An Intelligent Guardrail Context-Awareness System Based on Acceleration Sensors in Ubiquitous Sensor Networks

Abstract

A ubiquitous city (u-City) is a next-generation information-based city that combines state-of-the-art IT (information technology) infrastructures and ubiquitous information services. In general, the urban facilities of a u-City can be categorized into ground and underground facilities. This paper proposes a guardrail context-awareness system based on the analysis of acceleration sensors to manage guardrails systematically. Guardrails are one of the major ground facilities in a u-City. The suggested system generates alarms when acceleration sensors on guardrails recognize a certain level of physical shock. General information on the size and direction from the acceleration sensors is transmitted to the context-awareness system. The context-awareness system analyzes the scalar magnitude of the impacted shock, acceleration values to the x, y, and z directions, gravity direction of the sensors, and threshold values. It then determines if there is pronounced physical activity on the guardrail. Experimental results show that the suggested guardrail context-awareness approach accurately recognizes guardrail shock events that occur in various environments.

Ontological MobiHealth System

“…In BAN, the sensors regularly communicate information to the base station (i.e., smart phones in this study). Therefore, BANs have different applications, including postoperative care, sports health management, and home-based care for the elderly [5], [6]. In this research, three types of sensors were used as follows: (1) physiological sensors for vital signs, such as ECG, PPG, and SPO2; (2) motion detection sensors for situations such as accelerometer; (3) environmental sensors such as CO, O2, temperature, and humidity.…”