• Title, Summary, Keyword: instrumentation

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Characterization of structural properties of CNTs grown by ICP-CVD (ICP-CVD 방법을 이용한 탄소나노튜브의 제작 및 물성분석)

  • Chang, Seok-Mo;Kim, Young-Do;Park, Chang-Kyun;Uhm, Hyun-Seok;Park, Jin-Seok
    • Proceedings of the KIEE Conference
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    • pp.1533-1535
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    • 2002
  • Carbon nanotubes (CNTs) were grown with high density on a large area of Ni-coated silicon oxide substrates by using an inductively coupled plasma-chemical vapor deposition (ICP-CVD) of $C_2H_2$ at temperatures ranging from 600 to $700^{\circ}C$. The Ni catalyst was formed using an RF magnetron sputtering system with varying the operating pressure and exposure time of $NH_3$ plasma. The surface morphology of nickel catalyst films and CNTs was examined by SEM and AFM. The graphitized structure of CNTs was confirmed by Ramman spectra, SEM, and TEM. The growth of CNTs was observed to be strongly influenced by the surface morphology of Ni catalyst, which depended on the pre-treatment time and growth temperature. Dense CNTs with uniform-sized grains were successfully grown by ICP-CVD.

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Design of Multidivision for the Fittest of Color STN Decode (칼라 STN Decode의 최적화를 위한 다분할적 설계)

  • Ryu, Chi-Kook;Jung, Dong-Ho;Kwon, Sung-Yeol;Bae, Jong-Il;Lee, Dong-Cheol
    • Proceedings of the KIEE Conference
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    • pp.2617-2618
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    • 2002
  • The key point of this design can offer good picture resolution and a high-speed color STN decode. We maximize a combination processing of the color signal. Therefore, there is a color implementation at the natural. The age of the multimedia comes, so the color is considered important and wide. To be necessary a color implementation have become the importance which picture resolution is clean and low price of the liquid display TFT occupied greater part of the liquid display. But TFT could not consist low price realization. This research is a color implementation of STN at low price, design good picture resolution decode for optimum an limit of upside with frequency range maximizing and can reply in the high-speed by multidivision method. As a result, we design optimum of the STN decode.

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The Speed Control of an Induction Motor Based on Neural Networks (뉴럴 네트워크를 이용한 유도 전동기의 속도 제어)

  • Lee, Dong-Bin;Ryu, Chang-Wan;Hong, Dae-Seung;Ko, Jae-Ho;Yim, Wha-Yeong
    • Proceedings of the KIEE Conference
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    • pp.516-518
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    • 1999
  • This paper presents an feed-forward neural network design instead PI controller for the speed control of an Induction Motor. The design employs the training strategy with Neural Network Controller(NNC) and Neural Network Emulator(NNE). Emulator identifies the motor by simulating the input and output map. In order to update the weights of the Controller. Emulator supplies the error path to the output stage of the controller using backpropagation algorithm. and then Controller produces an adequate output to the system due to neural networks learning capability. Therefore it becomes adjustable to the system with changing characteristics caused by a load. The speed control based on neural networks for induction motor is implemented by a vector controlled induction motor. The simulation results demonstrate that actual motor speed with neural network system well follows the reference speed minimizing the error and is available to implement on the vector control theory.

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A Study on Development of Virtual MCR Collaboration Training System (가상 MCR 협동 훈련 시스템(Virtual MCR Collaboration training System)에 관한 연구)

