由於醫學的高度進步，使得年老的人佔世界各國的人口比例愈來愈高；因此，如何在一個不侵犯隱私的前提下，監測獨居老人的安全情形，並給予適時的幫助，便成為越來越重要的課題。
本研究中讓獨居老人攜帶的子系統包含兩個電容式加速度計(ADXL202E)，一個ALTERA編號為EPF10K的高速FPGA，和一個433.92MHz的RF無線發射器。當感測模組偵測到產生劇烈的加速度變化(例如跌倒)，或是超過一個小時的異常靜止時(例如昏迷)，感測器會先發出警告聲，確認是否發生異常狀況，倘若使用者沒有按下RESET時，處理電路會經由RF模組發出需要幫助的訊息，再經由RF接收模組將此訊息傳送至電腦，以LabVIEW撰寫的監控程式會即時透過網際網路轉送求救信號給遠端的醫院或家屬，給予使用者適時的幫助。

Because of highly progress of medicine, the proportion of the elderly is getting higher in every country；therefore, it will become a more and more important subject that how to monitor solitary elderly people so as to bring them more security and safety without disturbing their life.
A subsystem of our study taken along by solitary elderly people employs two capacitive accelerometers (ADXL202E), a high speed FPGA chip EPF10K and a 433.92MHz RF transmitter. As soon as the unusually violent or motionless movement is detected, this system will give an alarm to user to make sure whether he or she is in danger or not. Once the user doesn’t press the RESET button, the emergency signal will be sent to computer via RF transceiver module. And the monitoring program written in LabVIEW will deliver an SOS to their family or hospital by way of internet for timely help.

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