The spread of HIV and AIDS and risky sexual behavior continues to be a problem in Sub-Saharan African countries despite government measures to educate people on the risk and severity of the disease and measures to promote safe sex practices such as making condoms readily available at reduced or no cost. We examine whether people decide to engage in risky sexual behavior due to low income and lo...

in this paper, we show that inverse data envelopment analysis (dea) models can be used to estimate output with fuzzy data for a decision making unit (dmu) when some or all inputs are increased and deficiency level of the unit remains unchanged.

although lot streaming scheduling is an active research field, lot streaming flexible flow lines problems have received far less attention than classical flow shops. this paper deals with scheduling jobs in lot streaming flexible flow line problems. the paper mathematically formulates the problem by a mixed integer linear programming model. this model solves small instances to optimality. moreo...

abstract. when a production facility is designed, there are various parameters affecting the number machines such as production capacity and reliability. it is often a tedious task to optimize different objectives simultaneously. the other issue is the uncertainty in many design parameters which makes it difficult to reach a desirable solution. in this paper, we present a new mathematical model...

Black ice is a thin coating of on the road surface, which strongly reduces friction at tire-road resulting in dangerous driving when it happens. An appropriate diagnostic black could prevent traffic accidents as well provide timely notice to drivers. Therefore, this study aims developing prediction model diagnose probability formation. Several combinations that can form have been considered, in...

aim and back ground: impulsivity and risky decision making is a core element of plenty of individual and social deficits. on the other hand, history of attention deficit disorder and hyperactivity has been reported in many people with these problem particularly addiction. decision making requires basic cognition function such as inhibition, working memory and attention. the aim of the current s...

In this paper, the portfolio management problem with stochastic wage income and inflation risk for CRRA investors is solved. real life, experience risk. This could be due to events such as COVID-19, fiscal policy, financial policy adjustments, climate change. We consider an agent who invests in market one risk-free security (e.g. a money account or bond) risky stock index). Our goal choose opti...

abstract— peer-to-peer ( p2p ) systems have been the center of attention in recent years due to their advantage . since each node in such networks can act both as a service provider and as a client , they are subject to different attacks . therefore it is vital to manage confidence for these vulnerable environments in order to eliminate unsafe peers . this paper investigates the use of genetic ...