Soldiers who are exposed to explosions are at risk of suffering traumatic brain injury (TBI). Since the causal relationship between a blast and TBI is poorly understood, it is critical to have sensors that can accurately quantify the blast dynamics and resulting wave propagation through a helmet and skull that are imparted onto and inside the brain. To help quantify the cause of TBI, it is important to record transient pressure data during a blast event. However,very few sensors feature the capabilities of tracking the dynamic pressure transients due to the rapid change of the pressure during blast events, while not interfering with the physical material layers or wave propagation. In order to measure the pressure transients efficiently, a pressure sensor should have a high resonant frequency and a high spatial resolution. This paper describes an ultra-fast fiber optic pressure sensor based on the Fabry-Perot principle for the application of measuring the rapid pressure changes in a blast event. A shock tube experiment performed in US Army Natick Soldier Research, Development and Engineering Center has demonstrated that the resonant frequency of the sensor is 4.12 MHz, which is relatively close to the designed theoretical value of 4.113 MHz. Moreover, the experiment illustrated that the sensor has a rise time of 120 ns, which demonstrates that the sensor is capable of observing the dynamics of the pressure transient during a blast event.

关键词：光机电；传感器；超快速光纤；高炉事件

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No abstract available.

关键词：光机电；传感器；无线网络；JSC

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今年MWC最吸引消费者眼球的就是各家旗舰智能机、穿戴式装置、4GLTE、智能家庭以及移动支付。

关键词：智能机；穿戴式装置；网通族群；聚焦；LTE

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High resolution calibrated near infrared (NIR) imagery of the Space Shuttle Orbiter was obtained during hypervelocity atmospheric re-entry of the STS-119, STS-125, STS-128, STS-131, STS-132, STS-133, and STS-134 missions. This data has provided information on the distribution of surface temperature and the state of the airflow over the windward surface of the Orbiter during descent. The thermal imagery complemented data collected with onboard surface thermocouple instrumentation. The spatially resolved global thermal measurements made during the Orbiter s hypersonic re-entry will provide critical flight data for reducing the uncertainty associated with present day ground-to-flight extrapolation techniques and current state-of-the-art empirical boundary-layer transition or turbulent heating prediction methods. Laminar and turbulent flight data is critical for the validation of physics-based, semi-empirical boundary-layer transition prediction methods as well as stimulating the validation of laminar numerical chemistry models and the development of turbulence models supporting NASA s next-generation spacecraft. In this paper we provide details of the NIR imaging system used on both air and land-based imaging assets. The paper will discuss calibrations performed on the NIR imaging systems that permitted conversion of captured radiant intensity (counts) to temperature values. Image processing techniques are presented to analyze the NIR data for vignetting distortion, best resolution, and image sharpness.

关键词：光机电；传感器；近红外线感应器；航天飞机

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This chapter presents a reliability model to quantitatively study the reliability of energy-efficient parallel disk systems equipped with the MAID technique. Note that MAID is a well-known effective energy saving schemes for parallel disk systems. It aims to skew I/O load toward a few disks so that the other disks can be transitioned to low power states to conserve energy. I/O load skewing techniques such as MAID inherently affect reliability of parallel disks because disks storing popular data tend to have high failure rates than disks storing cold data. To address the reliability issue in MAID, we developed single disk swapping strategies to improve disk reliability by alternating disks storing hot data with disks holding cold data. In addition, we introduced multiple disk swapping scheme to further improve reliability of MAID. Then, we quantitatively evaluated the impacts of the disk swapping strategies on reliability of MAID-based disk systems.

关键词：高效节能；可靠性模型；并行磁盘系统；磁盘交换策略

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Results obtained with the grant fall into several groupings: (a) Combinatorial conditions on the graphical representation of a two dimensional sensor network that will guarantee localizability of the network in the event of loss of any p sensors and/or q links in the network, for nonnegative integers p and q; (b) analysis of the effects of measurement error on the quality of localization of sensor positions in a sensor network, or more generally a target being localized; (c) the derivation of a measure, including algorithms for computing it, of the quality of connectivity of a network modeled by a graph with nodes and links, and in which the individual links are operative with defined a priori probabilities, and the probability that any one link is operative is independent of the probability that any other link is operative; (d) connectivity and capacity of networks with randomly positioned nodes and probabilistic channel models; (e) Doppler localization problems and miscellaneous multi-agent problems.

关键词：光机电；传感器；智能；网络系统

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To achieve the goal of the proposal, we created nano-structured surfaces to increase the pixel density and hence resolution of the opto- electronic sensor array by a factor of 3 in each direction, x and y. The proof of concept of this mathematical framework in the visible part of the optical spectrum was published in 2 journal articles (both published in Applied Physics Letters). In addition to this, we also experimentally applied the same concept to IR part of the optical spectrum and thus demonstrated the feasibility of our approach for IR focal plane arrays. these results will be presented at SPIE Defense, Security and Sensing Conference in April 2012.

关键词：光机电；传感器；共振亚波；分辨率

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Owing to their size and heterogeneity, large-scale distributed systems require scalable, robust, fault-tolerant, and energy-efficient resource management infrastructures. This chapter presented ERIDIS: an Energy-efficient Reservation Infrastructure for large-scale Distributed Systems. ERIDIS is empowered to optimize the energy consumption of the computing and networking resources and to have a flexible and adaptive reservation management that satisfies user requirements through strict reservation policies.

关键词：高效节能；基础设施网格；资源管理

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In this chapter, we demonstrated how we can embrace the memory wall to address the power wall for scientific computing. We proposed a software approach that provides the active-state power management of the CPU by means of DVFS and takes advantage of sublinear performance scaling in non-CPU activities. In detail, we presented a DVFS algorithm called the β-adaptation algorithm. This PMU-assisted, interval-based algorithm uses a compute-boundedness metric called β to capture the effect of sublinear performance scaling. By design, the algorithm minimizes its dependence on the PMU, which is essential for the portability of the algorithm.

关键词：高效节能；拥抱内存墙；科学计算

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New geolocation methods are needed that will allow accurate location of LPI emitters despite low signal-to-noise ratio (SNR) and multipath propagation. To address this recent work has provided a single-stage localization method called Direct Position Determination (DPD). However, all its computation is concentrated at one computing node. We developed several methods to remedy this problem. To provide even better performance in these challenging real-world scenarios we developed a one-stage TDOA/FDOA localization method based on spatial sparsity of emitters. The proposed sparsity-based method has better performance (especially in multi-path and multi-emitter cases) compared to direct position determination (DPD) and two- stage Classic localization methods.

关键词：光机电；传感器；电子情报；开发

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