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Pre-aging 처리에 따른 316 스테인레스강의 크리프성질에 관한 연구
김홍규,유연철 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.12
The influence of pre-aging treatment on the creep properties in AISI 316 stainless steel has been investigated in the temperature range of 923∼1023 K and stresses in the range of 130∼228 MPa. Specimens were pre-aged at 1073K in air atmosphere up to 300 hours to clarity the effects of pre-aging time on creep rate. The steady state creep rate and the rupture strain increased with pre-aging treatment while the rupture time decreased with pre-aging treatment. Creep rate acceleration with pre-aging time could be described by ◎ =1.6686×10^(-4) t^(0.865) where t is the pre-aging time in seconds. Creep rate acceleration for pre-aged specimens was not strongly influenced by temperature and stress changes. Activation energy for creep decreased with pre-aging treatment and stress exponent represented by power relation increased with pre-aging time.
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金洪奎 忠州大學校 1980 한국교통대학교 논문집 Vol.13 No.1
With the recent increase of the national income, the house-reforming movement has been developing very vividly as a part of now village movement. In this study I investigated the proper plan and the economical equipment for illumination in the reformed farm house according to the standard housing plan of the farm village, and then suggested in partial reform and constitution of the Korean Industrial Standard.
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金洪奎 忠州大學校 1986 한국교통대학교 논문집 Vol.19 No.2
In this paper the transformer loss reduction is studied by way of connecting in series the parallel running transformer at light load and connecting in parallel as it is at heavy load. As a result of this experiment, it is proved that the loss reduction come to be 52 percentage when the transformer operates in no load and 27 percentage in light load operation of transformer.
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직류 서보 시스템 제어를 위한 퍼지 제어기 설계에 관한 연구
金洪奎 忠州大學校 1994 한국교통대학교 논문집 Vol.29 No.2
This paper proposed the revisal fuzzy control system based on PD control scheme to design robust controller for speed control of dc servo motor. The system introduced two types of fuzzy compensate strategy and amplifier that the output of the fuzzy controller has a continous and linear function to ensure of robustness. Two types of fuzzy compensate strategy are presented; the one is by the influences of scaling factors, the other is by numbers of fuzzy control rule. We proved its robustness through digital simulation and experiment by three of estimation element.
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金洪奎 忠州大學校 1982 한국교통대학교 논문집 Vol.15 No.2
A study on the Improvement in Efficiencies Recent increasing in energy conservation has resulted in efficiency of many types of electrical and mechanical equipment and systems. One of the prime areas of efficiency consideration is that of the conversion of electrical to mechanical energy. Electric motors are utilized to such a great extent that even if modest improvements in the efficiencies of their operation were to be implemented, this would in time have a significant impact on energy conservation. This paper presents a comparison of efficiencies and characteristice of some sizes and designs of small single phase induction motors as a function of voltage and load. These motors were considered because the efficiencies of many of the standard designs are often relatively low compared to larger motors and three phase motors in general. of Single Phase Induction Motor
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金洪奎 忠州大學校 1985 한국교통대학교 논문집 Vol.18 No.2
Three phase induction motor, which is widely used in modern industrial societies, is operated by balanced three phase voltage in principle. In some cases, however, there may be unbalanced or even, in an extreme case, single phase supply voltage in accordance with power line. This paper examined and illustrated that if three phase induction motor is supplied with unbalanced voltage, how much the induction motor is influenced for bad by this and what loss it will suffer.
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金洪奎 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1
Recently, Electric Power Convert Device have been widely used for Power supply field as well as industrial plants, because of its advantages such as high efficiency and lower voltage drop and so on. however, it has some problem, harmonics wave have influence on other load connected power system and Electonic device, communication, signal line etc. In this paper, a reducing method of Harmonics involved in AC power system of the 6-pulse full bridge converter is discussed.
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퍼지 論理를 利用한 슬라이딩 모드制御 方式에 의한 직류 서보 電動機의 速度制御에 關한 硏究
金洪奎 충주대학교 1992 한국교통대학교 논문집 Vol.26 No.-
A new control system so called Fuzzy sliding mode control method is proposed to control the speed of DC Servo Motor. This system is introduced Fuzzy algorithm by new swithing logic of control input rule to approximate the ideal sliding mode and simplify the problem of control gain in a conventional VSC strategy. Also, we proved the validity of the system through computer simulation.
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