폐 패각과 정유 폐촉매를 사용한 Tricalcium Aluminate 클링커의 합성에 관한 연구

이건호,송태웅,Lee, Keon-Ho,Song, Tae-Woong 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.12

[ $3CaO{\cdot}Al_{2}O_3$ ] 클링커 제조 원료로서의 굴 패각과 정유 폐 촉매의 사용 가능성과 이들 조합물의 클링커 소성성 및 광물 생성거동을 광물상과 미구조 관찰을 중심으로 확인하였다. 굴 패각에 함유된 불순물은 클링커의 합성에 영향을 미치지 않았고 이들 조합물은 비교적 저온에서 $12CaO{\cdot}7Al_{2}O_3$를 생성한 후 다시 CaO와의 반응으로 $3CaO{\cdot}Al_{2}O_3$를 생성하므로 $1400^{\circ}C$에서의 1회 소성으로 클링커 합성이 가능하였다. 그 이상의 온도에서는 분해용융이 진행되었으며 동일한 소성 조건에서 알루미나원으로 수산화알루미늄을 사용할 경우에는 $3CaO{\cdot}Al_{2}O_3$의 생성이 완료되기 전에 용융되어 클링커의 합성이 불가능하였다. The clinkerbility and the behaviour of formation of $3CaO{\cdot}Al_{2}O_3$ were studied using the mixture of waste oyster shell and spent oil-refining catalyst mainly by the mineral and microstructural observation. By virtue of the formation of $12CaO{\cdot}7Al_{2}O_3$ at relatively low temperature and its successive reaction with CaO, the $3CaO{\cdot}Al_{2}O_3$ clinkers were formed easily without affection of minor constituents contained in oyster shell. Thus clinkers were formed at $1400^{\circ}C$ directly but began to melt incongruently at higher temperature above that. Aluminium hydroxide, however, was not desirable as an aluminous raw materials of the clinker because rapid melting occurs before $3CaO{\cdot}Al_{2}O_3$ forms main clinker mineral.

R-134a를 사용한 자동차용 스크롤 압축기의 스크롤 형상변화가 성능에 미치는 영향

이건호,김학수,조금남,유정열,Lee, Geonho,Kim, Haksoo,Cho, Keumnam,Yoo, Jungyul 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.11

The present study investigated the effects of geometric parameters considered on the performance of an automotive scroll compressor by assuming ideal, semi-real and real gases for R-134a. The geometric parameters were center thickness of scroll, height of scroll and the size of discharge port. Fourth-order Runge-Kutta method was applied to solve the thermodynamic equations, leaking rate equation and the equation of motion of discharge valve for ideal, semi-real, and real gases. The volumetric and adiabatic efficiencies for semi-real and real gases differed little, but those for ideal gas differed by 18% and 25% compared with those for real gas at 2,000rpm. The volumetric efficiency changed little as the design angle of scroll (${\gamma}$) changed, but the adiabatic efficiency at ${\gamma}$ of $34^{\circ}$ was higher by 2.4% than that of $147^{\circ}$ for 2,000rpm. The volumetric and adiabatic efficiencies at scroll height of 29.8mm were higher by 1.7% and 2.8% than those of 65.8mm. The volumetric efficiency changed little as the size of discharge port changed, but the adiabatic efficiency increased a little as the size of discharge port decreased.

실리콘 웨이퍼 세정을 위한 오존의 거동에 관한 연구

이건호,김인정,배소익,Lee Gun-Ho,Kim In-Jung,Bae So-Ik 한국반도체디스플레이기술학회 2005 반도체디스플레이기술학회지 Vol.4 No.4

The behavior of ozone in $NH_4OH$ was investigated to evaluate the solution as a cleaning chemical of the silicon wafer. The solubility of ozone in DI(Deionized) water increased as the oxygen flow-rate decreased and ozone generator power increased. Ozone in DI water showed solubility of 100 ppm or higher at room temperature. Ozone concentration was stabilized at the range of ${\pm}2ppm$ by controlling oxygen flow rate and ozone generator power. On the contrary, the solubility of ozone in $NH_4OH$ was very low and strongly depended on the concentration of $NH_4OH$ and pH. The redox potential of ozone was saturated within 10 minutes in DI water and decreased rapidly with the addition of $NH_4OH$. The behavior of ozone in $NH_4OH$ is well explained by redox potential calculation.

