Search | Korea Science

Lhee, Sang Choon;Choi, Yeo Jin;Choi, Young Joon
- KIEAE Journal
- /
- v.13 no.4
- /
- pp.63-68
- /
- 2013
On the electricity consumption in Korea, the lighting sector takes about 17% of annual total electricity consumptions. In the midst of higher interests on energy conservation measures, design and choice of energy-saving lighting fixtures have been more important. With growth of technology-intensive industries like advanced material, semiconductor, and biotechnology from the 1980s, needs for clean room and thus illumination at clean rooms have been increased. In this paper, development, specification, and features of a Teardrop LED(hereinafter TD LED) lighting fixture as replacement of Teardrop florescent lighting one that has been popularly installed at clean rooms were presented. Also we performed the economic analysis of return on investment(ROI) about energy savings by the installation of the TD LED lighting fixture at a new-built clean room. The economic analysis showed that the new-developed TD LED lighting fixture would be able to withdraw the initial installation cost within 4 years. Lastly, improvement directions and development plans of the next TD LED lighting fixture for wider applications at clean rooms were described.
https://doi.org/10.12813/kieae.2013.13.4.063 인용 PDF KSCI

Song, Gen-Soo;Yoo, Kyung-Hoon;Kim, Hyoung-Tae
- Proceedings of the SAREK Conference
- /
- 2009.06a
- /
- pp.1306-1311
- /
- 2009
In recent semiconductor manufacturing clean rooms, in order to improve clean room air quality, air washers are used to remove airborne gaseous contaminants such as $NH_3$, SOx and organic gases from the outdoor air introduced into clean room. Meanwhile, there is a large amount of exhaust air from a clean room. From an energy conservation point of view, heat recovery is therefore useful for reducing the outdoor air conditioning load for a clean room. Therefore it is desirable to recover heat from the exhaust air and use it to reheat the outdoor air. In the present study, numerical analysis and experiment was conducted to simulate the amount of energy reduction of exhaust air heat recovery type air washer system. The present numerical results showed good agreement with the results of the experimental data.
PDF

Li, Bingjun
- Bulletin of the Korean Mathematical Society
- /
- v.46 no.1
- /
- pp.71-78
- /
- 2009
An element of a ring R with identity is called strongly clean if it is the sum of an idempotent and a unit that commute, and R is called strongly clean if every element of R is strongly clean. Let R be a noncommutative local ring, a criterion in terms of solvability of a simple quadratic equation in R is obtained for $M_2$(R) to be strongly clean.
https://doi.org/10.4134/BKMS.2009.46.1.071 인용 PDF KSCI