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池應業,崔相旭,柳泰源 亞州大學校 1978 論文集 Vol.2 No.-
Three kinds of specimen, consisting of the graded pyrophyllite particles alone, a substituent of 8 percent fireclay for the finer portion (F₂)of it, and 0.8 percent inorganic binder-added composite were prepared under the following conditions respectively; moisture content=4.5∼5.0%, forming pressure=250㎏/㎠ and sintering temperature=1,000∼1,300℃. The various properties such as modulus of rupture, apparent porosity, bulk specific gravity, pore size and pore distribution were measured in order to collaborate with sintering phenomena. The results obtained are as follows: (1) Apparent porosity is gradually decreased with rishing the sintering temperature to 1,250℃. (2) The binder-added specimen showed the lowest value in porosity. (3) The optimum sintering temperature of specimens was considered to be 1,250℃ (4) The wider differences between pore volumes of specimens could be obtained by method of mercury penetration porosimeter than by the conventional method for porosity.
Customer Analysis using Decision Tree and Association Rule Mining
Ryu, Tae-Wan,Le, Kevin,Han, Jin-chul,Yoon, Chung-hwa 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - Data mining becomes more and more important in business decision-making process. Recently, several data mining techniques have been successfully applied to analyze various data. Among those, decision tree induction and association rule mining are two of well-known data mining techniques. In this paper, we employ the decision tree induction and association rule mining to discover implicit, previously unknown, and potentially useful information from customer data for an e-commerce company. We present three common groups discovered that show similar buying tendency and several interesting association rules that describe the profiles, lifestyles, and preferences of customers. Although it is yet to be determined whether or not our analysis will provide the company a competitive business edge, we are sure that this analysis would help the company adjusts online marketing strategy.
Natural polymer-based electroconductive hydrogels via thiol-ene click reaction
최은정,류태원,송창식 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Thiol-ene reactions have been widely used because they have the characteristics of “click reactions”, which are fast and high-yielding without side reactions. The hydrothiolation reactions proceed either by a radical pathway or catalytic pathway. Although there are differences of reactivity and reaction mechanism, ene species (i.e. terminal alkene, norbornene) and thiol species have a wide range of substrate scope to proceed thiol-ene reaction. In this study, alkene-functionalized alginates were converted to hydrogels via UV-mediated thiol-ene reaction. For furnishing electroconductivity, the alginates were blended with conducting polymers. The synthesized hydrogels were characterized by rheology and electrochemical spectroscopy. We tested the electoconductivity of the hydrogels when divalent ions are bound to alginate, since the microstructure of the hydrogel can be changed upon binding of divalent ions.
지응업,최상욱,류태원 한국세라믹학회 1977 한국세라믹학회지 Vol.14 No.4
Three kinds of specimen, consisting of the graded pyrophyllite particles alone, a substituent of 8 percent fire clay for the finer portion ($F_2$) of it, and 0.8 percent inorganic binder-added composite were prepared under the following conditions respectively; moisture content=4.5~5.0%, forming pressure=250kg/$\textrm{cm}^2$ and sintering temperature=1, 000~1, 30$0^{\circ}C$. The various properties such as modulus of rupture, apparent porosity, bulk specific gravity, pore size and pore distributiion were measured in order to collaborate with sintering phenomena. The results obtained are as follows: (1) Apparent porosity isgradually decreased with rising the sintering temperature to 1, 25$0^{\circ}C$. (2) The binder-added specimen showed the lowest value in porosity. (3) The optimum sintering temperature of specimens was considered to be 1, 25$0^{\circ}C$. (4) The wider differences between pore volumes of specimens could be obtained by method of mercurypenetration porosimeter than by the conventional method for porosity.