• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.2
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• pp.200-207
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• 2000

Recently, it is increased to apply the inverter system to household electrical appliances, especially in the air c conditioners, refrigerators and washing machines, to reduce the power consumption and the acoustic noise by t the low speed operation, and to make their functions more comfortable for human beings. For the inverter s systems, however, it is highly required to reduce the undesirable electromagnetic noise and psychoacoustic n noise generated by PWM for variable speed operation. In this paper, the electromagnetic noise for the d detenninistic PWM and random PWM for the reciprocating compressors driven by the brusWess dc motor was a analyzed. It was also verified through the experiment that the elt'Ct$\tau$omagnetic noise was reduced and the s sound quality was improved by applying the random PWM.

• Journal of KSNVE
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• v.7 no.4
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• pp.663-668
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• 1997

In general, the noise of alternator is generated by structure of attachment and structural characteristics of alternator itself. In this paper, general phenomena and causes of alternator noise have been considered. Especially, electromagnetic noise source of alternator has been discussed by consideration about the vibration of stator teeth. Also experimental method and simulation method have been used for the proof.

• Digital Contents
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• no.7 s.86
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• pp.36-37
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• 2000

그동안 주목을 받았던 국내 최초의 인터넷 관련 지적 재산권 분쟁에 대해 검찰이 해당사들에 대해 벌금 1백만원의 약식 기소를 함으로써 분쟁에 대한 마무리가 지어지고 있다. 그러나 분쟁 당사자인 후이즈 측은 이에 불복, 항소의 뜻을 비쳐 귀추가 지목되고 있다. 분쟁 당사자는 도메인 등록업체인 후이즈와 인터넷 프라자, 이 소송은 지난해 12월 후이즈가 인터넷 프라자 등 4개사를 상대로 자사의 콘텐츠를 도용한 혐의로 54억 8천만원의 손해배상 소송을 제기한 것으로 시작된다.

• Social Workers
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• no.2 s.34
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• pp.42-43
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• 2005

• Tunnel and Underground Space
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• v.27 no.4
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• pp.195-204
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• 2017

This case study introduces the construction of large cross section tunnel for underground ventilation system in Sillim-Bongcheon Tunnel Project. In order to grant the safety and efficiency in connecting the ventilation shaft (7.8 m of width, and 6.6 m of height) to a tunnel for axial fan facility (20.8 m of width, and 12.3 m of height), gradual enlargement of tunnel cross section was employed between those and temporary support method was determined based on Q system. In addition, some original designs were revised during construction stage to improve the efficiency of excavation in large cross section tunnel. The advance length was optimized and top heading of the tunnel was excavated without partition in accordance with ground condition and numerical stability analysis results. It is believed that some experiences and considerations in this case study will be useful for the future design and construction in similar large cross section tunnel such as large underground ventilation system or road tunnel with four lanes.

• Nuclear industry
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• v.7 no.8 s.54
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• pp.100-101
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• 1987

• NEWSLETTER 전기공업
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• no.93-25 s.97
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• pp.17-39
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• 1993

• Journal of Korea Fair Competition Federation
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• no.137
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• pp.25-40
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• 2008

• Journal of Environmental Health Sciences
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• v.6 no.1
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• pp.37-41
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• 1979

• 월간산업보건
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• s.371
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• pp.58-59
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• 2019