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Color mapping for 3D models with captured images is a classical problem in computer vision. Typically, registration between 3D model and images is assumed to be provided, otherwise corresponding points need to be labeled. For many applications, 3D model and images are acquired from different devices, since registration cannot be directly obtained, manual labeling has to be adopted. In this paper,...
Economic Denial of Sustainability (EDoS) attacks have been threatening cloud consumers' financial viability due to the “pay-as-you-go” cloud resource charging scheme. EDoS attackers can take advantage of this pricing scheme to fraudulently consume the billable cloud resources from the cloud consumers and thus, drive up the cloud consumers' financial cost and eventually disrupt their economic sustainability...
Aiming at the problem of five-level modulation strategy, which is numerous and difficult to be unified, a general modulation strategy based on phase-disposition is proposed. The proposed method is unified with the different modulation strategy by adding zero-sequence voltage on the modulated wave or changing the phase of staking carrier. To verify its correctness, using the proposed method to achieve...
In view of LCL-type grid-connected inverter system, traditional methods can hardly realize multigoal analysis and optimization, thus, a research is carried out on the visualization method based on D-partition method. In consideration of the discrete characteristic of digital control, this paper infers the establishment conditions of D-partition method in z domain, and compares it with D-partition...
The performance of interior permanent magnet synchronous motor (IPMSM) drive system is affected by parameters variation and digital control delay, which increases the difficulty and complexity of analyzing and designing, a visualization technique is proposed in discrete time domain. First of all, D-partition method is used to obtain stable region of IPMSM current loop, while the sampling & computation...
As one of the major radio-frequency impairments in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system, in-phase and quadrature-phase (IQ) imbalance tends to destroy the reciprocity between uplink and downlink channel based on time-division duplex (TDD) mode and deteriorate system performance. In this paper, a time-domain calibration scheme is proposed to...
With the development of renewable energy, the influence of photovoltaic power plant on power grid is increasing. In order to study the influence of large-scale photovoltaic power plant on power system, it is necessary to establish a centralized equivalent model of large-scale photovoltaic power plant composed of many power generation units to avoid the problem that simulation time is too long. In...
For interior permanent magnet synchronous motor (IPMSM) drives, high-frequency (HF) rotating voltage signal injection method is widely employed to estimate the initial rotor position. However, conventional demodulation method based on current phase is complex and susceptible to filters and digital control delays, an amplitude demodulation algorithm is proposed in this paper. With the proposed method,...
In the 3D massive MIMO system, both the transmitter encoding and the receiver signal detection require channel state information. The accuracy of channel state information will directly affect the overall performance of the system. Therefore, accurate channel estimation is the key to reliable communication in the 3D massive MIMO system. Due to the channel sparsity of 3D massive MIMO, existing works...
Recent studies have indicated that there are significant changes in physiological signals among multiple emotions. This work aimed to study the differences of heart rate variability (HRV) indices among multiple emotions, and thus to explore the consistency of the differences within and without individuals. Sixty healthy students were involved in this study. Electrocardiography (ECG) from each subject...
Nonlinear loads connected to the microgrid distort the voltage of the Point of Common Coupling (PCC) and the grid current. Therefore, A droop control based harmonic voltage compensation strategy of voltage controlled inverter in islanded/grid-connected mode is proposed in this paper. To compensate the PCC voltage distortion, fundamental and harmonic voltage components are controlled separately in...
We present a novel absorber based on a periodic array of parallel-plate waveguide. With the assistance of a layer of lumped circuit that consists resistors, capacitors on top the parallel-plate waveguide, the absorber designed working at microwave L, and S band performs high absorption in a broadband frequency range. The reflectivity of −10dB covers the frequencies 1.4–5.5 GHz with relative absorption...
The acoustic microstreaming originating from microbubbles' linear oscillations can be used as a potential cell sonoporation tool for drug delivery and gene transfection. However, this bubble-based method suffers from bubble instability, non-uniform size, unreliable performance, and inconvenient trapping. In order to overcome the above drawbacks, in this study, we proposed a massive drug delivery method...
Acoustic lenses, concentrating the acoustic energy into a specific area, have attracted interest due to their broad applications in various domains, such as biomedical imaging, nondestructive testing, etc. For waterborne sound, conventional silicone materials are fabricated with concave shape for focusing wave. However, it is not flexible to design a concave lens than a flat lens to manipulate acoustic...
Nanoparticle manipulation has a variety of potential applications, from two-dimensional material fabrication to biomedical engineering. Pattern and transportation of nanoparticles has been receiving increasing attention in recent years. Ultrasound as a mechanical wave has proven to be the most effective in the manipulation of micro-objects in a non-contact and non-invasive fashion. However, due to...
We numerically report a high efficient acoustic lens using a flat artificial composite plate in water, which is designed using silicone films deposited on PMMA plate engraved with the annular grooves. The focusing effect is due to the phase of the plate changing with the height of PMMA variation, while the total height of the plate is held constant. As both PMMA and silicone are low impedance mismatch...
Piezoelectric materials are at the heart of electromechanical devices, such as medical imaging transducer, high intensity focused ultrasound (HIFU), industrial nondestructive evaluation (NDE) and piezoelectric sensors, to name a few. In this presentation, the advantages and disadvantages of piezoelectric materials are discussed based on the requirements (figure of merit) of various applications, with...
The pattern recognition in the sparse representation (SR) framework has been very successful. In this model, the test sample can be represented as a sparse linear combination of training samples by solving a norm-regularized least squares problem. However, the value of regularization parameter is always indiscriminating for the whole dictionary. To enhance the group concentration of the coefficients...
The performance conditions of steam turbine regenerative system have important influence on the safety and economy of the units. It is of great significance to doing the research on the performance monitoring of the regenerative system to ensure the safe and economical operation of the whole coal-fired power plants. In view of the shortcomings of the complexity of traditional performance monitoring...
Gas turbine combustion system (GTCS) works in the highly adverse environmental conditions of high temperature and high pressure. Because GTCS initial temperature is too high to be directly measured, exhaust gas temperature (EGT) is an alternative to detect performance of GTCS. However, various interferences, such as working and ambient conditions as well as compressor and combustion efficiencies and...
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