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We report that 202.8 J output energy from a 150-mm-diameter Ti:sapphire amplifier was achieved with 320 J pump energy. A temporal dual-pulse pumped scheme was used to suppress the transverse parasitic lasing.
We demonstrate electro-optic modulation on a monolithic lithium niobate nanophotonic platform up to 40 Gb/s. We show electro-optic efficiency as high as 7 pm/V in microresonators and half-wave voltage length product as low as 2 Vcm in micro-Mach-Zehnder interferometers.
Single-carrier frequency-domain equalization (SC-FDE) occupies a concise transmitting structure and a low peak-to-average power ratio (PAPR). These advantages are conducive to the miniaturization of the satellite systems and increase the robustness to the non-linear distortion of amplifiers. Nowadays, satellite communication systems set out to work at Ka or higher frequency bands to support the high...
In this paper, we proposed a half-wave plate, which works at millimeter-wave band, based on a field transformation(FT) method with wide incident angle and broad working bandwidth. The proposed waveplate is composed of periodically arranged two dielectric layers with sub-wavelength heights. The effective electromagnetic(EM) parameters of the proposed waveplate can be tuned by manipulating the heights...
This paper presents a calibration technique based on missing-code-detection (MCD) scheme to correct the gain error between the MSB and the LSB array in SAR ADCs with bridge-DAC structure. The MCD algorithm replaces the gain factor calculation with simple missing-codes count that significantly reduces the calibration digital overhead. It also relieves the linearity requirement of the testing signal;...
This paper proposes an automatic assisted device for Neuro-Developmental Treatment (NDT). NDT rehabilitation is effective for stroke patients, but it is also labor-intensive for therapists. Consequently, patients cannot receive sufficient training because of the lack of therapists' assistance. Therefore, we develop an automated NDT trainer that can help reduce the therapists' workload and increase...
This paper describes two approaches to increase the energy efficiency of on-chip terahertz (THz) integrated circuits and systems. First, we present designs of multi-functional electromagnetic structures that utilize mode orthogonality and near-field interference to achieve simultaneous oscillation, harmonic generation, signal filtering and radiation. This leads to ultracompact THz circuits with low...
Fall detection for the elderly is in great demand in order to mitigate the effect of falls. As fall detection system is a safety shield on which people's lives depend, high detection sensitivity is always the pursuit of fall detection system. Previous works prove that the sensitivity is correlated to the type of detection features. But generating personalized optimal detection features is difficult...
In this paper, an extreme learning machine based Hammerstein-Wiener(H-W) model is built to identify continuous Stirred Tank Reactor(CSTR) nonlinear system. In the proposed H-W model, the two nonlinear blocks are described by two different extreme learning machine neural networks. The model parameters identification is achieve by generalized least square algorithm. The propose method can obtain more...
For long, online learning has received criticism on not being able to provide helpful insight on students' learning, for a lack of necessary and appropriate interaction between instructor and students. Despite the fact that learning analytics (LA) are on the rise in terms of their popularity in academic institutions, the usefulness of LA come into question, especially the elements intended to provide...
Solving electromagnetic (EM) scattering by very slim conducting objects could be challenging in integral equation approach because the polarized current density tends to be singular near the edges of such objects and many low-quality meshes exist when discretized. Traditionally, the problem is formulated based on electric field integral equation (EFIE) by approximating the objects as two-dimensional...
This paper presents a standardized quality criteria to evaluate the 3D point cloud model of the indoor building which is based on point cloud's data accuracy, the prior characteristics of the building and the coincidence errors of the point cloud model. Our assessment framework involves three steps: the point cloud data acquisition, model generation and quality evaluation. In model generation progress,...
Airborne acquisition and ground-view 3D point cloud provide complementary 3D information at city scale. A complete but lacks ground-view details, while the latter is incomplete for higher floors and severe occlusion. In this paper, First, a volumetric fusion method based on graph cuts were applied for fusing of airborne and terrestrial 3D LiDAR data. Second, we propose a method of constraints based...
In this paper, we propose a novel approach for road width measurement from high resolution satellite or aerial images. The proposed approach has three main steps. First, we extract line segments and road center lines on the given remote sensing images. Second, we could obtain many pairs of parallel lines with width information by computing the positional relationship between each other. Then K-means...
Extreme climate events are projected to increase under the context of global warming associated with the increase in greenhouse gas emissions. In particular, coastal regions which are also characterized with significant urbanization will be vulnerable to the extreme events, such as severe typhoon. Timely assessment and accurate information on the extent and severity of the damage caused by extreme...
This paper proposes a novel approach for traffic sign detection and rapid damage inspection in natural scenes based on mobile laser scanning (MLS) data, including images and point clouds. The inspection results assist traffic management departments to take immediate measures to update and maintain traffic signs after natural disasters leading to many damaged traffic signs. Our approach involves four...
This work theoretically studies the period-one (P1) oscillation dynamics of a quantum cascade laser subject to the optical injection. The P1 oscillation frequency increases continuously with the detuning frequency, while the oscillation power is enhanced by increasing the injection ratio. When the optical injection is operated close to the Hopf bifurcation, the frequency and the power variations of...
Unlicensed taxis are widely considered as major obstacles to city traffic regulation and public safety. Thus, many governments have issued restrictions for car-hailing services and alleged that the use of unlicensed vehicles was illegal. However, it is very challenging that traffic administrative enforcements face limited manpower to prohibit unlicensed taxis, due to costly and time-consuming procedure...
In this work, we proposed the architectural memory co-simulation tool to generate the floorplan, power, timing, and thermal Information. A STTRAM prototype is applied as a design example to demonstrate the features of the proposed co-simulation tool.
Designing efficient and fast toll service system of the expressway has an important significance in improving the quality of public travel and facilitating people traveling. In this paper, the construction cost and service efficiency of the toll service system are considered, and a design scheme of toll service system is proposed, which includes the number of toll stations, the ways of charging and...
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