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This paper presents a method that embeds stability-sensitive filter in the temporal matching kernel with explicit feature maps (TE). The added filter improves the robustness of TE to noise for content-based video retrieval. Originally TE embeds temporal information of frame descriptors by using explicit feature mapping in a fixed length video vector by using a temporal invariant match kernel. TE matches...
Given some (but not all) monthly totals of people with measles (or counts of product-units sold, or counts of retweets), how can we recover the weekly counts? Requiring smoothness between successive weeks is reasonable - but can we do better, if we have some domain knowledge? For example, we know that measles (flu, count-of-retweets, etc) follow a specific cascade model, like the so-called 'SIS'....
Dual-comb spectroscopy is demonstrated using microresonator soliton frequency combs by measuring the absorption spectrum of H13CN in the near-infrared. The results show the potential for a chip-based, high-precision spectroscopic system.
Dispersive-wave scattering from dissipative Kerr solitons is induced by spatial-mode interactions within a high-Q micro-resonator. A limiting case, single-mode dispersive waves, are observed and their interaction with the soliton causes hysteretic behavior.
A soliton is reported that regenerates by optimizing its Raman interaction with another soliton within a shared optical potential well. The soliton is observed in a high-Q silica optical microcavity.
As a state-of-the-art ensemble method, random forest which exhibits a good ability to predict and generalize on various dataset is often composed of a large number of trees. Redundancy of ensemble and connotative decision rules result in expensive operational costs as well as difficulties in comprehension. In this paper, novel leaf node-level pruning methods for random forest are proposed. Each leaf...
This paper proposes an enhanced modular multilevel converter based battery energy storage system (EMMC-BESS) for interfacing low voltage batteries to the medium or high voltage grids. Besides the distributed battery integration functionalities and the inherited advantages of traditional MMCs, EMMC-BESS also provides the DC fault handling capability. Based on analysis of operation principles, the control...
In this paper, we study vision-based localization for robots. We anticipate that numerous mobile robots will serve or interact with humans in indoor scenarios such as healthcare, entertainment, and public service. Such scenarios entail accurate and scalable indoor visual robot localization, the subject of this work. Most existing vision-based localization approaches suffer from low localization accuracy...
Deep learning has been proposed for soft sensor modeling in process industries. However, conventional deep neural network (DNN) is a static network and thereby can not embrace evident dynamics in processes. Motivated by nonlinear autoregressive with exogenous input (NARX) model and neural nets based dynamic modeling, a dynamic network called NARX-DNN is put forward by further utilizing historical...
Traditional cloud stacks are designed to tolerate server or rack-level failures, that are unpredictable and uncorrelated. � Such stacks successfully deliver highly-available cloud services at global scale. The increasing criticality of cloud services to the overall world economy is causing concern about the impact of power outages, cyber-attacks, configuration errors, or other causes of datacenter...
Traditional Z-source inverter can boost or buck voltage for its unique impedance network, but also has its own drawbacks, such as input current is not continuous, boost capacity is limited, the capacitor voltage stress is large and etc. In order to overcome the shortcomings of the traditional Z-source inverter, a series of Z-source inverters are proposed. In this paper, the topology of three kinds...
Second-harmonic generation (SHG) has been used for demonstrating nonlinear electromagnetic responses in different materials. In this paper, the SHG in a semiconductor layer is studied under microwave and terahertz frequencies. The hydrodynamic nonlinear Drude model is implemented in the semiconductor layer to model the interactions between the carriers and the electromagnetic fields. A numerical algorithm...
This paper simulates scattering properties of metasurfaces by finite difference time domain(FDTD) method with generalized sheet transition conditions (GSTCs) to alleviate computational burden. It is found that a metasurface can be represented by the electric and magnetic polarization densities, which is related to electromagnetic field by GSTCs. The GSTCs are thereby implemented in 3D FDTD codes and...
Many electromagnetic devices, such as metasurfaces, reflectarray antennas, nano particle arrays, can be modeled as quasi-periodic arrays. Simulation of electromagnetic wave interaction with such arrays are very challenging because they are usually large multi-scale models. In this work, we develop a fast algorithm to model quasi-periodic arrays. In this algorithm, we take advantage of the similarities...
In this paper, a split ring is proposed as a phasing element for wideband reflectarray design. A full 360° phase coverage is obtained through changing gap size of the split ring element. The phase curve is a straight line at central frequency and parallels to each other when the working frequency deviates from the central frequency. Then a reflectarray with a circular aperture of 300 mm in diameter...
Planar quasi-periodic arrays are widely used in many electromagnetic devices such as metasurfaces, reflectarray antennas, nano particle arrays, etc. They comprise similar elements located on periodic grids. In this work, we compare the reflection phase of elements in the array between the designed value and the practical one. This difference is mainly because real quasi-periodic arrays break the periodicity...
In conventional reflectarray design, the elements are designed to provide the required reflective phase but don't have the ability of controlling reflective amplitude. In this paper, a novel reflectarray element with both amplitude and phase control is presented. An element with full 360° phase coverage and from 0 to 1 amplitude modulation has been realized. The reflective amplitude is controlled...
In-wheel motor system is recognized as the ideal drive system for electric vehicles. To reduce mechanical shock and electromagnetic impulsion brought by rigid connection between hubs and motor, our group proposed a novel permanent bistable electromagnetic clutch which flexibly connecting the motor and hubs. In this paper, several power supply schemes for the clutch are proposed and compared, then,...
3D gated clock tree synthesis (CTS) mainly consists of three steps: 1) abstract clock topology generation; 2) layer embedding for minimal TSV allocation and 3) clock tree routing with gate and buffer insertion. In this paper, a self-tuning spectral clustering based nearest-neighbor selection (SSC-NNS) algorithm with parallel structure is proposed to achieve high time efficiency in clock tree topology...
Ag NPs paste is becoming a promising material for interconnections due to its particular size effect. The joints can be formed from Ag NPs paste through a sintering process which evaporates and burns organics and then fuses silver particles. However, it is less preferable in industry because of its time-consuming sintering process and large heat-affected zone. In this paper, to narrow the time parameters,...
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