• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1334-1337
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• 1997

A spacecraft attitude control ground hardware simulator development is discussed in the paper. The simulator is called KT/KARI HILSSAT(Hardware-In-the Loop Simulator Single Axis Testbed), and the main structure consists of a single axis bearing and a satellite main body model on the bearing. The single axis tabel as ans experimental hardware simulator that evaluates performance and applicability of a satellite before evolving and/or confirming a mew or and old control logic used in the KOREASAT is developed. Attitude control of spaceraft by using reaction wheel is performed.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1233-1236
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• 1996

Attitude Control System for a Hydrofoil type catamaran in wave is designed using a Decentralized Adaptive Control technique which is announced already by authors. This automatic attitude control system is designed for its good seaworthiness and for robustness on the variation of center of gravity. The performance is compared with a PID controller and the results show that the Decentralized Adaptive controller has better stability on the variation of the center of gravity.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1103-1106
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• 1996

Disturbance Accommodating Attitude control logic for 3-axis stabilized spacecraft is designed and compared with PIID control logic. PID controller provide the zero steady error for constant disturbances. PIID controller detect and cancel disturbances upto the ramp input. PID control logic is designed as the main control logic. We designed the disturbance observer to detect the effect of disturbance using the sinusoidal function. The detected disturbance are compensated by the additional control logic. The comparison simulation is conducted between PIID and PIID with DAC. The simulation results show that PIID with DAC shows the better attitude pointing accuracy.

• 항공우주시스템공학회지
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• 제4권4호
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• pp.37-43
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• 2010

Need for agile satellites increases for performing various mission due to increase of satellite image applications and users. This paper performs attitude maneuver analysis by using Satellite Tool Kit(STK) made by AGI. In order to automate the STK analysis process, a MATLAB program is developed to generate STK input data and to process STK output data. Five attitude maneuver modes are analyzed and attitude angle variation and required torques are calculated.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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• pp.53-57
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• 1998

Star tracker placement configuration is proposed and the properness of the placement configuration is verified for star tracker's sun avoidance angle requirement. Precision attitude determination system is successfully designed using a gyro-star tracker inertial reference system for a candidate LEO spacecraft. Elaborate kalman filter formulation for a spacecraft is proposed for covariance analysis. The covariance analysis is performed to verify the capability of the proposed attitude determination system. The analysis results show that the attitude determination error and drift rate error are good enough to satisfy the mission of a candidate spacecraft.

• 한국산학기술학회논문지
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• 제19권12호
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• pp.237-245
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• 2018

본 연구는 인형을 이용한 아이돌보기가 간호대학생의 피임태도, 성태도, 미혼모 인식에 미치는 효과를 확인하기 위한 연구이다. 비동등성 대조군 전후 유사실험설계를 사용하였다. 연구의 참여자는 연구 참여에 동의한 간호대학생으로 총 104명이었다. 대조군은 강의식 성교육을 실시하였고, 실험군은 강의식 성교육과 인형을 이용한 아기돌보기를 실시한 후 피임태도, 성태도, 미혼모 인식을 조사하였다. 자료수집 기간은 2017년 9월부터 12월이었다. 수집된 자료는 SPSS 21.0을 이용하여 실수와 백분율, 평균과 표준편차, ${\chi}^2$-test, t-test로 분석하였다. 인형을 이용하여 아기돌보기를 한 실험군은 대조군보다 피임태도가 높았으며 통계적으로 유의하게 나타났다(t=4.66, p=<.001), 인형을 이용하여 아기돌보기를 한 실험군은 대조군보다 성태도가 통계적으로 유의한 차이가 있었으며(t=-2.23, p=.028) 특히, 쾌락유희성이 통계적으로 유하게 감소하게 나타났다(t=3.96, p=<.001). 미혼모 인식은 인형을 이용하여 아기돌보기를 한 실험군과 대조군에서 통계적으로 유의한 차이가 없었다(t=-0.08, p=.937) 이상의 연구결과를 통해 볼 때, 인형을 이용한 아기돌보기가 피임태도와 성태도에 긍정적인 영향을 미치는 것을 알 수 있었다. 추후에는 효과적인 성교육을 위해서는 강의식 성교육 외에 다양한 교육방법의 활용이 요구되었다.

• 한국보건간호학회지
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• 제29권1호
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• pp.18-28
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• 2015

Purpose: This study was conducted to evaluate the effect of CPR education on the knowledge, attitude and self-efficacy of elementary and middle school teachers. Methods: After obtaining informed consent from participants, data were collected from 75 teachers receiving training in emergency care using questionnaires before and after education. Data were analyzed using percentage, paired t-test, and correlation. Results: The knowledge and self-efficacy scores were the middle level and the scores for attitude were the upper middle level. The knowledge, attitude, and self-efficacy scores at posttest were significantly higher than those at pretest. Conclusion: Teachers should receive CPR education regularly, so that they can acquire the knowledge, attitude, and practical ability of CPR.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.141.5-141
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• 2001

An attitude GPS receiver with 3 antennas obtains 3-dimensional attitude using GPS carrier phase measurement INS obtains the 3 dimensional navigation solution for IMU consisting of accelerometers and gyro. Ground-alignment process for the low -cost INS cannot be performed well due to the large sensor noise. Using the standard GPS receiver, however, continuous in-flight alignment for the INS becomes possible, and consequently, the errors in IMU sensors and navigation solution can be compensated. Especially with attitude measurement from the attitude GPS receiver, the compensation of errors in gyroscope and attitude would be done respite of the vehicle´s dynamics and their error covariance would be reduced. This paper presents ...

• 제어로봇시스템학회논문지
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• 제11권7호
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• pp.621-626
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• 2005

With precise GPS carrier positioning result, we can get attitude information if GPS antenna has adequate attaching position on the vehicle. In this case, baseline length information can be bandied as an additional measurement or constraint. In this paper, we have proposed a method to improve the attitude accuracy. To overcome nonlinearity of baseline observation model, we analyze attitude estimation result using existing estimation method like a least square method and Kalman filter, and apply a new nonlinear estimation method an unscented Kalman filter Finally we confirm the improvement of attitude estimation result in the case of appling the unscented Kalman filter.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.274-277
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• 2002

This paper deals with the attitude determination using GPS carrier phase. The main factors on attitude reliability are accuracy, error factors and the real-time ambiguity resolution speed. Firstly, these factors are reviewed. And then, the attitude reliability is improved by applying the averaging method. Finally, the attitude determination software is verified by the experiments. The accuracy of the proposed attitude determination method is 0.013$^{\circ}$ PE in live test. This result is more accurate than the existing INS equipment.