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사공열 漢陽大學校 1979 論文集 Vol.13 No.-
The absorption rates of methanol, acetone and methlacetate vapor through the monomolecular layers of tetra-, hexa-, and octadecanol on water surface were measured under lower pressure and at room temperature. The initial rates are fitted to the first order kinetics with respect to vapor concentration and the rate determining step is the processing through the monolayer film. The apparent activation energies calculated from the rate constants at different temperatures are shown in table 2. It was found that the appareent activation energies increase linearity with increasng cross sectional area of the permeant molecule.
사공건,전홍배,허 진,김철한 東亞大學校 2001 東亞論叢 Vol.38 No.-
In this study, a measuring system of the initial permeability of soft-ferrite powder is developed by using a linear variable differential transformer's coil, and investigated about a demagnetizing factor. Magnetic powder is extensively used for a magnetic fluid and microwave absorber's materials etc.. In these applications, it is significantly important for us to measure an initial permeability of magnetic ceramic powder. Unfortunately, there are not any measuring equipment and method directly up to the present.
X-band용 Ni₂Y/Rubber 복합형흡수체의 정합조건설계
사공건,신광호,김한근 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
The absorption properties of ferroxplana/rubber composite microwave absorbers were evaluated. The composite specimens have prepared by molding and curing the mixtures of matrix rubber and ferroxplana ferrite powders used as a filler particle which were synthesized by the coprecipitation method using BaCl₂·2H₂O, NiCl₂·6H₂O and FeCl₃·6H₂O. We have figured out the matching conditions of the Ni₂Y ferroxplana/rubber composite specimens from the impedance matching map and boundary map. On the composite specimens, we have found that the reflection losses were larger than 20[dB] from 8.7 to 10.9[GHz]. As a results, the Ni₂Y/rubber composite absorber would be applied for x-band frequency applications.
면취기 시스템에 있어서 부하의 관성모멘트에 따른 가변 PID 일정 장력제어의 기초연구
사공건,허 진,전홍배,김철한 東亞大學校 2001 東亞論叢 Vol.38 No.-
In the winding system, the constant tension control is too important. In this study, we've investigated about a variable PID system as a function of a radius of winding roll. As a result, it was possible to measure a winding roll radius in the real time by making a mathematical model for measuring a winding roll radius. Finally, we've compared PID parameters as a function of winding roll radius after getting PID parameters in terms of the Ziegler & Nichols(ZN) method.
사공건,박연준 東亞大學校 2003 東亞論叢 Vol.40 No.-
In order to get the infrared ray radiator with high efficiency emission, the starting raw material Fez03 powder is heat-treated under the oxygen pressure log[PO_(2)]= -13 -15 at 800℃ for 2 hours. It has shown that the radiation rate was larger than 0.85 at the relatively high temperature(400℃), and almost kept constant the radiation rate with increasing the temperature from 50 to 400℃.
Zn의 조성비에 따른 Pb(ZN Nb)O₃세라믹의 전기적 특성
사공건,이수호 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-
In this paper, Pb(Zn Nb₁)O₃ceramics were fabricated by the mixed oxide method. The sintering temperature and time were at 1,100(※) for 1(hr). According to the contents of ZnO₂, the depression of pyrochlore phase and its effects were investigated. As a results of the XRD and SEM experiments, the pyrochlore and second phase were increased with increasing the ZnO₂contents. Increasing the ZnO₂, the density was decreased.
압전 세라믹(PZT)의 미세 구조에 미치는 첨가물의 효과
사공건,이수호 東亞大學校 大學院 1993 大學院論文集 Vol.18 No.-
In this paper, we have studied about the microstructure of the piezoceramics PZT that were added with some kinds of addiives, such as Niobium(Nb), Iron(Fe) or Manganese(Mn). The grain size of PZT ceramics was decreased with increasing the amounts of additive of Nb or Fe, while increased with increasing Mn. The curie temperature was changed slightly for the PZT ceramics containing FE?, which is not dependent on the amounts, but Nb? or Mn? ion added PZT was lowered. The resistivity was increased with increasing the amounts of Nb? additive, while decreased for Mn? additive.
세라믹/고분자 1-3형 복합압전체 초음파 트랜스듀서를 사용한 근접거리변동 측정용 레벨Limit스위치에 관한 연구
사공건,김흥근,박경일 東亞大學校 2003 東亞論叢 Vol.40 No.-
In this study, an ultrasonic transducer is fabricated with 1-3 type composite resonators. Pulse-echo responses of an ultrasonic transducer are investigated in underwater dependent on the variable designated water-level. LED Output signals of a level limit with changing a water level are obtained by the 1-3 type self-made ceramics/polymer composite transducer and electric measuring unit. LED is turned on at above the up-limit level with increasing a water level, and LED is turned on at less level than the down-limit level with decreasing a water level. There was good agreement between the virtual water level and output LED signal by using the self-made water-detecting system.
사공건,김흥근,신광호 東亞大學校 2004 東亞論叢 Vol.41 No.-
This paper is focused on the improvement of reflection angle of an optical scanner by changing a shape of a torsion bar attached with an optical scanner reflector(mirror). In order to improve the light efficiency of the optical scanner by virtue of the magnetic effect, which tiny magnets are attached under both ends of the optical scanner reflector. and hence the optical scanner reflector was operated in relatively lower driving voltage. By changing the torsion bar's shape I type into S type, we've got the lower resonant frequency(32.5Hz) of an optical scanner than that of conventional one(50Hz). According to these results. The reflection angle of an optical scanner with magnets was much larger in the range of about 14.8° compared to one without a magnet. By making use of a magnetic actuator instead of a conventional electrostatic actuator, the optical scanner was less influenced from outdoor dust or moisture.
士官學校 體力檢定 種目의 評價基準에 關한 硏究 : 變更種目을 中心으로 Centering on the new Subjects of test
司空詰 慶北大學校 師範大學 1982 體育學會誌 Vol.8 No.-
The purpose of this study is establishment to the new evaluation standards of physical fitness test items for the need of military academys entrance examination and physical fitness promotion of soldiers. Measuring subjects used in this research consisted of 84 second year cades from the Third Military Academy, and measuring items were 100m sprint, standing long jump, pull ups, 2,000m run, harvard stem test, agility run, trunk extension, and wall pass. As a result of measurment, the most appropriate of the new evaluation standards of physical fitness test items are summarized as follows; ◁ 표삽입▷ (원문을 참조하세요)