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위상봉 한국기술교육대학교 1997 論文集 Vol.4 No.1
The design and evaluation on Lightning protection of aircraft are great issues in modern aircraft industry. The potential risks are considered under four headings named, structural, fuel, electrical system and other hazards. The size and shape of lightning current can vary widely, for protection purpose, we need only consider the more severe condition like Military-Standard-1757 (Lightning Qualification Test Techniques for Aerospace vehicles and Hardware). In this paper, we have formed the lightning impulse voltage and current wave form based on the MIL-STD 1757, and tested the front-cowling and stabilizer composed with composite materials on Turboprop Trainer aircraft. Test results showed that composite materials protected by aluminum coating or copper mesh have damaged on the surface at which lightning contacts, but doesn't look like to be a fatal damage that induced the structural deformation or explosion of aircraft. On the contrary, unprotected pure composite material has critical damage like puncture through composite matrix.
위상봉 한국기술교육대학교 1998 論文集 Vol.5 No.1
Majority parts of the faults in domestic power system and communication network and electronic equipments are directly or indirectly related with the lightning phenomena, the study for the reduction of lightning damage might be important issues in view of reliability and safety. Statistics of lightning flash parameter is a basic data to develop the lightning protection technology. In this paper we studied the 3 years lightning flash parameter in korea by operation of KLDN(Korean Lightning Detection network) system. We also proceeded the site error correction to improve the accuracy and the efficiency of the system. This new lightning studies showed that the data are more useful, more accurate, more diverse than the IKL data of the past in Korea.
위상봉 한국기술교육대학교 2003 論文集 Vol.10 No.1
With growing interest in the improvement of the ozone production in the industrial fields, many types of ozonizer using the electrical discharges have been proposed for the higher efficiency and the higher performance at atmospheric pressure. Among them, a superposition of different type discharges has been proposed. Especially, since the improvement for the low efficiency of dc discharge and narrow gap of surface discharge is required, a dc and an ac voltage are applied to same reaction space (or volume) to increase energy density at the same space. An investigation was focused on the superposition with a dc (streamer) corona and a surface discharge. This paper describes the investigation results on fundamental ozone generation characteristics by this superimposed discharge.