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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.
金洪奎,趙武濟 충주대 산업과학기술연구소 2001 産業科學論文集 Vol.9 No.-
In power system substation facilities have become too complex and large according to extended power system. Also, some facilities become old and often break down unexpectedly. In order to improve the security of facilities, the technique, which has the ability to diagnosis substation facilities very well, is needed. In this paper, we developed a methods to be analysis the origin and degree of aging by KSOM(Kohonen Self Organizing Map) based on the dissolved gases in power transformer. KSOM can do topological mapping for multi-dimensional pattern like a dissolved gases to two dimension plan. And potential possibility and degree of aging for normal transformer are presented using the proposed quantitative criterion. Furthermore, the aging process of transformer is analyzed based on proposed criterion. to special transformer. To demonstrate the validity of proposed methods, case study is performed and its result is presented.
金洪珪,安壽泰 충남대학교 농업과학연구소 1987 農業技術硏究報告 Vol.14 No.2
This experiment was conducted to study plant characteristics and dry matter production of several rice varieties, The results are summarized as follows. 1. Culm length was gradually shortened as varieties were improved and showed significant decrease in Japonica Ⅹ Indica hybrids. 2, Panicle length seems to be shortened as varieties changed from group Ⅰ to group Ⅲ. However, varieties in group Ⅳ had longer panicle length in spite of shortening tendency in other groups. 3. Leaf blade length was decreased as varieties improved, but leaf blade width was increased. 4. Panicle exertion showed significant decrease as varieties improved. 5. Number of panicles per square meter among Japonica varieties was gradually increased and similar to the number of spikelets per panicle. Number of spikelets on Indica Ⅹ Japonica hybrids were higher than Japonica varieties, whereas 1,000 kernel weight was slightly decreased. 6. Dry weight of leaf sheath and culm, and leaf blade was highest at the time of heading and the weight of panicle showed significant increase between 10 and 20 days after heading. 7.. The maximum crop growth ratios of leaf blade, stem and panicles were attadined at the stage of i heading, booting and milking, respectively. 8. The distribution ratio of dry matter was higher in leaf blade than in stem at the tillering stage. A the heading stage, the distribution ratio of dry matter was higher in order of culm, leaf blade and panicle. At the maturing stage, the ratio was higher in order of panicle, stem and laf blade. 9. Correlation coefficients among grain yield, harvest index, and biological yield were all signific r and they were positive.
Thyristor를 利用한 Phase Converter에 關한 硏究
徐相壽,金洪奎 충주대학교 1979 한국교통대학교 논문집 Vol.12 No.2
According as the capacity and the load uced as frequent interval operation have increased in the rural district recently, it comes to be disadvantageous to used three phase transmitting system : on the other hand, it turns out to be necessary to adopt the phase converter in order to obtain two phase voltage or three phase voltage from the single phase source. Accordingly this paper is an attempt to inverstigate theoretically the single phase & therce phase phase-converters to operate the three phase induction motor in the area of single phase wire, and then to help select the suitable phase-converter by investigating each them comparatively.
金洪奎 忠州大學校 1988 한국교통대학교 논문집 Vol.22 No.-
The accident of electric equipment of high voltage customer has an effect on the transmission, distribution system of electric company, and breaks the stabilized balance. In this study I classified the accident types of hige voltage customer private electric equipment into short accident of phase, and ground accident of phase, and examined the protective relaying ststem design of hige voltage receiveing equipment to keep the electric power ststem from those accidents.