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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. <\/jats:p>","DOI":"10.1155\/2014\/624983","type":"journal-article","created":{"date-parts":[[2014,4,9]],"date-time":"2014-04-09T21:24:38Z","timestamp":1397078678000},"page":"624983","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["An Intelligent Guardrail Context-Awareness System Based on Acceleration Sensors in Ubiquitous Sensor Networks"],"prefix":"10.1177","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5580-4098","authenticated-orcid":false,"given":"Seok-Woo","family":"Jang","sequence":"first","affiliation":[{"name":"Department of Digital Media, Anyang University, 708-113 Anyang 5-dong, Manan-gu, Anyang 430-714, Republic of Korea"}]},{"given":"Sung-Youn","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Digital Media, Anyang University, 708-113 Anyang 5-dong, Manan-gu, Anyang 430-714, Republic of Korea"}]},{"given":"Gi-Sung","family":"Lee","sequence":"additional","affiliation":[{"name":"Division of Computer and Game, Howon University, 64 Howondae 3-gil, Impi-myeon, Gunsan 573-718, Republic of Korea"}]}],"member":"179","published-online":{"date-parts":[[2014,4,9]]},"reference":[{"issue":"5","key":"B1-2014-624983","first-page":"56","volume":"2","author":"Mali S. 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