Current Wireless Capsule Endoscopic systems (WCE) provide only diagnostic tools, but in the future, advanced functionalities such as controllable drug delivery could be available for clinicians. This paper proposes a ...
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A supertwisting sliding mode repetitive control method is proposed in this paper. It mainly focus on how to improve the system performance of supertwisting sliding mode control under periodic disturbance. By utilizing...
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This paper introduces a kind of zero energy consumption LED intelligent lighting system based on the technology of PoE. The system is a new kind of energy-saving innovative LED intelligent lighting control system base...
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This paper introduces a kind of zero energy consumption LED intelligent lighting system based on the technology of PoE. The system is a new kind of energy-saving innovative LED intelligent lighting control system based on PoE technology, and the only power source is solor energy. It transfers DC power and data on Ethernet at the same time, reduces the data network failure caused by the power adapter failure and promotes the application of the low power network equipment. By sensing the human activity in the current room and lighting intensity, the system determines the indoor lighting requirements automatically to achieve the intelligent control of LED lighting. This paper describes the system architecture based on mesh topology structure, presents the hardware circuit of the key equipment in the system, analyses the experimental process and gives the experimental results. This design enbodies the zero energy and intelligent lighting.
A scheme of digital inverter power supply system is given in this paper. The system input 36VDC, through the Boost circuit, the single-phase inverter turns DC into high frequency alternating current, then the high fre...
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Aiming at the problem of toxic gas leakage in petrochemical plant, a monitoring and alarming system for toxic gas leakage based on wireless sensor network is designed. The system includes four parts: terminal node, co...
Aiming at the problem of toxic gas leakage in petrochemical plant, a monitoring and alarming system for toxic gas leakage based on wireless sensor network is designed. The system includes four parts: terminal node, coordinator, GSM module and PC host computer. Among them, the wireless sensor network utilizes CC2530 as the main control chip, and realizes the transceiver of data between the coordinator node and the site terminal node based on the ZigBee protocol stack. If the coordinator node receives the concentration of toxic gases over the alert value, will drive the GSM module to send alarm information to the staff, at the same time the PC Kingview monitoring platform for the real-time display of the concentration of toxic gases, the system makes full use of the serial communication technology to realize the communication between the coordinator node, PC and GSM module;This paper introduces the system from four aspects: the overall design scheme, the hardware design of the system, the software design of the system and the performance test of the system. It is proved by experiment that the monitoring alarm system has the advantages of zero wiring, sensitive alarm, low power consumption and low cost.
MySQL database has been widely used by many large, medium and small enterprises with its open source, lightweight and multi thread, support high concurrency. In the face of high concurrency access to large amounts of ...
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MySQL database has been widely used by many large, medium and small enterprises with its open source, lightweight and multi thread, support high concurrency. In the face of high concurrency access to large amounts of data in the network system, the overall design of the database plays an important role in determining system performance. How to optimize the database so that it does not affect the overall performance of the server system during data access becomes a top priority. Based on this situation, this thesis introduces how to optimize the design of MySQL database on large data volume and high concurrency issues. Starting from the choice of different storage engines, through a lot of experiments, verify and analyze different storage engines and caching technologies to solve the database query and Insert equal amount of concurrent execution efficiency.
As Plug-in hybrid electric vehicles (PHEVs), dips usually occur on the bus because multiple PHEVs are connected to the same bus simultaneously. In view of the flaws of the existing traditional compensators and their e...
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As Plug-in hybrid electric vehicles (PHEVs), dips usually occur on the bus because multiple PHEVs are connected to the same bus simultaneously. In view of the flaws of the existing traditional compensators and their extra cost, the grid -side reactive power compensation by the chargers of PHEVs during charging is expected to address this issue. To provide such compensation during charging, it is necessary that PHEVs incorporate bidirectional chargers. Among different types of bidirectional chargers, the DC voltage controller is unable to compensate voltage. Alternatively, the chargers with active power controllers regulate active power as well as reactive power independently, which is effective and convenient. In this paper, we propose a PR control strategy for the PHEV s chargers to tune reactive power online and to increase power factor. The simulation examples are given to verify the effectiveness of the proposed strategy.
The electric vehicle has brought fluctuation to the power system. The wide use of electric vehicles(EVs) has exacerbated this challenge. Firstly, the mathematical model of electric vehicles under random charging mode ...
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The electric vehicle has brought fluctuation to the power system. The wide use of electric vehicles(EVs) has exacerbated this challenge. Firstly, the mathematical model of electric vehicles under random charging mode is given. Secondly, the power electronics charger topology is introduced. This paper analyzed the changes of the power system reliability when the proportion of electric vehicles increased, which shows the increase of electric vehicles under random charging mode poses a great threat to the reliability.
Genetic algorithms (GA) and ant colony algorithm (ACO) are computational models that simulate the process of biological evolution and are widely applied to problems related to path planning. This paper proposes a path...
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In order to help stroke patients to go on rehabilitation training, a new type of exoskeleton upper limb rehabilitation robot based on biomechanics has been designed in this paper, and speech control has been implement...
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