By using a sensor connected to a generic wireless embedded Internet system (EIS) platform, data can be presented on-line over the Internet using a standard WWW-browser. When started, the EIS device automatically searc...
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By using a sensor connected to a generic wireless embedded Internet system (EIS) platform, data can be presented on-line over the Internet using a standard WWW-browser. When started, the EIS device automatically searches and connects to other devices providing Internet connectivity. The EIS can also provide Internet access for other devices, for example other EIS platforms, thus creating a local network. In this paper we focus on mobile phones with GPRS as the means for wireless Internet connectivity as it provides enhanced area coverage in today's networks. To overcome the problem of non-public IP addresses, a basic server based solution is developed. Our experiments confirm that within GPRS coverage, the EIS device successfully provides Internet access and presents data for on-line monitoring over the Internet.
Traditional low-power wireless protocols maintain distributed network state to cope with link dynamics. Modeling the protocol operation as a function of network state is difficult as the state is frequently updated in...
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ISBN:
(纸本)9781450320276
Traditional low-power wireless protocols maintain distributed network state to cope with link dynamics. Modeling the protocol operation as a function of network state is difficult as the state is frequently updated in an uncoordinated fashion. Recent protocols use synchronous transmissions (st): multiple nodes send simultaneously towards the same receiver, as opposed to pairwise link-based transmissions (LT). st enable efficient multi-hop protocols with little network *** studied whether st in Glossy enable simple yet accurate protocol modeling [10]. Based on extensive testbed experiments and statistical analyses, we found that: (i) unlike LT, packet receptions and losses with st largely adhere to a sequence of independent and identically distributed (i.i.d.) Bernoulli trials; (ii) this property greatly simplifies accurately modeling st-based protocols, as we demonstrated by obtaining model errors below 0.25% in energy for the Glossy-based Low-Power Wireless Bus (LWB).
embedded mobile systems for analysis and classification become more and more important in the field of sports and sports science. Small and lightweight sensors in sportswear offer the possibility to monitor the athlet...
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ISBN:
(纸本)9781467322164
embedded mobile systems for analysis and classification become more and more important in the field of sports and sports science. Small and lightweight sensors in sportswear offer the possibility to monitor the athletes in a realistic environment, e.g. during an outdoor run. During the activity, the sportswear can automatically adapt to the current environment and hence optimizes the performance of the athlete. A major need is a running shoe, which can automatically be adapted to the current ground. In this paper, a classification system was developed, which distinguished between different surfaces and inclinations based on inertial sensors. They were placed on the heel of a running shoe and acquired kinematic data of 21 subjects. For each subject, several rounds of an one hour outdoor run were available and were used for the evaluation of the system. The classification system reached a mean classification rate of more than 80 %.
An optical system for in vivo use with implanted microsphere sensors has been developed, utilizing a fiber probe to measure fluorescence emitted from sensors embedded in skin tissue. The optical system possesses high ...
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An optical system for in vivo use with implanted microsphere sensors has been developed, utilizing a fiber probe to measure fluorescence emitted from sensors embedded in skin tissue. The optical system possesses high signal-to-noise and is faster than commercial instruments. The device will be used in evaluation of hydrogel-encapsulated fluorescent sensors for glucose determination.
Secondary imagery dissemination (SID) is the process of post-collection and electronic dissemination of digital imagery and associated data. SID systems (SIDS) provide exploited, non-original, annotated, anonymous-sou...
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ISBN:
(纸本)0780365216
Secondary imagery dissemination (SID) is the process of post-collection and electronic dissemination of digital imagery and associated data. SID systems (SIDS) provide exploited, non-original, annotated, anonymous-source imagery from intelligence, fusion, and dissemination centers. Ultra-high frequency (UHF) operation penetrates double-canopy jungle or heavy rain to provide imagery from an INTEL center to highly-mobile tactical users. The evolutionary path of UHF SIDS commenced with a system based on previously-fielded equipment for tactical battlefield commanders receiving intelligence information over tactical related applications (TRAP) data dissemination system (TDDS) receivers. As tactical transceivers appeared in the inventory, SIDS networks migrated to dedicated satellite communications (SATCOM) receivers with embedded cryptography giving users talk-back capability for query or tasking the imagery sensor or data fusion center. In concert with the desire for users to share the scarce resource of available SATCOM channels, the SIDS roadmap is turning to DAMA networks for assignment to a wideband (25 kHz) demand-assigned single-access (DASA) channel for transfer of large, compressed imagery files. The near-term hope of re-mining available UHF SATCOM assets for greater bandwidth appears to be feasible with the advent of continuous phase modulation (CPM). Long-term solutions lie in the plans for the mobile user objective system (MUOS). The key to SIDS interoperability is the ability of mandated image formatting and communication protocols to embrace COTS initiatives.
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