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.

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.

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.

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.

무선 센서 네트워크에서 이동 싱크 그룹의 분리를 지원하기 위한 라우팅 프로토콜

장재영(Jae-young Jang),윤민(Min Yoon),이의신(Euisin Lee) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.1

B형간염 바이러스의 잠재 감염 만성 C형간염에서 B형간염 바이러스 잠재 감염

장재영 ( Jae Young Jang ),박의주 ( Eui Ju Park ) 대한소화기학회 2013 대한소화기학회지 Vol.62 No.3

Occult HBV infection is defined as the presence of HBV DNA in the liver (with or without detectable or undetectable HBV DNA in the serum) of individuals testing negative for HBsAg. Studies on occult HBV infection in hepatitis C patients have reported highly variable prevalence, because the prevalence of occult HBV infection varies depending on the hepatitis B risk factors and methodological approaches. The most reliable diagnostic approach for detecting occult HBV detection is through examination of liver DNA extracts. HCV has been suspected to strongly suppress HBV replication up to the point where it may be directly responsible for occult HBV infection development. However, more data are needed to arrive at a definitive conclusion regarding the role of HCV in inducing occult HBV infection. Occult HBV infection in chronic hepatitis C patients is a complex biological entity with possible relevant clinical implications. Influence of occult HBV infection on the clinical outcomes of chronic hepatitis C may be considered negative. However, recent studies have shown that occult HBV infection could be associated with the development of hepatocellular carcinoma and contribute to the worsening of the course of chronic liver disease over time in chronic hepatitis C patients. Nevertheless, the possible role of occult HBV infection in chronic hepatitis C is still unresolved and no firm conclusion has been made up until now. It still remains unclear how occult HBV infection affects the treatment of chronic hepatitis C. Therefore, in order to resolve current controversies and understand the pathogenic role and clinical impacts of occult HBV infection in chronic hepatitis C patients, well-designed clinical studies are needed. (Korean J Gastroenterol 2013;62:154-159)

필름 연신 공정 다변량 시계열 데이터를 이용한 이상 탐지 모델 사전 연구

장재영(Jae-Young Jang),조재경(Jae-Kyung Cho),김성우(Seong-Woo Kim) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6

The Molecules of thin polymer film can be rearranged in the stretching axial direction through a stretching process to obtain optical properties as a display material. When the film is stretched, intermittent film breakages occur in the process of achieving the target draw ratio while passing through a water bath containing a continuous roller and a solution. Process variables such as temperature, solution concentration, tension, speed, and torque of each facility unit are stored and controlled in real time through facility sensors to achieve product quality specifications and stable film running. However, due to the complex non-linear relationships of multivariate data, prediction of the actual film breakages by experts is closely impossible. In this paper, we propose an unsupervised learning method that can predict the phenomena of film breakages that occur very rarely in the film stretching process using multivariate time series data collected in real time at the manufacturing site. We used two models based on LSTM which is useful for long time series data processing. They are Generative Adversarial Network (GAN) model capable of detecting abnormalities through adversarial training of normal and fake data, and Autoencoder model capable of discriminating abnormal data after feature learning using only normal data. This study, aimed at the failure alarm function in the actual industrial field, was compared and evaluated with Recall, Precision and F1-Score. Recall is the ratio of predicted breakages among actual breakages. Precision is the ratio of actual breakages among predicted breakages. F1-Score is the harmonic average of the Recall and Precision. The F1-Score of GAN and Autoencoder showed a result of 0.16 and 0.14, respectively. It shows the possibility of predicting defects even with little data.

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℃.

만성 C형 간질환에서 간내 HCV RNA 농도 측정의 임상적 의의

장재영 ( Jae Young Jang ),김연수 ( Yun Soo Kim ),김상균 ( Sang Gyune Kim ),김영석 ( Young Seok Kim ),조영덕 ( Young Deok Cho ),이준성 ( Joon Sung Lee ),진소영 ( So Young Jin ),이문성 ( Moon Sung Lee ),김주현 ( Ju Hyun Kim ),심찬섭 대한간학회 2006 Clinical and Molecular Hepatology(대한간학회지) Vol.12 No.4

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.