• Title, Summary, Keyword: instrumentation

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Superconducting Tunnel Junction Detectors for Mass Spectrometry

  • Ohkubo, M.;Zen, N.;Kitazume, T.;Ukibe, M.;Shiki, S.;Koike, M.
    • Progress in Superconductivity
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    • v.14 no.2
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    • pp.77-81
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    • 2012
  • With conventional mass spectrometry (MS), ions are separated according to mass/charge (m/z) ratios. We must speculate the z values to obtain the m values. Superconducting tunnel junction (STJ) detectors can solve this problem, and true mass spectrometry becomes possible instead of m/z spectrometry. The STJ detectors were installed in MS instruments with a variety of ion sources. As an example, we report fragmentation analysis of a non-covalent protein complex of hemoglobin.

Crosstalk evaluation in multiview autostereoscopic three-dimensional displays with an optimized diaphragm applied

  • Peng, Yi-Fan;Li, Hai-Feng;Zheng, Zhen-Rong;Xia, Xin-Xing;Yao, Zhi;Liu, Xu
    • Journal of Information Display
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    • v.13 no.2
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    • pp.83-89
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    • 2012
  • The crosstalk evaluation of multiview autostereoscopic three-dimensional (3D) displays is discussed, with both the human and technical factors investigated via image quality assessment. In the imaging performance measurements and analysis for a multiview autostereoscopic display prototype equipment, it was inferred that crosstalk would have both a positive and a negative effect on the imaging performance of the equipment. The importance of the attached diaphragm in the crosstalk evaluation was proposed and then experimentally verified, using the developed prototype equipment. The luminance distribution and crosstalk situation were given, with two different diaphragm arrays applied. The analysis results showed that the imaging performance of this 3D display system can be improved with minimum changes to the system structure.

Long Term Clinical and Radiological Follow-up Study in Spondylolisthesis, Grade I : Decompression with or without Instrument (GradeⅠ요추부 척추 전방 전위증의 치료 : 감압성 후궁절제술과 고정기구 삽입술의 비교)

  • Chung, Seung Young;Kim, Gook Ki;Lim, Young Jin;Kim, Tae Sung;Leem, Won;Rhee, Bong Arm
    • Journal of Korean Neurosurgical Society
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    • v.30 no.sup2
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    • pp.235-241
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    • 2001
  • Objective : Controversy exists which surgical treatment better in lumbar grade I spondylolisthesis, decompressive laminectomy with or without lumbar instrumentation. Methods : Out of Sixty-four patients with lumbar spondylolisthesis underwent surgery, 18 patients operated with decompressive laminectomy alone and 44 patients with decompession and lumbar instrument, during recent 5-years between January, 1994 and December, 1998. The author studied a long term follow-up in the above two groups to analyzing the overall clinical outcomes in each group and to determining the incidence of pos-toperative radiologic instability. Results : 1) Overall postoperative symptoms improvement were not so different in both groups. 2) Postoperative progressive subluxation is more common after decompressive laminectomy without instrumentation than with instrumentation group. 3) Overall clinical outcomes were slightly better in decompressive laminectomy without instrumentation than with instrumentation group but there was no significant difference. 4) Postoperative radiologic changes did not seem to influence the patient-reported clinical outcomes. 5) Postoperative complications is more common in decompressive laminectomy with instrumentation group than without instrumentation group. Conclusion : In the surgical management of grade I spondylolisthesis, the efficiency and superiority of surgical treatments requires the cost effectiveness and risk/benefit analysis of decompressive laminectomy with or without instrumentation. Therefore, Further detailed studies of long term follow up in a large number of patients in each group are needed for choice of best treatment.

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A CYBER SECURITY RISK ASSESSMENT FOR THE DESIGN OF I&C SYSTEMS IN NUCLEAR POWER PLANTS

  • Song, Jae-Gu;Lee, Jung-Woon;Lee, Cheol-Kwon;Kwon, Kee-Choon;Lee, Dong-Young
    • Nuclear Engineering and Technology
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    • v.44 no.8
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    • pp.919-928
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    • 2012
  • The applications of computers and communication system and network technologies in nuclear power plants have expanded recently. This application of digital technologies to the instrumentation and control systems of nuclear power plants brings with it the cyber security concerns similar to other critical infrastructures. Cyber security risk assessments for digital instrumentation and control systems have become more crucial in the development of new systems and in the operation of existing systems. Although the instrumentation and control systems of nuclear power plants are similar to industrial control systems, the former have specifications that differ from the latter in terms of architecture and function, in order to satisfy nuclear safety requirements, which need different methods for the application of cyber security risk assessment. In this paper, the characteristics of nuclear power plant instrumentation and control systems are described, and the considerations needed when conducting cyber security risk assessments in accordance with the lifecycle process of instrumentation and control systems are discussed. For cyber security risk assessments of instrumentation and control systems, the activities and considerations necessary for assessments during the system design phase or component design and equipment supply phase are presented in the following 6 steps: 1) System Identification and Cyber Security Modeling, 2) Asset and Impact Analysis, 3) Threat Analysis, 4) Vulnerability Analysis, 5) Security Control Design, and 6) Penetration test. The results from an application of the method to a digital reactor protection system are described.

