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We seed a unique, broad-gain-bandwidth (60nm at 1550nm) intermodal four-wave mixing process yielding 10kW-peak-power pulses tunable from 786–795nm, resulting in the first power-scalable all-fiber tunable source in the spectral range of the ubiquitous Ti:Sapphire laser.
In this paper, we investigate distributed consensus problems for multiple miniature aerial vehicles (MAVs) with nonlinear dynamics and uncertainty. We develop distributed consensus protocol to solve regulation synchronization problem for leaderless MAVs with directed interaction topology. Adaptive control algorithms are used locally for each vehicle to deal with nonlinear dynamics and uncertainty...
Consensus based distributed robust adaptive finite-time secondary voltage control is designed for inverter-based islanded AC microgrids. The design combines decentralized local states information with the states of the neighboring distributed generators with directed communication topology. Robust control algorithms are used locally for each distributed generator to deal with uncertainty. Lyapunov...
In this paper, we develop haptic based force reflecting interaction interface for bilateral telemanipulation of miniature aerial vehicle. The human-master interface combines shared control term with the reflected force fields mapped by using artificial force field and virtual impedance force field. The shared control for the human-master comprises velocity signals of the with the scaled position of...
We demonstrate that a field effect transistor (FET) operating as THz or far infrared sensor could be used as a sensitive spectrometer when exposed to a strong tunable local oscillator signal with the varying frequency and phase. The FET nonlinearity results in the detected signal being enhanced by the local oscillator power and proportional to the cosine of the phase difference between the local oscillator...
Terahertz (THz) plasmonic field effect transistor sensors have emerged as prime contenders for applications in THz and sub-THz communications, biomedical sensing, and imaging. Noise is one of the most important factors determining their performance. We show that the conventional approach of using thermal noise of the device impedance for predicting the sensor performance is inadequate because it ignores...
To miniature RLG, the path length limit for navigation grade performance is estimated, and dither frequency and amplitude is increased to improve random walk coefficient; dither motor is optimized to obtain minimum size and good vibration performance; a structural, piezoelectric coupled finite element model for path length control (PLC) transducer is established, to increase the compensation ability...
In surgery, tissue and organ bleeding is common and unavoidable. Adding bleeding simulation to virtual surgery can greatly improve the visual realism of the surgical environment, and can also train surgeons' reactions to surgical bleeding. Blood is a kind of viscous and incompressible liquid, and has unique mechanical properties due to the existence of platelets and other cells. The Navier-Stokes...
This paper presents a practical model predictive attitude control method for aerodynamic flight vehicles with wide envelope and independent of angular velocity measurements. At first, the original nonlinear longitudinal dynamics is compensated by an extended state observer, and the compensated system can be approximated by a second-order integrator. Then a modified generalized predictive control algorithm...
A remarkable feature about the temporal optical soliton is that it can be phase-matched to new frequencies, emitting so-called resonant radiation (RR). This constitutes an efficient source of ultrafast pulses in emerging wavelength regimes, and plays a vital role in coherently extending the supercontinuum bandwidth [1]. RR waves are usually invoked by four-wave mixing (4WM) through the self-phase...
RFID systems have been widely deployed for various applications such as supply chain management, indoor localization, inventory control, and access control. This paper deals with the fundamental problem of estimating the number of arriving and departing tags between any two time instants in dynamically changing RFID tag populations, which is needed in many applications such as warehouse monitoring...
This work investigates the mechanism of generation of undesired common-mode (CM) currents in differential-line interconnects with slight non-uniformity owing to imperfect production process. To this end, three different non-ideal configurations are considered, obtained by perturbation of an ideally-uniform differential interconnect composed of two microstrips. By resorting to modal analysis, the governing...
Wireless Power Transfer (WPT) technology has witnessed huge development because of its convenience and reliability. This paper concerns the fundamental issue of wireless charger PLacement with Optimized charging uTility (PLOT), that is, given a fixed number of chargers and a set of points on the plane, determining the positions and orientations of chargers such that the overall expected charging utility...
In datacenter networks, flows can have different performance objectives. We use a tenant-objective division to denote all flows of a tenant that share the same objective. Bandwidth allocation in datacenters should support not only performance isolation among divisions but also objective-oriented scheduling among flows within the same division. This paper studies the Multi-Tenant Multi-Objective (MT-MO)...
It is crucial for cellular data network operators to understand the service quality perceived by its customers. The state-of-art systems deployed in cellular networks mostly report service quality aggregated on cell site level, which is typically an aggregation of tens or hundreds of customers depending on the locations of the cell sites. In this paper, we propose to enhance the measurement of customer-perceived...
For the purpose of utilizing decomposition component analysis (DCA) for fault diagnosis of SF6 gas insulated equipment further, SF6 spark decomposition experiments under different spark energies were carried out on the frequency and energy-controllable SF6 spark decomposition test platform. The amount of gaseous by-products of SF6 sparks were measured by GC-MS. The main gaseous by-products of SF6...
Outdoor localization is of great importance for driving navigation, attracting many research efforts in past decades. Prevailing GPS achieves meter-level localization accuracy under general outdoor conditions. Yet, GPS service performs poorly in urban canyons where skyscrapers blocks GPS signals and drain mobile phone battery quickly within few hours. In this work, we exploit common city facilities,...
A recently discovered topological insulator (TI) is a new type of solid material that behaves as an insulator in its interior and as a conductor on its surface.
This paper mainly focuses on the optimization of rotor structures of permanent magnet (PM) motor. It combines global optimization method with the finite-element computation and the response surface model for solving the single-objective optimization for the motor structure. By varying the design parameters of a general pattern of rotor topologies, it is capable of simulating for different types of...
This paper concerns the fundamental problem of processing conjunctive queries that contain both keyword conditions and range conditions on public clouds in a privacy preserving manner. No prior Searchable Symmetric Encryption (SSE) based privacy-preserving conjunctive query processing scheme satisfies the three requirements of adaptive security, efficient query processing, and scalable index size...
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