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To acquire reliable medical ultrasound images and accurately detect vascular diseases, it is inevitable to improve axial resolution and contrast facilitating clearly definition of depth and thickness of blood vessel walls.
Sentinel lymph nodes (SLNs) are the first draining lymph nodes when metastatic cancer cells are spreading. Sentinel lymph node biopsy (SLNB), which is performed invasively, is the current standard treatment to determine whether the cancer cells are spreading or not. A non-invasive SLN imaging modality along with fine needle aspiration biopsy (FNAB) would be beneficial for staging the axillary lymph...
Recently, magnetomotive ultrasound (MMUS) imaging has been introduced to detect magnetic nanoparticles (MNPs) which are not able to be visualized by conventional B-mode ultrasound. However, to date, only forward-mode MMUS where the imaging object is placed in between an ultrasound probe and an electromagnet is implemented in the literature. Such a MMUS mode is not suitable for clinical use. To facilitate...
Recently, magnetomotive ultrasound (MMUS), which is capable of ultrasonic visualization of in vivo magnetic nanoparticle distribution challenging to conventional B-mode ultrasound, has shown its potential in extravascular ultrasound molecular imaging, magnetic nano-drug delivery monitoring, and sentinel lymph node identification. However, to date, only forward-mode MMUS where the imaging object is...
Shear wave elastography relies on acoustic radiation force to generate shear wave vibration. In magnetomotive ultrasound (MMUS), magnetic excitation along with magnetic nanoparticles (MNPs) induces magneto-vibration. Both types of tissue vibrations are in the range of few micrometers and not observable in conventional B-mode imaging. Computationally intensive sub-wavelength motion tracking is required...
Shear wave elastography relies on acoustic radiation force to generate shear wave vibration. In magnetomotive ultrasound (MMUS), magnetic excitation along with magnetic nanoparticles (MNPs) induces magneto-vibration. Both types of tissue vibrations are in the range of few micrometers and not observable in conventional B-mode imaging. Computationally intensive sub-wavelength motion tracking is required...
In this paper, we propose the frequency domain minimum variance (MV) method plus coherence factor (CF) weighting technique to improve the axial resolution of medical ultrasound images. The minimum variance beamformer is originally proposed to apply over aperture domain data to improve lateral resolution. Via the help of spectral whitening, the MV method can be applied to the frequency components which...
The uplink spectrum of cellular networks is often underutilized due to the asymmetric behavior of wireless data services. To enhance the efficiency, a full-duplex (FD) cellular system is proposed to reuse the uplink spectrum for concurrent uplink and downlink transmissions. By jointly designing transmit beamforming and power control, a weighted sum-interference power minimization problem is formulated...
In this paper, a distributed Dual-Ring Tree scatternet formation is proposed to generate a reliable topology for Bluetooth networks. To mitigate the formation complexity, each root distributively connects with its downstream roots with local topology instead of global nodes information, instructs them to connect together, and generates a desired dual-ring subnet via distributed computation with three...
In this paper, two hybrid multi-hop/single-hop opportunistic transmission strategies for lifetime extension of WSNs are proposed. To prolong the network lifetime, a systematic model that contains a network distribution block, a routing algorithm block, a traffic pattern block and an optimal policy block is presented to determine the optimal transmission probability of each node. With the global routing...
This paper focuses on the loss analysis and optimized design of DC-DC converter for battery module. By using the data measured from the experiment study of inductor loss and component datasheets to derive the inductor, MOSFET, and capacitor loss equations of bidirectional buck converter, boost converter, and buck-boost converter through numerical analysis. In addition, the charging and discharging...
This study presents an infant emotion recognition system using visual and audio information for infants aged 1 to 7 months. The system is divided into two parts, image processing and speech processing. The image processing part detects the infant's face and extracts facial expressions features. In the face detection stage, the system selects the largest skin color region as the facial area, while...
Since PWM signal is hard to express with formulation in time domain while it is simple in the frequency domain and taking the frequency dependence of the system into consideration, this paper establishes a new way to the reconstruction of PWM signal from frequency domain to time domain. It uses double Fourier transform to decompose the PWM signal in frequency domain, then gets terminal waveforms by...
In this paper, a new model for calculating the crosstalk of wiring harness is established and this model is named discrete-rotary model. The results of the proposed model are confirmed by Finite-Difference Time-Domain (FDTD). The traditional model is imprecise and limitations because of the little sampling when to calculate the twisted-pair cable crosstalk. So the final update equations are build...
In this paper, energy-efficient resource allocation algorithms are investigated to improve the energy efficiency (EE) in two-way multi- carrier amplify-and-forward (AF) relay networks by ensuring the quality-of-service (QoS) and balancing the EE of the user links. We formulate an EE-balancing optimization problem that maximizes the ratio of the spectral efficiency (SE) and the total network power...
In this paper, nanoscale germanium (Ge) fin etching with inductively coupled plasma (ICP) equipment by Cl2/BCl3/Ar gas is experimentally demonstrated. The impact of Cl2/BCl3/Ar gas ratio on etching induced Ge surface roughness, etch rate, sidewall steepness, uniformity and layout dependence are comprehensively investigated. The surface roughness is improved by increasing Ar flow rate. A nearly vertical...
In this paper, an improved method based on the Gauss-Legendre quadrature and Unscented Transform (UT) is proposed to estimate the statistical characters of the EMC/EMI problems with stochastic parameters. The UT method provides a fast method to propagate mean and covariance information through nonlinear transformations. The Gauss-Legendre quadrature as an efficient numerical integral method is used...
The new application of ultrasonic imaging to transient elastography has triggered the emergence of high frame-rate imaging. Using plane wave excitation (PWE), a single insonification is sufficient to form an image; thus PWE is one of the methods for achieving high frame-rate imaging. However, due to the lack of transmit focusing, the signal-to-noise-ratio (SNR), contrast, and spatial resolution of...
Plane wave imaging is generally performed using linear array transducers which array pitch is larger than one wavelength, resulting in grating lobe artifacts. In addition, larger element width associated with linear array transducers reduces delay accuracy for delay-and-sum based plane wave beamformation and therefore causes higher sidelobes and lower imaging contrast. To suppress both of the artifacts,...
In this paper, the hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method is proposed for efficient simulation of graphene-based frequency selective surfaces (GFSS) at Terahertz band, with the Drude model of monolayer graphene and associated auxiliary differential equation (ADE) technique implemented into the numerical methods for solving the Maxwell's equations. Numerical simulations...
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