실리카흄을 흔입한 고강도 콘크리트 개발

홍창우,김태경,김경진,김성환,김남윤,심도식,이정호,윤청호,백민경,원치문,박제선,이주형,정경일 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-

콘크리트 구조물이 대형화됨에 따라 설계단면이 증대되어 상대적으로 많은 경제적 손실을 부담하게 된다. 따라서 단면을 감소시키면서도 소요의 하중에 안전한 구조물을 건설하기 위해서는 우선적으로 구조물 건설에 기초가 되는 고품질, 고내구성의 고강도 콘크리트 개발이 절실히 요구된다 본 연구에서는 일정 시멘트비 및 혼화재 비율하에서 소요의 워커빌리티가 확보되는 고강도 콘크리트를 시간과 온도의 변화에 따라 증기 양생하여, 압축, 인장, 휨강도 뿐만 아니라 파괴특성을 실험적으로 연구하였다. 시료 제작시 시멘트 입자 사이의 공극 및 불연속 영역을 충전하여 고밀도화하기 위한 콘크리트용 혼화재로 시멘트 비표면적이 상당히 작은 초미립 분말인 실리카흄을 이용하였다. 또한 AE감수제 및 고성능 유동화제를 사용하여 혼화재의 첨가에 의하여 발생될 수 있는 워커빌리티의 감소를 방지하였다. 실험결과에 의하면 일정 양생 지속 시간하에서 온도의 증가에 따라 콘크리트의 압축, 인장 및 휨강도가 전반적으로 증가하였다. 동일하게 일정 온도하에서 양생 지속시간이 커짐에 따라 강도들이 증가됨을 알 수 있었다. 따라서 상대적으로 높은 온도와 긴 지속 양생 조건하에서 파괴에 대한 저항력이 크게 나타났다. The compressible, tensible, and flexibleresistance of the high strength concrete is analyzed by the experimentation in the present study. For the test, we cure several samples with the silica fume as a mixture being become dense the spaces between the particle of cement under the variation of both the temperature and the curing-interval. Then, the superplasticizer and the ezcon are also used to satisfy the required workability for construction. The compressible, tensible, and flexible resistances to a stress are increased as increasing the temperature and the time interval for the curing. Therefore it is concluded that the overal fractural and mechanical properties is improved by mixing the silica fume into the cement.

유아의 사회적 능력에 따른 창의성의 변화 비교

우수경(Soo Kyeong Woo),김호(Ho Kim),박숙희(Sook Hee Park) 한국열린유아교육학회 2015 열린유아교육연구 Vol.20 No.1

본 연구는 유아의 사회적 능력 수준에 따른 창의성의 변화를 비교하기 위하여 T광역시 소재 유치원의 만 4세 유아 147명을 대상으로, 우수경(2002)의 유아 사회적 능력 검사와 전경원(2001)의 유아 도형 창의성 검사를 실시하였다. 연구 결과, 첫 째, 사회적 능력이 높은 유아들이 낮은 유아들보다 창의성이 높은 것으로 나타났다. 그리고 사회적 능력과 창의성 측정 시기 간에 상호작용 효과가 있는 것으로 나타나, 사회적 능력이 높은 유아들의 창의성은 측정 시기마다 점점 증가한 반면, 사회적 능 력이 낮은 유아들은 창의성이 증가했다가 다시 감소하였다. 둘째, 창의성 하위요인별 로 볼 때, 유창성, 독창성, 개방성은 사회적 능력에 따라 차이가 있으나, 민감성은 차 이가 없었다. 그리고 창의성 하위요인 중 독창성은 사회적 능력과 독창성의 측정 시 기 간에 상호작용 효과가 있는 것으로 나타나, 사회적 능력이 높은 유아들의 독창성 은 측정 시기마다 점점 증가한 반면, 사회적 능력이 낮은 유아들은 독창성이 증가했 다가 다시 감소하였다. This study investigates the relationships change process between young children``s creativity and social competence. Participants consist of 147 kindergarten children in T-city. The instruments are Woo``s(2002) Children``s Social Competence Scale and Chon``s(2001) the Korean Figural Creativity Test for Young Children. The main findings of this study are as follows. First, a child’s creativity differs according to the child’s level of social competence. Children displaying high social competence demonstrate, as time goes by, increased creativity. Second, a child’s fluency, originality, and openness differ according to the child’s level of social competence, though no difference is observed regarding sensitivity. An interaction effect is found in originality and social competence such that a high level of social competence is associated, as time goes by, with an increase in originality.

태생 36주에 발견한 선천성 에푸리스(congenital epulis)의 치험례

김가영,권오승,백경식,송우식,김인권 大韓顎顔面成形再建外科學會 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.4

The congenital epulis of newborn is a rare benign tumor that occurs on the gingiva of the anterior alveolar ridge of the jaws, also known as a congenital granular cell tumor. Females are affected 8 - 10 times more often than males. The typical location is the alveolar ridge of the maxilla near the canine but the mandibular region can also be involved. The lesion may be sessile or pedunculated with red or normal color. The size of tumor varies from several millimeters to a few centimeters in diameter. Surgical excision is generally indicated and no recurrences have been noticed. Spontaneous regression is rare. It is histologically similar to the granular cell tumor, although pseudoepitheliomatous hyperplasia does not occur in the former lesion. Thus sheets of large, closely packed cells showing fine, granular, eosinophilic cytoplasm comprise the tumor mass. This is a case report of congenital epulis in the fetus. The lesion was detected in ultrasonogram, its size is 3cm in diameter. The infant showed nursing disturbance and respiratory obstruction after birth, so the tumor was surgically excised under local anesthesia.

