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3차원 물체의 공간정보를 이용한 임의의 집속면에 대응하는 디포커싱 영상 구현
장재영,김영일,신동학,이병국,이준재,Jang, Jae-Young,Kim, Young-Il,Shin, Donghak,Lee, Byung-Gook,Lee, Joon-Jae 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.4
본 논문에서는 집적 영상 기술을 이용하여 한 번의 획득 과정을 통하여 물체의 3차원 공간정보를 저장한 후 저장된 정보를 이용하여 집속면(focusing plane)에 대응하는 디포커싱 영상을 구현하는 방법을 제안한다. 집속면에 대응하는 ${\delta}$-함수 배열과 기본영상의 콘볼루션 연산을 통하여 집속면에 대응하는 포커싱 및 디포커싱영상을 구현하였다. 디포커싱 정도는 집속면과 물체거리의 차이에 따라 상대적으로 달라짐을 관찰 할 수 있었다. 제안하는 방법에 대한 기초적인 실험을 수행하고 그 결과를 보고한다. In this paper, we propose a method to generate defocusing images at the focusing plane using the 3D spatial information of object through pickup process of integral imaging technique. In the proposed method, the focusing and defocusing images are generated by the convolution operation between elemental images and ${\delta}$ function array. We observed the image difference by defocusing degree according to the distance of focusing plane. To show the feasibility of the proposed method, some preliminary experiments are carried out and the results are presented.
고상법으로 합성한 YVO<sub>4</sub>:Eu<sup>3+</sup> 적색 형광체의 비대칭비와 발광 특성
장재영,안세혁,방준혁,마권도,김춘수,조신호,Jang, Jae-Young,Ahn, Se-Hyeok,Bang, Jun-Hyuk,Ma, Kwon-Do,Kim, Choon-Soo,Cho, Shin-Ho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.4
$Y_{1-x}VO_4:Eu_x^{3+}$ red phosphors were synthesized with changing the mol ratios of $Eu^{3+}$ ions by using the solid-state reaction method. The crystalline structure of phosphors was found to be a tetragonal system with the maximum diffraction intensity at $25.02^{\circ}$. The grain particles showed the truncated hexagonal patterns with a very homogeneous size distribution at 0.05 mol of $Eu^{3+}$ ion. The excitation spectra of the phosphor ceramics were composed of a broad band centered at 303 nm and weak narrow multilines peaked in the range of 360-420 nm. The dominant emission spectrum was the strong red emission centered at 619 nm due to the $^5D_0{\rightarrow}^7F_2$ electric dipole transition. The experimental results suggest that the optimum doping mol ratio of $Eu^{3+}$ ions for preparing the red phosphors is 0.10 mol with the asymmetry ratio of 5.21.
병렬렌즈배열 기반의 집적영상에서 공간필터링된 3차원 영상 복원
장재영,조명진,Jang, Jae-Young,Cho, Myungjin 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.3
In this paper, we propose a novel reconstruction method of spatially filtered 3D images in integral imaging based on parallel lens array. The parallel lens array is composed of two lens arrays, which are positioned side by side through longitudinal direction. Conventional spatial filtering method by using convolution property between periodic functions has drawback that is the limitation of the position of target object. this caused the result that the target object should be located on the low depth resolution region. The available spatial filtering region of the spatial filtering method is depending on the focal length and the number of elemental lens in the integral imaging pickup system. In this regard, we propose the parallel lens array system to enhance the available spatial filtering region and depth resolution. The experiment result indicate that the proposed method outperforms the conventional method. 본 논문에서는 병렬렌즈배열 기반의 집적영상에서 공간필터링된 3차원 영상 복원법을 제안한다. 병렬렌즈배열은 두 매의 렌즈배열을 병렬로 배열하는 획득 시스템 이다. 종래의 집적영상에서 주기적인 함수들의 컨벌루션 특성을 이용하는 공간필터링 방법의 문제점으로 인식하고자 하는 물체의 위치가 제한적이라는 단점과 이로 인해 획득 시스템에서 깊이해상력이 상대적으로 낮은 영역에 물체가 위치하여야 하는 단점이 있다. 깊이인식방법을 이론적으로 분석한 결과 깊이인식가능 영역과 요소영상에 획득된 3차원 물체의 깊이 정보는 획득시스템에 사용되는 요소렌즈의 개수와 요소렌즈의 초점거리에 따라 결정됨을 알 수 있다. 따라서 깊이인식영역과 깊이해상력을 개선 할 수 있는 방법으로 획득 시스템에 두 매의 렌즈배열을 병렬로 배치하는 시스템을 제안한다. 제안하는 방법에 대한 이론적 분석을 하였으며 실험을 수행하였고 그 결과를 보고한다.
집적영상에서 요소영상의 좌표변환을 이용한 정치실영상 구현
장재영,조명진,Jang, Jae-young,Cho, Myungjin 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.7
In this paper, we propose a depth conversion method for orthoscopic real image reconstruction in integral imaging. Pseudoscopic image has been regarded a problem in conventional integral imaging. the depth of reconstructed image is depending on a coordinate of an elemental image. The conversion from pseudoscopic to orthoscopic may be possible by analysing the geometrical relation between pickup and reconstruction system of elemental image. The feasibility of the proposed method has been confirmed through preliminary experiments as well as ray optical analysis. 본 논문에서는 집적영상에서 정치실영상을 재생하기 위한 깊이변환법을 제안한다. 종래의 집적영상은 재생상이 반전된 깊이로 재생되는 도치영상 문제가 있다. 재생상의 깊이는 개별 요소영상의 좌표에 의해 결정된다. 요소영상 획득과 재생시스템의 기하학적 관계를 분석하여 재생상의 깊이 변환 에 필요한 수식 유도가 가능하며 이를 이용하여 도치영상을 정치영상으로 변환할 수 있다. 제안하는 방법의 유용성을 보이고 또한 이론적 분석을 검증하기 위하여 실험을 수행하였고 그 결과를 제시한다.
