Advanced Materials Research Vols. 850-851

Abstract: Recently, a new model for cognitive radio networks appears, in which a cognitive user (CU) can relay the primary data stream to improve the performance of the primary user s communication. Traditionally, the transmitter of the cognitive users will send data to the receiver of the cognitive users and relay the data sent from the primary user (PU) in different time slots. However, Multiple Input Multiple Output (MIMO) provides a remarkable increase in the spectral efficiency, which can transmit multiple independent data streams in a time slot with MIMO antenna. Based on the MIMO technique, we propose a novel framework, in which the cognitive user near by the primary user is equipped with MIMO antenna. In this paper, we search for the maximum sum-rate of the cognitive user, limiting the interference to the primary users. Simulation results show that the proposed method can really improve the performance of the cognitive relay networks.

Abstract: In order to improve greenhouse pepper production and efficiency, improve economic efficiency of enterprises, using the Internet of things to JN5148 core, this thesis describes a pepper cultivation environment monitoring system. The system can collect a variety of environmental parameters in the process of pepper cultivation, real-time and remote online monitoring actuators in greenhouse, and it isnt restricted by areas. The system is flexible, easy to use, conforms to the agricultural development trend characterized by intelligence, information and networking. And it promotes pepper production to large-scale and intensive production.

Abstract: The key issue of feedback torque calculation in BLDCM-DTC system is how to get the accurate estimation of back-emf. The influences form the deviation of resistance and inductance on traditional back-emf sliding mode observer (SMO) and relevant torque observation results are analyzed. To advance the accuracy of the torque estimation, an adaptive sliding mode observer is designed to estimate the back-emf of the BLDCM and then get torque estimation from the back-emf estimation. The proposed sliding mode observer can also implement the online identification of the stator resistance and inductance simultaneously. Simulation results demonstrate the proposed method is valid and effective.

Abstract: This paper introduces a kind of physiological signal detection instrument based on FPGA. The system uses FPGA as the core, SC0073 as the sensor, the signal amplification, filtering, A/D conversion, and finally the signal does a digital signal processing in FPGA , and under the control of FPGA, displayed on the LCD screen in time. Results show that the system is stable and have a good performance.

Abstract: At present, the website construction has become one of the necessary works of any industry. However, among hundreds of millions of websites, interface design is very convenient for people to use, and a small number of fast. The reason, including web interface design, web technology adoption, etc. will influence people to visit a website. Among these reasons, the interactive design of website interfaces and become the primary problem of experience that people visit the website. To address this problem, the current website interface and interactive design were discussed in this article, and try to propose improved method of most common small and medium-sized websites.

Abstract: For irrigated areas still follow the traditional irrigation, causing serious water wastage. In this paper, chip CC2530 Zig Bee wireless network as the core, development and design coordinator nodes, routing nodes and devices terminal node, complete the irrigated areas of intelligent water-saving irrigation control system for wireless sensor networks networking structures. Equipment terminal node is responsible for collecting soil moisture data, the data is sent directly through the route or to the coordinator node, the coordinator node for data aggregation and passed to the intelligent controller, through the intelligent controller to make an accurate judgment, the implementation of efficient water-saving intelligent irrigation.

Abstract: This paper proposes a distributed algorithm to construct a 2-connected 2-dominating set. The main ingredient of this algorithm is that the nodes in the loop are 2-vertex connected. It starts from any node, and forms a localized loop made by dominating nodes. The nodes in the loop are 2-vertex connected. Basing on this loop, the algorithm continue to construct other loops formed by dominating nodes until the nodes out loops are 2-dominated.

Abstract: In response to the Internet users are about the same theme of mass information effectively filter and extraction, this paper proposes a document based on particle size of the news MGNF fusion algorithm, particle size document means that face now the newest microblog and short documents and traditional news dissemination documents, both document length although different, but as based on the calculation of grassroots journalism and communication mode. Through mining the different particle size of the document different views, we can find out the potential to be found for the information. The experimental results verify the effectiveness of the proposed algorithm.

Abstract: Based on the traditional campus public address system is introduced in the network technology, this paper discusses the network public address system composition and function of main equipment, the implementation partition on demand, partition paging remote monitoring and remote diagnosis and remote software upgrade

Abstract: The paper introduces a kind of inspection robot for high-voltage transmission lines from two parts:Mechanical structure and control system. Three arms is adopted in the mechanical structure, while the control system used a hierarchical modular control scheme is designed to a kind of three-layer control structure including the ground monitoring layer, the task decision layer and the action execution layer. The PC/104 and AT89C51 is used for the main control computer, and the MX-servo is used for the power drive components. Except for describing the robots working process of crossing obstacles in detail, the paper also introduces the responsibilities, hardware components, software design process of the control system. From the simulation experiment on motion control system using Matlab/Simulink, we can conclude that the motion control system of the robot has high-stability and reliability and meet the design requirements.