• Fire Science and Engineering
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• 제26권1호
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• pp.10-15
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• 2012

The fire event occurred in fire proof zone often causes serious electrical problems such as shorts, ground faults, or open circuits in nuclear power plants. These would be directed to the loss of safe shutdown capabilities performed by safety related systems and equipments. The fire event can treat the basic design principle that safety systems should keep their functions with redundancy and independency. In case of a cable fire, operators can not perform their mission properly and can misjudge the situation because of spurious operation, wrong indication or instrument. These would deteriorate the plant capabilities of safety shutdown and make disastrous conditions. In this paper, investigation and cause analysis of cable fire in Nuclear Power Plant, we described the cable fire temperature and functional failure criteria and the cable functional failure temperature evaluation by exposed fire is studied.

• Aerospace Engineering and Technology
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• 제8권2호
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• pp.61-67
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• 2009

This paper proposes an on-board orbit data generation algorithm for geostationary satellites. The concept of the proposed algorithm is as follows. From the ground, the position and velocity deviations with respect to the assumed reference orbit are computed for 48 hours of time duration in 30 minutes interval, and the generated data are up-loaded to the satellite to be stored. From the table, three nearest data sets are selected to compute position and velocity deviation for asked epoch time by applying $2^{nd}$ order polynomial interpolation. The computed position and velocity deviation data are added to reference orbit to recover absolute orbit information. Here, the reference orbit is selected to be ideal geostationary orbit with a zero inclination and zero eccentricity. Thanks to very low computational burden, this algorithm allows us to generate orbit data at 1Hz or even higher. In order to support 48 hours autonomy, maximum 3K byte memory is required as orbit data storage. It is estimated that this additional memory requirement is acceptable for geostationary satellite application.

• KIPE Magazine
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• 제18권6호
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• pp.37-44
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• 2013

• Water for future
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• 제44권7호
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• pp.37-43
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• 2011

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• 제3권10호
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• pp.83-90
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• 1982

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 한국통신학회 1996년도 추계종합학술발표회 논문집
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• pp.649-652
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• 1996

• KAPE Magazine
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• 통권241호
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• pp.7-9
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• 2016

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 한국안전학회 2003년도 추계 학술논문발표회 논문집
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• pp.86-91
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• 2003

원자력발전소의 설계는 다중방호의 개념에 의해 이루어져, 그 구조가 복잡하고 운전 형태도 다양하며, 이에 따라 사고의 전개 과정도 다양하게 나타난다. 이로 인해 원자력발전소의 운전원들은 발전소의 유동적인 상황에 대처할 수 있는 고도의 능력이 요구된다. 특히 주제어실 운전원들은 발전소의 기동 및 전출력 운전, 정지, 그리고 비정상 및 비상 상황 시의 적절한 대처에 대한 책임을 지고 있다. 발전소의 사고 분석 결과에 의하면, 사고에 대한 운전원의 대응이 사고의 전개에 직접적인 영향을 미치게 되며, 결과 적으로 사고에 대한 운전원들의 적절한 대응 능력은 발전소의 안전성에 중요한 부분임이 밝혀졌다.(중략)

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• 제7권6호
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• pp.73-79
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• 1986

과실을 수확한 후 판매하거나 저장고에 넣고나면 한해의 과수원 관리는 끝났다고 생각하여 겨울철의 과수원 관리를 게을리하는 경우가 있으나, 내년도의 과수원 관리를 보다 성공적으로 하기 위해서는 과수가 생육을 정지하고 겨울잠을 자는 겨울철의 과수원 관리가 매우 중요하다. 월동병해충의 구제등 겨울철의 과수원 관리를 보다 적극적으로 함으로써 생육기간중의 병해충의 발생밀도를 감소시킬 수 있을 뿐만 아니라 이상저온에 따른 동해의 피해를 경감시킬 수 있어 과실의 수량과 품질을 향상시킬 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• 제30권12C호
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• pp.1214-1221
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• 2005

In this paper, we propose a digital watermarking method for still images, in which the human visual system (HVS) is used in the discrete cosine transform (DCT) domain. The modulation transfer function (MTF) of the HVS model is employed to increase the invisibility of the inserted watermark in images. The proposed watermarking method is shown to be robust to several common image processing techniques, including lowpass filtering and cropping. Also, using the energy relationship of the DCT, we derive the equation that directly computes the watermark weighting factor in the DCT domain for the specified peak signal to noise ratio (PSNR) of the still image and the length of watermark to be inserted. The difference between desired PSNR and PSNR in spatial domain is within 0.07dB for the 7 test images.