In order to find an effective secret key generation scheme in wireless networks, many based on received signal strength methods have been proposed. However, the secret bit rates of existing schemes are relatively low. To resolve the problem of low generation rate, a vector quantization scheme is proposed...

In modern power grid, especially with the development of ultra high voltage (UHV) and AC-DC hybrid power grid, the scale and complexity of power transmission network increase a lot. System operators need to quickly grasp real-time operation situation and make decision to ensure the security and economics...

Rational optimization of the energy storage system can be configured to stabilize power fluctuations of wind and solar power generation systems. The use of batteries and complementary nature of ultra-capacitors, combined with real-time scheduling grid we proposed a method to improve the overall economics...

Winds forecast is of great significance for operating a wind farm and power systems. The accurately predict wind speed can effectively reduce the adverse impact of wind farms on the power system, while increase the wind farm in the electricity market competitiveness. This paper studied time series and...

Overhead icing transmission lines face great danger of stable operation. Based on the existing transmission line monitoring power, susceptible to electromagnetic interference and other shortcomings and Fiber Bragg Grating (FBG) sensor have the advantages of anti-electromagnetic interference, high sensitivity,...

In the modern information and network society, the data security is very important to our daily lives. The data encryption system can help us to protect the security of personal information. This paper mainly introduces the hardware and software design of the lower computer of data encryption system,...

Low cost commercially available Fresnel lens has been investigated as a potential candidate for portable concentrated solar cell application. A numerical model has been developed to simulate the selected Fresnel lens and its spot size, energy distribution, transmission spectrum and optical efficiency...

In the case of total internal reflection, the electromagnetic incident waves will be reflected back to the original medium. Whereas, based on the theory of electromagnetic fields, the incident waves do not wholly go back to the original medium, but generates refracted waves in the second medium, which...

Optical fiber sensing and optical fiber communication has a lot of similarities, and they are based on the basic properties of the fiber and advantages. The most distinguishing feature of optical fiber used for communication is tempting bandwidth, and used for sensing and testing tend to focus on a point...

A new monobus temperature and humidity sensor DHT11 has the advantages of small size, simple interface, high speed response, cost effective characteristics and so on. This paper briefly introduces the concept of Monobus, and expounds the basic principle and the control use of DHT11 . The many advantages...

LED display design hardware consists of STC89C52 smallest single-chip system, 32 × 32 dot matrix color display arrays, light pen, buttons, LCD display and other components. Color dot matrix red LED is always working in dimly lit scan status, lit STC89C52 microcontroller use homemade light pen infrared...

This article designed and realized a new type air-to-ground power grid’s hot spots’ monitoring and control system, to solve current problems like weak relevance between hot spots in power grid, delay in finding abnormal hot spots, etc. The system is made of long-distance temperature control and monitoring...

With the continuous development of network technology and the addition of network size, speed and complexity, the importance of network management is also increasing. The network management is the process to control a complex computer network so that it has the highest efficiency and productivity. According...

A number of popular communication traffic control protocols including virtual local area network and GMRP are applied in the new generation Smart Substation internal communication network. This paper presents a black-box testing method which does not rely on specific network configuration profile that...

The three layer equipment of IEC61850-compliant Smart Substation connecting directly to the Ethernet for the benefit of information transmission and sharing. However, it also brings certain information security risks. This paper proposes evolution ring based message security control scheme, which uses...

This paper presents a hardware implementation of rate control system with scene change detection for constant bit rate traffic of Motion JPEG2000. The input frames are divided into groups, each group contains one key frame, and a frame which originally is not a key frame of a group is changed to a key...

Third harmonic is usually combined with the standard sinusoidal signal to increase the DC voltage utilization within the Sinusoidal Pulse Width Modulation (SPWM) based inventers. The inverter of SPWM with 3rd keystone waveform was analyzed and the one with which to get the best DC voltage utilization...

In this paper, we propose a parallel HEVC encoder scheme based on multi-core platform, which provides maximized parallel scalability by exploiting two-level parallelism, namely, the frame level parallelism and the CTB level parallelism. Inspired by the intra-CTB row level parallelism of WPP in HEVC,...

