• Title/Summary/Keyword: 반도체 영상

Search Result 209, Processing Time 0.021 seconds

Computer Analysis of Semiconductor Barrier Characteristics (II) (반도체 접촉장벽 특성의 컴퓨터해석(II)

  • Jong-Woo Park;Keum-Chan Whang;Chang-Yub Park
    • The Transactions of the Korean Institute of Electrical Engineers
    • /
    • v.32 no.7
    • /
    • pp.234-238
    • /
    • 1983
  • This paper presents a steady-state computer solution of one-dimensional transport equations, describing a double(metal-semiconductor-metal) contact device, involving only one type of charge carrier. Most of the assumptions and approximations which are ordinarily introduced in order to make the transport equations analytically soluble are avoided here. The results are presented mainly in the form of(a) energy contours (b) concentration contours and (c) I-V characteristics. A computation of differential system capacitance as a function of applied voltage is also presented and schematic corrections are introduced for image force effects.

  • PDF

간단한 데이터 스케줄링 기법을 이용한 2차원 DWT 처리기 설계

  • Kim, Gi-Yeong;Sin, Ho-Cheol;Lee, Sang-Beom;Kim, Yeong-Seop
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
    • /
    • 2006.10a
    • /
    • pp.174-177
    • /
    • 2006
  • 본 논문에서는 리프팅 기반의 DWT 구조의 단점을 개선하고자 플립핑(Flipping)기법과 5 단 파이프라인 구조(5 Stage Pipeline)를 적용하여 임계경로가 획기적으로 줄어든 1 차원 DWT 구조를 제안하고 이를 활용하여 JPEG2000 표준의 손실 압축 모드에서 이용되는 9/7 필터계수의 2 차원 DWT 를 수행 할 수 있도록 열 방향 DWT 처리기를 설계하였다. 2 차원 DWT 는 1 차원 DWT 의 처리 결과에 대해 열상의 열(Column) 방향으로 2 차원 처리를 수행해야 하므로 1 차원 결과를 저장하기 위한 한 영상 사이즈 만큼의 메모리 버퍼를 필요로 한다. 기존 $N^2$이 필요하던 메모리 사이즈를 14N으로 줄인 2차원 구조를 제안한다.

  • PDF

Implementation of Embedded Geo-coding System for Image's Geo-Location (영상의 위치 정보를 위한 임베디드 지오코딩 시스템 구현)

  • Lee, Yong-Hwan;Kim, Young-Seop
    • Journal of the Semiconductor & Display Technology
    • /
    • v.7 no.3
    • /
    • pp.59-63
    • /
    • 2008
  • Geo-coding refers to the process of associating data with location information, and the system deals with geographic identifiers expressed as latitude and longitude or street addresses. Although many services have been launched, there still remains a problem for users to create geo-coded photo with manually labeling GPS(Global Positioning System) coordinate or synchronizing with separate devices. In this paper, we design and implement a geo-coding system which utilizes the time and location information embedded in digital photographs in order to automatically categorize a personal photo collection. An included GPS receiver labels a photograph with its corresponding GPS coordinates, and the position of the camera is automatically recorded into the photo image header at the moment of capture. The place and time where the photo was taken allows us to provide context metadata on the management and retrieval of information.

  • PDF

Face Detection based on Video Sequence (비디오 영상 기반의 얼굴 검색)

  • Ahn, Hyo-Chang;Rhee, Sang-Burm
    • Journal of the Semiconductor & Display Technology
    • /
    • v.7 no.3
    • /
    • pp.45-49
    • /
    • 2008
  • Face detection and tracking technology on video sequence has developed indebted to commercialization of teleconference, telecommunication, front stage of surveillance system using face recognition, and video-phone applications. Complex background, color distortion by luminance effect and condition of luminance has hindered face recognition system. In this paper, we have proceeded to research of face recognition on video sequence. We extracted facial area using luminance and chrominance component on $YC_bC_r$ color space. After extracting facial area, we have developed the face recognition system applied to our improved algorithm that combined PCA and LDA. Our proposed algorithm has shown 92% recognition rate which is more accurate performance than previous methods that are applied to PCA, or combined PCA and LDA.

  • PDF

Design of Block-based Image Descriptor using Local Color and Texture (지역 칼라와 질감을 활용한 블록 기반 영상 검색 기술자 설계)

  • Park, Sung-Hyun;Lee, Yong-Hwan;Kim, Youngseop
    • Journal of the Semiconductor & Display Technology
    • /
    • v.12 no.4
    • /
    • pp.33-38
    • /
    • 2013
  • Image retrieval is one of the most exciting and fastest growing research fields in the area of multimedia technology. As the amount of digital contents continues to grow users are experiencing increasing difficulty in finding specific images in their image libraries. This paper proposes an efficient image descriptor which uses a local color and texture in the non-overlapped block images. To evaluate the performance of the proposed method, we assessed the retrieval efficiency in terms of ANMRR with common image dataset. The experimental trials revealed that the proposed algorithm exhibited a significant improvement in ANMRR, compared to Dominant Color Descriptor and Edge Histogram Descriptor.

