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, to generate answers to such questions. In this study, we report the evaluation of a new weighted-keyword model for improving our question answering system. As part of this development, a physician manually examined AskHERMES' answers to 20 ad hoc clinical questions created with and without the weighted-keyword model
community. Interest communities will reorganize as any user's interest has changed. Simulation results show this model has higher search efficiency and lower search cost compared with traditional keyword search algorithm.
In recent years, the listing service is widely used in search site such as Yahoo!, Google, and MSN. In the list service, Advertising rate and advertising order are decided by the auction that is called Generalized Second Price Auction (GSP). There are a lot of researches on GSP. However, in those researches, the advertisement is mutually independent. Additionally, the value of advertisement is not...
Extended Boolean retrieval (EBR) models were proposed nearly three decades ago, but have had little practical impact, despite their significant advantages compared to either ranked keyword or pure Boolean retrieval. In particular, EBR models produce meaningful rankings; their query model allows the representation of
This paper presents method for split-step backward Euler scheme in regime-switching models. We generalize the classical Black-Scholes model to encompass regime-switching properties. The Black-Scholes model is shown to generate significant pricing errors when a regime-switching process governs underlying asset returns. In addition, regime-switching option values are shown to generate implied volatility...
based on statistical method, the expression of semantic relations between different keywords, the description of document semantic vectors and the similarity calculating, etc. Finally, the experimental results show that the retrieval ability of our new model has significant improvement both on recall and precision.
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