모션 인식 기반 스마트 미러

김경진,백경동,신진우,박동규 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.1

The Internet of Things, the core of the Fourth Industrial Revolution, is growing by applying various technologies to various fields. Among them, smart home systems that apply IoT technology to home environments are actively being researched, and the home hub market, which is a communication medium for smart homes, is also developing at the same time. However, the security damage from cyber attacks, which are vulnerabilities in IoT technology, is also increasing in proportion to these developments. In this paper, mirror is implemented as an IoT service hub. It can be used in any space where a mirror is installed, and gesture recognition allows control of existing infrared-based devices as well as certain compatible devices. In addition, the system to solve security problems was implemented by applying AES algorithms between all data communications.

음성 인식 헬스케어 시스템

신진우,조우승,조성빈,김재훈,정지은,사예지,백경동,박동규 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2

As modern people's interest in health grows, wearable healthcare-related technologies that can collect biometric information and receive health-related services regardless of time and place are developing. This paper proposes the healthcare system based on voice recognition function. Unlike conventional wearable healthcare systems, the proposed system provides real-time telemedicine and diagnosis and the direct connection with doctors is possible through it. And almost all functions of the application in it are operated with voice commands to lower user access barriers. Because it deals with personal information including medical information, encryption algorithms have been applied between all data movements. Finally, the healthcare system proposed in this paper is expected to increase convenience in health care and reduce the medical gap.

브리지만법에 의해 성장된 p-GaSe 단결정의 전자 이동도에 관한 연구

이우선,김남오,손경춘 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1

이방성 담낭(Bicameral Gallbladder) : 1례 보고

이현경,오연희,김승현,이성우,안우섭 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

담낭의 선천성 기형 중 이방성 담낭은 매우 드문 기형으로 저자들은 우상복부 동통을 주소로 내원하여 초음파, 전산화 단층 촬영, 간담도 스캔 검사에서 이방성 담낭으로 진단되고 수술로 확진된 이방성 담낭(Bicameral GB) 1례를 경험하였기에 문헌 고찰과 함께 보고 하고자 한다. The bicameral gallbladder is one of the rarest congenital malformation of the gallbladder. A 26 years-old male was examined for the colicky pain in right upper quadrant area. On sonographic examination the lumen of gallbladder was partitioned, nearly completely, into two chamber(fundal and ductal) that are of approximately equal size. There was gallbladder wall thickening with cholelithiasis in the fundal chamber. Surgical finding showed bicameral gallbladder divided into two camber of same size and gallbladder wall thickening with cholelithiasis in the fundal chamber.

티탄소 스트롬튬 상유전성 박막의 전기전도도 특성에 관한 연구

이우선,손경춘,김남오 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

Temperature and frequency dispersion of dielectric permittivity was investigated on thin films of SrTiO_(3) deposited by on RF magnetron reactive sputtering. The thin films deposited on Ag/Si substrates. The SrTiO_(3) films was confirmed by XRD and it is exhibited by SEM that a uniform and fine grain structure. The electrical conduction of the films properties were dependent on temperature or frequency. Resistivity decrease with temperature and electric fild. Dielectric constant of the films properties were the highest value(ε_(r) = 300) and dependent on frequency.

STO 박막 캐패시터의 온도의존성

이우선,손경춘,김남오 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1

STO thin films on Si substrate were deposited by on RF magnetron reactive sputter with various substrate temperature and film thickness. SEM analyses showed that STO films had a uniform and fine grain structure. The capacitance of the films properties were the highest value(1000pF) and dependent on substrate temperature. Dielectric constant of the films properties were the highest value(ε_(r) = 300) and dependent on film thickness.

인삼사포닌의 마우스 비장 임파구에 대한 면역활성

정경수,이대우,양희정,이순철,김길현 충남대학교 약학대학 의약품개발연구소 1994 藥學論文集 Vol.10 No.-

To ellucidate immunologic activities of ginseng saponin, the splenic leukocytes of BALB/c mice were incubated in RPMI medium for 48hr with or without ginseng total saponin(GTS), and then analyzed flow cytometrically. Upto the concentration of 100㎍/㎖, GTS exherted stimulatory effect on the immune cells most prominently on B cells: the percentage of the surface Immunoglobulin (sIg) -positive cells (B cells) of the control was 47.l%, while that of GTS treated was 58.9%. The percentages of monoclonal antibody(mAb) J1j-reactive cells (T cells) were 28.8% and 3l.3%, those of mAb Gkl.5-reactive cells (CD4' T cells) were l8.5% and l9.l%, and those of mAb M1/70-reactive cells (mostly macrophages) were 4.4 and 5.0% at the concentration of 0 and 100㎍/㎖, respectively. However, at the concentration of 300㎍/㎖ or higher, GTS was found to be toxic to the immune cells especially to B cells in that the flow rate of the cells (gated viable cells) significantly decreased and the percentage of B cells droped from 58.9% to 31.2% and 25.4% at l00, 300, and 1000㎍/㎖, respectivelly. These data strongly suggests that GTS would exhert B-cell mitogen-like activity at physiological concentrations of 100㎍/㎖ or lower.