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          • SCOPUSKCI등재

            Developing Coarse-Grained Force Fields for Polystyrene with Different Chain Lengths from Atomistic Simulation

            Rao,,Shuling,Li,,Xuejin,Liang,,Haojun The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.7

            We developed a coarse-grained force field and have extended it to polystyrene with longer chain length. A systematic method was introduced and was utilized to explain how the coarse-grained force field for polystyrene could be developed from the atomistic simulation in the paper. We elected to use polystyrene with different chain lengths of 20, 40 and 80 monomers in this study. In three cases, we utilized the same new mapping scheme. The coarse-grained force field does reproduce the bond, angle, and radial distribution of the atomistic model. The coarse-grained model proved successful, as shown by analyses of the static and dynamic properties of different chain lengths.

          • KCI등재SCOPUS

            A Fixed-time Distributed Algorithm for Least Square Solutions of Linear Equations

            Shuling,Li,Wu,Ai,Jian,Wu,Quanxi,Feng 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.3

            This study presents a fixed-time convergent algorithm to achieve distributed least square (DLS) solutions of networked linear equations. Each agent in the network only knows a subset of the equations and can only exchange messages with its nearest neighbors. Unlike finite-time counterparts, the settling time of the fixed-time distributed algorithm does not depend upon the initial states, and can be preassigned according to the requirements of the task. Numerical simulations verify the theoretical results.

          • KCI등재

            Influence of Lubricant on the Properties of Poly(ether ether ketone) and Poly(ether ether ketone)/Carbon Fiber Composites

            Shuling,Zhang,Jianxin,Mu,Dianfu,Ren,Fugui,Zhou,Zhenhua,Jiang,Zhongwen,Wu,Guibin,Wang 한국고분자학회 2010 Macromolecular Research Vol.18 No.12

            An improvement in the processability of poly(ether ether ketone) (PEEK) and PEEK/carbon fiber (PEEK/CF) composites with less influence on the other properties is important. A novel high temperature lubricant, GENIOPLAST PELLETS (GPPS), was used to decrease the melt viscosity of PEEK and PEEK/CF composites. PEEK/GPPS and PEEK/CF/GPPS compounds were characterized by dynamic rheometry, universal tester, scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results showed that a small amount of GPPS could decrease the melt viscosity of the compounds during processing,and improve the dispersion uniformity of the carbon fiber in the PEEK matrix, and further enhance the tensile strength of PEEK/CF composites, but have little effect the thermal stability of the compounds.

          • KCI등재SCOPUS

            Action Recognition with deep network features and dimension reduction

            Lijun,Li,Shuling,Dai 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.2

            Action recognition has been studied in computer vision field for years. We present an effective approach to recognize actions using a dimension reduction method, which is applied as a crucial step to reduce the dimensionality of feature descriptors after extracting features. We propose to use sparse matrix and randomized kd-tree to modify it and then propose modified Local Fisher Discriminant Analysis (mLFDA) method which greatly reduces the required memory and accelerate the standard Local Fisher Discriminant Analysis. For feature encoding, we propose a useful encoding method called mix encoding which combines Fisher vector encoding and locality-constrained linear coding to get the final video representations. In order to add more meaningful features to the process of action recognition, the convolutional neural network is utilized and combined with mix encoding to produce the deep network feature. Experimental results show that our algorithm is a competitive method on KTH dataset, HMDB51 dataset and UCF101 dataset when combining all these methods.

          • KCI등재SCIESCOPUS

            Experimental and numerical investigation on bearing mechanism and capacity of new concrete plug structures

            Yonghong,Weng,Shuling,Huang,Tangjin,Xu,Yuting,Zhang 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.24 No.5

            The stability and safety of concrete plug structure of diversion tunnel is crucial for the impoundment of upstream reservoir in hydropower projects. The ongoing Wudongde hydropower plant in China plans to adopt straight column plugs and curved column plugs to replace the traditional expanded wedge-shaped plugs. The performance of the proposed new plug structures under high water head is then a critical issue and attracts the attentions of engineers. This paper firstly studied the joint bearing mechanism of plug and surrounding rock mass and found that the quality and mechanical properties of the interfaces among plug concrete, shotcrete, and surrounding rock mass play a key role in the performance of plug structures. By performing geophysical and mechanical experiments, the contact state and the mechanical parameters of the interfaces were analyzed in detail and provide numerical analysis with rational input parameters. The safety evaluation is carried out through numerical calculation of plug stability under both construction and operation period. The results indicate that the allowable water head acting on columnar plugs is 3.1 to 7.4 times of the designed water head. So the stability of the new plug structure meets the design code requirement. Based on above findings, it is concluded that for the studied project, it is feasible to adopt columnar plugs to replace the traditional expanded wedge-shaped plugs. It is hoped that this study can provide reference for other projects with similar engineering background and problems.

