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Gang Chen,Yu Jin,Jing Wang,Cheng Zhang,Qiang Chen,Hongming Zhang,Xingjian Zhao,Zhiyong Li,Changhai Xie,Zhiming Du 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
Isothermal compression tests were carried out to study the hot deformation behavior of T2 copper under various conditions. The deformation parameters, such as temperature and strain rate, have strong influence on flow stress and microstructureevolution of the alloy. A unified dislocation density-based model considering dynamic recovery and recrystallization wasestablished. And material parameters of the developed model were optimized by genetic algorithm. Comparisons betweenthe experimental and model data demonstrates that the developed model can precisely describe the flow behavior at quitewide range of deformation conditions. Meanwhile, the designed iterative procedure allows the model to be applied in timevariantdeformation conditions. Processing map and microstructure examination were constructed to optimize the processingwindow of the studied alloy. According to the processing maps, flow instability mainly appeared at low temperatures of500–650 °C and strain rates higher than 0.1 s−1. The optimum deformation parameters of T2 copper was concluded as thetemperature range of 700–800 °C and the strain rate of 0.1–1 s−1.
Research on Tactical Mode Analysis of Sports Video
Gang Liu,Yang Wang,Jing-meng Sun 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.12
A new tactic analysis of broadcast sports video is proposed based on player trajectory information. Tactic analysis of sports video aims to recognize and discover tactic modes and match strategies that teams and personal players used in the games. Based on players and ball trajectory. First presents an interactive relationship analysis of temporal and spatial algorithm based on time fragment slice. According to the speed and distance of trajectory shape and the distance measurement and each trajectory in time fragment, to use graphical model was constructed to express tactical video game sports event. Through the analysis of each component fragment of interaction trajectory, the offensive incidents of tactical mode carried out hierarchical recognition of coarse to fine in football game video. In the coarse recognition process, the interaction mode is divided into a coordinated attack and personal attack. In fine recognition further, the coordinated attack mode is divided into interception attack and no interception attack. The personal attack mode is divided into direct attack and the dribbling-attack.
Establishment and Clinical Application of an Electronic Database for Breast Cancer in China
Lv, Yong-Gang,Huang, Mei-Ling,Xiao, Jing-Jing,Ling, Rui Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2
Purpose: To establish a database for breast cancer patients to save and manage clinical data and to preliminarily investigate its clinical application. Materials and Methods: Information on breast cancer patients hospitalized in our department from 2008.01 to 2013.01 were input into our breast cancer management system. SPSS 16.0 software was used as a convenient reference to evaluate the accuracy of the newly built database. Results: A database of 2403 breast cancer patients was successfully established. Information in the database clearly displayed capabilities of storage, addition, retrieval, statistical analysis and other functions. As the continuously updated database showed, the distribution of age, sex, nationality, allergy history, pausimenia and marriage of patients was identical to that achieved by SPSS analysis, indicating reliable and accurate data analysis. Conclusions: The described database is easy and convenient to operate and manage, and should prove suitable for application in clinical research and treatment.
A Clustering Sleep Scheduling Mechanism Based on Sentinel Nodes Monitor for WSN
Zhan-Yang Xu,Song-Gang Zhao,Zheng-Jun Jing 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.1
This paper proposes a clustering sleep scheduling mechanism based on sentinel nodes monitoring for WSN. The mechanism combines the network clustering strategy with the node dormancy strategy, and improves the method of selecting the candidate cluster heads randomly in Energy-Efficient Unequal Clustering (EEUC) algorithm. The conception of sentinel node is introduced based on EEUC, and the neighbor node set of sentinel node will be dormant when the sentinel node’s data change rate is lower than the setting threshold. Simulation results show that this mechanism can effectively balance the energy consumption of the entire network, and significantly extend the network lifetime.
Sensitivity analysis and kinematic calibration of 3-UCR symmetrical parallel robot leg
Gang Cheng,Shi-Rong Ge,Jing-Li Yu 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.7
Based on the complete differential-coefficient theory, the model of the pose errors expressed by the Rodrigues Parameters was established. By normalizing all error sources, the statistical model of sensitivity coefficients was obtained. Considering the sensitivity percentages,a kinematic calibration model with the successive approximation algorithm was achieved. The simulation shows that the algorithm is effective to study the calibration question and has concrete directivity, reducing the kinematic errors with high sensitivity percentage when optimizing iteratively.
Jing Shan,Yun-Gang Wang,Yu Wang,Hui-Min Wang,Yu Han 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.3
Electron transport through a parallel double-quantum-dot structure is theoretically studied withone dot in the Kondo region and the other one in the region of local Rashba interaction. Thecoupling between the Kondo dot and the electron reservoirs is found to offer a reference channel forelectron travels, and the connection of the Rashba dot and the leads is found to afford a resonantchannel. The interplay of these two mechanisms gives rise to the Fano effect, which also depends onthe adjustment of the Rashba field. We then conclude that in this structure, the Fano interferenceis more robust because it causes a quenching of the Kondo resonance. In the presence of a localmagnetic flux, the quenched Kondo resonance becomes determined by the electron spin, which ishelpful for spin manipulation.
Workspace analysis of 3-CPS parallel micro-manipulator for mirror active adjusting platform
Gang Cheng,Bing-jing Qiu,De-hua Yang,Hou-guang Liu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.12
In order to adjust telescope mirrors with high precision, a 3 cylindrical-prismatic-spherical (CPS) parallel micro-manipulator with 6 degrees-of-freedom (DOF) and partial decoupling is proposed. Structure characteristics of the micro-manipulator were analyzed and the kinematic equations were derived based on Euler method. To avoid tedious derivation, Jacobian matrix with screw theory representing the input and output relation of micro-manipulator is established by using velocity influence coefficient method. Combining topological structure characteristics of the 3-CPS parallel micro-manipulator, the solving procedures of workspace are obtained. Moreover, the position workspace with a given orientation and the orientation workspace with a given translation position are constructed by numerical simulations. The workspace range is chosen as the optimization goal of structure parameters, and the circumcircle radius ratio of base and moving platform and the lengths of each sub-link are optimized. The maximum condition number and the minimum singular value are chosen as the precision indexes to analyze the precision performance of the workspace. Then, the properties of the position workspaces with various orientations and the orientation workspaces with various positions are simulated numerically, and the simulation results prove that the 3-CPS parallel micro-manipulator has an ability to achieve high precision operations. This research provides a workspace modeling and optimization method for the practical application in telescope mirror adjustment or other fields requiring high precision.