• 제목/요약/키워드: pinhole

검색결과 208건 처리시간 0.027초

렌즈배열 모델을 적용한 3차원 집적영상 기술에서의 컴퓨터적 시점 재생 방법 (Computational view-point reconstruction method in three-dimensional integral imaging using lenslet array model)

  • 신동학;권영만;김은수
    • 한국정보통신학회논문지
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    • 제10권10호
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    • pp.1848-1853
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    • 2006
  • 본 논문에서는 3차원 집적 영상 기술에서 렌즈배열 모델을 적용하여 컴퓨터적으로 해상도가 개선된 3차원 영상을 재생하는 방법을 제안하고, 그 성능을 분석한다. 기존의 보고된 컴퓨터 적 시점 재생 방법은 핀홀 배열 모델에 기초하지만, 제안하는 방법은 렌즈 배열 모델을 적용하기 때문에 동일한 요소영상에서 다수의 픽셀을 추출하여 높은 해상도를 얻을 수 있다. 제안한 방법의 유용함을 보이기 위해 기초적인 실험을 수행하고 그 결과를 보고한다.

가공전선 경간 중간 단선고장 에 관한 연구 (A Study on the Breaking down of overhead line in the middle of span)

  • 박철배;정종만;김동명;김한홍
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.509-510
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    • 2011
  • 한국전력공사 배전선로의 가공설비(특고압)는 2011.03 현재 약 615,089 km가 설치 운전 중에 있으며 해마다 가공전선 단선 고장이 일어나고 있어, 원인 규명 및 방지대책을 강구하고 있다. 본 연구에서는 가공전선 단선사고의 일반적인 사례 LP 애자 설치개소가 아닌 선로 중간에서 단선 고장난 사고사례에 관한 것으로써 전선피복(절연체)의 두께와 impulse voltage에 따른 Pinhole 형성 그리고 단선 메커니즘에 대해서 기술하였다.

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LCTV 공간 광 변조기를 이용한 비선형 홀로그래픽 연상메모리의 광학적 실현 (Optical Implementation of Nonlinear Holographic Associative Memory using LCTV Spatial Light Modulator)

  • 황의인;이승현;이우상;김은수
    • 대한전자공학회논문지
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    • 제26권11호
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    • pp.1872-1879
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    • 1989
  • In this paper, we implement optical holographic associative memory based on the two-dimensional neural network model by using commercial LCTV as a spatial light modulator. The system consists of the simple Vander Lugt correlator utilizing plane Fourier hologram and the pinhole array. The associated output signal is detected on a two-dimensional CCD camera and electronically thresholded and fed back to the input plane of the system. Through the experimental demonstration of nonlinear holographic associative memory, it is suggested that commercial LCTV can be used as a new coherent spatial light modurator.

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Ring and Volcano Structures Formed by a Metal Dipyrromethene Complex

  • Son, Seung Bae;Miao, Qing;Shin, Ji-Young;Dolphin, David;Hahn, Jae Ryang
    • Bulletin of the Korean Chemical Society
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    • 제35권6호
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    • pp.1727-1731
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    • 2014
  • Dichloromethane liquid droplets containing a cobalt dipyrromethene trimer deposited on a graphite surface were found to form coffee ring, toroid ring, or volcano dot structures due to the redistribution of the solute during solvent evaporation. The shapes and size distributions of the ring structures depended on the drying temperature. The shape differences were attributed to the fact that the solvent evaporation rate controlled the self-assembly process that yielded the coffee stain and pinhole structures.

Vibronic Spectroscopy of Jet-Cooled Benzyl-type Radicals Produced from 2-Fluoro-4-Chlorotoluene by Corona Discharge

  • Chae, Sang Youl;Yoon, Young Wook;Lee, Sang Kuk
    • Bulletin of the Korean Chemical Society
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    • 제34권12호
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    • pp.3565-3569
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    • 2013
  • A home-made pinhole-type glass nozzle was employed to generate vibronically excited but jet-cooled benzyl-type radicals from precursor 2-fluoro-4-chlorotoluene with a large amount of carrier gas He, from which the visible vibronic emission spectrum was recorded with a long-path monochromator. From an analysis of the spectrum observed, it was found that two benzyl-type radicals, 2-fluorobenzyl and 2-fluoro-4-chlorobenzyl radicals, were formed from the precursor in corona discharge. The possible pathway for the production of benzyl-type radicals that can explain the spectroscopic observation is herein proposed. In addition, the electronic energy of the $D_1{\rightarrow}D_0$ transition and the vibrational mode frequencies in the $D_0$ state of the 2-fluoro-4-chlorobenzyl radical were determined for the first time.

