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Research on load balancing strategy based on middleware

ICIC Express Letters 2014年第9期8卷 2655-2661页

作者： Gu, Xiaoying Liu, Yongshan Man, Yubao Department of Information Science and Engineering Qinhuangdao 066004 China The Key Lab. for Computer Virtual Tech. and System Integration of Hebei Province Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China Data Industry Research Lab Qinhuangdao 066004 China

According to the former research achievements about load balancing strategy, considering the load distribution, the load condition of service node and the number of user connections, we propose a load balancing strategy based on middleware. According to the cluster service load and the number of user connections, the requests from user will be reasonably allocated to each service node by using middleware technology, then service node and requested user establish a temporary connection, after all the requests of this user are processed by this node. Experiments show that, this strategy reduces the number of requests for allocation, improves the resource utilization rate of cluster system and load balancing degree, and effectively suppresses the load jitter of system. © 2014 ISSN 1881-803X.

关键词： Middleware

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Rain scenes rendering algorithm combining metaball with mass-spring surface

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and technology Edition) 2013年第SUPPL.1期43卷 230-234页

作者： Lyu, Meng-Ya Zheng, Xuan Tang, Yong College of Information Science and Engineering Yanshan University Qinhuangdao 066004 China The Key Laboratory for Computer Virtual Technology and System Integration of HeBei Province Qinhuangdao 066004 China

To solve the problems such as unreal effects, incomplete details in the rain scene, an algorithm to simulate water surface after rain hitting by combining Meatball with mass-spring water surface was presented. First, the raindrops model was estabished with particle system combining textures, and the water surface model was established with the mass-spring model. Secondly, the algorithm animated half globular bubbles after rain hitting with Meatball. Thirdly, water splash was simulated by means of the particle system and a gradual thinning and syncretizing technique. Finally, with the help of Cg language, the reflection and the refraction effect on the water surface, globular bubbles and water splash were simulated. The experiment shows that this approach can be used to simulate rain scenes efficiently and realistically.

关键词： Rain

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A Recurrence method of attribute reduction based on rough set

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ICIC Express Letters 2013年第3 B期7卷 1025-1030页

作者： Zhang, Tao Lu, Jing Chen, Nan Gao, Zhi College of Information Engineering Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China College of Foreign Languages Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China Institute of Electrical Engineering Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China

According to the classical rough set, the attribute reduction set may be far from satisfactory due to the non-existence of core in the attribute reduction process of decision table. Aiming at this issue, this paper puts forward a recurrence method of attribute reduction;first find out the starting attributes with the highest division as the basic one, and then add the remaining attributes gradually to refine the undivided equivalence class until the non-existence of the samples which must be separated. The paper theoretically proved the relation between the traditional method and recurrence method of attribute reduction on the existence of core. The reliability of the new method was analyzed and illustrated by experiments. © 2013 ICIC International.

关键词： Decision tables

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Correlation technology of suturing procedure in virtual surgery

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and technology Edition) 2013年第SUPPL.1期43卷 16-20页

作者： Lyu, Meng-Ya Han, Yu-Fang Tang, Yong College of Information Science and Engineering Yanshan University Qinhuangdao 066004 China Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Yanshan University Qinhuangdao 066004 China

Aiming at the difficulty of achieving interactive simulation between soft tissue and suture, a method to simulate suturing procedure in virtual surgery was proposed. Firstly, mass-spring model was used as the physical model for soft tissue. In order to perform the relative motion between two masses of soft tissue realistically, an internal friction coefficient was introduced first. Secondly, the interaction of suture and soft tissue was aralyzed. A simple linear mass-spring model with following the leader algorithm was used to model the suture. A stress aralysis was carried out, when the suture touch the soft tissue, so the interaction process was close to physical reality. The movement of the whole suture computed by following the leader algorithm gave good performance in suture's rigidity characteristics. Finally, the interaction of the two deformable objects in a continuous pattern suture was considered, for each node of the soft tissue model, the node that attached to it was stored. This information can be used to compute the soft tissue deformation well. Experiment shows that it is realistical to simulate the soft tissue deformation and suture. meanwhile, the simulation is in real time.

关键词： Deformation

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Deterministic Pilot Design for MIMO OFDM system Based on Compressed Sensing

Deterministic Pilot Design for MIMO OFDM System Based on Com...

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2012 IEEE 14th International Conference on Communication technology

作者： Nan Jing Weihong Bi Lin Wang School of Information Science and Engineering Yanshan University The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province School of Information Science and Engineering Yanshan University The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province

ISBN: (纸本)9781467321006

We consider the problem of pilot design for sparse multipath channel estimation in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system in this *** order to reconstruct MIMO sparse channel,the prevalent compressed sensing (CS) theory is *** to random pilot construction,a deterministic pilot de- sign method is exploited to form the measurement matrix by deterministically extracting some rows of Fourier matrix that satisfies Restricted Isometry Property (RIP).Two families of continuous functions,namely f1 -SL0 and f 2-SL0,are investi- gated in this paper to approximate A 0norm for MIMO sparse channel *** results suggest that the de- terministic pilot design scheme performs as well as the random one at both low and high signal noise ratio (SNR).Moreover,f1 - SL0 and f 2-SL0 outperform A 1-dantzig algorithm with faster running time and better anti-noisy performance.

