The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Lane change is one of the most principle driving behaviors on structure roads. It frequently happens in daily driving. A key issue in lane change technique is trajectory planning, where a set of trajectories describing possible vehicle motions are generated by applying a parametric function, and by uniformly sampling the end states in configuration space; the trajectories are then examined to find...
Hot air (Montgolfiere) balloons represent a promising vehicle system for possible future exploration of planets and moons with thick atmospheres such as Venus and Titan. To go to a desired location, this vehicle can primarily use the horizontal wind that varies with altitude, with a small help of its own actuation. A main challenge is how to plan such trajectory in a highly nonlinear and time-varying...
For a robot with a circular footprint, obstacles in a map can be inflated by the radius of the footprint, and planning can treat the robot as a point robot. Many robotic vehicles however have non-circular footprints. When operating in cluttered spaces it therefore becomes important to evaluate the footprint of these robots against a cost map. This evaluation is one of the major computational burdens...
This paper considers the problem of planning the logistics of distributing medication to points of dispensing (PODs), which will give medication to the public. Previous work on a two-stage routing and scheduling approach showed that it can generate solutions with reasonable minimum slack. This paper presents a delivery volume improvement algorithm that can increase the minimum slack of a given solution.
This paper presents a set of new methods to improve the accuracy of link travel time estimates. For map matching, signal planning is considered besides normal factors such as distance, direction and the connectivity. For link travel time estimates, virtual floating car is used to assist extracting individual link section travel time. Finally, effectiveness of the method is undertaken by actual data...
In this paper, the ??fuzzy-AI model?? is applied for investment decision of optimum repair of multiple metro vehicles. The model solves this highly uncertain and sophisticated problem both based on its fuzzy analysis and reasoning of existing distressed metro vehicles. The VDSI (vehicle distress state indicator) is used in finding the optimum investment management of repair, which is a fuzzy synthesis...
Searching the unknown or partially known region or acquiring the new information in the map is an important mission for vehicle in the areas of military and civilian use. Planning the lowest-cost path is one of the primary work for searching the environment. This paper develops a planning strategy which could minimize the cost and every corner in the map can be seen on the path based on cell decomposition...
This paper presents an intelligent decision algorithm and an on-board architecture designed to enable an autonomous underwater vehicle (AUV) to carry out a survey mission autonomously. The connotation of global model in decision algorithm is analyzed, including environment information, mission information and Self-states of AUV. The survey mission of multi-objective operation areas in an unsafe zone...
Generalized warehouses denote complex warehousing systems where several kind of resources, automated vehicles, manned vehicles and on-foot storemen have to execute a list of moving orders. This paper discusses the differences between the automated warehouses, which have received a great attention in the literature, and the generalized warehouses, which have an increasing relevance in real world but...
In this paper, a dynamic vehicle routing problem with time windows (DVRPTW) was developed in the context of real-time traffic information. The objective of the problem is to minimize the travel time of the vehicles based on a time-dependent model in which the travel speeds are step functions. In order to calculate the forecasted speed, this model is enriched with an exponential smoothing function...
We are developing onboard planning and execution technologies to provide robust and opportunistic mission operations for a future Titan Aerobot. Aerobot have the potential for collecting a vast amount of high priority science data. However, to be effective, an aerobot must address several challenges including communication constraints, extended periods without contact with Earth, uncerttain and changing...
The inventory routing problem (IRP) deals with the coordination of inventory replenishment and transportation. The IRP refers to the situation where the inventory replenishment at a number of locations is controlled by a central manager with a fleet of vehicles. A distribution strategy is necessary for achieving the minimization of distribution cost while satisfying the demands of the retailers are...
This paper describes a general framework for the study of multiple vehicle, time-coordinated path following (TC-PF) control problems. An example is the situation where a group of vehicles is tasked to maneuver and arrive at pre-assigned final positions at the same time in a collision-free manner, while reducing some optimality criterion. The time of arrival is not fixed a priori, and the vehicles...
Path planning is basis for any autonomous underwater vehicle to implement completely cruising in subsea environment and path tracking is important technology as well, especially for multi-AUV (Autonomous underwater vehicle) cruising with a fleet formate. In this paper, algorithms path planning and path tracking are addressed for an open frame AUV. Fast Marching algorithm is applied to solve problems...
State of the art on the system structure of UCAV(s) mission planning in the domestic and abroad is summarized. Meanwhile, the key and urgently-resolved problems are pointed out. The modularized system structure based on the multi-agent techniques is proposed, and each of the relevant agents is defined from the practical point of view. The system structure designed in this paper can not only carry...
The design of a hierarchical planning system in which each level operates in parallel and communicates asynchronously is presented. It is shown that this parallel hierarchical replanner is both reactive, and as close to optimal over all information in the state space as is possible given finite computational power. A comparison with three other hierarchical methods is presented, which demonstrates...
This paper addresses the problem of communication range limitations for decentralized multi-vehicle mapping. We present a novel integrated communication and planning protocol that enables all vehicles to form a common global map. The fusion of mapping information is facilitated through the Information Filter and performed over a connected acyclic wireless communication network with limited communication...
Today, due to the current state-of-the-art of embedded systems, underwater robotic vehicles are limited in both, their autonomy and capabilities. In order to increase their utility it is advantageous to run multiple vehicles at the same time whereby each vehicle serves as individual node in an underwater network. In this context a group of leading European vehicle manufacturers and researchers set...
Engineering services in the framework of an service-oriented architecture (SOA) is complex and open to mistakes if a rigorous approach is not taken. Combining SOA with features to support dynamic service discovery, management and binding, increase the chances that an architecture configuration has been incorrectly specified. To facilitate service engineers designing and implementing service systems...
Traffic congestion has become a major problem in many countries. One of the main causes is the failure to manage a journey. Vehicles tend to choose the shortest paths which ended up congesting a certain area. If a journey is well managed, using alternative paths may lead to the same destination in a shorter period of time. Therefore, with the importance of sustainable environment, intelligent route...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.