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The main bottleneck to achieve energy autonomy in body area networks (BAN) is the design of an ultra low power yet reliable wireless system. In this paper, we first demonstrate the feasibility of an ultra low power receiver by presenting our implemented receiver chip that could operate on a total power of 479.5 uW, which is more than one order of magnitude lower than commercially available low power...
Recently the remarkable development of NAND flash technology makes possible the advent of SSD (solid-state device) that is considered to replace traditional HDD, due to its potential benefits such as low-power usage and reliability. In this paper, we present a hybrid file system, called hybridFS, whose primary objective is to put together attractive features of both HDD and SSD devices, to construct...
This paper proposes a simple and practical RAID reconstruction optimization scheme, called JOurnal-guided Reconstruction (JOR). JOR exploits the fact that significant portions of data blocks in typical disk arrays are unused. JOR monitors the storage space utilization status at the block level to guide the reconstruction process so that only failed data on the used stripes is recovered to the spare...
This paper presents a novel method for evaluating facilities in regard to their designed intelligence. Facilities intelligence is defined as the designed capacity of a facility to acquire and process data and information to perform its adaptability to life-cycle circumstance changes in terms of people's requirements of well-being and energy efficiency. This definition is then formulated to quantify...
This paper presents the results of extensive simulations on the characterization of asymmetrical channel device, namely Dual material Gate Fully Depleted Silicon On Insulator (DMG-FD-SOI) in the sub-100nm dimensions with emphasis on the analog, radio frequency (RF) performances and short channel effects (SCEs). The obtained results may serve as useful guidelines to get a basis overview of this gate-material...
This paper describes the design of a GaAs monolithic high power amplifier at Ku band. The chip delivers about 40 dBm of saturated output power, in CW operating conditions, at 11.7 GHz central frequency, with 17% of bandwidth. The saturated power gain is 12.4 dB with 2 dB gain flatness across the application bandwidth while the chip power added efficiency is estimated between 33% to 47%. The amplifier...
Cosmic-ray induced soft errors in cache memories are becoming a major threat to the reliability of microprocessor-based systems. In this paper, we present a new method to accurately estimate the reliability of cache memories. We have measured the MTTF (mean-time-to-failure) of unprotected first-level (L1) caches for twenty programs taken from SPEC2000 benchmark suite. Our results show that a 16 KB...
The InfiniBand architecture (IBA) is a new industry-standard architecture for server I/O and interprocessor communication. InfiniBand is very likely to become the de facto standard in a few years. It is being developed by the InfiniBandSM Trade Association (IBTA) to provide the levels of reliability, availability, performance, scalability, and quality of service (QoS) necessary for present and future...
This paper describes one method to select equipment data and to use engineering tools to design, verify or validate Emergency Shutdown System (ESS) performance. The paper demonstrates how to in a manner that is easy to follow and understand, thus allowing users to duplicate the approach in a way that reflects their company's operating environment and needs. A hierarchy of equipment data sources...
The Quantitative Expert System Tool (QUEST) provides automated support for quantitative evaluation and tradeoff analysis of complex computer system designs. Three basic components are provided. The design capture component is based on an information model that incorporates performance, dependability, and cost considerations within a single, integrated representation. The quantitative modeling and...
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