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      • KCI등재

        벼 색소체 형질전환을 이용한 글리포세이트 저항성 유전자 cp4-epsps의 발현

        강경수,김민균,Kang, Kyung-Su,Kim, Min-Kyun 한국식물생명공학회 2006 식물생명공학회지 Vol.33 No.2

        Heteroplasmic rice plastid transformant was generated using suspension cells as bombardment materials. PCR analyses confirmed incorporation of aadA and cp4-epsps genes into the rice plastid genome by homologous recombination events via the flanking sequences of the trnI and trnA. Transplastomic calli were actively proliferated when cultured on AAM2 medium supplemented with various concentrations (500-3000 mg/L) of streptomycin in dark condition, and transplastomic suspension cells showed resistance to nonselective herbicide, glyphosate. Through 'agarose pie selection' method, heteroplastomic calli, containing considerably high level of transplastome and expressing the CP4 EPSPS protein, were obtained. They were further regenerated to green shoots with healthy roots.

      • KCI우수등재

        재료특성의 변동을 고려한 고층건축구조물의 확률론적 시공단계해석

        강경수,구민선,유은종,Kang, Kyung-Soo,Gu, Min-Sun,Yu, Eun-Jong 대한건축학회 2011 대한건축학회논문집 Vol.27 No.11

        A probabilistic construction stage analysis using the SSM(Step-by-Step Method) and the Monte Carlo Simulation was performed to address the effects of uncertainty of the material properties for the construction stage analysis. Because of the common influencing factors in the material models for the creep and shrinkage, it is reasonable to assume that the creep and shrinkage behavior of concrete are correlated by some degree rather than completely independent. Thus, in this study, multiple sets of analyses by changing the correlation coefficients between the creep and shrinkage coefficients from 0 to 0.6 with an increment of 0.2 were performed, and the displacement estimates were compared. A two-bay plane frame structure was used for the example structure. Analysis results showed that the variance of total displacement also increases as the correlation between the creep and shrinkage was increased.

      • KCI등재

        중공 슬래브의 가진실험과 모드해석을 통한 동특성 분석

        강경수,Kang, Kyoung-Soo 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.6

        본 연구는 중공 슬래브의 보다 정확한 동특성을 구하기 위하여 중공부분에 의한 단면손실 효과를 반영한 해석모델을 이용한 모드해석결과와 가진실험 및 계측 결과를 비교 검토하였다. 이를 위해 중공 슬래브의 일종인 오메가형 데크 슬래브를 적용한 실제 시공 현장에서 가진실험 실시하여 계측을 통해 중공 슬래브의 동특성을 구하였다. 실제 중공 부분의 단면 감소효과를 고려하여 해석모델을 산정하여 모드해석을 수행하였다. 해석모델을 이용한 모드해석결과와 가진실험 계측결과를 비교 분석한 결과, 진동수의 경우 가진실험 계측과와의 오차가 2~7% 이내에 있음을 확인하였다. 그 결과 해석모델을 이용한 해석결과가 중공 슬래브의 진동해석에 충분한 정확도를 가지고, 슬래브 사용성 검토에 적용될 수 있음을 확인하였다. The purpose of this study is to get a more precise frequency of hollow core slabs by comparing the observed values from the actual free vibration tests and the predicted values based on the analysis model. The actual free vibration tests were carried out in the construction field using ${\Omega}$ shaped hollow core slabs. Modal analysis is conducted based on the analysis model that takes into account the differences in section properties due to void parts of slab. The differences between the predicted values based on the modal analysis with analysis model and the measured data from the actual tests range from 2~7%. This study demonstrates that the analysis model that incorporates void parts of slab could be used in evaluating serviceability of hollow core slabs with reasonable accuracies.

      • KCI등재

        인공태양을 이용한 모노리스 적용 반응기에서 2단계 열화학적 물분해 연구

        강경수,김창희,박주식,Kang, Kyoung-Soo,Kim, Chang-Hee,Park, Chu-Sik 한국수소및신에너지학회 2007 한국수소 및 신에너지학회논문집 Vol.18 No.2

        Solar energy conversion to hydrogen was carried out via a two-step thermochemical water splitting using metal oxide redox pair. To simulate the solar radiation, a 7 kW short arc Xe-lamp was used. Partially reduced iron oxide and cerium oxide have the water splitting ability, respectively. So, $Fe_3O_4$ supported on $CeO_2$ was selected as the active material. $Fe_3O_4/CeO_2$(20 wt/80 wt%) was prepared by impregnation method, then the active material was washcoated on the ceramic honeycomb monolith made of mullite and cordierite. Oxygen was released at the reduction step($1673{\sim}1823\;K$) and hydrogen was produced from water at lower temperature($873{\sim}1273\;K$). The result demonstrate the possibility of the 2-step thermochemical water splitting hydrogen production by the active material washcoated monolith. And hydrogen and oxygen was produced separately without any separation process in a monolith installed reactor. But the SEM and EDX analysis results revealed that the support used in this experiment is not suitable due to the thermal instability and coating material migration.

