In this study, smiles were investigated in eight Chinese and Swedish video-recordings of first encounters. The purpose was to explore features of smile, culture specific as well as those that are common to Chinese and Swedes. We found that the Swedish participants smiled more than the Chinese, and that the Chinese female participants smiled more than the Chinese male participants. Only the Chin...

Abstract A controversy surrounding the “tunnelling time problem” stems from seeming inability of quantum mechanics to provide, in usual way, a definition duration particle is supposed spend given region space. For this reason, problem often approached an “operational” angle. Typically, one tries mimic, case, experiment which yields desired result for classical particle. One such approach based ...

This paper uses duration analysis to estimate emergency room wait times. To account for multi-phrasal hazard, analysis time is fitted in a piecewise model that allows hazard to change power and direction whenever it reaches a periodic length. Such model provides a marginal improvement from other competing models where hazard is assumed to be non-monotone or one-time increasing. Results, from ap...

The publication of Michael Lewis’ Flash Boys in early April, 2014, generated an intense month-long wave of publicity surrounding high frequency trading (HFT) firms, much of it unfavorable. In a typical example, Paul Krugman, writing in a New York Times editorial that appeared just after publication of Flash Boys, conflated HFT trading practices with the proliferation of complex derivatives prod...

During the week of August 6, 2007, a number of quantitative long/short equity hedge funds experienced unprecedented losses. Based on TASS hedge-fund data and simulations of a specific long/short equity strategy, we hypothesize that the losses were initiated by the rapid “unwind” of one or more sizable quantitative equity market-neutral portfolios. Given the speed and price impact with which thi...

In this study a Multi-Objective Evolutionary System is used to predict the future tendency of assets price. Therefore, a framework using a Multi-Objective Genetic Algorithm (GA) in its core to optimize a set of Trading or Investment Strategies (TSs) was developed. The investigated framework is used to determine potential buy, sell or hold conditions in stock markets, aiming to yield high return...

In this paper, we consider a simple cellular automaton with two particles of different speeds that annihilate on contact. Following a previous work by Kůrka et al., we study the asymptotic distribution, starting from a random configuration, of the waiting time before a particle crosses the central column after time n. Drawing a parallel between the behaviour of this automata on a random initial...

Objective This study evaluated the productivity of computed tomography (CT) models and characterized their simplest (entry-level) models' supply in the world market. Methods CT exam times were measured in eight health facilities in the state of Rio de Janeiro, Brazil. Exams were divided into six stages: (1) arrival of patient records to the examination room; (2) patient arrival; (3) patient p...