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Cu-C-Fe₃O₄-Sn 소결 마찰재의 첨가물이 미세구조와 마찰특성에 미치는 영향
최석의(Seok Eui CHOI),함효균(Hyo Kyun HAM),오용택(Yong Taeg OH),최희범(Hee Bum CHOI),김향래(Hang Rae KIM),최형기(Hyung Gi CHOI),이현규(Hyun Kyu LEE),신동찬(Dong Chan SHIN) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
The effects of zircon silicate (ZrSiO₄), Zinc oxide (ZrO₂), and Alumina (Al₂O₃), silicon carbide (SiC) as additives on the microstructure and tribological properties of sintered Cu-C-Fe₃O₄-Sn for racing car application have been studied. All the specimens were sintered at 750℃ for 30 min. The abrasive characteristics was tested on a 1/5 scale dynamometer. Effectiveness, fade & recovery, and noise tests were carried out to analyze the friction characteristics. The sintered specimens showed better abrasive properties in the order of ZrSiO₄ < ZrO₂ < Al₂O₃ < SiC. In the best additive of SiC, the friction coefficient was found to be 0.482 and showed less than 10% degradation during life time test at 100 Ian and 130 ㎞.
Cu-Sn 소결 마찰재에 C와 Cu 함량이 마찰특성에 미치는 영향
함효균(Hyo Kyun HAM),최석의(Seok Eui CHOI),오용택(Yong Taeg OH),최희범(Hee Bum CHOI),김향래(Hang Rae KIM),최형기(Hyung Gi CHOI),이현규(Hyun Kyu LEE),신동찬(Dong Chan SHIN) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
We have investigated the effects of graphite and cupper contents on the tribological properties of Cu-Sn sintered friction materials. The base materials used was Cu-Sn alloy. We varied graphite contents from 20 to 30 vol% with an interval of 5% and Cu contents of 25 and 35 vol%. All the specimens were sintered for 30 min at 750℃, nitrogen atmosphere by hot press method. Their friction and abrasive characteristics was evaluated by 1/5 Scale dynamometer. When the Cu content is decreased, we can get higher friction coefficient and less abrasion. The lowest abrasion was obtained at the condition of 30 vol% graphite. The highest friction coefficient was obtained in the specimen of 20 vol% graphite.
최형기 대한언어학회 2000 언어학 Vol.8 No.3
Choi, Hyung - Ki. 2000. On the Complement of Korean. Journal of the Linguistic Association of Korea 8(3), 203-217. Complements of Korean sentencial components have many different views. A complement is required for Semantical supplement when a verb also does not bring the meaning to a conclusion. Therefore, the complement demanded is caused by semantical features of verbs. My proposal in this paper are as follows. (1) Following subject in double subject sentence, is a complement, only it composes of eccentricity structure. (2) Sentencial components composed of a in complete transitive verb are complement, too. Because they have a function as essential component of sentence. (3) A adverbial word is complement, as well. (원광대학교)
최형기 대한언어학회 1995 언어학 Vol.3 No.-
Choi, Hyung-gi(1995). A Study on the basic sentence pattern of Korean ( II) - focus on the reproduction of a sentence element -. Linguisics vol. 3. The purpose of this paper is (1) to inquiry into enlarged structure by the reproduction of same sentence elements in classification of sentence pattern based on predicate. (2) to investigate that those are not new sentence patterns deviated from the basic sentence pattern. Ultimately, in analyzing the sentence pattern, a essential standpoint is the how that sentence elements connected with each other. Therefore, enlarged sentence structure which is the reproduction of the same sentence element, is not a new sentence pattern. That is to say, it is nothing but basic pattern in the whole sentence. In this paper, I analyzed the reproductive phenomenon of a subject, predicate, complement, determiner and adverbial. The conclusion I get is that basic sentence patterns of Korean are classified; basic sentence : subject + predicate, primary sentence : subject + object + predicate, subject + complement + predicate, secondary sentence : determiner + subject +predicate, subject + adverbial + predicate.