      • KCI우수등재

        독립성분분석(ICA)법을 이용한 병진-비틀림 연계된 구조물의 모드분리 및 응답기반 시스템식별

        강경수,김홍진,황재승,Kang, Kyung-Soo,Kim, Hong-Jin,Hwang, Jae-Seung 대한건축학회 2012 대한건축학회논문집 Vol.28 No.2

        The response of a lateral-torsionally coupled structure subject to dynamic wind loads can include the response for the along wind direction as well as that of the across and torsional directions. This study aims to propose a procedure to separate the modal responses from the lateral-torsionally coupled structural responses by using the independent component analysis(ICA) method and to effectively estimate the dynamic properties from the separated modal responses. The wind loads for the dynamic analysis of structure are generated from Karman wind speed spectrum for the along wind direction and an empirical overturning moment spectrum for the across wind direction. The kurtosis is introduced as the performance index for the mode separation by ICA. For the verification of the proposed method, a numerical simulation is performed. In the simulation, it is found that the lateral-torsionally coupled modal response can be separated precisely by ICA technique and very closely located modes can be also separated. From the numerical results, it is also shown that the modal properties such as natural frequencies and damping ratios are estimated effectively using the Hilbert transform and curve fitting, respectively. The results in this study show that the proposed method can be very usefully applied to the output-only system identification.

      • KCI등재

        지붕하중 증가에 따른 공장건물 안정성확보를 위한 지붕외장재의 구조성능정보의 필요성

        강경수,Kang, Kyung-Soo 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.11

        구조해석기법의 발전과 경제성을 중시하는 현실에 의해 건축물 주골조의 모멘트 강도비($M_u/{\Phi}M_n$)는 점차 증가하고 있다. 따라서 본 연구에서는 지붕재로 샌드위치패널을 사용하는 건축물의 안전성검토를 위하여, 지붕하중의 증가에 따른 구조해석을 실시하여 주구조부재의 $M_u/M_y$와 $M_u/M_p$의 변화를 검토하였다. 해석모델은 PEB구조 건물과 일반 H형강구조 건물을 대상으로 지붕하중을 증가시켜 구조해석을 실시하였다. 해석결과 해석모델의 지붕 설계하중의 약11% 증가할 경우, 주구조부재의 $M_u/M_y$가 1을 초과하였고, 약 36% 증가할 경우 작용모멘트가 소성모멘트보다 커져 부재의 파괴가 예상되었다. 중도리간격에 따른 지붕외장재가 지지할 수 있는 최대하중, KS기준에서 제시한 최대하중, 외장재생산업체의 시험값으로 산정한 최대하중을 비교하였다. 3가지 방법으로구한 패널이 지지할 수 있는 최대하중값은 주구조부재의 파괴가 예측되는 하중보다 큰 값을 나타내었다. 따라서 예상치 못한 지붕하중 증가로 인해 외장재의 파괴이전에 주구조부재의 파괴로 인한 구조물 전체 붕괴가 발생할 수 있으므로 안전성 확보를 위해서는 지붕외장재의 구조성능에 대한 정확한 정보의 필요성과 외장재 역시 구조설계대상임을 알 수 있었다. The strength ratio of the main structures of buildings gradually increasing, due to the advances made in analysis and cost saving techniques. In this study, to examine the stability of industry buildings using sandwich panels as roof assemblies, we examine the changes in the moment strength ratio of the main structures caused by increasing the roof load. This study adopts the PEB structure and three H-steel structure as the structural analysis models. In the case where the additional load exceeds about 11% of the roof design load, the strength ratio exceeds 1 for the main structure. In the case where the additional load exceeds about 36%(of the roof design load), the working moment exceeds the plastic moments, which leads to major damage to the structure. This study compares 1) the maximum load according to the purlin spaces, 2) the maximum load by KS, and 3) the maximum load calculated from the test results of the manufacturer.The maximum bearing load of the panels determined by all three methods exceeds the structure failure threshold load of the main structure. This study provides evidence that an unexpected increase in the roof load might cause the whole structure to collapse, due to the failure of the main structural members, before the failure of the roof assemblies. Therefore, information on the structural performance of the sandwich panels is required for the structural design, and the sandwich panels should be considered to be an integral part of the overall structural design.

