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혼합물설계법에 의한 Li<sub>2</sub>O-TeO<sub>2</sub>-ZnO 유리의 물성에 대한 조성의 가성성인자 분석
정영준,이규호,김태호,김영석,나영훈,류봉기,Jung, Young-Joon,Lee, Kyu-Ho,Kim, Tae-Ho,Kim, Young-Seok,Na, Young-Hoon,Ryu, Bong-Ki 한국재료학회 2008 한국재료학회지 Vol.18 No.11
In this study, the additivity factors of compositions to density and glass transition point ($T_g$) in a $xLi_2O-(1-x)[(1-y)TeO_2-yZnO]$ (0<x<20, 0<y<20) glass system were analyzed by using mixture design, and the change of ionic conductivity with density and $T_g$ was discussed. As a method for predicting the relation between glass structure and ionic conductivity, density was measured by the Archimedes method. The glass transition point was analyzed to predict the relation between ionic conductivity and the bonding energy between alkali ions and non-bridge oxygen (NBO). The relation equations showing the additivity factor of each composition to the two properties are as follows: Density(g/$cm^3$) = $2.441x_1\;+\;5.559x_2\;+\;4.863x_3\;T_g(^{\circ}C)$ = $319x_1\;+\;247x_2\;+\;609x_3\;-\;1950x_1x_3$ ($x_1$ : fraction of $Li_2O$, $x_2$ : fraction of $TeO_2$, $x_3$ : fraction of ZnO) The density decreased as $Li_2O$ content increased. This was attributed to change of the $TeO_2$ structure. From this structural result, the electric conductivity of the glass samples was predicted following the ionic conduction mechanism. Finally, it is expected that electric conductivity will increase as the activation energy for ion movement decreases.
RSM 법에 의한Li<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> (LAS) 유리의 소결 거동과 결정화에 대한 연구
이규호,김영석,정영준,김태호,서진호,류봉기,Lee, Kyu-Ho,Kim, Young-Seok,Jung, Young-Joon,Kim, Tae-Ho,Seo, Jin-Ho,Ryu, Bong-Ki 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.8
This paper presents results and observations obtained from a study of sintering behavior and crystallization in $Li_2O-Al_2O_3-SiO_2$ (LAS) Glass by screen printing method. The variable experimental conditions were determined carefully by Thermal-Mechanical Analyzer (TMA), Differential Thermal Analyzer (DTA) for setting the optimum transparent sintering conditions in LAS glass system, $10.5Li_2O-14.7Al_2O_3-58.1SiO_2-16.7B_2O_3(wt%)$, such as glass-ceramics which usually have low crystallization temperatures. Crystallization glasses generated during sintering was observed from diffraction patterns by X-Ray Diffraction (XRD), transmittance by UV-Vis spectrometer. Finally, the optimum sintering condition of LAS glass and the relation between factors and results in several sintering conditions were given by using Response Surface Methodology (RSM). From this study, we confirmed that crystallization interrupted densification during glass powder sintering. Furthermore, we observed that main effect of factors in glass powder sintering with concurrent crystallization depended on experimental conditions from main effects plot by MINTAB-14.
김청섭(Chung-sup Kim),김준석(Jun-seok Kim),정영준(Young-jun Chong) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
이동통신 대역의 BW가 증가함에 따라 시간차를 이용한 TDOA 방식을 이용하여 신호원의 위치를 정밀하게 추정하는 것이 가능하다. 본 논문에서는 TDOA와 융합하여 위치 추정 성능을 높이는 방법을 연구하였고 다양한 융합형태의 알고리즘을 이용하여 성능분석을 한 결과를 제시하였다
이규호 ( Kyu Ho Lee ),김태호 ( Tae Ho Kim ),정영준 ( Young Seok Kim ),김영석 ( Young Joon Jung ),나영훈 ( Young Hoon Na ),류봉기 ( Bong Ki Ryu ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 ELECTRONIC MATERIALS LETTERS Vol.4 No.1
This paper presents results and observations obtained from a study of crystallization behavior in Li2O-Al2O3- SiO2 (LAS) glass powders. Variable kinetic parameters have been obtained in order to investigate the crystallization behavior by using non-isothermal differential thermal analysis. LAS glass powders including B2O3 which induce a low firing process have been melted and crushed to obtain coarse and fine glass powder. In case of coarse particles with 88 μm, the crystallization have been generated at 649~699°C, the crystallization of fine particles with 44 μm have been observed at 640~684°C according to heating rate. In order to obtain the activation energy of crystallization (EC) and Avramic constant (n), Kissinger and Ozawa equations have been used. The average activation energies of crystallization were [44 μm=48.09±1 kcal/ mol, 88 ?m = 53.02±1 kcal/mol] Avramic constant (n) were [44 μm=1.3, 88 ?m=1.6] in Li2O-Al2O3-SiO2 (LAS) glass. Finally, we have observed the surface and bulk crystallization of β-spodumene were occurred simultaneously in this glass powder by using SEM (Scanning Electron Microscopy) and XRD (X-ray diffraction).
이희춘(Hee-Choon Lee),김선옥(Sun-Ok Kim),이석준(Lee Seok-Jun),정영준(Chung Young-Jun) 한국정보과학회 강원지부 2007 한국정보과학회 강원지부 학술대회 논문집 Vol.1 No.1
본 연구는 추천시스템에서 협력적 필터링 알고리즘을 이용한 고객 선호도 예측 결과와 고객에게 적합한 상위 N개의 상품 리스트 추천 정확도간의 관계를 이용하여 고객에 대한 Top-N 추천의 사전 평가에 대해 연구하였다. 선호도 예측 알고리즘으로 생성된 선호도 예측의 정확도에 대한 연구는 많이 이루어져 있으나 선호도 예측치를 이용한 실제 상품 추천과의 관계에 대한 연구는 연구가 부족하다. 본 연구에서는 선호도 예측 알고리즘으로 생성된 선호도 예측치와 실제 선호도 평가치간의 순위와 Top-N 추천의 관계를 이용하여 고객에 대한 Top-N 추천의 사전 평가에 대하여 연구하였으며 이를 평가하기 위한 추천안정지수에 대하여 연구하였다.