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Two-dimensional phase unwrapping (PU) is a key technique in many scientific fields. In this paper, the L1-norm-based PU is implemented via a novel method, which is simpler than the classic minimum-cost network flow (MCF) method. It is proved that the network associated with the PU problem can be simplified to a weighted bipartite graph, and matching this graph can solve the PU problem with higher...
In this paper, a fast time-domain image formation method called the fast backprojection algorithm (FBPA) is proposed for the one-stationary bistatic circular synthetic aperture radar (OS-BCSAR) data processing. It represents the subimages in the elliptical polar grids to reduce the computational load. First, the imaging geometry of the OS-BCSAR is provided. Then, based on the subaperture processing...
A fast raw signal simulation method based on the equivalent scatterer and subaperture processing for the one-stationary bistatic synthetic aperture radar (OS-BSAR) is presented. It considers the radar's motion error to simulate the more accuracy raw signal. First, the OS-BSAR geometry is built in elliptical polar coordinate, and then the scene is divided into several equidistant elliptical rings....
The micro-Doppler feature is one of the most prominent information for target classification and identification. This paper pays attention to the problem of outdoor moving human micro-Doppler feature extraction. The Hough transform (HT) is implemented to extract the moving trajectory in slow time-range image. An aligned matrix which contains the human micro-motion information is achieved by selecting...
A suite of codes, named Microwave Tube Simulator Suite (MTSS), will be presented. MTSS is a full-featured tightly integrated software package for vacuum electron devices analysis and design. It includes a commercial grade user interface and three physics simulators. The Electron Optics Simulator (EOS) is a finite-element two dimensional and three dimensional electrostatic steady-state beam trajectory...
External electrical cardioversion has been used as a therapeutic option to terminate atrial fibrillation (AF) and restore sinus rhythm (SR). However, identifying patients who would benefit from this therapy is still an active area of research. In this study, we develop new time-frequency features to characterize the atrial activity (AA) and to predict the success of electrical cardioversion therapy...
This paper proposes a hybrid method combining support vector regression (SVR) and fuzzy inference method for one-day ahead hourly forecasting of photovoltaic (PV) power output. The proposed method comprises training stage and forecasting stage. In the training stage, a number of SVR models are used to learn the collected input/output data sets. To achieve accurate forecast, the fuzzy inference method...
This research provides a new approach, laser interference lithography (LIL), to fabricate PSS and NPSS. Yet, there are two ways to pattern hexagonal 2D array on sapphire by LIL. First is multi-exposure LIL, and the second is multi-beam LIL. In conclusion, simulation results in this research may have verified that multi-beam LIL has significantly better throughput than multi-exposure LIL; the result...
Temperature and strain sensitivities of fiber Bragg grating inscribed in silica-germanate fiber are experimentally investigated. Thanks to the different sensitivities of individual resonance peaks, the configuration has the potential to measure these two parameters simultaneously.
The development of a thinner core (:5100um) laminate array based exposed die fcCSP package with package to die area ratio > 12, package total height maximum 0.77mm that meets the JEDEC < ±100um warpage requirement is discussed. The same approach used for the 150um thick core exposed die fcCSP technology was used for this work, namely finite element modeling to guide the choice of mold compound...
To deal with the shortage of 3He gas, which is widely used in thermal neutron detection, the boron coated straw-tubes have been developing to replace the 3He proportional counters. We present in this paper the realization process of a straw tube with 1 m long and the diameter is 4 mm, with 1 µm B4C layer coated on the inner surface to convert neutrons to charged particles.[1] The parameters, high...
This study is designated to experimentally determine the effect of clean dry air (CDA) purging rate on purging efficiency in a beta version 450 mm PC FOUP, which fully loaded with 25 pieces of dummy wafers. The purging CDA with flow rate range of 30~180 L/min (LPM) were tested. The purging gas enters the FOUP through the two rear ports. For each case, a total purging time of 30 minutes was set to...
This study investigated the effects of adding 1 wt.% nano-TiO2 particles into low-Ag content Sn0.35Ag0.7Cu (SAC) lead-free solder alloys on the growth of intermetallic compounds (IMC) with Cu substrates during solid-state isothermal aging at temperatures of 125, 150, and 175 °C for up to 7 days. The results indicate that the morphology of the Cu6Sn5 phase transformed from scallop-type to layer-type...
With the increase of national income, the public presents increasing demands on travel. In addition to self-planning, the public could select the package tours arranged by travel agencies, in which tour buses are the major transportation. About 40 people can be carried in a tour bus. Before departure, the tour guide has to clearly control the number of people. Such an action is repeated in the journey...
Thanks to the MEMS and SoC technologies, the wireless sensor networks (WSN) enabled inertial sensor node (ISN) can be implemented on a very small printed circuit board (PCB). A miniaturized printed monopole antenna with metallic grid is proposed for the small ISN. The binary particle swarm optimization (PSO) is employed to find the optimized configuration of the metallic grids with the specified bandwidth...
In this paper, we have demonstrated that cryogenic implantation applied to source and drain (SD) extension, pocket/halo and SD formation offers advantages for higher core and SRAM driving current and one order lower Ioff bulk (Ioffb) leakage in NMOS with reduced SRAM defectivity. Atomistic Kinetic Monte Carlo (KMC) modeling confirms that the cryo-implantation has enabled a unique control of active...
In this paper, we present an application of the Floquet-Bloch theorem in the context of electrodynamics for vibroacoustic power flow optimization by mean of distributed and shunted piezoelectric patches. The main purpose of this work is first to propose a dedicated numerical approach able to compute the multi-modal wave dispersions curves into the whole first Brillouin zone for periodically distributed...
We report a MEMS-based tunable grating optical filter device and its integration with a fluorescence microscope system. This integration allows for voltage-controlled wavelength tuning of excitation light from a multi-band source. We demonstrate the system's capability to selectively excite fluorescence protein molecules with different excitation/emission spectral characteristics using a chip of optical...
In this paper we present an overview of work carried out to design, manufacture and test a corrugated waveguide section for a feedhorn, suitable for a reflector antenna to receive digital satellite television. A system has been designed to carry circularly polarized waves in a two concentric waveguide system. Waveguide transitions are also designed, constructed and tested in linear polarization to...
Osteoporotic patients occur frequently fragile fractures, and femoral fractures are the common traumatic injuries in the elderly. Although wires are often used through trials-and-errors for unstable femoral proximal fractures with DHS fixation clinically, there is no efficacy wire fixation technique available due to the lack of biomechanical study. FEM is applied to analyze the stress and strain distribution...
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