• The Science & Technology
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• v.17 no.10 s.185
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• pp.45-47
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• 1984

도전성 플라스틱 / 감광성수지 / 자기버블기억(Magnetic Bubble Memory) / 방사오염제거 기술 상용화

• Transactions of the Korean Society of Mechanical Engineers B
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• v.23 no.6
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• pp.713-721
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• 1999

A composite plastic, where long metallic fibers are used as filling materials, is transformed from nonconducting to conducting medium as the volume fraction of filling metallic fibers is increased from zero : such drastic change in property is called the percolation. It is desired both for practical and theoretical purposes to understand the physics underlying the percolation and to estimate the percolation threshold that is defined by the minimum volume fraction of the metallic fibers for which the percolation occurs. In this study, percolation thresholds are calculated by Monte Carlo Computer simulation. Both lattice and continuum spaces are considered and detailed microstructures of metallic fibers are modelled as rigid and flexible bodies for both model spaces. Simulations are carried out for wide range of aspect ratios and discussions are given.

• The monthly packaging world
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• s.345
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• pp.84-87
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• 2022

지난해 11월 26일 롯데호텔서울에서 열린 제10회 플라스틱산업의 날 기념행사에서 최봉규 (주)천일 대표이사가 '자랑스러운 플라스틱산업인상'을 수상했다. 1991년 3월 광주광역시 하남공단에 플라스틱 포장재 전문 기업 천일산업으로 포장업을 시작한 최봉규 대표이사는 2010년 평동산단에 (주)천일을 설립, 다양한 기능성 포장재와 친환경 포장재를 선보이며 국내 포장업계를 선도하고 있다. 최 대표이사를 만나 친환경 포장과 기능성 포장에 대한 도전을 계속해서 하고 있는 이유, 그리고 그 성과와 향후 목표에 대한 이야기를 들어보았다.

• The Journal of the Korea Contents Association
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• v.11 no.9
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• pp.129-136
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• 2011

In this paper, the shielding material for the product design of various electrical appliances is suggested by more environmentally materials like as the lacquer and the charcoal. The suggested shielding material has the shielding effectiveness of 97.2%, 98.7%, and 96.3% at 900 MHz, 1.8 GHz, and 2.45 GHz, respectively. In the microwave oven and the cell phone, the metal or metal-coated plastic are used for the shielding of strong electromagnetic wave. However, by using more environmentally materials like as the lacquer and the charcoal, the products can be manufactured more light weighting, more heat-resisting, more abrasion resisting, and more corrosion resisting. Also, the products design can be varied more mellow and more friendly.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.25 no.11
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• pp.595-599
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• 2013

The pipes used in buildings are generally categorized into metallic or plastic materials. Metal pipes, such as copper and stainless steel pipes, are mainly used for water and hot water supply, and for the heating system. However, plastic pipes made of polyethylene and cross-linked polyethylene are used for floor heating, water drainage, and air vent systems. Usually, plastic pipes have thermal demerits, such as high linear expansion coefficients and bending phenomenon by hot water, although the pipes have several merits of light weight, low price, low thermal conductivity, and the comparatively high workability of metal pipes. Therefore, if those kind of demerits are overcome, plastic pipes can be easily accepted for hot water systems. This research is aimed to evaluate the applicability for vertical heating pipes of a plastic pipe system consisting of electric fusion fitting of a conductive carbon compound and propylene random glass fiber pipe, through measurement of the expansion rate and leakage in summer and winter seasons, in the apartment construction field.