This letter deals with the estimation of a flat fading Rayleigh channel with Jakes’s spectrum. The channel is approximated by a first-order autoregressive (AR(1)) model and tracked by a Kalman Filter (KF). The common method used in the literature to estimate the parameter of the AR(1) model is based on a Correlation Matching (CM) criterion. However, for slow fading variations, another criterion...

The hierarchical model of achievement motivation proposes that, in addition to need achievement, fear of failure (FF) energizes achievement behaviour and predisposes individuals to adopt particular types of achievement goals. An impressive volume of cross-sectional support for this model has emerged, however, the causal assumptions of the model have never been tested. College students (N /356) ...

Aerial recovery of micro air vehicles (MAVs) presents a challenging problem in multi-vehicle dynamics and control. This paper presents a method for recovering MAVs in ight using a mothership and towed drogue, in which the mothership executes an orbit that places the drogue in a stable, slower orbit that can be tracked by a MAV. A method for modeling the dynamics of the mothership-cabledrogue sy...

Course estimation is a key component for the development of autonomous navigation systems robots. While state-of-the-art methods widely use visual-based algorithms, it worth noting that most fail to deal with complexity real world. They often require obstacles be highly textured improve overall performance, particularly when obstacle located within focus expansion (FOE) where optic flow (OF) al...

Recently, we have implemented a computervision based horizon-tracking algorithm for flight stability and autonomy in Micro Air Vehicles (MAVs) [1]. Occasionally, this algorithm fails in scenarios where the underlying Gaussian assumption for the sky and ground appearances is not appropriate. Therefore, in this paper, we present a general statistical image modeling framework which we use to build...

purpose this study investigated the effects of time-of-day on aerobic and anaerobic performances during the yo-yo, repeated sprint ability (rsa) and the wingate tests in young soccer players. methods in a counterbalanced and a random order, twenty junior male soccer players completed the yo-yo, the rsa, and the wingate tests at two different times-of-day: 07:00 and 17:00 h. during the yo-yo tes...