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이두수 전북대학교 공업기술연구소 1976 工學硏究 Vol.6 No.-
Log periodic dipole antenna has been designed on a trial-and-cut method. But it needs much effort and much time to design the antenna with preferable charactr-istics. This is the description of the design of log periodic dipole antenna by a computer if the specification, the number of dipole elements, the bandwidth and the boomlength, is given. This procedure is emphasized for the maximization of the antenna gain under the given specification.
Transcervical Embryo Recovery in Korean Black Goats: A Preliminary Experiment
이두수,김동우,신상태 사단법인 한국동물생명공학회 2015 한국동물생명공학회지 Vol.30 No.3
Four pluriparous Korean black goat does were superovulated with FSH and mated with fertile bucks. Anesthetized animals were placed in lateral recumbency, then size 8 Foley catheter was inserted into the uterus through the cervix under the vaginal speculum and the balloon was inflated to fix the catheter in the uterine body. The opposite end of the catheter was connected to a 3-way and a flushing medium was infused into the uterus. Modified Dubecco’s PBS with 1% FBS was used as the flushing medium. Four goats were allocated in two groups depending on the type of medium infusion into uterus. Injection group; the flushing medium was injected into uterus and the infused medium was collected by to-and-fro method using a syringe. Gravity-flow group; the flushing medium was allowed to enter the uterus by gravity flow by lifting the medium bottle and drained out of the uterus into a collecting tube. All four goats had catheter inserted through the cervix and uteri flushed successfully. The volume (recovery rate) of recovered medium varied considerably from 87 ml/200 ml (43.5%) to 148 ml/160 ml (92.5%). Nine embryos/ova in total were recovered from Gravity-flow group goats. Although the embryo recovery rate was low, the possibility of a transcervical embryo recovery in Korean black goat had been proven in this preliminary experiment.
음성카셋트 녹음장치에 있어서 아날로그-디지탈 신호변환에 관한 연구
이두수,정태원 전북대학교 공업기술연구소 1979 工學硏究 Vol.9 No.-
Audio cassette tape systems have been used as the auxiliary storage devices of mini/micro computer. They have various kinds of advantage as the devices. But, in their conventional application to the computer storage, the systems have difficulty to obtain clock pulse from the recorded signal on the tape by the FSK recording method. In this paper, an approach for designing an electronic network easily deriving clock pulse from the FSK signal is described and the characteristics of the designed network is measured. thesatisfactory result is obtained.
이두수 전북대학교 공업기술연구소 1975 工學硏究 Vol.3 No.-
A waveguide mode in a circular waveguide is called the dominent mode if it has the lowest cutoff frequency for a given dimension. It is analytically investigated that TE_11 mode has the lowest cut off frequency for a circular waveguide. When TE_nm wave is propagated in a circular waveguide, the power transmitted is attenuated because of skin effect on the circular wall of the waveguide. The dependance of the attenuation factor of TE_nm mode on the frequency of applied wave and on the radius of the wave guide is presented graphically. And this paper will provide the reader the clear and detailed presentation for wave propagation through a circular waveguide.