Fleet management systems Research Papers (original) (raw)

Now in the world, the exchange of information between vehicles in the roads without any fixed infrastructure is enabled thanks to the novel technology of the Vehicular ad hoc networks called (VANETs). The accidents and congestions... more

Now in the world, the exchange of information between vehicles in the roads without any fixed
infrastructure is enabled thanks to the novel technology of the Vehicular ad hoc networks called (VANETs).
The accidents and congestions warning, Internet access e.g. via gateways along the road are the main
applications of these networks related to the safety and comfort applications. A high requirement on the
routing protocols is introduced in these complexed VANETs networks
In order to implement a reference intelligent transportation system and contribute to the standardization of
vehicle to vehicle communication or vehicle to infrastructure, in Europe, several projects are held and
different partners are joined from the industry, governmental agencies and academia.
This paper explains the main progress and purposes of the standardization process and research initiatives
of FleetNet project. These solutions will present in the future a common worldwide VANET platform
integrating several services of inter-vehicles communications.

Logistics costs control has always been considered a key issue for business development. In order to decrease transportation costs, companies are pushed to negotiate lower logistic service prices with Third-Party Logistics Service... more

Logistics costs control has always been considered a key issue for business development. In order to decrease transportation costs, companies are pushed to negotiate lower logistic service prices with Third-Party Logistics Service Providers (3PL) which, in turn, should be able to optimize their processes and reduce their costs in order to preserve the adequate profitability and allow their industrial customers to gain competitive advantage. In this paper a method to reduce industrial costs and negative externalities associated with fleet management on an Hub & Spoke transportation network is presented. We state that the Time Dependent VRP with Pick-up and Deliveries and Time Windows model may be the most suitable for goods distribution problem inside large cities. A dynamic version capable to consider road traffic along with variable congestion effects during the day has been created. Hence, we proposed a quick and flexible heuristic that has been validated with the real data of a subsidiary of a 3PL leader in the express transportation sector. The heuristic has demonstrated to be able to reduce travel time, travelled distance and, at the same time, significantly increase the service level, on top of the relative benefit for the community coming from a substantial reduction of air pollution, noise pollution, congestion and incidentally.

In the match factor, mining activity between the haulers and loader equipment dramatically affects each fleet's production. The purpose of this study is to simulate the sufficient number of transportation uses as an effort to achieve... more

In the match factor, mining activity between the haulers and loader equipment dramatically affects each fleet's production. The purpose of this study is to simulate the sufficient number of transportation uses as an effort to achieve production targets using queuing theory. The research methods are quantitative and descriptive by analyzing the compatibility value of fleet, fleet production capability, queue number, and queue time. The data required is the time of the distribution, the distance from the mining front to the ROM, and the company's speed limit. The results of this research are beneficial to users of the transporter simulation to be applied based on the theory of the queue is six transport units in the Anggrek pit with a compatibility value of 1.01, five transport units in the Dahlia pit with compatibility value 0.98, and five units of transport in the pit Anggrek with compatibility value 1.04. The haulers' recommendations were made by allocating two haulers ...

ehicle Breakdown is the situation where by the component or system of the Machine fail to return to its normal operation which may led to shutdown of the machine, Failure of the component or system of the Vehicle may lead to breakdown... more

ehicle Breakdown is the situation where by the component or system of the Machine fail to return
to its normal operation which may led to shutdown of the machine, Failure of the component or
system of the Vehicle may lead to breakdown which reduce Availability of the trucks, increase in
maintenance cost caused by improper Preventive maintenance (PM). No single maintenance
program can apply to all operations. Some of the variables that must be factored into the program
are the age and type of equipment, percentage of units under warranty, distances travelled per year,
and how often the unit returns home for service (some long-haul units may be away from home
base for a month or

In spite of the important role transport play in any urban area, transport services are frequently insufficient to meet commuters demand with the services provided suffering from low output. This study assesses the quality of intra urban... more

