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Cu_0.28Ag_0.72InSe_1.4S_0.6 薄膜에 關한 硏究
鄭海德,朴桂春 木浦大學校 工業技術硏究所 1991 工業技術硏究誌 Vol.1 No.-
The polycrystalline Cu_0.28Ag_0.72InSe_1.4S_0.6 thin films are prepared by vacuum heat treatment of layer, which is deposited by direct resisting vacuum evaporation. From optical absorption spetra, the optical band gap energy is determined to be 1.5[eV] at room temperature. From electrical method, hole concentration, resistivity and mobility are 9.3*10^18[㎝^-3], 6*10^-2[Ωㆍ㎝], 11.2[㎠/V.sec] respectively at room temperature.
하이퍼미디어 시스템을 기반으로 하는 CAI도구의 설계 및 구현
정해덕,황치정,진성일 충남대학교 자연과학연구소 1992 忠南科學硏究誌 Vol.19 No.1
This thesis is designed and implemented for an authoring tool of CAI (Computer Assisted Instruction) of the human body structure, by means of the Hypermedia system. Also, the stack structure of the human body structure is designed and implemented in an object-oriented concepts and in a combination stack structure that mingles a tree stack structure with a network stack structure. If an authoring tool of this CAI is enlarged, it has a wide variety of applications. It can be utilized, for example, in educations, in desk announcements, in information services, in marketings, in quick-lunch room businesses, and in entertainment businesses. Additionally, if an authoring tool of this CAI is put into practice, it will curtail expenditure on both personnel and equipment, and will save time. In addition, it will result in an increase in users' attention, understanding, memory, and concentration.
鄭海德,李進,張永學 木浦大學校 工業技術硏究所 1991 工業技術硏究誌 Vol.1 No.-
This paper describes an effort to develop a microcomputer-based parameter identification system for a brushless D.C.motor driven by three phase trapezoidal current. It is found that Pasek’s equation is valid for the brushless DC motor driven by three phase trapezoidal current. Back EMF equation is derived from back EMF waveform of brushless DC motor driven by three phase trapezoidal current and it is verified that the voltage constant obtained by back EMF equation and the torque constant are equal, in the pure SI metric system. To minimize errors due to the ripple component in the measured armature current, digital averaging filter is employed. The algorithm is implemented on IBM-PC/AT using C language. In the proposed method, the measured current is in excellent agreement with the calculated current. And this close agreement conform the validity of this technique.
정해덕,박계춘,조재철,정운조,김성구 木浦大學校 工業技術硏究所 1992 工業技術硏究誌 Vol.2 No.-
The polycrystalline CuInS_2 thin films are prepared by vacuum heat treatment of layer, which is deposited by vaccum evaporation in order. The electrical and optical properties of the films are investigated at various sulfur deposition mole rate, substrate temperature, heat treatment temperature and time. From data, n type- CuInS_2 exhibits resistivity, transmittance and energy band gap with 142[Ωㆍ㎝], 73[%], and 1.5[eV] respectively at optimum fabrication condition. Finally, the films are fabricated with chalcopyrite structure.