Bouncy Balls

Stochastic Bouncy Particle Sampler

We introduce a stochastic version of the nonreversible, rejection-free Bouncy Particle Sampler (BPS), a Markov process whose sample trajectories are piecewise linear, to efficiently sample Bayesian posteriors in big datasets. We prove that in the BPS no bias is introduced by noisy evaluations of the log-likelihood gradient. On the other hand, we argue that efficiency considerations favor a smal...

Meaty Beaty Big and Bouncy

A popular (well at least popular with me) TV show concerns two 'mad' scientists who love nothing more than to explode urban myths. For instance they have investigated the possibility of death by urinating on a live railway line! We could do with something similar in finance. We have a bad habit of accepting theories as fact within finance, of accepting statements as if they were truths. Even wh...

Bouncy: An Interactive Life-Like Pet

Topological Balls

Résumé. Cet article montre comment on peut utiliser la construction de Chu afin de simplifier la construction assez complexe de la catégorie ∗-autonome des boules qui sont réflexives et ζ-ζ∗-complètes donnée par le premier auteur dans les articles [Barr, 1976, 1979]. Abstract. This paper shows how the use of the “Chu construction” can simplify the rather complicated construction of the ∗-autono...

Bouncy knee in a semi-automatic knee lock prosthesis.

The Bouncy Knee concept has previously proved of value when fitted to stabilised knee units of active amputees. The stance phase flex-extend action afforded by a Bouncy Knee increased the symmetry of gait and also gave better tolerance to slopes and uneven ground. A bouncy function has now been incorporated into a knee of the semi-automatic knee lock design in a pilot laboratory trial involving...