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Thermal Characteristics of a Laser Diode Integrated on a Silica-Terraced PLC Platform
김덕준,신장욱,성희경,Young-Tak Han,Yoon-Jung Park,Sang-Ho Park 한국전자통신연구원 2005 ETRI Journal Vol.27 No.3
A spot-size converted Fabry-Perot laser diode (LD) was flip-chip bonded to a silica-terraced planar lightwave circuit (PLC) platform to examine the effect of the silica terrace on the heat dissipation of the LD module. From the measurement of the light-current characteristics, it was discovered that the silica terrace itself is not a strong thermal barrier, but the encapsulation of the integrated LD with an index-matching polymer resin more or less deteriorates the heat dissipation.
김덕준 평화문제연구소 2005 統一問題硏究 Vol.44 No.2
This study illuminates subjective perceptional differences on unification education by applying Q-methodology. The analytical focus centers on the characteristics/differences/implications of diverse perception structure held by the 33 college students. The paper constructs a Q-sample with 32 Q-statements by the subjects. By utilizing the "PQMethods 2.09" program, we classify five categories of perceptional characteristics on unification education. These results clearly indicate that diverse and/or opposing policy preferences are mingled in the subjective perception on unification education. Thus, we need to create open and effective communication channels among the participants of the policy process. In addition, a mechanism that can ensure fair and accurate political bargaining and compromise among policy stakeholders should be constructed.
$Zr(SO_4)_2$ 수용액을 이용한 SiC 휘스커의 지르코니아 코팅
김덕준,김환,Kim, Duk-Jun,Kim, Hwan 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.12
The effects of urea addition and reaction conditions were examined in the prepareation of zirconia coated SiC whiskers through surface precipitation taking place during high-temperature aging of Zr(SO4)2 solutions containing the whiskers. More dense zirconia-hydrate was precipitated on the surfaces of the whiskers in the presence of urea. The ratio of the concentration of Zr(SO4)2 to the amount of added whiskers was the most important factor to confine the precipitation of zirconia-hydrate only at the surfaces of the whiskers The from of the coating layers was unchanged after heat-treatment leading to the dehydration and crystallization of the layers.
수소이온 흡착밀도의 고찰을 통한 고농도 알루미나 현탁액의 제조
김덕준,김환,Kim, Duk-Jun,Kim, Hwan 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.2
Measurements of proton adsorption density have been conducted in preparing alumina suspensions with aqueous solutions of HCL, HNO3, H2SO4 and H3PO4 And effects of anion acid concentration proton adsorption density and solid loading on the viscosity of the alumina suspensions have been investigated. Aqueous solutions of HCl. or HNO3 were suitable for the preparation of highly concentrated suspensions as the generation of surface charge on alumina particles was depressed by the specific adsorption of {{{{ {SO }`_{4 } ^{2- } }} and {{{{ { PO}`_{4 } ^{3- } }} Optimum conditions for maximizing solid loading were dependent upon proton adsorption density and acid concentration.