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Uploaded by
Jack Chen
PPT, PDF
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Wireless Sensor Networks
AI-enhanced description
無線感測器網路可用於火災救援和醫療護理,提供移動物體的位置資訊,以提高效率。其應用包括空間查詢和生還者搜尋,但需克服能源、記憶體和頻寬等限制。有效的查詢處理和資料管理對於提升這些系統的效能至關重要。
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Wireless Sensor Networks
1.
無線感測器網路 (Wireless
Sensor Networks)
2.
Wireless Sensor Networks
當感測器測到火災意外發生時,消防人員將會希望透過佈置在建築中的感測器告知他們位置以及移動方向加快救援的腳步。 醫護人員希望能透過無線感測網路告知他們病患的目前位置。 災區火場溫度、化學濃度 。
3.
sensor network 在
sensor network 環境中, sensor 可提供給使用者關於移動物體 (moving object) 的位置資訊。這是因為許多跟移動物體位置資訊相關的技術已經可以在 sensor network 環境中實現。包括 sensor 可透過無線電 (radio) 或是超音波 (ultrasound) 等感測能力去偵測移動物體的存在, sensor 之間可透過無線網路交換資料,並利用三角定位或其他定位機制來合作決定移動物體的位置,甚至更進一步, sensor 間可運作追蹤策略,得知移動物體的移動路徑。
4.
Location Based Service
Sensor network 除了能提供移動物體資訊之外,更高階的應用就是能讓使用者能隨時查詢 (query) 所需要的移動物體位置資訊。這類針對移動物體位置資訊所下的查詢稱為空間查詢 (spatial query) 。透過 spatial query ,使用者可以獲得與本身位置相關的查詢服務 (Location Based Service) 。 (Location Based Service) LBS 在 sensor network 上的應用相當廣泛,例如在火災現場,消防員可透過即時灑下的 sensors 去搜尋自己附近的生還者,對其進行救援。
5.
http://bwrc.eecs.berkeley.edu/research/pico_radio/ http://dblab.csie.ncku.edu.tw/imus/sensor/index.html
6.
Ultra Low-Power Computation
and Communication enables Ambient Intelligence Area: • 150 kGates (not including memory) • ~ 4 mm2 Clock Frequency: • on-mode: 16 MHz • standby: 32 KHz Power: • 1mW in full on-mode; < 10 μ W in standby
7.
Moving Object Trajectory
Identification in Wireless Sensor Networks 移動物體追蹤 (moving object tracking) 醫療看護的警急通報 肢體動作擷取 (motion capturing) 將幾百萬個 sensor 佈署於森林中,以對任何火災地點的判定提供最快的訊息。
8.
Object Tracking in
Wireless Sensor Networks
9.
問題 由於無線感測網路本身的許多限制
( 如:能量消耗、記憶體、頻寬…等 ) 如何以最節省能源的方式來完成資料的派送 (dissemination) 的工作。 由於前述的查詢將會牽涉到大量 sensor 的互動,因此應該提供一個有效率的查詢處理 (query processing) 機制, 盡可能地減少處理查詢時,所需要動用到的 sensor 個數。 資料的儲存 (storage) 與管理 (management) 。
10.
參考 無線感測器網路
(Wireless Sensor Networks) http://imus.csie.ncku.edu.tw/imus/sensor/sensor_research.html Ultra Low-Power Computation and Communication enables Ambient Intelligence http://bwrc.eecs.berkeley.edu/People/Faculty/jan/presentations/AmbientIntelligence.pdf PicoRadio http://bwrc.eecs.berkeley.edu/research/pico_radio/ Cornell Cougar Project http://www.cs.cornell.edu/boom/2003sp/ProjectArch/CougarMM/publications.php
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