• Title, Summary, Keyword: VXI

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Beam Crossectional Monitor of Cyclotron using VXI Bus (VXI Bus를 이용한 싸이클로트론의 빔 단면 표시장치)

  • Cho, Young-Ho;Ahn, Doo-Soo;Lee, Han-Seok;Kim, Yu-Seok;Chai, Jong-Seo
    • Proceedings of the KIEE Conference
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    • pp.442-444
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    • 1998
  • We made the beam crosssectional monitor system which was possible to display the ion beam crosssection extracted from accelerator on personal computer monitor. Previous beam profile monitor system could detect the central beam position with limited low beam current, but this developed beam crosssectional monitor system could operate at the relatively higher beam current. In addition we realized the real time data taking system by adopting the VXI system for beam size, central position and crosssection.

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KT-2 토카막 플라즈마 귀환제어계의 연구

  • 오병훈;이광원;인상렬;최현정;김성규
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.1041-1046
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    • 1995
  • KT-2 토카막 플라즈마 귀환제어계를 개념설계 하였다. 본 연구에서는 최적의 자장탐침계구성방법, 수직위치 불안정성에 대한 대책, 플라즈마 파라메타들의 실시간 계산 알고리즘 및 VXI 모듈화된 플라즈마 제어계에 대해 논의한다. KT-2 플라즈마 제어계를 VXI 모듈화된 디지탈방식으로 구성함으로서 빠르고 정확한 제어기능과 동시에 자장탐침 데이타들의 저장 및 다양한 확장성(flexibitities) 등의 기능들을 가질 수 있다.

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New Challenges for Low Cost and High Speed RF ATE System (새로운 저가형 고속 RF 자동화 테스트 시스템)

  • Song, Ki-Jae;Lee, Ki-Soo;Park, Jongsoo;Lee, Jong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.8
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    • pp.744-751
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    • 2004
  • This paper presents the implementation of the low cost and high speed RF ATE(Automatic Test Equipment) system, which can be a reasonable solution for reducing the test cost of RF devices. This paper suggests high speed and precise measurement capabilities which are realized by the 16 independent RF ports with high speed switching time and high accuracy digitizer using the industry standard Versus module eXtensions for Instrument(VXI) General Purpose Interface Bus(GPIB) interfaces. Also, the system has the capabilities of quad-site test which can dramatically increase the device throughput. This paper concludes with the demonstration of the implemented ATE system through the setup of RF Power Amplifier Module(PAM), which is under the most competitive market situation.

The Communication Method at the Auto-Startup System using TCP/IP and VXI and Expert System(G2)

  • Kim, Jung-Soo;Joon Lyon
    • Transactions on Control, Automation and Systems Engineering
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    • v.1 no.2
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    • pp.141-146
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    • 1999
  • This paper describes the communication method of an auto-startup system. The Auto-Startup system is designed to operate a nuclear power plant automatically during the startup operation . In general , the operations during startup in existing plant have only been manually controlled by the operator. The manual operation caused to the operator mistake. The Auto-Startup system consists of the Distributed Control System(DCS) and G2 (Expert System). Also, Functional Test Facility(FTF) provides the plant's real-data for an Auto-Startup system. So, it is necessary to develop the communication method between these systems. We developed two methods ; one is a network and the other is a hardwire line. To communicate between these systems (DCS-G2 and DCS-FTF) , we developed the communication program. In case of DCS-FTF, we used the TCP/IP and VXI. BUt, in case of DCS-G2 , we , what it called , developed the bridge program using the GSI(G2 Standard Interface). We test to check the function of the important parameter, in time, for analysis of the developed communication method. The results are a good performance when we check the communication time of important parameter. We conclude that Auto-startup system could save heat-up time about at least 5 hours and reduced the change of the reactor operation and trip.

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Fault Detection System by the Extracting the ROM's Data (ROM 데이터 추출을 통한 결함검출 시스템)

  • Jeong, Jong-Gu;Jie, Min-Seok;Hong, Gyo-Young;Ahn, Dong-Man;Hong, Seung-Beom
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.19 no.4
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    • pp.18-23
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    • 2011
  • Generally, the digital circuit card can be tested by automatic test equipment using LASAR(Logic Automated Stimulus and Response). This paper proposes the ROM data extracting algorithm which can test the digital circuit card that consists usually ROMs. We are implemented of the proposed fault detecting program by LabWindow/CVI 8.5 and the digital automatic test instrument with NI-VXI(National Instrument - Versa Bus Modular Europe eXtentions for Instrumentation) card. We also make an interface circuit board connecting the digital test instrument and the digital circuit card. It shows the good performance of getting the data from ROMs.

A Study on Implementation of a VXIbus System Using Shared Memory Protocol (공유메모리 프로토콜을 이용한 VXIbus 시스템 구현에 관한 연구)

  • 노승환;강민호;김덕진
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.18 no.9
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    • pp.1332-1347
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    • 1993
  • Existing instruments are composed independently according to their function and user constructed instrumentation system with those instruments. But in the late 1980s VXI bus enables to construct instrumentation system with various modular type instruments. For an VXI bus system with the word serial protocol, an increase of data size can degrade the system performance. In this paper shared memory protocol is proposed to overcome performance degradation. The shared memory protocol is analyzed using the GSPN and compared with that of the word serial protocol. It is shown that the shared memory protocol has a better performance than the word serial protocol. The VXI bus message based-system with the proposed shared memory protocol is constructed and experimented with signal generating device and FFT analyzing device. Up to 80 KHz input signal the result of FFT analysis is accurate and that result is agree with that of conventional FFT analyzer. In signal generating experiment from 100 KHz to 1.1 GHz sine wave is generated.

