We demonstrate the capabilities of Bolt, an ultra-low-power processor interconnect for the composable construction of new multi-processor wireless embedded platforms. Bolt provides asynchronous bidirectional communica...
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ISBN:
(纸本)9781450336314
We demonstrate the capabilities of Bolt, an ultra-low-power processor interconnect for the composable construction of new multi-processor wireless embedded platforms. Bolt provides asynchronous bidirectional communication between two processors with predictable message transfer times. In this way, Bolt solves the resource interference problem inherent in today's wireless embedded platforms, enabling simpler and more robust system designs with minimal resource overhead. Using our Bolt prototype implemented on a state-of-the-art microcontroller, we demonstrate Bolt's composability and decoupling in time, power, and clock domains.
We report on a compact passive mode-locked Er:fiber ring laser operated at the fundamental repetition rate of 517 MHz, which we believe is the highest fundamental repetition rate ever reported in a ring cavity fiber *...
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We report on a compact passive mode-locked Er:fiber ring laser operated at the fundamental repetition rate of 517 MHz, which we believe is the highest fundamental repetition rate ever reported in a ring cavity fiber *** key technique is the employment of two innovative high-power wavelength domain multiplexer collimators with all gain fiber cavity suited for the high power(up to 2 W) pumping. The laser is featured with a direct chirpfree output pulse, which is 97 fs without extracavity compression at an average output power of 90 mW.
Sensor networks proved to be a useful research tool in the field of environmental monitoring. While first sensor deployments consisted of a relatively small number of static nodes, mobile sensor devices have attracted...
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ISBN:
(纸本)9781450306492
Sensor networks proved to be a useful research tool in the field of environmental monitoring. While first sensor deployments consisted of a relatively small number of static nodes, mobile sensor devices have attracted growing interest for large-scale sensing applications in recent years. In this paper, we present Ikarus, a novel participatory sensing application having orders of magnitude more users than existing approaches. The Ikarus system exploits sensor data collected during cross-country flights by paraglider pilots to study thermal effects in the atmosphere. Based on first experiences gained from this approach, we identify three key aspects that are crucial for the success of participatory sensing applications: incentives for participation, the ability to deal with faulty data, and concise data representation. Copyright 2011 ACM.
With ever-increasing power densities, temperature management using software and hardware techniques has become a necessity in the design of modern electronic systems. Such techniques have to be validated and optimized...
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ISBN:
(纸本)9781450307154
With ever-increasing power densities, temperature management using software and hardware techniques has become a necessity in the design of modern electronic systems. Such techniques have to be validated and optimized with respect to the thermal guarantee they provide, i.e., a safe upperbound on the peak temperature of the system under all operating conditions. The computation of such a guarantee depends on the power and timing characteristics of the system. In this paper, we present formalisms to capture such characteristics at the system-level and provide an analytical technique to compute a provably safe upper-bound on the peak temperature. The proposed characterization and analysis is general in that it considers an impulse-responsebased thermal model, task-dependent power consumption, tasks with dynamic arrival patterns and variable resource demand, and a scheduling policy expressed as a hierarchical composition of several commonly used policies. Copyright 2011 ACM.
Ever larger collections of music are stored on mobile devices. The process of managing these repositories therefore becomes increasingly challenging. In this work we propose to use a map of the "world of music&qu...
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作者：
Thiele, LotharZurich
Computer Engineering and Networks Laboratory Zurich Switzerland
Power density has been continuously increasing in modern processors, leading to high on-chip temperatures. A system could fail if the operating temperature exceeds a certain threshold, leading to low reliability and e...
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Vehicular ad-hoc networks with inter-vehicular communications are a prospective technology which contributes to safer and more efficient roads and offers information and entertainment services to mobile users. Since l...
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ISBN:
(纸本)9781605581118
Vehicular ad-hoc networks with inter-vehicular communications are a prospective technology which contributes to safer and more efficient roads and offers information and entertainment services to mobile users. Since large real-world testbeds are not feasible, research on vehicular ad-hoc networks depends mainly on simulations. Therefore, it is crucial that realistic mobility models are employed. We propose a generic and modular mobility simulation framework (GMSF). GMSF simplifies the design of new mobility models and their evaluation. Besides, new functionalities can be easily added. GMSF also propose new vehicular mobility models, GIS-based mobility models. These models are based on highly detailed road maps from a geographic information system (GIS) and realistic microscopic behaviors (car-following and traffic lights management). We perform an extensive comparison of our new GIS-based mobility models with popular mobility models (Random Waypoint, Manhattan) and realistic vehicular traces from a proprietary traffic simulator. Our findings leverages important issues the networking community still has to address. Copyright 2008 ACM.
Having access to accurate position information is a key requirement for many wireless sensor network applications. We present SpiderBat, an ultrasound-based ranging platform for wireless sensor networks. It is designe...
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ISBN:
(纸本)9781450303446
Having access to accurate position information is a key requirement for many wireless sensor network applications. We present SpiderBat, an ultrasound-based ranging platform for wireless sensor networks. It is designed to extend existing node platforms with ultrasound ranging capabilities. SpiderBat features four pairs of independently controllable ultrasound transmitters and receivers, which point towards different directions of the compass. Having multiple ultrasound transmitters and receivers provides an increased spatial coverage. Furthermore, our design allows to determine the angle of arrival of an ultrasound wave, which can be exploited for improved accuracy of the positioning. Copyright 2010 ACM.
The sensing range of a sensor is spatially limited. Thus, achieving a good coverage of a large area of interest requires installation of a huge number of sensors which is cost and labor intensive. For example, monitor...
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The permanent growth of personal music collections caused by the ongoing digital revolution asks for novel ways of organization. Traditional list based approaches are- particularly for use in mobile devices-no longer ...
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