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일축배향 기공채널과 향상된 압축강도를 갖는 다공질 알루미나/뮬라이트 층상 복합체
김규헌,김태림,김동현,윤석영,박홍채,Kim, Kyu Heon,Kim, Tae Rim,Kim, Dong Hyun,Yoon, Seog Young,Park, Hong Chae 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.1
Three-layer porous alumina-mullite composites with a symmetric gradient porosity are prepared using a controlled freeze/gel-casting method. In this work, tertiary-butyl alcohol (TBA) and coal fly ash with an appropriate addition of $Al_2O_3$ were used as the freezing vehicle and the starting material, respectively. When sintered at $1300-1500^{\circ}C$, unidirectional macro-pore channels aligned regularly along the growth direction of solid TBA were developed. Simultaneously, the pore channels were surrounded by less porous structured walls. A high degree of solid loading resulted in low porosity and a small pore size, leading to higher compressive strength. The sintered porous layered composite exhibited improved compressive strength with a slight decrease in its porosity. After sintering at $1500^{\circ}C$, the layered composite consisting of outer layers with a 50 wt% solid loading showed the highest compressive strength ($90.8{\pm}3.7MPa$) with porosity of approximately 26.4%.
동결주조 다공질 뮬라이트 세라믹스의 제조와 석탄회의 재활용
김규헌,윤석영,박홍채,Kim, Kyu Heon,Yoon, Seog Young,Park, Hong Chae 한국재료학회 2016 한국재료학회지 Vol.26 No.2
In order to fabricate porous mullite ceramics with controlled pore structure and improved mechanical strength, a freeze casting route has been processed using camphene mixed with tertiary-butyl alcohol (TBA) and coal fly ash/alumina as the solvent and the ceramic material, respectively. After sintering, the solidification characteristics of camphene and TBA solvent were evident in the pore morphology, i.e., dendritic and straight pore channels formed along the solidification directions of camphene and TBA ice, respectively, after sublimation. Also, the presence of microcracks was observed in the bodies sintered at $1500^{\circ}C$, mainly due to the difference in solidification volume change between camphene and TBA. The compressive strength of the sintered bodies was found generally to be dependent, in an inverse manner, on the porosity, which was mainly determined by the processing conditions. After sintering at $1300{\sim}1500^{\circ}C$ with 30~50 wt% solid loading, the resulting mullite ceramics showed porosity and compressive strength values in ranges of 83.8~43.1% and 3.7~206.8 MPa, respectively.
GPS를 이용한 실시간 사용자 커뮤니티 서비스 설계 및 구현
김규헌(Gue-heon Kim),김현필(Hyun-pil Kim),김환(Hwan Kim),권영미(Youngmi Kwon) 한국멀티미디어학회 2009 한국멀티미디어학회 학술발표논문집 Vol.2009 No.1
본 연구에서는 위치인식 기술의 대표적인 기술 중 하나인 GPS를 이용하여 유비쿼터스 서비스를 제공해 주는 사용자 참여 서비스 시스템을 구현하였다. 사용자 참여 서비스 시스템은 인터넷 연결이 가능한 단말기를 통해 현재 위치의 정보를 한눈에 파악하여 주변의 정보획득 및 사용자 참여를 통한 실시간 정보공유를 할 수 있도록 해준다. GPS를 이용한 실시간 사용자 참여 서비스를 위해서 하드웨어 GPS와 범용적으로 사용이 가능한 단말과의 인터페이스를 위해 Bluetooth와의 통신, 그리고 웹서버 응용프로그램을 개발하였다. 제안하는 시스템은 일정주기로 현재위치공간의 상태를 사용자의 단말에 업데이트 할 뿐 아니라, 사용자가 원할 때 웹서버 응용프로그램을 통하여 현재의 상황을 실시간으로 확인 할 수 있는 양방향 인터페이스를 제공한다. 수집된 공간 정보는 일정기간 데이터베이스에 저장함으로써, 시간 혹은 공간별 사용자의 취미, 기억에 대한 메모 등의 관심사를 단말기를 통해 수시로 설정 및 변경한 정보를 공유할 수 있도록 구현하였다. 본 연구에서 개발한 시스템은 학교 내의 지리정보를 입력하였으며, 단말기를 통하여 서비스를 제공함으로써 실용성을 확인하였다.
식물성 식품원료의 진위 판별을 위한 종 특이 프라이머의 개발
김규헌 ( Kyu Heon Kim ),김용상 ( Yong Sang Kim ),김미라 ( Mi Ra Kim ),이호연 ( Ho Yeon Lee ),정유경 ( Yoo Kyung Jung ),이재황 ( Jae Hwang Lee ),장혜숙 ( Hye Sook Chang ),박용춘 ( Yong Chjun Park ),김상엽 ( Sang Yub Kim ),최장덕 ( 한국산업식품공학회 2014 산업 식품공학 Vol.18 No.4
In this study, a detection method was developed and optimized using a molecular biological technique to distinguish 21 vegetable food raw materials. The genes for the distinction of species in the raw materials were targeted at Internal Transcribed Spacer (ITS) in nucleus and the Maturase K (matK) gene in chloroplasts. The species-specific primers were designed for PCR products around 200 bp for their application to processed products. The amplicon size for the following: Winter mushrooms, Shiitakes, Button mushrooms, Lacquer tops, King oyster mushrooms, Oyster mushrooms, Chestnuts, Pine nuts, Walnuts, Aloe, Water dropwort, Scallions, Chinese chives, Cucumbers, Horseradish, Mustard, Mung beans, Red beans, Guarana, Korean dandelions, and Dandelions were confirmed at 166 bp ~ 245 bp, respectively. Non-specific PCR products were not detected in similar species by the species-specific primers. The detection method of raw materials developed in this study would be applied to food safety management for the eradication of adulterated food distribution and protection of consumers’ rights.
다중 수신국 실시간 위성항법데이터 처리 성능향상을 위한 데이터 송,수신 설계
김규헌 ( Gue Heon Kim ),손민혁 ( Min Hyuk Son ),이은성 ( Eun Sung Lee ),허문범 ( Moon Beom Heo ) 한국항공운항학회 2012 한국항공운항학회지 Vol.20 No.4
This paper propose a transmission method for “Transportation system” that can decide precise position under wide area road traffic environment. For precise position detecting,central station collect multiple receiver station`s satellite navigation data and generate correction information. In this process, we need efficient real time transmission method for satellite navigation message that has variable data size. We propose real time data transmission method. This real time transmission method offer efficient processing structure for multiple receiver station`s satellite navigation message. This paper explains proposed real time transmission method and proofs this transmission method.