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Applying liquid-phase exfoliation method, we prepare WS2 dispersions with ethanol and fabricate WS2-PVA polymer composite film. As a saturable absorber, the WS2-PVA film is used to Q-switch a ring-cavity erbium-doped fiber laser. The Q-switched fiber laser can generate stable pulses when the pump power varies from 400 mW to 720 mW. The repetition rate and pulse duration can be tuned with pump power...
Ethanol catalytic deposition (ECD) on the optical tapered fiber was put forward to improve the deposition of two-dimensional (2D) MoS2 materials to exhibit its nonlinear optical properties. This work demonstrated the acceleration of deposition due to high volatility of ethanol compared with other solvents. We believe ECD method is able to be applied to other similar 2D materials such as other types...
In this paper, the method of space alternated phase shift (SAPS) megasonic technology is applied for post-etch (Bosch) TSV wafers cleaning process. The SAPS technology provides uniform sonic energy on each point of entire wafer by alternating phase of megasonic wave in the gap between a megasonic device and the wafer. For this study, 5×50 µm post-etch (Bosch) TSV wafers were used. Experimental verification...
Improving software quality is one of the main goals of software project, the research on software quality evaluation model is important part of software quality assurance and evaluation area. This paper This paper presents a quantitative quality evaluation model on the basis of summering and analysis of the software quality model based on test data. This model used fuzzy system theory. The Experimental...
Today, cyber physical systems (CPS) are ubiquitous in power networks, healthcare devices, transportation networks, industrial process and infrastructures. Security of cyber physical systems has become the utmost important concern in system design, implementation and research. For the past few years, researchers are focus their researches on different aspects of security of cyber physical systems....
Prediction of software development effort and duration is the key task for the effective Software Project Management (SPM). The accuracy and reliability of prediction mechanisms is also important. In this paper, we used several machine learning algorithms to predict the software duration. Experiment results show this kinds of algorithms is effective.
This paper deals with the scheduling problem of software project management (SPM) and present an approach. It addresses this problem by means of the development of an ant colony optimization-based algorithm. This new approach is for resource-constrained project scheduling problem (RCPSP) in PERT networks and Gantt Chart. The goal is to minimize cost and duration. The results show that this approach...
Nowadays, Internet privacy becomes more and more important and sensitive, and has been one of the latest buzz words to hit the Internet world. As one of privacy enhancing technologies, anonymous communication has been extensively studied from various aspects by researchers. In this work, in order to better grasp the present situation of research, we investigate existing organizations and universities...
In this paper, we propose a multi-feature based sparse representation method named multi-feature Fisher Discrimination Dictionary Learning (MFDDL) and apply it to face recognition. In the new proposed method, firstly, to extract the texture information, multi-scales and multi-orientations Gabor Wavelet Transform is proposed for feature representation. Then the local characteristics of the face Gabor...
In this paper, the functions of the received power-distance were deduced and analyzed under the different train operating conditions at first. Based on these functions, an improved path loss model, the triple-slope path loss model, for high-speed railway control signal was raised. And the proposed path loss model was verified by the test data at high speed railways in China. The application area of...
IVR is well known for being able to facilitate interaction between user and computer system. Integrated into IMS service platform, IVR applications can provide value-added services for IMS subscribers. According to the survey of current situation on IVR systems, this research mainly proposes a more flexible and scalable solution on IMS-based AS/MRFC model for IVR services by providing efficient business...
With the rapid development of new energy resources, more and more renewable energy is fed into the grid through grid-connected inverter. A simulation model of PV grid-connected system is built in MATLAB/Simulink, and the output characteristics of the PV cells are analyzed. The P&O method (Perturbation and Observation) is used to achieve MPPT (Maximum Power Point Tracking). A double-closed-loop...
Subcontractor selection plays a key role for the main contractor of a complex construction project. In this paper, we identify the higher partial semi-variance (HSV) of processing times to express the risk of tardiness, and propose a Mean-HSV model to provide a formal description for the subcontractor selection problem. The objective is to select the optimal combination of subcontractors to minimize...
4D reckoning is a core technology to the next generation of air transport management. This paper mainly do research on the aircraft dynamics model under a given flight profile of different phases of flight performance and aircraft performance differences. Then, proposed two models: state switching transition model between different phases of flight, System evolution model under the continuous variation...
IP Multimedia Subsystem (IMS) is well known for its combination of the capability of universal coverage of mobile network and rich application development environment of IP network. IMS has been welcomed by both industry and academic society, becoming the first choice of the Next Generation Network (NGN) technologies. This paper describes the design and implementation of three IMS teaching lab experiments,...
A compact ultra-wideband (UWB) filter with dual notched bands is presented using cascaded shorted-stub loaded stepped impedance resonators (SIRs). The basic UWB filter consists of multi-mode resonator (MMR) loaded with T-shaped stub and interdigital feed lines, having flat ultra-wideband response and sharp rejection skirt. Two cascaded shorted-stub loaded SIRs are symmetrically coupled to MMR, introducing...
A novel coordinate structure hybrid excitation synchronous generator (HESG) with AC excitation is proposed to solve the problem that the air-gap magnetic field of permanent magnet synchronous generator (PMSG) is not easy to control. The structure and operation principle of the HESG are presented. Based on the mathematical model of HESG, the AC excitation field orientation vector control strategy is...
Queries against the large size XML database are often exploratory and users often find their queries return too many answers, this paper proposed a user preference-based top-k ranking approach to deal with this “information overload” problem. We first presented a user preference model which can embody both the partial relations and the interest degree of preferences. And then, the elements orders...
Using the best uniform approximation hybridized with Singular Value Decomposition (BUA-SVD) is proposed to reduce the time requirement for computation of monostatic radar cross-section (RCS). In contrast to our previous work, the best uniform approximation technique is applied to compute the key excitation vectors instead of electric current vectors. Reduction of the number of multiple excitation...
As to the disadvantages of large size, complex internal structure, bad maintainability, inflexible application of the traditional reactive power compensation devices, a new intelligent low-voltage power capacitor based on LPC2388 processor is proposed, which takes the power factor and reactive power as the controlling quantity while considering the effect of voltage. The device can achieve the functions...
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