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Force Equilibrium-Based Safety Assessment System for Cargo Securing of Car Ferries
Kim, Younghun,Choung, Joonmo,Jo, Huisang,Lee, Kyounghoon Korean Society of Ocean Engineers 2016 Journal of advanced research in ocean engineering Vol.2 No.3
Capsize and sinking of a coastal car ferry has occurred in a Korean offshore area and has caused hundreds of human casualties. The rapid turn and improper cargo loading are inferred as the main reasons of the accident. It has motivated to develop a new system of cargo securing with improved safety of Korean coastal ferries. This paper provides a new approach regarding cargo securing safety assessment which is purely based on force equilibrium conditions, because IMO CSS is suitable for the ocean-going vessels. The mathematical formulations are presented for the new approach. This paper also introduces a newly developed safety assessment system based on the new approach. Most outstanding features are that it can utilize acceleration data produced from hydrodynamic motion analyses or assumed maximum extents of ship motion components and that securing safety assessment is simultaneously possible for unlimited number of cargoes with finite number of lashings.
쿼드로터의 실내 측위를 위한 옵티컬 플로우와 적외선 영상의 센서 융합 필터 설계
변영훈(Younghun Byeon),조은정(Eunjeong Jo),김한솔(Han Sol Kim) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
In this paper, we propose a method to estimating the indoor position of a quadrotor using an optical flow sensor and an infrared camera based on the Kalman filter. First, we compute the global coordinate of markers placed on a drone by using an image captured by a camera. Then, the optical flow sensor is employed to measure the horizontal velocity of the quadrotor. Moreover, the Kalman filter is employed to fuse the sensor data. Finally, the hardware experimental result is provided to show the effectiveness of the proposed method.
Effects of Humidity on the Electrical Conduction of λ-DNA Trapped on a Nano-Gap Au Electrode
Young-Sang Jo,Yonghan Roh,Younghun Lee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.51
We investigated the electrical properties of the lambda-phase DNA (-DNA) double helix trapped on nano-gap Au electrodes in view of the humidity eects on the conduction mechanisms. We found that the conductivity (and therefore the resistance) of -DNA strongly depended on the humidity; that is, below 80 % of the relative humidity, the resistance values rapidly increased as the relative humidity decreased. This phenomenon was reversible, and is believed to be somewhat independent of the charged carrier transport through the -DNA strands. Rather, we believe that the dominant conduction mechanism of -DNA, in which base pairs are randomly placed, is ionic conduction via proton transfer, which is consistent with the recently published results for poly(dG)-poly(dC) DNA specimens.