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A New Audio Event Detection Method by Using Contextual Information
Qi Hong-zhuo,Chen De-yun 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.3
This paper focuses on audio event detection in tennis match. A new audio event detection method is proposed my making use of contextual information. This method detects the sounds of ball hit and line judge’s shout by the grunts of players when they hit the ball. To model for audio events, the proposed method adopts unsupervised learning to use the information of grunts. Compared with current methods, the proposed method possesses two advantages. First, it does not need any labeled data which is appeal in real applications. Second, this method can reduce the mismatch between training and testing to further improve the performance. Experimental results show that the proposed method can improve the performance of audio event detection substantially.
Zhang, Feng-Jun,Zhang, Zhuo,Xie, Fa-Zhi,Xuan, Han,Xia, Hong-Chen,Zhu, Lei,Oh, Won-Chun The Korean Ceramic Society 2014 한국세라믹학회지 Vol.51 No.6
Magnetic-graphene nanosheets have been synthesized via a simple effective chemical precipitation method followed by heat treatment. The composite nanosheets are super paramagnetic at room temperature and can be separated by an external magnetic field. The prepared magnetic-graphene nanosheets were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and BET surface area analysis. The results demonstrated the successful attachment of iron oxide nanoparticles to graphene nanosheets. It was found that the attached nanoparticles were mainly $Fe_3O_4$. The magnetic-graphene nanosheets showed near complete methyl orange removal within 10 mintues and would be practically usable for methyl orange separation from water.
Feng-Jun Zhang,Zhuo Zhang,Han Xuan,Hong-Chen Xia,Lei Zhu,오원춘,Fazhi Xie 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
Magnetic-graphene nanosheets have been synthesized via a simple effective chemical precipitation method followed by heattreatment. The composite nanosheets are super paramagnetic at room temperature and can be separated by an external magneticfield. The prepared magnetic-graphene nanosheets were characterized by X-ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM), Raman spectroscopy, and BET surface area analysis. The resultsdemonstrated the successful attachment of iron oxide nanoparticles to graphene nanosheets. It was found that the attachednanoparticles were mainly Fe3O4. The magnetic-graphene nanosheets showed near complete methyl orange removal within 10mintues and would be practically usable for methyl orange separation from water.
Ru-Xiang Hua,Hong-Xuan Ma,Wei Zou,Wei Zhang,Zhuo Wang 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.2
Spraying trajectory planning is a key and challenging work for intelligent spraying robot. In order to effectively fulfill spraying on complex surfaces without CAD model, a novel spraying trajectory planning method based on segmentation and trajectory sequence optimization is proposed in this paper, which is mainly composed by three steps: surface segmentation, trajectories generation and trajectories connection. In surface segmentation, a method named regional growth with minimum curvature point (RGMCP) is proposed to segment a 3D entity into different subsurfaces by taking normals and curvatures into consideration simultaneously. In trajectories generation step, an intersection of plane and point cloud (IPPC) algorithm is used to generate the optimal spraying trajectory for each segmented subsurface. Finally, for trajectories connection, a sequence optimization algorithm based on swap-evolution particles (SOSP) is proposed to connect all the subsurface trajectories as a complete spraying one in an optimum manner by regarding it as a sequence optimization problem. The effectiveness of the proposed method is validated by simulation and practical experiment simultaneously. Comparatively, our method can improve the efficiency of a spray task with 367 trajectories and 627 s time-consuming to 215 trajectories and 413 s, while the coating thickness variances are lowered from 51.9 µm2 and 30.4 µm2 to 3.64 µm2 and 7.89 µm2 respectively, which shows that the proposed method is more effective and can keep better coating thickness uniformity.
