• 제목/요약/키워드: Development axis

검색결과 1,367건 처리시간 0.037초

The correlation of the halo mura and off-axis light leakage level in LCDs with 2D dimmable LED backlight system

  • Kwon, Jang-Un;Byun, Min-Chul;Ham, Jung-Hyun;Baek, Heume-Il;Moon, Hong-Man;Shin, Hyun-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.590-593
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    • 2009
  • In the 2D local dimmable LED backlight system, each LED segment can be controlled separately. This can enhance the contrast ratio and reduce overall power consumption of LCDs. However, an artifact such as 'halo mura' can be observed around the bright object in the dark background. This is caused by the light leakage from the bright area into the dark one. Therefore, the 'halo mura' can be more easily observed in the oblique viewing direction. Thus, in this study, the perceivable degree of the halo mura is evaluated according to the level of the off-axis light leakage of LCDs. It is found that an acceptable degree of halo mura can be obtained in 2.0 cd/$m^2$ of the diagonal light leakage. In addition, the halo mura is unperceivable under 0.7 cd/$m^2$ of the diagonal light leakage which can be achieved with optimally compensated polarizers.

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2차원 축대칭 전산해석을 이용한 초음속 로켓 제트 음향 해석 (Acoustic Analysis of Exhaust Supersonic Jet From a Rocket Motor Using 2-D Axis-symmetric Computational Analysis)

  • 양영록;전혁수
    • 한국항공우주학회지
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    • 제48권9호
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    • pp.725-730
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    • 2020
  • 본 연구는 초음속 로켓 제트 후류 전산음향 해석에 소요되는 해석 시간을 줄이기 위해 수행되었다. 해석 시간을 줄이기 위한 방안으로 초음속 제트 후류를 2차원 축대칭 문제로 가정하고 전산음향 해석을 수행하였다. 전산음향 해석 결과, 음향하중 계측 결과와 유사한 결과를 보였다. 본 연구를 통해 2차원 축대칭 전산해석을 이용하여 초음속 로켓 제트 후류의 음향하중 예측이 가능함을 확인할 수 있었다.

화상처리법을 이용한 어체 크기 선별기의 개발 (Development of a Fish Size Grading Machine Using an Image Processing Method)

  • 김상봉;김환성;김성규;전양배
    • 한국수산과학회지
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    • 제31권3호
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    • pp.317-322
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    • 1998
  • Generally, the conventional fish size grading methods just adopt the mechanical technique. So the grading methods have a problem such that the graded fish is easy to hurt on the skin and in the internal organs. In this paper, a fish size grading machine is developed using an image processing method. The grading method is based on the principal axis theorem. The length and projected area of a fish are obtained by getting the principal axis and the product of inertia moment on the captured image of a target fish. The developed machine uses an uncontact technique that the target fishes go through the front side of the CCD camera. So the above stated problem can be improved. The performance of this method is discussed with the experimental results.

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3축 가속도 센서를 이용한 u-헬스케어 에이전트 시스템 개발 (Development of u-Healthcare Agent System using of 3-Axis Accelerometer Sensor)

  • 최동운;김진성;송행숙
    • 한국콘텐츠학회논문지
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    • 제10권4호
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    • pp.98-105
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    • 2010
  • 사람들의 건강에 관련된 혈당, 혈압, 활동량 등을 생체 센서를 이용하여서 생체 정보를 획득하고, 건강상태를 모니터링하기 위한 시스템을 개발하기 위한 연구가 많이 되고 있다. 본 논문에서 생체 정보를 모니터링하여 분석하는 u-헬스 케어 에이전트 시스템을 개발하였다. 활동량 측정은 3축 가속도계 센서 기술을 이용한다. 3축 가속도 센서에서 획득되는 정보를 이용하여 활동량을 분석하여 정확한 활동량을 계산하는 알고리즘을 개발하였다. 기존 시스템들 보다 더 정확한 소모 칼로리를 계산하고, 이를 데이터베이스에 저장 관리한다. 또한 활동량과 생체 정보를 활용하여 건강 상태를 점검할 수 있다.

사람 보행시 발바닥의 힘정보를 측정하기 위한 지능형 신발시스템 개발 (Development of lntelligent Shoe System to Measure Applied Force/Moment on the Sole of a Foot during Human Walking)

  • 김갑순;김현민;허덕찬
    • 한국정밀공학회지
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    • 제25권7호
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    • pp.79-86
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    • 2008
  • This paper describes the development of wearing intelligent shoe system to measure applied forces and moments (ground reaction forces and moments) on the soles of feet during human walking. In order to walk safely, robot must get the intelligent feet with 6-axis force/moment sensors (Fx sensor (x-direction force sensor), Fy sensor, Fz sensor, Mx sensor (Mx : x-direction moment sensor), My sensor, and Mz sensor) and detect the forces and moments data from the sensors. And the feet must be controlled with the data and controllers. While a human is walking, the forces and moments should be measured and analyzed for robot's intelligent feet. Therefore, the wearing intelligent shoe system should be developed. In this paper, four 6-axis farce/moment sensors and two high speed measuring devices were designed and fabricated, and the wearing intelligent shoe system was made using these. The characteristic tests of the wearing intelligent shoe system were performed, and the forces and moments were detected using it.