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전계와 자계가 식물씨앗의 발아와 초기생장에 미치는 영향
문재덕,권남열 대한전기학회 2006 전기학회논문지C Vol.55 No.6(C)
- All the plants on earth live under an electric and magnetic field because the earth is a magnet and there is an electric field between the charged cloud and the ground. It has been reported that electromagnetic fields influence both the activation of ions and polarization of dipoles in living cells of seeds and plants, though the mechanism of these actions is still poorly understood. In this paper, the effects of the electric and magnetic fields and exposure times to the germination of several vegetable seeds and its early growth have been investigated experimentally to find out the feasibility of a plant factory for mass production of clean and unpolluted vegetables. The germination rate and the growth rate of some seeds under the fields exposed were analysed and compared with those of unexposed ones. It is found that the germination rate and its early growth rate of exposed seeds under the fields were accelerated about 1.1-1.4 and 1.7-2.2 times in maximum compared with those of unexposed ones. But, however, an inhibitory effect on germination and plant early growth were shown in the case of the higher electric and magnetic fields.
문재덕,김태훈,황덕현 대한전기학회 2005 전기학회논문지C Vol.54 No.9(C)
Ion migration characteristics of a rotary spark airgap of high voltage pulse generator had been investigated. It was considered that the ion migration speed and the ions of the gases(atmosphere gases, O2, N2,, and H2O, etc.) and the charged very fine particles(about 10∼100nm size) migrated through the upper stator ball and bottom stator ball of the rotary spark airgap would determined the rise and fall times of the output high voltage pulse. In this paper, a basic study on the ion migration characteristics of the rotary spark airgap between the spark stator ball and the ion-sensing electrode of the proposed high voltage pulse generator have been investigated experimentally. As a result, the three kinds of ion speeds were detected by the ion-sensing electrode installed at the position of the bottom stator ball of the ball type sparkgap of the high voltage pulse generator. The migration velocities, diameters, masses, charges, numbers of the ions and particles were obtained by experiments and calculations, which, however, would determine the rise and fall times of the output high voltage pulse.
문재덕,안창진 대한전기학회 2005 전기학회논문지C Vol.54 No.10-C
In this paper, an experimental study for method of increasing the efficiency of electrostatic precipitator for the collection of submicron-sized particles has been studied. An AC electric field was used to induce agglomeration of bipolorly charged particles. A bipolar AC-agglomeration system, consisted with a multineedle-mesh discharge system with a control grid, was proposed and investigated. Systematic experiments were carried out to investigate the agglomeration ratio of the AC-agglomeration system as a function of the different grid spacings and grid resistances for the submicron particles generated from liquid prophane gas burning. The agglomeration ratios, which indicate the particle numbers before and after agglomeration of the test particles in number concentration base, were found to be 0.87, 1.80, 5.86, 9.50 and, 11.00 times for the particle sizes of 0.3, 0.5, 0.7, 1.0, and 2.0㎛ at applied voltage of 3.5kV, respectively, which showed that the fine particle numbers were decreased while the larger particle numbers were increase greatly.
문재덕,이종훈,이복희 대한전기학회 2004 전기학회논문지C Vol.53 No.5(C)
A high voltage pulse generator with a rotator airhole spark gap instead of a rotary ball spark gap has been proposed and investigated. Its feasibility as a high voltage pulse generator is compared with the rotary ball spark gap type one. Parametric studies showed that proposed the rotary airhole type spark gap had a very stable breakdown voltage and reliable pulse repetition time compared with the conventional rotary ball type spark gap. This however showed that the proposed pulse generator with a rotary airhole spark gap instead of a rotary ball spark gap could be potentially used as a very stable and reliable pulse generator in the various fields of applications.
슬릿 유전체 장벽을 갖는 선대 평판형 방전장치의 방전 및 오존 발생특성
문재덕,정재승 대한전기학회 2005 전기학회논문지C Vol.54 No.9(C)
A wire-plate discharge system with a slit barrier has been proposed and investigated experimentally by focusing on the discharges on the slit barrier and ozone generation characteristics. This wire-plate discharge system with a slit barrier can generate an intensive corona discharges, and produce corona discharge twice, once from the corona wire electrode and second time from the surface and the slits of the slit dielectric barrier. As a result, this proposed wire-plate discharge system with the slit barrier can produce greatly increased ozone than without the slit barrier. This type of wire-plate discharge system with the slit barrier could be used for effective ozone generation as a means with regard to the removal of pollutant gas
강유전체층을 갖는 선대선 방전 플라즈마장치의 코로나 방전 및 오존발생 특성
문재덕,신정민,한상옥 대한전기학회 2004 전기학회논문지C Vol.53 No.7(C)
A discharge plasma reactor using a ferroelectric pellet packed bed is now used as a removal means of pollutant gases, such as NOx, SOx and VOCs. When an ac voltage is applied to this plasma reactor, then the pellets are polarized, and great electric fields are formed at each top and bottom contact points of the ferroelectric pellets. Thus the points of each pellet become covered with intense corona discharges, where an electrophysicochemical reaction is taking place strongly. However these strong discharges also elevate the temperature of the pellets greatly and concurrently decrease the output ozone generation, as a result, the overall removal efficiency of gas becomes decreased greatly. A new configuration of discharge plasma reactor using a ferroelectric pellet layer and a wire-to-wire electrode has been proposed and investigated experimentally. It is found that an intensive microdischarge is taking place on the surface of ac corona-charged ferroelectric pellet layer of the proposed reactor, which concurrently enhances the efficiency of plasma generation greatly. And, this type of configuration of plasma reactor utilizing a wire-to-wire electrode and a ferroelectric pellet layer could be used as one of effective plasma reactors to remove pollutant gas.