Yixuan Zhai

Learn More
—We consider the dynamic search of a target located in one of K cells. At each time, one cell is searched, and the search result is subject to false alarms. The objective is a policy that governs the sequential selection of the cells to minimize the error probability of detecting the whereabouts of the target within a fixed time horizon. We show that the(More)
—We consider a dynamic pricing problem with unknown demand models. In this problem, a seller offers prices sequentially to a stream of potential customers and observes either success or failure in each sales attempt. The underlying demand model is unknown and can take one of two possible forms. We show that the problem can be formulated as a two-armed(More)
We consider a dynamic pricing problem under unknown demand models. In this problem a seller offers prices to a stream of customers and observes either success or failure in each sale attempt. The underlying demand model is unknown to the seller and can take one of N possible forms. In this paper, we show that this problem can be formulated as a multi-armed(More)
OBJECTIVE To investigate surgical (aspiration and resection) outcome of encapsulated brain abscess in superficial non-eloquent area. METHODS We searched Pubmed, Embase and Cochrane Library from the foundation of the database till December 2013. Two researchers screened literatures independently, assessed the quality of the included studies and extracted(More)
OBJECTIVE Chordomas in children and adolescents are extremely uncommon, and minimal published information is available. Therefore, our aim was to research clinical features and prognostic factors associated with clival chordomas in younger patients. METHODS The study included 25 patients (10 males and 15 females). The average follow-up was 42.95 months(More)
  • 1