  • Yoo Hyeon Ju;Lee Yong-Gwan;Lee Myeong-Su;Hong Jin-Hyeok;Choe Jin-Ho
    • Proceedings of the KIPE Conference
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    • pp.124-127
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    • 2001
  • 가상현실 기술을 이용한 컴퓨터 지원 교육훈련 시스템 (VR-CATS: Virtual Reality based Computer Assisted Training System) 개발에 대한 연구를 전력연구원에서는 계속 수행해 왔다. 본 논문에서는 New VR-CATS (울진 3호기 참조)중 가상현실에서의 공동 협동 훈련 시스템(Virtual Reality Collaboration Training System)의 설계에 관하여 서술한다. 공동작업은 발전소 MCR(Main Control Room)을 3D 데이터 모델링 후 가상현실화하고 MCR 내부를 Navigation 할 수 있도록 가상패널(Virtual Panel)을 개발 및 에에 대한 엔지니어링 데이터베이스환경을 작성하여 추후 정확하고 신속한 계기 정보를 얻을 수 있도록 하며 훈련생들이 시뮬레이터실로 가지 않고 MCR에서 발전소를 운전하는 것과 같은 효과를 강의실에서 얻을 수 있다. 또한 설계기준사고 중의 하나인 LOCA 사고 복구 훈련 시나리오를 통하여 실제와 동일한 복구 훈련을 하므로서 효율적이며 현장감있는 교육훈련 수행을 가능케 한다.

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A Study of Controller's Output Characteristics for Hatic Interface System (촉각시스템용 제어기의 출력특성연구)

  • Kim Y.S.;Kim A.H.;Bae C.;Kang W,C.;Kim Y.D.
    • Proceedings of the KIPE Conference
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    • pp.410-414
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    • 2003
  • In this paper, the virtual-reality system is tried to developed, which controls not only the sense of sight and hearing but also the sense of touch, In order to develope the sense of touch in this study, the stable tactual transaction-system, based on summing up the basic algorithm and theory, is embodied. The hardware of this system consists of the 6DOF haptic interface, a controller and a driver In the case of the software, the proxy algorithm is applied for the force-transaction and the mopping algorithm is used for graphic transaction. In addition to this, the imaginary-device driver is utilized for controlling the system and manager-class is also included in this system to manage the position-change and the like. Consequently, the proxy algorithm Is applied, which makes the system possible to be more stable and prompt with and imaginary object. Moreover, the impulse-algorithm is applied to work out a problem which the tactual transaction-period is different from the graphic transaction-period.

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Case Study of Immersed Tunnel Instrumentation Management Using Wireless System (지중무선 시스템을 이용한 침매터널 구간 계측관리 사례연구)

  • Han, Sang-Wook;Kim, Byung-Hee;Han, Byung-Won;Lee, Gye-Chun
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.768-773
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    • 2009
  • Measuring method being applied for off-shore works is performed by using data logger or manual measuring instrument with wiring the cable connected from the sensor up to the position where measuring is allowed.(upper part of embankment or marine structure) Measuring management by using existing measuring method may be acceptable on the condition that the ground deformation volume(vertical, horizontal) is generally minimal and the site condition is good. But loss of measuring instrument, sensor cable failure or cutting is taken place frequently due to significant change of ground behavior caused by an external force change(embankment, excavation) under very soft ground condition(N value below 0-4). In case of the marine works, in particular, loss rate of measuring instrument is highly represented due to the factors of working barge anchoring, constructional interference and natural disaster. In order to solve these problems, measuring management was performed with employing underground wireless system at the immersed tunnel site. Measuring data was obtained freely under the marine environment by using underground wireless communication and cable cutting potential by ground behavior could be reduced. Measuring cost savings and its installation convenience were maximized by way of off-shore tower installation or cabling and by minimizing constructional interference of off-shore working barge. This case of measuring management was accomplished successfully.

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A Study of the Silicon Mold Surface Treatment Using CHF3 Plasma for Nano Imprint Lithography (나노임프린트 리소그래피 적용을 위한 CHF3 플라즈마를 이용한 실리콘 몰드 표면 처리 특성)

  • Kim, Young-Keun;Kim, Jae-Hyun;You, Ban-Seok;Jang, Ji-Su;Kwon, Kwang-Ho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.24 no.10
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    • pp.790-793
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    • 2011
  • In this study, the surface modification for a silicon(Si) mold using $CHF_3$ inductively coupled plasma(ICP). The conditions under that plasma was treated a input ICP power 600 W, an operating gas pressure of 10 mTorr and plasma exposure time of 30 sec. The Si mold surface became hydrophobic after plasma treatment in order to $CF_x$(X= 1,2,3) polymer. However, as the de-molding process repeated, it was investigated that the contact angle of Si surface was decreased. So, we attempted to investigate the degradation mechanism of the accurate pattern transfer with increasing the count of the de-molding process using scanning electron microscope (SEM), contact angle, and x-ray photoelectron spectroscopy (XPS) analysis of Si mold surface.

