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장민혁,박소현,김완길,홍태환 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.6
To improve the disadvantages of Mg hydrides, a few studies were conducted for MgHx intermixed with transition metal fluorides. MgF2 formed from the MgHx-transition metal fluoride system can be replaces the initial surface oxide layer and provides a reactive and protective fluorinated surface for for hydrogen uptake. Thus, the absorption/desorption kinetics will be enhanced. In this research, MgHx-transition metal fluoride composites mixture has been prepared by hydrogen induced planetary ball milling. The synthesized powders were characterized by X-ray diffraction analysis, scanning electron microscopy and simultaneous thermogravimetric, differential scanning calorimetric analysis. The hydrogenation behaviors were evaluated by using a sievert’s type automatic pressure-composition-temperature apparatus without any activation treatment. From the characteristics of the absorption kinetics and curves observed, the role of transition metal fluoride was catalyst in hydrogen absorption. The results of Pressure-Composition Isotherm curve, available hydrogen storage amount for MgHx-5 vol% CoF2 composites were 4.85 wt%, for MgHx-5 vol%TiF3 composites were 4.88 wt%. at 623K in the 5th cycle.
이동물체 추적 시스템 구현에 있어서 최소자승법을 가미한 Voting기법 오차분석
장민혁,박종안 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.1
Optical flow method is frequently used for information estimation of multi moving objects. However, it is so difficult to get accurate solution by problem of aperture or discontinuities. In order to solve this problem, we proposed one of multi moving object tracking algorithm based on the combinatorial Hough Transform (CHT) and voting accumulation, and considered operation time and error analysis. In this paper, we extracted moving areas of moving objects from differential image using edge detection, filtering, region extension, and segmentation for each moving area. After finding real moving objects, Combinatorial Hough Transform (CHT) and voting accumulation is used to find the optimal constraint lines for optical flow estimation. From optical flow vectors, we find the absolute vector for the direction and speed of the moving objects. The simulation results show that the proposed method is very effective for extracting optical flow vectors and hence recognizing moving objects in the images. Moving objects are extracted to reduce the computation time for Combinatorial Hough Transform. The computational time is highly reduced by finding the moving objects using edge detection and segmentation. Optical flow constraints are solved using multi constraint and Combinatorial Hough Transform, which avoids the problems associated with the least-square based optical flow methods.
장민혁,김형범,김태옥,양원일,박종안 朝鮮大學校 電子情報通信硏究所 2004 電子情報通信硏究所論文集 Vol.7 No.2
본 연구에서는 관절 내시경 시스템 개발을 목표로 임상 교수들의 조언과 사용자의 편의를 우선으로 하는 PC기반 GUI 형태의 관절 내시경 시스템 설계에 초점을 맞추어 연구하였다. 관절 내시경 시스템의 성능 향상을 위한 모듈 설계하여 검증을 통한 시험 및 시뮬레이션 분석을 하였다. 또한 임상 교수의 관절 내시경 시스템 개발 참여로 사용자 중심의 편리한 시스템 구성 및 관련 H/W 및 S/W 기술 축적뿐만 아니라 PC기반 GUI 형태의 윈도우 S/W 개발로 해외 시장개척을 위한 경쟁력이 강화될 것으로 기대된다.