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An integral sliding mode fault-tolerant control scheme is developed to investigate the problem of flexible spacecraft attitude maneuver. The designed approach is robust and insensitive to external perturbations and model uncertainty resulted from measuring error of the inertia matrix and partial loss of actuator effectiveness. The use of proportional-integral controller reduce the chattering phenomena...
An approach based on the formation of insulating CuO /Y2O3 layer for YBa2Cu3O7−δ (YBCO) coated conductor in a multilayer architecture structure is proposed with respect of high current-carrying ability. Double YBCO layers or oxide buffered metal substrate separated by CuO/Y2O3 insulating layer were deposited by so called Super-Low-Fluorine Metal organic Solution Deposition (SLF-MOD). X-ray diffraction...
Processor operating over a wide voltage range achieves better possible energy efficiency while satisfying varying performance demands of the applications. To enable such a processor that can operate correctly and efficiently, a standard cell library specific for wide voltage operation is necessary. This paper describes a 40nm 0.3V-1.1V CMOS standard cell library by using sizing method to optimize...
Aggregate thickness of 800 nm GdBa2Cu3O7−δ/EuBa2Cu3O7−δ multilayers with various layers are obtained by changing each layer thickness. The evolution of surface morphology, epitaxial texture, and residual stress of quasimultilayers GdBa2Cu3O7−δ/EuBa2Cu3O7−δ thin films deposited by pulsed laser deposition on Hastelloy substrates have been systematically investigated with scanning electron microscopy...
A wireless power transfer system can increase its system frequency to several Megahertz for large spatial freedom. A MHz system usually uses the same compensation as those kHz systems. Traditionally, the rectifier is modeled as a pure resistive load for the coupling coils when designing the compensation capacitors. However, the rectifier input reactance cannot be ignored for MHz systems. This reactance...
In the view of the problem of tuning the parameters of the fuzzy logic controller (FLC) for Delta robot trajectory control, a method is put forward to tune the parameters of membership functions and the gains of the controller with particle swarm optimization (PSO). A PSO with dynamic parameters is proposed which makes the PSO has better performance in global search and faster convergence. The fitness...
This paper presents a field programmable lab-on-a-chip (FPLOC) with microfluidics actuation, droplet location/ category readback, built-in-self-test (BIST), and bioassays detection. This FPLOC is composed of 1,800 MEDA microelectrodes and integrates a set of microfluidic operations to perform droplet moving/cutting/mixing. Besides, capacitive sensing circuits are considered for system automation,...
Taken the high voltage SF6 circuit breaker (HV SF6 CB) as the research object, a novel axial vortex chamber structure with an "X-type" guide blade constructed at the nozzle is proposed to exchange the energy of the turbulent gas flow in the radial direction during the interruption and to control the gas flow temperature gradient. The 3D flow field physical and mathematical model of the arc...
With the development of Location Based Services (LBSs), both academic researchers and industries have paid more attention to GPS-less mobile localization on mobile phones. The majority of the existing localization approaches have utilized signal-fingerprint as a metric for location determinations. However, one of the most challenging issues is the problem of uncertain fingerprints for building the...
M2M is one of the sustained hot research area that envisaged to promote the growth of IoTs (Internet of Things) and can provide home-based preventive and auxiliary technology to household. Current researches are more focused on the sheer technological (e.g., protocol design, routing, data fusion, etc), but the defect of the current incomplete information observation and others technical gaps makes...
With the expansion of decentralized multi-robot system's applications, limited communication resources has become a critical factor toward the efficiency of multi-robot coordination when both system sizes scale up and their tasks become more complex. In current researches, it is only possible for every robot in a decentralized setting either to choose a part of communication channels to communicate...
In the speech enhancement algorithm, adding Mel-frequency domain processing will make the processed more in line with the characteristics of human ears. The implementation of this approach is based on the Wiener filter, which will be improved obviously of the sound quality, but will keep too much background noise. For this reason the output SNR(signal-to-noise ratio)reduced. At the same time, we all...
Traditionally, mobility of the bulk organic semiconductor materials was thought to increase with the increase of carriers' concentration. However, the experimental results show that the field effect mobility in OTFTs degenerate with the increasing gate voltage at high gate bias. Recently, even the source/drain current was found to decrease at high gate voltage bias. To interpret this phenomenon, we...
Multi-LRF(Laser Range Finder) systems have been broadly utilized in sensor fusion for automobile. In order to convert multiple LRF data into a unified coordinate system, we have to obtain the rigid transformation among multi-LRF. In this paper, we propose a new algorithm for online extrinsic calibration of multi-LRFs by observing a planar checkerboard pattern and solving for transformation between...
The existing GSM networks are promising candidates to enable the machine-to-machine (M2M) communications due to their global deployment. However, these networks are initially designed for mobile telephony, and need to be renovated to adapt to the new M2M applications. In this paper, we address the perspective of upgrading the channel coding scheme of the GSM networks for the M2M communications. Concretely,...
We present a transport-layer network that aids developers in building safe, high-performance distributed FPGA applications. Two essential features of such a network are virtual channels and end-to-end flow control. Our network implements these features, taking advantage of the low error characteristic of a rack level FPGA network to implement a low overhead credit based end-to-end flow control. Our...
Technology of thin film transistors based on organic semiconductor (OTFTs) materials had gained great progress in recent years. A technology computer aided design (TCAD) model is needed to further investigate the devices physics and shortcut the fabrication process. In this article, based on hopping transport mechanism, we proposed a physical model for charge transport process in OTFTs. By Monte Carlo...
For mobile robots and position-based services, such as healthcare service, precise localization is the most fundamental capability while low-cost localization solutions are with increasing need and potentially have a wide market. A low-cost localization solution based on a novel Visible Light Communication (VLC) system for indoor environments is proposed in this paper. A number of modulated LED lights...
Performance and energy efficiency are major concerns in cloud computing data centers. More often, they carry conflicting requirements making optimization a challenge. Further complications arise when heterogeneous hardware and data center management technologies are combined. For example, heterogeneous hardware such as General Purpose Graphics Processing Units (GPGPUs) improve performance at the cost...
Body bias effects on the laser-induced transient current peak, duration, collected charge and amplification factor are experimentally evaluated. The results are promising for radiation-hardened circuit design.
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