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S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations
Beyond Moore's technologies: operation principles of a superconductor alternative
The predictions of Moore's law are considered by experts to be valid until
2020 giving rise to "post-Moore's" technologies afterwards. Energy efficiency
is one of the major challenges in high-performance computing that should be
answered. Superconductor digital technology is a promising post-Moore's
alternative for the development of supercomputers. In this paper, we consider
operation principles of an energy-efficient superconductor logic and memory
circuits with a short retrospective review of their evolution. We analyze their
shortcomings in respect to computer circuits design. Possible ways of further
research are outlined.Comment: OPEN ACCES
Functionality-power-packaging considerations in context aware wearable systems
Wearable computing places tighter constraints on architecture design than traditional mobile computing. The architecture is described in terms of miniaturization, power-awareness, global low-power design and suitability for an application. In this article we present a new methodology based on three different system properties. Functionality, power and electronic Packaging metrics are proposed and evaluated to study different trade offs. We analyze the trade offs in different context recognition scenarios. The proof of concept case study is analyzed by studying (a) interaction with household appliances by a wrist worn device (acceleration, light sensors) (b) studying walking behavior with acceleration sensors, (c) computational task and (d) gesture recognition in a wood-workshop using the combination of accelerometer and microphone sensors. After analyzing the case study, we highlight the size aspect by electronic packaging for a given functionality and present the miniaturization trends for ‘autonomous sensor button
Design and evaluation of a person-centric heart monitoring system over fog computing infrastructure
Heart disease and stroke are becoming the leading cause of death worldwide. Electrocardiography monitoring devices (ECG) are the only tool that helps physicians diagnose cardiac abnormalities. Although the design of ECGs has followed closely the electronics miniaturization evolution over the years, existing wearable ECG have limited accuracy and rely on external resources to analyze the signal and evaluate heart activity. In this paper, we work towards empowering the wearable device with processing capabilities to locally analyze the signal and identify abnormal behavior. The ability to differentiate between normal and abnormal heart activity significantly reduces (a) the need to store the signals, (b) the data transmitted to the cloud and (c) the overall power consumption. Based on this concept, the HEART platform is presented that combines wearable embedded devices, mobile edge devices, and cloud services to provide on-the-spot, reliable, accurate and instant monitoring of the heart. The performance of the system is evaluated concerning the accuracy of detecting abnormal events and the power consumption of the wearable device. Results indicate that a very high percentage of success can be achieved in terms of event detection ratio and the device being operative up to a several days without the need for a recharge
EndoTOFPET-US a Novel Multimodal Tool for Endoscopy and Positron Emission Tomography
The EndoTOFPET-US project aims to jointly exploit Time-Of-Flight Positron
Emission Tomography (TOFPET) and ultrasound endoscopy with a multi-modal
instrument for the development of new biomarkers for pancreas and prostate
oncology. The paper outlines the functionality of the proposed instrument and
the challenges for its realization. The high level of miniaturization and
integration poses strong demands to the fields of scintillating
crystallography, ultra-fast photon detection, highly integrated electronics and
system integration. Solutions are presented to obtain a coincidence time
resolution better than 200 ps and a spatial resolution of ~1 mm with an
asymmetric TOFPET detector. A tracking system with better than 1 mm spatial
resolution precision enables the online alignment of the system. The detector
design, the production and test status of the single detecto
SecuCode: Intrinsic PUF Entangled Secure Wireless Code Dissemination for Computational RFID Devices
The simplicity of deployment and perpetual operation of energy harvesting
devices provides a compelling proposition for a new class of edge devices for
the Internet of Things. In particular, Computational Radio Frequency
Identification (CRFID) devices are an emerging class of battery-free,
computational, sensing enhanced devices that harvest all of their energy for
operation. Despite wireless connectivity and powering, secure wireless firmware
updates remains an open challenge for CRFID devices due to: intermittent
powering, limited computational capabilities, and the absence of a supervisory
operating system. We present, for the first time, a secure wireless code
dissemination (SecuCode) mechanism for CRFIDs by entangling a device intrinsic
hardware security primitive Static Random Access Memory Physical Unclonable
Function (SRAM PUF) to a firmware update protocol. The design of SecuCode: i)
overcomes the resource-constrained and intermittently powered nature of the
CRFID devices; ii) is fully compatible with existing communication protocols
employed by CRFID devices in particular, ISO-18000-6C protocol; and ii) is
built upon a standard and industry compliant firmware compilation and update
method realized by extending a recent framework for firmware updates provided
by Texas Instruments. We build an end-to-end SecuCode implementation and
conduct extensive experiments to demonstrate standards compliance, evaluate
performance and security.Comment: Accepted to the IEEE Transactions on Dependable and Secure Computin
A passive GHz frequency-division multiplexer/demultiplexer based on anisotropic magnon transport in magnetic nanosheets
The emerging field of magnonics employs spin waves and their quanta, magnons,
to implement wave-based computing on the micro- and nanoscale. Multi-frequency
magnon networks allow for parallel data processing within single logic elements
whereas this is not the case with conventional transistor-based electronic
logic. However, a lack of experimentally proven solutions to efficiently
combine and separate magnons of different frequencies has impeded the intensive
use of this concept. In this Letter, we demonstrate the experimental
realization of a spin-wave demultiplexer enabling frequency-dependent
separation of GHz signals. The device is based on two-dimensional magnon
transport in the form of spin-wave beams in unpatterned magnetic nanosheets.
The intrinsic frequency-dependence of the beam direction is exploited to
realize a passive functioning obviating an external control and additional
power consumption. This approach paves the way to magnonic multiplexing
circuits enabling simultaneous information transport and processing.Comment: 16 pages, 3 figure
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