Search

The slime mould algorithm (SMA) is a recently developed meta-heuristic optimization algorithm which is based on the oscillation mode of slime mould in nature. However, the SMA is often trapped in local optima for global continuous optimization problems. To strengthen SMA's exploration for global optimum, we propose a modified SMA, which takes randomization based on a Levy distribution instead of the traditional uniform one, namely LF-SMA. Our LF-SMA is integrated with Levy-flight guidance to its optimal paths for connecting food with excellent exploratory propensity. Experimental results show that the proposed LF-SMA achieves better performance in 13 benchmark test functions and one investigated engineering case in terms of both computation cost and solution.

A new array formation method for millimeter-wave (mm-wave) transverse slot scanning array antenna is proposed, which can effectively solve the grating lobes problem caused by the traditional array formation method. To verify the array formation method, a mm-wave scanning array antenna at 30GHz is designed, which consists of a traditional substrate integrated waveguide (SIW) 4 x 4 Butler Matrix (BM) feed network and 16 transverse slot elements. The distance between adjacent transverse slot elements is equal to half waveguide wavelength, and the transverse slot array antenna uses the metal cylinder matching method to improve the effective bandwidth of the array antenna, a −10dB impedance bandwidth (BW) of scanning array antenna from 28.9 to 31.04 GHz is simulated. The peak broadside gain of the array antenna is 13.7dB. This type of transverse slot scanning array antenna will have many applications in the future 5G mm-wave band.

A 2-D Butler matrix (BM) in uniplanar configuration for designing multibeam array antenna (MAA) is proposed using substrate integrated waveguide (SIW) technology. Firstly, a novel topology for building uniplanar 2D BM is proposed, which successfully transforms the traditional 3-D topology to a 2-D (or uniplanar) one. To realize the planarization of basic components, a novel design of eight-port hybrid couplers, is developed to transform four spatially intersected couplers to a planar structure. To address the issue of excessive path intersections, a novel SIW eight-port crossover is proposed to reduce the number of path intersections from 16 to merely 4. Using this proposed 2-D BM, a 2-D MAA with 16 (4 × 4) beams can be realized.

A miniaturized multibeam array antenna fed by a compact beam-forming network (BFN) in multi-layer substrate integrated waveguide (SIW) technology is addressed. As the BFN, an E-plane 4 × 4 Butler matrix (BM) is designed. It is stacked with basic components in the vertical direction so that the dimension can be significantly reduced. Furthermore, some modifications of the BM have been made to obtain further miniaturization. The total occupied area of the designed antenna, including the BFN, is merely 3.8 1 × 0.5 1, which provides an attractive alternative for future 5G applications.

A miniaturized dual-loop near field communication antenna of size 15 mm×25 mm is proposed for metal cover smartphone applications. By embedded it with a small rectangular slot of size 8 mm×16 mm loaded metal cover, the direction of the eddy current induced on metal cover will be the same with the current flow the on the dual loop NFC antenna coil. It's worth noting that the proposed NFC antenna design was certified by the Europay, Mastercard and Visa (EMV) test.

This work presents a compact 28-GHz two-dimensionally (2-D) scanning multibeam array antenna with sidelobe suppression in substrate integrated waveguide (SIW) technology. The proposed antenna is comprised of a 2 × 8 slot array and a beam-forming network (BFN), which is realized by combining two dual-layer 4 × 8 Butler matrixes (BMs) and four 90° couplers. The introduced 4 × 8 BM can help suppress the sidelobe level (SLL) in the E-plane so that the anti-interference capability in the E-plane can be improved. Taking the complicated structure of the classic 4 × 8 BM into account, some modifications of the BM are conducted to achieve better compactness.

On the basis of tested data, the performance of NMOSFETs with PDA treatment in drive current, S.S. values and channel mobility is superior to that with DPN treatment. Comparing two nitridation treatment processes at the same annealing temperature, it seems that PDA proving the hydrogen to fix the dangling bond on the channel surface is more beneficial for device performance before the reliability test. Furthermore, the capability in healing of oxygen vacancy of gate dielectric is little better than that with DPN, illustrating in lower gate leakage, especially as the channel length is narrowed down.

