Due to drops in orders and decreasing production rates, demand is declining seriously in many logistic sectors like e.g. air cargo, ship and less-than-truckload (LTL) transports. Hence, logistic companies are looking for new ways to improve their transportation network efficiency. On the operational level, costs depend mainly on planned delivery tours. In our current research project KolOptNet1...

This paper presents a 0-1 programming model aimed at obtaining the optimal inventory policy and transportation mode for maintenance spare parts of high-speed trains. To obtain the model parameters for occasionally-replaced spare parts, a demand estimation method based on the maintenance strategies of China's high-speed railway system is proposed. In addition, we analyse the shortage time using ...

Artificial Intelligent (AI) techniques make a great influence on real-world distribution operations due to the complexity and the difficulty of finding an optimal solution within the limited time frame. To bridge the gap between standard problems in distribution and the real world problems, in this research, the standard VRP problem is extended to Multi Depot Vehicle Routing Problem with Time W...

In this study, we present the problem of shipping a single-product from a single supply origin, through storage depots, to a single demand destination by trucks, ships, etc. and aim to minimize the sum of ordering, inventory and transportation costs over an infinite time horizon. We formulate the problem consisting of power-of-two (PoT ), stationary and nested replenishment policies for the mul...

In this paper, a new approach to risk minimizing vehicle routing and scheduling problem is presented. Forwarding agents or companies have two main concerns for the collection of high-risk commodities like cash or valuable commodities between the central depot and the customers: one; because of the high value of the commodities transported, the risk of ambush and robbery are very high. Two; the ...

This study aims to determine public services in the field of Intercity and Interprovincial (AKAP) Bus transportation Terminal Kalideres between 2017-2019, considering that is largest Jakarta with more than 5,000 passengers. large number results still not optimal service functions managed by DKI Provincial Transportation Agency. The research method used a qualitative approach find out about invo...

We introduce the Synchronized Multi-Assignment Orienteering Problem (SMOP), a vehicle routing problem that requires jointly selecting set of jobs while synchronizing assignment and transportation agents to roles form ad-hoc teams at different job locations. Agents must be assigned only for which they are qualified. Each certain number in each role within time window contributes reward score if ...

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...

The vehicle routing problem with simultaneous pick-up and delivery (VRP_SPD) is a variant of the classical vehicle routing problem (VRP) where clients require simultaneous pick-up and delivery service. Deliveries are supplied from a single depot at the beginning of the vehicle’s service, while pick-up loads are taken to the same depot at the conclusion of the service. One important characterist...