检索结果-内蒙古大学图书馆

Admission control with Elastic QoS for Video on Demand systems

International Journal of Automation and computing 2012年第5期9卷 467-473页

作者： Fu-Shou Lin 1 Bao-Qun Yin 1,2 Jing Huang 1 Xu-Min Wu 1 1 key lab of Anhui Network Communication system and control, University of Science and Technology of China, Hefei 230027, China 2 National Network New Media engineering Research Center, Institute of Acoustics, Chinese Academy of Science, Beijing 100190, China 1. Key Lab of Anhui Network Communication System and Control University of Science and Technology of China Hefei 230027 China 2. National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Science Beijing 100190 China

In network service systems, satisfying quality of service (QoS) is one of the main objectives. Admission control and resource allocation strategy can be used to guarantee the QoS requirement. Based on partially observable Markov decision processes (POMDPs), this paper proposes a novel admission control model for video on demand (VOD) service systems with elastic QoS. Elastic QoS is also considered in resource allocation strategy. Policy gradient algorithm is often available to find the solution of POMDP problems, with a satisfactory convergence rate. Through numerical examples, it can be shown that the proposed admission control strategy has better performance than complete admission control strategy.

关键词： Partially observable Markov decision processes (POMDPs) admission control resource allocation elastic quality of service (QoS) policy gradient

来源：评论

学校读者我要写书评

暂无评论

I-V characteristics of the metal-semiconductor junction

I-V characteristics of the metal-semiconductor junction

引用

2012 International Conference on Computing, Measurement, control and Sensor Network, CMCSN 2012

作者： Ma, Wenzhe Zhang, Wendong Li, Pengwei Hu, Jie Li, Gang Sang, Shengbo MicroNano System Research Center Information Engineering College Taiyuan University of Technology Taiyuan Shanxi China Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China

ISBN: (纸本)9780769547381

The electrical characteristic test of nanowires is important in nano-materials research. The metal-semiconductor junction that is fabricated with semiconductor nanowire and metal probe in electrical test system has impact on the test result directly, therefore it's necessary to study I-V characteristics of the metal-semiconductor(M-S) junction. Si,ZnO,GaN have been selected from multiple semiconductor materials. When they connected with tungsten probe, all of them formed Schottky barriers, but the relationships between current and voltage of the junctions are distinct. In the thesis, I-V curves of these M-S junctions are compared, and the best electrical performance of M-S junction is selected. © 2012 IEEE.

关键词： Nanowires

来源：评论

学校读者我要写书评

暂无评论

The design of burglar alarm circuit based on the magnetic field sensor

The design of burglar alarm circuit based on the magnetic fi...

引用

2012 International Conference on Computing, Measurement, control and Sensor Network, CMCSN 2012

作者： Deng, Lili Sang, Shengbo Zhang, Wendong Li, Pengwei Hu, Jie Li, Gang Feng, Hui Tang, Xiaoliang MicroNano System Research Center Information Engineering College Taiyuan University of Technology Taiyuan Shanxi China Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China

ISBN: (纸本)9780769547381

This paper introduces a design method and a hardware circuit of burglar alarm circuit based on the magnetic field sensor, which can be used to achieve the protection of valuables. The circuit design is ingenious, and has the characteristics of simple structure, light weight, small size, timeliness, high sensitivity and low cost. It has been proved to have a stable and reliable performance by experiment. © 2012 IEEE.

关键词： Timing circuits

来源：评论

学校读者我要写书评

暂无评论

Decentralized control of heterogeneous multi-agents in collective circular motion

Decentralized control of heterogeneous multi-agents in colle...

引用

31st Chinese control Conference, CCC 2012

作者： Zhiyong, Chen Zhang, Hai-Tao School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Department of Control Science and Engineering State Key Lab of Digital Manufacturing Equipments and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9789881563811

It is an interesting topic to study decentralized control algorithms for a group of agents to achieve a class of collective circular motion, or called torus. An algorithm was proposed in [1] where no global beacon information is required, however, the agents are homogeneous. In particular, it was assumed that the agents have a common nominal rotation radius and share a common reference frame. In this paper, an improved algorithm is proposed on heterogeneous agents by removing the two assumptions. © 2012 Chinese Assoc of Automati.

关键词： Decentralized control

来源：评论

学校读者我要写书评

暂无评论

Post-processing algorithm based on total differential method for multi-axis machine tools with arbitrary configuration

引用

Jixie Gongcheng Xuebao/Journal of Mechanical engineering 2012年第13期48卷 121-126页

作者： Peng, Fangyu Ma, Jiyang Wang, Li Yan, Rong Li, Bin State Key Lab. of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

Due to existing post-processing algorithm, which is only suitable for a specific type of multi-axis NC machine tool, a generalized method that fits arbitrary configuration is presented. It derives a general kinematic model from multi-body kinematics, and describes the spatial relationship between adjacent CL-data as total differential. The complicated reverse kinematics problem is transformed into solving linear equations. The initial machine control data is solved with the combination of numerical method and total differential method to ensure solving accuracy of subsequent CL-data. In comparison with conventional methods, experiments on a specific machine tool show that the total differential method has attributes of being better generalized, more accurate, and with faster computing speed. © 2012 Journal of Mechanical engineering.

