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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 consider a visible light communication (VLC) system with light emitting diodes (LEDs), wherein LEDs are used for information transmission as well as reception while providing illumination. At the transmitter, a combination of a pulse width modulation (PWM) signal and a redundant run-length limited encoded on-off keying (OOK) signal is used for data transmission. The LED receiver uses OOK and the...
A novel non-volatile 1-bit binary comparator based on pure memristors and an 8-bit comparator based on 1T1M (1 transistor per memristor) crossbar array are proposed in this paper. The proposed comparator is sneak-path free and has short delays. It can be extended to an arbitrary N-bit comparator with 7N memristors and 7N transistors. The worst case input-to-output delay is 4.8ns. A 64-bit comparator...
Hybrid excited flux-switching machine (HEFS) is a novel brushless synchronous motor. Compared to conventional permanent magnet synchronous machine (PMSM) and permanent magnet flux switching (PMFS) machine, it has additional excitation winding in its stator to modulate the air-gap magnet field. In this paper, the topology and operating principle of HEFS is analyzed. Its dynamic mathematical models...
Probabilistic tracking algorithms typically using linear structure to update the learning model. Such linear structure is not appropriate for long-term robust tracking as the occlusion and other challenging factors may interfere the processing of incoming frames. Recently a spatio-temporal context (STC) algorithm based on Bayesian framework has using the context information between the target and...
In many THz Time Domain Spectroscopy configurations, the separate acquisition of background and sample measurements have significant impact on data quality due to the need to perform subsequent measurements as well as the change in beam coupling geometry due to the removal of the sample in the reference measurement. In this short paper, we report on the design and build of a dual-polarization TDS...
Surgical robot research is driven by the desire of improving surgical outcomes. This paper proposed a Recurrent Neural Network based controller to address two problems: 1) improving control precision, 2) increasing adaptiveness for robot motion (explained in Section I). RNN was adopted in this work mainly because 1) the problem formulation naturally matches RNN structure, 2) RNN has advantages as...
Safety is essential for physical Human-Robot Interaction (pHRI). Nowadays, most safety studies have focused on collision analysis and safety evaluation instead of the consideration of inherent safety. In this paper, a dual-arm robot easily manufactured in batch is developed with homogeneous compliant joint. In order to compromise performance and safety, a nonlinear model of human-robot collision with...
The charging power supply for batteries may be variable under many circumstances, e.g., when using solar panels or air-driven generators as the energy source. The mismatch between the voltages of the power supply and the battery may cause significant charging inefficiency. In this paper, we use reconfigurable batteries to solve this voltage mismatch problem. We develop algorithms to dynamically decide...
With the application of the robots more extensive, human-robot coexistence in the shared workspace is required on many occasions (e.g. home service, nursing care, industry, etc.). Therefore, human safety within human-robot coexistence represents the key requirement. Most safety studies have focused on collision analysis and safety evaluation, but not on the consideration of inherent safety and design...
The control of robotic manipulators has received significant amount of attention in the control and robotics communities. In this paper, we investigate the kinematic control of a manipulator with an eye-in-hand camera, which is referred to as visual servoing. The visual servoing problem is formulated as a constrained optimization problem, which is then solved via a recurrent neural network. By this...
For the purpose of enhancing compliance of robot joint, an impedance control strategy with new inner torque controller is proposed. Apparent inertia of the motor can be scaled down thanks to this new type of torque controller. Effects of different position (motor-side position θ and link-side position q) feedback strategies are explored through theoretical deviation, simulation and static stiffness...
This paper considers the detection problem and its realistic implementation for multiple-input multiple-output (MIMO) radar with widely separated antennas. In particular, since the range cells of different transmit-receive channels are not in superposition, but intersecting with each other, it is difficult to determine, by gathering measurements from all transmit-receive channels, whether a target...
In this paper, we optimize the the symbol error rate (SER) performance of full-duplex (FD) amplify-and-forward (AF) relay system by adopting the joint power allocation and relay location optimization. We first derive the asymptotic expressions of the outage probability and SER performance under the consideration of the loop interference. We then formulate the optimization problem based on the minimal...
Hadoop is now the de facto standard for storing and processing big data, not only for unstructured data but also for some structured data. As a result, providing SQL analysis functionality to the big data resided in HDFS becomes more and more important. Hive is a pioneer system that supports SQL-like analysis to the data in HDFS. However, the performance of the early-version of Hive is not satisfactory...
Stroke is mainly caused by the brain damage due to the acute cerebral vascular disease and its primary disease, which can make upper limb or lower limb on one side of the body movement-disorder. Early rehabilitation training is the most effective way to regain the Activities of Daily Living (ADL). Based on the concept of humanoid and modular design, this paper outlines the design process of humanoid...
Taking into account the advantageous or un-advantageous properties of mineral oil and natural ester, our team developed a new type of mixed insulating oil with good physical and electrical performances which were derived from mineral oil and natural ester. The moisture effect on the AC breakdown and frequency dielectric response characteristics of mineral oil/paper insulation and mixed insulating...
This paper investigates the distributed motion planning of multiple robot arms with limited communications in the presence of noises. To do this, a nonlinearly-activated noise-tolerant zeroing neural network (NANTZNN) is designed and presented for the first time for solving the presented distributed scheme online. Theoretical analyses and simulation results show the effectiveness and accuracy of the...
The speed control of permanent magnet brushed (PMB) DC motors at low speeds is difficult due to the nonlinearity caused by various types of frictions. Under parameter uncertainty, the speed control becomes more difficult. In this paper, to handle the parameter uncertainty, we propose a dynamic neural network to adaptively reconstruct or learn the dynamics of PMB DC motors. Then, based on the parameters...
The constant beamwidth beamforming is a key technique and research focus in the broadband array signal processing. However, most conventional methods can only satisfy constant mainlobe width and the performance will degrade severely when mainlobe and sidelobe interferences exist. To overcome this problem, a broadband constant beamwidth beamforming for suppressing mainlobe and sidelobe interferences...
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