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경강선의 평압가공성에 미치는 조직과 가공의 영향에 대한 연구
이인섭,김동훈,김원태 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.5
Microstructure analysis and tensile test were performed to study the effects of microstructure and drawing on the flat rolling of high carbon steel wires. Critical reduction ratio in flat rolling increases due to the developed fibrous microstructure as drawing ratio increases, and is roughly proportional to the area reduction ratio in tensile test. Edge crack is formed at the angle of 45 degree to the rolling direction due to tensile stress. Critical width to thickness ratio of Stelmor treated wire is superior to that of the lead patenting treated wire. Sorbite created in the lead patenting treatment is considered to be deterious to flat rolling of wire.
이인섭,오주현,유해성,김천중 제어로봇시스템학회 2021 제어로봇시스템학회 국내학술대회 논문집 Vol.2021 No.6
Inertial navigation system(INS) provides navigation information such as position, velocity and attitude using gyros and accelerometers. Since the INS performs dead reckoning, initial information is required and the procedure is called alignment. In-flight alignment(IFA) estimates navigation errors using the measurement of external sensors and the inertial data in moving condition. To improve navigation accuracy, it is necessary to minimize alignment errors. When the INS/GNSS integrated system performs IFA, if the vehicle performs a sudden maneuver, the estimates of Kalman filter may change rapidly, resulting in performance degradation. In this paper, we propose a method to improve the estimated attitude error during BTT maneuvering, and this is verified through simulation.
이인섭,박종옥 한국생명과학회 2003 생명과학회지 Vol.13 No.3
육종재료를 얻기 위하여 부산·경남지역에서 수집된 재래종 옥수수 49 계통을 선발하여 본 실험을 실시하였다. 본 시료는 주성분분석을 이용하여 재래종 옥수수를 해석하고 계통분류를 실시하였던 바 다음과 같은 결과를 얻었다. 7 개의 형질을 이용하여 실시한 주성분분석에서는 제 4주성분까지를 가지고 전체 변동의 86.3%를 설명할 수 있었고, 제 2 주성분까지는 전체 변동의 67.4%를 설명할 수 있었다. 주성분에 대한 형질들의 기여율은 형질에 따라 달랐고 상위 주성분에서 켰으며 하위 주성분에서 작았다. 주성분과 형질과의 상관계수는 주성분의 생물학적 의의와 주성분에 대응한 식물체의 형을 명확히 하였는데 제 1 주성분은 식물체의 크기 및 생장기간에 관련된 주성분이었고, 제2주성분은 이삭수와 분얼수에 관련된 주성분이었다. 제 3주성분과 제 4 주성분에서는 형질간에는 유의성이 인정되지 않았다. This study was conducted to get basic information on the Korean local corn line collected from Busan City and Kyungnam Province, a total of 49 lines were selected and assessed by the principal component analysis method. In the result of principal component analysis for 7 characteristics, 67.4% and 86.3% of total variation could be appreciated by the first two and first four principal components, respectively. Contribution of characteristics to principal component was high at upper principal components and low at lower principal components. Biological meaning of principal component and plant types corresponding to the each principal component were explained clearly by the correlation coefficient between principal component and characteristics. The first principal component appeared to correspond to the size of plant and ear, and the duration of vegetative growing period. The second principal component appeared to correspond to the number of ear and tiller. But the meaning of the third and fourth principal components were not clear.
가속도계 온도안정화 상태에서 고정이득방식 자체정렬의 성능개선 방법에 대한 연구
이인섭,Lee, Inseop 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.4
For inertial navigation systems, initial information such as position, velocity and attitude is required for navigation. Self-alignment is the process to determine initial attitude on stationary condition using inertial measurements such as accelerations and angular rates. The accuracy of self-alignment is determined by inertial sensor error. As soon as an inertial navigation system is powered on, the temperature of accelerometer rises rapidly until temperature stabilization. It causes acceleration error which is called temperature stabilizing error of accelerometer. Therefore, temperature stabilizing error degrades the alignment accuracy and also increases alignment time. This paper suggests a method to calculate azimuthal attitude using curve fitting of horizontal control angular rate in fixed-gain self-alignment. It is verified by simulation and experiment that the accuracy is improved and the alignment time is reduced using the proposed method under existence of the temperature stabilizing error.