Background: Noise as a most common harmful physical agent in workplaces has some effects on the exposed persons such as hearing threshold reduction, increasing blood pressure, and interference with the speech. The adverse side-effect of noise is one of the scientific areas that have seldom been considered by researchers. The aim of this study was to investigate the effects of occupational noise...

We study the coupling of basic quantitative portfolio selection strategies with a financial news article prediction system, AZFinText. By varying the degrees of portfolio formation time, we found that a hybrid system using both quantitative strategy and a full set of financial news articles, performed the best. With a 1-week portfolio formation period we achieved a 20.79% trading return using a...

We consider a two-sided matching market in which the traders are partitioned into two sets; the set of sellers and the set of buyers. Each seller owns at most one indivisible good and each buyer owns a certain amount of money. Money is assumed to be an integer variable. Each trader can trade with at most one trader of the opposite side. The marriage model of Gale and Shapley is a special case o...

background : noise exposure is the most frequent occupational factor which may increase the risk of work-related injuries. the purpose of this study was to estimate the association between occupational injuries and noise exposure as well as hearing loss. methods : this study was conducted from april 2008 to march 2009 on 1062 workers in the tabriz tractor manufacturing plant. sound pressure lev...

This paper demonstrates that it is possible to build a trading service which allows users to access objects of remote distributed systems. This service is an extension to an original RHODOS trader which provides the maximum possible autonomy and flexibility to users yet at the same time allows them to share all accessible objects (resource, service) within a local distributed computer system. W...

Investor sentiment index based on actual trader positions is useful for forecasting S&P 500 index futures returns. We find that large speculator sentiment is a price continuation indicator, whereas large hedger sentiment is a weak contrary indicator. Small trader sentiment does not forecast returns. We show that extreme levels and the combination of extreme levels of sentiments of the two types...

We develop a High Frequency (HF) trading strategy where the HF trader uses her superior speed to process information and to post limit sell and buy orders. We introduce a multi-factor self-exciting process which allows for feedback effects in market buy and sell orders and the shape of the limit order book (LOB). The model accounts for arrival of market orders that influence activity, trigger o...