Gadolinia-doped ceria의 스파크 플라즈마 소결

이주신 경성대학교 공학기술연구소 2008 공학기술연구지 Vol.15 No.-

Dense Ce0 8Gd0 2O19 ceramics were prepared with commercially available powders by the spark plasma sintering method A higher density could be obtained at a lower temperature and shorter dwelling time The densification behavior was compared with conventionally sintered samples Dense Ce0 8Gd0 2O19 ceramics with 96% of the theoretical density could be obtained by the spark plasma sintering technique at 1200 C for 5min, whereas conventional sintering needed to be sintered at 1550 Cfor 5hr in order to obtain an equivalent theoretical density.

반도체초격자의 강자장물성

이주신 慶星大學校 1995 論文集 Vol.16 No.3

The electrical and optical properties of semiconductor superlattices in high magnetic fields are reviewed from the theoretical and experimental points of view. After a theoretical explanation for the two-dimensional electron system in high magnetic fields, the magnetootics and transport properties of semiconductor superlattices are summarized with typical examples of the experiments.

반도체 초격자

이주신 한국전기전자재료학회 1990 電氣電子材料學會誌 Vol.3 No.3

최근의 재료합성기술 및 미세가공기술의 발전은 종래의 천연물질에는 없는 새로운 기능을 가진 신물질이나 새로운 디바이스의 제작을 가능하게 하고 있다. 여러가지 초박막 물질의 다층막이나 초격자는 그 형상 및 물질의 조합에 따라 모체의 물질과는 새로운 성질을 나타내는 것으로 크게 관심을 모으고 있다. 본 논문에서는 현재 연구가 활발히 진행되고 있는 반도체초격자에 관하여 그 종류 및 전자상태, 결정성장 및 평가법, 기초적 물성, 디바이스 응용 그리고 앞으로의 전망을 간단하게 총망라하여 소개해 보고자 한다.

이동물체 추적을 위한 선두부 휘도 잡음 제거

이주신 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1

In this paper, we proposed the method for elimination of front-part brightness noise for the tracking moving object The detection of moving object can be obtained from the gray level difference of two sample lines on the street. In order to consider the brightness variance, we determined the brightness error margin factor and noise elimination ratio factor K. Experimental results show that resonable value of error margin factor and noise elimination ratio K are 26 and 18, respectively

3차원 이동물체의 변위평가를 위한 스테레오 비젼시스템 설계에 관한 연구

이주신 한국통신학회 1990 韓國通信學會論文誌 Vol.15 No.12

This paper described design and implementation of stereo vision system, and also, proposed method for displacement estimation of 3-D moving object using this system. The extraction of moving object is obtained by difference image algorithm. Geometrical position of 3-D moving object is calculated form the mapping of center area of two's 2-D object. 3-D coordinate position produced space depth, moving velociity, distance, moving track and proved displacement estimation of 3-D moving object. 본 논문은 스테레오비젼 시스템을 설계 제작하고, 제작된 시스템을 가지고 3차원 이동물체의 변위평가 방법을 제안하였다. 이동물체의 추출은 차영상 알고리즘에 의해 추출하고, 3차원 이동물체의 기하학적인 위치좌표는 2개의 2차원 물체의 면적중심을 합성시켜 구하였다. 3차원 이동물체의 범위평가는 합성된 3차원 좌표값에 의해서 물체의 이동속도 및 거리, 이동궤적, 카메라와 물체 사이의 공간거리를 산출하여 입증하였다.

BaTiO₃系 Ceramic Resistor의 溫度 및 電壓特性에 對한 硏究(Ⅱ)

李周信 淸州大學校 1980 論文集 Vol.13 No.1

Cermic Resistor to be stable at high temperature Ware manufactured from using BaTiO₃,SiO₂, Bi₂O₃,CuO,TiO₃, and La₂O₃ by sintering in the at 1150℃. In the system of BaTiO₃-SiO₂-TiO₂-CuO, the resistor value ranged from 2.8×10^(6) to 6.3×10^(5) (Ω-m) at the Temperature Coefficient of Resistor (N.T.C) was observed. In the system of BaTiO₃-MnO₂-Bi₂O₃, the resistor value ranged from 6.3×10³~4×10^(5)(Ω-m) at the temperature range between 30℃ to 80℃ and Positive Temperature Coefficient (P.T.C) of resistor was observed. In the case of the P.T.C and N.T.C materials were combined, a very stable resistor was obtained, regardless of temperatures and applied voltage. Also 8.8×10³-4.8×10³(Ω-m) of resistor was obtained according to the various amount of La₂O₃203 0.02㏖% added substances, at the temperature range from 30℃-80℃.

