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탄소강선의 강종별 고주파소입조직 (高周波燒入組織) 에 대한 연구
오응환,황룡길 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.4
The microstructures and austenite grain sizes of carbon steel wires treated by high frequency induction heating and quenching were studied. Effects of alloying elements Ti, B added to a carbon steel wire were also discussed. A lot of untransformed ferrites were found in the center of the specimen of low carbon steel: but the volume of those decreased as carbon content was increased under the same test heating temperatures. In regard to Ti and B of alloying elements, Ti showed a significant effect on depressing the austenite grain growth and B tended to increase hardenability.
炭素鋼線의 鋼種別 高周波誘導加熱에 따른 機械的 性質에 관한 硏究
吳應煥,黃龍吉 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-
This study has been carried out to investigate into the characteristic changes of mechanical properties of carbon steel wires with high frequency induction heat treatment. The results obtained from the experiments are as folows: 1.Yield Point(or yield ratio) was inceased with the increasing of carbon content and relaxation resistance above 0.3% C was improved remarkably. 2.The change of delayed fracture resistance scarcely showed anything by carbon content, but known effet of delayed fracture resistance wiht restraint effect of grain growth of Ti. 3.Spot weldability was dropped excessively above 0.4%C equivalent, but showed the most excellent in 0.28%C steel (AISI10B30) contained Ti.
오응환,황용길 東亞大學校 海洋資源硏究所 1988 硏究論文集 Vol.1 No.1
Investigation of the PC steel rods were performed by using the induction heat treatment at various conditions, corrosion test in 20%NH₄SCN aqueous solution. It was summarized as below; 1) The samples before heat treating were not well corrosed than the samples after heat treating, and the more increasing heat treatment temperature up to 960℃, the more increasing amount of corrosion, and PH value increased in the bulk both heat treated sample and original sample in aqueous solution from PH 4.6 to Ph 7.5 and decreased about PH 6.7 through passing time. 2) Produced oxides through corrosion were became mainly to FeOOH and ε-Fe₂O₃. 3) Fracture time velocity(B) sample involved T₁, B elements were quick over seven times. 4) Hardness of (B) sample involved T₁, B is over about H??450, (A) Sample is below about H??450. 5) When the delayed fracture were performed by FIP method, the reduction area were nearly occured. It is considered that the sample was broken by expanded pressure of H₂ gas in steel from Fe₃C cathode surface as the results equilibrium was broken, so that was produced.
安英敏,吳應煥,黃龍吉 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.1
This study has been carried out to investigated into corrosion of PC steel wires, heat-treated AISI1022 and AISI10B32 at set temperature by high frequency induction continuation heat-treatment, that was deposited in city water, seawater, 0.75% H₂SO₄ solution and NH₄SCN aqueous solution for the 20days.
환경에 대한 소비자의 관여와 경험이 구매정보 탐색에 미치는 영향에 관한 연구
황호종,오응환 용인대학교 산업경영연구소 2004 산업경영논총 Vol.11 No.-
Consumers look for the information related to goods and services before purchasing them. The information search activities are not limited to any specific part of decision making process of consumers but concerned with the whole process. Therefore, in order to perform a successful marketing activity, one needs to understand the information search process of consumers for purchasing goods and services. While the so-called environmental product or ecological product is perceived different from the non-environmental or non-ecological product, there is a lack of concern in finding differences between them in information search process . Especially, there are few studies to find out how the information gathering process is affected by the environmental consciousness of consumers such as environmental experience, and involvement. Therefore, the purpose of this study is to find out the relationship between consumers' ecological consciousness and the information search. To achieve these purposes, several hypotheses are proposed and tested. The findings are as follows: First, there is a positive relationship between the consumers' involvement and the amount of the information search. However, there are no differences on the non-personal sources of information between high-involvement groups and low-involvement groups. Secondly, there is also a positive relationship between consumers' experience and the amount of the information search. And, direct purchase experience has a positive relationship with personal and non-personal sources of information.