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A Study on the Technology Measuring Partial Discharge for Long Term Aging Experiments of Insulation Materials (장시간 절연체 열화실험을 위한 부분방전측정기술 연구)

  • Seon, Jong-Ho;Kim, Gwang-Hwa;Park, Jeong-Hu;Jo, Jeong-Su
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.12
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    • pp.665-672
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    • 2000
  • This paper described the measurement technology to analyze the partial discharge characteristics for long term aging of insulations. This system was consisted of high voltage generation and measurement part, PD detection part, digital conversion and signal processing part. We used the VXI system for digital conversion and signal processing part. In the digital conversion part, we studied the error of partial discharge magnitude and memory capacity for reading digital signal with the sampling rate. In the signal processing part, we showed the program algorithm to count pulses and read peak values of partial discharge. The allowable minimum sampling rate of digizer was decided to 250kS/s through analyzing test. We confirmed that this system was very useful in the study of $\phi-q-n$ characteristics of long term PD experiments with specimens being consisted of internal void defects and CIGRE II electrodes.

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A study on the DSP Analysis for the CAT application (CAT 응용을 위한 신호처리 분석에 관한 연구)

  • Jeon, Dong-Keun
    • The Journal of the Acoustical Society of Korea
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    • v.14 no.2
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    • pp.30-39
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    • 1995
  • In this paper, study on implementation of FFT analyzer applied to CAT, A/D conversion module, DSP module and VXIbus interface module are implemented in hardware and calculation program and control software are implemented in DSP module and VXIbus interface module, respectively. The control of the modules using PC is realized in software. The real time bandwidth of the FFT analyzing device is 100KHz. At sampling rate of 200KHz and with 2048 point FFT, the result of applying sine, triangular and rectangular wave of 20KHz to FFT analyzing device is compared with the FFT analyzed results of Hewlett-Packard 3562A dynamic output range of -40dBV- +30dBV, correct results are obtained and results of applying 10KHz, 20KHz and 50KHz input are compared and the correct values are obtained.

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Evaluation of Geometric Correspondence of kV X-ray Images, Electric Portal Images and Digitally Reconstructed Radiographic Images (kV X선 영상, 전자조사문 영상, 디지털화재구성 영상 간 기하학적 일치성 평가)

  • Cheong, Kwang-Ho;Kim, Kyoung-Joo;Cho, Byung-Chul;Kang, Sei-Kwon;Juh, Ra-Hyeong;Bae, Hoon-Sik;Suh, Tae-Suk
    • Progress in Medical Physics
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    • v.18 no.3
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    • pp.118-125
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    • 2007
  • In this study we estimated a geometric correlation among digitally reconstructed radiographic image (DRRI), kV x-ray image (kVXI) from the On-Board Imager (OBI) and electric portal image (EPI). To verify geometric correspondence of DRRI, kVXI and EPI, specially designed phantom with indexed 6 ball bearings (BBs) were employed. After accurate setup of the phantom on a treatment couch using orthogonal EPIs, we acquired set of orthogonal kVXIs and EPIs then compared the absolute positions of the center of the BBs calculated at each phantom plane for kVXI and EPI respectively. We also checked matching result for obliquely incident beam (gantry angle of $315^{\circ}$) after 2D-2D matching provided by OBI application. A reference EPI obtained after initial setup of the phantom was compared with 10 series of EPIs acquired after each 2D-2D matching. Imaginary setup errors were generated from -5 mm to 5 mm at each couch motion direction. Calculated positions of all center positions of the BBs at three different images were agreed with the actual points within a millimeter and each other. Calculated center positions of the BBs from the reference and obtained EPIs after 2D-2D matching agreed within a millimeter. We could tentatively conclude that the OBI system was mechanically quite reliable for image guided radiation therapy (IGRT) purpose.

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The Design of Multiplexing Data Acquisition System for Multi Channel Bio-magnetic Signal (다채널 생채 자기 신호의 다중 데이터 획득 시스템 설계)

  • Chang, Won-Suk;Jeon, Chang-Ik;Huh, Young;Jin, Seung-Oh;Kim, Ki-Uk;Lee, Hyun-Ho
    • Proceedings of the KIEE Conference
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    • pp.515-518
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    • 2003
  • The electrical current generated by heart creates not only electric potential but also a magnetic field. In this paper, we have designed the multiplexing data acquisition system for multichannel bio-magnetic signal measurement. The system consists of VXI rack which is organized MUX and AD board, Industrial rack which is mounted single board computer and DSP board. This system enable to realtime monitoring of multichannel data simultaneously. The number of channel could be increased simply added each module and firmware could be upgraded easily using host port interface of DSP.

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