특강2 : 촉매계면활성제를 이용한 구리의 화학증기증착

황의성,이지화 대한금속재료학회 ( 구 대한금속학회 ) 1999 대한금속학회 추계학술대회 개요집 Vol.1999 No.-

Decompressive Surgery in Patients with Poor-grade Aneurysmal Subarachnoid Hemorrhage: Clipping with Simultaneous Decompression Versus Coil Embolization Followed by Decompression

황의성,신희섭,이승환,고준석 대한뇌혈관외과학회 2014 Journal of Cerebrovascular and Endovascular Neuros Vol.16 No.3

Objective : In addition to obliterating the aneurysm using clipping or coiling,decompressive surgery for control of rising intracranial pressure (ICP)is thought to be crucial to prevention of adverse outcomes in patientswith poor grade aneurysmal subarachnoid hemorrhage (aSAH). We evaluatedthe clinical characteristics of patients with poor-grade aSAH, andcompared outcomes of aneurysmal clipping with simultaneous decompressivesurgery to those of coil embolization followed by decompression. Materials and Methods : In 591 patients with aSAH, 70 patients with H-Hgrade IV and V underwent decompressive surgery including craniectomy,lobectomy, and hematoma removal. We divided the patients into twogroups according to clipping vs. coil embolization (clip group vs. coilgroup), and analyzed outcomes and mortality. Results : Aneurysmal clipping was performed in 40 patients and coil embolizationwas performed in 30 patients. No significant differences in demographicswere observed between the two groups. Middle cerebral arteryand posterior circulation aneurysms were more frequent in the clip group. Among 70 patients, mortality occurred in 29 patients (41.4%) and 61 patients(87.1%) had a poor score on the Glasgow outcome scale (scores I-III). Nosignificant difference in mortality was observed between the two groups,but a favorable outcome was more frequent in the coil group (p < 0.05). Conclusion : In this study, despite aggressive surgical and endovascularmanagement for elevated ICP, there were high rates of adverse outcomesand mortality in poor-grade aSAH. Despite poor outcomes overall, earlycoil embolization followed by decompression surgery could lead to morefavorable outcomes in patients with poor-grade aSAH.

MOCVD로 증착된 구리 필름의 초기성장 및 증착조건에 따른 박막특성

황의성,이영록,이지화 한국진공학회 1995 Applied Science and Convergence Technology Vol.4 No.s1

MOCVD of Cu films were carried out on gold-TiN(1000$\AA$)/Ti/Si wafers from hexafluoroacetylacetonate-Cu(l) vinyltrimethylsilane, Cu(l)(hafac)(vtms), in a small cold-wall type reactor. Effects of the substrate and bubbler temperatures on the film growth rate were studied, and a film with $\rho$=1.8$\pm$0.1$\mu$$\Omega$.cm could be deposited 150nm/min at Ts=200 and Tb=$30^{\circ}C$, respectively. The initial stage of the film formation was also investigated by in-situ laser reflectivity monitoring combined with SEM observations, based on which variations in the film properties depending on the growth conditions were discussed in terms of the nucleation rate and grain size.

CAM-Shift 알고리즘을 이용한 MPEG-4 Visual의 VOP(Video Object Plane) 추출

황의성,정재진,김태형,김두영 동아대학교 정보기술연구소 2006 情報技術硏究所論文誌 Vol.14 No.1

MPEG-4 for an object base coding after extracting the region from image, the coding for a real-time requirements is quick and must be accurate. The object crisis algorithms of existing calculation quantity are many and with image transformation or video conferencing system to same real-time application they are not suitably. The object real-time tracking it tried to apply the CAM-Shift algorithm which is possible from the dissertation which it sees consequently. Tracking the object which it moves or wants the VO where (Video Object) tracking the user wants in bounding box form defines the object where is started. Tracking the object of after uses a CAM-Shift algorithm and are extracted and the VOP with the VO which it is composed. It defines one bounding box with the method which is proposed consequently about lower only one VOP there to be it will be able to compose, it becomes.

