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공통의 Glass를 이용한 LTCC 이종소재의 무수축 접한
장의경,신효순,여동훈,김종희,Jang, Ui-Kyeong,Shin, Hyo-Soon,Yeo, Dong-Hun,Kim, Jong-Hee 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12
To improve warpage, delamination and the chemical reaction between 2 different co-fired materials, the bonding behavior with common glass was studied. As shown in the previous paper, the phenomenon of the infiltration is different with the composition of the glass. In particular, in the case of low temperature melting glass, infiltration is experimented in this study. GA-1 glass is infiltrated among $BaTiO_3$ particles below $800^{\circ}C$ and is made by glass/ceramic composite. Until the laminate is fired under $850^{\circ}C$, provskite phase is observed. Although in the case of GA-12 glass, the temperature of the glass infiltration is lower than it of GA-l glass, the perovskite phase already disappears at $800^{\circ}C$. As a result, GA-1 and GA-12 glasses are infiltrated among particles at low temperature, however, the chemical reactivity of the glass/ceramic and sintering temperature should be considered.
무기소재 및 생물환경 소재로서의 규조류 활용 연구 동향
장의경(Eui Kyoung Jang),신현경(Hyun Kyeong Shin),백승필(Seung Pil Pack) 한국생물공학회 2014 KSBB Journal Vol.29 No.1
One of the most abundant microalgaes, diatom is characterized by its unique cell wall structures composed of nano-patterned silica. Due to its highly ordered porosity, these silica frustules, which are found as sediments called diatomite, were used as a cheap adsorption material for water purification. Recently, new emerging nanotechnology compels many researchers to have interest in such diatom’s unique properties (eg, nano-scale mesoporosity, photo luminescence, light transparency, etc.) as biogenic inorganic materials as well as the biomass resource (conventional usage of microalgae). In this review, we will focus on the current knowledge about the diatoms research and the possibility of its applications.
장권혁(Kwon Hyuk Jang),김의경(Eui Kyoung Kim),이상윤(Sang Yoon Lee),이용천(Yong Chen Lee),윤명상(Myoung Sang Yun) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅱ
정보화 서비스를 제공하기 위해서는 사실 기반의 데이터, 데이터의 전달을 위한 네트워크 기술, 그리고, 정보를 원하는 목적에 맞게 처리하여 원하는 사용자에게 전달하여 부가적인 가치를 부여하게 하는 응용 소프트웨어로 크게 나눌 수 있을 것이다. 이러한 응용 소프트웨어 중에는 기술적, 관리적, 문서적인 측면에서 체계적으로 관리되어 있지 않아, 그 상품성을 제대로 인정 받지 못해 진정한 가치를 평가 받고 있지 못하고 있는 실정이다. 따라서, 일반 응용 소프트웨어를 상품화하여 제대로 그 가치를 평가 받을 수 있도록 준비하는 과정을 제안하고자 한다.
병류 5회 평형추출에 의한 coal tar 유분 중에 함유된 indole의 회수
김수진,장의경,전용진 한국공업화학회 2004 응용화학 Vol.8 No.2
Recovery of nitrogen heterocyclic compounds (NHC) contained in coal tar oil fraction was investigated by cocurrent five stages equilibrium extraction. The aqueous solution of formamide was used as a solvent. NHC (particularly, indole) was recovered as much as 99% by cocurrent four stages equilibrium extraction. Maximum selectivity of indole based on 2-methylnaphthalene (2MN) obtained through cocurrent three stages equilibrium extraction was 54. The sequence of the distribution coefficient and selectivity based on 2MN for each component of NHC was indole>iso-quinoline≥quinoline>quinaldine. Extraction method using the aqueous solution of formamide as a solvent was estimated superior separation method in terms of the separation performances for NHC (particularly, indole) contained in coal tar. oil fraction.
백승필,민기하,장의경,여기백,기미란 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Carbonic anhydras (CA) is a potential biocatalyst for CO<sub>2</sub> sequestration because of its ability to catalyze the conversion of CO<sub>2</sub> to bicarbonate. High production and immobilization of functional CA are required for practical application of enzymatic CO<sub>2</sub> capture system. In previous report, α type-CA (HC-aCA) of Hahella chejuensis KCTC was mostly produced as insoluble form in E. coli expression system. Here, by removal of the signal peptide (sp), we successfully set up soluble expression systems. Under the optimized conditions, 30 mg/L of purified HC-aCA (sp-) was obtained. HC-aCASP(-) displayed high pH stability in alkali condition with maximal activity at pH 10. In addition, we chemically immobilized the HC-aCA(sp-) on silica particles. HC-aCASP(-) immobilized silica particle activity retained above 90% even after 10 times reuse.