Hajem A. Daham

• Ph.D. in Operational Research
• Lecturer at Al-Muthanna University

In this paper, we address the vehicle routing problems with backhauls. This type of vehicle routing problem consists of two types of delivery, linehaul and backhaul cases. For the linehaul case, vehicles deliver goods/products from a single depot to receiver customers. In contrast, for the backhaul case, the delivery process starts from the sender...

Given a rectangle [Formula: see text] containing points, we consider the problem of detecting the largest rectangle that is totally contained in [Formula: see text] and does not include any of the points. In other words, we want to find the biggest hole in the dataset that can contain the biggest possible rectangle. A new algorithm for dealing with...

Discrete facility location problems are classified as types of facility location problems, wherein decisions on choosing facilities in specific locations are made to serve the demand points of customers, thus minimizing the total cost. The covering- and median-based problems are the common classified types of discrete facility location problems, wh...

Given a (0, 1) −matrix, the Consecutive Ones Submatrix (C1S) problem which aims to find the permutation of columns that maximizes the number of columns having together only one block of consecutive ones in each row is considered here. A heuristic approach will be suggested to solve the problem. Also, the Consecutive Blocks Minimization (CBM) proble...

Healthcare systems efficiency is a ratio of service delivery system outputs to inputs to achieve optimal strategy for decision makers. In this paper, we investigated the efficiency of Eastern Mediterranean health observatory systems. For this purpose, a data envelopment analysis model formulated to evaluate the efficiency of healthcare systems resp...

Outliers in multivariate data is an intractable problem. In statistics, the Minimum Volume Ellipsoid (MVE) estimator is an essential tool in outlier detection and robust regression. Given a set of points \(C=\{x_{1}, x_{2},..., x_{m}\} \subseteq \,\, R^{n}\). If it required only that at least k of m points, \(k < m\) be enclosed in the minimum volu...

Inland transportation of containers contributes significantly to the total cost of container intermodal transportation. For this reason, it has received a lot of attention in the last few decades. While there are many reports of attempts to solve the problem out there, the variants considered are all simpler than the form addressed in this paper. H...

In reality, the flipped classroom has gained popularity as a modern way of structuring teaching, where lectures move from in-class procedures to digitally-based assignments, freeing up the debate, and practice exercises class time. Therefore, it is essential to implement and analyze a way of teaching that will improve student performance. The paper...

A significant portion of the total cost of the intermodal transportation is generated from the inland transportation of containers. In this paper, we design a mixed integer linear programming (MILP) model for combining orders in the inland, haulage transportation of containers. The pickup and delivery process of both 20 and 40 foot containers from...

The inland transportation takes a significant portion of the total cost that arises from intermodal transportation. In addition, there are many parties (shipping lines, haulage companies, customers) who share this operation as well as many restrictions that increase the complexity of this problem and make it NP-hard. Therefore, it is important to c...