• Title/Summary/Keyword: 계측기

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Use a SDRAM to Implement an Real-Time Stereoscopic Image Converter (SDRAM을 이용한 실시간 입체영상 변환기 구현)

  • Kim, Kyong-Won;Choi, Chul-Ho;Choi, Myung-Ryul
    • Proceedings of the Korea Information Processing Society Conference
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    • 2004.05a
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    • pp.765-768
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    • 2004
  • 본 논문에서는 2차원 동영상을 SDRAM을 이용하여 실시간 3 차원 입체영상으로 변환하는 장치를 설계 및 구현하였다. 2차원 동영상에서 운동시차를 추출하여 서로 다른 원근 깊이를 갖는 입체영상을 실시간으로 생성하여 기존의 실시간 입체영상 변환기에서 물체의 운동방향과 속도에 제한은 받는 단점을 개선하였다. 본 논문에서는 깊이의 지각요인을 소개하고 기존 실시간 변환방법과 제안한 입체영상 변환 방법의 원리에 대해 설명하였다. 그리고 실시간 영상 처리를 위해 설계한 SDRAM 컨트롤러와 구현한 변환기의 성능을 기술한다.

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A Study on Electronic Circuit for Liwe-Time Correction in Multi-Channel Analyzer : Survey and Analysis (방사선 스펙트럼 계측기 (Multi-Channel Analyzer)의 Live-Time 보상회로에 관한 연구)

  • Hwang, I.K.;Kwon, K.H.;Song, S.J.
    • Nuclear Engineering and Technology
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    • v.27 no.5
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    • pp.784-791
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    • 1995
  • This paper describes the counting-loss problem for radiation measurement Multi-channel analyzers and spectrometers adopt various techniques for compensation for counting-losses in process-ing the radiation pulses from a detector. Researchers hate tried to seek the best solution for the problem. However, any absolute solution has not been reached and vendors of radiation instruments use their own algorithms individually. This survey explains the various compensation algorithms with electronic implementation approach. Shortcomings and merits of each algorithm are also reviewed and a direction is suggested of the recommendable development strategy for counting-loss compensation.

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Environmental Fatigue Evaluation of Top-Mounted In-Core Instrumentation Nozzle (상부 탑재형 노내계측기 노즐의 환경피로평가)

  • Yoon, Hyo-Sub;Kim, Jong-Min;Maeng, Cheol-Soo;Kim, Gee-Seok;Kim, Hyun-Min
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.29 no.3
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    • pp.245-252
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    • 2016
  • The development of Top-Mounted In-Core Instrumentation(TM-ICI) is an ongoing project to reduce the risk due to severe accidents by inserting the instrumentation into a reactor closure head instead of a reactor bottom head. As part of this project, environmental fatigue analyses for TM-ICI nozzle have been performed using two methods of NUREG/CR-6909 and Code Case N-761. TM-ICI nozzle is subjected to transient loads for level A, level B and test conditions that should be evaluated for a fatigue analysis. It is found that a cumulative usage factor considering reactor coolant environment for TM-ICI nozzle is evaluated as less than 1, which is ASME Code allowable criteria of a fatigue analysis.

The Whole Body Counting Experience on the Internal Contamination of $^{131}I$ at Korean Nuclear Power Plants (전신계측기를 이용한 원전종사자의 $^{131}I$ 내부방사능 측정 경험 및 개선방향에 대한 연구)

  • Kim, Hee-Geun;Kong, Tae-Young
    • Journal of Radiation Protection and Research
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    • v.34 no.3
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    • pp.121-128
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    • 2009
  • During the maintenance period at Korean nuclear power plants, internal exposure of radiation workers occurred by the inhalation of $^{131}I$ released to the reactor building when primary system was opened. The internal radioactivity of radiation workers contaminated by $^{131}I$ was immediately measured using a whole body counter and the whole body counting was performed again after a few days. In this study, the intake estimated from the record history of entrance to radiation control areas and the measurement results of air sampling for $^{131}I$ in those areas, were compared with that from the results of whole body counting. As a result, it was concluded that the intake estimation using whole body counting and air sampling showed similar results.

A Study on RF Signal generator and analyzer for battery-less wireless sensors (무전원 무선 센서 신호발생과 분석장치에 관한 연구)

  • Kang, Hee-Kuk;Lee, Sang-Cheol;Choi, Jae-Sung;Lee, Hyun;Lee, Dong-Ha
    • Proceedings of the Korea Information Processing Society Conference
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    • 2012.04a
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    • pp.884-887
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    • 2012
  • 무선 센서 네트워크 기술은 상시적으로 물리정보를 획득할 수 있기 때문에 광범위한 응용분야에서 수요가 증가하고 있다. 또한 무선 센서 네트워크에 적용되는 무선 센서 시스템은 일반적으로 배터리를 장착하여 회로에 전력을 공급해주는 방식을 사용한다. 그러나 센서가 적의 기지근처, 인체 조직내 삽입, 건물의 내벽 등과 같이 배터리를 교체할 수 없는 곳에 위치해 있는 경우, 반영구적인 사용에 제한이 있기 때문에 무전원 무선 센서의 개발이 절실히 필요하다. 특히, 이러한 센서를 새롭게 개발하고 검증하려며 센서의 주파수 특성을 분석해야 하는데 기존에는 단순한 파형만을 분석할 수 있는 일반적인 계측기를 사용할 수밖에 없었다. 따라서 본 논문에서는 기존의 계측기보다 유연성 있고 효율적으로 무전원 무선 센서의 개발과 검증이 가능하도록 신호의 모니터링과 신호발생기를 에뮬레이션하는 NI LabVIEW기반의 SAW System Analyzer와 SAW Reader Emulator 시스템을 설계하고 개발하였다.

