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.
The important measure and key point for Central China Region to grow up is to develop modern logistics industry. Based on actuality analysis of logistics industry in Central China Region, a dynamic feedback causal diagram of logistics in Central China Region is established. The growth mechanism and the growth limits of logistics industry in Central China Region are revealed by using the method of...
In order to overcome the difficulty of power supply of electrical valve in the deserts and other circumstances, a novel method of power supply with photovoltaic cell is proposed in this paper, and constructs the controlling circuit of digital software phase-locked loop (DSPLL) using digital signal process (DSP), which is driven by pulse width modulation (PWM) controlled by DC motor. Finally, the experimental...
A detailed study of the nonlinear couplers based on Ag stripes is presented. The output characteristics of the couplers are analyzed and the switch effect is found. The LR-SPP optical switch has been investigated at λ = 0.633μm, 1μm, 1.55μm, demonstrating the feasibility of LR-SPP-based all-optical switches for operation in the very broad wavelength range. The critical optical power p of nonlinear...
Based on the input-output linearization method of differential geometry theory, the internal dynamics i.e. remaining dynamics of the nonlinear three-phase AC/DC voltage-source converter system, with output represented by (id, uc) i.e. direct voltage control and (id, iq) i.e. indirect voltage control respectively, are been studied. It is pointed out that the three-phase AC/DC voltage-source converter...
Traditional Chinese medicine (TCM) is a clinical medicine. The huge clinical data from the daily clinical process which keeps to TCM theories and principles, is the core empirical knowledge source for TCM research. Induction of the common knowledge or regularities from the large-scale clinical data is a vital task for both theoretical and clinical research of TCM. Topic model have recently shown much...
In the paper, a novel active power filter with a shunt transformer and an inverter is proposed. A transformer is chosen and its primary winding is connected in parallel with harmonic source, the primary fundamental voltage is detected and functions as the given signal. A voltage-source inverter is applied to produce a controllable fundamental voltage source, which is energized across the secondary...
We present a theoretical study of the directional couplers (DCs) based on V-groove plasma waveguides with the groove angle thetas = 20deg and a wavelength of 1550 nm. DCs based-on metal grooves with different separation distance are analyzed. Curves of coupling lengths with waveguide separations are given. The normalized output power of two output ports of single-input DCs is analyzed. Finally new...
The photo-electric characteristic in the new soft optical-electric materials-ionic liquids (ILs) was firstly studied by experimental method. It has been found that the peak power of the optical signal that comes from Amplified Spontaneous Emission (ASE) source to ILs becomes oscillated when an electrical signal is applied to ILs, and the amplitude of the oscillation is dependent on the frequency and...
CBA is a classification algorithm integrating association rule mining and classification. CBA has been widely used in data mining areas because it has higher accuracy than C4.5. When the samples become more and more large and characteristic attributes become more and more numerous, CBA algorithm becomes much lower. In this paper, an improved CBA algorithm based on rough set is proposed. The improved...
The basic idea behind an ID-based cryptosystem is that user's public key can be determined by his identity information. Comparing with the traditional certificate-based cryptography, ID-based cryptography can eliminate much of the overhead associated with the deployment and management of certificate. However, exposure of private keys can be the most devastating attack on a public key based cryptosystem...
Cascading failures present severe threats to power grid security, and thus vulnerability assessment of power grids is of significant importance. Focusing on analytic methods, this paper reviews the state of the art of vulnerability assessment methods in the context of cascading failures. These methods are based on steady-state power grid modeling or high-level probabilistic modeling. The impact of...
With the growth of interest in multicast communication networks, the importance of routing techniques for multicast connections is being emphasized. In this paper, we propose a new multicast algorithm for a k-ary n-cube network, the randomized local balance multicast (RLBM) that outperforms unicast-based multicast routing scheme. Simulation results show that if choosing the proper threshold, the RLBM...
Scalable router, as an effective way to rapidly improve the performance of routers, has received increasingly attention from both academe and industry. However, the routing lookup in scalable routers is different from that in traditional routers and lack of research. In this paper, we present the first systematic study on this topic. We first discuss routing lookup in scalable routers and provide...
Load-balanced architectures appear to be a promising way to scale Internet to extra high capacity. However, architectures based on mesh topology have a node-degree of N, which prevents these architectures from large node numbers. This consideration motivates us to study the properties of node degree and its impact on the corresponding load-balanced architectures. In this paper we first show the asymptotically...
Rolling cut shears are important equipments of steel plate production. They have significant influences on the quantity and quality of products. There are many relative factors that influence the performance of rolling cut shears. For the optimization of mechanism design of rolling cut shears, a CAD software has been developed and was used for the analysis of the factors such as crank radius, link...
To solve the problems of 'irreversibility', 'error accumulation' and randomicity of classification order in multi-class classification of support vector machines based on binary tree (BT-SVM), the paper proposes a multi-class classification method of support vector machines based on double binary tree (DBT-SVM). According to the method, each sub-classifier of BT-SVM is modified. After unknown samples...
The E-cash schemes that are revocable anonymous with the help of trusted third party (TTP) cause additional costs and the level of anonymity is uncertain. Kulger et al adopted auditable tracing to control deanonymization without TTP, but the users have to audit the tracing frequently. A loss reportable e-cash scheme without TTP based on ECC is presented in this paper. In our scheme bank demands user...
Large blackouts are typically caused by cascading failure propagating through a power system by means of a variety of processes. Because of the wide range of time scales, multiple interacting processes, and the huge number of possible interactions, the simulation and analysis of cascading blackouts is extremely complicated. This paper defines cascading failure for blackouts and gives an initial review...
In view of the issue that the accuracy of the node location of wireless sensor networks (WSN) is low by adopting maximum likelihood estimation (MLE) in estimating the measurement information value with big noise, a new node location estimation scheme based on support vector regression (SVR-NLE) is proposed. Through learning the relation between the real value of trilateral and node coordinate, this...
A new AC-DC-AC matrix converter topology based on Sepic is proposed. The basic configuration of the new topology and its fundamental principle are firstly introduced, the analytic expression on the function of voltage transfer ratio and duty cycle is analyzed, and the rationale of double-loop control strategy is clarified. Finally the validity and feasibility of the new topology are tested by means...
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.