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.
In this paper, a novel three-port converter(TPC) for stand-alone photovoltaic(PV) power system application is proposed, and also presents the control strategy and power management of this converter. This converter uses three power switches, two inductors and switched capacitor structure to obtain a higher voltage gain and reduce the voltage stress of the power switches. The control for the converter...
A compact and high density integrated design with high isolation for S-band up-conversion system is presented in this paper. The system has two phase locked loop(PLL) frequency sources which provide local oscillator(LO) signals for frequency conversion. In order to realize a high isolation design, the circuits of two PLL and mixer were divided into three independent cavities through a ‘T’ shape crosser...
In order to understand of the relation between the configuration of vertical via interconnection and its transition properties, the performance of millimeter wave wideband vertical via interconnection is investigated in multilayer LTCC substrate in this paper. From physics-based equivalent circuit modeling approach, the equivalent circuit are related to the geometry directly, which is an efficient...
It is a research hotspot that the evolutionary algorithm is applied to the nonlinear parameters identification of turbo-generator speed governor system, but the single evolutionary algorithms have varying degrees of defects: the premature convergence and slow convergence speed. A hybrid optimization algorithm (DEPSO) is proposed to overcome single evolutionary limitations based on the combination...
For medium- to high-voltage, high-power direct AC/AC conversion, modular multilevel converter (MMC) is a potential solution due to its outstanding features. However, MMC suffers from branch energy instability when frequencies of input and output are equal. This paper presents a single-phase five- branch MMC which is capable of direct AC/AC equal frequency conversion without branch energy stability...
The principle of predictable weighting algorithm is that a good clock is a predictable clock, we observed that deterministic signature such as frequency drift and ageing do not affect time scale stability if well predicted in studies of the algorithm. The clock difference is a non-stationary random process, in order to reduce noises of atomic clock, improve the stability of time scale, wavelet muti-scale...
An efficient vehicle detection method is proposed for remote sensing images provided by Chinese GF-2 satellite with the 1-meter spatial resolution in this paper. Considering the characteristics of the vehicle on the road in GF-2 image, dark and light vehicles are firstly detected on the masked road using the semi-automatic dual-threshold technique. The residual disturbance (e.g. shadows, lane line...
Heavy metal stress will damage the normal growth and change the bio-parameters like chlorophyll, nitrogen and water content of rice. Simple, speedy, non-invasive test of heavy metal stress to crops means a lot to the agriculture and even the suspend of human being. Many traditional spectral index computed using hyperspectral data can inverse the above bio-parameters. While it is found that some indies...
Repeatedly practice is a key for learners to develop procedural knowledge. However, such exploration and practice could be costly and dangerous in real world. Computer games provides a convenient and safe environment for learners to master procedural knowledge without temporal and spatial constraints. This study developed an Escape Room-like educational simulation game for learning papermaking. To...
This study investigates the impulsive stabilization problem of positive systems with time-varying delays. A new time-varying weighted copositive Lyapunov function is constructed. Sufficient stabilization conditions on the upper and lower bounds of impulsive intervals are established using the convex combination technique. Under the proposed conditions, the positivity and exponential stability of the...
The estimation fusion problem and posterior Cramer-Rao bound (PCRB) are presented for multi-sensor nonlinear systems with uncertain observations. In order to effectively deal with the difficulties caused by uncertainty, a novel method is proposed by introducing 0–1 latent variables. It has two nice properties. Firstly, the derived estimation fusion method can take full advantage of the character of...
Cloud platforms and services usually provide an APIlayer as decoupled, language agnostic interface for both front-endclient integration and back-end data and/or function access. Theavailability and performance of the APIs have significant impact onthe quality of end user or client experiences due to its nature ofinteraction endpoints. However, the extreme dynamics, complexityand scale of the current...
With an increasing demand from emerging logistics businesses, Vehicle Routing Problem with Private fleet and common Carrier (VRPPC) has been introduced to manage package delivery services from a supplier to customers. However, almost all of existing studies focus on the deterministic problem that assumes all parameters are known perfectly at the time when the planning and routing decisions are made...
The demands of migrating legacy on-premises IT assets to cloud dramatically increase with the wide adoption of cloud computing. Researches present automatic combination of multiple proprietary migration services offered by different vendors together to complete cloud migration. However, current cloud migration approaches are mainly basing on the direct on-premises component to cloud component mapping...
This paper investigates the solutions of fuzzy correspondence inequations with sup-conjunctor composition, i.e., it discusses those solutions for the input and output fuzzy sets which are unknown while a fuzzy correspondence is fixed. First, it proves that the solutions of the fuzzy correspondence inequations can be analyzed and formulated by solving the corresponding cut set problems. It then shows...
The great number of power modules (PMs) imposes great computational challenge on the voltage balancing of modular multilevel converter (MMC) as the sorting of the PM capacitor voltages is usually adopted. This paper presents a distributed control method for PM capacitor voltage balancing in MMC. With this method, all PMs in one arm are grouped and the sorting algorithm of the voltage balancing in...
A novel high step-up DC-DC converter with ZVS turn-on switches and ZCS turn-off diodes based on several existed techniques such as coupled-inductor, active clamping, stacked capacitor and interleaved technique is designed and implemented in this paper. The main objective of proposed circuit is soft-switching operation. The leakage inductance of coupled inductors resonates with two secondary-side capacitors...
Industrial wireless mesh networks technologies as WirelessHART, ISA100.11a, WIA-PA, e.g., have become a communication infrastructure for process control in harsh and noisy environment. These control systems are wireless mesh networked control systems (WMNCSs). Compared with wireless sensor networks, the Wireless network control systems have more stringent requirements on reliability and real-time...
Due to its mathematical tractability, the homogeneous Poisson point process (PPP) has been employed to model wireless networks and analyze their performance. The PPP has the fundamental property that in a network with n nodes, the n nodes are distributed independently from each other. As such the PPP is not a suitable model for many networks where there exists a repulsion among the nodes. In order...
In this paper, we propose a novel network model for RF-powered cognitive radio networks and ambient backscatter communications. In the network under consideration, each secondary transmitter is able to backscatter primary signals to the gateway for data transfer or to harvest energy from the primary signals and then use that energy to transmit data to the gateway. To maximize overall network throughput...
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.