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.
Detecting community structure in epidemics networks is crucial for the assessment of epidemic dynamics and effective control of disease spread by targeting at the individuals bridging communities. Common community detection models (e.g., cut-criteria and modularity-criteria based model) are efficient in optimal quality of network partitions. However, most of the approaches fail to consider the dynamic...
This paper presents a scheme for rotor position estimation from standstill to nominal speed for slotless surface mounted permanent magnet synchronous motors, which do not contain structural anisotropy. At standstill and very low speed, the position is estimated by signal injection, while the rotor polarity is identified by a special process based on the estimation of the back electromotive force (back-emf)...
In this study, we demonstrate that the performance may be undermined in the state-of-the-art intra-SM sharing schemes for concurrent kernel execution (CKE) on GPUs, due to the interference among concurrent kernels. We highlight that cache partitioning techniques proposed for CPUs are not effective for GPUs. Then we propose to balance memory accesses and limit the number of inflight memory instructions...
This paper reports the electrostatic regulation of surface traction of a quadruped soft robot to improve its locomotion efficiency. The soft robot, containing five pneumatic channel networks (PneuNets) in different parts of its body, is actuated to achieve undulated locomotion. Electrostatic adhesion is applied to the bottom surface of each robot leg, by using a thin elastomeric adhesion pad embedded...
Morphological structure has a decisive influence on the microwave absorbing properties of three-dimensional (3D) nano zinc oxide whisker (ZnOw) material. However, due to the complexity of the microstructure, it is still a difficult challenge to develop a fast and accurate optimization method for this kind of nanostructured material. Hence, as an attempt, we enhance the generality of our optimization...
In this paper, a power dependent nonlinear square loop FSS which provides transmission at low power and reflection at high power is proposed. The nonlinear property of this structure is realized by utilizing the nonlinear property of diodes as the diode can have ‘on’ and ‘off’ state at high and low power level, respectively. To have a accurate estimation of the property of diodes and study the performance...
The background of this paper is the issue of how to overview the knowledge of a given query keyword. Especially, we focus on concerns of those who search for Web pages with a given query keyword. The Web search information needs of a given query keyword is collected through search engine suggests. Given a query keyword, we collect up to around 1,000 suggests, while many of them are redundant. We cluster...
With the increasing trend of the number of the network text, the research on the sentiment classification of Web texts is becoming a hot issue. Based on the analysis and research of some existing classification methods, this paper proposes an optimization method based on the prior knowledge of the text topic. First, we pretreat the text of the corpus. Then the emotional polarity value of the text...
In this paper, a neural network approach is proposed for air quality forecasting based on the air quality time series itself as well as external meteorological records. A regularized version of the Extreme Learning Machine is used as the main model for the forecasts and feature selection is performed to select the most relevant model inputs. The proposed method is evaluated under different approaches...
GPUs are widely used to accelerate general purpose applications, and could hide memory latency through massive multithreading. But multithreading can increase contention for the L1 data caches (L1D). This problem is exacerbated when an application contains irregular memory references which would lead to un-coalesced memory accesses. In this paper, we propose a simple yet effective GPU cache Bypassing...
In this paper, the transfer matrix of lumped parameters is established by the finite element calculation to reflect the thermal characteristics around the cable. It can adapt to different heat dissipation conditions, so as to realize the fast calculation of steady temperature rise for multi-circuit cables with multi boundary conditions under different working conditions, which provides ideas for future...
In this paper, taking parameters measurement for grounding grids of the 1000kV ultra-high-voltage (UHV) Suzhou substation as an example, it introduces the basic situation about the designed grounding grids, the methods used to measure the power frequency (50 Hz) ground resistance (PFGR) and impulse grounding impedance (IGI), respectively. The PFGR data are analyzed and checked which were measured...
In the deregulated electricity market, retailers owning distributed generation (DG) can not only gain electricity from their own DG, but also can purchase electricity from the wholesale market and the bilateral contract market. Usually, severe uncertainties are existed in the outputs of DG and the wholesale prices. In order to guarantee retailers to achieve a satisfactory risk-return target, this...
This paper discusses a decentralized energy management for an engine-generator/battery/ultracapacitor (UC) hybrid energy system with fault tolerance analysis. The energy management problem among the energy suppliers and the load is formed into a non-cooperative power distribution game where the engine-generator, the battery pack, the UC pack, and the load are modeled as independent and related players...
This paper provides a two-level energy management strategy for a fuel cell-battery-ultracapacitor (UC) hybrid system. In the proposed strategy, the battery and UC packs are seen as an energy storage system (ESS) at the first level and the equivalent consumption minimization strategy is used to distribute load power between this ESS and the fuel cell system. The penalty factor is tuned based on estimated...
High frequency wireless power transfer (WPT) such as working at megahertz (MHz) is widely considered to be a promising candidate for charging the lithium-ion batteries of mobile electronic devices. However, in a real battery charging application, the varying battery voltage and charging current will significantly affect the system efficiency and lead to the high power loss in the whole charging process,...
A new method for transient overvoltage (TOV) measurements in 500kV power system using capacitor voltage transformers (CVTs) is introduced in this paper. It is realized with a voltage sensor installed within the CVT as the low-voltage capacitor C3 connection in series with the high-voltage (HV) capacitor C1 and the median-voltage capacitor C2. Simulations studies and laboratory tests in manufactory...
For obtaining impulse impedance characteristics for grounding device of UHV 1000 kV transmission tower, a portable instrument is used as the incident wave source to the grounding device, which stably outputs a 8/20 μs standard lightning current with simultaneous measurement of the response transient voltage. Tests and date recording were done to some standard resistances with nominal values, and a...
Partial discharge (PD) is one of the major causes of insulation degradation/ageing in power equipment, it is significant to detect PD accurately for guarantee equipment's safety and reliable operation. To achieve an accurate PD monitoring and PD location, a new type of PD on-line monitoring system was presented in this paper. The PD phenomena taking place of equipment's surface and/or interface was...
In this paper, we report a 3D-printed portable microindenter for measuring the mechanical properties of soft materials. The system is composed of three major components: (i) a Z-axis stage, (ii) a force-sensing indentation probe, and (iii) a data acquisition and control system. We construct most of the system parts (including the force sensing probe) by 3D printing, and perform mechanical design and...
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.