Optimal Pricing for Web Search Engines

The research and developments on web search engines have been raised to be one of the hottest topics since the popular usage of the internet. Accordingly, how to price the software becomes an important problem and is still unsolved with satisfactions. Using the Principle-Agent method in economics, the pricing model for web search engines based on the theory of Brown Motion with drifts is established. The stopping time is defined for the model, and the expected benefit of the web-search-engine provider over the rental horizon is derived, with a special case for the outright sale. By maximizing the benefit, the optimal price for the outright sale, the optimal monthly rental and the optimal selling price after renting the search engine for a period of time are discussed. Finally, given sets of parameters, simulations are implemented, and the results show that the optimal prices are reasonable.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000234851600067&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Computer Science, Interdisciplinary ApplicationsComputer Science, Theory & MethodsSCI(E)CPCI-S(ISTP)

A infância na pobreza urbana: linguagem oral e a escrita da história pelas crianças The childhood of urban poverty: verbal language and the children’s writing of the history

Através da convivência com um grupo de 14 crianças entre 3 e 9 anos, em um bairro da periferia de São Paulo, procurou-se verificar a tese de que essas crianças são portadoras de "deficiência de linguagem" devido à pobreza de seu ambiente verbal, da precariedade da linguagem dos adultos e de sua relação verbal com os filhos. O contato com as crianças, com seus pais e com o bairro revelou a complexidade com que elas se utilizam da linguagem verbal; é através dela que elas conquistam seu lugar no mundo dos adultos e sobretudo expressam constantemente suas vivências em seu ambiente próximo. É através de interações verbais muito ricas, do recurso a músicas folclóricas e metáforas, da narrativa dos acontecimentos do bairro e da expressão verbal de suas fantasias e temores que elas se constituem como porta-vozes e como memória viva e coletiva de um bairro no qual a luta não só pela sobrevivência, mas pela vida digna é a principal tarefa que organiza a vida cotidiana.<br>Through the experience of being with a group of children between 3 and 9 years old, in the outskirts of São Paulo, I wanted to verify the thesis that these children are "language impaired" as a consequence of their poor verbal environment, the precarious use of language by parents and the verbal relationship with their children. The contact with the children, the parents and with the neighborhood revealed the complexity in which they use verbal language; it is through the language that the children determine their place in the adult world and above all constantly express their everyday experiences in their surrounding environment. It is through these rich verbal interactions, availability of popular and folklore music and metaphors, narrative occurrences in the neighborhood and the verbal expression of fantasies and fears, that the children become the "spokesmen" of a living and collective memory of the neighborhood. A neighborhood in which the struggle, not only for survival but also for the dignity of life, is the principal task that structures everyday life