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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.
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.
김형진(Hyung-Jin Kim),윤희상(Hee-Sang Yun),정백호(Baek-Ho Jung) 호서대학교 공업기술연구소 2004 공업기술연구 논문집 Vol.23 No.1
In this paper, a new form ulation is presented for analyzing the transient electrom agnetic response from conducting w ire antennas using the tim e-dom ain integral equation (T D -IE ). Instead of the conventional m arching-on in tim e (M O T ) technique, the solution m ethod is based on the G alerk ins m ethod th at involves separate spatial and tem poral testing procedures. Piecew ise triangle basis functions have been used for spatial expansion and testing functions for arbitrarily shaped w ire structures. T he tim e-dom ain variation is approxim ated by a set of orthonorm al basis functions th at is derived from the Laguerre polynom ials. These basis functions are also used for tem poral testing. The m ethod presented in this paper results in very stable transient responses from w ire antennas. Representative num erical results are presented and com pared w ith the inverse discrete Fourier transform (ID F T ) of the frequency dom ain solution.