Bulut, M. F.Yilmaz, Y. S.Demirbaş, M.Ferhatosmanoğlu, N.Ferhatosmanoğlu, Hakan2016-02-082016-02-08201318678211http://hdl.handle.net/11693/28018Conference name: 4th International Conference, MobiCASE 2012Date of Conference: 11-12 October 2012This paper describes the design, implementation and deployment of LineKing (LK), a crowdsourced line wait-time monitoring service. LK consists of a smartphone component (that provides automatic, energy-efficient, and accurate wait-time detection), and a cloud backend (that uses the collected data to provide accurate wait-time estimation). LK is used on a daily basis by hundreds of users to monitor the wait-times of a coffee shop in our university campus. The novel wait-time estimation algorithms deployed at the cloud backend provide mean absolute errors of less than 2-3 minutes. © 2013 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.EnglishCrowdsourced sensingSmartphone applicationsWait-time estimationCoffee shopsCrowdsourced sensingEnergy efficientEstimation algorithmMean absolute errorMonitoring servicesSmart-phone applicationsUniversity campusMobile computingSignal encodingSmartphonesEstimationConference Paper10.1007/978-3-642-36632-1_12