Algorithm Presentation
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Transcript of Algorithm Presentation
1- What is the problem?To find the shortest path in a directed graph.Implementing Dijkstra's algorithm on a time-dependent network, where every node has a different travel time depending on when the traveller enters the edge.
2 – Why is it important?
• Application in the transportation sector
- Which path to choose from a given set of paths?- When to choose a specific path?
Concept could be applied to any network that suffers from time-dependent congestion problem .
4- What are limitations of related work?
• Continuous approach does not prove bounds on the size of the structures created during search.
• Discrete approach does not act simultaneously on space and time.
5- What is the proposed approach?
Input :1. A graph G with a set of nodes ‘V’
and a set of edges ‘E’.2. Travel_time_series associated with
each edge.
Output:Quickest path to reach from start node to destination, for every time_slot.
Algorithm approach:
Step1 : Generate labels for all the nodes connected to the Start node. (i.e. s)
To do this, check the Travel_time_series associated with all edges beginning from the start node.
7 – Validation Design ?
• Implement algorithm and compare wth Dijkstra for all start times.
• Parameters to be considered : Length of time series Desired accuracy Frequency with which travel time changes.
(The two algorithms will be tested for different values of these parameters).