An operation in 1.8V supply voltage single-ended cascode low-noise amplifier (LNA) structure was launched. This designed circuit provided the lower noise figure and matched the suitable LC tank to enhance the central operating frequency as well as the excellent input and output impedance matching incorporated into this LNA circuit. In this simulation, the Agilent ADS (Advanced Design System) simulation software and tsmc 0.18 μm CMOS process parameters were adopted to achieve the low-cost characteristics and high integration to fit the performance of 5.2 GHz LNA design under IEEE 802.11a specification. Due to the precise calculation gaining the good impedance matching, the simulation results showed the forward gain (S 21 ) about 12.96dB, as well as less than −15dB isolation (S 12 ). The input impedance (S 11 ) and the output impedance (S 22 ) also represented good performance. In addition, the minimum noise figure and the signal linearity performance were quite good, so that this LNA circuit was better in the availability and possibility of RFID tags.

Strained Engineering including both global and local strains effectively enhances the mobility of carriers, in which global strains are generated by the mismatching of lattice constants at the junction of Si and Si0.775Ge0.225 and local strains are aroused by Source/Drain refilled with SiGe. In this paper, junction breakdown voltage, punch-through voltage, and the variation of threshold voltages are to be determined. Strained and non-strained devices are also put in comparison. It is then concluded that the strained engineering technique works promisingly for meeting the requirements of next generation devices.

Mismatched lattice constants between SiGe and silicon can cause the strain making the mobility improved. SiGe are grown underneath the channel apparently to form global strain over the whole devices, while Source/Drain refilled with SiGe would squeeze or pull up the devices uni-axially. The ID-VG characteristics curves and the maximum trans-conductance (gm) using strain engineering are observed to be superior to the baseline. Nevertheless, the breakdown voltages with strain engineering no longer enjoy as robustly as ones without.

Camera is demonstrated to be the basic image and video input device and it is widely used in many fields. One of its applications is to locate an object's position and various methods have created. High-capacity of RAM and rigorously required processing speed is necessary in these methods. Utilizing interrupters and counters to monitor the synchronizing pulse signals, changing its scanning model from "line scanning" to "column scanning" by artfully rotating the camera with 90°, an "array detector" is produced. By comparing the recorded line-counter number with the total scanning line number which is determined by the resolution of the camera, experiments have showed that this method can easily obtain an object's position information with an acceptable approximate accuracy and be applied in obtaining positions of objects.

To meet the information demand of community health management, health management meaning and its requirement is analyzed, main work content of community health management is provided, medical information education platform (MIEP) is set up by network technology and medical information education method to share disease information for community citizen, disease cure record, physical examination result and health condition record are covered in this information platform, application of community chronic disease management is discussed, several advantages of MIEP application in community health management are summarized.

Microgrid is a newly proposed organization of distributed generation system. It can operate in net-connected mode and islanded mode, when the operation switches between the two types of mode, the variety power will emerge. If this happens, the level of the system voltage will be fluctuating in a wide range, and the system frequency will also be fluctuating in an unacceptable range. The load power supply will be influenced seriously. To minimize the influence on load power supply, in this paper we adopt two different types of control strategy: invariable power control and invariable voltage control. Appling them to the distributed generators in different operation mode, we established simulation models. The result proves that the control strategy is valid.

The fatigue crack easily occurs in the nodes of the steel truss bridges which are under long-term load of moving train, it may endanger the safety of a bridge and even lead to its collapse. Therefore, it is essential to research on it. This paper introduces the detailed procedures of modeling a 3-D straight through crack in a node of a steel truss bridge by using the commercial FE software ANSYS with solid modeling method, and then to calculate stress intensity factor for the crack tip. The results showed that the solid modeling method was simple and efficient and could be carried on easily, it was suitable to establish complicated configured model and had a high precision guarantee of stress intensity factor.

