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공재향(Jae Hyang Kong),박광호(Kwang Ho Park),권우철(Woo Chul Kwon),윤준용(Joon-yong Yoon) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.1
Items and methods of synchronous type AC servo motor’s performance evaluation were researched. Through the research, nine items of performance evaluations were selected from study of IEC standards and domestic technical reports. Using the proposed evaluation items and methods, performance evaluations were carried out into two domestic products and one foreign product for analysis of what results means. The results show that the proposed items of performance evaluations are reasonable and proper for performance evaluations of AC servo motors.
공재향,신병국 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.1
There have been many studies on generation equipment and plant piping, but there is no significant study result on the heat transportation pipe. As such, this study established basic theory on the compensated method among buried pipe for regional heating, and further obtained the following results by applying the conditions of AGFW and NCHPP respectively in calculation of friction and maximum installation distance for the buried pipe. Friction coefficient according to the types and physical properties of soil, friction and maximum installation distance were compared to set the application value of friction coefficient according to the location of works. Calculation formula of clay load to be applied for calculation of friction was introduced to the formula of AGFW and the formula of NCHPP that has been used in Nowon district since 1997 to determine the difference and applicability. 120℃ and 95℃ were applied in temperature difference for expansion volume to compare the arm length at the curve pipe so that it can be reflected in the design in the future. Maximum installation distance according to thickness of pipe was compared to present the necessity of unified specification so that same kinds of pipe materials can be used for same kinds of works.
국제표준에 대비한 국내 비자동저울의 품질평가에 관한 연구
남궁재관,공재향 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.6
As the result of reduction of the barrier of national economy on matters of quality assurance of weighing instruments in recently, it is considering in domestic as well as international matters. Therefore, this study is to analysis and compare with international and national measuring standards on the electric self-indicating scale, to improve the quality of electronic machine by providing a reformation plan on currently problems of domestic manufactured, and to identify to introduce in domestic criteria from international standards. I had compared KS C 1313 to OIML R 76-1 as the performance assessment items, such as metrology properties test, static temperature test, temperature effect testing under the un-load, electronic wave disturbance test, high-temperature and high-humidity stability test and durability test. Therefore, only one company is passed all items of the test according to the international (reference) standards, but it is possible to improve the quality in general if it should be use the load cell and electric components which is stability of temperature change in order to supplementation to the static temperature test and temperature effect testing under the un-load. It is also possible to apply in the domestic with the OIML 76-1 after correcting the design.
남궁재관,김홍원,공재향 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
This study is to improve the quality of electronic weighing machine by providing a reformation plan on currently problems of domestic manufactured nonautomatic weighing instruments, and by test items and criteria considering internal situation, on base of identification of quality level of domestic manufactures electronic weighing machine according to the international standards.
유봉환,유은이,사승윤,이명재,공재향 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
In computer vision system of modern industry, precise measuring has of dfficulties because of measurement error due to distortion phenomenon. Among the difficulties, the distortion of edge is regraded as a dominent problem, which is caused by the blurred image. The blurred image appears when camera can not discriminate its precise focus. So, it is very important to decide focus of lens and to develop algorithm in order to correct distortion phenomenon. Thus, discrimination criteria obtained by image information of precise focus must be fixed in advance. The gray level histogram of image acquired from blurred edge tends to show a uniform distribution. Bimodal intensity histogram is related with condition of focus, and it is possible to find good condition of focus by using bimodal histogram of entropy.
국제기준에 의한 국내 비자동저울의 품질 평가에 관한 연구
김홍원,남궁재관,김창열,공재향 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
This study is to improve the quality of electronic weighing machine by providing a reformation plan on currently problems of domestic manufactured nonautomatic weighing instruments, and by test items and criteria considering internal situation, on base of identification of quality level of domestic manufactures electronic weighing machine according to the international standards.