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두께진동 수정공진자의 Crystal Impedance 특성 개선에 관한 연구
李大勳 忠州大學校 1985 한국교통대학교 논문집 Vol.19 No.1
The Equivalent constant Rl of Crystal Resonator is defined as Crystal Impedance and is under the control of Q value at Quartz Crystal. This thesis examined on 1) the is of Q value and C-I improvement, and 2) Presented the improve method of C-I characteristics by Vaccum arrengement.
李大勳,金長坤 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-
In this paper, the DES(Distance Education System) based LAN, using IIS(Internet Information Server), is designed and implemented.It is used not only a small scale school but also a large scale school, and It is easily adapted new pattern courseware designed by new teaching skill.
Bevelling이 水晶振動子의 特性에 미치는 影響에 關한 考察
李大勳 忠州大學校 1982 한국교통대학교 논문집 Vol.15 No.1
The writer studied on the Bevelling of crystal blank which has an effect in the characteristics of thickness vibration crystal resonator, and ascertained through the experiment the effect which the change of spurious responce by Bevelling has on the characteristics of filter.
측면자극 DC필드에서 수정진동자의 두께 모우드에 관한 연구
李大勳 忠州大學校 1991 한국교통대학교 논문집 Vol.25 No.-
The fundamental thickness modes of a quartz plate resonator of orientation (XZIW)105.07/9.24 with frequncies of between 2.6 and 4.9 MHz were studied under the effect of a dc electric field E applied to the body of the resonator in the lateral direction, For each mode of vibration ensuing fuequency changes depend on the direction of the DC field. For dc fields of fixed directions, the fuequency dependance was found to be predominatly linear, with (1/f) (df/dE) at E = 0 of the order of 10 Vm was also detected. This compared well with the magnitude of the same phenomenon known for the dc fields applied in the thickness direction of quartz resonators in genaral.
李大勳 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.2
I compared the three TCXO Characteristics. Firstly we investigate temperature compensation methods. And described the Load capacitance variable compensation, TTC-cut compensation and digital TCXO method. Finally I anlayzed each temperature compensation method problem.
李大勳 忠州大學校 1995 한국교통대학교 논문집 Vol.30 No.2
I described in this paper the general characteristics of new cutting(TTC-cut) method crystal resonator and advantages when it is used for OCXO. 1) To describe TTC CUT AND T-F characteristics. 2) TTC-cut shows far better effect than AT-cut on thermal shock, frequency stability and frequency change. 3) We can get compensation characteristics and the good moment with in 1ppm in using resonator for OCXO.