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강수민,김승일,차경환,김화돈 中央醫學社 1972 中央醫學 Vol.22 No.3
A new syndrome of carotid occlusion following a minor head injury not obviously involving the neck is reported in one patient. 23 year old Korean Army soldier was admitted to department of neurosurgery in Pusan Military Hospital on March 2, 1970, because of minor head injury and fracture of right femur due to an automobile accident. At the admission time, no specific neurological sign except mild. drowsy mental state. 22 hours after an automobile accident, he became drowsy and developed right hemiparesis and facial palsy on the right side. Right carotid angiogrom was revealed an obstruction of the right internal carotid artery about l cm distal to the bifurcation of the common carotid. Left carotid angiogrom was normal, finding. The characteristic delayed onset of unilateral motor and sensory defects in the relatively young patient is discussed. Minor craniocerebra trauma resulting in carotid occlusion is a rare event. The syndrome of carotid occlusion following minor, craniocerebral trauma includes hemiplegia, hemianesthesia, and homonymous visual field defects. We present one of internal carotid artery occlusion without obvious neck injury, which we feel represent a special syndrome of carotid occlusion following minor craniocerebral trauma.
Manufacturing of Nanostructured Melanin Films by LBL Assemblies
강수민,엄태식,심봉섭 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Melanin, which is natural pigment, has a potential possibility as an electrical conductive material. In this research, we used 100-150 nm diameter natural melanin nano-particles (NMNPs), extracted from cuttlefish ink, and made the uniformly covered NMNP film by layer-bylayer assembly technique (LBL) with poly(vinyl alcohol) (PVA) on a glass substrate. We optimized LBL condition by varying various solvents and dipping times to make optimum NMNP film, which was characterized by UV-Vis absorbance, scanning electron microscope (SEM) and atomic force microscope (AFM). This film shows electrochemically conductive properties on an ITO electrode by providing improved charge storage capacity. Furthermore, this composite film also demonstrates structural colors, and proves biocompatibility with PC12 cell. These results suggest that our NMNP film has the high potential for use as biocompatible optoelectronic materials for bio-organic electronics, neural interfaces and implantable biosensors.
래티스를 이용한 철근콘크리트 무량판 구조의 슬래브-기둥 접합부 전단보강 공법 개발
강수민,박성우,방중석,이도범,권철환,박홍근 한국건축시공학회 2013 한국건축시공학회지 Vol.13 No.5
무량판 슬래브 구조는 시공의 단순함과 낮은 층고, 그리고 다양한 평면구성의 용이함으로 인하여 구조적으로효과적이나 슬래브-기둥 접합부가 중력하중에 의한 펀칭전단파괴와 횡하중의 불균형모멘트에 의한 편심전단파괴에 취약한 단점이 있다. 이러한 무량판 슬래브의 취약점을 방지하기 위하여 많은 보강공법들이 개발되었으나, 보강공법들은 구조적 성능과 경제성, 그리고 시공성을 모두 만족시키기지는 못하고 있다. 이 논문에서는 래티스를 이용한 무량판 구조의 슬래브-기둥 접합부 보강공법을 제시하였다. 주기하중 실험을 통하여 래티스 보강공법의 구조적 성능을 증명하였으며 같은 구조설계 조건에 대하여 스터럽과 스터드레일, 그리고 래티스를 이용한 공법을 적용해 봄으로써 경제성을 입증하였다. Although the flat plate system is an efficient structural type due to the simplicity of its construction, the low storyheight, and the various plan design, the slab-column connections are vulnerable to punching shear failure from gravityload and eccentric shear failure from lateral load. To prevent the structure collapse, various construction methods ofslab-column connection reinforcement are developed but none of these satisfies all of structural performance,economics, and constructability. This paper presents the reinforcement of slab-column connection with lattice bars. Thestructural performance is confirmed with the interior slab-column connection tests subjected to cyclic loading, and theeconomic feasibility is demonstrated from the structural design under the same condition with lattice bars, stud rails,and stirrups.
Reshoring effects on deflections of multi-shored flat plate systems under construction
강수민,엄태성,김재요 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.45 No.4
RC flat plates that have no flexural stiffness by boundary beams may be governed by a serviceability as well as a strength condition. A construction sequence and its impact on the distributions of construction loads among slabs tied by shores are decisive factors influencing immediate and long term performances of flat plate. Over-loading and tensile cracking in early-aged slabs significantly increase the deflection of a flat plate system under construction. A reshoring work may be helpful in reducing slab deflections by controlling the vertical distributions of construction loads in a multi-shored flat plate system. In this study, a change of construction loads by reshoring works and its effects on deflections of flat plate systems under construction are analyzed. The slab construction loads with various reshoring schemes are defined by a simplified method, and the practical calculation of slab deflections with considering construction sequences and concrete cracking effects is applied. From parametric studies, the reshoring works are verified to reduce construction loads and slab deflections.
가을철 독도 연안에 출현하는 대형저서동물의 종 조성 및 군집 구조
강수민,이형곤,김상렬,최진우,박찬홍,유옥환 한국해양과학기술원 2019 Ocean and Polar Research Vol.41 No.2
The Dokdo coast is known for its high biodiversity. However, few studies have examined the biodiversity and macrobenthic community on the subtidal soft-bottom. Therefore, we collected macrobenthos (> 1 mm) using a Smith-McIntyre grab (0.1 m2) at 15 stations along the Dokdo coast in September 2016. The sediments consisted of badly sorted (1.7) coarse sand with gravel and the mean sediment grain size was -0.4ø. In total, 177 macrobenthic species were collected; their mean density was 1,566 ind./m2. The number of species and density of macrobenthic fauna decreased significantly with the mean grain size. The dominant species were the amphipods Melita denticulata (16.5%) and Melita shimizui (5.5%), polychaete Salvatoria clavata (5.4%), bivalve Glycymeris aspersa (4.4%), and ophiuroid Ophionereis dubia (4.3%). The dominant macrobenthos species on the subtidal soft-bottom differed from the coastal areas of the East Sea, suggesting that the difference in the sediment grain size affected the macrobenthos. Cluster analysis was performed to divide the study area into four groups, and environmental factors which correlated with species composition and distribution in the study area were the combination of the four parameters of salinity, dissolved oxygen, total organic carbon and depth. A future seasonal investigation is needed to understand the species composition and characteristics of the Dokdo macrobenthos.