사이버나이프 6-D Skull Tracking의 유용성 평가

이건호,배선명,송흥권,백금문,Lee, Geon Ho,Bae, Sun Myeong,Song, Heung Kwon,Baek, Geum Mun 대한방사선치료학회 2018 대한방사선치료학회지 Vol.30 No.1

목 적 : 사이버나이프(Accuray Inc., Sunnyvale, CA)를 이용한 제1, 2경추의 정위체부방사선치료(Stereotactic Body Radiation Therapy, SBRT)시 사용가능한 Xsight Spine Tracking(XST)과 6-Dimensional Skull Tracking(6DST)의 비교를 통해 6DST의 유용성을 평가하고자 한다. 대상 및 방법 : 2017년 1월부터 9월까지 본원에서 사이버나이프를 이용하여 제1, 2경추에 SBRT를 진행한 환자 9명을 대상으로, 전산화단층촬영장치(Lightspeed VCT 64, General Electric Co. Waukesha, WI, USA)를 이용해서 컴퓨터 단층 영상(Computed tomography) 을 획득한 후 전산화치료계획시스템(Multiplan system Version 4.6, Accuray, US)를 이용해 제 1, 2경추에 대한 XST와 6DST가 가능한 계획을 수립하였다. 1차 영상 유도를 통해 환자 자세를 보정한 후 동일 환자에 대한 XST와 6DST를 순서대로 진행하고 측정된 결과값을 비교 평가하였다. 결 과 : 제1경추를 대상으로 XST을 실시한 후 측정된 6D Couch 의 Y, Z, X 축 값과 Roll, Pitch, Yaw 값 중 최대값은 0.9 mm, 0.9 mm, 0.7 mm과 $1.0^{\circ}$, $1.0^{\circ}$, $1.2^{\circ}$로 측정되었고, 6DST의 경우 0.7 mm, 0.7 mm, 0.9 mm과 $0.5^{\circ}$, $0.9^{\circ}$, $0.8^{\circ}$로 측정되었다. 제2경추의 XST를 실시했을 때 측정된 값 중 최대값은 0.7 mm, 0.7 mm, 0.8 mm과 $0.9^{\circ}$, $1.0^{\circ}$, $1.8^{\circ}$였고, 6DST의 경우 0.9 mm, 0.7 mm, 0.9 mm와 $0.9^{\circ}$, $0.9^{\circ}$, $1.0^{\circ}$로 측정되었다. 결 론 : 이번 연구를 통해서 제 1, 2 경추에 대한 XST와 6DST의 6D Couch 측정값이 모두 본원에서 기준으로 하고 있는 범위 안에서 측정되고 있음을 확인할 수 있었다. 또한 두 방법을 진행하는 과정에서 설정값 변경을 진행해야하는 XST보다 6DST가 영상유도절차를 간소화 시킬 수 있다는 것을 확인할 수 있었다. 따라서 제 1, 2 경추에 대한 SBRT를 진행할 경우 XST와 더불어서 6DST를 사용한다면 정확한 치료와 더불어서 치료 시간을 단축시킬 수 있을 것으로 사료된다. Purpose : The purpose of this study is to evaluate the usefulness of 6 Dimensional Skull Tracking(6DST) in Cyberknife Stereotactic Body Radiation Therapy(SBRT) for the first and second cervical vertebrae(C1 and C2) metastasis. Methode and material : The Computed Tomography (Lightspeed VCT 64, General Electric Co. Waukesha, WI, USA) was used to acquire the CT images of the 9 patients with cervical vertebrae(C1 and C2) metastasis. Treatment plans for Xsight spine tracking and 6 Dimensional skull tracking were established with planning system (Multiplan system Version 4.6, Accuray, US). The results of XST and 6DST for each patient were analyzed with Microsoft Excel 2010. Result : The Maximum offsets of XST for C1 were 0.9 mm in Y(supero-inferior), 0.9 mm in Z(antero-posterior), 0.7 mm in X(left-right) direction, and rotations were and 1.0 degrees roll, 1.0 degrees pitch and 1.2 degrees yaw. The Maximum offsets of 6DST for C1 were 0.7 mm, 0.7 mm, 0.9 mm and $1.0^{\circ}$, $1.0^{\circ}$, $1.2^{\circ}$ for Y, Z, X and Roll, Pitch, Yaw. The Maximum offsets of XST and 6DST for C2 were 0.7 mm, 0.7 mm, 0.8 mm and $0.9^{\circ}$, $1.0^{\circ}$, $1.8^{\circ}$, and 0.9 mm, 0.7 mm, 0.9 mm and $0.9^{\circ}$, $0.9^{\circ}$, $1.0^{\circ}$ for Y, Z, X and Roll, Pitch, Yaw, respectively. Conclusion : XST and 6DST showed identical results for translations and rotations within the tolerance. It is possible to simplify the treatment time and procedure by using the 6DST. Therefore, 6DST is very useful methode with XST among the various tracking methods in Cyberknife for the patients with C1, C2 vertebral metastasis.