Microstructure and Mechanical Properties of TA15 Alloy Produced by Electron Beam Melting
Jiangtao Ran,Fengchun Jiang,Zhuo Chen,Hong Zhao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
A series of TA15 specimens with different process parameters were built by electron beam melting in this paper to systematicallyinvestigate the relationship of material-process-microstructure-mechanical properties. A quantitative mathematicalmodel of yield strength and Vickers hardness with respect to α lath thickness was established. Microstructure analysis resultsshowed that the microstructure of TA15 titanium alloy were basketweave microstructure, lamellar microstructure and bimodalmicrostructure depending on process. In general, the yield strength, Vickers hardness and α plate thickness are correlated withthe Hall-Petch equation, but the mathematical model established in this paper has a better fitting effect. Process parametersaffect the mechanical properties of the TA15 titanium alloy by affecting α lath thickness, and speed factor has the greatestinfluence on α lath thickness. The tensile properties of TA15 titanium alloy are as well as, if not better than, that of TA15titanium alloys with tri-modal microstructure.
Xia, Fa-Da,Wang, Zhuo-Lu,Chen, Hong-Xi,Huang, Yun,Li, Jin-Dong,Wang, Zhi-Ming,Li, Xin-Ying Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.12
Purpose: To investigate IQGAP1 and IQGAP2 expression in hepatocellular carcinoma (HCC) and itsassociation with HCC clinicopathological characteristics and survival outcomes. Methods: IQGAP1 and IQGAP2 mRNA and protein were measured in HCC tissues, para-tumor tissues and normal tissues by RT-PCR and Western blotting. We further examined 150 HCC samples with adjacent para-tumor tissues and 11 normal specimens by immunohistochemistry to evaluate the correlation of IQGAP1 and IQGAP2 with clinicopathological features and prognosis. Results: IQGAP1 mRNA and protein were up-regulated while IQGAP2 mRNA and protein were down-regulated in human HCC tissues compared with para-tumor and normal liver tissues (p<0.05). IQGAP1 expression was higher in primary HCC (122/150, 81.3%) than matched adjacent tissues (30/150, 20%, p<0.001), whereas IQGAP2 was lower (31/150, 20.7% as compared to 112/150, 74.7%, P<0.001). Positive IQGAP1 expression correlated with larger tumor size (p=0.002), advanced TNM stage (p=0.002) and tumor differentiation (III and IV, p=0.034). Negative IQGAP2 expression was significantly associated with larger tumor size (p=0.009), multicentric tumor occurrence (p=0.01), advanced TNM stage (0.009) and tumor differentiation (III and IV, p=0.020). Survival analysis revealed that patients with either IQGAP1+ or IQGAP2-tumors had significantly reduced disease-free survival (p<0.001 and 0.006 respectively) and overall survival (p<0.001 for both). Multivariate analysis showed that IQGAP1/2 switch was an independent prognosis factor for disease-free survival (HR=2.824) and overall survival (HR=2.189). Conclusion: Positive IQGAP1 and negative IQGAP2 expression were closely correlated with tumor progression and could be used as adjunctive biomarkers to improve prognostication for HCC patients.
Rui Li,Xinjian Yuan,Ting Li,Miao Hong,Shiwei Tao,Zhuo Chen,Ge Wang 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.5
When using high energy shot peening (HESP) technology, the surface layer of the welded joints produced grain breakage and residual compressive stress. When the shot peening strength is the optimal parameter 0.10 MPa, the residual compressive stress reaches a maximum value of 74.02 MPa, dislocation density in welded joints increased significantly and the tensile shear strength of the joint was increased by 18.6% compared to the joint without HESP treatment (205 MPa), and the fracture position of the welded joint was located in the Al alloy base material, these were brought by fi ne grain strengthening and strain strengthening. When the shot peening strength was 0.05 MPa, the strength of the joint was also improved, but the fracture position of the joint was the same as that without HESP treatment, and they were all in the fusion zone. However, when the shot peening strength was further increased to 0.15 MPa, severe cracks appeared inside the joint, which deteriorates the strength of the Mg/steel joint.