In spite of the important role transport play in any urban area, transport services are frequently insufficient to meet commuters demand with the services provided suffering from low output. This study assesses the quality of intra urban bus services in Kaduna metropolis as perceived by bus commuters. This study relied on systematic sampling of eight major terminals from which 357 bus commuters were purposively interviewed. Descriptive and inferential statistical techniques were used to summarise the data collected. The study revealed that majority of the commuters (70.3%) walk between 1-500 metres to reach bus stops and 66.9% waited between 1-20 minutes before the arrival of bus. A cross tabulation between the age by walking distance of bus passengers shows a clear difference in the walking distance of passengers to bus stops by age distribution. Also the study revealed that there is a strong relationship between the level of education and the problems encountered by commuters (r = 0.70 and Kendall's Tau = 0.744). Similarly, Phi value = 0.72 and Cramer v = 0.51 indicate a strong relationship between the bus passenger capacity and the problems passengers encountered. Most passengers are not satisfied with the level of bus services provided. The study therefore recommends that certain policy actions such as the use of conventional buses, bus priority measures among others need to be taken in order to improve the quality of intra-urban bus services in Kaduna metropolis.

Kansanshi Mine is one of the largest copper mines in Africa, and on the world scale, it is the eighth largest. The mine produces on average 340,000 tonnes of copper and over 3401.94 kilograms of gold per year. To achieve this, the mine... more

Kansanshi Mine is one of the largest copper mines in Africa, and on the world scale, it is the eighth largest. The mine produces on average 340,000 tonnes of copper and over 3401.94 kilograms of gold per year. To achieve this, the mine operates a large fleet consisting of over 80 dump trucks and more than 22 shovels that are used for its daily load and haul production operation. This operation is monitored, controlled and reported by Modular Mining’s DISPATCH system along with other communication support technical systems.
One of the challenges faced by Kansanshi is mine growth- the mine embarked on an expansion program to increase production capacity by 60%, the expansion of the general topography requires the mine to have an increase in the number of trucks and excavators and other support equipment and hence a demand for an effective and reliable modular fleet management system. Other challenges are ageing of both the Modular dispatch system and Kansanshi’s fleet

The study sought to explore the impact of fleet management on logistics management in the retail sector of Zimbabwe. The study was guided by the objectives that included to determine the impact of fleet management on inventory control, to... more

The study sought to explore the impact of fleet management on logistics management in the retail sector of Zimbabwe. The study was guided by the objectives that included to determine the impact of fleet management on inventory control, to assess the impact of fleet management on material handling and to ascertain the impact of fleet management on distribution communication. The study adopted pragmatism research philosophy and the correlational research design. The study population comprised 40 participants that were drawn from selected retails in Zimbabwe. A total of 30 questionnaires were successfully returned to yield a 75% overall response rate. Findings deduced from the study proved that a positive correlation existed between fleet management and logistics management. Conclusions and recommendations that for the retail sector of Zimbabwe to succeed requires to have constant change and upgrade on their fleet, master distribution routes and adopt innovation in managing the fleet.

This chapter focuses on the implications of the international tourists’ travel patterns in New Zealand to the fleet management of rental car companies. New Zealand is marketed internationally as a touring destination and most trips are... more

This chapter focuses on the implications of the international tourists’ travel patterns in New Zealand to the fleet management of rental car companies. New Zealand is marketed internationally as a touring destination and most trips are multi-destination (Pearce, 2001). The country’s geography, narrow and long comprised of two islands, with the location of the main international gateways, Auckland and Christchurch on each island, means that international tourists tend to engage in circuit travel. They usually enter and leave through the same gateway or arrive in Auckland (in the top of the North Island) and depart from Christchurch (in the middle of the South Island) or vice-versa. Auckland is still the gateway for more than half of international visitor arrivals (Warren and Taylor, 2003) and, because of this, tourist flow is usually Southbound, even though some travelers also fly back to Auckland in order to leave the country. The methodology used in this chapter includes secondary data available online from the New Zealand Ministry of Tourism research website and primary data collected from semi-structured interviews with managers and staff from key rental car companies located in the major cities of the country.

