Particle collection efficiency and air cleaning capacity were tested for the two-stage electrostatic precipitator for use in indoor air cleaning systems. A wire-plate type ionizer was used as a particle charger and a dielectric film consisted of polypropylene (or polyethylene) coated metals and zigzagged metal electrodes was used as a particle collector in the electrostatic precipitator. Both particle collection efficiency and air cleaning capacity increased as increasing the applied voltage on the charger and the collector, and furthermore, as increasing the collector film width (i.e. collection area). Air cleaning capacities estimated by the product of particle collection efficiency and air flow rate were quite well consistent with the experimental ones with a proportional constant of 0.964. Ozone concentrations emitted from the charger at the applied voltages of 5.0 and 5.2 kV were less than 0.05 ppm, indoor ozone standards of UL 867-2002, KS C 9314 and SPS-KACA002-132. For the air flow rate of 11.7 m³/min, the applied floor area of 48.2 m² could be obtained when 5.2 kV and 6.0 kV were applied on the ionizer and the collector, respectively and the collector of two 15 mm polyethylene dielectric films was used.

R&D연구소를 보유하고 있는 우리나라 민간기업 118개를 분석한 결과, R&D투자는 기술사업화성과, 매출액증가율 및 영업이익증가율 등 경영성과에 모두 긍정적인(+)영향을 미치는 것을 확인하였고, 기술사업화 능력이 R&D투자와 경영성과간의 관계에서 분석한 결과, 기술전략기획능력, 기술프로세스능력, 기술조직능력인 광의의 기술사업화 능력이 경영성과에 부분적으로 매개효과를 나타났으며, 제조능력과 마케팅능력인 협의의 기술사업화 능력은 경영성과에 모두 매개효과가 있는 것으로 나타났다. 따라서 R&D투자가 경영성과를 달성하는데 필요한 요인이지만, 기술사업화 능력도 경영성과에 매개작용을 하므로 기술사업화 능력을 강화하는 것이 필요함을 시사하고 있다.

The purpose of this work is to develop a new type of particle collection filter using electrical discharge technology. The new filter must be high efficiency and applicable to air conditioner to use for household, so we suggested the new type filter. The new type filter has a distinctive feature except characteristic of ESP, a thickness of collecting electrodes is thicker than that of existing type ESP. When particles come into the filter, the particles will collide with side surfaces of the collecting electrodes. At the same time of particle collision with side surface, the particles are charged by the collision and collected by electrical force. Therefore, we called this type "Ion Impactor". We optimized condition of thickness of collecting electrodes and applied voltage using six sigma method because thickness of collecting electrodes and applied voltage are very important to improve the collection efficiency. We analyzed distribution of electric field line, the electric field lines were uniformly distributed on the side surface of the collecting electrodes. From this analysis, we can see the improvement of the particle collection efficiency. We made the ion impactor type filter on a large scale to equip to the air conditioner, and measured the particle collection efficiency. For the 0.1∼0.2㎛ range particle, the collection efficiency was higher than that of existing type ESP by 30%. The collection efficiency of the 0.3∼0.4㎛ range particle was higher by 12%.