Implementation & Application of Instrumentation System on Performance Evaluation for Korea-Radio Train Control System (통신기반 열차제어시스템 성능평가용 계측시스템 구현 및 적용)

  • Lee, Jae-Ho;Lee, Kang-Mi;Park, Pyoung-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1777-1783
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    • 2013
  • This study aims to implement an instrumentation system measuring and analysing real-time data of information flow between respective subunits composing train control system as the performance evaluation method for wireless communication based urban railway train control system under development for a Korean model. It analyses system functional requirements regarding subsystems composing wireless communication based train control system and test items for functions presented in each specification and examines data and measurement point for measuring according to test items in order to implement an instrumentation system. And, it clearly defines requirements of an instrumentation system to avoid malfunction or error in operation of train control system. It reviews data processing method and display method for effective analysis of data flow between respective subunits with measured data, designs and makes an instrumentation system. Ultimately, it applies to a performance test of train control system and makes sure an instrumentation system in normal working order.

해양플렌트를 위한 4륜구동 청소 로봇 시스템 개발

  • Kim, Min;Choi, Myoung-Hoon;Jeong, Jae-Hoon;Kim, Hyun-Jo;Kang, Min-Woo;Park, Won-Hyeon;Kim, Gwan-Hyung;Byun, Gi-Sik
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.919-920
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    • 2014
  • 따개비(barnacle)는 선저부에 붙어서 번식하며 딱딱한 석회질 껍데기로 덮여있다. 이로 인하여 선박의 속도를 저하시키고 도료기능을 상실시키는 주요인이 된다. 이를 제거하기 위해 작업자가 직접 액체를 분사하고 브러쉬로 세척해야 한다는 불편함과 위험에 노출되기 때문에 선박작업용 로봇이나 기계들이 많이 개발되고 있다. 현재 연구 중이거나 개발이 완료된 것 중에는 영구자석 또는 전자석 휠을 사용하거나 공압을 이용하여 수직벽면에서 작업을 한다. 특히 공압 방식을 많이 사용하였는데 수직벽면에 로봇이 밀착될 만큼 강한 공압이 필요하게 되기 때문에 부가적인 장치가 많이 필요하다. 본 논문에서는 부가적인 장치를 최소화하고 효과적인 동작을 하기위해 전자석 방식을 선택 하였으며 간편하게 선박의 수직벽면을 작업할 수 있는 전자석 방식의 4륜 로봇을 개발하고자 한다. 선박의 수직벽면 작업용 4륜구동 로봇을 전자석을 이용하여 수직벽면에 부착할 수 있도록 설계하였으며 자력의 세기와 방향을 제어하여 로봇이 선박의 수직면에 밀착되어 자유롭게 이동이 가능하도록 개발 하고자 한다.

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Thermo-structural monitoring of RCC dam in India through instrumentation

  • Ashtankar, V.B.;Chore, H.S.
    • Structural Monitoring and Maintenance
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    • v.2 no.2
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    • pp.95-113
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    • 2015
  • The knowledge of the behavior of any roller compacted concrete (RCC) dam and its foundation is gained by studying the service action of the dam and its foundation using measurements of an external and internal nature. The information by which a continuing assurance of structural safety of the RCC dam can be gauged is of primary importance. Similarly, the fact that the information on structural and thermal behavior and the properties of concrete that may be used to give added criteria for use in the design of future RCC dams is of secondary importance. Wide spread attention is now being given to the installation of more expensive instrumentation for studying the behavior of concrete dams and reservoirs and forecasting of any adverse trends. In view of this, the paper traces installation and need of the comprehensive instrumentation scheme implemented to monitor the structural and thermal behavior of 102.4 m high RCC dam constructed near Mumbai in India. An attempt is made in the present paper to emphasize the need to undertake an instrumentation program and evaluate their performance during construction and post construction stage of RCC structures. Few typical results, regarding the thermal and structural behavior of the dam, obtained through instrumentation installed at the dam site are presented and compared with the design considerations. The fair agreement is seen in the response observed through instrumentation with that governing the design criteria.

Instrumentation technology for flight test (비행시험 계측기술에 관한 연구)

  • 황명신
    • 제어로봇시스템학회:학술대회논문집
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    • pp.460-465
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    • 1993
  • The instrumentation system is the most important aspect of a flight test program. It is the means by which the objective of a flight test, the production of accurate, useful data, is achieved. An instrumentation system consists of everything required to sense, condition, and record all parameters of interest The task of a flight test engineer is to select a system that is adequate to obtain all needed data, but not complex, expensive, and heavy than the situation demands. In this paper, the primary factors that determine the design of an instrumentation system are discussed.

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Decoupled Control of Induction Motors for Both High Power Efficiency and High Dynamic Performancea

  • Kim, Dong-Il;Ko, Myoung-Sam;Ha, In-Joong;Park, Jae-Wha
    • 제어로봇시스템학회:학술대회논문집
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    • pp.852-857
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    • 1988
  • In induction motor control, power efficiency as well as high dynamic performance is important. We attempt to achieve both of them by decoupled control of rotor speed and flux. A nonlinear feedback controller with a well-known rotor flux observer is proposed with its stability analysis. Experimental results demonstrate that the proposed control method based on recently developed nonlinear feedback control theory is of practical use.

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