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경골형 교량거더의 비틀림에 의한 말뚝연결부 응력저감기법
김재형(Kim, Jae-Heong),윤경민(Yun, Kyung-Min),윤기용(Yoon Ki-Yong),이진옥(Lee, Chin-Ok),임남형(Lim, Nam-Hyoung) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4
조립식지그재그 형태의 단일거더시스템이 적용되는 경골형 교량은 비틀림에 취약한 구조이다.특히 거더와 PHC(PretensionedspunHighstrengthConcrete)말뚝의 고정 연결부는 비틀림 하중에 의한 과도한 응력이 집중되는 취약부 이므로 이를 저감시키기 위한 방안이 요구된다.본 연구에서는 연결부에 발생하는 과도한 응력을 저감시키기 위한 다양한 보강재 형식의 효율성을 수치해석적으로 평가하였다. A fish-bone type bridge is vulnerable to the torsional behavior due to the single girder system with planar zigzag conformation. The fixed connecting area between the girder and pier is the special weak point because the torsional load creates excessive stress concentration. Therefore, the method to reduce the stress concentration is required. In this study, the reduction efficiency of various reinforcing types to reduce the excessive stress occurring at the connecting area is evaluated by using numerical analyses.
3축 가속도 자이로 센서를 이용한 속도값 산출 알고리즘
김기운(Ki-Un Kim),이희열(Hee-Yeol Lee),라승탁(Seung-Tak Ra),고태영(Tae-Young Ko),곽동훈(Dong-Hoon Kwak),김재형(Jae-Heong Kim),이영지(Young-Ji Lee),김홍직(Hong-Jik Kim),성재민(Jae-Min Seong),이승호(Seung-Ho-Lee) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
In this paper, we propose an algorithm that corrects the acceleration value by calculating the gravity acceleration value applied to each axis by using the angle value according to the gravity acceleration. First, acceleration and angular velocity are measured using a 3 - axis acceleration gyro sensor. Second, the measured value of the 3-axis acceleration gyro sensor integrates the angular velocity and measures how tilted it is in real time.Third, after measuring the angle, the acceleration must be subtracted from the gravitational acceleration. At this time, the degree of influence of gravitational acceleration varies depending on the inclined angle, so it should be subtracted in consideration of the angle.Fourth, integrating the value obtained by subtracting the value of gravitational acceleration in consideration of the angle makes it possible to obtain the speed value having the direction, not the speed value having only the size. Experimental results confirm that the acceleration value obtained by subtracting the gravitational acceleration from the measured value of the 3-axis acceleration gyro sensor and the speed value obtained by integrating the measured value can obtain the normal speed value, proving the efficiency of the proposed algorithm in this paper.
곽동훈(Dong-Hoon Kwak),이희열(Hee-Yeol Lee),라승탁(Seung-Tak Ra),고태영(Tae-Young Ko),김재형(Jae-Heong Kim),이영지(Young-Ji Lee),김기운(Ki-Un Kim),김홍직(Hong-Jik Kim),성재민(Jae-Min Seong),배유경(Yoo-Kyung Bae),이승호(Seung-Ho Lee) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
In this paper, we aim to develop various nuclide analysis systems for moving objects. The nuclide analysis system consists of nuclide analysis (NaI (Ti) Scintillator) and 1 channel MCA Board. Many nuclide analysis algorithms have different bandwidths according to different nuclides. When compared with the spectrum in the background, it is judged that the nucleus exists if the energy level is higher than the background state in the corresponding bandwidth. In this case, the threshold value, which is a criterion to be determined at this time, may be changed in accordance with the total amount of the nuclides, thereby reducing the false detection rate. As a result of various radionuclide tests, discrimination of the radionuclides by the threshold value was performed smoothly in the <SUP>60</SUP>Co region and <SUP>137</SUP>Cs region. Thus, the utility of the proposed system has been demonstrated.