To solve the conflict between the radar range and distance resolution effectively, this paper design and realize a method of pulse compression of radar system. Firstly, the paper describes the working principle of pulse compression. Then a method of pulse compression simulation is designed based on chirp...

The paper designs a new kind of laser marking system which is based on embedded microprocessor with several functions like continuing from the breakpoint, starting from any set point, marking on the curved surface, displaying the trace in real time and so on. The new kind of laser marking system is composed...

Grid radio monitoring system is composed of dense radio sensors in a certain area, and the nodes are interconnected and shared, so the overall cognition performance of the electromagnetic environment is improved. Micro RF sensor is the core equipment in the system, so this paper constructs a micro RF...

This paper presented a high speed data acquisition system for real-time bioelectrical sensing application. The hardware of system mainly consists of data acquisition, distribution and storage section. Four dual-channel ADCs are applied in acquisition section. In distribution section, the original data...

This paper presents a method of model construction for the power system transient stability assessment based on statistical learning theory integrated with the bagging and the approximate reasoning. Support vector machines operate on the principle of structure risk minimization. This paper takes full...

In light of the current development of smart grid in China, this paper established the risk assessment index system, and conducted a comprehensive evaluation based on the rank correlation analysis and gray triangle clustering method. Calculation examples indicate that the risk level of our smart grid...

In this thesis, we take SH79F32 as main chip, LCD12864 as the display screen,the ultrasonic sensor of HC-SR04 as collection tools and reach the function of ultrasonic distance measurement. Through Altium Designer Release 9 to conduct schematic design and draw PCB, and then solder circuit boards, use...

Numerical simulations are used to investigate the statistical properties of the instantaneous difference in the received powers between the two ends of a bidirectional optical wireless communication (OWC) link through atmospheric turbulence. The probability density estimates of the instantaneous difference...

Ambiguity function describes the measurement accuracy, resolution capability and ambiguity degree of signal delay and Doppler frequency shift, which can be used to analyze the resolution of adjacent targets and anti-interference performance of the system. In this paper, the binary digital modulation...

This paper presents a semantic technology-oriented approach(STOA) for architecting sensor networks applications using publish/subscribe(Pub/Sub) paradigm. Considering the high level abstraction which is necessary for sensor networks knowledge sharing and reusing, sensor ontologies are defined to describe...

This paper mainly analyses the necessity to manage the explosive in the coal mine blasting equipment library. It makes intelligent management possible by using digital monitoring technology, communication technology and software technology and sensor technology for reference. High performance microcontroller...

Private wireless network communications technology is a key technology of the smart grid, but the scarce spectrum resources greatly restrict the development of the private wireless network communications technology. At present, the 230MHz spectrum can only support a low transfer rate, makes it hard for...

Aiming at photoelectric current transformer technology, this paper analyses the principle of passive and active transformer firstly, then discusses the main technical difficulties in this area currently and the development of optical current transformer. We hope all above can play a reference role for...

This paper analyzed the basic principles of the alternating current withstand voltage test technology work of the same frequency and phase.And at the same time analyzed the danger that exist during the process of the test that basic on the GIS equipment,put forward corresponding preventive and control...

In order to carry out comprehensive analysis and study on the application of GIS in the same frequency and phase AC voltage withstand test method,this paper studied the same frequency and phase AC voltage withstand test of GIS, briefly described the test device and the connection principle of same frequency...

The methods of reliability analysis for parallel-redundant system are different from the traditional two-state system, according to multi-state reliability theory, the design of the three-state electrical parallel-redundant system was optimized, and a mathematical model of the reliable degree for the...

Specific to the usual methods for insulation monitoring—dc superposition method, double frequency principle and zero sequence current amplitude comparison method, the work principle and applications of these methods were compared and analyzed, and respective characteristics were concluded. On this basis,...

The generation tripping sensitive point could be located by absolute kinetic energy incremental index. A method was proposed which is used to locate this point based on the estimation of unbalance power during short circuit period. The voltage was separated to two parts: one was determined by the pre-fault...

