The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper discusses the control strategy of DC-capacitor voltage in single-phase STATCOM with drastically reduced capacitance. Reduced capacitance results in a high amplitude of the capacitor voltage oscillation; therefore, the peak voltage control is important to keep the dimensional size of the capacitor compact. A good dynamic peak voltage estimation method has been proposed for the control. This...
The main purpose of this paper is to analyze the vibration response of space flexible manipulator when suffering the impact impulse at its end-effector. Firstly, the manipulator flexibility is described by assumed mode method, and on this basis, the kinematics equation is established. Secondly, the free vibration equation of the beam is established by using the cantilever beam model to simulate the...
With piezoelectric layers attached, the electrostatically actuated microbeam-based MEMS (Micro-Electro-Mechanical Systems) is modelled to study the pull-in instability based on a modified couple stress theory. The nonlinear differential governing equation and boundary conditions of the beam are derived by using Hamilton's principle. The results show that the piezoelectric layers can decrease the pull-in...
By incorporating the strain gradient elasticity into the Timoshenko nanobeam, a size-dependent model for wave propagation in such nanobeam is developed. The formulations of dispersion relation are explicitly derived for strain gradient nanobeam and presented for different material length scale parameters (MLSPs). The size-dependent characteristics of wave propagation in Timoshenko nanobeam are then...
Recently, cognitive radio has been proposed to improved the spectrum resource utilization efficiency. The secondary users (SUs) are allowed to sense, detect and access the frequency bands that are not currently being in use by primary users (PUs). In fact, SUs always have no knowledge about PUs' exact communication mechanism. In order to guarantee PUs' communication quality of service (QoS) and satisfy...
This paper proposes an optimal scheme to balance the trade-off between signaling load and radio resource utilization in UMTS networks. To efficiently use limited radio resource, 3GPP introduces RRC state transition mechanism in UMTS. This mechanism uses a timer called TDCH to determine when mobile phone should release its connection to network. To examine the impact of such a timer on radio resource...
For the feature selection and parameter optimization of LS-SVM, propose a At first, a population of particles (feature subsets) was randomly generated, then the features and parameters are optimized by PSO algorithm. The experiments on the UCI database indicate that the proposed method can efficiently find the suitable feature subsets and LS-SVM parameters. Also, comparison are made against GALS-SVM...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.