To co-locate or not? : location decisions and logistics concentration areas

Abstract within pdf

Modeling the Impact of Technological Changes on Urban Commercial Trips by Commercial Activity Routing Type

An array of noteworthy developments in logistics practice has taken place without an equivalent and comprehensive development in urban freight transportation modeling. Part of the problem is the lack of deep understanding of the workings of distribution processes in relation to the generation of truck traffic. In this paper it is emphasized the role and importance that distribution network size, and information and communication technology have on the truck traffic flows that materializes as the supply chain that flows over the public infrastructure. This paper develops the concept of commercial activity routing types that characterize the interplay between transportation demand requests and routing characteristics. This research contributes to the field proposing a novel and detailed characterization of truck flows in a supply chain context. Using well-known yet simple models and formulas from vehicle routing, operations research, and management science literature, we derive behavioral insights about distributors and carriers’ routing and order sizing decisions, as routing constraints and second order effects are important drivers of truck flows. The main contribution is to bring a new commercial activity-routing perspective and deeper level of operational decision-making analysis to cope with the intricacies of freight transportation modeling

Simulation and optimization of a multi-agent system on physical internet enabled interconnected urban logistics.

An urban logistics system is composed of multiple agents, e.g., shippers, carriers, and distribution centers, etc., and multi-modal networks. The structure of Physical Internet (PI) transportation network is different from current logistics practices, and simulation can effectively model a series of PI-approach scenarios. In addition to the baseline model, three more scenarios are enacted based on different characteristics: shared trucks, shared hubs, and shared flows with other less-than-truckload shipments passing through the urban area. Five performance measures, i.e., truck distance per container, mean truck time per container, lead time, CO2 emissions, and transport mean fill rate, are included in the proposed procedures using real data in an urban logistics case. The results show that PI enables a significant improvement of urban transportation efficiency and sustainability. Specifically, truck time per container reduces 26 percent from that of the Private Direct scenario. A 42 percent reduction of CO2 emissions is made from the current logistics practice. The fill rate of truckload is increased by almost 33 percent, whereas the relevant longer distance per container and the lead time has been increased by an acceptable range. Next, the dissertation applies an auction mechanism in the PI network. Within the auction-based transportation planning approach, a model is developed to match the requests and the transport services in transport marketplaces and maximize the carriers’ revenue. In such transportation planning under the protocol of PI, it is a critical system design problem for decision makers to understand how various parameters through interactions affect this multi-agent system. This study provides a comprehensive three-layer structure model, i.e. agent-based simulation, auction mechanism, and optimization via simulation. In term of simulation, a multi-agent model simulates a complex PI transportation network in the context of sharing economy. Then, an auction mechanism structure is developed to demonstrate a transport selection scheme. With regard of an optimization via simulation approach and sensitivity analysis, it has been provided with insights on effects of combination of decision variables (i.e. truck number and truck capacity) and parameters settings, where results can be drawn by using a case study in an urban freight transportation network. In the end, conclusions and discussions of the studies have been summarized. Additionally, some relevant areas are required for further elaborate research, e.g., operational research on airport gate assignment problems and the simulation modelling of air cargo transportation networks. Due to the complexity of integration with models, I relegate those for future independent research

Business-to-business marketplaces for freight transportation

Thesis (M.Eng.)--Massachusetts Institute of Technology, Engineering Systems Division, 2000.Includes bibliographical references (leaves 52-54).Business-to-business (B2B) marketplaces bring together buyers and sellers in different industries using the Internet to conduct or facilitate business transactions. Among these new intermediaries or "infomediaries" are several firms that address spot market transactions and long-term contract negotiations for truckload, airfreight, ocean and intermodal shipments. Most of the initial activity in freight transportation has focused on the highly fragmented truckload sector. Currently, none of these firms process enough shipments to constitute critical mass or a self-sustaining business model. Without liquidity, B2B marketplaces that rely solely on an exchange cannot present a viable alternative to existing transportation intermediaries, such as brokers and forwarders, since shippers' orders cannot be frequently matched with carriers' capacity. Channel mix and domain expertise are the critical strategic mobility barriers for B2B marketplaces. Firms must make strategic decisions early about whether to include or exclude existing intermediaries and also how carriers' direct sales forces may be displaced. The service offering must either reinforce or replace the basic functions of intermediaries. Technology leadership in applications critical to shippers (e.g., shipment consolidation, mode selection and combinatorial bidding) is a proxy for domain expertise and will largely determine a company's ability to differentiate its offerings and form a broad versus narrow line. Shippers will receive the greatest benefit from B2B marketplaces and Internet-based transportation management systems present the best opportunity for value creation. This research examines indirect channels for freight transportation and the specific functions performed by existing intermediaries. Trading models are categorized and four case studies of truckload marketplaces are presented. Frameworks are provided for channel structure and strategic groupings.by Marc D. Boyle.M.Eng

Under-utilisation of road freight vehicle capacity: A case for eco-efficiency through collaboration

The road haulage sector experiences a considerable amount of inefficiency, characterised by sub-optimal utilisation of an individual vehicle’s cubic load fill and weight hauling capacity. This study firstly aims to understand why – despite its evident economic and environmental cost – this phenomenon has existed over the years. Next, an overview of initiatives and opportunities for improving freight vehicle capacity utilisation will be given. This paper by no means attempts to suggest that part-loaded or empty trucking can be fully eliminated. What is argued however is that there is theoretical scope for reducing the socio-environmental externalities of these activities while sustaining – if not increasing – the benefits that road haulage offers to the economy. Alongside direct mitigation of energy efficiency (by vehicle technology and/or modal shifts), maximizing existing vehicle capacity utilization must also form an integral part of efforts to green modern road freight logistics.It is suggested that horizontal collaboration and multi-actor co-loading of freight vehicles holds the greatest potential for improving vehicle fill rates. This requires little capital investment and would mean that the same degree of utility is delivered with fewer individual vehicles on the road. However, it is also argued that a collaborative road freight model may come in conflict with modern customer demands and production patterns, which typically involve rapid just-in-time deliveries of ever smaller consignments. Subsequently the widespread outsourcing of road freight operations to external third-party operators has not resulted in pronounced gains in vehicle capacity utilisation. It appears that a transport operator has very limited ability to better consolidate goods within its vehicles, unless its contractors offer an operational environment where this is possible. This paper suggests that a platform be established that will enable transport purchasers (contractors) to identify synergies in their logistical flows. This should help to move away from one-vehicle-to-one-customer arrangements, and develop an approach where a single moving vehicle’s available capacity is viewed as a service that is available for the benefit of several actors at the same time