A new short-term mine production scheduling formulation is developed herein based on stochastic integer programming. Unlike past approaches, the formulation simultaneously optimizes fleet and mining considerations, production extraction... more

A new short-term mine production scheduling formulation is developed herein based on stochastic integer programming. Unlike past approaches, the formulation simultaneously optimizes fleet and mining considerations, production extraction sequence and production constraints, while accounting for uncertainty in both orebody metal quantity and quality along with fleet parameters and equipment availability , all leading to a well-informed sequence of mining that is expected to have realistic as well as high performance during a mine's operation. To assess the latter performance and implementation intricacies of the proposed formulation, the formulation is applied at a multi-element iron mine and the resulting monthly schedules are assessed and compared to the conventional mine scheduling approach showing: lower cost, minable patterns, efficient fleet allocation ensuring higher and less variable utilization of the fleet.

Over the years, truck-shovel operation is established as the primary hauling method used in open pit mines. Since the haulage cost can be as high as 50 percent of the total operating cost in a particular mine, numerous studies addressed... more

Over the years, truck-shovel operation is established as the primary hauling method used in open pit mines. Since the haulage cost can be as high as 50 percent of the total operating cost in a particular mine, numerous studies addressed optimization of truck-shovel operations. Different fleet management systems have also been used at many open pit mines to increase the productivity and hence reduce the overall cost. Although these management systems help optimizing the truck assignments, the impact of the truck operator behavior on the overall machine availability has always been difficult to quantify. With the introduction of autonomous trucks into the mining industry in last decade, the effect of truck operator on machine availability has been a very critical information to compare manned vs autonomous trucks. The misuse of brakes during hauling will cause the trucks to be late for their assignments. It will cause extra time loss and fuel loss, which are very critical cost items for any mine. Using brakes unnecessarily will also cause more maintenance time and this will reduce the truck availability. Bad road designs, such as unnecessary stop signs at the intersections, can be another factor of unnecessary time loses. This paper presents a data mining methodology to model the cost of full-stops as opposed to deliberate gradual slow-downs, which is feasible with autonomous trucks. The model uses real machine health and fleet management data to determine the effect of truck stoppings versus slow-downs at intersections or among the haul road.

Short-term production scheduling in open pit mining consists of defining the extraction sequence and process allocation of mineralised material over timescales of either months, weeks, or days. An effective short-term production schedule... more

Short-term production scheduling in open pit mining consists of defining the extraction sequence and process allocation of mineralised material over timescales of either months, weeks, or days. An effective short-term production schedule ensures compliance with the production targets and restrictions imposed by the long-term plan. The method proposed herein outlines a new approach to simultaneously optimise the short-term production sequence with the mobile equipment allocation plan while incorporating both material grade and equipment performance uncertainty. A new simulation methodology is introduced to generate more realistic equipment performance scenarios, as well as a new concept of including ramp positions in the formulation to efficiently facilitate minable extraction patterns. This short-term model is bench-marked against a conventional design at one of the largest copper mines in the world, and the results show improved production target compliance by delivering more consistent ore quantity and quality to each processing destination, and a physical extraction sequence that has a greater likelihood of being realised in the face of equipment performance and truck cycle time uncertainty. ARTICLE HISTORY

Paper deals with the specific LBS scenario – Fleet management (FM) and more specifically with systems for Automatic vehicle location (AVL). Well designed and implemented spatial data model for moving objects is one of the most significant... more

Paper deals with the specific LBS scenario – Fleet management (FM) and more specifically with systems for Automatic vehicle location (AVL). Well designed and implemented spatial data model for moving objects is one of the most significant elements of any AVL system. In practical applications the results of the latest scientific research are seldom applied, despite the fact that this area has been developing intensively for more than 20 years. The reasons for this are analysed in the paper. Short analysis of functionality of these systems is presented considering the impact of these functionalities on the implemented data model for moving objects and more specifically their impact on spatio-temporal component of the model. The paper especially reviews the possibility of using road networks as a basis for the representation of moving objects data models and a fact that these models are rarely used in practical applications. A solution overcoming this situation is proposed. The solution assumes transition from the system that is not based on road network to the system that is based on network. There are quite few research papers dealing with OSM data models. Therefore, a significant space in this paper is dedicated to the description of these models since OSM data can be valuable for this type of applications.

