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김형진,황성욱,강동호,정빛남,심진기 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Two kinds of carbon based nanofillers, carbon black (CB) and acetylene black (AB), a special subtype of carbon black, were each studied as a secondary nanofiller in polypropylene (PP) composite that contains single-walled carbon nanotube (CNT) as a primary nanofiller to explore the effect on electrical property. CB clusters and fibrous CNTs each can improve electrical conductivities of composites by forming conductive networks over short distances and long distances, respectively. Moreover, CB clusters and CNTs together have synergistic effect on the conductivity as CB clusters link the fibrous CNTs over small distances. Different compositions of CNT/CB pair and CNT/AB pair with a fixed total filler concentration of 1.4wt% were prepared by melt compounding/ extrusion process with controlled residence time of 20mins. The effects of CB and AB as a secondary nanofiller were evaluated in terms of electrical conductivity, mechanical, rheological and morphological properties.
2LB-7 Analysis of surface roughness of paper by direct contact method using metal probes
김형진,정현석,이형규,고영찬 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The most commonly used methods on smoothness and roughness of paper and board materials are three types of air leakage method; Bendtsen roughtness, Bekk smoothness and Parker print-surf roughness. Bendtsen roughness is achieved by indirect method measuring the rate of airflow in ml/minute between the paper and head. Bekk smoothness is measured by the air leak method but, air is drawn across the surface of the test piece under a partial vacuum. Parker print-surf roughness is designed specifically for measuring the surface roughness of printing papers. In this study, the direct contact method using the different types of metal stylus tips was considered as a new analytical method for measuring the rough surfaces of paper and board.
정재준(Jae Jun Jung),황원주(Won Ju Hwang),김형진(Hyuong Jin Kim),이태희(Tae Hee Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Metamodels such as response surface model (RSM) and kriging model are used to meet weight minimization of a double-deck train car-body. Weight minimization problem of the double-deck train car-body is required to decide 36 design variables of thicknesses for large aluminum extruded panel while satisfying stress constraints. Therefore, we attempt to reduce the number of design variables by using RSM as a screening process based on orthogonal array design. Global sensitivity and Pareto plot of responses with respect to design variables are employed as screening criterion. After screening design variables, maximum entropy sampling is employed to select additional sample points. We construct kriging model for the mass and maximum stress of a double-deck train car-body with the reduced design variables. Optimization based on kriging model is performed and the merits of this design methodology are discussed.