In this paper we present an economic model of optimal consumption and labour supply where we assume that working may generate stress which affects the wellbeing of the representative individual. As to stress we posit that it is influenced by cumulated past labour and capital. The latter reflects the fact that work-related stress evolves gradually over time and that it is more likely to occur in...

We present a new statistical framework for stochastic grammatical inference algorithms based on a state merging strategy. We propose to use multinomial statistical tests to decide which states should be merged. This approach has three main advantages. First, since it is not based on asymptotic results, small sample case can be specifically dealt with. Second, all the probabilities associated to...

Monthly scarlet fever notifications in Guangdong and Macau were cumulated from December 2010 to December 2011 and then smoothed using cubic spline assuming time points at 15th of each month. Weekly cumulative notifications was estimated by interpolation based on the spline function, which was then differenced to obtain weekly estimated number of notifications from week starting January 16, 2011...

Under increasing competition and pressure for financial self-sufficiency, airports have adopted various strategies. This paper presents a System Dynamics simulation model exploring relationships between airport, airline, and passengers through fares and fees. The case study is a small to medium size international airport (Perth, WA), fully private and light-hand regulated and the model investig...

We introduce two metrics aimed at evaluating systems that select facetvalues for a faceted search interface. Facetvalues are the values of meta-data fields in semi-structured data and are commonly used to refine queries. It is often the case that there are more facetvalues than can be displayed to a user and thus a selection has to be made. Our metrics evaluate these selections based on binary ...

This work is devoted to design a tool that can answer automatically students by using and exploiting past cumulated experiences in past e-learning sessions. This tool constitutes a new component to be incorporated in elearning environments. For instance, this tool will be added to the system we are developing since several years that we have called PERSO. The main objective of PERSO is to intro...

Heat extraction from the Ogachi geothermal resource has been carried out in four test periods following creation of the two-layered stimulated HDR reservoir at depths of about 720 and 1000 m. The tests consist of a 20-day hydraulic communication test in 1993, a ISl-day circulation test in 1994, a 3O-day test in 1995, and lodays of production in the summer testing of 1997. The heat extracted fro...

The estimation of the correlation between time series is often hampered by the asynchronicity of the signals. Cumulating data within a time window suppresses this source of noise but weakens the statistics. We present a method to estimate correlations without applying long time windows. We decompose the correlations of data cumulated over a long window using decay of lagged correlations as calc...

c. Determine the quantiles (Q) associated to the following series of cumulated relative frequencies: 1x10, 1x10, 1x10, 1x10, 1x10, 0.25, 0.5, 0.75, 0.99, 0.999, 0.9999, 0.99999, 0.999999). To this aim we used the program Matlab v.7.10 (Mathworks, USA). Although “relative frequencies” and “probabilities” are different mathematical entities (i.e., probabilities are the asymptotic limit of the rel...

Abstract The creation of cavities in the underground results stress redistributions and energy changes rock mass. Zones with increased stresses zones lower develop. manifest themselves amongst others potential energy, absorption formation fracture zones, release such as seismic energy. To prevent damage to infrastructure personnel, it is important understand mechanisms a result mining. As far c...