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As a significant part of electrical load, air conditioners draw attentions for their sometimes-unfriendly load characteristics, especially their dynamic responses during grid voltage disturbances. In this paper, a novel under-voltage control strategy for variable-speed air conditioners is introduced, which can keep air conditioners load characteristic as constant impedances when unexpected voltage...
In Big Data Processing we typically face very large data sets that are highly structured. To save the computation and storage cost, it is desirable to extract the essence of the data from a reduced number of observations. One example of such a structural constraint is sparsity. If the data possesses a sparse representation in a suitable domain, it can be recovered from a small number of linear projections...
In this paper, a distributed coordinated tracking control problem for a group of nonholonomic chained systems has been discussed under the assumption that the desired trajectory is available only to a part of neighboring agents. First, coordinated tracking controllers under the directed communication topology graph containing a spanning tree are designed for two subsystems, adaptive control gains...
Non-blocking caches, which are commonly utilized in modern out-of-order processors, could handle multiple outstanding memory requests simultaneously to reduce the penalties of long latency cache misses. Memory level parallelism (MLP), which refers to the number of memory requests concurrently held by Miss Status Handling Registers (MSHRs), is an indispensable factor to estimate cache performance....
The vehicle trajectory dataset is often contaminated by GPS errors and low sampling rate. Consequently, it is important to cleanse the trajectory dataset before it can be used for any research or application. In this paper, we propose a HMM based system to cleanse and rebuild the missing traveling routes of vehicles in a given trajectory dataset. Considering the candidates of each entry as variables,...
Based on the study of advantages and disadvantages of the traditional AR model (autoregressive model) and the characteristics of failure rate prediction, an AR model based on neural network residual correction is proposed in this paper. The basic idea is to establish the AR model first to obtain the residual sequence, and next construct the neural network residual prediction model using the residual...
Co-designed radar-communication is becoming necessary, but there is a challenge to design suitable waveforms that can be simultaneously employed for information transmission and radar applications. This paper introduces the orthogonal frequency division multiplexing (OFDM) chirp radar waveform by embedding communication codes for co-designed radar-communication system from a top-level system description...
A wide spectrum of applications based on Internet of things (IoTs) are recently emerging and have drawn considerable attention. IoT-based multimedia (IoTMM) applications have received relatively less attention. This article provides a review of the field of mobile IoTMM systems; it assesses the state of the art and then discusses some active areas of ongoing research, particularly issues related to...
Coordinated tracking control problem is investigated for nonlinear multi-agent systems with time-delay and partly intermittent information transmission in this paper. When the directed communication topology has a spanning tree, the coordinated tracking control problem can be solved. The proposed delayed and partly intermittent coordinated tracking protocol can guarantee that each follower can track...
Frequency diverse array (FDA) radar produces a time-variant transmit beampattern depending on both the range and angle parameters, which offers potential applications in electronic countermeasure scenarios, especially in the presence of mainlobe jamming signals. However, the range and angle of targets cannot be unambiguously estimated by a standard FDA radar due to its range-angle coupling response...
Inspired by the frequency diverse array (FDA) producing range and angle dependent beampattern due to the employment of frequency increments across the array elements, this paper proposes a direction-dependent communications using 2-bit phase control across a two-element FDA antenna. The produced directional pattern projects the phase modulation signal as a constellation, which offers physical-layer...
Apart from basic orthogonality, cognitive multiple-input multiple-output (MIMO) radar waveforms should have the capacity of restraining spectral interferences in complex environment. Constant-modulus waveforms are also desired for the radio frequency (RF) amplifiers. Based on above considerations, this paper proposes an optimization method to design cognitive MIMO radar waveforms with constant modulus...
Different from the phased-array using the same radiation frequency for each array element, frequency diverse array (FDA) uses a small frequency increment across its array elements to produce range, time and angle dependent transmit beampattern. Nevertheless, it is necessary to optimally design the frequency increments for the specific applications. In this paper, we propose a frequency increments...
Frequency diverse array (FDA) antenna using uniform frequency increments produces a S-shaped range-angle-dependent transmit beampattern, which can provide more degrees of freedom (DOFs) to suppress the interferences with different ranges. However, the S-shaped beampattern is coupled in the range-angle dimension and consequently results in inaccurate target localizations. In this letter, we proposed...
Detecting the sinusoidal order is a prerequisite step for parametric multidimensional sinusoidal frequency estimation methods, whose applications range from radar and wireless communications to nuclear magnetic resonance spectroscopy. Although the Bayesian information criterion (BIC) has been commonly applied for model order selection, its application to sinusoidal order estimation is recent. By means...
Evaluating cache performance is becoming critically important to predict the overall performance of out-of-order processors. Non-blocking caches, which are very common in out-of-order CPUs, can reduce the average cache miss penalty by overlapping multiple outstanding memory requests and merging different cache misses with the same cacheline address into one memory request. Normally, memory-level-parallelism...
This paper proposes a novel method for two-dimensional (2-D) direction-of-arrival (DOA) estimation of multiple signals employing a sparse L-shaped array structured by a sparse linear array (SLA), a sparse uniform linear array (SULA) and an auxiliary sensor. In the proposed method, the elevation angles are estimated using the SLA and an improved MUSIC method. The azimuth angles are estimated by two...
Continuous-flow microfluidics rapidly evolved in the last decades as a solution to automate laboratory procedures in molecular biology and biochemistry. Therefore, the physical design of the corresponding chips, i.e., the placement and routing of the involved components and channels, received significant attention. Recently, several physical design solutions for this task have been presented. However,...
Flow-based microfluidic biochips have progressed significantly in the past decade. Thanks to innovations in multilayer soft lithography (MSL) fabrication technology, the integration of thousands of microvalves along with large-scale networks of microchannels on a chip has been enabled. This progress has even been compared to the evolution of VLSI circuits following Moore's Law. In flow-based microfluidic...
A 3D model watermarking against affine transformation is proposed in this paper. Firstly, the original watermark is embedded in an image, then we compare the watermarked image with the original watermark image and embed the watermark information into three-dimensional mesh model with distance between vertices and the center of a model. The algorithm has strong robustness against attacks, such as scaling,...
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