Output Characteristics of Compact Far Infrared Free Electron Laser driven by a Conventional Microtron (마이크로트론을 이용한 소형 원적외선 자유전자레이저에서의 발진 특성)

  • ;;;;;;Gregory Kazakevich
    • Proceedings of the Optical Society of Korea Conference
    • /
    • 2000.02a
    • /
    • pp.48-49
    • /
    • 2000
  • 한국원자력연구소에서는 가속기의 직경이 70 cm이고, 마그네트론 고주파 발생장치를 사용하는 소형 마이크로트론을 이용한 원적외선 자유전자레이저를 개발하였다$^{(1)}$ . 발진 파장은 100 - 200 $mu extrm{m}$ 영역이며, 첨두 출력은 약 1 - 10 kW이다. 본 연구에서는 개발된 원적외선 자유전자레이저의 시스템 개요와 출력 특성에 관하여 살펴보았다. 최근, 반도체와 물성의 분광학연구, 생명공학연구, 광화학 반응연구, 환경감시 기술개발, 인체영상, 군사용 감시기술 개발 등의 분야에서 새로운 연구와 첨단기술개발에 필요한 원적외선 광원의 요구가 점차 높아지고 있다. 이러한 요구에 부응하기 위하여 원적외선 영역의 다양한 광원 개발이 이루어지고 있으며, 특히, 테라헤르쯔 반도체 소자를 개발하기 위한 노력이 국내외에서 활발히 이루어지고 있다. 그러나, 아직까지는 이러한 광원의 출력이 mW 이하이고, 분광특성이 나빠서 실제응용에 많은 제한이 있다. (중략)

  • PDF

Photo Image Retrieval using Geo-location Information (지리적 위치 정보를 이용한 사진 영상 검색)

  • Lee, Yong-Hwan;Kim, Young-Seop
    • Journal of the Semiconductor & Display Technology
    • /
    • v.7 no.4
    • /
    • pp.57-62
    • /
    • 2008
  • Image retrieval is one of the most exciting and rapidly growing research issues in the field of multimedia technology. This paper proposes a new method that performs search the relevant images by using query-by-example. The proposed method for search and retrieval of images utilizes the location information where the image had been taken. The system associates the photo images with their corresponding GPS coordinates that are used as metadata for searching. Experimental results show that the proposed method demonstrates better performance improving up to 59% of average recall and 49% of average precision. Moreover, we learned from the experimental results geo-location information embedded within the image header is more effective and positive on the search and storage.

  • PDF

Vehicle License Plate Recognition System Using Image Binarization and Template Matching (영상 이진화와 템플릿 매칭을 이용한 자동차 번호판 인식 시스템)

  • Oh, Soojin;Park, Chun-Su
    • Journal of the Semiconductor & Display Technology
    • /
    • v.13 no.2
    • /
    • pp.7-12
    • /
    • 2014
  • A vehicle license plate includes the most important information for recognition and classification of the vehicle. In this paper, we propose a vehicle license plate recognition system using image binarization and template matching. In the proposed system, an image of the vehicle license plate is converted into a gray scale image and the gray image undergoes the binarization process. Finally, the numbers on the plate are extracted from the binary image using the template matching algorithm.

Parallel Processing based Image Identifier Generation (병렬처리 기반 정지영상 인식자 생성)

  • Ko, Mieun;Park, Je-Ho;Park, Young B.;Seo, Wontaek
    • Journal of the Semiconductor & Display Technology
    • /
    • v.16 no.1
    • /
    • pp.6-10
    • /
    • 2017
  • Recent enhancement in the still image acquisition devices has been widely perpetrated into the daily life of the common people. Due to this trend, the voluminous still images, that are produced and shared in the personal or the massive storage, need to controlled with effective and efficient management. The human-devised or system-generated still image identifiers used for the identification of the images are at risk in the situation of unexpected changing or eliminating of the identifiers. In this paper, we propose a parallel processing based method for still image identifier generation by utilizing the still image internal features.

  • PDF

Video Editing System Considering Smart Phone Playback Environment (스마트폰 재생환경을 고려한 동영상 편집 시스템)

  • O, Junsol;Lee, Hyunjung;Park, Chun-Su
    • Journal of the Semiconductor & Display Technology
    • /
    • v.16 no.1
    • /
    • pp.75-80
    • /
    • 2017
  • Nowadays, smart phone is being popularly used for communication, entertainment, and information retrieval. While demands on video traffic over mobile networks increases sharply, the wireless link capacity is often limited to fully support the traffic demand. Therefore, the size of video data needs to be reduced to provide high quality video with limited capacity. To handle this issue, we propose a video editing system using the ffmpeg library. The proposed system can provide a high quality video with a relatively small data size, thereby facilitating the mobile streaming services and live-video games.

  • PDF