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研究生:吳昱緯
研究生(外文):Yu-Wei Wu
論文名稱:基於無線人體區域網路低特定吸收率之省電傳輸路徑機制
論文名稱(外文):A Low-SAR Energy-efficient Transmission Mechanism based on WBAN
指導教授:吳庭育
指導教授(外文):Tin-Yu Wu
口試委員:陳麒元張保榮李維聰許政穆吳庭育
口試委員(外文):Chi-Yuan ChenBao-Rong ChangWei-Tsong LeeJenq-Muh HsuTin-Yu Wu
口試日期:2015-07-29
學位類別:碩士
校院名稱:國立宜蘭大學
系所名稱:資訊工程學系碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2015
畢業學年度:103
語文別:中文
論文頁數:42
中文關鍵詞:無線感測網路無線人體區域網路特定吸收率Dijkstra 演算法
外文關鍵詞:WSNWBANSARDijkstra's Algorithm
相關次數:
  • 被引用被引用:1
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  • 下載下載:3
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隨著近幾年無線網路以及感測器技術快速的提升,研究學者為了收集周遭及監測
環境的資料,而發展出無線感測網路(Wireless Sensor Network, WSN)的技術,而
隨著經濟的發展人們開始越來越注重所謂的身體保健,所以研究人員試著將監測
環境轉移至人體或動物身上,於是制訂出了所謂的無線人體區域網路(WBAN),
而這樣的技術將所有感測節點使用在人體周遭、皮膚表面或者是嵌入到體內以得
到更多生理訊息,並透過無線網路將資料傳輸到後端資料庫的部分供醫護人員所
使用。但在這樣的無線人體區域網路的環境中最大的隱憂就是電力問題,網路的
生命週期取決於耗能的多寡,任何節點的停擺都會造成整體無線人體區域網路的
停擺,這樣的狀況如果發生在醫療用途上可能會對人體造成相當大的危害,並且
也會使系統的可靠度降低,可能會遺失某些重要資訊而危害到生命安全。因此本
研究將研究在無線人體區域網路標準下雙躍(Two-hop)傳輸的傳輸路徑機制,利
用計算整體感測節點的平均剩餘電量來切換感測節點作為中繼節點啟動機制與
否的條件選擇,然而在考量到在無線人體區域網路對於人體項目更加嚴謹,所以
本篇論文透過節點到節點之間訊號傳輸之路徑衰減率並透過各個人體部位之電
磁波吸收率以找出在感測節點的傳輸下傳輸路徑所發出之特定吸收率(Specific
Absorption Rate SAR)值,透過戴克斯特戴克斯特拉演算法 (Dijkstra's Algorithm)
藉由路徑之電量消耗與SAR 值平衡後產生較佳之路徑選擇,以達到無線人體區
域網路整體網路生命週期之均衡以延長系統中節點的存活時間。
With the rapid advancement of wireless networks and sensing technology in recent
years, researchers have developed Wireless Sensor Network (WSN) to gather data for
environmental monitoring. Because the economic growth stimulates people's attention
to health-related issues, researchers have changed their observation target from the
environment to the human or animal body. Wireless Body Area Network, WBAN,
therefore takes shape. Sensors nodes are placed on, in or around the human body to
collect biosignals and the bioinformation is transmitted wirelessly to a back-end
database for medical diagnosis or treatment. However, in the context of WBAN, power
capacity remains a significant problem. The network lifetime is inversely proportional
to power consumption. If any one of the sensor nodes stops working, the network could
possibly stop working, either. For medical purposes, such a situation can reduce the
system reliability, cause significant packet loss and even lead to life-threatening results.
The purpose of this study is to investigate a two-hop transmission mechanism for
WBAN which computes the average residual energy of sensor nodes to decide whether
to switch sensor nodes as the relaying node or not. For WBAN applications that give
special consideration to human body, we first measure the signal decay rate between
nodes and find the SAR level of each transmission path based on the specific absorption
rate (SAR) of each body part. Next, we use Dijkstra's algorithm to balance the power
consumption and SAR level of the path for best path selection that not only optimizes
sensor nodes lifetime but also prolongs the WBAN network life cycle.