          • KCI등재

            Preparation and Characterization of Hyperbranched Poly(ether ether ketone)s Suitable as Rheology Control Agents for Linear Poly(ether ether ketone)s

            Zhenhua,Jiang,Xiujie,Li,Shuling,Zhang,Fugui,Zhou,Jinhui,Pang,Chunfeng,Zhang,Dong,Sun,Jianxin,Mu,Guibin,Wang 한국고분자학회 2011 Macromolecular Research Vol.19 No.5

            Hyperbranched poly(ether ether ketone)s (HPEEKs) that were suitable as rheology control agents for linear poly(ether ether ketone)s (LPEEKs) were first prepared via commercially available hydroquinone (A2 monomer,HQ) and synthesized 3,4',5-trifluoro-benzophenone (BB'2 monomer, TF) effortlessly. The polymerization mode of A2 + BB'2 was demonstrated by MS. Moreover, FTIR, 1H NMR, 13C NMR, and 19F NMR spectroscopy revealed the structure and degree of branching (DB) of the resulting polymers. In comparison with A2 + B3 approach, HPEEK prepared using an A2 + BB'2 strategy possessed a higher molecular weight, and improved the melt processability of LPEEK. Remarkably, with the addition of HPEEK, the mechanical properties of LPEEK increased with a HPEEK content of 5%. The improved mechanical properties were attributed to the good miscibility. Moreover, the addition of HPEEK did not decrease the thermal stability of LPEEK.

          • SCIESCOPUSKCI등재

            Experimental studies on elastic cooling and pyromagnetic effect of polyvinyl chloride sheets with defects

            Luo,,Yingshe,Chen,,Shengming,Zhang,,Liang,Su,,Jianxin,Zhang,,Yongzhong,Luo,,Shuling 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.3

            Polyvinyl Chloride (PVC) sheets were made into samples with precast defects for uniaxial tensile test. The tests are carried out under room temperature with conditions of same displacement rate but different defect sizes or of same defect but different displacement rates. The local nonuniform temperature field on whole deformation area of specimen is recorded with a thermal infrared imager and the whole coupling magnetic field with thermal changes in experiments is detected and measured by a self-developed sensors system. The experimental results show that, in a complete tensile test process of PVC samples, the temperature reduction phenomenon emerges firstly in its elastic deformation stage (areas) that temperature of specimen is cooler than room temperature. And then in viscoplastic deformation period (areas), the temperature increases sharply to be obviously higher than room temperature due to the thermo-mechanical coupling effection of tensile load and viscoplastic deformation heat. These thermal variations lead a coupling pyromagnetic effect occur and the effect intensity is dependent strongly on the strain rate and/or the size of defects. The temperature prejudgment conditions for materials yield are preliminary discussed based on this effect.

          • SCIESCOPUSKCI등재

            Action Recognition with deep network features and dimension reduction

            Li,,Lijun,Dai,,Shuling Korean Society for Internet Information 2019 KSII Transactions on Internet and Information Syst Vol.13 No.2

            Action recognition has been studied in computer vision field for years. We present an effective approach to recognize actions using a dimension reduction method, which is applied as a crucial step to reduce the dimensionality of feature descriptors after extracting features. We propose to use sparse matrix and randomized kd-tree to modify it and then propose modified Local Fisher Discriminant Analysis (mLFDA) method which greatly reduces the required memory and accelerate the standard Local Fisher Discriminant Analysis. For feature encoding, we propose a useful encoding method called mix encoding which combines Fisher vector encoding and locality-constrained linear coding to get the final video representations. In order to add more meaningful features to the process of action recognition, the convolutional neural network is utilized and combined with mix encoding to produce the deep network feature. Experimental results show that our algorithm is a competitive method on KTH dataset, HMDB51 dataset and UCF101 dataset when combining all these methods.

          • Research on the Business Model of E-commerce Platform based on Value Co-creation Theory

            Yan,Hou,Huafei,Chen,Shuling,Yang 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.3

            With the rapid development of social media and electronic commerce, the number of people using online shopping is increasing; this trend has promoted the emergence and development of social business. The value of social business is created by users and enterprises, so that value co-creation theory has great significance for the study of social business. In this paper, we analyze interactive process of value co-creation and study the influencing factors. Using empirical analysis, the result shows that website quality, reciprocity and altruism has a positive correlation with customer value creating behavior, however, incentive mechanism doesn't influence value co-creation behavior. On this basis, we put forward some concrete suggestions to the social business.

          • KCI등재후보

            Effect of Tissue Engineering Small Vessel Scaffolds in Experimental Animals

            Chen,Huayong,Bai,Shuling,Chen,Yingqing 한국조직공학과 재생의학회 2012 조직공학과 재생의학 Vol.9 No.3

            Acellular xenogeneic small vessel scaffolds preliminarily eliminate the xenogeneic antigen that could induce an immune rejection. We transplanted the Wistar rat caudal artery scaffolds into Japanese white rabbit ear central arteries, and observed the changes of blood flow and vessel wall. We acquired 30 caudal arteries from 15Wistar rats, some were directly assigned as caudal artery group, the others were disposed by 1% p-octyl polyethelene glycol phenyl ether, and were assigned as the group of tissue engineered small vessel scaffold. We collected 15 Japanese white rabbits, and utilized a pair of ear central arteries per rabbit as hosts. Through microscopic surgery, the proximal broken end of central artery was overlapped into the donor's proximal vessel lumen by sleeve anastomosis,while the distal broken end was sutured by classical end-to-end anastomosis. The maximum patency time of small vessel scaffold was 46 hours and 47 minutes, and which of caudal vessel was 14 hours. The poor blood flow primarily was occurred in distal broken end, while proximal end was connected in pedicle graft structure. On the 10th day,tunica intima fibers in vessel scaffold were still arranged in cylindrical conformation regularly without cell adherence. On the 100th day, tunica intima fibers were still preserved completely in proximal end. The results showed that xenogeneic acellular small vessel scaffold can be transplanted into the host, and the sleeve anastomosis was significantly superior to the classical end-to-end anastomosis.

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