냉난방기 에너지소비 저감을 위한 이중외피시스템의 이해

이건호,Lee, Geon-Ho 대한설비공학회 2006 설비저널 Vol.35 No.11

혀 기저부의 골성 분리종 2예

이건호,원호륜,구본석,장재원,Lee, Geonho,Won, Ho-Ryun,Koo, Bon-Seok,Chang, Jae Won 대한두경부종양학회 2019 대한두경부 종양학회지 Vol.35 No.1

Osseous choristoma is a rare, benign proliferative osseous lesion, which is defined as the growth of normal tissue in an abnormal location. The etiopathogenesis for its formation is unknown, but various hypotheses have been proposed. Treatment of choice is en-bloc resection, and no recurrence has been reported. Here, we report the two cases of osseous choristoma, presented with a mass on the base of the tongue with/without globus symptom and were treated with surgical excision.

작곡과의 성격과 문제점들

이건호,Lee, Geon-Ho 한국대학교육협의회 1987 大學敎育 Vol.25 No.-

공항산업 동향분석을 위한 텍스트 애널리틱스 모델에 관한 연구

남승주(Seungju Nam),최솔샘(Solsaem Choi),김준환(Junhwan Kim),김진기(Jin Ki Kim) 한국경영과학회 2020 經營 科學 Vol.37 No.1

Analyzing current trends and identifying future prospects is one of the important tasks to establish a successful strategy for airport development. In this study, we use latent Dirichlet allocation (LDA), a typical topic modeling technique, to supplement the traditional qualitative methodologies and find a major trend of airport industry. Specifically, we deduct major topic from three different data sources related to airport (academic article, policy study report and news article) and compare each topic to find out the differences of each topic. In addition, we investigate the changing trend in each data source through longitudinal analysis. Our results show that three data sources have distinguishing trends which reflect their own characteristics. We find that most of data usually focus on the future situation for sustainable development rather than concentrating on the current issues. This study suggests a methodology using large amounts of text data to explore future promising trend from sperate data sources and provide insights for stakeholders of airport industry. The analyzing methodology we proposed has also significant meaning in that it can be applied comprehensively for trend analysis of other industry including tourism and hospitality as well as airport industry.

객체지향개발에서의 속성 클러스터링과 클래스 계층구조생성

이건호,Lee Gun Ho 한국정보처리학회 2004 정보처리학회논문지D Vol.11 No.7

객체지향 소프트웨어 개발 초기단계에서 클래스의 결정은 많은 객체와 관련된 속성들의 클러스터링을 하는 복잡한 문제이다. 클래스의 재사용을 위해 라이브러리에 클래스의 등록은 반복적인 시행착오에 의존하여왔다. 클래스를 등록하는 전통적인 방법과 모델링 혹은 설계단계에서 클래스와 그 계층구조의 정의를 위한 통합적인 방법에 대해 논의한다. 속성 클러스터링 문제를 위해 객체들의 속성 유사도에 근거하여 0-1 정수프로그램 위한 모형을 제시하고 또한 네트워크 기법을 이용한 클러스터링 알고리즘을 제안한다. 클래스 계층구조를 생성하기 위한 규칙을 제시하였으며 계층구조그래프 생성알고리즘을 제안한다. 본 연구결과를 이용하여 실제 현장의 문제를 사례로 제시한다. The clustering characteristics for a number of classes, and defining the inheritance relations between the classes is a difficult and complex problem in an early stage of object oriented software development. We discuss a traditional iterative approach for the reuse of the existing classes in a library and an integrated approach to creating a number of new classes presented in this study. This paper formulates a character-istic clustering problem for zero-one integer programming and presents a network solution method with illustrative examples and the basic rules to define the inheritance relations between the classes. The network solution method for a characteristic clustering problem is based on a distance parameter between every pair of objects with characteristics. We apply the approach to a real problem taken from industry.

압축기 분야 연구동향

이건호,신유환,Lee, Geon-Ho,Shin, Yu-Hwan 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.1