The present study provides firstly a comprehensive review of studies on measuring the impacts of different biodiesel blends on exhaust emissions characteristics of urban busses under real-world operating conditions. Secondly, this paper... more

The present study provides firstly a comprehensive review of studies on measuring the impacts of different biodiesel blends on exhaust emissions characteristics of urban busses under real-world operating conditions. Secondly, this paper discusses the errors that can be made in conducting case studies. Thirdly and finally, it shows lessons learned and provides guidelines to setup case studies, conduct the measurements, perform the statistical analysis and report the results to policy makers and the wider audience. To achieve climate change mitigation targets, using alternative fuels, e.g., biodiesel, hydrogen or electricty (EVs) for the urban fleets requires an in-depth analysis of the impacts under real-world operating conditions. Such experiments are generally very complex as numerous factors could directly or indirectly interfere with the results produced and potentially jeopardize the integrity of the research and the conclusions drawn. Results of the present research show that some vital parameters were ignored by many of the studies performed including the statistical uncertainties, driving cycle uncertainties and fuel uncertainties. Lack of appropriate experimental designs or clear assertions about the level of significance for differences in emissions/fuel consumption between alternative fuels (i.e. biodiesel) and the reference fuel used (i.e., diesel) could be regarded as the main weaknesses. Moreover, many other overarching and very influential factors (e.g., covariates/confounders) can interfere with the research outcomes as these were mostly overlooked by the reviewed studies. A careful and complete experimental design for assessments of alternative fueled vehicles (are critical when conducting real-world operating condition tests. The study findings help to formulate the guidelines for assessing real-world operating condition experiments to achieve the most feasibly and meaningful research outcomes that will have significant implication for local and global policy makers. The guidelines are of use for all types of research studies that want to evaluate the effects of alternative fuels for any transportation fleet.

In the air transport industry,decisions are made based onperceptionsandpredictions. Airlines order aircraftswhen they believe the conditions to upgrade their fleet are appropriate in terms of profitability and market opportunities.... more

In the air transport industry,decisions are made based onperceptionsandpredictions. Airlines order aircraftswhen they believe the conditions to upgrade their fleet are appropriate in terms of profitability and market opportunities. However, the financial performance of an airline can be easily affected by several variables. Many types of delays are decisive in the income and expense structure of the organization. Fleet renewal, for instance, is a very lengthy process, since deliveries usually take five years from the date the order is placed. This paper uses System Dynamics to evaluate the performance of different strategies concerning fleet renewal in a commercial airline, taking into account the complex interdependence between variables and the delays involved in the process. The simulation model is absolutely based on real information retrieved from databases of aviation authorities and actual airlines in Colombia

OBJECTIVE: To study and improve the various safety procedures about the fleet management in BPCL Karur Terminal. METHODOLOGY: Comparison study about the actual standard which is followed in the BPCL Karur Terminal with the government... more

OBJECTIVE:
To study and improve the various safety
procedures about the fleet management in BPCL Karur
Terminal.
METHODOLOGY:
Comparison study about the actual standard
which is followed in the BPCL Karur Terminal with the
government standard regulation. Then the deviations are to
be noted and analyzed. Finally valuable recommendations
are to be given.
RESULT:
The world class standard of FLEET management
amending and increasing in BPCL Karur Terminal.
KEY WORDS- Fleet, BPCL, Safety, Regulation,
Deviations.

The quality of service and efficiency of labour utilization in emergency service fleets, such as police, fire departments, and emergency medical services (EMS), depends, among other things, on the efficiency of work break scheduling. The... more

The quality of service and efficiency of labour utilization in emergency service fleets, such as police, fire departments, and emergency medical services (EMS), depends, among other things, on the efficiency of work break scheduling. The workload of such fleets usually cannot be forecasted with certainty and its urgency requires an immediate response. However, prolonged focused work periods decrease efficiency with related decline of attention and performance. Therefore, break schedule should be regularly updated as the work shift progresses to allow frequent and sufficiently long time for rest. In this paper, we propose a distributed and dynamic work break scheduling algorithm for crews in emergency service vehicle fleets. Based on the historical intervention data, the algorithm rearranges vehicles' crews' work breaks in a manner considering individual crews' preferences. Moreover, it dynamically reallocates stand-by vehicles for best coverage of a region of interest. We analyze the proposed algorithm and show its performance on a simple use-case.

