• 제목, 요약, 키워드: speed monitoring displays

검색결과 7건 처리시간 0.038초

어린이보호구역에 과속경보시스템 적용에 따른 장기적 속도변화 평가 (Assessment of Long-Term Effectiveness of Speed Monitoring Displays on Speed Variation)

  • 이상수
    • 한국안전학회지
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    • v.21 no.3
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    • pp.107-113
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    • 2006
  • Speeding is one of major causes of frequent and severe traffic accidents in school zones. In this paper, the long-term effectiveness of speed monitoring displays (SMD) on speed variability was investigated through a field study in a school zone environment. The performance difference was discussed with several dependent variables including average speed, 85th percentile speed, and distribution of speed. Study results showed that the speed of vehicles began to reduce where the driver recognized the presence of an SMD, and about 12.4 percent (5.8km/h) of average speed was reduced at the SMD location. This speed reduction was observed throughout the day regardless of time of day. Statistical tests showed that the speed difference was statistically significant. In addition, analysis results of speed distribution showed that the number of speeding vehicle was greatly reduced after the SMD was installed, and 85th percentile speed also decreased from 54.3km1h to 45.0km/h. Therefore, it was concluded that the application of SMD produced a positive impact on the driver's behavior for a long period of times.

잉크젯을 이용한 디스플레이 생산을 위한 회전 미러 방식의 잉크젯 액적 모니터링 장비 및 측정법 연구 (High-Speed Monitoring Device to Inspect Inkjet Droplets with a Rotating Mirror and Its Measuring Method for Display Applications)

  • 신동윤
    • 대한기계학회논문집A
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    • v.41 no.6
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    • pp.525-532
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    • 2017
  • 차세대 주력 디스플레이인 유기 및 양자점 발광 다이오드를 잉크젯을 이용하여 저렴한 비용으로 생산하기 위한 연구개발이 진행되어 왔으며, 잉크 액적의 토출 신뢰성을 고속으로 검사하기 위한 모니터링 장비의 개발이 요구된다. 본 연구에서는 기존 직선 운동 방식의 잉크젯 모니터링 장비 대신에 로터리 및 리니어 초음파 모터를 이용하여 미러를 회전시킴으로써 노즐들에서 토출되는 잉크 액적들을 모니터링할 수 있는 장비를 개발하여 측정 능력을 시험하였다. $10{\mu}m$, $30{\mu}m$$50{\mu}m$ 직경 원형의 측정 오차는 각각 $0.5{\pm}1.0{\mu}m$, $-1.2{\pm}0.3{\mu}m$$0.2{\pm}0.5{\mu}m$였다. 모니터링 시간은 17초가 소요되었으며, 제어 프로그램의 최적화를 통해 8.6초까지 모니터링 시간을 단축할 수 있는 가능성을 확인하였다.

고속철도 시운전시험 및 평가용 측정시스템 개발(I) - 하드웨어 (Development of Measuring System for On-Line Test and Evaluation of High Speed Rail(I) - Hardware)

  • 김석원;김영국;백광선;김진환;한영재
    • 한국철도학회:학술대회논문집
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    • pp.168-173
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    • 2002
  • In this paper, we introduce the hardware of the measuring system for on-line test and evaluation of high speed rail. It is composed of 6 DAMs(Data Aquisition modules), 2 monitoring modules and 1 main computer. Each of DAMs is connected many kinds of sensors, such as accelerometers, thermocouples, strain gauges, volt meters, current meter, odermeter, and measures the signals from sensors, saves it and displays it on the displayer. Two monitoring modules monitor the major signals transferred from DAMs. A main computer controls 4 DAMs(DAM1, DAM2, DAM31 and DAM32) and 2 monitoring modules and also monitors the major signals transferred from DAMs.

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다채널 및 다중 화면 분할 모드를 지원하는 영상 감시 장치의 디스플레이 시스템 설계 및 구현 (Design and Implementation of A Display system for a Visual Monitoring system supporting multichannel display in multi screen division display modes)

  • 정연권;정선태
    • 대한전자공학회:학술대회논문집
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    • pp.351-354
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    • 2002
  • DVR(Digital Video Recorder), a recently popular visual monitoring system, is required to support multi camera channel display(upto 16 channels) with various display modes in real-time. For such a multichannel display system, it is well known that tearing artifacts become more serious. Thus, one needs to design a display system for DVR so that it does not show tearing artifacts as much as possible, but keeps real-time display speed. In this paper, we present our efforts in designing and implementing a display system which rarely ever shows tearing artifacts, but without degradation of required real-time display speed, and which displays character information stably without blinking.

