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By adjusting the ellipticity of counter-rotating polarized few-cycle pulses for non-collinear high order harmonic generation, we obtain full control of polarization states of isolated attosecond pulses for the first time.
The Particle Swarm Optimization (PSO) has been widely used to solve the selective harmonic elimination (SHE) problem, however, the executing efficiency is not very good if it is implement on the traditional Central Processing Units (CPUs). In this paper, the PSO is parallel implemented on the Graphical Processing Unit (GPU) under the Compute Unified Device Architecture (CUDA). Then, the GPU-accelerated...
As more and more Internet of Things (IoT) devices are connected to the cloud services, fog computing has emerged as a new computing model to provide analytic and intelligent services to the end users for fast response time. Among the application layer protocols used for IoT, MQTT and CoAP are two well-known lightweight protocols that run on top of TCP and UDP, respectively. MQTT supports publish/subscribe...
As more and more Internet of Things (IoT) devices are connected to the cloud services, fog computing has emerged as a new computing model to provide analytic and intelligent services to the end users for fast response time. Among the application layer protocols used for IoT, MQTT and CoAP are two well-known lightweight protocols that run on top of TCP and UDP, respectively. MQTT supports publish/subscribe...
DNW-induced latch-up characteristics and their temperature-dependence are investigated in bulk FinFET technology. DNW-enclosed NMOS in PNPN and PNPNPN structures causes low latch-up immunity with detrimental high-temperature degradation. Varied methods are explored for holding voltage improvement. In summary, the shunting-resistance reduction through process-design co-optimization plays a critical...
This paper proposes evaluation and implementation for media player system by hand gestures using Kinect sensor. The hardware consists of the Kinect for Windows with infra and color camera sensors to capture the depth and plane images, respectively, while the control program is written by VC#. When users execute the control program, the functions of the Media player system can be easily controlled...
Butting and inserted pickup layout in MOSFETs leads to substrate resistance shunting effect and serious ESD robustness degradation. This work develops novel layout with external well/ diffusion resistance embedding between the substrate and the grounding terminal in the NMOS transistors. This layout method can greatly enhance ESD performance of the inserted pickup devices. The second breakdown current...
We recently reported a 5×10−17 level frequency comparison of two 40Ca+ optical clocks, one of which has fractional frequency uncertainty of 3.4×10−17, limited by the BBR effect. Here we present progress towards a 40Ca+ optical clock with uncertainty at the 10−18 level. The differential static scalar polarizability Δα0 of the 40Ca+ ion clock transition is obtained by precisely measuring the “magic”...
We experimentally demonstrate angularly and temporally isolated counter-rotating circularly polarized attosecond pulses at 33 eV. The pulse contrast and circular polarization of the beams are fully characterized by a field autocorrelator and an EUV polarimeter.
A switch size control circuit for voltage-mode DC-DC buck converter is presented. By detecting the average load current, the circuit not only achieves hybrid mode of PWM and PFM operation, but also changes the power switch size according to the load conditions. Both the high-side and low-side switch currents are fully sensed by detecting the filtered smooth voltage of the switch node. The generated...
Many reports show that lung adenocarcinoma (LA) is currently diagnosed at the advanced stages with a lower survival rate, and highly sensitive to the epidermal growth factor receptor (EGFR) gene mutation status. Therefore, great research has been made to implement lung cancer screening programs using computed tomography (CT) imaging modality for early detection of disease. This study aims to distinguish...
This paper deals with the driver design for Brushless DC Motor (BLDCM) by quasi-sinusoidal voltage source inverter with voltage space vector pulse width modulation (VSVPWM) technology. Traditionally, BLDCM is driven by six-step inverter with digital Hall sensor feedback, and has the property of trapezoidal back EMF. However, this paper presents an approach to generate a quasi-sinusoidal voltage source...
Impedance control plays an important role in the control of human-machine control system, especially in rehabilitation devices. It is essential to estimate patient's limb stiffness to adjust the impedance parameters of controller. A large number of studies showed that muscle co-contraction would influence the limb stiffness. This study aimed to investigate the change of ankle joint stiffness using...
Based on a waveguide made of a subwavelength metal-block array with open slots, a kind of scanning antenna is proposed in this work. Low-frequency spoof surface plasmon polaritons (spoof SPPs) exist in this waveguide and under certain conditions, a leaky mode can be produced. The leaky mode could scan the radiation pencil-beam by angles of 53° when the input frequency changes. The leaky mode is derived...
Loop closure detection is very important in visual simultaneous and localization and mapping system (SLAM), which can reduce the accumulated drift. The most successful methods are based on Bag-of-Words model and need a large visual word dictionary. Recently, the VLAD, the state-of-the art compact descriptor, has achieved a great success in large scale image retrieval. In this paper, a novel vlad-based...
Method of balanced scorecard (BSC) may well be one of the most popular strategy management and performance management systems, but BSC can only really success if it is appropriately linked to the employees' intrinsic and extrinsic incentives. In this research, two central issues include motivation and effect on long-term firm value comes into focus in the context of performance evaluation and compensation...
An image-based visual servoing control scheme is proposed for regulating the position and orientation of the nonholonomic mobile robot simultaneously based on an imprecisely calibrated camera. The proposed method only requires measurement information from image and utilizes the elements of the homography matrix between current and goal images to establish an error model, which is then used to develop...
External light trapping has been proposed as an alternative to internal light trapping. The advantage is that the electrical and optical characteristics can be designed separately. This enhances the degree of improvement that nano-photonics can contribute to the solar cell efficiency and JSC. In this work, we use diffuse trench reflectors with down-conversion polymer to demonstrate the concepts of...
Most visual applications rely on matching keypoints between two images. Due to the physical constraints of embedded devices, a descriptor with high accuracy and low memory is preferred for visual applications on mobile devices. Fast Retina Keypoint (FREAK) are known as the fastest descriptor nowadays with robustness on scale, rotation and noise. Based on the sampling points of FREAK, this paper proposes...
This paper proposes a novel image tracking technique for the image-based positioning study on the mobile device. The study uses the panorama as the indoor map to localize the user. Since the number of feature points of the panorama is much larger than feature points from the image of the mobile device, the performance of matching mobile device image with the panorama will significantly affect the...
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