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K-means Parallelization Algorithm Based on MapReduce
Shuguang Wang,Chao Jiang 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.8
Spatial Cluster analysis is another important technique in the field of spatial data mining, especially the K-Means spatial clustering method, which can deal with spatial objects with geographical location and attribute. However, with the development of the information society, the spatial data grows explosively, but the serial algorithm has low computing efficiency and is difficult to process massive spatial data. Aiming at spatial with a double meaning of location and attribute, the paper designed and implemented K-Means spatial clustering parallel algorithm on Hadoop. Using Yahoo Weibo user data is to do clustering analysis. Finally, the visualization of clustering results was implemented by Google Map.
Video Multiple Classification Algorithm Based on SVM
Chao Jiang,Shuguang Wang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.7
The performance of video automatic classification algorithm depends largely on the extraction of video features and selection of classification algorithm. From the perspective of video contents and video style type, the paper presents a new feature representation scheme, i.e. MPEG-7 visual description sub-combination model, a new method based on support vector machine (SVM) to solve problems with existing algorithms, by analyzing visual differences between five types of videos. Also we improve the classifier decision scheme and then propose the secondary prediction mechanism based on SVM 1-1 approach, improving the accuracy of SVM multi-classification method. The experimental results indicate that the proposed method manifests differences of different videos about feature selection, enhances the discrimination ability of videos pending for classification and increases the effectiveness of SVM multi-video classification.
Jinxin Jiang,Wei-Haur Lam,Yonggang Cui,Tianming Zhang,Chong Sun,Jianhua Guo,Yanbo Ma,Shuguang Wang,Gerard Hamill 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.3
The current research proposed the theoretical model for ship twin-propeller jet based on the axial momentum theory and Gaussian normal distribution. The twin-propeller jet model is compared to the more matured single propeller jet model with good agreement. Computational Fluid Dynamics (CFD) method is used to acquire the velocity distribution within the twin-propeller jet for understanding of flow characteristics and validation purposes. Efflux velocity is the maximum velocity within the entire jet with strong influences by the geometrical profiles of the blades. Twin-propeller jet model showed four-peaked profile at the initial plane downstream to the propeller compared to the two-peaked profile from a single-propeller. The four-peaked profile merges to be twopeaked velocity profile and then one-peaked profile due to the fluid mixing. Entrainment occurs between the ambient still water outside and the rotating flow within jet due to the high velocity gradient. The research proposes a twin-propeller jet theory with a serial of equations enabling the predictions of velocity magnitude within the jet.
Numerical Simulating Long-Distance Emergency Rescue System for Belt Fire in Coal Mine
Shao Hao,Jiang Shuguang,Wu Zhengyan,Zhang Weiqing,Wang Kai 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.12
The belt fire in coal mine has the characteristics of fast burning velocity, not easily extinguishing a fire and generating a great deal of poisonous and toxic gas. Once the belt fire happens, it will result in a large number of casualties and enormous property loss, which is one of the greatest disasters that influence on the safety production in coal mine. To reduce the number of casualties and property loss caused by belt fire, the long-distance emergency rescue system for belt fire is proposed, and used to directly import the poisonous and toxic gas produced by belt lane into return airway in order to guarantee the safety of staffs working in mining area. In order to research on how the efficiency of using the system and what the system has additional impact on the ventilation system, the present study applies the approach of numerical stimulation to establish the two-dimensional model of ventilation system. After the belt fire happens, and then this paper researches on the flow laws of poisonous and toxic gas, and explores the long-distance emergency rescue system for belt fire influencing on the ventilation system and controlling the poisonous and toxic gas. The current study yields the conclusions as follows: (1) how poisonous and toxic gas produced by belt fire in different ventilation models spreads and moves in the roadway; and (2) how the long-distance emergency rescue system for belt fire influences on the ventilation system. This research has certain instructive significance and reference value for improving the level of emergency rescue about the belt fire, and reducing the number of casualties and property loss caused by belt fire.
Xuefei Zhao,Han Jiang,Shuguang Wang 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.29 No.2
This paper provides a simple numerical method to determine the optimal parameters of tuned mass damper (TMD) and viscoelastic dampers (VEDs) in frame structure for wind vibration control considering the soil-structure interation (SSI) effect in frequency domain. Firstly, the numerical model of frame structure equipped with TMD and VEDs considering SSI effect is established in frequency domain. Then, the genetic algorithm (GA) is applied to obtain the optimal parameters of VEDs and TMD. The optimization process is demonstrated by a 20-storey frame structure supported by pile group for different soil conditions. Two wind resistant systems are considered in the analysis, the Structure-TMD system and the Structure-TMD-VEDs system. The example proves that this method can quickly determine the optimal parameters of energy dissipation devices compared with the traditional finite element method, thus is practically valuable.
Epithelial-Mesenchymal Transitions of Bile Duct Epithelial Cells in Primary Hepatolithiasis
Lijin Zhao,Rigao Yang,Long Cheng,Maijian Wang,Yan Jiang,Shuguang Wang 대한의학회 2010 Journal of Korean medical science Vol.25 No.7
The purpose of this study was to explore the role of epithelial-mesenchymal transition in the pathogenesis of hepatolithiasis. Thirty-one patients with primary hepatolithiasis were enrolled in this study. Expressions of E-cadherin, α-catenin, α-SMA, vimentin, S100A4,TGF-β1 and P-smad2/3 in hepatolithiasis bile duct epithelial cells were examined by immunohistochemistry staining. The results showed that the expressions of the epithelial markers E-cadherin and α-catenin were frequently lost in hepatolithiasis (32.3% and 25.9%of cases, respectively), while the mesenchymal markers vimentin, α-SMA and S100A4 were found to be present in hepatolithiasis (35.5%, 29.0%, and 32.3% of cases, respectively). The increased mesenchymal marker expression was correlated with decreased epithelial marker expression. The expressions of TGF-β1 and P-smad2/3 in hepatolithiasis were correlated with the expression of S100A4. These data indicate that TGF-β1-mediated epithelialmesenchymal transition might be involved in the formation of hepatolithiasis.