트래픽 정보 취득을 위한 고속이동물체 속도 측정

이주신,Lee Jooshin 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.11C

본 논문은 트래픽 정보취득을 위하여 영상의 라인 샘플링을 이용한 고속이동물체 속도 측정 알고리즘을 제안하였다. 이동물체의 트래픽 정보 취득을 위한 속도 측정은 도로에 제 1 샘플라인과 제 2 샘플라인을 설정해 놓고, 물체가 샘플라인을 통과할 때 취득된 영상의 시변환 색조 데이터와 기준영상 색조 데이터 사이에서 차영상 기법으로 자동차를 검출하고, 자동차가 두 샘플라인 사이에 거리를 통과할 때 점유하는 프레임수로 속도를 측정하였다. 제 1 샘플라인과 제 2 샘플라인에서 각각 검출된 자동차의 색조로 동일성 판별을 하였다. 제안된 방법의 타당성을 검토하기 위하여 주행하는 자동차를 대상으로 동일성 판별 및 속도 측정을 한 결과, 동일성 판별은 두 개의 샘플링 라인을 통과하는 자동차의 색조 데이터로 판별됨을 보였고, 자동차의 속도 측정은 X-밴드 속도 측정 시스템과 비교한 결과 3% 이내임을 보였다. In this paper, velocity measurement of fast moving object for traffic information acquisition using line sampling of image is proposed. Velocity measurement for traffic information acquisition of moving object is that the first sample line and second sample line on the road is set, then car is detected by using difference image method between time-variance hue data of image when car is passing two sample lines and hue data of the reference image, and velocity of the car is measured by using frame number of video which is occupied by two sample lines. Identification of the car is performed by hue of the detected car between the first sample line and second sample line, respectively To examine the propriety of the proposed algorithm, identification and velocity measurement for driving car is evaluated. The evaluated results is that it is identified by hue data of car passing two sample lines, and the velocity measurement for driving car is less than 3% comparing with X-band speed gun.

중첩된 영상의 윤곽선 분석을 이용한 이동벡터검출

이주신 청주대학교 2012 産業科學硏究 Vol.29 No.2

In this paper, a method of detecting moving vector by using edge analysis of overlapped image is proposed. This approach involved some basic steps to convert two-dimensional continuous images into edge images, and then to make an overlapped edge image by applying weight. A set of overlapped edge images was generated by accumulating the value of edge pixel at the same coordinate. In the middle of generating overlapped images, if the accumulated value on the same coordinate exceed the critical point, then these edge pixels are eliminated from the background. Finally, given overlapped edge image of the back ground scene, if some part of areas have the most density of image pixel, this area can be treated as front parts of moving vector. In order to verify the feasibility of the proposed method, some experiments are performed with selected football game scene. It has been performed and the moving vector has been detected. The developed methodology is able to provide insight to motion detection impacts on infrastructure at lcal and global levels.

지문워터마크를 이용한 공격에 강인한 DCT 워터마킹 알고리즘

이주신 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1

In this paper, a robust DCT watermarking algorithm under attacks using a fingerprint Watermark is proposed for protecting copyrighters. A watermark is created by DCT process after it is segmented a copyrighter's fingerprint into blocks of 8×8 size. A watermarked image is created by adding the watermark to an original image. The watermark is inserted into an original image in the frequency domain, and it is reconstructed by IDCT process. DFT transform is used for transforming into frequency domain. To investigate the propriety of the proposed scheme, it is experimented with a LENA standard image. From the results of the experiment, PSNR of the watermarked images is 92.76 dB. Watermark reconstruction results are shown that the reconstructive rate is 91.97% in image scale-down, 88.46% in image rotation, 97.61% in image added Salt & Pepper noise, and 90.71% in JPEG lossy compression image.

시간솎음 알고리즘에 의한 고속이동물체 추적

이주신 청주대학교 산업과학연구소 2006 産業科學硏究 Vol.24 No.1

In this paper, the tracking of moving object by the decimation-in-time search algorithm is proposed. The proposed moving object tracking algorithm is composed of the moving direction initialization, the decimation-in-time searching algorithm and the moving object tracking. The initialization of moving direction is performed by obtaining the moving angle and the moving distance of moving objects which are detected in successive frames of the image. The decimation-in-time searching algoritlun that the moving direction of the moving object at the current frame is obtained by applying the decimation-in-time search direction mask. A prediction of the moving object on moving direction use the decimation-in-time search direction mask which is decided by obtaining the moving angle in the 8 way of search directions. The tracking of moving object is that the frames are decimated in image sequence by utilizing the decimation-in-time search direction mask, then the moving direction of the moving object is predicted. The results of the moving object tracking show that displacement coordinates error of the moving object between the proposed algorithm and the full search algorithm is less than 2 pixels on the average. Hence, the proposed algorithm can be possible to track moving object accurately, and the number of displacement search times is reduced up to 93% on the average. The processing time of the tracking is 37.4ms on the average.