Two hierarchical location-allocation models are used to locate two types of communitybased health facilities in Davao City, Philippines. Oftentimes, locating health facilities are motivated by factors such as politics and resource availability. Different optimization approaches to locating a mix of these health facilities across the rural and urban areas of the city. Computations results are ev...

In the k-median and facility location problems, we are given two sets: F , the set of facilities and C, the set of clients. There is a specified distance cij ≥ 0 (forming a metric) between every pair i, j ∈ F ∪C. The goal is to identify a subset of facilities S ⊆ F and to serve the clients in C by the facilities in S, such that the cost function is minimized. Formally, the k-median problem is d...

During the last three decades, the integrated optimization approach to logistics systems has become one of the most important aspects of the supply chain optimization. This approach simultaneously considers the interdependence of the location of the facilities, suppliers/customers allocation to the facilities, the structure of transportation routes, and inventory planning and control. Location-...

Research on facility location is abundant. However, this research does not typically address the particular conditions that arise when locating facilities to service large-scale emergencies, such as earthquakes, terrorist attacks, etc. In this work we first survey general facility location problems and identify models used to address common emergency situations, such as house fires and regular ...

Contemporary model query and transformation engines typically provide built-in facilities for retrieving all instances of a particular type/kind regardless of their location in a model (i.e. OCL’s allInstances()). When implemented in a naive manner, such facilities can be computationally expensive for large models. We contribute a novel approach for implementing allInstances()-like facilities f...

Location-Routing Problem (LRP) emerges as one of the hybrid optimization problems in distribution networks in which, total cost of the system would be reduced significantly by simultaneous optimization of locating a set of facilities among candidate locations and routing vehicles. In this paper, a mixed integer linear programming model is presented for a two-echelon location-routing problem wit...

The hub location problem arises in a variety of domains such as transportation and telecommunication systems. In many real-world situations, hub facilities are subject to disruption. This paper deals with the multiple allocation hub location problem in the presence of facilities failure. To model the problem, a two-stage stochastic formulation is developed. In the proposed model, the number of ...

blood supply chain management is one of the mainchallenges in healthcare system. optimal locationof blood donation camps is one of the key factors in optimizing the bloodsupply chain. disruption in location of blood donation camps because ofdisasters will have a negative impact on the entire supply chain. thispaper develops a generalized network optimization model for the complex supplychain of...

The facility location problem is arguably the prototypical problem in the mechanism design without money’s research agenda. Motivated by the intrinsic limitations of the classical model on both (i) adequately modelling several real life scenarios and (ii) admitting truthful mechanisms having good approximation ratio, we introduce and study a novel, more realistic model of facility location, whe...