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고로슬래그 골재를 사용한 다공성 콘크리트의 물리·역학적 특성에 미치는 고로슬래그 미분말, 황토 및 보강섬유의 효과
이진형,박찬기,Lee, Jin-Hyung,Park, Chan-Gi 한국농공학회 2010 한국농공학회논문집 Vol.52 No.5
The effects of blast furnace slag, hwang-toh, and reinforcing fiber on the physical and mechanical properties of porous concrete using blast furnace slag coarse aggregates have been evaluated in this study. The effect of the depending on replacement ratio of blast furnace slag to cement was investigated such that the replacement ratio was varied to 0 %, 25 % and 50 %. Also, the replacement ratios of hwang-toh were 0, 20 and 30 %. The polyvinyl alcohol fiber was used for the reinforcing fiber. A series of pH, unit mass, and void ratio tests have been performed to study the physical properties of the porous concrete using blast furnace slag coarse aggregates with the polyvinyl alcohol fiber and the replacement ratios of blast furnace slag, hwang-toh, while a series of compressive tests have been performed to evaluate the strength property depending on polyvinyl alcohol fiber and the replacement ratios of blast furnace slag, hwang-toh. The test results indicated that the physical and mechanical properties of porous concrete using blast furnace slag coarse aggregates is affected by the replacement ratio of blast furnace slag, and the fiber contents. According to the tests with polyvinyl alcohol fiber contents, the void ratio was decreased and the compressive strength was upgraded.
이진형,최순옥,박우현,Lee, Jin-Hyung,Choi, Soon-Ok,Park, Woo-Hyun 대한소아외과학회 2006 소아외과 Vol.12 No.2
Abdominal cystic lymphangiomas arising from the mesentery, omentum and retroperitoneum are rare and occasionally confused with other cause of acute abdomen. Sixteen children who underwent surgery for abdominal cystic lymphangioma between 1984 and 2005 at the Division of Pediatric Surgery, Keimyung University Dongsan Medical Center were evaluated retrospectively. There were 9 boys and 7 girls. Age ranged from 12 days to 13 years (mean age: 4.7years). The cysts were located in the omentum (4 cases),mesentery (9 cases: jejunum: 3, colon: 6). retroperitoneum (2 cases) and pelvic cavity (one case). The cyst content was hemorrhagic (8 cases), serous (5 cases), and inflammatory (2 cases), and chyle (one). Prenatal diagnosis was made in 3. The clinical features were variable, but abdominal pain, mass, and abdominal distention in order. There were 3 emergency operations in patients with complicated cyst, who were suspected of having panperitonitis and volvulus preoperatively. Complete excision was accomplished in all cases. There was one mortalityin a newborn with E.coli sepsis. Intestinal obstruction developed in 2 cases in long-term follow-up. No recurrence was observed. Although intraabdominal lymphangioma arising from mesentery, omentum and retroperitoneum are rare, it should be considered as a possible cause of acute abdomen.
나노 Imprinting을 위한 몰드 제작에 관한 연구
이진형(Jin-Hyung Lee),임현우(Hyun-Uoo Lim),김태곤(Taegon Kim),이승섭(Seung-Seoup Lee),박진구(Jin-Goo Park),이은규(Eun-Eyu Lee),김양선(Yang-Sun Kim),한창수(Chang-Su Han) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This study aims to investigate the fabrication process of nano silicon mold using electron beam lithography (EBL) to generate the nanometer level patterns by nano-imprinting technology. The nano-patterned mold including 100nm pattern size has been fabricated by EBL with different doses ranged from 22 to 38 μC/cm² on silicon using the conventional polymethymenthacrylate (PMMA) resist. The silicon mold is fabricated with various pattems such as circles, rectangles, crosses, oblique lines and mixed forms. The effect of dosage on pattern density in EBL is discussed based on SEM(Scanning Electron Microscopy) analysis of fabricated molds. The mold surface is modified by hydrophobic fluorocarbon (FC) thin films to avoid the stiction during nano-imprinting process.
