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Projections and measurements of error rates in near-exascale and exascale systems suggest a dramatic growth, due to extreme scale (10^9 cores), concurrency, software complexity, and deep submicron transistor scaling. Such a growth makes resilience a critical concern, and may increase the incidence of errors that "escape", silently corrupting application state. Such errors can often be revealed...
We present two scalable algorithms for identifying program locations that access thread-shared data in concurrent programs. The static algorithm, though simple, and without performing the expensive whole program information flow analysis, is much more efficient, less memory-demanding, and even more precise than the classical escape analysis algorithm. The dynamic algorithm, powered by a location-...
Experiment· were conducted to measure the response characteristic· of a detector system consisting of an array of two electromagnetic pulse induction tensor·. Laboratory data for three object : (1)a ıteel sphere (2) a steel prolate spheroid and (3) an 81 mm mortar casing are presented in order to discuss how the response of an object varies with its depth, orientation and lateral offset from coil...
We demonstrate a 60-GHz CMOS eight-element TX phased array chip for hybrid beamforming with interleaved subarrays to realize spatial division multiple access. The phased array chip has a function to accurately adjust output phases and amplitudes at each antenna element. Its function has been achieved by finely setting the gate bias voltage of all millimeter-wave circuits using a 64-channel 10-bit...
Detection of particles from a far-field source is important in many applications, including optical communications, nuclear hazard detection, radioactivity and detection of cosmic particles. In this paper, we revisit the problem of detection of far-field particle sources using a cubical array. For the case when the source location is deterministic, assuming Poisson arrival of particles, we propose...
In PET systems with a geometry different from a closed ring, the Time of Flight (TOF) of the annihilation photons appears to be relevant. Such a system capability helps to compensate the missing angular information that generates artifacts on the reconstructed images. In this work, two ASIC designs are evaluated for their use in PET systems having accurate coincidence resolving times (CRT) while preserving...
A readout chip, consisting of 32×32 square cells, has been designed in a 65 nm CMOS technology. The circuit will be bump bonded to a slim/active edge pixel sensor to form the first demonstrator for the PixFEL X-ray imager, envisaged for applications to experiments at the next generation X-ray FELs. The pixel pitch is 110 μm, for a total area of about 16 mm2. Different solutions for the readout channel,...
This paper introduces a method to guide the visual search towards a searched object, analogously to what is performed by the top-down visual attention mechanism. This is done by prioritizing scene descriptors based on their Hamming distance to the descriptors of the target. The proposal has constant space and time complexity in relation to the number of descriptors of the searched object. Moreover,...
The article presents custom digital processing system design with use of state-of-the-art SoC-FPGA technology using ARM Coretex-A9 dual core processor embedded in Altera Programmable Logic Array. In article a discussion is conducted about possibilities of using custom programmable logic architecture alongside with hard-core processor system for real-time image processing adopted to dual-channel radiometric...
Cosmic rays interact with the Earth's atmosphere developing extensive air showers (EAS). The EAS can be measured not only using particle detectors on the ground, but also using radio antennas. The radio emission of EAS covers a wide frequency range from the MHz up to the GHz range. Recently, several experimental activities at the Pierre Auger Observatory have measured the radio emission of EAS in...
The importance of pre-clinical research of single photon emission computed tomography(SPECT) imaging is now widely recognized. For the demand of high resolution and high detection efficiency, SPECT has been developed in several ways and it is simultaneously making demand for high quality imaging. This paper introduces the newly proposed dual-head L-SPECT system and investigates the initial performance...
Precise dynamic race detectors incur significant time and space overheads, particularly for array-intensive programs, due to the need to store and manipulate analysis (or shadow) state for every element of every array. This paper presents SlimState, a precise dynamic race detector that uses an adaptive, online algorithm to optimize array shadow state representations. SlimState is based on the insight...
CMOS technology has found its way in THz imaging applications. Utilizing the plasma wave theory, a MOSFET device can detect THz radiation beyond the cutoff frequency. Assisted by the system-on-packaging technique, a CMOS source delivers radiation power more effectively. An imaging system demonstrates that a low-cost CMOS solution is feasible.
The paper presents the first results from the trigger based on the Discrete Cosine Transform (DCT) operating in the new Front-End Boards with Cyclone V FPGA deployed in 8 test surface detectors in the Pierre Auger Engineering Array.
A continuous-time low-pass sigma-delta modulator (ΣΔM) with a chain of integrators and weighted capacitive feedforward (CICFF) summation topology is fabricated by tsmc 0.18 um CMOS process. This proposed including health transducer with wireless charging and WuRx front-end on tracheostomy tube for microsystems technology in hospital. The summation of feedforward signals is implemented by the weighted...
In multiple source detection of using an array, the threshold of the generalized likelihood ratio test (GLRT) is only related with the noise power. And the false alarm probability will increase when one signal is present in the sidelobe of beamformer's pattern because of energy leakage. A constant false alarm ratio (CFAR) based multiple-source detection algorithm was proposed in this paper. The detection...
An array of GaAs/InGaAs/AlGaAs field-effect transistors with an asymmetric T-gate in each transistor and floating electrodes was fabricated on a single chip and tested as a detector of terahertz (THz) radiation. Principle of detection was based on excitation of plasma oscillations in the common electron channel of the FETs array. Strong terahertz photovoltaic response was demonstrated without any...
Natural Resources Canada has responsibility for mobile survey in response to radiological emergencies in Canada. The team maintains both aerial and truckborne survey systems based on large volume NaI(Tl) gamma detectors integrated with instrumentation for position detection and for environmental monitoring. The team must be able to map the activity concentration of an extended source, whether arising...
The LabPET II front-end module is an avalanche photodiode (APD) based pixelated detector designed to achieve submillimetric spatial resolution in pre-clinical Positron Emission Tomography (PET). This technology is also based on Time-over-Threshold (ToT) signal processing and designed to be used as a generic platform for ultra-high resolution PET imaging of small and medium-size animals. The basic...
We investigate a pointing and tracking approach for an OAM multiplexing free-space communication link based on the measurement of the intensity gradient of the received beam. The OAM intensity gradient-based approach may potentially improve the system's tracking accuracy.
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