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In this digest, we report significant improvements over the method developed by Shen et al. [1] to extract bearing coefficients of a fluid-dynamic bearing (FDB) spindle motor in hard disk drives (HDD). An exact formulation is developed to extract bearing coefficients. Angular and radial displacements are measured to improve accuracy. Bearing coefficients are extracted successfully via three rounds...
Statistical inference of a three-parameter distribution with closed-form mean residual life function is studied for complete and Type-II censored data. Because the log-likelihood function for this new distribution is not convex, the sequential quadratic programming method used for the maximum likelihood estimation easily diverges. Therefore, a modified Monte Carlo EM algorithm is proposed for parameter...
A highly manufacturable embedded DRAM technology at 40 nm node is presented. This report provides the characterization data of 128 Mbit embedded DRAM test vehicle fabricated by 40 nm eDRAM 200 MHz low power process. The test vehicle is composed of 32 macros and each macro unit is 4 Mb with configuration 32 k × 128 bits. The process is cost effective and compatible to our low power Logic core process...
The project addresses a solution to assisting people confined to wheelchairs, who may be physically, perceptively, or cognitively challenged, in restoring or augmenting their ability to steer a wheelchair by integrating brainwave decoding, onboard sensing, artificial neural networking, and machine learning in an intelligent wheelchair system.
The majority of the existing supplier selection (VS) approaches obtained their optimal solutions based on the operational metrics. This study considers the supplier integration spectrum (SIS) to secure the efficacy of VS. This work adopts supplier's process capability indices and process yields as operational (hygiene) criteria to estimate their quality capabilities. The business process-oriented...
Repetitive practices can facilitate the rehabilitation of the motor functions of the upper extremity for stroke survivors whose motor functions have been impaired. An affordable rehabilitation system for hand motion would be useful to provide intensive training to the patients. Augmented Reality (AR) can provide an intuitive interface to the users with programmable environment and realism feelings...
DESDynI is a mission being developed by NASA with radar and lidar instruments for Earth-orbit remote sensing. This paper focuses on the design of a large-aperture antenna for the radar instrument. The antenna comprises a deployable reflector antenna and an active switched array of patch elements fed by transmit / receive modules. The antenna and radar architecture facilitates a new mode of synthetic...
We present an analysis of terahertz pulsed imaging (TPI) measurements made on pharmaceutical tablets compacted at a range of compression forces. In particular, we investigate the uniformity and local variations in the refractive index on the surface of tablets of different shapes. Through terahertz imaging it has been possible to observe small-scale deviations on tablet surfaces that may have relevance...
Terahertz pulsed imaging (TPI) is a powerful tool for non-destructive quantification of pharmaceutical tablet coatings. In this paper, we present a Neural Network (NN) based method for extracting the coating thickness from the FFT-amplitude of the measured terahertz waveform. We demonstrate that the NN-based frequency domain method outperforms the standard “peak-finding” time-domain method, in terms...
The present study investigated the spatial-temporal characteristics of chlorophyll a (chl-a) concentration in Sanya Bay by shipboard survey data at 12 stations from 2006 to 2008, and discussed the relationship between chl-a distribution and influential factors using MODIS sea surface temperature (SST), sea surface wind (SSW) and rainwater runoff data. Results showed that the chl-a concentration in...
Tandem-L is a proposal for an innovative interferometric and polarimetric radar mission that enables the systematic monitoring of dynamic processes on the Earth surface. Important mission objectives are global forest height and biomass inventories, large scale measurements of millimetric displacements due to tectonic shifts, and systematic observations of glacier movements. The innovative mission...
Toward the development of optical data storage system, higher resolution and broader operating bandwidth optical pickup is necessary for high data-density optical discs such as Blu-ray disc (BD). This paper is aim at developing a piezo-based actuator to replace existing voice coil motor (VCM) actuator for providing precise tracking and focusing positioning in optical disk devices. Double lead compensator...
Regarding the single screw compressor, a kind of good performance screw meshing pairs is very important. This article mainly carries on the designing of the new screw meshing pairs profile generation, and also discusses the manufacturing method of this kind of meshing pairs, providing important reference value for further enhancing the meshing pairs design, processing level.
In this digest, we present a simple method to extract bearing coefficients of a fluid-dynamic bearing (FDB) spindle motor. The spindle motor is first loaded with a known proof mass. An impact hammer and a laser Doppler vibrometer are used to measured frequency response functions (FRF) of the spindle motor. Since the proof mass is very rigid, the FRF below the first resonance frequency reflects the...
As the most popular device for terahertz (THz) generation and detection, photoconductive antenna has attracted a lot of attention in recent years. The conventional photoconductive antenna has a relatively omni-directional radiation pattern and not all the radiated power can be used in a typical THz system. This paper is aimed at developing a photoconductive horn antenna with a uni-directional radiation...
We introduce BERS*, an enhanced blocking expanding ring search (BERS) protocol for route discovery in mobile ad hoc networks (MANETs). BERS is an energy efficient alternative that was developed recently based on the expanding ring search (ERS). ERS is widely applied in reactive routing protocols such as DSR and AODV. BERS* is a faster and more energy-time efficient version of BERS. It reduces the...
Due to the limitations of traditional high speed video camera, ultra-wideband (UWB) technology is proposed to track debris of concrete in explosion. The UWB enabled debris tracking system is composed of active integrated tag embedded in concrete with size of only 25 ?? 25 ?? 25 mm, four sensors and one locator. The successful 2D position tracking test in real time in an indoor open area of 10 meters...
In this paper, we present a framework for Bayesian inference in continuous-time diffusion processes. The new method is directly related to the recently proposed variational Gaussian Process approximation (VGPA) approach to Bayesian smoothing of partially observed diffusions. By adopting a basis function expansion (BF-VGPA), both the time-dependent control parameters of the approximate GP process and...
A radon gas monitor with wireless readout has been designed, built and successfully tested. The monitor is based on a custom silicon chip that detects the alpha particles produced in the decay of radon and its progeny. The chip is combined with an electrostatic concentrator that collects progeny from the ambient air, giving good sensitivity. A wireless interface allows the monitor to be placed in...
We report a high power, widely-tuneable Tm-doped fiber master-oscillator power-amplifier system generating over 100W of linearly-polarized output with a ≫190nm tuning range. The output power is limited only by the available pump power.
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