      • 학교폭력 피해 사례분석을 통한 효율적 대책방안

        강경수(Kang Kyoung Soo),박상균(Park Sang Kyun),조철규(Cho Cheol kyu) 한국사회안전학회 2012 한국사회안전학회지 Vol.8 No.1

        요즘 사회적으로 심각한 문제점으로 지적되고 있는 것이 학교폭력 사고이다. 오래전부터 있어 왔지만 시대적 배경과 세대의 변화로 인해 잔인하고 흉폭하게 변질 되어 진행되고 있다. 학교폭력의 피해자들은 괴로움을 견디지 못해 자살을 하거나 잘못된 가치관으로 사회에 진출하여 사회구성원을 향해 무작위 살상 공격을 하는 등의 악순환을 가져온다. 시대적으로 변질되어진 학교폭력의 실질적 원인을 파악하여 모두가 공감할 수 있고 실현 가능한 정책을 펼쳐 계속적으로 발생되어지는 학교폭력을 방지하고 학교 구성원 모두가 학교라는 특수한 공간 안에서 맡은 역할을 성실히 수행 할 수 있도록 해야 할 것이다. As serious problems in society today is that school violence is an accident. Have long historical background and generation, but due to changes in the brutal and ferocious is going to be altered. Victims of violence in schools can not handle the pain of suicide, or an incorrect value entered in the society towards the community members, such as a random attack, a vicious cycle leads to destruction. Times the alteration being made of school violence substantially determine the cause and everyone can relate to, and feasible policies unfold continuously occur and which school violence prevention and school, all members of the school a special space in your role faithfully to perform need to make will be.

      • KCI등재

        반응압출 공정으로 개질된 PLA 나노복합체의 유변학적 및 열적 물성

        강경수(Gyeoung Soo Kang),김봉식(Bong Shik Kim),신부영(Boo Young Shin) 한국청정기술학회 2009 청정기술 Vol.15 No.2

        본 연구에서는 폴리락틱산(PLA)의 용융강도를 향상시키기 위하여 몬모릴로나이트(MMT), 기능성 단량체인 글리시딜 메타크릴레이트(GMA) 와 반응개시제를 함유한 PLA를 이축압출기로 개질한 후 열적 특성과 및 유변학적 특성을 조사하였으며, X선 회절장치(XRD) 및 투과전자현미경(TEM) 사진을 이용하여 MMT의 분산도를 측정하였다. 이 나노복합체의 T?는 GMA 함량이 증가하면 감소하는 경향을 보였으나, MMT의 양에는 크게 영향을 받지 않았다. 또한 표면분석에 의해 MMT의 양이 증가할수록 박리형(exfoliation) 보다는 삽입형(intercalation) 에 가까운 나노복합체가 형성된 것을 확인하였다. 복합점도 및 저장탄성률은 MMT의 첨가에 의해 크게 증가되었다. In this study, poly(lactic acid) (PLA) was modified by reactive extrusion with a functional monomer GMA(glycidyl methacrylate), MMT(montmorillonite), and initiator to enhance the melt strength. Each modified PLA was prepared with different amounts of GMA and MMT and was characterized by measuring thermal- and melt-viscoelastic properties. The degree of dispersion of MMT was measured by X-ray diffraction(XRD) and transmission electron microscopy(TEM). The glass transition temperature(T?) of modified PLA-GMA-MMT nanocomposite decreased with increasing GMA content, but was a little affected by the amount of MMT. Surface analysis showed that the nanocomposite became more intercalated than exfoliated as the amount of MMT increases. The complex viscosity and storage modulus of the nano-composite were greatly increased by addition of MMT.

      • KCI등재

        구조해석정보의 효과적 표현을 위한 IFC 구조해석모델 품질요건

        강경수(Kang, Kyung-Soo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.12

        IFC data model is a neutral and open specification to facilitate interoperability in the AEC building industry, and is a commonly used format for Building Information Modeling(BIM). It is intended to describe building and construction industry data. However, the structural engineering data is insufficient in quantity, and it is very difficult to properly represent the structural analysis information by using the IFC data model for the present. In this paper, IFC entities that can be used for structural analysis information were analyzed, and the specific characters of the structural analysis components, such as node, element, material, section, and load, were described. Then, it is suggested the several IFC structural analysis model rule sets to effectively accord with the IFC data model, and tested it by case studies. The suggested IFC structural analysis model rule sets are very practical way to generate a structural analysis model being coincident with the IFC2x3 specification, and very easy way to use in practice. By using these rule sets, it is expected to improve the IFC applicability, and finally it can be helpful for IFC to become wide-spread in structural engineering domain.

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