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Grid operators are tasked to balance the electric grid such that generation equals load. In recent years renewable energy sources have become more popular. Because wind and solar power are intermittent, system operators must predict renewable generation and allocate some operating reserves to mitigate errors. If they overestimate the renewable generation during scheduling, they do not have enough...
In public cloud networks, applications of different tenants compete for the shared network bandwidth and thus might suffer from unpredictable performance. It is desirable for cloud providers to offer tenants with bandwidth guarantees. However, it is challenging to precisely abstract tenant bandwidth requirements for their intra- and inter-tenant communications and to achieve work conservation simultaneously...
In this paper, to study rum or spreading model for the web forum of which the topological structure has a strong heterogeneity, we propose a novel susceptible-exposed-infected-removed (SEIR) model by introducing the importance and fuzziness of the content of the rum or. We derive mean-field equations characterizing the dynamics of the SEIR model on heterogeneous network. Then a steady-state analysis...
Scattering amplitude coefficient of the chaff cloud is still an open problem. In this paper, an improved physical model was proposed to facilitate the calculation of the scattering amplitude matrix of the chaff cloud. In which the chaff cloud is random distribution, the chaff is random orientated, the incident and the scattering direction are respectively random polarization and the direction of incident...
Uplink sum power minimization problem with required Quality of Service (QoS) under statistical Channel State Information (CSI) and probabilistic constraints in solved for a multicell multiuser scenario. To handle the probabilistic constraints and analyze the system performance, financial risk management measures Value at Risk (VaR) and Conditional Value at Risk (CVaR) are applied. The resulting expressions...
This paper proposes a modified version of opinion communication based on naming game to simulate the formation of opinion in real society. In the version, freshness is brought in to measure memory level of one opinion for each agent, when various opinions exist in social population. Main researches are devoted to new opinion replacing old opinion after system already convergences to an opinion, revealing...
In this work Barium Titanate- Polyvinylpyrrolidone (BaTiO3/PVP) composite nanofibers are synthesized via electrospinning with sol-gel precursor. BaTiO3 nanofibers are obtained after calcinning the composite at 960 °C for 20 h. The morphology and crystal structure of the electrospun composite nanofibers are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and FT-IR analyses...
This paper considers the problem of the dynamic router node placement (dynRNP) with weighted clients in wireless mesh networks (WMNs), in which both mesh clients and mesh router have mobility, and mesh clients can switch on or off their network access at different times. The main objective of the conventional dynRNP problem is to maximize both network connectivity and client coverage, i.e., the size...
In step with the web being used widely by mobile users, user location is becoming an essential signal in services, including local intent search. Given a large set of spatial web objects consisting of a geographical location and a textual description (e.g., Online business directory entries of restaurants, bars, and shops), how can we find sets of objects that are both spatially and textually relevant...
While the use of a communication network facilitates the development of cooperative control for networked systems, it comes at a price that the systems become vulnerable to data attacks by an adversary. In this paper, we consider consensus dynamics on networked systems with strongly connected directed graphs in the presence of an additive stealthy attacker. The attacker has a linear dynamics and can...
An improved large-signal model for intrinsically tunable and switchable ferroelectric FBARs is presented. Ferroelectric FBARs based on multifunctional materials such as BST possess electric-field-tunable permittivity and electric-field-induced piezoelectricity. These properties are promising for the design of a new class of high-power reconfigurable RF devices for frequency-agile radios. Availability...
Sampling and reconstruction (S&R) are used in virtually all areas of science and technology. The classical sampling theorem is a theoretical foundation of S&R. However, for a long time, only sampling rates and ways of the sampled signals representation were derived from it. The fact that the design of S&R circuits (SCs and RCs) is based on a certain interpretation of the sampling theorem...
LDPC codes can be constructed by tiling permutation matrices that belong to the square root of identity type and similar algebraic structures. We investigate into the properties of such codes. We also present code structures that are amenable for efficient encoding.
This document compares global bundle adjustment via the ubiquitous Levenberg-Marquardt to a Kalman filter to estimate parameters of a homographic transformation between two or more images starting from bad initial conditions. We show that the filtering technique outperforms sparse bundle adjustment in terms of projection error and computational costs. The techniques are tested on real world images...
An immunization strategy is often defined as the choice of a set of individuals who cannot catch nor transmit the disease. The choice is mainly based on the attributes of nodes in the network topology. In BA networks, the spread threshold value of virus is very small, and decreases with the increase of network scale. If the scale of BA network is infinite, the spread threshold value of virus is zero...
In this paper, we propose an effective algorithm to estimate orientation angles (roll, pitch, and yaw) from Inertial Measurement Unit (IMU). This algorithm uses two adaptive extended Kalman filters (AEKF) to estimate the Direction Cosine Matrix (DCM), the external acceleration and the magnetic disturbance. First 6-state filter estimates three elements in the third row of the DCM and the external acceleration...
Clustering is the process of organising data into meaningful groups, and these groups are called clusters. It is a way of grouping data samples together that is similar in some way, according to some criteria that you pick. Swarm intelligence (SI) is a collective behavior of social systems like insects such as ants (ant colony optimization, ACO), fish schooling, honey bees (bee algorithm, BA) and...
The development of temporally consistent land cover time series from satellite-based earth observation has proven difficult due to variability in sensor observations. This leads to spurious land cover differences between maps when standard supervised classification approaches are applied. To reduce this effect, a common solution has been to first detect change and update a base map for only these...
Based on the complex network theory, this paper proposed an energy-aware Barabasi-Albert (EABA) model for wireless sensor networks (WSNs). Unlike existing research, tunable coefficients were introduced into the model for balancing connectivity and energy consumption in the network. Mean-field approach was applied to study the degree distribution of EABA. Both theoretical analysis and simulation indicate...
In the framework of LPV and qLPV controller design one often encounter the problem of finding a maximal negative graph subspace of a parameter dependent non-singular indefinite matrix. For practical reason it is necessary that these subspaces depend continuously on the parameters. The paper provides an exhaustive condition for the existence of such a continuous solution.
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