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.

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.

고상법으로 합성한 YVO₄:Eu³⁺ 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.

압축성 유체 內 탄성 외팔보의 유체-구조 상호작용

장재영(Jae Young Jang),문영준(Young J. Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

Fluid-structure interactions(FSI) of an elastic cantilever are numerically predicted to analyze the characteristics of the cantilever and induced sound field under various cantilever properties. A moving-grid based system and 6th-order compact scheme are adopted, which is based on non-conservative form of Navier-Stokes equation. First, a flow field is simulated with an immovable cantilever. Through this simulation, the basic information of a flow instability is obtained. Then forced-vibration simulation is performed, to understand the behavior of the elastic cantilever. After these simulations, FSI results are shown, which is treating both the flow field and the elastic cantilever simultaneously. These results report that the movement of beam reduces sound considerably.

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℃.

알코올 간질환 및 비알코올 지방간질환

장재영 ( Jae Young Jang ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.2

염증성 장질환에서 위험인자로서 흡연의 역할 단일기관 연구

장재영 ( Jae Young Jang ),김효종 ( Hyo Jong Kim ),정지헌 ( Ji Heon Jung ),채명종 ( Myung Jong Chae ),김남훈 ( Nam Hoon Kim ),이상길 ( Sang Kil Lee ),주광로 ( Kwang Ro Joo ),동석호 ( Seok Ho Dong ),김병호 ( Byung Ho Kim ),장영운 ( 대한소화기학회 2006 대한소화기학회지 Vol.47 No.3

트랩 형태 스냅핏의 체결력에 대한 간략 계산 방법에 관한 연구

장재영(Jae Young Jang),정인준(In Jun Jung),박유진(You Jin Park),이춘열(Choon Yeol Lee),신동길(Dong-kil Shin) 대한기계학회 2020 大韓機械學會論文集A Vol.44 No.9

본 연구에서는 트랩형 스냅핏의 체결력 산출을 위하여 이론해와 수치 해석을 연계한 간략 계산방법에 관하여 연구하였다. 스냅핏의 체결 과정을 경사면에서의 힘 평형 관계식으로 모델링하고, 체결 시 스냅핏의 거동을 고려하여 트랩형 스냅핏에 합당하도록 이론해를 수정하였다. 체결력 계산 시 필요한 후크의 수직 하중은 동일 조건에 대한 간단한 선형 정적 유한요소 해석을 통하여 산출한 처짐 강성으로부터 계산하였다. 실제 제품에 대하여 적용하여 검증한 결과, 후크 헤드의 처짐 강성은 선형 정적 유한요소 해석 결과와 실험적 측정값이 일치하였다. 스냅핏 체결력은 간략 계산 방법, 실측값, 복잡한 비선형 동적 유한요소 해석 방법 모두 유사한 결과를 나타내었다. 스냅핏의 치수를 임의로 변경하여 간략 계산 방법을 적용한 결과, 비선형 동적 유한요소 해석과 비교한 결과와 잘 일치하였다. 개발된 방법은 스냅핏 설계에 효율적으로 활용이 가능하였다. In this study, a new simplified method for calculating the assembly force of a trap-type snap-fit was proposed. The method consists of an analytic solution and a simple finite element analysis (FEA). The analytic solution was modified from the force balance equation for a slope. The downward force was calculated using the deflection stiffness obtained from the simple linear elastic static FEA. The proposed method was verified by analyzing a real snap-fit product. The deflection stiffness from the experimental measurement agreed well with the simple FEA result. The assembly forces from the simplified method, the experimental measurement, and the nonlinear dynamic FEA agreed well with each other. The proposed method was applied to various types of snap-fit design and was found to easily and accurately calculate the assembly force.

팔맥교회혈(八脈交會穴) 중(中) 열결(列缺),조해(照海)의 배합(配合)에 관한 문헌(文獻) 연구(硏究)

장재영 ( Jae Young Jang ),박상연 ( Sang Yeon Park ),홍정아 ( Jung A Hong ),장재익 ( Jae Ik Jang ),김경식 ( Kyung Sik Kim ),김재효 ( Jae Hyo Kim ),손인철 ( In Chul Sohn ) 대한경락경혈학회 2006 Korean Journal of Acupuncture Vol.23 No.4

Objectives: The aim of this study was to analyze how to treat various symptoms through the combination of Yoelgyoel (LU7) and Johae (KI6), according to reviewing the contents and data since Ling Shu (靈樞經) to recent Literatures including thirty-five medical books. Methods: It was arranged and considered that the Location, needling, and symptoms of each acupoint were described in various Literatures before the publication of Chim Kyung Ji Nam (鍼經指南). Through various Literature since the publication of Chim Kyung Ji Nam, it was examined how to be recognized and be referred about Yoelgyoel (LU7) and Johae (KI6). Results and Conclusions: The Location of Yoelgyoel is the superior 1.5 cun at wrist joint striation, medial of extensor carpi radialis Longus; the Location of Johae is the depression part under foot medial condyle. Yoelgyoel is often used for respiratory organ disease, urinary organ disease, neuopsychiatory disease, musculoskeletal system disease; Johae is often used for urinary organ disease, circulatory organ disease. At Chim Kyung Ji Nam, Yoelgyoel is often used for thoraco-abdominal pain, gynecological disease, digestive organ disease; Johae is often used for abdominal pain, gynecological disease, digestive organ disease. Therefore, these points are used together for general internal disease. As well, these are not directly continuous with previous Literatures from Chim Kyung Ji Nam. The combination of Yoelgyoel and Johae have been developed to the three categories as follows; it is quoted from as it is; it is reconstructed in the form of song; it has new symptoms enlarged. Consequently, the combination of Yoelgyoel and Johae was not bind to the rule of Up-Bottom harmony (上下配合), but asserted for the rule of Ju-Eng harmony (主應配合), which add specific acupoints to the combination of Yolgyol and Chohae as the complication of the symptoms.