사례 분석을 통한 복합말뚝 이음위치의 설계 기준식 개선 연구

황의성 한국지반환경공학회 2019 한국지반환경공학회논문집 Vol.20 No.3

Composite pile, which is composed of the steel pipe pile in which the large horizontal force acts and the PHC pile in which the small horizontal force acts by a special connecting devices, is being commercialized as a base material for civil engineering structures. The core of such a composite pile can be said to be a design criterion for estimating the joint position and stability of the connection device between steel pipe pile and PHC pile. In Korea, there is no precise specification for the location of composite pile joints. In the LH Design Department (Korea Land & Housing Corporation, 2009), “Application of composite pile design and review of design book marking” was made with reference to Road Design Practice Volume 3 (Korea Expressway Corporation, 2001). this is used as a basis of the design of the composite pile. It can not be regarded as a section change of the composite pile, so it has a limitation in application. Therefore, In this study, we propose a design criterion for the location of the section of the composite pile (joint of steel pipe pile and PHC pile) and evaluate the stability and economical efficiency of it by using experimental method and analytical method. Analysis of composite pile design data installed in 79 domestic bridges abutment showed that the stresses, bending moments, and displacements acting on the pile body and connection of the pile were analyzed. Through the redesign process, it was confirmed that the stresses generated in the connecting device occur within the allowable stress values of the connecting device and the PHC pile. In conclusion, the design proposal of composite pile joint location through empirical case study in this study is an improved design method considering both stability and economical efficiency in designing composite pile. 복합말뚝(Composite Pile)이란, 수평력이 크게 작용하는 구간에는 강관말뚝, 작게 작용하는 구간에는 PHC말뚝을 특수한 연결 장치로 결합한 말뚝으로서 토목 구조물의 기초 재료로써 상용화되는 추세에 있다. 이러한 복합말뚝의 핵심은 강관말뚝과 PHC말뚝을 연결하는 연결 장치의 안정성과, 이음 위치를 산정하는 설계기준이라고 할 수 있는데 국내에서는 복합말뚝 이음부 위치에 대한 정확한 시방규정이 없어서, LH 설계처(한국토지주택공사, 2009)에서는 도로설계요령 제3권(한국도로공사, 2001)을 참고하여 작성한 “복합말뚝 설계적용 및 설계도서 표기 방안 검토”를 복합말뚝 설계의 기준으로 사용해 오고 있지만 복합말뚝의 단면변화라고 볼 수 없어 적용에 한계성을 가지고 있는 실정이다. 이에 따라 본 연구에서는 복합말뚝의 단면 변화부(강관말뚝과 PHC말뚝의 이음부) 위치에 대한 설계기준을 제안하고 이에 대한 안정성 및 경제성을 검토하고자 실험적인 방법과 해석적인 방법을 이용하여 연결장치에 대한 안정성을 검증하였으며, 국내 교량공사 교대 79개소에 시공된 복합말뚝 설계자료를 분석하여 말뚝 본체 및 이음부에 작용하는 응력, 휨모멘트, 변위 등의 경향성을 파악하였고, 개선식이 적용된 재설계 과정을 통해 이음부에서 발생한 응력들이 연결장치와 PHC말뚝의 허용응력 수치 내로 발생하는 것을 확인하였다. 결론적으로 사례분석을 통한 복합말뚝 이음위치의 설계 제안식은 복합말뚝을 설계함에 있어서 안정성과 경제성을 모두 고려한 개선된 설계기법임을 알 수 있었다.

퍼지 이론을 이용한 D. C. 모우터의 위치 제어기 설계에 관한 연구 ( A Study on the Design of the Position Controller of D. C. Motor Using Fuzzy Theory )

황의성,한상수,박준열 대한전자공학회 1991 대한전자공학회 학술대회 Vol.1991 No.1

마술을 활용한 중학생 영어 학습 효과 연구

황의성(Hwang, Eui Seong),민찬규(Min, Chan Kyoo) 한국영어교과교육학회 2010 영어교과교육 Vol.9 No.3

This paper aims to investigate the effects of teaching English through magic to first grade middle school students. The experimental group and the control group were chosen based on their pretest results and were compared after 10-week treatments in the following two areas: academic achievement and affective domain. The results are as follows. First, the experimental group showed better performance in the post-test than the control group. In addition, a significant statistical difference in the post-test scores was also observed between the two groups. The post written test was composed of three parts: vocabulary, grammar, and reading comprehension. Among the three parts, the participants in the experimental group demonstrated the most noticeable improvement in reading comprehension. A significant statistical difference between the two groups occurred only in reading comprehension. Second, concerning affective domain, the subjects in the experimental group showed substantially enhanced interest and motivation, although they did not show as much confidence as interest. This result implies that using magic in English class is useful and effective to stimulate learners’ interest and intrinsic motivation. Third, according to questionnaire results collected from both the 31 participants and 15 secondary teachers who participated in the study, more than 50% of them responded that using magic in English class helped them greatly with their English learning and teaching respectively.