Market for Location Based Services (LBS) has been growing on a daily basis and it has been regarded as one of the most prosperous ones in telecommunication and IT businesses. Among dozens of location based services those dealing with the... more

Market for Location Based Services (LBS) has been growing on a daily basis and it has been regarded as one of the most prosperous ones in telecommunication and IT businesses. Among dozens of location based services those dealing with the fleet management are some of the most common ones. Paper reviews current status of these services and presents estimates related to the future expansion and the development of this business in EU. The data have been taken from studies prepared by relevant organizations dealing with the market surveys. Paper also contains statistical data demonstrating potentials of Serbian market for these services. Data on providers of these services in Serbia are given, as well as estimates on current percentage of vehicles in Serbia being included into LBS fleet management. Experiences gained through the development of typical fleet management service by a Serbian service provider are presented. Current status of infrastructure (telecommunication, Internet, GIS) required for the development of this business has been analyzed. Estimates and expectations related to the impact of further development of certain LBS components (mobile devices, communication network, positioning devices, service providers and applications, data and content providers) on improvement of these services and on the increase of customers in Serbia are also given in the paper.

... system development are given in Table 1. System is used as standalone system, but due to its open architecture, it is easy to integrate it with some business information system ... IN GEODESY AND RELATED FIELDS″ 24-26, June 2011,... more

... system development are given in Table 1. System is used as standalone system, but due to its open architecture, it is easy to integrate it with some business information system ... IN GEODESY AND RELATED FIELDS″ 24-26, June 2011, Kladovo - ,,Djerdap“ upon Danube, Serbia ...

Information and communication technologies (ICT) became an unavoidable factor in optimization of transport processes. In that way, positioning the vehicle represents an essential element for transport companies in their intention to... more

Information and communication technologies (ICT) became an unavoidable factor in optimization of transport processes. In that way, positioning the vehicle represents an essential element for transport companies in their intention to improve the fleet management. There are various technologies applicable for this purpose, but the one discussed in this paper and given as possible solution is using a new telecommunication arhitecture based on Internet Multimedia Subsystem (IMS). This solution is represented in a form of Server based IMS application whose execution is achieved fleet managment control by transport companies. To enable this kind of control it is necessary to perform tracking vehicle position or define a route of movement. IMS as a platform that alows provisioning a new generation telecommunication services also gives a posibility to use the existing infrastructure of mobile networks (GSM, UMTS) for this purpose. Application based on this system allows its users to access the prefered information at any earths location and time either, receives an alarm in a form of SMS, MMS, e-mail and being informed about the possible diversion of the pre-set route. To locate the vehicle, here is used appropriate algorithm based on standard data base and data inputs related on the position of the vehicle in regard to the base station mobile networks and any kind of standard maps, Google or similar.

Financial losses recorded in city bus companies often force managers to implement restructuring strategies aimed at improving business results. However, such decisions may not produce the expected consequences for a number of reasons.... more

Financial losses recorded in city bus companies often force managers to implement restructuring strategies aimed at improving business results. However, such decisions may not produce the expected consequences for a number of reasons. Both the internal and external environment in which such companies operate can make the design and implementation of long-term sustainable policies quite difficult. In fact, the result may be that decision makers introduce “effective” policies in a company subsystem, while ignoring the medium- and long-term implications of such decisions in the performance of the whole company. With the aim to detect the main causes underlying “myopic” fleet maintenance policies, an empirical analysis of two major Italian city bus companies has been conducted. This approach allowed the authors to make explicit the network of cause-and-effect relationships between different business subsystems and to build a system dynamics model to support city bus managers in designing and assessing alternative long-term sustainable strategies. Copyright © 2010 John Wiley & Sons, Ltd.

