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RISS 인기검색어
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- 저자 : 文在德 (검색결과 149 건)
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문재덕,정석환 ( Jae Duk Moon,Suk Hwan Chung ) 한국센서학회 1998 센서학회지 Vol.7 No.2
Methods and systems to remove static electricity are requested necessarily because the static electricity causes a flammable gas explosion, a fire, reduction of production rate in manufacturing VLSI semiconductor device and so on. In this paper, abrasion and dust contaminant of needle electrode are studied experimentally. And, frequencies and pulse durations of a high frequency pulse source were controlled effectively to minimize the abrasion of needle electrode and control generated numbers of ions. As a result, it is verified experimentally that the ion generation of charge neutralizer increases by using a high frequency pulse source.
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고농도 오존발생장치의 첨가가스가 오존발생특성에 미치는 영향
문재덕,박승록,김진규 경북대학교 전자기술연구소 2001 電子技術硏究誌 Vol.22 No.2
Ozone has been widely applied to many industrial fields because of its strong oxidation power. There are many factors to affect to ozone generation and yield. An additive gas acts as increasing and/or decreasing three body to ozone generation and decomposition. In this study, an ozone generator utilizing a mesh type electrode as an effective discharge electrode was proposed and manufactured for high concentration ozone generation. And the effects of additive gases on ozone generation were investigated. As a result, when the additive nitrogen gas was mixed to the input oxygen gas from 0.0[vol%]∼6.4[vol%] the highest ozone concentration of 73135[ppm] was obtained at 0.8[vol o] of nitrogen gas, which is 3(%) increasing compared with the case of pure oxygen inlet. When the additive argon gas was mixed to oxygen gas from 0.0[vol%]∼6.4[vol%] the peak concentration of 67288[ppm] was obtained at 0.8[vol%] of argon gas, which is 5[%] decreasing compared with introducing the pure oxygen without additives.
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문재덕,정재승 대한전기학회 2006 전기학회논문지C Vol.55 No.6(C)
- In this paper a new wire-wire discharge system with a slit dielectric barrier has been proposed, and, its corona discharge and ozone generation characteristics have been investigated experimentally. When the slit mica barrier is installed between corona wires, instead of the grounded plate electrode, a significant increase in the generation of ozone, about 2.2 times higher than that of the conventional ones without the slit barrier, could be obtained. Photographs show that this type of discharge system with a slit barrier was found to produce a corona discharge twice, once from the upper and bottom corona wires, and, again from both sides of surfaces and slits of the slit barrier. As a result, the proposed discharge system has the potential to increase significantly ozone production and it may be useful as an effective means for removing pollutant gases.
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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.
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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.
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소형 (小型) 정전 (靜電) 유도형 (誘導型) 모터의 기초연구 (基礎硏究)
문재덕,이동훈 ( Jae Duk Moon,Dong Hoon lee ) 한국센서학회 1993 센서학회지 Vol.2 No.1
A miniature size electrostatic induction motor has been fabricated and studied with emphasis on the role of the surface resistivity, the relative dielectric constant and the charge relaxation time constant of the rotor surface materials and the rotor liner materials, which, however, control the surface charge induction and relaxation on the rotor material surface and the field intensity between the rotor and the stator of the motor. It is found that the surface resistivity and/or the relative dielectric constant, and the charge relaxation time constant of the rotor surface material enfluenced significantly to motor speed controlled by the surface charge induction and rela cation on the rotor surface depending on the applied voltage and/or frequency changing. The resistivity of the rotor li a r material is also found to be effected to the motor speed greatly by control of the field intensity between the rotor and the stator and of the surface charge distribution of the induced charge on the rotor. As a result, a maximum no load rotor speed of the motor tested was about 5500 rpm at the applied voltage of 4.5 kV and the frequency of 220 Hz for the case of the rotor surface material of BaTiO₃ 80% in the resin binder layered on the copper-foil rotor liner material.
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