTV and stereo camera sensors. In this paper, we propose a stereoscopic video coding scheme for subway accident monitoring system. The proposed scheme is designed for providing flexible video among various displays, such as control center, station employees and train driver. We uses MPEG-2 standard for coding the left-view sequence and IBMDC for predicting the P- and B-types of frames of the right-view sequence. IBMDC predicts matching block by interpolating both motion and disparity predicted macroblocks. To provide efficient stereoscopic video service. we define both temporally and spatially scalable layers for each eye's-view by using the concept of Spatio-Temporal scalability. According to the experimental results. we expect the proposed functionalities will play a key role in establishing highly flexible stereoscopic video codec for ubiquitous display environment where devices and network connections are heterogeneous.

• 한국환경과학회지
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• 제14권3호
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• pp.311-325
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• 2005

Elements of atmospheric environment, temperature, humidity and wind, at the compus of KNU(Kyungpook National University) were investigated by the observations. The observed data were compared with those of DWS (Daegu Weather Station). The simulations of wind field and dispersions of polluted gases were conducted by MUKLIMO under the various conditions. The results show that the atmospheric environment of KNU are suitable but the campus does not play role as a heat sink in the city. The simulations of wind field show the air flows and wind channels in the campus clearly. The exhausted gases by motor vehicles on the northside street of campus affect very much to the campus with $NW(300^{\circ})$ wind. The running cars in the campus are also pollute much on the campus with the various wind directions. The characteristics of environmental conditions, various meteorological fields, wind channels, and dispersion of exhausted gases at the campus of KNU were understood quantitatively in the study.