장재영 ( Jae Young Jang ) 대한간학회 2018 Postgraduate Courses (PG) Vol.2018 No.1
Alcoholic liver disease (ALD) is a leading cause of liver-related morbidity and mortality. ALD encompasses a spectrum of disorders ranging from asymptomatic steatosis, alcoholic steatohepatitis, fibrosis, cirrhosis and its related complications. Moreover, patients can develop an acute-on-chronic form of liver failure called alcoholic hepatitis (AH). Most patients are diagnosed at advanced stages of the disease with higher rates of complications and mortality. The mainstream of therapy of ALD patients, regardless of the disease stage, is prolonged alcohol abstinence. The current therapeutic regimens for AH (i.e. prednisolone) have limited efficacy and targeted therapies are urgently needed.
휴머노이드와 모바일 로봇의 협조작업을 위한 진화적 동작 생성
장재영(Jae Young Jang),서기성(Kisung Seo) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.2
In this paper, a prototype of cooperative work model for multi-robots system is introduced and the evolutionary approach is applied to generate the motions for the cooperative works of multi-robots system using genetic algorithm. The cooperative tasks can be performed by a humanoid robot and a mobile robot to deliver objects from shelves. Generation of the humanoid motions such as pick up, rotation, and place operation for the cooperative works are evolved. Modeling and computer simulation for the cooperative robots system are executed in Webots environments. Experimental results show the feasible and reasonable solutions for humanoid cooperative tasks are obtained.
헬리코박터 파이로리 제균 전후의 위액 내 암모니아와 표피성장인자 농도의 변화
장재영 ( Jae Young Jang ),장영운 ( Young Woon Chong ),최선영 ( Sun Young Choi ),김남훈 ( Nam Hoon Kim ),임근우 ( Keun Woo Lim ),정용희 ( Yong Hee Jung ),한요셉 ( Yo Seb Han ),동석호 ( Seok Ho Dong ),김효종 ( Hyo Jong Kim ),김병호 대한소화기학회 2004 대한소화기학회지 Vol.43 No.5
Background/Aims: Helicobacter pylori (H. pylori) infection is the cause of peptic ulcer diseases, and gastric cancer. Hydrolysis of urea generating ammonia may cause cytotoxic effects on the gastric epithelium. The ammonia may induce the synthesis of epidermal growth factor (EGF) in gastric epithelium as an adaptive cytoprotective mechanism. The first aim was to examine the concentration of ammonia and EGF in gastric juice before and after H. pylori eradication in functional dyspepsia patients. The second aim was to examine the correlation among ammonia concentration, EGF concentration, and inflammatory score of gastritis. Methods: The concentration of ammonia and EGF were measured by ELISA. The grade and severity of gastritis were measured according to the updated Sydney system. Results: The concentration of ammonia in gastric juice was much higher in the H. pylori positive subjects (10,787±6,584㎛ol/L) than in the negative subjects (2,339±1,158㎛ol/L, p<0.0001). The concentrations of EGF in gastric juice was much higher in the positive subjects (1,462±393pg/㎖) than in the negative subjects (1,088±499pg/㎖, p<0.005). The concentration of ammonia and EGF in gastric juice showed significant correlation (r=0.63, p<0.0001). The concentrations of ammonia and histologic severities showed significant correlation (r=0.41, p<0.0001). Moreover, the level of EGF in gastric juice and histologic severities showed positive correlation (r=0.20, p<0.005). Conclusions: As the concentration of ammonia in gastric juices increased, the concentration of EGF was also increased in functional dyspepsia with H. pylori infection. The concentration of EGF in gastric juice may play a role in the adaptive cytoprotection in H. pylori- induced gastritis. (Korean J Gastroenterol 2004;43:283-290)
RF Magnetron Sputtering 법으로 제조된 LaFeO3 박막의 가스감지 특성
장재영(Jae Young Jang),마대영(Dae Young Ma),박기철(Ki Cheol Park),김정규(Jeong Gyoo Kim) 한국센서학회 2000 센서학회지 Vol.9 No.5
N/A The structural, electrical and gas sensing characteristics of LaFeO₃ thin films fabricated by r.f. magnetron sputtering method on Al₂O₃ substrates were investigated. (121) domonant crystalline plane was observed for the films heat-treated at above 600 ℃ and gas sensing properties showed p-type semiconductor behaviors. Gas sensing characteristics of the LaFeO₃ thin films was studied as a function of film thicknesses and heat treatment temperatures. While the variation of the film thickness showed a little effect on the sensitivity, the heat treatment temperature was critical to the sensitivity. The thin films with thickness of 400 nm heat-treated at 800℃ showed the sensitivity of 400% for 5000ppm CO and 60% for 350ppm NH₃ at the working temperature of 300℃.