• Title, Summary, Keyword: speed monitoring displays

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

  • Lee, Sang-Soo
    • Journal of the Korean Society of Safety
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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.

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

  • Shin, Dong-Youn
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.6
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    • pp.525-532
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    • 2017
  • The development of an inkjet-based manufacturing machine for the production of next-generation displays using organic and quantum-dot light emitting diodes at a low cost has been conducted. To employ inkjet printing in production lines of displays, the development of a high-speed inkjet-monitoring device to verify the reliable droplet jetting status from multiple nozzles is required. In this study, an inkjet monitoring device using a rotatable mirror with rotary and linear ultrasonic motors is developed in place of a conventional, linear reciprocating, motion-based inkjet monitoring device. Its performance is also demonstrated. The measurements of circular patterns with diameters of $10{\mu}m$, $30{\mu}m$, and $50{\mu}m$ are performed with the accuracies of $0.5{\pm}1.0{\mu}m$, $-1.2{\pm}0.3{\mu}m$, and $0.2{\pm}0.5{\mu}m$, respectively, within 17 sec. By optimizing the control program, the takt time can be reduced to as short as 8.6 sec.

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

  • 김석원;김영국;백광선;김진환;한영재
    • Proceedings of the KSR Conference
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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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Design and Implementation of A Display system for a Visual Monitoring system supporting multichannel display in multi screen division display modes (다채널 및 다중 화면 분할 모드를 지원하는 영상 감시 장치의 디스플레이 시스템 설계 및 구현)

  • 정연권;정선태
    • Proceedings of the IEEK Conference
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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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Development and Application of Integrated Settlement Management System for Construction and Maintenance of Concrete Railway (콘크리트 궤도의 시공 및 유지관리를 위한 침하관리 통합 시스템의 구축 및 활용)

  • Woo, Sang-Inn;Chun, Sung-Ho;Chung, Choong-Ki;Lee, Il-Hwa;Kwon, Oh-Jung
    • Proceedings of the KSR Conference
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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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On the Development of Speed Trial Data Measurement and Processing System (속력시운전 데이터 계측 및 분석 시스템 개발)

  • Man-Cheol Han
    • Journal of the Society of Naval Architects of Korea
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    • v.31 no.2
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    • pp.22-28
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    • 1994
  • A data acquisition and processing system. using an IBM PC, an AD converter, and a printer, has been developed to monitor rapidly and significantly varying signals. The sister takes live signals and computes and displays the trend of the moving averages of the signals in real time. The system has been applied to monitor the shaft horsepower and revolution and the speed of ships for their speed trial. The reliable interpretation of the measured data using moving average can eliminate unnecessary arguments between the owner and yard on the performance of the newly built ships. Other applications of the system-inspection of engine hunting, providing data for ship maneuvering analysis, vibration data analysis, extending to the ship performance monitoring system-are also demonstrated and discussed.

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

  • Kim, Jong-Kyu;Lee, Sang-Nam;Kang, Yong-Heack
    • Journal of the Korean Solar Energy Society
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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/$m^2$.