무수말레인산이 그라프트된 폴리프로필렌 분말 첨가에 따른 시멘트 모르타르와 무극성 마크로 합성섬유의 부착 특성
이진형(Lee Jin-Hyung),박찬기(Park Chan-Gi) 대한토목학회 2011 대한토목학회논문집 A Vol.31 No.2A
본 연구는 섬유보강 시멘트 모르타르에서 무수말레인산이 그라프트된 폴리프로필렌(maleic anhydride grafted polypropylene, mPP) 분말의 첨가가 무극성 마크로 합성섬유(마크로 합성섬유)의 부착특성에 미치는 효과를 평가하였다. 다양한 mPP의 첨가율(시멘트 중량의 0%, 5%, 10%, 15%, 20%, 25%, 30%)에 따른 시멘트 모르타르와 마크로 합성섬유의 부착거동을 평가하기 위하여 Dog-bone 부착시험을 수행하였다. 시멘트 모르타르내에서 마크로 합성섬유의 부착 특성(일반거동, 인발하중 및 계면인성)은 mPP의 사용량 증가할수록 증가하였다. 인발시험 후 마크로 합성섬유 표면의 미세구조 분석은 mPP의 첨가율에 따른 마찰 저항력을 평가하기 위하여 관찰하였다. mPP의 첨가율이 증가할수록 마크로 합성섬유 표면에 긁힘 현상이 증가하였다. This study evaluated the effects of maleic anhydride grafted polypropylene powder (mPP) contents on the bond properties of cement mortar and nonpolar macro synthetic fibers (macro synthetic fiber). Dog-bone bond tests were performed to evaluate the bond performance of macro synthetic fiber in cement mortar with varying amounts of mPP (0%, 5%, 10%, 15%, 20%, 25%, 30% of cement weight). The bond properties (pullout behavior, pullout load and interface toughness) of macro synthetic fiber in cement mortar increased as the mPP contents was increased. The bond properties increased with the mPP contents. The microstructure of macro synthetic fiber surface was examined after the pullout test to analyze the frictional resistant force according to mPP contents during the pullout process of macro synthetic fiber in cement mortar. The scratched of macro synthetic fiber increased with the mPP contents.
라이프 로그 공유 및 관리를 위한 확률모델 기반 사용자 인터페이스 및 블로그 개발
이진형(Jin-Hyung Lee),노현용(Hyun-Yong Noh),오세원(Se-Won Oh),황금성(Keum-Sung Hwang),조성배(Sung-Bae Cho) 한국정보과학회 2009 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.5
모바일 장치에서 수집되는 로그 데이터는 개인의 일상에 대한 다양하고 지속적인 정보를 담고 있다. 이로부터 얻을 수 있는 사용자의 위치, 사진, 사용중인 모바일 장치 기능 및 서비스의 종류를 통하여 사용자의 상태를 추론하고 개인의 일상을 이해하는 연구가 많은 관심을 받고 있다. 본 논문에서는 모바일 장치로부터 실시간으로 로그 데이터를 수집, 분석하고 이를 지도기반으로 시각화하여 개인 일상에 대한 정보를 효과적으로 관리할 수 있도록 하며 다른 사용자와 이 정보를 공유하여 상호 사용 가능한 어플리케이션을 개발한다. 제안하는 어플리케이션은 베이지안 네트워크 확률 모델을 채택하여 개인의 상황을 추론한다. 실험에서는 실제로 수집된 로그 정보를 바탕으로 효율적 시각화 및 다른 사용자와의 정보 공유 기능의 유용성을 확인하였다. The log data collected on a mobile device contain diverse and continuous information about the user. From the log data, the location, pictures, running functions and services of the user can be obtained. It has interested in the research inferring the contexts and understanding the everyday-life of mobile users. In this paper, we have studied the methods for real-time collection of log data from mobile devices, analysis of the data, map based visualization and effective management of the personal everyday-life information. We have developed an application for sharing the contexts. The proposed application infers the personal contexts with Bayesian network probabilistic model. In the experiments, we confirm that the usability of visualization and information sharing functions based on the real world log data.