There are a lot of converters in the DC microgrid. These tightly regulated closed-loop converters may cause stability problem of bus voltage when used as a load. In order to improve the stability of the DC microgrid, a novel stabilization method based on exact feedback linearization is proposed. The...

For the huge amount of image data, high transfer rate, high real-time requirements of the imaging system, this paper proposes a high-speed image data acquisition and storage system based on TMS320C6748 DSP, with the use of uPP interfaces to capture images from the FPGA in real time, using GPIO and UART...

OFDM Visible light communication (VLC) systems can achieve both illumination and data transmission simultaneously via light emitting diodes (LEDs). Orthogonal frequency-division multiplexing (OFDM) has been considered as a promising multi-carrier modulation technique for VLC due to its ability to boost...

In this paper, according to the characteristics of distribution network reconfiguration. A Novel Firefly Algorithm was used to solve distribution network reconfiguration, the algorithm was experimented and the experimental results show that the new algorithm to be successful. Simulations and results...

Laser cladding has been widely introduced into industries for improving or changing the behavior of material to against corrosion, wear and so on. In the process, the molten pool, which is related to powder mass and others, is formed to melt the introduced powder onto the substrate. Thus, the area and...

This paper, based on the damage effect of electromagnetic pulse (EMP) on satellites, firstly analyzes electromagnetic leakage elements of typical satellites, emphasizes the coupling process between EMP and satellites and its damage effect on satellites, and conducts preliminary simulation on antenna...

A free-standing TiAl based microlaminate sheet with thickness of 300 m was deposited with high-power electron beam physical vapour deposition system. Microstructure and phase analysis of as-deposited samples were studied by XRD, SEM and TEM. Toughening by structure was analyzed with tensile test. The...

To provide a amplitude, frequency programmable current signal with high precision for fault detection of 10kv rural power line this paper presented a high precision current signal source using DDS (Direct Digital Frequency Synthesis) technology. The system includes two parts which are signal generator...

The heat feedback of flame plumes is a main form of energy transfer and a significant contributor to fire growth and spread. The paper introduces the case of heptane pool fires in open spaces. A corresponding formula is proposed along with the simplified model of plume heat feedback based on the analysis...

In order to make a precise and quick estimation of the wide-band Frequency-Hopping(FH) signal, a blind parameter estimation using numeral characteristics of compressive samplings is proposed. First study the compressed numeral characteristics (CNC) of the signal on the premise of non-reconstructing the...

The “passive house” was first presented by Prof. Adamson (Lund University, Sweden) and Dr. Wolfgang Feist (Germany) in 1988. Nowadays, “passive house” has been widely used as a kind of a low-energy consumption and high comfort energy saving building around the world. In 2014, the Passive and Low-Energy...

In this paper, an ultra-low-power integrated RF front-end for UWB system is proposed. It contains a single-ended low noise amplifier (LNA) and a double balanced mixer. The resistive shunt feedback topology is employed to achieve a good input impedance matching in the whole UWB band. The stacked common-source...

As our material life level unceasing enhancement, people's health consciousness and Care awareness has greatly improved compared with the original. At the same time with the aging of the population of China, the health situation and health awareness of the elderly is also deeply concerned by the society....

A novel series-structure power transmission system connected by LCC-HVDC (line commuted converter based High Voltage Direct Current) and VSC-HVDC (voltage sourced converter based High Voltage Direct Current) is studied. The coordinate supplementary control of LCC-HVDC and VSC-HVDC is proposed to deal...

Ferroresonance over-voltage mechanism of converter transformer bushing tap caused by charging to connection was researched, and PSCAD model was established based on actual parameters of the site for analysis. A method of increasing the damping resistor was proposed to inhibit the ferroresonance, and...

It is important that control center operators be alerted to system disturbances, including where, when and what disturbance occurs, so that proper anticipatory actions can be promptly taken if necessary, avoiding oscillation spreads in the power network. In this paper, the wavelet multi-resolution analysis...

