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Using energy efficient way transmission is very important for extend the life of the sensor network. LEACH is a based on cluster protocol, it uses the local cluster random rotation mechanism will be the energy load is evenly distributed to all sensor nodes in the network. The cluster head will be collected and fusion data for base station. This paper proposes an improved scheme, using the random clusters...
TH precoding can effectively eliminate the interference between the channels in the MIMO system, improve the reliability of the system. Compared with the linear precoding, the capacity of the system also has a considerable increase. But there are still some problems. In this paper, the traditional TH precoding is improved. The channel matrix H is decomposed by GMD. The SNR of the parallel MIMO sub...
In order to improve the positioning accuracy of wireless sensor networks, as little as possible to use the beacon node, and controlling the costs. This article used trilateral positioning method for positioning. While, from improving measurement accuracy, angle adaptive environment for wireless sensor nodes. This paper presents a beacon node localization algorithm weighted least squares. The algorithm...
A double-folded inverted-L antenna with directional radiation for indoor access points applications is presented. The antenna comprises a microstrip fed double-folded inverted-L radiator and a centrally slotted ground. The radiator is a printed inverted-L antenna whose arm is extended and folded. A directional radiation is obtained by mounting the radiator above the ground. A vertical slot is etched...
To solve the power supply problem of injection DC side active filter, an intelligent hybrid injection type active power filter are put forward, making use of solar photovoltaic power generation system to provide energy to injection active power filter DC side. It is used to solve the problem of energy source of active filter and improve the power quality of the grid under the premise of green energy...
An electric field sensor D-dot followed by a magnetic field sensor B-dot are introduced. The principles and configuration are introduced first, and the paper will give out the calibration results. Using the two probe sensor measurement system, the original signal and integrated signal are compared. According to the measurement results, it is believed that two sensor can be improved further.
A new particle swarm optimization algorithm that based on two swarm's evolution is proposed. In one swarm the linear decreasing weight is used, in the other swarm the random inertia weight is adopted. The random disturbance is added to the formula of position update. During the running time, a new swarm is generated by the contest of two swarm's evolution. The ability of particle swarm optimization...
A new approach conjugating the compressive sensing (CS) and the Method of Moments (MoM) is proposed and validated in this paper for fast analyzing the monostatic scattering problems. The nonuniform rational B-spline (NURBS) is introduced to MoM for the purpose of reducing the unknowns in the electric field integral equation (EFIE). Meanwhile, the CS theory is utilized to decrease the sampling rate...
The shooting and bouncing ray (SBR) method is highly effective for solving the electromagnetic scattering problems. This paper introduces the octree based SBR-PO method, due to the fact that traditional SBR method is not fast enough for scattering prediction for electrically large target. Using the octree structure to rebuild the target model and process ray tracing based on this technique can obtain...
Interferometric ISAR is a promising technique which uses phase difference between ISAR images generated by multiple sensors to obtain the height information and the effective rotational motion of the target with respect to radar. However, the phase of the interferogram must be unwrapped to remove the modulo-ambiguity before estimating the height and rotation of the target. In the conventional phase...
A fuzzy node is a fuzzy set whose membership function contains some uncertain parameters. Two fuzzy nodes are connected if the uncertain parameter of one node is provided by the fuzzy set from the other node. A fuzzy network is a connection of a number of fuzzy nodes. We define Gaussian Fuzzy Networks and study a number of basic connections in details, including basic center, basic standard deviation...
Aiming at the applications of image fusion with high contrast and texture information, an effective image fusion method based on redundant-lifting non-separable wavelet multi-directional analysis (NSWMDA) and adaptive pulse coupled neural network (PCNN) has been proposed. The original images are firstly decomposed by using the NSWMDA into several subbands to retain texture detail and contrast information,...
We analyze some basic properties of the stock price dynamical model when trend-followers and contrarians interplay with each other. We prove that the price dynamical model has an infinite number of equilibriums, but all these equilibriums are unstable. We demonstrate the short-term predictability of the price volatility and derive the detailed formulas of the Lyapunov exponent as functions of the...
We use fuzzy systems theory to convert the technical trading rules commonly used by stock practitioners into excess demand functions which are then used to drive the price dynamics. First, we define fuzzy sets to represent the fuzzy terms in the technical trading rules; second, we translate each technical trading heuristic into a group of fuzzy IF-THEN rules; third, we combine the fuzzy IF-THEN rules...
We apply the price dynamical model with big buyers and big sellers to the daily closing prices of the top 20 banking and real estate stocks listed in the Hong Kong Stock Exchange. The basic idea is to estimate the strength parameters of the big buyers and the big sellers in the model and make buy/sell decisions based on these parameter estimates. We propose two trading strategies: (i) Follow-the-Big-Buyer...
This paper mainly studies restaurant management, which has the properties of the yield management and alsocan be modeled as the M/M/c queue in system. Therefore, wecan use the price discrimination and the seat allocation tomaximize the expectation of the restaurant's profit, so as toget the optimal price and the seat allocation and according to the optimal value, the manager can make decisions. From...
In recent years, a lot of research work about the commutation failure of inverter has been made by many scholars in domestic and abroad. But most of the research is focused on inverter-side AC power system, especially on multifeeded AC systems. Whereas the impact of commutation failure on rectifier-side AC system is less. Based on EMTDC, the simulation model of Fulong-Fengxian ±800kV ultra high voltage...
This paper designs a kind of 25KV adjustable DC generators. The DC high voltage generator of the designing adopts the technology of linear regulator; voltage doubling rectifier technology produces the output voltage of the wide range of high stability. The generator has strong versatility, safety and economy. Through the simulation analysis, the DC high voltage generator outputs stable amplitude for...
SPD has been widely applied in many industries, such as communication, electricity, railway, airport, petro-chemistry, construction. There has been a problem that how to select the specifications of fuses and circuit breakers to coordinate SPD. Regarding this problem, this paper shares the home and abroad analysis results for reference.
Through the research on modeling and SOC estimation of the battery in the isolated Micro-grid, the behavior characteristics of the battery was analyzed under normal and stable operation, and further more, the condition was determined to guarantee the stability of system based on SOC of the battery. Under the premise of stable operation, a control strategy was put forward based on SOC to adjust the...
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