sensor temporal mac

ST-MAC: Spatial-Temporal MAC Scheduling for Underwater ...

Underwater sensor networks (UWSNs) have attracted a lot of attention recently. Since data in UWSNs are transmitted by acoustic signals, the characteristics of a UWSN are different from those of a terrestrial sensor network. In other words, the high propagation delay of acoustic signals in UWSNs causes spatial-temporal uncertainty, and makes transmission scheduling in UWSNs a challenging problem.

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Sensor Node - an overview | ScienceDirect Topics

They provide environmental data with high spatio-temporal resolution at the expense of data quality using cheap sensor nodes in large numbers. MEMS microphones are usually the acoustic sensor of choice in WSN implementations due to their low cost, small form factor, and relatively low power consumption. These characteristics are critical in battery-operated sensor nodes where unit costs and ...

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Withings Thermo Smart Temporal Thermometer - Apple (CA)

Thermo measures from the temporal artery, considered the best place to detect temperature changes, because the blood that circulates there comes from the body’s core. No mess, no fuss An exceedingly simple scan across the forehead requires no contact with skin, making it the most sanitary way to take anyone’s temperature.

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DOTS: A Propagation Delay-aware Opportunistic MAC Protocol ...

MAC Protocol for Underwater Sensor Networks Youngtae Noh, ... Under these circumstances, Medium Access Control (MAC) protocols designed for terrestrial packet radio networks cannot be directly used because the propagation delay of acoustic signals is much greater than the packet transmission time (, transmit a 256bytesdata packet with the data rate of 50kbps over a 750m ...

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DCN-MAC: A Dynamic Channel Negotiation MAC Mechanism …

In the design of media access control (MAC) mechanism in underwater acoustic sensor networks (UASNs), due to the propagation characteristic of low-speed underwater acoustic signals, it is necessary to solve the spatial-temporal uncertainty problem. In order to avoid the multi-user access conflict in underwater networks, reduce the energy cost and improve the throughput and fairness across the ...

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Sensors | Free Full-Text | DCN-MAC: A Dynamic Channel ...

In the design of media access control (MAC) mechanism in underwater acoustic sensor networks (UASNs), due to the propagation characteristic of low-speed underwater acoustic signals, it is necessary to solve the spatial–temporal uncertainty problem. In order to avoid the multi-user access conflict in underwater networks, reduce the energy cost and improve the throughput and fairness across ...

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A MAC Protocol of Concurrent Scheduling Based on Spatial ...

2021-01-15· Research Article A MAC Protocol of Concurrent Scheduling Based on Spatial-Temporal Uncertainty for Underwater Sensor Networks Xin Liu ,1,2 Xiujuan Du ,1,3 Meiju Li,1 Lijuan Wang ,1 and Chong Li1 1Computer Department, Qinghai Normal University, Xining 810008, China 2Computer Department, Qinghai Nationalities University, Xining 810007, China 3Academy of Plateau Science …

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Integrated S-AODV and DEL-CMAC Algorithm of Spatio ...

2017-04-07· Integrated S-AODV and DEL-CMAC Algorithm of Spatio Temporal Cross-Layer in Sensor Network. Authors; Authors and affiliations; Shoba Chandra; Suresha Talanki; Kiran Kumari Patil ; Conference paper. First Online: 07 April 2017. 800 Downloads; Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 574) Abstract. Cooperative Medium Access …

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A MAC Protocol of Concurrent Scheduling Based on Spatial ...

Underwater sensor networks (UWSNs) are characterized by large energy consumption, limited power supply, low bit rate, and long propagation delay, as well as spatial-temporal uncertainty, which present both challenges and opportunities for media access control (MAC) protocol design. The time-division transmissions can effectively avoid collisions since different nodes transmit packets at ...

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A Joint Relay Selection and Power Allocation MAC Protocol ...

2020-03-30· Abstract: Different from the mechanism of medium access control (MAC) for the land-based sensor networks, the underwater acoustic sensor network faces problems such as high propagation delay, spatial-temporal uncertainty and high energy consumption. Orthogonal frequency division multiple access (OFDMA) is a channel access mechanism based on OFDM multi-carriers …

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iMac CPU temperature sensor faulty? - Apple Community

2016-09-21· 2016-09-22· iMac, Mac OS X (), Noisy Fan Posted on Sep 21, 2016 10:55 AM ... I'm hoping the intermittent nature of the fan noise (even though it's 99% of the time) may indicate the sensor is unseated. If that's the case there may be no parts required, just a few tools and a steady hand. The fact you suggest I've done my research reassures me I'm probably not missing something obvious, so …

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ST-MAC: Spatial-temporal MAC scheduling for underwater ...

Underwater Sensor Networks (UWSNs) have attracted a lot of attention recently. Since data in UWSNs are transmitted by acoustic signals, the characteristics of a UWSN are different from those of a terrestrial sensor network. In other words, the high propagation delay of acoustic signals in UWSNs causes Spatial-Temporal uncertainty, and makes transmission scheduling in UWSNs a challenging ...

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