It is of great help to take proper anticipatory actions to eliminate the disturbances that identifying disturbances timely and accurate, avoiding blackouts. In this paper, the wavelet multi-resolution analysis based method is introduced to identify power system disturbances. The effectiveness of the...

In this paper, one calculation method based on field-circuit-network coupled co-simulation is presented. Compared with the traditional simplified transformer model, this transformer model takes the nonlinear factors into account, and the accuracy of the simulation results will be improved. The transformer...

This paper presents the design of a 6GHz track-and hold circuit with input bandwidth. The track-and hold circuit adopts the design simulation of HBT process, able to work at a sampling frequency of 2 GHz, the highest sampling frequency can reach about 2 GHz. The SFDR of the track-and hold circuit can...

Digital filter is a basic algorithm to speech, image processing, pattern recognition, spectrum analysis and so on. It plays a very important role in digital signal processing. At present, many designers use software tools such as Matlab to model and simulate the digital filter. This paper described the...

According to the principle of electric field polarization, we sputtered one or a few silver squares on substrate to strengthen polarization of local electric field in the depositing system of silver nanowires in an ultra thin liquid layer. In this paper, we observed electrochemical dissolving inside...

The development of micro devices is mainly restricted by chemical battery. Scientists have proposed the method to collect energy from the surroundings and convert it into electrical energy. This article summarizes different energy management circuit modules systematically and sums up the circuit structures....

To the nonlinear model errors caused by the swaying base, unscented Kalman filters and Adaptive Unscented Kalman Filter (AUKF) are designed (UKF) for fine alignment respectively. In this paper, the adaptive estimation principle is introduced into the UKF algorithm. AUKF algorithm can balance automatically...

We fabricate nearly straight silver nanowires with different width by electrochemical deposition, which is possibly applied on nano- scale circuitry in future. The silver adheres to the underlay of the cover glass, with an ultrathin thickness and slick surface, which indicates that the silver deposits...

In this paper, we propose a cooperative transmission framework based on adaptive modulation and coding (AMC) system in multiple-input multiple-output (MIMO) fading channels. We consider the scenario that consists of one source node, one relay node and one destination node, they all equipped with multiple...

This paper presents an improved hybrid multilevel converter for renewable energy generation. Topology and operating principles are investigated. Nearest Level Modulation (NLM) and control strategies under normal and dc fault conditions are studied. A 61 voltage-level model is set up in PSCAD/EMTDC. Simulation...

An improved Allan variance method (IAVM) is proposed for the characteristics analysis of the band-pass mixed noise to distinguish the different types of the noise in the band-pass mixed noise and give the corresponding intensity coefficients of the power spectral density (PSD) of the noise. This proposed...

In PV microgrid control system, the delay and filter inductance value change will influence the response speed, stability and grid-connected current distortion rate of system. Therefore, this article proposes a power feedforward robust prediction dead-beat grid-connected control method. The system’s...

Along with the rapid development in modern science and technology, the equipment in every manufacturing industry and field has been constantly renewed and upgraded. It is the same case with the equipment of power enterprises, which have been enhanced under the general background of scientific and technological...

The extensive utilization of electric power makes the safety of power supply facilities become the priority among priorities, and the failure of the power supply facilities will bring immeasurable loss. How to prevent in advance, response rapidly to the failure, and recover rapidly power supply is the...

This article analyzes the current electronic warfare is faced with numerous and complex electromagnetic environment, in the dual machine cooperative reconnaissance system, the reconnaissance receiver with a timely and accurate manner to select the application requirements of the radar emitter signal,...

Based on Electromagnetic projection theory, this paper presents an Electromagnetic bidirectional weft insertion mechanism, and establish its electromagnetism and kinetic model. Based on classical vector Electromagnetic force density model, established projectile - Electromagnetic force mechanical model....

As the control input of the virtual reality flight simulator, precise head tracking with no time-delay is essential for user immersion and training effect. We present the results of applying a modified Kalman filter to improve head orientation prediction. A piecewise constant acceleration approach with...