웹 기반의 복수 비디오 대여점 관리 시스템 설계

황의성(Eui-Sung Hwang),황원록(Won-Rock Hwang),강태구(Tae-Goo Kang),제원섭(Won-Sub Je),김정인(Jung-In Kim) 한국멀티미디어학회 2003 한국멀티미디어학회 학술발표논문집 Vol.2003 No.1

재하시험을 통한 초고강도 선단확장 PHC말뚝의 적용성 연구

황의성(Ui-Seong Hwang) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.3

경제 규모의 확장으로 국가 산업이 점차 발전해 나갈수록 사회 인프라를 구축하기 위한 대형·초고층 구조물의 건설이 증가함에 따라 상부의 큰하중을 하부의 암반지지층까지 안전하게 전달할 수 있는 연구가 활발히 이루어지고 있다. 본 연구에서는 우리나라의 단단한 암반층을 활용하여 지지력을 극대화 할 수 있도록 PHC의 콘크리트 압축강도를 기존 80 MPa에서 110 MPa로 높인 초고강도PHC에, 말뚝의 선단을 확장시킨 선단확장PHC를 항타공법과 매입공법으로 시공한 후 재하시험을 통해 지지력의 경향성을 확인해 보았다. 항타공법을 사용하여 선단확장PHC의 지지력을 측정해 본 결과 주면마찰력이 일반 PHC에 비해 작게 나타났으며, Stet-up 효과도 미미하게 나타나 지지력 측면에서 우위를 가질 수 없었다. 그러나 매입공법 적용시 주면마찰력의 발휘 효과는 주면부와 지반의 간격이 넓어 시멘트페이스트가 밀실히 채워질 경우 지지력 증가효과가 기대된다. 또한 초고강도PHC가 일반PHC에 비해 높은 지지력이 나타났으며, 허용항타응력도 60% 이내로 나타나 좀 더 견고한 지반까지 안전한 시공이 가능하였다. 따라서 초고강도PHC의 높아진 강도를 활용하기 위해서는 말뚝의 선단부를 연암의 강도를 지닌 지반에 설계하는 것이 말뚝 본수를 크게 절감 할 수 있으며, 시공비 절감과 공기단축의 효과도 얻을 수 있을 것이다. As the national industry is developing gradually due to the expansion of the economic scale, the construction of large and super high-rise structures for building social infrastructure has been increasing, and studies have been conducted actively to transmit the large loads at the upper portion to the lower bedrock. In this study, the PHC was extended to an ultra-high strength PHC, which increased the concrete compressive strength of the PHC from the conventional 80 MPa to 110 MPa, and the PHC, which extended the tip of the pile. After construction with the driving method and injected pile method, the tendency of the bearing capacity was tested through a load test. Measurements of the bearing capacity of the extended PHC using the pile driving method revealed the main surface friction force to be smaller than that of the general PHC, and the stet-up effect was also insignificant. On the other hand, the effect of the friction force on the ground surface when the injected pile method was applied is expected to increase the bearing capacity when the gap between the main surface and the ground is wide and the cement paste is filled tightly. In addition, the ultrahigh strength PHC showed higher bearing capacity than the conventional PHC, and the permissible pile stress was less than 60%. Therefore, it is possible to reduce the number of piles and reduce the construction cost and effect of shortening the length of the pile by designing the tip of the pile on the ground with the intensity of soft rock as a method for utilizing the increased strength of the ultra-high strength PHC.

SIP 말뚝의 비선형 수치모델식 산정

황의성(Hwang Yi-Sung),도종남(Do Jong-Nam),김도형(Kim Do-Hyeong),천병식(Chun Byung-Sik) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10