• 한국정보전자통신기술학회논문지
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• 제15권6호
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• pp.449-456
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• 2022

최근 사과 등의 과수 농가의 재배 방법이 생산성 증가, 농약 살포 감소 등의 목적으로 수고가 높아지는 경향이 있고, 우리나라 고소작업차의 기술이 발전함에 따라 필리핀 등지의 동남아에서의 수요가 지속적으로 늘고 있으며 우리나라 농업용 고소작업차의 경우 대부분 3,300mm~3,800mm까지 작업대가 올라가 작업자가 작업할 수 있는 최대높이는 4.5m 정도까지에 불과하여, 더 높은 고소작업이 가능한 고소작업차는 수입에 의존하고 있다. 이에 본 논문에서는 5.5m 상승 7m 이상의 작업공간을 확보할 수 있는 붐 및 마스터 시스템을 조합한 다목적 직립형 스마트 고소작업차 개발을 위한 연구로서 고소작업차의 설계 및 설계 검증을 위한 구조해석과 이를 바탕으로 한 고소작업차 구현에 대한 논문이다.

• 한국항공우주학회지
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• 제31권9호
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• pp.38-45
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• 2003

본 논문은 Strain Energy Hinge(SEH)를 갖는 다목적 2호기의 태양전지판 전개에 대한 동적 모델링과 관련이 있다. 이 연구를 위해 SEH는 단순한 비틀림 스프링으로 치환되었으며 인공위성과 태양전지판은 강체로 가정하고 운동방정식을 유도하였다. 또한 모델링에 지상 실험에 가장 큰 영향을 주고 있는 것으로 관찰된 지지줄의 영향을 고려하였다. 무중력 상태에서의 전개와 지상 전개 결과를 비교한 결과 태양전지판의 전개는 유사하나 인공위성의 운동은 지지줄의 영향으로 인해 전혀 다른 것으로 나타났다. 결론적으로 지상 전개 실험 장치를 이용해 무중력 상태의 태양전지판 전개를 어느 정도 정확하게 묘사할 수 있다. 또한 지지줄의 영향을 조사한 결과 현재 실험실의 지지줄의 길이가 적합한 것으로 나타났다. 지상실험 결과와의 비교는 다음 논문에서 다룬다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제27권3호
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• pp.51-60
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• 2021

Purpose: The purpose of this study is to derive the residential environment design elements that affect suicide, and then analyze the actual situation in terms of suicide prevention and suggest implications. Methods: The study was conducted through literature analysis, field surveys, and interviews with stakeholders. Results: As a result of extracting the variables related to the residential environment that affect suicide suggested in a total of 18 papers, 15 variables were extracted and organized into major categories such as housing type, health and welfare facilities, leisure and cultural facilities, and living environment. Next, we selected a public rental housing complex with a relatively high suicide rate among multi-family housing as the case, and conducted a empirical analysis. It was investigated that the facilities were insufficient, and apart from the quantitative satisfaction of the rest, various problems were exposed, such as the classification of users according to age and insufficient management in terms of the actual use of residents including suicide attempters. Implications: First, it is necessary to search for the design direction of the residential environment for suicide prevention. Second, it is necessary to find a way to solve the exclusion phenomenon that appears in space and programs. Third, when planning a space for suicide prevention, understanding of the behavior of high-risk groups should be reflected.

• 우주기술과 응용
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• 제1권3호
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• pp.337-355
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• 2021

본 논문은 SAR 위성 기술의 현황을 조사하여 향후 우리나라 HRWS SAR (High Resolution Wide Swath Synthetic Aperture Radar) 위성을 개발하기 위한 전략을 제안하기 위해 만들어졌다. 현황조사를 통해, 최신 SAR 기술 동향은 SAR 위성 영상을 보다 적극적으로 활용하기 위해 DBF(Digital Beam-Forming), SCORE(SCan-On-REceive), DPCA(Displaced Phase Center Antenna), 간섭계, 그리고 편파 기술을 사용하는 것이라는 것을 알 수 있었다. 이와 같은 최신 SAR 기술 동향 및 해외 HRWS SAR 개발 사례를 기반으로, 수년 내로 발사가 예정된 KOMPSAT-6(KOrea Multi-Purpose SATellite-6)를 사용하여 DPCA 및 SCORE 기술을 개발하고, 결국에는 전지구를 일주일 간격으로 관측할 수 있는 HRWS SAR 위성을 개발하는 것을 향후 우리나라 HRWS SAR 위성 개발을 위한 전략으로 제안하였다.

