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Fault tolerance is one of the major design goals for HPC. The emergence of non-volatile memories (NVM) provides a solution to build fault tolerant HPC. Data in NVM-based main memory are not lost when the system crashes because of the non-volatility nature of NVM. However, because of volatile caches, data must be logged and explicitly flushed from caches into NVM to ensure consistence and correctness...
Preclinical studies have shown that MRI-guided focused ultrasound (MRgFUS) can achieve spatially localized thermal exposures in the range of 41–43°C. This presents an advantageous scenario for a plethora of targeted therapeutics. It has been observed that the administration of contrast agent microbubbles (MB) can facilitate increases in temperature with focused ultrasound (FUS), resulting in accelerated...
Homogeneous discharge is a hot topic with a lot of practical value in the field of plasma. With the change of gas condition (e.g. the gas pressure and composition etc.), a transition from partial discharge mode (or filamentary mode) to homogeneous discharge occurs. In this article, the surface charge behavior of the transition from filamentary mode to homogeneous mode was investigated. The dynamic...
In this paper, based on the PEA equipment in our laboratory, the attenuation and dispersion of charge acoustic signals in the flat XLPE samples with the different thicknesses and under the different nanosecond pulse widths were studied through experiments and simulations. Then, through the extraction and extension of attenuation and dispersion coefficients of acoustic wave under different pulse frequencies,...
According to our previous experiment, oil flow electrification is closely related to the space charge behaviors in oil-paper insulation system under DC voltage. In this paper, we present a new numerical method to estimate the streaming current in a rectangular paper duct under DC voltage. For the simulation model, we consider the case of laminar flow in a sample of two layers of oil-impregnated-paper...
HPC applications pose high demands on I/O performance and storage capability. The emerging non-volatile memory (NVM) techniques offer low- latency, high bandwidth, and persistence for HPC applications. However, the existing I/O stack are designed and optimized based on an assumption of disk-based storage. To effectively use NVM, we must re-examine the existing high performance computing (HPC) I/O...
Statistical analysis using large-scale brain magnetic resonance (MR) image databases has examined that brain tissues have age-related morphological changes. The age of a subject can be estimated from the brain MR image by evaluating morphological changes with healthy aging. This paper proposes an age estimation method using local features of T1-weighted MR images. The brain local features are defined...
This paper describes the design, fabrication and characterization of an in-plane positioning system within a thick (16 micrometers) silicon dioxide photonic-material stack. This is part of a proposed novel photonic alignment scheme, targeting at highly-automated assembly and high-precision alignment of multi-port photonic chips. Creating such functionality in thick silicon dioxide is challenging because...
The mathematical model of the PD process in the lonely inclusion can be described as a series of discharges at the period of the operation voltage. Distribution of the separate discharge times depends on breakdown correlation, extinction and initial condition voltages and the operation voltage. These factors are deterministic as physical phenomena and are stochastic as a result of their influence...
When a power apparatus is put into operation, temperature difference always exists in its insulation. As to HVDC insulation system, this temperature gradient may play an important role on the space charge behavior and field distribution. This report summarized our attempts to understand the effects of temperature gradient on space charge and material lifetime. Modified pulsed electro-acoustic (PEA)...
Estimating human age from brain MR images is useful for early detection of Alzheimer's disease. In this paper we propose a fast and accurate method based on deep learning to predict subject's age. Compared with previous methods, our algorithm achieves comparable accuracy using fewer input images. With our GPU version program, the time needed to make a prediction is 20 ms. We evaluate our methods using...
We describe a novel automatic calibration method using a single camera for a multiple-projector spherical Fish Tank Virtual Reality (FTVR) display. Modeling the projector as an inverse camera, we estimate the intrinsic and extrinsic projector parameters automatically using a set of projected images on the spherical screen. A calibrated camera is placed beneath to observe partially visible projected...
We describe an auto-calibrated 3D perspective-corrected spherical display that uses multiple rear projected pico-projectors. The display system is auto-calibrated via 3D reconstruction of each projected pixel on the display using a single inexpensive camera. With the automatic calibration, the multiple-projector system supports a seamless blended imagery on the spherical screen. Furthermore, we incorporate...
This talk reviews the development of a new pediatric vision screener, which employs polarization-modulated, retinal-birefringence-scanning-based eye alignment detection and bull's eye focus detection with an improved target system.
Channel state information (CSI) is usually necessary for downlink precoding, power allocation, etc. in multiple-input multiple-output (MIMO) systems. When the base stations (BS) are equipped with massive elements, the training overhead required by conventional CSI estimation methods becomes overwhelming, leading to unacceptable loss of spectrum efficiency. In this paper, we investigate pilot design...
In order to study the effect of space charge on oil flow electrification under DC voltage, an experimental model with plane electrode was designed. A closed oil circulating system was built to simulate the oil path between the windings inside a converter transformer. The results reveal that polarity of streaming current depends on the sample configuration. If the high voltage electrode was covered,...
The homogenous discharges under low pressure have been widely used in many fields, but the influence factors that determine the discharge characteristics are still not clear. So, it is necessary to study the formation mechanism of homogenous discharge and transition process from partial discharge to homogeneous filamentary discharge. It was known that residual surface charge on the dielectrics play...
Under high DC voltage, the space charge accumulation can largely alters the local field distribution in epoxy resin. And it has been revealed that nanoparticles have great influences on space charge distribution in epoxy resin. To reveal the mechanism of nanoparticles, the effects of nanoparticles on trap depth are investigated under different temperature. In this work, epoxy resin and its nano composite...
In the traditional range alignment algorithm of inverse synthetic aperture radar (ISAR) imaging, strong data coupling reduces the efficiency of the algorithm extremely. To decouple the data to the largest extent, a fine-grained optimized parallel range alignment algorithm based on logarithmic steps is proposed in this paper, and the parallel implement of ISAR imaging on Graphic Processing Unit (GPU)...
In this paper, a dividing method for the structure of distribution network has been proposed to adapt rapidly to the variation of the topology and the uncertainty of tide direction caused by network reconfiguration. Based on the definition of out-degree in graph theory, the network has been divided into several branch chains, and the branch chain adjacency list has been set up. The initial results...
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