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김영헌 ( Yong Hyen Kim ),정종수 ( Jong Su Jeong ),이진원 ( Jin Won Lee ),이규원 ( Gyu Won Lee ) 전북대학교 공업기술연구센터(구 전북대학교 공업기술연구소) 2006 工學硏究 Vol.37 No.-
In this paper, an optimization technique for a mixed-discrete problem is discussed. The application of a genetic algorithm to find the solution of mixed-discrete problem is demonstrated. Genetic Algorithms(GA) are based on the principles of natural genetics and natural selection. As the algorithms have various design points including the characters of section area in the design field, GA have fatal weak points on processing and iteration time. In this study for the sake of overcoming these problems, section areas are not directly used but the standardized section areas are used. In this study the standardized section areas consist of the section area being used much. Furthermore, our results are compared and investigated by the existing optimization design result through the example.
金永錫 전북대학교 공업기술연구소 1978 工學硏究 Vol.8 No.-
The knowledge of the time-dependent behavior of rocks can be of rock engineering. Hence, it is considered essential that time-dependent properties of rocks be investigated in the laboratory. The facilities for studing time-dependent deformation were universal testing machine, strain gauge, bridge box, dynamic strain amplifier, lowpass filter and rapicorder. The main results are as follows. 1) The strain increase of chun-ho limestone specimens is proportional to the loading time. 2) The axial creep curve of Cheon-ho limestone specimens exhibite the three stages, In the first creep region strain increases, decreases again in the second and increases in the third till the specimen ruptures. 3) Stress-strain curves of Chang-seong and Hwasoon shales show that the strength of Chang-seong shale is higher than that of Hwa-soon and the strains are allmost same.
朴洪民 전북대학교 공업기술연구소 1975 工學硏究 Vol.4 No.-
In oredr to obtain sone data of the thermal rock fracture, the author measured the strength changes of racks heated to high emperature. In this paper the author described the experimental results about two kinds of such typical rocks as granite and limestone, the results are as follows; 1) The strength in instant cooling in water from hot conditions is less than that in gradual cooling in a furnace. 2) Fracturing mechanism of granite is transformation of crystal form of the constituting minerals of rock and that of limestone is decomposition of the constituting minerals.
김기주 전북대학교 공업기술연구소 1975 工學硏究 Vol.3 No.-
Studying on the corrosion of the Aluminium plates in the acidic baths, 5, 15, 30, 50 percents of H_2SO_4, HNO_3 and 5, 15, 30 percents of HCl were used for the corrosive solutions. The corrosion rates of the Aluminium plates in the acidic baths were calculated by the weight loss method and pH values of the corrosive acid solutions were measured by pH-meter. The results are as follows : 1. Under the same condition of acidities, the corrosion rates of the Aluminium plates are as follows : HCl<HNO_3>H_2SO_4 2. The corrosion rates of the Aluminium plates increase in proportion to the acidities of the corrosive acid solutions for weak acidities.
윤평란,이강문 전북대학교 공업기술연구소 1975 工學硏究 Vol.3 No.-
influences of sodium silicate and ferric salt on the flotation of calcite, scheelite and fluorite by sodium oleate in the Hallimond tube were examined. sodium silicates used are three kinds: the molar ratio of SiO_2 to Na_2O is 1:1, 2:1, and 3:1, respectively. The higher the molar ratio of sodium silicate, the stronger the depression of the minerals, indicating that the depressing action is due to colloidal cilica evolved from the sodium silicate. In the case of pre-treatment using sodium silicate followed by ferric salt, however, the higher the molar ratio of sodium silicate, the weaker the depressing action, showing that the entity of depre-ssing in this case is quite or somewhat different from the above-mentioned colloidal silica. Anyhow, calcite only is completely depressed by the pre-treatment using sodium silicate followed by ferric salt.