• Title/Summary/Keyword: Man-Power

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Optimal Design of Hydraulic System Using the Complex Method (컴플렉스법에 의한 유압시스템의 최적 설계)

  • Lee S.R.;Lee Y.B.;Park J.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.1 no.4
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    • pp.1-8
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    • 2004

  • The optimum design parameters of several hydraulic systems are obtained using the complex method that is one kind of constrained direct search method. First, the parameters of lead-lag controller of the direct drive servovalve is designed using the complex method to satisfy the steady-state error requirement. Second, the optimum locating point of hydraulic cylinder Is determined to minimize the cylinder force in the operation range of rotational sluice gate. For the third application case, the optimum piston area of hydraulic cylinder is determined to minimize the man power to elevate the manually operated sluice gate.

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The Characteristics of Power MOSFET (전력용 MOSFET의 특성)

  • Bae, Jin-Yong;Kim, Yong;Kwon, Soon-Do;Cho, Kyu-Man;Eom, Tae-Min
    • Proceedings of the KIEE Conference
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    • 2009.04b
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    • pp.131-135
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    • 2009

  • This paper reviews the characteristics of Power MOSFET device technology that are leading to improvements in power loss for power electronic system. The silicon bipolar power transistor has been displaced by silicon power MOSFET's in low and high voltage system. The power electronic technology requires the marriage of power device technology with MOS-gated device and bipolar analog circuits.

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ADVANCED MMIS TOWARD SUBSTANTIAL REDUCTION IN HUMAN ERRORS IN NPPS

  • Seong, Poong Hyun;Kang, Hyun Gook;Na, Man Gyun;Kim, Jong Hyun;Heo, Gyunyoung;Jung, Yoensub
    • Nuclear Engineering and Technology
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    • v.45 no.2
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    • pp.125-140
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    • 2013

  • This paper aims to give an overview of the methods to inherently prevent human errors and to effectively mitigate the consequences of such errors by securing defense-in-depth during plant management through the advanced man-machine interface system (MMIS). It is needless to stress the significance of human error reduction during an accident in nuclear power plants (NPPs). Unexpected shutdowns caused by human errors not only threaten nuclear safety but also make public acceptance of nuclear power extremely lower. We have to recognize there must be the possibility of human errors occurring since humans are not essentially perfect particularly under stressful conditions. However, we have the opportunity to improve such a situation through advanced information and communication technologies on the basis of lessons learned from our experiences. As important lessons, authors explained key issues associated with automation, man-machine interface, operator support systems, and procedures. Upon this investigation, we outlined the concept and technical factors to develop advanced automation, operation and maintenance support systems, and computer-based procedures using wired/wireless technology. It should be noted that the ultimate responsibility of nuclear safety obviously belongs to humans not to machines. Therefore, safety culture including education and training, which is a kind of organizational factor, should be emphasized as well. In regard to safety culture for human error reduction, several issues that we are facing these days were described. We expect the ideas of the advanced MMIS proposed in this paper to lead in the future direction of related researches and finally supplement the safety of NPPs.

  • https://doi.org/10.5516/NET.04.2013.700 인용 PDF KSCI KPUBS

SINR Measurement Method for IEEE 802.16m WilessMAN-Advanced User Equipment (IEEE 802.16m WirelessMAN-Advanced 단말의 SINR 측정 방법)

  • Kim, Jun-Woo;Bang, Young-Jo;Park, Youn-Ok;Kim, Whan Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38B no.2
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    • pp.154-161
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    • 2013

  • This paper presents the signal-to-interference plus noise ratio (SINR) estimation of IEEE 802.16m WirelessMAN-Advanced mobile station with simulation and implementation results. The downlink signal of IEEE 802.16m has two kinds of A-Preambles: the PA-preamble and the SA-preamble. This paper proposes the efficient method of estimating SINR with A-Preambles, by measuring noise power from PA-preamble and measuring interference power and signal power from SA-preamble. The proposed SINR measurement block contains important features such as subcarrier phase rotation elimination and simplified dB transform. The result of this paper is integrated to ETRI's IEEE 802.16m test mobile station, used for decision of adaptive-modulation-and-coding (AMC) and hand-over. It showed good measurement performance in simulation and unified system link test also.

  • https://doi.org/10.7840/kics.2013.38B.2.154 인용 PDF KSCI