Implementation and Verification of User Centric Constant Measurement for Pre-management of IPTV Service Quality (IPTV 서비스 품질의 사전 관리를 위한 서비스 이용자 중심의 상시 측정 방안 구현과 검증)

  • Kim, Beom-Joon;Kim, Chin-Chol;Park, Jae-Sung
    • The KIPS Transactions:PartC
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    • v.18C no.1
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    • pp.23-30
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    • 2011
  • Recently internet protocol television (IPTV) service is becoming a typical emerging service enabled on broadband networks. Through the Internet which cannot support quality of service (QoS) beyond best-effort (BE) policy, how to manage and maintain its service quality is an important and essential issue for successful deployment and settlement of IPTV service. In particular, the current measurement scheme that mostly depends on specific equipments should be replaced with one that supports realtime and constant measurement achieved on a user's own will. Therefore, this paper proposes a scheme so-called 'user centric realtime measurement' of IPTV service. The developed software, which is installed in a set-top box (STB) at a user's premise, measures and reports the quality of IPTV service in realtime. In order to verify the performance and accuracy of the developed software, a number of tests are performed comparing to the measurement values from two major measurement equipments. The result of the tests shows that the measurement by the implemented software is significantly reliable.

Numerical Study on the Pulse Heating Type Infinitesimal Liquid Mass Flow Meter (단속가열식 액체용 극소질량유량 계측기에 관한 수치해석적 연구)

  • Kim, Taig Young
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.39 no.2
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    • pp.119-124
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    • 2015
  • Numerical study on the new design of the liquid mass flow meter in infinitesimal flow rate for semiconductor production is performed. The heater and thermistor are wired on the circular tube about 0.3mm inner diameter with designed gap between them. After the time interval from the single pulse heating the thermistor reaches its peak temperature and this time interval is almost inversely proportional to the liquid mass flow rate. The axial conduction in tube wall and convection through the flow is combined. As a result, the peak temperature moving velocity is much smaller than flow mean velocity and there is no linear relationship between them. In this study, the effects of design parameters such as the tube inner/outer diameter, wired heater width, and the gap between heater and thermistor are investigated and the trends of optimization in these parameters are discussed.

A Study on the Development of Electric Signal Measuring Device Using a Smart Phone (스마트 폰을 이용한 전기신호 측정기 개발에 관한 연구)

  • Son, Young-Dal;Eun, Chang-Soo
    • The Journal of the Korea Contents Association
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    • v.17 no.11
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    • pp.9-17
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    • 2017
  • In this paper, we propose a method to develop a multimeter which is used for measuring electric signals in industrial field by using battery and display of smart phone. Most of the multimeters that are linked to existing smartphones are connected to Bluetooth, which is inconvenient for battery use and low in measurement accuracy. To improve this, we developed smart multimeter that can supply power and data at the same time by USB OTG method which can be used by sharing the power of smartphone. We also developed a smart multimeter that can measure resistance, DC voltage, current, AC voltage and current. Developed an Android app with a button that displays measurement data and can select the type of electric signal to be measured, and tests whether the manufactured system is operating normally or not. Respectively.The results of this study confirm that it is possible to fabricate a smart meter that has equal or better performance compared to existing instruments and does not require a separate power source or display, and it is expected to be a reference for the development of various smart instruments in the future.

Characteristics of Behavior of Steel Sheet Pile installed by Vibratory Pile Driver (진동타입기에 의해 시공되는 강널말뚝의 거동특성)

  • Lee, Seung Hyun;Kim, Byoung Il;Kim, Zu Cheol;Kim, Jeong Hwan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.1C
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    • pp.27-35
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    • 2010
  • Instrumented steel sheet piles being driven by vibratory pile driver were installed in granular soil deposit and behaviors of the sheet piles were investigated. One of the instrumented steel sheet pile was installed without clutch and the other was installed with clutch. Sheet pile with clutch means that of installed in connection with pre-installed sheet pile. Penetration rates of sheet piles measured from depth measuring drum has shown that interlock friction had great effect on penetration speed of sheet pile. Clutch friction shows irregular distribution along the depths of penetration and its magnitude was estimated as 19.1kN/m. According to the accelerations obtained from accelerometer, it was seen that steel sheet pile behaviored nearly as a rigid body. Efficiency factor of an isolated sheet pile was 0.42 and that of the connected sheet pile was 0.71. Shapes of dynamic load transfer curves obtained from analysis of measuring devices was similar to those suggested by Dierssen.

Case Studies on Applications of Convergence Measurement Systems at the Stages of Tunnel Construction and Maintenance (터널 시공 및 유지관리 단계 내공변위 계측시스템 적용사례 연구)

  • Lee, Dae-Hyuck;Han, Il-Yeong;Kim, Ki-Sun;Jin, Suk-Woo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.2 no.3
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    • pp.59-69
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    • 2000
  • Three-dimensional total station system which integrated the instrument with Target Pin and TEMS 3D software developed by SKEC R&D center was applied to a tunnel excavation for monitoring of convergence and crown settlement. The efficiency of the system was proved as the result in the aspects of exact monitoring and prediction of rock conditions ahead of the face. To monitor the behavior of tunnel lining at the maintenance stage, DOCS system was applied to the subway tunnel section. Such many effects as the vibration of sensors, verification of the system efficiency, the effect of test trains operation, the variation of temperature and the effect of high voltage was checked. Thus the management scheme for tunnel maintenance was laid out as a proposal.

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