In regression models for ordinal response, each covariate can be equipped with either a simple, global effect or a more flexible and complex effect which is specific to the response categories. Instead of a priori assuming one of these effect types, as is done in the majority of the literature, we argue in this paper that effect type selection shall be data-based. For this purpose, we propose a...

This paper presents a model of brain systems underlying reaching in monkeys based on the idea that complex behaviors are built on the basis of a repertoire of motor primitives organized around specific goals (in this case, arm’s postures). The architecture of the system is based on an actorcritic reinforcement-learning model, enhanced with an accumulator model for action selection, capable of s...

A large part of current research i n to autonomous control is concerned with building agents that can perform useful functions in real-world domains. Consequently, the behaviour of the system must be exiblee the behaviour of an agent m ust reeect changes in context. This position paper is concerned with the use of motivation as a control mechanism in goal and action selection within an artiicia...

An extensive experimental investigation is conducted to study the effect of canard position relative to the fuselage reference line on the aerodynamic forces of a fighter type configuration model. Aerodynamic forces at different flight conditions are measured in a subsonic wind tunnel. The wing and the canard have triquetrous shapes. Experiments are conducted at Reynolds number of 342209 and at...

Let f(n, l) be the maximum integer such that every set of n points in the plane with at most l collinear contains a subset of f(n, l) points with no three collinear. First we prove that if l 6 O( √ n) then f(n, l) > Ω( √ n ln l ). Second we prove that if l 6 O(n) then f(n, l) > Ω( √ n logl n), which implies all previously known lower bounds on f(n, l) and improves them when l is not fixed. A mo...