Thunderstorm downbursts are major cause of concern for engineering structures both on ground as well as those in air, namely aircrafts. The wind velocity profile of a thunderstorm downburst-induced wind is significantly different compared to natural atmospheric boundary layer winds. As a type of high intensity winds, thunderstorm microbursts have caused numerous structural failures around the world and have become the present research focus in structural wind engineering. The current study proposes a computational simulation method on thunderstorm downburst-induced winds. The computational fluid dynamics numerical method was employed to investigate the wind fields of thunderstorm downburst-induced wind. Unsteady simulations of wind fields were conducted using time-filtered Reynolds Averaged Navier-Stokes (RANS) numerical simulation method. The case study numerical results indicate that the wind fields present quite different characteristics at different time during the whole formation and diffusion process. The computational simulation method supplies a promising solution to study the thunderstorm downburst-induced wind characteristics for structural wind engineering.

According to the basic theory of grey system correlation space, a type of new grey incidence degree model is constructed by starting from the perspective of n dimensional linear space. This paper makes a research about some properties of the incidence degree and compares this incidence degree with Deng's. Results indicate that this incidence degree has the same properties with Deng's; and it also has some unique advantages. It can reflect the relevance better between system factors in the view of distance space, further enrich and perfect the theoretical system of grey incidence analysis.

This paper introduces a new contact electrostatic potential sensor. The principle of resistance-capacitance voltage divider is adopted, and design in the way of integrated distributed capacitance. Adjust the proportion of resistance and capacitance, distributed capacitance is dispersed, so good performance on frequency characteristic is gotten; input impedance is augmented, partial voltage test method is adopted, so high-speed response characteristic is gotten. When the sensor is used the dynamic electrostatic potential can be tested real-time. The situation which the dynamic electrostatic potential can be tested real-time by non-contact instrument is changed. The high-voltage direct current characteristic and frequency characteristic are calibrated, and the result fits design requirement. This testing system is used to test the dynamic electrostatic potential of human body. Steady operation and rapid response are verified by the testing result. So the characteristic of the sensor fits design requirement

The safe early-warning system for roof spatial latticed structure of Wuhan Natatorium is composed of sensing subsystem, database and administration subsystem and safe early-warning identification subsystem, which is automatic operation by system integration technique. According to the characteristics and service environment of roof spatial latticed structure of Wuhan Natatorium, the two key techniques are proposed; one is assessment structural key rods' work status by data-acquisitions from strain gauges, another is detection firn thickness on the roof by fuzzy pattern identification method. The results of safe early-warning are displayed clearly by friendly interactive interface. The system operating satisfactorily demonstrates the efficient of safe early-warning system.

Wind hazard is the one which has the widespread influence in the nature disaster. Transmission towers have experienced a number of failures due to downburst wind events in recent years, with devastating economical and social consequences. Based on the mechanism of downburst wind load, the present paper proposes an AR model method of adding turbulence to the non-turbulent wind speed. The various aspects of the model are then integrated to create a method suitable for generating wind speed time histories for the dynamic analysis of high-rise structures subjected to downburst winds. Keywords-downburst wind; mechanism of downburst wind loads; wind velocity time history.

single device contingency analysis. Against such backgrounds, Cascading failure is a chain reaction of a series of other this paper proposes a method for cascading failure simulation components outage caused by the failure of a certain with static security analysis method, which considers the load component in the system, which is an accident with a low variation during the fault. The method is divided into two steps: probability but serious consequences. Bus failure, line failure, firstly, a self-adapting step is figured out with the climbing rate of breaker failure, misoperation and rejection of the relay the daily load curve, and secondly, the power flow at the self- protection and sudden transfer of large power flows are the adapting step, which is used to judge if another fault or even the main reasons of power system's cascading failures. It can be cascading event has happened is calculated. In this way, the seen from the analysis reports of "8•14" blackout in USA & process of cascading failure can be simulated and monitored, Canada and other blackouts that cascading failures are not which is beneficial for the operators to obtain the operating state formed in a moment. Generally at the early stage of the of the power system in time and adopt appropriate measures to blackout the system is unlikely to show the characteristics of prevent the system from deteriorating into a large-scale blackout transient instability, instead it shows the redistribution of power accidents. Finally, the standard IEEE 30-bus testing system is flow formed by a series of line outage [11]. adopted to verify the correctness of the method. And the study of cascading failure mainly centralized on

Si-rich SiOx planar waveguide with Si nanocrystals contributed amplified spontaneous emission at 750-850 nm is characterized by variable stripe length method to demonstrate optical gain and loss coefficients of 60 and 16 cm-1, respectively.