ABSTRACT The Union of Mediterranean Trading Shipowners of Greece with the technical assistance of ICEPRONAV of Romania have developed a generic ship type that can be constructed in such ways to serve the needs of a wide spectrum of... more

ABSTRACT
The Union of Mediterranean Trading Shipowners of Greece with the technical assistance of ICEPRONAV of Romania have developed a generic ship type that can be constructed in such ways to serve the needs of a wide spectrum of transportation requirements, while ensuring significant economies for the builder in series. The need for this exercise has arisen in the context of ESYAN where clustering of various ship types around the six thousand tons mark had to be taken advantage of in a way to generate scale economies for both, the owners and the builders. While no serious technical innovation is involved, this type of application is novel and offers measurable savings in identifiable areas of the construction. If the matter of the replacement of the Greek Short Sea Fleet is seen as part of the overall strategy of Greece in the post cabotage era of the EU, a large number of such vessels are expected to be built. This paper describes

This work introduces the Fleet-size and Mix Pollution Location-Inventory-Routing Problem with Just-in-Time replenishment policy and Capacity Planning. This problem extends the strategic-level decisions of classic LIRP by considering... more

This work introduces the Fleet-size and Mix Pollution Location-Inventory-Routing Problem with Just-in-Time replenishment policy and Capacity Planning. This problem extends the strategic-level decisions of classic LIRP by considering capacity selection decisions and heterogeneous fleet composition. An MIP formulation of this new complex combinatorial optimization problem is proposed and small-sized problem instances are solved using the CPLEX solver. For the solution of more realistic-sized problem instances, a General Variable Neighborhood Search (GVNS)-based framework is adopted. Novel adaptive shaking methods are proposed as intelligent components of the developed GVNS algorithms to further improve their performance. To evaluate the proposed GVNS schemes, several problem instances are randomly generated by following specific instructions from the literature and adopting real vehicles' parameters. Comparisons between these solutions and the corresponding ones achieved by CPLEX are made. The computational results indicate the efficiency of the proposed GVNS-based algorithms, with the best GVNS scheme to produce 7% better solutions than CPLEX for small problems. Finally, the economic and environmental impacts of using either homogeneous or heterogeneous fleet of vehicles are examined.

On the basis of recent research the article discusses the last years of the Spanish imperial transport system to the Indies sending year by year two fleets to each one of the viceroyaltas and its consequences in transatlantic... more

On the basis of recent research the article discusses the last years of the Spanish imperial transport system to the Indies sending year by year two fleets to each one of the viceroyaltas and its consequences in transatlantic communications as new informations on smuggling, even by high authorities, the increased power and earnings of the viceroys, disposing of much more Moneys than European kings combined with the poor results of the defensive Systems and the "flota de Barlovento", projects of reform

MobTrack:24 is a location based service that belongs to LBS applications for the tracking and management of fleet of vehicles. The design and the development of the first system version were done in 2008 and 2009. The system has been in... more

MobTrack:24 is a location based service that belongs to LBS applications for the tracking and management of fleet of vehicles. The design and the development of the first system version were done in 2008 and 2009. The system has been in commercial use since august 2008. During the last few years it has been established as one of the few leading services of this type in Serbia. The development of this system is a typical example of using the latest concepts and the best practices in the software development for this type of applications. Paper contains detailed description of the system and experiences gained during its development. Major problems and solutions are identified and described. Multi-tier architecture of the system is presented, as well as all the major software components and LBS components used. Software platform used for the development is described in detail with special attention paid to the components providing GIS functionalities of the system. Web services enabling system interoperability and integration with business and other information systems are covered too. Experiences gained during the system implementation and maintenance are also given in the paper.

The purpose of this study is to use the OCTAVE allegro methodology to identify risks in fleet management system (FMS), determine prioritized risks to be mitigated, provide mitigation recommendations for these prioritized risks, and shows... more

The purpose of this study is to use the OCTAVE allegro methodology to identify risks in fleet management system (FMS), determine prioritized risks to be mitigated, provide mitigation recommendations for these prioritized risks, and shows how effective the recommendation is. The result of this study is expected to become an input for FMS service provider of possible risks in FMS services, and risk mitigation approaches that can be used to handle those risks. This risk assessment has successfully identified 6 critical information assets, 10 risks in total, and 4 risks that need to be mitigated, followed by proposed mitigation approaches for those risks. Some of the recommendation has been applied by the company and contribute to SLA achievement of the system. The result also showed that application and simulation software provide most prominent risks in FMS service, thus securing these two will eliminate most risk in FMS service.