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콘크리트 궤도의 시공 및 유지관리를 위한 침하관리 통합 시스템의 구축 및 활용 (Development and Application of Integrated Settlement Management System for Construction and Maintenance of Concrete Railway)

  • 우상인;천성호;정충기;이일화;권오정
    • 한국철도학회:학술대회논문집
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    • pp.1196-1202
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    • 2007
  • In construction of high speed railway, the fan shape is limited to achieve reduction of required travel time and concrete railway which has structural stability and induces small maintenance cost with allowable ground settlement is recently applied. So construction of concrete railway on soft ground in which considerable ground settlement occurs increases and settlement management in soft ground section is required. Field monitoring on ground movement and integrated geotechnical information system which manages construction, design, and field monitoring data are essential for settlement management of concrete railway subgrade. Site investigation data are also required due to future repair work. Therefore in this study, integrated geotechnical information system for construction and maintenance of concrete railway is developed. The developed system consists of a database and an application program. The database contains site investigation, construction, design, and field monitoring data throughout a railway. Application program performs various functions on managing and utilizing information in the database with graphic visualization of output. And by providing integrating information with comprehensible visual displays, the applicability and effectiveness of the developed system for construction and maintenance management were confirmed.

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속력시운전 데이터 계측 및 분석 시스템 개발 (On the Development of Speed Trial Data Measurement and Processing System)

  • 한만철
    • 대한조선학회논문집
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    • v.31 no.2
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    • pp.22-28
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    • 1994
  • 본 연구에서는 개인용 컴퓨터와 신호변환기를 사용한 데이터 취득 및 분석 시스템을 개발하였다. 선박의 속력시운전시 계측되는 축마력, 축회전수, 선속등의 데이터는 여러가지 요인에 의해 변동폭이 크기 때문에 시운전이 수행되는 동안의 어느 한 순간의 값을 대표값으로 할 수가 없다. 변동폭이 큰 데이터의 대표값을 얻기 위하여 본 고에서는 이동평균 개념을 도입하였으며 이동평균값이 변하는 추이도 실시간 그래프로 보여준다. 현재는 8 채널 데이터를 동시에 처리할 수 있고, 분석된 데이터의 저장 및 프린트도 가능하다. 프로그램은 윈도우 환경에서 개발되어 사용자의 편리를 도모하고 향후의 확장이 쉽도록 하였다. 개발된 시스템은 속력시운전 뿐만 아니라 다른 분야-선박의 조종시험시 주요 데이터의 변하는 추이를 기록, 엔진의 헌팅문제의 검사, 진동의 스펙트럼 분석 등-에도 유용하며 이들 분야에 대한 실선에서의 적용 예를 보였다.

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10 kW급 접시형 태양열발전시스템 사업모델 개발 및 운전특성 분석 (Development of 10 kW Dish-Stirling System for Commercialization and Analysis of Operating Characteristics)

  • 김종규;이상남;강용혁
    • 한국태양에너지학회 논문집
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    • v.30 no.6
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    • pp.118-124
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    • 2010
  • In order to develop commercial model of 10kW dish-Stirling solar thermal power system, modification for the exiting facility was taken for a year as a Leading Project in KIER. During the project, solar tracking system, control and monitoring system and high durability reflector were developed and long term operation were performed. The solar tracking system was tested for four months to investigate the degree of precision and adapted to the control system for an actual operation from October in 2009. The sun tracking accuracy of ${\pm}4$ mrad using modified control system was obtained and the system operated successfully during the experimental period. The monitoring system displays engine pressure, electric generation amounts, generator RPM, receiver temperatures, and etc. from Stirling engine and weather data of Direct Normal Irradiation, Horizontal Global Insolation, wind speed & direction, and atmosphere temperature from weather station. According to the operating results in a clear sky day, electric power of 6,890 W was generated at the DNI value of 850 W/$m^2$ and the averaged solar-to-electricity efficiency during a whole day reached to 18.99%. From the overall operating results, linear power generation trend could be observed with increasing DNI value. The solar-to-electricity efficiency achieved to 19% around the DNI value of 700 W/$m^2$ and increased to 20% when the DNI value goes up to 900 W/$m^2$.