关键词： sparse channel estimation,deterministic pilot design,compressed sensing,MIMO OFDM

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AR Mechanical-Guiding Assembly system

AR Mechanical-Guiding Assembly System

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International Conference on virtual Reality and Visualization (ICVRV)

作者： Yuhan Liu Liguo Yang Yong Tang Jiangtao Li Chuanning Tang Jiangkai Jia Yanshan University The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Qinhuangdao China Yanshan University Level 16 College of Information Science and Engineering Qinhuangdao China Yanshan University Level 15 College of Information Science and Engineering Qinhuangdao China yanshan university College of Information Science and Engineering Qinhuangdao China

ISBN: (纸本)9781538684986;9781538684979

Guiding assembly system based on AR is to apply the technol-ogy of Augmented Reality to guide mechanical assembly op-eration and teach or train freshmen. By the means of adapting AR glasses(HoloLens, Magic Leap One etc.), we use virtual information to guide operating real mechanic. AR operation can achieve better effect than traditional reality training, and make industrial assembly process easier for costumers to un-derstand. It can also decrease losses caused by operational error, therefore increases efficiency safety and productivity.

关键词： Conferences virtual reality Visualization

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Kinematic Characteristics and Dynamics Analysis of the Tetrahedral Deployable Mechanism Based on the Screw Theory

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Jiqiren/Robot 2020年第1期42卷 21-28and38页

作者： Han, Bo Han, Yuanyuan Xu, Yundou Zheng, Dong Yao, Jiantao Zhao, Yongsheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao066004 China Department of Mathematics and Computer Science Hengshui University Hengshui053000 China

In order to solve the modeling and analysis problems of the kinematics and dynamics of the spaceborne tetrahedral space deployable antenna, a kinematics and dynamics characteristics analysis method based on screw theory is established. Firstly, configuration and geometric characteristics of the 3RR-3RRR tetrahedral deployable mechanism are analyzed, its screw constrained topology diagram is obtained based on screw theory, and its degree of freedom (DOF) is calculated to be only one. Then, the kinematics analysis of the mechanism is conducted, the velocities of the components are obtained through the combinatorial operation of kinematic twists, and the Jacobian matrix of this mechanism is also obtained. The 6-dimensional acceleration of each component is expressed by the screw derivative, and the angular accelerations and centroid linear accelerations of the node disks and rods are deduced. Finally, the dynamic equation is established based on the Newton-Euler equation and the principle of virtual work, and the numerical calculation and simulation verification are carried out. The simulation results are completely consistent with the numerical results, which verifies the correctness of the kinematics and dynamics characteristics analysis method based on screw theory. Every parameter has clear physical meanings in the analysis based on the proposed method, and the analysis process is easy to program due to its stylization and is suitable for the analysis of such spatial deployable mechanisms. © 2020, Science Press. All right reserved.

关键词： Screws

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Reinforced MOOCs Concept Recommendation in Heterogeneous Information Networks

arXiv

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arXiv 2022年

作者： Gong, Jibing Wan, Yao Liu, Ye Li, Xuewen Zhao, Yi Wang, Cheng Lin, Yuting Fang, Xiaohan Feng, Wenzheng Zhang, Jingyi Tang, Jie School of Information Science and Engineering The Key Lab for Computer Virtual Technology and System Integration The Key Laboratory for Software Engineering of Hebei Province Yanshan University No. 438 West Hebei Avenue Hebei Qinhuangdao066004 China School of Computer Science and Technology Huazhong University of Science and Technology Luoyu Road 1037 Hubei Wuhan430074 China Salesforce Research 556 Xixi Road Chicago United States School of Cyber Science and Technology Beihang University 37 Xueyuan Road Beijing100191 China Department of Computer Science Tsinghua University Beijing100084 China

Massive open online courses (MOOCs), which offer open access and widespread interactive participation through the internet, are quickly becoming the preferred method for online and remote learning. Several MOOC platforms offer the service of course recommendation to users, to improve the learning experience of users. Despite the usefulness of this service, we consider that recommending courses to users directly may neglect their varying degrees of expertise. To mitigate this gap, we examine an interesting problem © 2022, CC BY.

关键词： Information services

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Correction: Enumerating all multi-constrained s–t paths on temporal graph

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Knowledge and Information systems 2024年第5期66卷 3157-3157页

作者： Jin, Yue Chen, Zijun Liu, Wenyuan School of Information Science and Engineering Yanshan University Qinhuangdao China The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Qinhuangdao China

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Research on the Influence of Improved K-shell Algorithm on Commodity Profit

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Journal of Physics: Conference Series 2020年第1期1631卷

作者： Jing Chen Jincheng Huang College of Information Science and Engineering Yanshan University Qinhuangdao 066004 China Key Laboratory for Computer Virtual Technology and system Integration of Hebei Province Qinhuangdao 066004 China Software Engineering Laboratory in Hebei Province Qinhuangdao 066004 China

In order to maximize the influence of commodity profits in e-commerce platforms, designing and improving the K-shell algorithm to select the more influential seed node sets in this paper. The new algorithm improves the number of active nodes by setting node threshold and edge weight attributes. To obtain more commodity profits, a strategy IRDSN (Strategy for Improving Repeat Degree of Seed Nodes) is proposed to select initial seed nodes and improve the repeat degree of seed nodes. The profit maximization based on linear threshold model is realized by setting different propagation modes. The improved algorithm and strategy IRDSN are analysed and verified in real data set and e-commerce platform. The results show that the algorithm effectively improves the profit of commodities.

关键词：

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