Spectroscopic Identification of Isomeric Trimethylbenzyl Radicals Generated from 1,2,3,4-Tetramethylbenzene

  • Yoon, Young-Wook;Lee, Sang-Kuk
    • Bulletin of the Korean Chemical Society
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    • 제32권8호
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    • pp.2751-2755
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    • 2011
  • The visible vibronic emission spectrum was recorded from the corona discharge of precursor 1,2,3,4-tetramethylbenzene with a large amount of inert carrier gas helium using a pinhole-type glass nozzle coupled with corona excited supersonic expansion. The spectrum showed a series of vibronic bands in the $D_1{\rightarrow}D_0$ electronic transition of jet-cooled benzyl-type radicals formed from the precursor in a corona excitation. The analysis confirmed that two isomeric radicals, 2,3,4- and 2,3,6-trimethylbenzyl radicals, were produced as a result of removal of a hydrogen atom from the methyl group at different substitution positions. For each isomeric product, the electronic transition and a few vibrational mode frequencies were determined in the ground electronic state.

Isomeric Trimethylbenzyl Radicals Produced by Corona Discharge of 1,2,3,5-Tetramethylbenzene

  • Lee, Gi-Woo;Yoon, Young-Wook;Lee, Sang-Kuk
    • Bulletin of the Korean Chemical Society
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    • 제32권9호
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    • pp.3389-3394
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    • 2011
  • Isomeric trimethylbenzyl radicals were generated and vibronically excited from precursor 1,2,3,5-tetramethylbenzene, isodurene, with a large amount inert carrier gas helium in a corona excited supersonic expansion (CESE) using a pinhole-type glass nozzle. A long-path monochromator was used to record the visible vibronic emission spectra of the jet-cooled benzyl-type radicals in the $D_1{\rightarrow}D_0$ electronic transition. From the analysis of the spectra, we identified the evidence of the presence of three isomeric trimethylbenzyl radicals in the corona discharge, and obtained the electronic energy and a few vibrational mode frequencies in the ground electronic state for each isomer.

필터자동검사장치의 최적 운전 파라미터 동조를 위한 퍼지 모델링 기법의 적용 (Application of Fuzzy Modelins Scheme to Optimal Parameter Tuning of Filter Test Equipment)

  • 한윤종;육의수;김성호
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2004년도 춘계학술대회 학술발표 논문집 제14권 제1호
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    • pp.409-412
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    • 2004
  • 일반적으로 반도체 생산 라인으로부터 생산되는 제품의 수율은 반도체의 가격에 직접적인 영향을 미치는 인자로 고수율의 제품 생산을 위해서는 반도체 생산라인 내부의 공기를 청정하게 할 필요가 있으며 이를 위해 고성능의 필터들이 사용되고 있다. 이러한 필터의 재료는 초극세 섬유로 작업자의 부주의한 조작에 의해 필터 표면에 핀홀(pinhole)둥이 발생하기 쉽다. 이러한 핀홀은 육안으로 관측이 힘들뿐만 아니라 필터의 여과 성능에도 악영향을 미치는 요소로 필터 생산업체에서는 이의 검출 및 보수에 많은 인력이 투입되고 있다. 본 연구에서는 필터 표면에 발생된 핀홀을 검출할 수 있는 자동 테스트 장치를 제안함과 동시에 제안된 테스트 장치의 효율적 운영을 가능케 하는 최적 운전 파라미터를 퍼지 모델링 기법을 이용하여 튜닝하고자 한다.

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New Method of Visual Servoing using an Uncalibrated Camera and a Calibrated Robot

  • Morita, Masahiko;Shigeru, Uchikado;Yasuhiro, Osa
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2002년도 ICCAS
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    • pp.41.4-41
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    • 2002
  • In this paper we deal with visual servoing that can control a robot arm with a camera using information of images only, without estimating 3D position and rotation of the robot arm. Here it is assumed that the robot arm is calibrated and the camera is uncalibrated. Here we consider two coordinate systems, the world coordinate system and the camera coordinate one and we use a pinhole camera model as the camera one. First of all, the essential notion can be show, that is, epipolar geometry, epipole, epipolar equation, and epipolar constrain. And these plays an important role in designing visual servoing in the later chapters. Statement of the problem is giver. Provided two a priori...

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