http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
초고속 카메라 기반 가시광 통신을 위한 거리별 측정 데이터 및 분석
서현욱(HyunWook Seo),안강일(Kang-Il Ahn),김주영(Ju-Young Kim),오준규(JunKyu Oh),임해용(Hae-Ryong Lim),정성윤(Sung-Yoon Jung),장자순(Ja-Soon Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
We propose a analysis and measured data depend on distance for visible light communication based on high speed camera at intersection for ITS. In this paper, the communication between high-speed camera and a LED rear lamp is approached using LED rear lamp as the transmitter, and high-speed camera as the receiver. The LEDs in the transmitter are emitted with 4000Hz and the images of those emitting LEDs are captured with 8000fps by a high-speed camera for conducting asynchronous communication method. And experimental results using appropriate images and figures showed the effectiveness for the proposal.
초고속 카메라와 삼차원 표면 측정기를 이용한 삭마 재료의 정량적 표면 침식 분석
최화영(Hwa Yeong Choi),노경욱(Kyung Uk Roh),천재희(Jae Hee Cheon),신의섭(Eui Sup Shin) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.9
본 논문에서는 초고속 카메라와 삼차원 표면 측정기를 이용하여 삭마 재료의 표면 침식량을 정량적으로 분석하였다. 대기권 재진입 환경을 모사하기 위해 0.4 MW 아크 가열 풍동을 이용하여 흑연과 탄소/페놀릭 복합재료의 삭마 실험을 수행하였다. 초고속 카메라를 이용하여 실시간 삭마 실험 영상을 획득하고, 이를 분석하여 침식량과 침식률을 산출하였다. 또한, 삼차원 표면 측정기를 이용하여 삭마 전후 시편의 표면 형상을 측정하였으며, 시편의 높이 차이로부터 침식량 분포를 정밀하게 산출하였다. 이를 통해 표면 침식 현상을 종합 분석하는데 있어서 두 측정 결과를 상호 보완하는 것이 유효함을 확인하였다. In this paper, the surface recession of ablative materials was quantitatively analyzed using a high-speed camera and a three-dimensional profilometer. The ablation tests of the graphite and carbon/phenolic composite samples were performed using a 0.4 MW arc-heated wind tunnel for simulating the atmospheric re-entry environment. The real-time images during the ablation test were captured by the high-speed camera, and analyzed to calculate the surface recession and recession rate. Also, the surface data of samples were obtained using a three-dimensional profilometer, and the surface recession was precisely calculated from the difference of height between the surface data before and after the test. It is effective to complement the two measurement results in the comprehensive analysis of surface recession phenomena.
김상일(Sang-il Kim),박성철(Sung-chul Park),김정호(Jung-ho Kim),권순철(Soon-chul Kwon),이승현(Seung-hyun Lee) 한국디지털콘텐츠학회 2014 한국디지털콘텐츠학회논문지 Vol.15 No.3
4K high speed camera shooting enables shooting of fast subjects in Full HD 4 times resolution without motion blur due to increase in resolution and shutter speed. However, this shooting incurs several limitations including focus, intensity of radiation and increase in data quantity. As lack of intensity of radiation may occur due to increased shutter speed, it is shoot by opening aperture and limitation in focusing follows. In addition, there is limitation in shooting records since it has restriction in storage due to increased resolution and frame rate. In this regard, this study aims to analyze the limitations shown above through production case of 4K high speed camera (Phantom Flex 4K) and to design effective workflow to overcome this.
