To enhance the certainty of the grade block model, it is necessary to increase the number of exploratory drillholes and collect more data from the deposit. The inputs of the process of locating these additional drillholes include the variogram model parameters, locations of the samples taken from the initial drillholes, and the geological block model. The uncertainties of these inputs will lead...

In this work, we obtain the following new results. Given a sequence D = ((h1, s1), (h2, s2) . . . , (hn, sn)) of number pairs, where si > 0 for all i, and a number Lh, we propose an O(n)-time algorithm for finding an index interval [i, j] that maximizes Pj k=i hk Pj k=i sk subject to ∑j k=i hk ≥ Lh. Given a sequence D = ((h1, s1), (h2, s2) . . . , (hn, sn)) of number pairs, where si = 1 for all...

abstract portfolio definition is the most important decision for individuals and legal persons that invest in stock. the main objective of this paper is study and determination of optimal portfolio for stock of active food industrial company in tehran stock based on value at risk (var) index. for this purpose, we used weekly static of stock of active food industrial company in tehran from bahma...

transport infrastructure is an important factorforthe spatialdistribution ofgoods, services andinnovationswithinand between regions, and also an important factorin locating andestablishingbusinessesinthe region. this research aims to analyze the effects of transportation infrustructure on industrial concentration in the iranian provinces. for this aim, we have specified econometrics models and ...

A “plan diagram” is a pictorial enumeration of the execution plan choices of a database query optimizer over the relational selectivity space. We have shown recently that, for industrial-strength database engines, these diagrams are often remarkably complex and dense, with a large number of plans covering the space. However, they can often be reduced to much simpler pictures, featuring signific...

This paper considers the reliable multi-product multi-vehicle multi-type link logistics network design problem (RMLNDP) with system disruptions, which is concerned with facilities locating, transshipment links constructing, and also allocating them to the customers in order to satisfy their demand on minimum expected total cost (including locating costs, link constructing costs, and also expect...