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The rapidly increasing availability of healthcare data from multiple heterogeneous sources has spearheaded the adoption of data-driven approaches for improved clinical research, decision making, and patient management. The patient healthcare data are usually longitudinal and can be expressed as medical event sequences, where the events include clinical diagnosis, medications, laboratory reports, etc...
A field-portable double-pulse laser system was developed to study early-stage plasma in laser-induced breakdown spectroscopy. Emission spectral quality was significantly improved in terms of enhanced peak emission and reduced background emission.
In cellular mobile wireless networks, nonlinear channel fading is always a critical factor which will scientifically deteriorate the Quality of Service (QoS) for the users. However, it is difficult to describe the nonlinear channel fading by precise mathematical model because of its complexity. So, the control of wireless networks becomes an especial tough work. In this paper, a power and rate control...
AIS data are of great significance to ensure the safety of ship navigation and strengthen maritime management. The present study focuses on the situations of AIS data loss in practical applications to research coverage of AIS base station. The original AIS data is pre-processed in accordance with structure characteristics, including data packet, data filtering and so on. Data reconstruction has been...
We presented a 32-channel silicon hybrid demultiplexer fabricated with CMOS technology. Double-etched mode converter and wide arrayed waveguide are used to improve AWG performances while the counter-tapered coupler is optimized for broadband mode multiplexing.
This paper presents a cryogenically cooled, dual polarization, low noise Phased Array Feeds receiver for radio astronomy application, which operated at 4–8 GHz. It is designed to be mounted at the focal plane of a dish antenna by producing 4 dense covered, simultaneously operated beams with benefits of increasing Field of View, survey speed, and improving the aperture efficiency of the dish. Development...
We propose and numerically simulate a 2×2 Digital Optical Switch (DOS) based on silicon-on-insulator (SOI) adiabatic coupler for TE polarizations at 1550nm. The simulation results acquired by Beam-Propagation-Method (BPM) reveal that the cross-talk (CT) levels are below −27dB over a broadband of 60nm. Small simulated insertion-losses (ILs) below 0.1dB are obtained between the wavelengths 1520nm to...
Volume reconstruction plays an important role in improving image quality for freehand three-dimensional (3D) ultrasound imaging. The kernel regression provides an effective method for volume reconstruction in 3D ultrasound imaging, but it requires heavily computational time-cost. In this paper, a programmable graphic-processor-unit-(GPU) based fast kernel regression method is proposed for freehand...
Due to the increasing complexity of web and client application's structure, security problem has become more and more critical. Among all the threats reported, SQL Injection Attacks (SQLIAs) have always been top-ranked in recent years, and network logs, which are very important for the detection of SQLIA, are often utilized to analyze the user's attacking behaviors. However, the collection of network...
In this paper, the optimal fault tolerant control (OFTC) problem is solved for a class of uncertain nonlinear strict feedback discrete-time systems based on the adaptive critic design (ACD). By introducing an auxiliary signal, the influence of the actuator fault on the control performance can be compensated. According to the gradient descent scheme, the updating law for the auxiliary signal is developed...
In this paper, the problem of joint transmit waveform and receive filter design for cognitive radar (CR) is investigated. The problem is analyzed in signal-dependent interference, as well as additive channel noise for extended target with unknown target impulse response (TIR). An improved online waveform optimization design method is employed for target detection by maximizing the average signal to...
The edges of shadows are blurred in Synthetic Aperture Radar (SAR) images due to the moving of the radar when data are collected. This phenomenon becomes obvious in High Resolution (HR) SAR images. In this work, an adaptive approach for shadow enhancements is proposed. The performance of the shadow enhancement has some relationship with the precision of the estimation of the height and this rule is...
In this paper, the problem of adaptive waveform design for cognitive radar (CR) in signal-dependent interference, as well as additive channel noise is investigated. With constraints on waveform energy and bandwidth, a flexible waveform optimization method taking both detection and range resolution into account is proposed. Unlike existing optimal waveforms designed by a single design criterion, waveform...
Digital beamforming (DBF) is wildly used in phased array radars, there are many algorithms and technologies to realize it. The traditional DBF architecture is based on digital signal processor. However, with the increasing requirements on target detection and resolution, the number of channel is getting more, the volumne of processing data is becoming larger, the capability of the digital signal processor...
The Doppler centroid is a crucial parameter for the purpose of implementing azimuth processing for synthetic aperture radar (SAR) data. In this paper, we propose a scheme for estimating the Doppler centroid of conventional SAR. Virtual multi-channel SAR data can be generated by sub-sampling the original SAR data in azimuth. Consequently, each channel data is aliased and the spectrum components within...
This paper proposes an artifact-suppressed stimulator with a referenced and tuned push-pull stimulation (RTPPS) scheme where a tri-polar electrode is employed. The stimulation pulses delivered to two working electrodes are complementary and thus one counteracts with the other to suppress the artifact at the recording site. The prototype stimulator chip is implemented in 0.18-µm CMOS process technology...
SQL Injection Vulnerability (SQLIV) has been the top-ranked threat to the Web security consistently for many years. Penetration tests, which are a most widely adopted technique to detect SQLIV, are usually affected by testing inaccuracy. This problem is even worse in inferencebased, blind penetration tests for online Web sites, where Web page variations (such as those caused by inbuilt dynamic modules...
Model quality is one of the decisive factors that affect the performance of model-based controllers. However, the existing methods were devoted to the monitoring of the overall model quality, and didn't distinguish mismatch of the process model and the disturbance model. Aiming at this problem, this paper presents a new method for monitoring the quality of process model based on input and output data...
Existing power and rate control methods for wireless communication networks aim to maximize the system capacity and the network throughput, and attempt to increase the quality-of-service (QoS), but cannot guarantee the QoS. This paper presents a new power and rate control method for wireless communication networks, which is based on the priority of QoS, so the QoS can be guaranteed. A dual closed-loop...
This paper is concerned with power and rate control for wireless communication networks with nonlinear channel fading. A new mathematical model of power and rate control system is derived, and a robust power and rate controller is designed based on sliding mode control. A sufficient condition for the existence of stable sliding surfaces is established via linear matrix inequality, and the controller...
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