The analytic center cutting plane method (ACCPM) is one of successful methods to solve nondifferentiable optimization problems. In this paper ACCPM is used for the first time in the vehicle routing problem with time windows (VRPTW) to accelerate lagrangian relaxation procedure for the problem. At first the basic cutting plane algorithm and its relationship with column generation method is clari...

What is the true rate of social mobility? Modern one-generation studies suggest considerable regression to the mean for all measures of status – wealth, income, occupation and education across a variety of societies. The β that links status across generations is in the order of 0.2-0.5. In that case inherited surnames will quickly lose any information about social status. Using surnames this pa...

these days, due to growing the e-commerce sites, access to information about items is easier than past. but because of huge amount of information, we need new filtering techniques to find interested information faster and more accurate. therefore recommender systems (rs) introduced for solving this problem. although several recommender approaches have proposed, collaborative filtering (cf) appr...

Given that the majority of communications devices are mobile terminals, efficient mobility support should be a key feature in the new generation network or future Internet. The current Internet does not have native mobility support. Although variants of Mobile IP protocols have been developed to address this problem, these protocols cause signaling overhead, create a single point of failure, an...

this article considers literature with all its literary obligations as a narration of language and analyzes two generations of authors while focusing on the gender variable. in this research two pairs of literary texts within the period of forty years are analyzed using discourse analysis and speech from formalist school of literature, in order to extract the literary and gender features. the a...