over the two last decades, distribution companies have been aware of the importance of paying attention to the all aspects of a distribution system simultaneously to be successful in the global market. these aspects are the economic, the environmental, the social and the safety aspects. in the vehicle routing problem (vrp) literature, the economic issue has often been used, while the environmen...

A three-level relief chain including a number of suppliers in fixed locations, candidate distribution centers and affected areas at certain points are considered. A mixed integer nonlinear programming model is proposed for open transportation location routing problem by considering split delivery of demand. To solve a realistic problem, foregoing parameters are considered as fuzzy in our propos...

This paper addresses a real-life public patient transportation problem derived from the Hong Kong Hospital Authority (HKHA), which provides ambulance transportation services for disabled and elderly patients from one location to another. We model the problem as a multi-trip dial-a-ride problem (MTDARP), which requires designing several routes for each ambulance. A route is a sequence of locatio...

In this work, a Rich Vehicle Routing Problem (RVRP) is faced for solving city logistic problems. particular, we deal with the problem of company that has to define best distribution strategy obtaining an efficient usage vehicles and reducing transportation costs while serving customers different priority demands during given planning horizon. Thus, multi-period vehicle routing heterogeneous fle...

This paper aims to compare a two-echelon and a single-echelon distribution system. A mathematical model for the Single-Echelon Capacitated Vehicle Routing Problem (SE-CVRP) is proposed. This SE-CVRP is the counterpart of Two-Echelon Capacitated Vehicle Routing Problem (2E-CVRP) introduced in the authors’ previous work. The proposed mathematical model is Mixed-Integer Non-Linear Programming (MIN...

The purpose of this research is to present a new mathematical modeling for a vehicle routing problem considering concurrently the criteria such as distance, weight, traffic considerations, time window limitation, and heterogeneous vehicles in the reverse logistics network for collection of expired products. In addition, we aim to present an efficient solution approach according to differential ...

T his short report describes the background and development of the new emergency care practitioner (ECP) programme run by the East Anglian Ambulance NHS Trust (EAAT) and the Health Schools of the University of East Anglia (UEA). The programme encompasses the emerging national competencies for the ECP. Although the first pilot cohort of 10 paramedics has yet to complete the course at the time of...

nowadays network-on-chips is used instead of system-on-chips for better performance. this paper presents a new algorithm to find a shorter path, and shows that genetic algorithm is a potential technique for solving routing problem for mesh topology in on-chip-network.

OBJECTIVE To determine whether availability of the Cornwall Helicopter Ambulance enabled the ambulance service to arrive more rapidly at the scene of emergencies. DESIGN Retrospectively collected ambulance service data analyzed longitudinally. SETTING The ambulance service in Cornwall. SUBJECTS Patients carried as emergencies by the ambulance service. VARIABLE STUDIED: Augmentation of a c...