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- 저자 : 朴奉斗 (검색결과 42 건)
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朴奉斗 慶北大學校 1976 論文集 Vol.22 No.-
The Permittivity of free space, ε_0, has been measured using the electronic switch of the astable multivibrator, and obtained a good agreement with experiment within 0.6% errors.
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朴奉斗,朴德圭 慶北大學校 師範大學 1974 敎育硏究誌 Vol.16 No.-
Statistics for the photon noise was checked and a relatively simple apparatus for the oservation of photon noise was constructed. We observed pulse shapes of photon noise and calculated noise voltage, anode current, counting rate and photoyield factor of RCA 931A PM tube. Also we checked the best condition for the measurement of photon noise.
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科學敎育의 學習指導改善을 위한 硏究 : 日本에서의 CAI를 中心으로
朴奉斗 경북대학교 과학교육연구소 1987 科學敎育硏究誌 Vol.11 No.-
The Present features of computer assisted instruction (CAI) particulary on physics education at middle and high school in Japan are described. Personal computer become a "standard equipment" on most school that helps teachers teaching more effectively and the use of this as an educational aid is potentially capable of giving each student individual totoring, but its use has been limited because there are not yet enough to readily available and comprehensive suitable programs designed for instructional purposes. Illustrative examples with BASIC programming were presented.
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朴奉斗 慶北大學校 師範大學 1972 敎育硏究誌 Vol.14 No.-
The turn-off characteristics and the measurement of turn off time of high speed switching SCR which is only included the reverse blocking triode thyristor are described. The changes between turn off time t_off and forward anode current I_F, and ambient temperature, were measured with CRO. It is observed that t_off is approximately proportional to ambient temperature squared if I_F is not exceeded of rating on state current.
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朴奉斗,韓聖愚,尹志洪 慶北大學校 産業開發硏究所 1979 硏究報告 Vol.7 No.-
Cu-Ni thin films deposited on the glass by the vacuum evaporation method containing various concentrations of Cu have been studied its thermoelectricpower and electromotive force in the temperature range of 25―220℃. The thermoelectromotive force of pure Ni depends on the thickness of films to 1800, A° but Cu_0.8 Ni_0.2 to 1600A°. Cu―Ni films containing 15,20,25% of Cu were observed the effect of magnetic disorder. The variation of thermoelectricpower appeared in variious concentrations of Cu, its maximum value is 40μV in 45% of Cu. The linear dependence of thermoelectricpower on the temperature showed from 50% to 90% at concentration of Cu.
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朴奉斗,尹志洪 경북대학교 과학교육연구소 1980 科學敎育硏究誌 Vol.4 No.-
An investigation of the thermoelectric power of ZnSb and its thin films has been made in the temperature range between 300˚K and about 800˚K. The general method of measure ment is the determination, through thermocouple readings, of the ration ΔE/ΔT, where ΔE is the thermal emf measured between two points in the sample having a temperature difference ΔT. The thermoelectric power is varied with the temperature of the sample. The thermoelectric power of the ZnSb thin film has maxinum value at 600˚K.
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敎育用 Analog Computer의 製作과 그 應用에 關한 硏究
朴奉斗 경북대학교 과학교육연구소 1979 科學敎育硏究誌 Vol.3 No.-
Educational Analog Computer has been designed and built as an educational device aided towards a more easy to use to understanding the fundamental concept of analog computer, and to build a simple low cast computer which is capable of solving the second-order linear ordinary differential equations with constant coefficients, and to introduce some technology-control engineering and a simple servo mechanism. The computer consist of the only linear computing elements, five summary amplifiers and three integrators with producing timing intervals. General-purpose integrated circuit ㎂-741C are used except a timing circuit. Switching from the input in the op. amp. to integrator was achieved using a SCR turn off characteristics connected with UJT. timing circuit in DC operation. Detailed information on construction methods is given.
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朴奉斗 慶北大學校 1968 論文集 Vol.12 No.-
Nkckel magnetostiection Dscillator has been designed for the study of analyzing the resonance frequency and for the use of drilling effect for hard materials.iIn order to operate the Nickel pile oscillator, with 15cm length, 4cm width, and 4.2 cm thickness, was drivend 300 watts power exciter with 810 parallel Power tubes. The reson-ance frequency is 15850c/s and most suitable d.c magnetic bias is 120 ampere-turn in temperature 15℃.
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添加酸化物이 Ni-Zn Ferrite의 電氣 및 磁氣的 性質에 미치는 影響
朴奉斗,南寶植 慶北大學校 産業開發硏究所 1982 硏究報告 Vol.10 No.-
The variation of electromagnetic properties on Ni-Zn ferrite with additive oxides (As_2O_3, Bi_2O_3, and SnO) was measured with Hysteresis Loop Tracer at this sintering temperature range of 1150℃∼1350℃. The experimental results indicate that specific resistances were 0.3×10 exp (5)-2.8×10 exp (5)Ω ㎝, and the maximum initial permeability μ_i was 210 H/m, the maximum permeability μ_m 2450^* H/m, the maximum residual magnetization Br 900 gauss, and the minimum coercive force Hc 0.35 Oe. The loss coefficient shows that the additive oxides have Low value (1.3×10 exp (-4), at 2.5 MHZ) compared with the non-additives calcinated at 1250℃.
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朴奉斗,尹志洪,韓聖愚 경북대학교 과학교육연구소 1978 科學敎育硏究誌 Vol.2 No.-
Quantitative analysis of the static electricity charged on the water dropper has been performed with an electrometer and recorder. Experiments were carried out over various parameters such as nozzle diameter, water pressure, different kinds of liquids and temperature with time. The accumulated charge on the cans of the water dropper was related to the size of nozzle outlet and hydrostatic pressure, but were independent of the temperature of liquids. There was no charge, of course, on the nonpolarized molecules such as C_6H_6, CCl_4, and kerosen fuel.
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