目錄
摘要 ................................................................................................................................................... i
ABSTRACT ..................................................................................................................................... ii
誌謝 ................................................................................................................................................. iii
目錄 ................................................................................................................................................. iv
圖目錄 ............................................................................................................................................. vi
表目錄 ............................................................................................................................................ vii
第一章緒論 .................................................................................................................................... 1
1.1 前言 .............................................................................................................................................. 1
1.2 研究動機與目的 ........................................................................................................................... 2
1.3 論文章節架構 ............................................................................................................................... 2
第二章背景介紹與相關研究 ........................................................................................................... 3
2.1 無線人體區域網路(Wireless Body Area Network) ..................................................................... 3
2.2 特定吸收率(Specific Absorption Rate, SAR) ............................................................................ 14
2.3 戴克斯特拉演算法(Dijkstra's Algorithm) ................................................................................ 15
第三章低特定吸收率之省電傳輸路徑機制 .................................................................................. 20
3.1 問題描述 .................................................................................................................................... 20
3.2 機制架構 .................................................................................................................................... 20
3.3 功率消耗模組 ............................................................................................................................. 22
3.4 SAR 計算 .................................................................................................................................... 23
3.5 特定吸收率權重分布圖 ............................................................................................................. 26
3.6 低特定吸收率之省電傳輸路徑.................................................................................................. 27
第四章模擬結果 ............................................................................................................................ 29
4.1 模擬環境設定 ............................................................................................................................ 29
4.2 單躍及雙躍模擬結果 ................................................................................................................ 31
v
4.3 網路存活週期模擬結果 ............................................................................................................. 33
4.4 各機制SAR 累計模擬結果 ........................................................................................................ 35
4.5 動作模擬結果 ............................................................................................................................. 37
4.6 小結 ................................................................................................................................................... 39
第五章總結 .................................................................................................................................. 40
參考文獻 ........................................................................................................................................ 41
目錄
摘要 ................................................................................................................................................... i
ABSTRACT ..................................................................................................................................... ii
誌謝 ................................................................................................................................................. iii
目錄 ................................................................................................................................................. iv
圖目錄 ............................................................................................................................................. vi
表目錄 ............................................................................................................................................ vii
第一章緒論 .................................................................................................................................... 1
1.1 前言 .............................................................................................................................................. 1
1.2 研究動機與目的 ........................................................................................................................... 2
1.3 論文章節架構 ............................................................................................................................... 2
第二章背景介紹與相關研究 ........................................................................................................... 3
2.1 無線人體區域網路(Wireless Body Area Network) ..................................................................... 3
2.2 特定吸收率(Specific Absorption Rate, SAR) ............................................................................ 14
2.3 戴克斯特拉演算法(Dijkstra's Algorithm) ................................................................................ 15
第三章低特定吸收率之省電傳輸路徑機制 .................................................................................. 20
3.1 問題描述 .................................................................................................................................... 20
3.2 機制架構 .................................................................................................................................... 20
3.3 功率消耗模組 ............................................................................................................................. 22
3.4 SAR 計算 .................................................................................................................................... 23
3.5 特定吸收率權重分布圖 ............................................................................................................. 26
3.6 低特定吸收率之省電傳輸路徑.................................................................................................. 27
第四章模擬結果 ............................................................................................................................ 29
4.1 模擬環境設定 ............................................................................................................................ 29
4.2 單躍及雙躍模擬結果 ................................................................................................................ 31
v
4.3 網路存活週期模擬結果 ............................................................................................................. 33
4.4 各機制SAR 累計模擬結果 ........................................................................................................ 35
4.5 動作模擬結果 ............................................................................................................................. 37
4.6 小結 ................................................................................................................................................... 39
第五章總結 .................................................................................................................................. 40
參考文獻 ........................................................................................................................................ 41
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