• 한국주거학회논문집
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• 제13권3호
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• pp.103-113
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• 2002

The purpose of this study is to find out the characteristics of users'behavior for the planning of the shared community space(SCS). It was analyzed and estimated that the present status of the SCS of the contemporary multi-family housing sites in Korea and the residents'behavior in the SCS. Theoretic investigation and empirical research methods were used in this study. The empirical survey focused on seeking out user-oriented design criteria, based on the analysis of residents'usage behavior for the SCS. The analysis was made by both quantitative and qualitative methods. The results of this study are as follows; First, as to the usage status survey for the SCS, there is a difference in the degree of usage according to their locations. Second, as to the analysis of the SCS through a mental map, the sketch map analysis is found to be a useful research method for the SCS planning by actualizing the residents'behavior characteristics. In detail, the main characteristics in the SCS planning are nearness, centrality, intimacy, combination of facilities and the connection with the main paths of the complex.

• International Journal of Aeronautical and Space Sciences
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• 제1권1호
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• pp.70-80
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• 2000

The attitude knowledge error model is formulated for specifically KOMPSAT attitude determination system using the Lefferts/Markley/Shuster method, and the attitude determination(AD) error analysis is performed so as to investgate the on-board attitude determination capability of KOrea Multi-Purpose SATellite(KOMPSAT) using the covariance analysis method. Analysis results show there is almost no initial value effect on Attitude Determination (AD) error and the sensor noise effects on AD error are drastically decreased as is predicted because of the inherent characteristic of Kalman filter structure. However, it shows that the earth radiance effect of IR-sensor(earth sensor) and the bias effects of both IR-sensor and fine sun sensor are the dominant factors degrading AD error and gyro rate bias estimate error in AD system. Analysis results show that the attitude determination errors of roll, pitch and yaw axes are 0.056, 0.092 and 0.093 degrees, respectively. These numbers are smaller than the required values for the normal mission of KOMPSAT. Also, the selected on-orbit data of KOMPSAT is presented to demonstrate the designed AD system.

• Journal of Astronomy and Space Sciences
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• 제15권2호
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• pp.437-447
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• 1998

한반도의 지도 제작을 주임무로 1999년에 발사될 다목적 실용위성의 궤도 오차를 GPS 항행 해와 지상 안테나의 추적 데이터를 이용하여 분석하였다. 측정 데이터의 잡음과 모델 링의 오차를 고려하여 최소 자승 방법으로 궤도 결정과 예측 오차를 시뮬레이션 하였다. 측정 데이터의 잡음은 단기간 오차의 주 요인이 되며, 태양 플럭스의 불확실성으로 인한 오차가 궤도 예측 오차에 가장 크게 작용함을 알 수 있었다.

• Journal of Astronomy and Space Sciences
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• 제17권1호
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• pp.117-122
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• 2000

The KOMPSAT(Korea Multi-Purpose SATellite) has two optical imaging instruments called EOC(Electro-Optical Camera) and OSMI (Ocean Scanning Multispectral Imager). The image data of these instruments are transmitted to ground station and restored correctly after post-processing with the telemetry data transfeered from KOMPSAT spacecraft. The major timing information of the KOMPSAT is OBT (On-Board Time) which is formatted by the on-board computer of the spacecraft, based on 1Hz sync. pulse coming from the GPS receiver involved. The OBT is transmitted to ground station with the house-keeping telemetry data of the spacecraft while it is distributed to the instruments via 1553B data bus for synchronization during imaging and formatting. The timing information contained in the spacecraft telemetry data would have direct relation to the image data of the instruments, which should be well explained to get a more accurate image. This paper addresses the timing analysis of the KOMPSAT spacecraft and instruments, including the gyro data timing analysis for the correct restoration of the EOC and OSMI image data at ground station.

• International Journal of Aeronautical and Space Sciences
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• 제8권1호
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• pp.87-94
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• 2007

Tilt rotor-wing concept to show enhanced performance in low speed mission is presented. Three types of stud wings on the existing tilt rotor configuration are suggested and their characteristics are compared. Aerodynamic analysis indicates that the stud wing concept gives significant performance improvement on the endurance and range in the low speed regime when compared with the tilt rotor. Penalties of the stud wing are discussed from the perspectives of conversion corridor, structural weight, configuration design, and cross wind stability. This study concludes that the advantage of the stud wing in general UAV mission performance is so significant as to surpass the penalties in other perspectives investigated.

• 산업기술연구
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• 제21권A호
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• pp.81-88
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• 2001

In this work, we have developed a 2 degrees of freedom(DOF) motion simulator that can generate the sensation of motion in a 6 DOF space. The motion base has the DOF of roll and pitch, and the purpose of the motion base is to create the sensation of riding a vehicle in a 3D space by controlling the motion base. The dynamics of the mechanism was analysed and the optimal design of the motion base mechanism has been reached. The prototype motion base mechanism was developed and tested. The multi-axis motion controller(MMC) was used to control the two AC servo meters that drive the roll and pitch motion.