关键词： Machine tools

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional surface topography simulation of ultra- precision milling based on point cloud

引用

Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) 2012年第8期40卷 1-6页

作者： Peng, Fangyu Fang, Zhenglong Wu, Jing Yan, Rong State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China National Engineering Research Center for Numerical Control System Huazhong University of Science and Technology Wuhan 430074 China

A three-dimensional surface topography simulation algorithm for ultra-precision milling was proposed. In order to illustrate the formation of surface topography, blade point clouds which were consisted by a serial of blade points according to calculating the instantaneous locations of static discrete blade points in machining process, was introduced as the research object. Meanwhile the servo bounding boxes which were constructed by meshing simulation surface were utilized to selecting sampling points. The comparison between simulation results and measurement pictures shows that the algorithm can clearly illustrate the distribution of scallop in different directions, as well as the influence on the topography caused by initial cutter phrase. Hence, it provides a method to the research the surface topography composition in the range of ultra-precision milling machining.

关键词： Surface topography

来源：评论

学校读者我要写书评

暂无评论

A dynamic programming algorithm for QoS-aware replica placement in distributed caching systems

引用

Journal of Convergence Information Technology 2012年第12期7卷 226-234页

作者： Wang, Biyao Wang, Jinlin Liu, Xue The Key Lab of Network Communication System and Control The Chinese Academy of Sciences The Key Lab of Network Communication System and Control Anhui Department of Automation University of Science and Technology China National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Sciences China

The rapid growth of new information services, especially like new media services, providing content distribution to clients with good quality of service(QoS) while retaining efficient is a great challenge. This paper investigates the QoS-aware replica placement problem (QRPP) for distributed caching system. We propose a dynamic programming algorithm for the problem in general graph, it first ensures the QoS requirement is satisfied of each request, then places the replica along the request forward path to minimize the total cost. The simulation results show the dynamic programming algorithm can achive a good balance between the access latency and the requested availability. When the request is more concentrated, the dynamic programming algorithm can have better performance than the MODULO and LRU both in access latency and requested availability.

关键词： Dynamic programming

来源：评论

学校读者我要写书评

暂无评论

Analysis of the Effect of Idle Rollers on Tension Vibration in Discontinuous Web Transport systems

Analysis of the Effect of Idle Rollers on Tension Vibration ...

引用

2012 International Conference on Smart Technologies for Materials and Communication(ICSTMC 2012)

作者： Jiankui Chen Yongan Huang Zhouping Yin Department of Control Science and Engineering Huazhong University of Science and Technology State Key Lab of Digital Manufacturing Equipment & Technology Huazhong University of Science and Technology

Tension control and precise conveyance in web-handling machines are critical to ensure product quality. This paper is focused on analyzing the effect of idle rollers on flexible web tension vibration for discontinuous web transport systems. First, the simplified algebraic dynamical models of the inertia and friction are presented, which plays an important role for the design of idle rollers' layout systems. Second, the tension vibration test method and tension data collection scheme are introduced, respectively. Finally, based on the mathematical model and test strategies, an experiment platform is established. Several experiments have been performed to show idle rollers' effect on tension control and tension vibration in the discontinuous web transport system.

关键词： Tension control idle roller discontinuous winding tension vibration programmable multiple axis controller

来源：评论

学校读者我要写书评

暂无评论

Decentralized control of Heterogeneous Multi-agents in Collective Circular Motion

Decentralized Control of Heterogeneous Multi-agents in Colle...

引用

Chinese control Conference

作者： Zhiyong Chen Hai-Tao Zhang School of Electrical Engineering and Computer Science The University of Newcastle Department of Control Science and Engineering State Key Lab of Digital Manufacturing Equipments and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781467325813

关键词： Multi-agent systems Collective behavior Circular motion Torus Heterogeneous multi-agents toruses Torus Circular motion Multi-agent systems decentralised control Agents REFERENCE FRAMES Collective Behavior

来源：评论

学校读者我要写书评

暂无评论

Design of intelligent coal mine roof online monitoring system based on CAN bus

引用

Advances in Information Sciences and Service Sciences 2012年第21期4卷 540-547页

作者： Gao, Yan Jin, Baoquan College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan 030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

The design of intelligent multi-parameter real-time monitoring system for the security of coal mine roof is introduced aiming at the status of monitoring system for mine roadway roof safety and supporting. Using advanced field-bus CAN technology and Ethernet fiber transmission technology can not only display the measurement data on-site and alarm, but also transmit the measured data through the monitor network of mine to the main monitoring station on the ground and the remote monitoring center for analysis and processing, so that the monitor in command center on the ground can real-time and remotely monitoring the security status on the roof. The actual application showed that the system had the capability of high communication speed, long transmission distance, anti-electromagnetic interference, reliable transmission, and high real-time. The system can play an active role in early warning to avoid the occurrence of coal mine roof disasters.

关键词： Coal mines

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：