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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.
장민혁,강유진,조형근,박주일,송신섭,고경한,차다솜,김상우,김용범 한밭대학교 적정기술연구소 2022 적정기술 Vol.14 No.2
지속적인 산업화로 인해 산업폐수의 오염도가 점차 심해지고 있다. 이를 해결하기 위해 폐수의 종류에 따른 물리·화학적 처리에 대한 연구가 관심을 받고 있다. 최근 들어, 단일 공정뿐만 아니라, 복합공정을 통해 폐수를 더욱 효과적으로 처리 하고자하는 노력이 필수적인 상황이다. 이에 따라, 각 공정에 대한 이해와 현재 연구되어지고 있는 동향에 대한 파악이 중요하다. 본 논문은 폐수의 오염도를 나타내는 다양한 지표에 대한 설명과 고급산화공정, 막 분리 공정, 응집/응결 공정, 흡착 공정을 단일 및 복합적으로 사용한 공정을 연구한 여러 논문을 요약하여 물리·화학적 폐수 처리 공정의 전망과 연구 동향에 대한 정보를 전달하고자 한다.
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.