Browsing by Subject "Estimation algorithm"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemUnknown
    LineKing: Crowdsourced line wait-time estimation using smartphones
    (Springer, 2013) Bulut, M. F.; Yilmaz, Y. S.; Demirbaş, M.; Ferhatosmanoğlu, N.; Ferhatosmanoğlu, Hakan
    This 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.
  • Thumbnail Image
    ItemOpen Access
    A novel and robust parameter training approach for HMMs under noisy and partial access to states
    (Elsevier BV, 2014-01) Ozkan, H.; Akman, A.; Kozat, S. S.
    This paper proposes a new estimation algorithm for the parameters of an HMM as to best account for the observed data. In this model, in addition to the observation sequence, we have partial and noisy access to the hidden state sequence as side information. This access can be seen as "partial labeling" of the hidden states. Furthermore, we model possible mislabeling in the side information in a joint framework and derive the corresponding EM updates accordingly. In our simulations, we observe that using this side information, we considerably improve the state recognition performance, up to 70%, with respect to the "achievable margin" defined by the baseline algorithms. Moreover, our algorithm is shown to be robust to the training conditions. © 2013 Elsevier B.V.