This article presents a novel stochastic optimization model that simultaneously optimizes the short-term extraction sequence, shovel relocation, scheduling of a heterogeneous hauling fleet, and downstream allocation of extracted materials... more

This article presents a novel stochastic optimization model that simultaneously optimizes the short-term extraction sequence, shovel relocation, scheduling of a heterogeneous hauling fleet, and downstream allocation of extracted materials in open-pit mining complexes. The proposed stochastic optimization formulation considers geological uncertainty in addition to uncertainty related to equipment performances and truck cycle times. The method is applied at a real-world mining complex, stressing the benefits of optimizing the short-term production schedule and fleet management simultaneously. Compared to a conventional two-step approach, where the production schedule is optimized first before optimizing the allocation of the mining fleet, the costs generated by shovel movements are reduced by 56% and lost production due to shovel relocation is cut by 54%. Furthermore, the required number of trucks shows a more balanced profile, reducing total truck operational costs by 3.1% over an annual planning horizon, as well as the required haulage capacity in the most haulage-intense periods by 25%. A metaheuristic solution method is utilized to solve the large optimization problem in a reasonable timespan.

This paper presents a realtime, collision-free motion coordination and navigation system for an Unmanned Aerial Vehicle (UAV) fleet. The proposed system uses geographical locations of the UAVs and of the successfully detected, static and... more

This paper presents a realtime, collision-free motion coordination and navigation system for an Unmanned Aerial Vehicle (UAV) fleet. The proposed system uses geographical locations of the UAVs and of the successfully detected, static and moving obstacles to predict and avoid: (1) UAV-to-UAV collisions, (2) UAV-to-static-obstacle collisions, and (3) UAV-to-moving-obstacle collisions. Our collision prediction approach leverages efficient runtime monitoring and Complex Event Processing (CEP) to make timely predictions. A distinctive feature of the proposed system is its ability to foresee a risk of a collision in realtime and proactively find best ways to avoid the predicted collisions in order to ensure safety of the entire fleet. We also present a simulation-based implementation of the proposed system along with an experimental evaluation involving a series of experiments. The results demonstrate that the proposed system successfully predicts and avoids all three kinds of collisions in realtime. Moreover, it generates efficient UAV routes, has an excellent runtime performance, efficiently scales to large-sized problem instances involving dozens of UAVs and obstacles, and is suitable for some densely populated, cluttered flying zones.

Questo white paper nasce dall’esperienza sul campo che abbiamo maturato con un progetto di Business Intelligence per un’interessante realtà emergente del mercato italiano del Rent-a-Car. Il progetto ha previsto circa un anno di intenso... more

Questo white paper nasce dall’esperienza sul campo che abbiamo maturato con un progetto di Business Intelligence per un’interessante realtà emergente del mercato italiano del Rent-a-Car. Il progetto ha previsto circa un anno di intenso lavoro di
implementazione e customizzazione di una soluzione di BI gestita con piattaforma Pentaho Enterprise. Nello specifico sono stati prodotti 7 Datamart in una logica integrata di Datawharehousing con il software gestionale in uso presso l’azienda.

This paper addresses the problem of designing a depannage service network for freight transportation fleets in order to fill up an evident gap in Operations Management literature. As a matter of fact, breakdowns have a significant impact... more

This paper addresses the problem of designing a depannage service network for freight transportation fleets in order to fill up an evident gap in Operations Management literature. As a matter of fact, breakdowns have a significant impact on service level and an efficient and effective assistance service is needed in order to guarantee competitive advantage. Aiming at laying the foundations for further research on modelling and solving the considered problem, a literature review is performed for identifying analogies with other problems, already approached in the past, and stating the problem. Finally, parameters, decision variables and objective function that should be considered for modelling and solving the problem are proposed, trying to stimulate the discussion on a new research theme and, more specifically, on the integration of decisions at strategic, tactical and operational level into a systemic model.