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B모드 超音波 診斷機의 誤差補正 : 두께 測定을 中心으로 Centering on the Thickness
박종백,문규성 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.2
In medical appliance of B mode ultrasonic diagnosis apparatuses, on the supposition that regarding non-linear mediums of body as linear ones makes the difference in the measurement of distance, a model of non-linear medium was designed by accumulating in the axial direction the phantoms which were made of respectively different mediums in density, and the measurement by axial resolution of the apparatuses confirmed the difference in the measurement of distance. In order to know the rate of difference according to the ultrasonic propagation velocity in respectively different mediums in density, the curves of the difference correction according to the ultrasonic propagation velocity are presented by measuring the density of every medium and the ultrasonic propagation velocity.
박종백,박광채 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.1
The existing auxiliary memory units have complex file structures since magnetic materials are sued as storage cells which usually have long access time because they must use complicated control units. Therefore, very poor utility factors are resulted wuth such units. In order to overcome the defects of the existing auxiliary memory units, it is ssary to develop the auxiliary memory units semploying 64KDRAM (Dynamic Random Access Memory) as semiconductor mass storage units. In this paper, a study is made on the availability and effectiveness of the auxiliary memory units using the 64 K DRAM. The results are as follows : 1) The file structures can be made very simple because this system can be applied to the structures of the random access file. 2) This system reduce access time by using DMA Controller while existing RAM disk units can access to the memory through I/O port. 3) This system can accomplish maximum memory utility factor by removing the gaps between files through the improvement of the file structures.
朴鍾伯,晋達福 朝鮮大學校 1976 綜合論文集 Vol.1976 No.-
To study on the speaker identifying device, the electrical models of auditory system were dealt in this paper. The models are composed of the following; a 140-section band pass filter representing the basilar membrane; half wave rectifiers representing the hair cells; and a neuromime representing the auditory neurons. Experiments on these electrical models were performed. Holmand frequency ratio was proposed as a characteristic parameter in the experiments. As a result of experiment, the speaker could be identified through the voice sample of single vowel.
朴鍾伯,朴光埰 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.1
A new type of four-quadrant analog multiplier is proposed. Compared to the conventional time-division type multipliers, it does not require a triangular wave generator and thus it is quite simple. Unlike time-division multipliers based on the charge equalization principle, it immediately reaches the steady state when one particular signal changes from one value to the other. Experimental results agree well with the theoretical predictions. Improvements towards better accuracy and faster response are suggested.
TV放送局 SYSTEM의 MONITOR 開發에 관한 硏究 : 광주방송국을 중심으로 Centering on Kwang ju Broadcasting Station
박종백,박광채 조선대학교 동력자원연구소 1984 動力資源硏究所誌 Vol.6 No.2
System monitor using PC-8001 microcomputer was developed for the error detection and the emergency recovery in broadcasting instruments in TV broadcasting station. It was shown that this system could control the office management and the monitoring on air smoothly because of its conservation of the original functions of computer to maximize the effect of computer system as possible. By this system interfacing with wordprocessor it can be used as a TV title generator and therefore it will contribute greatly to massive and high speed message communication.
朴種伯,朴成敎 조선대학교 생산기술연구소 1991 生産技術硏究 Vol.13 No.1
In this paper the diffraction effect is investigated in a systematic way using the shape function on the transducer shape and observation point. The frequency dependent attenuation is estimated by eliminating the errors caused by the diffraction effect. The results indicate that the proposed method improves the accuracy of the estimated value. The group delay function for a pulse-echo signal is also derived from the phase of the Fourier transform of the signal. The mean value of group delay function corresponds to the slope of the linear phase component in the phase function. Therefore the dispersion effect contained in the pulse-echo signal is eliminated by measuring the group delay function. The estimated value by the proposed method is more accurtae than that by the conventional method, resulting in error that is about 0.46% smaller.
朴種伯 조선대학교 생산기술연구소 1981 生産技術硏究 Vol.1981 No.-
A Study is made on the design of a Super gain antenna for Gwang-ju MBC TV-FM broadcasting as well as the way of compensation of electric field at such weak field areas as Yosu and Sunchon. By introducing some parameters such as Q, χ(frequency ratio) and y(R-Xratio), necessary equations are derived to determine the antenna sizes and shorting bar position which meet the design conditions. It is necessary to construct a new relay station on Mt. Kubong in order to solve the problem of weak electric field at the areas.
MOSFET 동기정류회로의 특성 고찰 : S.M.P.S.에서 In S.M.P.S.
박성교,박종백 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1
To improve the rectification efficiency, designed S.M.P.S. were fabricated by replacing diodes with power MOSFETs. The characteristics between these S.M.P.S. and existing diode-type S.M.P.S. at a load of 2.5[A]and 5[A] were compared. The results represent that independent synchronous gate-driven half bridge MOSFET rectifier obtaines a little increased total rectification efficiency, that is, increased 4.84% at a load of 2.5[A] and 1.55% at a load of 5[A] and self synchronous gate-driven flyback MOSFET retifier obstaines a little incerased total rectification efficiency, that is, increased 2.49% at a load of 2.5[A] and 3.47% at a load of 5[A], than diode-type S.M.P.S..