Fabrication of a FBAR device using a novel process and the effect of bottom electrode on the frequency response (신 공정을 이용한 멤브레인형 체적탄성파 공진기의 제작 및 하부전극이 주파수 응답특성에 미치는 영향)

  • Kim, Bo-Hyun;Kim, Do-Young;Cho, Dong-Hyun;Lee, Jin-Bock;Park, Jin-Seok
    • Proceedings of the KIEE Conference
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    • pp.1594-1596
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    • 2004
  • Film bulk acoustic resonator (FBAR) devices which adopt a membrane-type configuration are fabricated by a novel process. In contrast to the conventional FBAR structure, the newly fabricated resonator doesn't employ any supporting layer below or above it, so that the properties of piezoelectric layer are not influenced by the bottom electrode material. FBAR devices with Mo/AlN/Metal configuration are also fabricated. The frequency response characteristics ($S_{11}$) of the devices fabricated using the proposed process are compared with those of the conventional devices. The return losses are also estimated, in terms of the kind and thickness of bottom electrode materials.

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Structural properties and field-emission characteristics of CNTs grown on Ni and Invar catalysts employing an ICP-CVD method (ICP-CVD 방법을 이용하여 Ni 및 Invar 촉매 위에 성장시킨 탄소나노튜브의 구조적 물성 및 전계방출 특성)

  • Hong, Seong-Tae;Kim, Jong-Pil;Park, Chang-Kyun;Uhm, Hyun-Seok;Park, Jin-Seok
    • Proceedings of the KIEE Conference
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    • pp.1597-1599
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    • 2004
  • Carbon nanotubes (CNTs) are grown on the TiN-coated silicon substrate by varying the thickness of Ni and Invar426 catalyst layers at 600$^{\circ}C$ using an inductively coupled plasma-chemical vapor deposition (ICP-CVD). The Ni and Invar426 catalysts are formed using an RF magnetron sputtering system with various deposition periods. Characterization using various techniques, such as FESEM, HRTEM, and Raman spectroscopy, shows that the physical dimension as well as the crystal quality of grown CNTs are strongly changed by the kind and thickness of catalyst materials. It is also seen that Ni catalysts would be more desirable for vertical-alignment of CNTs compared with Invar426 catalysts. However, the CNTs using Invar426 catalysts display much better electron emission capabilities than those using Ni catalysts. The physical reason for all the measured data obtained are discussed to establish the relationship between structural properties and field-emissive properties of CNTs.

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Introduction of Requirements and Regulatory Guide on Cyber Security of I&C Systems in Nuclear Facilities (원전 계측제어시스템의 사이버보안 요구사항)

  • Kang, Young-Doo;Jeong, Choong-Heui;Chong, Kil-To
    • Proceedings of the KIEE Conference
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    • pp.209-210
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    • 2008
  • In the case of unauthorized individuals, systems and entities or process threatening the instrumentation and control systems of nuclear facilities using the intrinsic vulnerabilities of digital based technologies, those systems may lose their own required functions. The loss of required functions of the critical systems of nuclear facilities may seriously affect the safety of nuclear facilities. Consequently, digital instrumentation and control systems, which perform functions important to safety, should be designed and operated to respond to cyber threats capitalizing on the vulnerabilities of digital based technologies. To make it possible, the developers and licensees of nuclear facilities should perform appropriate cyber security program throughout the whole life cycle of digital instrumentation and control systems. Under the goal of securing the safety of nuclear facilities, this paper presents the KINS' regulatory position on cyber security program to remove the cyber threats that exploit the vulnerabilities of digital instrumentation and control systems and to mitigate the effect of such threats. Presented regulatory position includes establishing the cyber security policy and plan, analyzing and classifying the cyber threats and cyber security assessment of digital instrumentation and control systems.

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