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The fractional-order has been studied as an alternative calculus in mathematics and many dynamical systems can be described by its differential equations. Grey theory is used to process the system when the information is partly known or the data samples are incomplete. Therefore, combining the advantage of grey and the fractional system will become a strong tool to estimate the real world. The purpose...
Existing researches on the theoretical analysis for Proportional Fair (PF) scheduling are mostly based on the full buffer assumption while the user always has a bursty traffic in reality. In this paper, an analytical framework for PF scheduling in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless network is proposed, and the user traffic is set to follow a poisson arrival process....
Indoor building environment for energy saving and human health has important significance and the main criterion for evaluating its quality is environmental comfort. An experimental scheme for obtaining the mathematical model of the main parameters is designed by analyzing the parameters that affect the environmental comfort. The scheme establishes a discrete bilinear model with parameters and control...
Lung cancer has been the deadliest among all other types of cancer. Our purpose is to propose an efficient method to detect the pulmonary nodules from CT images and classify the nodule into either cancerous (Malignant) or non-cancerous (Benign). We achieve this by framing the problem as a constructing classifier task and exploit data in the form of classifier to learn a mapping from raw data to object...
Fault-tolerant topology control is a critical problem in WSNs. It is important for improving network lifetime and reliability. In this paper, we present a novel algorithm FTMRT, which ensures Fault Tolerance by constructing a Multi-Routing Tree. We firstly construct a multi-routing tree of the initial topology, which ensures there are at least k-disjoint paths from each sensor to the set of supernodes...
The multi-user multiple-input single-output (MU-MISO) visible light communications (VLC) system, which can serve multi-users simultaneously, have been widely studied in recent years. Dimming control is one of the main topics in VLC systems. In this paper, we proposed a novel transmit antenna selection based spatial dimming (TAS-SD) scheme for zero forcing (ZF) precoded MU-MISO VLC systems. By taking...
Massive multiple-input multiple-output (MIMO) technology and millimeter wave (mmWave) communication are key technologies for the fifth generation (SG) wireless communications. The combination of mmWave and massive MIMO has the potential to dramatically improve wireless access and throughput performance. Such systems benefit from large available signal bandwidths and small antenna form factor. In the...
In visible light communication (VLC) systems, optical orthogonal frequency division multiplexing (O-OFDM) is an appealing modulation. Among many proposed O-OFDM schemes, both direct current biased O-OFDM (DCO-OFDM) and asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) are widely used. Since VLC needs to take the dual requirements of illumination and communication...
In this paper, a two-dimensional (2-D) direction-of-arrival (DOA) estimation method for a mixture of circular and strictly noncircular signals is presented based on a uniform rectangular array (URA). By exploiting the second-order non-circularity of incoming signals, a computationally effective ESPRIT-like method is developed to estimate the 2-D DOAs of mixed sources. The proposed method can automatically...
This paper summarizes the characteristics of the electricity load data collected every 15 minutes of power users. The single-day load data of single power user is taken as a 96-length vector, and the single-day data of n users is taken as a 96-column set. Single-user monthly data and annual data are described as a 30 (31) × 96 matrix and a 365 (366) × 96 matrix respectively. By comparing the wavelet...
Vehicle-to-Grid (V2G) is an emerging technology resulting from the emergence of Electric Vehicles (EVs) and Renewable Energy Sources (RES). The energy stored in battery packs of EVs are a solution to the intermittency of RES. Therefore, design and control design of charging infrastructure for EVs are of high importance for the development of V2G. This paper presents a wireless charging infrastructure...
Locality sensitive hashing (LSH) and its variants are widely used for approximate kNN (k nearest neighbor) search in high-dimensional space. The success of these techniques largely depends on the ability of preserving kNN information. Unfortunately, LSH only provides a high probability that nearby points in the original space are projected into nearby region in a new space. This potentially makes...
Ships stability and safety are always threatened by the unavoidable sway in the complicated situation of the sea, e.g. strong wind and roaring waves. Ensuring the stability of the ship as a difficult task has received its popularities in the community in the past few decades. However, conventional control methods such as sliding mode control (SMC) and Proportional integral derivative (PID) fail to...
Benefiting from its high scalability and high reliability, Hadoop has become a popular big data processing platform at present. Hadoop Distributed File System (HDFS) which is one of the cores of Hadoop can efficiently store large files. However, massive small files stored in the HDFS cause the “small files problem” due to the bottleneck of NameNode memory and access performance. To solve the defect...
In order to improve fault recovery characteristic of high-voltage direct current transmission system(HVDC), this paper proposes voltage dependent current order limiter(VDCOL), optimizing arc extinguishing angle controlling and adopting SVC reactive power compensator and so on to improve fault recovery feature after analyzing the main factors influencing fault recovery characteristic. This paper makes...
This paper studies the structure features of the collected power consumers' power consumption data, in which the 96 measured data points indicating a single user's power consumption curve of a day. The 96 measured data points are taken as 96 variables for analysis. The dimensionality of original data is reduced by principal component analysis (PCA), and then the K-means algorithm is employed to cluster...
We consider the problem of spectral compressed sensing in continuous domain, which aims to recover a 2-dimensional spectrally sparse signal from partially observed time samples. The signal is assumed to be a superposition of s complex sinusoids. We propose a semidefinite program for the 2D signal recovery problem. Our model is able to handle large scale 2D signals of size 500 × 500, whereas traditional...
In this paper the performance of TM21 resonance-mode circular patch antennas embroidered with different stitching patterns is discussed and compared. The goal is to investigate the difference in the performance when the antenna is embroidered with stitches following the antenna current paths as opposed to some simple patterns such as horizontal and vertical ones. This creates an alternative solution...
The energy consumption of cellular networks has increased dramatically due to high demand for wireless communication. Base-stations (BSs) use about 60% to 80% of the energy consumed by these networks. An attractive way to reduce energy consumption is to turn the BSs off during periods of under-utilization. However, turning a BS back on typically consumes a lot of energy, which has not been considered...
This paper proposes a balancing strategy to improve the balancing performance of series-connected lithium-ion batteries. The key point of the proposed strategy is to control the change rate of state of charge (SOC) of different batteries to be equal so that imbalance can be prevented from emerging and expanding. With this strategy, the discrepancy of real maximum capacity in aged batteries can be...
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