An ensemble regression approach for bus trip time prediction

This paper is about bus trip time prediction in mass transit companies.We describe the motivations to accomplish this task and how it can supportoperational management on such companies. Then, we describe a Data Miningframework that recommends the expected best regression algorithm(s), from anensemble, to predict the duration of a given trip. We present results that show theadvantage of using an ensemble regression approach

Trip time prediction in mass transit companies. A machine learning approach

In this paper we discuss how trip time prediction can be useful foroperational optimization in mass transit companies and which machine learningtechniques can be used to improve results. Firstly, we analyze which departmentsneed trip time prediction and when. Secondly, we review related work and thirdlywe present the analysis of trip time over a particular path. We proceed by presentingexperimental results conducted on real data with the forecasting techniques wefound most adequate, and conclude by discussing guidelines for future work

Informações sobre as cultivares de trigo recomendadas para plantio em 1988 no Rio Grande do Sul.

bitstream/item/119410/1/FOL-06007.pd

Concentração nas atividades agropecuárias de Goias entre 1996-2006: implicações para o desenvolvimento rural sustentável.

Resumo: O estudo procura avaliar as transformações estruturais na agropecuária de Goiás na última década, destacando a elevada concentração do uso da terra e sua sensível piora entre 1996 e 2006. Em 2006, os pequenos estabelecimentos (com até 200 hectares) somaram 81,85% e 19,79% da área de cultivo e criação. As Curvas de Lorenz e os Coeficientes de Gini calculados mostram maior assimetria nas atividades de florestas plantadas e lavouras temporárias. Goiás tem 65,2% dos estabelecimentos dirigidos por produtores familiares com posse de apenas 13% da área de cultivo, mas que empregam 68,37% da mão-de-obra rural. Em contraste, as grandes propriedades geram apenas 14,36% dos postos de trabalho. O modelo agrário e as políticas de crédito rural adotados ajudam a explicar a elevada concentração fundiária. Uma alternativa plausível para mitigar tais contrastes é apoiar mais efetivamente a agricultura familiar e os produtores rurais de menor porte, que têm importante papel na produção agrícola para o atendimento do mercado interno e na geração de renda e emprego para a população rural. Esta pode ser uma estratégia de desenvolvimento capaz de promover sistemas produtivos locais mais eficientes e de proporcionar uma maior igualdade econômico-social no Estado. Concentration ratio in agricultural activities in Goiá during 1996-2006: implications for sustainable rural development. Abstract - The study aims to evaluate the structural changes in Goiás´s agricultural sector in last decade, underling the high concentration ratio in land use and its sustainable growth between 1996-2006. In 2006, farms less than 200 hectares added up to 81.85% and 19.79% of the agricultural area. The Lorenz Curves and Gini Ratios showed greater asymmetry in planted forests and temporary crops. Goiás has 65.2% of the production units run by family farmers which accounted for only 13% of the cultivated area, but has employed 68.37% of rural labor force. In contrast, large production units generated only 14.36% of the rural jobs. The agrarian model and the design of government agricultural programs may have a key role in explaining the high concentration in Goiás´s farm structure. A possible way to diminish these disparities is to support more effectively small-scale farmers and familiar rural producers that play an important role in generating food for the domestic market and employment and income for rural population. This may be a strategic policy to promote efficient local production systems and less socioeconomic inequalities in Goiás State

Finding interesting contexts for explaining deviations in bus trip duration using distribution rules

Lecture Notes in Computer Science Volume 7619, 2012.In this paper we study the deviation of bus trip duration and its causes. Deviations are obtained by comparing scheduled times against actual trip duration and are either delays or early arrivals. We use distribution rules, a kind of association rules that may have continuous distributions on the consequent. Distribution rules allow the systematic identification of particular conditions, which we call contexts, under which the distribution of trip time deviations differs significantly from the overall deviation distribution. After identifying specific causes of delay the bus company operational managers can make adjustments to the timetables increasing punctuality without disrupting the service.(undefined

SHORT-TERM SOCIAL ISOLATION DOES NOT REDUCE ELEVATED PLUS-MAZE EXPLORATION IN EARLY PROTEIN MALNOURISHED RATS

An increased number of visits and time spent in the open arms of the elevated plus-maze by malnourished rats has been used as indicative of lower anxiety or impulsiveness. In order to study how this behavior profile responds to an anxiogenic procedure (short-term social isolation), control (16% protein) and malnourished (6% protein) rats were socially isolated prior to the test in the maze. Litters (dam plus 6 male 2 female pups) were fed the diets from birth to 49 days of age. From 50 days on, all rats were fed a lab chow diet. Social isolation consists in removing the rats from the group and placing in individual cages for 2h before the test. During the test each rat was individually placed on the center of the maze and allowed to explore for 5 min. The results showed higher open arms exploration and lower attempts to enter open arms by the malnourished rats than by the controls. Social isolation decreased open arm exploration and increased time spent on the central platform in control animals, but had no effect on the malnourished rats. The results reinforce the lower anxiety or higher impulsiveness of malnourished rats, as well as the anxiogenic effect of social isolation in control rats. However, the malnourished rats were unresponsive to the anxiogenic effects of social isolation, indicating that protein deficiency early in life not only induces lower anxiety or higher impulsiveness in the maze, but also changes the behavior of these animals in response to another environmentally-induced procedure of anxiety (social isolation). Keywords: Early protein malnutrition, Social isolation, Anxiety, Impulsiveness, Stress, Rats.