http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
司空鍵 영남이공대학 1977 論文集 Vol.6 No.-
This paper investigates the relative equation between the melting current and diameter of the thread fuses which are manufactured in Korea. By the research the main results obtained as the following. 1) The relative equation between the melting current I and the diameter d of thread fuses is I=ad 3/2(here a is the constant value) 2) The equation is I=ad7/5 by means of manufacturing process in Korean goods. 3) The constant a of Korean products is about 7.203 to 12.623. 4) The melting time of the rating current 5A twofold fuse is shotter than the rating current 10A fuse.
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.
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℃.
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,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.
司空鍵 영남이공대학 1978 論文集 Vol.7 No.-
This paper describes the various characteristics of improved parallel center-tap type Inverter which is trial manufactured. By the experiment the main results obtained as the following. 1) It is easy to convert frequency by using of relaxation oscillator circuit with UJT. 2) It is possible to control the speed smoothly over a wide range by frequency control. 3) The output voltage wave is distorted by means of the higher harmonics. at inductive load. 4) The phase and magnitude of output voltage change by means of varying load power factor. 5) The suitable L is about 2mH to 4m1I, and C is about 0.21tF to 0.9? on induction motor of which the power is 9 [WI].
Overall Illuminance Uniformity of IRED Lighting in Nighttime CCTV
사공건,박영준,박정제,이수호 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.1
This study looks at optimizinge light redistribution to improve the overall illuminance uniformity of commercial IREDmodules. To obtain uniform illumination over a prescribed rectangular area, a freeform surface lens was evaluatedusing TracePro. The LED light overall illuminance uniformity regulated in KSC 7658 was verified using Relux software. Experimental test results showed 0.81 overall illuminance uniformity for rectangular light distribution of LED lightshaving a radiation angle of 80°. After fabricating prototype IRED lights based on these simulation results, illuminanceperformance was observed when used as actual IRED lighting with a nighttime CCTV system. Image observationphotographs of the prototype 80° rectangular IRED lights confirmed that object images can be seen clearly owing tohigh overall illuminance uniformity, and that dark regions of the CCTV screen were not shown.