Temporal correlation between spike trains of different neurons organizes a functional neural ensemble, which encodes information in memory processing. In this paper, simultaneous multi-site neural ensemble recording was used to investigate firing patterns under different memory condition. APV was injected into rat's anterior cingulate cortex (ACC) to break up memory function in anesthesia condition, two temporal correlation coding methods: UP-DOWN coding and Pearson correlation method were used to express different firing patterns of rats ACC multiunit before and after APV injection. The result showed that UP state counts decreased with shorter UP duration and population correlation of neural ensemble decreased with the injection of APV. Both of the coding methods revealed the relationship between temporal correlation in a neural ensemble and different memory conditions, provided a support to explore the mechanism of synaptic plasticity of memory.

This paper proposes a new projection onto convex set (POCS) algorithm for enforcing two way constraints originated from point matching, which is based on clustering and quadratc programming. Via point clustering, the original POCS problem where the convex set is described by point correspondence' constraints is converted to the POCS problem where the convex set is described by cluster correspondence's constraints. As a result, a lower computational complexity is achieved. Then a numerical quadratic programmming (QP) technique is employed to solve the POCS problem, which, in practice, shows to be capable of achieving better performance than existing successive POCS (SPOCS) algorithm. Simulation results show that the algorithm has satifactory accuracy and computational save.

This paper proposes a new method to align two images that are rotated and translated with respect to each other. Existing approaches usually take the strategy of constructing translation invariant representations before recovering rotation as a result of phase correlation between them. In comparison, our method directly constructs an evaluation function of rotations, which comes from the quadratic sum of the one dimensional phase correlation between the Radon transforms of the two images to be aligned. The coordinate of this function’s maximum value gives the estimate for rotation. Experimental results show that our method compares favorably to phase-only bispectrum based method and can estimate large rotations and medium translations both robustly and accurately.

This paper proposes a clustering successive projections onto convex sets (CSPOCS) algorithm for enforcing two way constraints originated from point matching. Via point clustering, the problem of projection onto convex set (POCS) where the convex set is described by point correspondence's constraints is converted to the POCS problem where the convex set is described by cluster correspondence's constraints. Then the successive POCS (SPOCS) technique is employed to solve the POCS problem. The resulting algorithm can be viewed as a generalization of SPOCS by combining with clustering. Its precision and computational load are decided by the average radius of clusters. Experimental results demonstrate the effectiveness of the algorithm.

The results of moving object detection in image sequences are often represented as binary image sequences containing both masks of moving objects and false positives, which make it necessary to quickly eliminate false positives and preserve the interested moving objects as completely as possible online. Traditional approaches such as morphological filter and area threshold filter, sometimes, are unfit for the job because of unsatisfactory results and heavy computational load. In light of the fact that foreground pixels density caused by moving objects is higher than that of caused by disturbances, we propose a novel binary image filtering method based on discrete information entropy (BIFBE) for the task. Experimental results show that BIFBE is more effective and has less computational load than traditional methods

On the basic of studying the intelligence route guidance and control system, the multi-layering control system can be simulated through artificial neural network (ANN) models and the evaluation and act control of hierarchy route guidance system can be realized in this paper. Then the large control system can be simplified and realized, and the controllability of control system can be realized. The problems of nonlinear, fuzzy, dynamic, large scale control system can be solved and an intersection model of ANN can be discussed in detail. The problem of the intelligence route guidance system can be achieved in the same method.