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Targeting the development of a silicon carbide (SiC) inverter for electric vehicle/hybrid electric vehicle (EV/HEV) applications, the design considerations of the gate driver for the adopted SiC metal-oxide-semiconductor field-transistor (MOSFET) power modules are presented. Given the system power density requirement, the gate driver design challenges for the commercial off-the-shelf (COTS) SiC modules...
We consider the fundamental derandomization problem of deterministically finding a satisfying assignment to a CNF formula that has many satisfying assignments. We give a deterministic algorithm which, given an n-variable \poly(n)-clause CNF formula F that has at least ≥ 2^n satisfying assignments, runs in time \[ n^{\tilde{O}(\log\log n)^2} \] for ≥ \ge 1/\polylog(n) and outputs...
Permanent Magnet Synchronous Machine (PMSM) torque control over a wide speed range is essentially an optimization problem that treats torque error minimization as the objective function with inverter voltage and current as constraints. It is usually time consuming and difficult to solve such optimization problem for closed-form solutions since torque, voltage and current equations are all non-linear...
Berthing support system is widely used in ship berthing to ensure the safety. In this paper, we focus on ship berthing support using laser sensor for distance measurement and marine hydro meteorological sensors for wind, wave and current measurement. A laser berthing model is proposed. Leveraging on the model, stern and bow distance, speed, stern and bow direction and ship steering angle can be calculated...
A weight-t halfspace} is a Boolean function f(x)=\sign(w_1 x_1 + … + w_n x_n - θ) where each w_i is an integer in \{-t,\dots,t\}. We give an explicit pseudorandom generator that δ-fools any intersection of k weight-t halfspaces with seed length \poly(\log n, \log k,t,1/δ). In particular, our result gives an explicit PRG that fools any intersection of any...
Because of the wind power generation has good economic and social benefits, which has been aroused more and more people's attention. The variable pitch control has an important part in the wind turbine. The indexes of the variable pitch has great influence on the dynamic performance with the unit, which can become an important index to measure the performance of the wind turbine. Due to the non-linearity...
Modal birefringence of the high-order modes in geometry-perturbed fibers with a multiple rotational symmetry core is analyzed by coupled-mode theory. The criterion of modal birefringence is thus identified by the angular-matching condition in mode couplings, which can be verified by waveguide modal analysis. It will benefit for the applications of the kind of fibers.
In this work, we provide a solution for posturing the anthropomorphic Robonaut-2 hand and arm for grasping based on visual information. A mapping from visual features extracted from a convolutional neural network (CNN) to grasp points is learned. We demonstrate that a CNN pre-trained for image classification can be applied to a grasping task based on a small set of grasping examples. Our approach...
This paper presents a comparison of two structural coils (solenoid and planar spiral coil) for wireless power transfer (WPT) system in many ways. The impedance properties of two structural magnetic coils are discussed. And the influences of structural parameters (such as diameter, number of turns and layers) on the transfer performance are also analyzed. Furthermore, the magnetic resonance coupling...
We have investigated different factors which affect the capillary flow behavior of epoxy mixtures to cause failure modes such as overflow/incomplete flow issues during a chip package process. Stability of epoxy mixture fluidness and substrate surface roughness have been revealed to significantly affect the flow behavior when compared with other factors. Based on the investigation results, we rank...
Flexible high voltage direct current transmission system based on modular multilevel converter (MMC-HVDC) have great potential for long-distance power transmission in wind farms. Modular multilevel converter (MMC) start-up is the key to solve the problem for MMC-HVDC. This paper designs a new topology based on VSC-MMC and a step-by-step method is proposed to suppress the DC voltage drop of the momentary...
In this study, we compared the basic switching behaviors of HfO2, Al2O3 and HfAlOx (Hf:Al=9:1) based RRAM with Ti top electrode by setting various compliance currents (1mA, 5mA, 10mA, 15mA). The resistance ratio of HfO2 based RRAM (20 → 320) increases with compliance current whereas it drops not obviously for Al2O3 based RRAM (85→54). HfAlOx (Hf:Al=9:1)) based one has the best resistance ratio (300–440)...
In today's digital environment security and privacy of personal information becomes important as an increasing percentage of the population makes daily usage of both mobile devices and cloud storage. Security and assurance of mobile computing is vital to both the normal functioning in people's lives as well as our social, economic and political systems. In this paper we propose and implement a mobile...
Four HfAlO based resistive random access memory (RRAM) devices with different HfO2 percentage (0%, 10%, 90% and 100%) were fabricated using atomic layer deposition (ALD). Three types of electroforming processes were observed with 1mA current compliance (CC), including initial high resistance state (HRS), initial medium resistance state (MRS) and initial low resistance state (LRS). The modulation of...
HfO2 gate dielectric is fabricated by atomic layer deposition on an n-type germanium (Ge) substrate to form p-type Ge MOS capacitors. Three solution-based chemical treatments of the Ge surface using propanethiol, octanethiol and (NH4)2S solutions respectively as well as post-metallization annealing are investigated to improve the interface quality of HfO2 gate dielectric on the Ge substrate. Experimental...
The massive data and complex reservoir environment make the process of well-pattern evaluation inefficient, however, the thought of computing with words provides new idea for intelligent evaluation of injection-production well pattern. Perceptual reasoning method based on firing intervals and one based on similarity are discussed to obtain the output of the engine of computing with words. Firing interval...
Recommender systems have proved to be an important response to the information overload problem, by providing users with more proactive and personalized information services. Collaborative filtering is the most popular method in implementing a recommender system. The Slope One algorithm, which is one of collaborative filtering algorithms, is not only easy to implement, but also efficient and effective...
The Android application is part of people's lives, however the functionality required by various user has greatly exceeded its original design. As a result, one must seek other ways to gain permission that is not directly available to the user. A typical approach is using the Android Debug Bridge (ADB), a developer tool that is used to grant permission to critical system resources. There are millions...
Massive number of devices must operate for a long time with very limited chance to contact energy sources in current Machine-to-Machine (M2M) network, so power saving mechanism is very essential. In this paper, we analyze energy efficiency of Contention Tree Algorithm(CTA), which is one popular contention based data transmission method currently, and propose one enhanced CTA: Power Saving CTA(PS_CTA)...
Underwater navigation that relies solely on dead reckoning suffers from unbounded position error growth. In traditional positioning method, the cost and trouble of deploying, recovering, and assembly have become insuperable obstacle. Based on combination SLBL with an Argo float, a new positioning method of autonomous navigation is proposed in the paper. In order to improve the ranging accuracy, with...
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