미세먼지 제거를 위한 객체 추적 기반 정전분무 액적 특성 분석
정민규(Minkyu Jung),김소연(Soyeon Kim),구돈익(Donik Ku),배수진(Soojin Bae),김민성(Minsung Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
A phenomenon of which liquid atomized into small droplets when subjected to high electrostatic potential difference is called electrospray. The cone-jet mode, which generates a stable cone and fine monodisperse droplets has been mostly focused. However, flowrate condition of the cone-jet mode were limited at only few microliter/min scale to prevent corona discharge. In the electrospray mode for dust removal, high flowrate condition about several milliliter/min is used to obtain sufficient liquid-to-gas ratio. In this high flowrate condition, the applied voltage required to atomize the liquid increases, and 2D and 3D spraying mode that have not been shown in previous studies appears. In this study, the electrospray droplet diameter at high flowrate condition was measured using a high-speed camera. Image processing algorithm was employed in order to measure the droplet diameter from pixel of the original image. Bias by the difference in the probability of being included in the image depending on the droplet velocity, was corrected using object tracking method. Corrected droplet diameter distribution of each spraying mode under high flowrate condition was measured.
LED 후미등 및 초고속 카메라를 이용한 차량간 통신알고리즘
김주영(Ju-Young Kim),서현욱(Hyun-Wook Seo),안강일(Kang-Il Ahn),오준규(Jun-Kyu Oh),임해용(Hea-Ryong Lim),정성윤(Seung-Yoon Jung),장자순(Ja-Soon Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
We propose an efficient vehicle-to-vehicle communication algorithm that uses LED rear lamp as a transmitter and the high-speed camera as a receiver. Visible light communication is a wireless communication method using luminance, transmitting vehicle information data by emitting light. In this paper, LED transmitter is modulated by using 8-pulse position modulation scheme and the high-speed camera is used as a receiver for demodulating the signals by using image processing techniques. We performed examination of the transmission speed according to the our communication system. The actual proof experiment of the proposed system was conducted under the laboratory conditions.
광학계측 및 유량-강우량 보정기법을 통한 강우시험기 개발
강태엽 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.3
In order to guarantee reliability of the environmental testing on defense systems, it is important to use test equipment that meets requirements of the related test standards. Especially with regard to the rain test method in MIL-STD-810G w/change 1, the latest standard, it has been highly needed to introduce a novel technique and system to provide droplet- size and precipitation-rate conditions. In this study, droplet-diameter spectra of various nozzles were measured by a high-speed camera. Then, a pair of nozzles were selected based on the experimental results showing the spectra lie within the range from 0.5 mm to 4.5 mm, as suggested in the rain test method. Also, the flow-precipitation rate calibration system was developed to precisely correlate the precipitation rate measured in the chamber and the flow rate into the nozzle bank. In conclusion, the rain test equipment has been successfully developed fulfilling the requirements of the test standard.
정민규(Minkyu Jung),김소연(Soyeon Kim),구돈익(Donik Ku),정상훈(Sanghun Jeong),서기정(Gijeong Seo),김민성(Minsung Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11
미세먼지 집진에 사용되는 고유량 정전분무의 경우 분무 범위가 넓고 분무 밀도가 낮은 특성에 의해 이미징 방식을 이용한 액적 크기측정이 필요하다. 본 연구는 이미징 방식을 이용한 고유량 정전분무 액적 크기 측정에서 발생하는 속도 차이에 의한 분포 오류를 수정하기 위해 수행되었다. 초고속 카메라를 이용한 가시화장치를 통해 단일 노즐의 정전분무 액적을 가시화하였고 다단 이미지프로세싱 모델을 이용해 전처리하였다. 이후 단일 프레임별 액적 데이터를 비교하는 객체 추적 알고리즘을 통해 액적 추적을 진행하였다. 일반적으로 측정한 분포를 객체 추적을 통해 수정된 분포와 비교할 때, 속도가 상대적으로 빠른 작은 액적이 이미지에 더 적게 포함되어 발생하는 분포 오류를 확인하였다. 정전분무 모드별 분포 측정 결과, 이러한 속도 차이에 의한 오류는 액적 크기 차이가 극명한 pre-whipping 모드에서 가장 잘 나타나며, 인가전압이 높아짐에 따라 감소하나 집진에 사용되는 2D 분무 이상의 모드에서도 동일한 경향을 보였다.