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检索条件"主题词=Dijkstra algorithm"

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A time slot assignment algorithm for a TDMA packet radio network.

A time slot assignment algorithm for a TDMA packet radio net...

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作者： William Karl Tritchler United States Naval Postgraduate School

学位级别：硕士

An algorithm for the assignment of time slots within a Time Division Multiple Access (TDMA) scheme for an integrated voice and data packet radio network is implemented in, and studied by, a computer simulation. The slot assignment scheme is applied both to a static network, where "best path" routes are held constant, and also to a network where the "best path" routes are permitted to change d/namically during the simulation as communications capability at various nodes approaches saturation. The dijkstra algorithm is used to determine and modify "shortest distance" routes, and the sensitivity of performance to various parameters used in defining the link "distance function" is investigated. The major conclusion is that it is possible to route in a way that reduces the average energy transmitted per message without substantially decreasing the network throughput.

关键词： Packet Switching Packet Radios TDMA CDMA Communications Networks Integrated Voice and Data Communications Spread Spectrum Signalling dijkstra algorithm

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algorithms to Find Shortest Paths with Added Constraint on Travel Fuel Consumption for Transportation Networks

Algorithms to Find Shortest Paths with Added Constraint on T...

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American-Society-of-Civil-Engineers (ASCE) International Conference on Transportation and Development (ICTD)

作者： Nezafat, Reza Vatani Nguyen, Duc T. Cetin, Mecit Old Dominion Univ CEE Dept 132B KH5215 Hampton Blvd Norfolk VA 23529 USA Old Dominion Univ CEE & MSVE Dept 5215 Hampton Blvd Norfolk VA 23529 USA Old Dominion Univ CEE Dept 135 KH5215 Hampton Blvd Norfolk VA 23529 USA

ISBN: (数字)9780784481547

ISBN: (纸本)9780784481547

In this work, the shortest path (SP) dijkstra algorithm is re-visited and modified so that the modified dijkstra algorithm can perform the task of finding the shortest path (SP) with an added constraint on fuel consumption, which is assumed to be linearly related to the CO2 emissions. For the SP with added constraint problem, the "traditional, classical" dijkstra algorithm is not suitable, thus 4 different algorithms/strategies are proposed, such as (a) finding the k-th successive SP, (b) the lagrange multipliers, (c) linear integer programming (LIP) formulation, and (d) based on using the genetic algorithm (GA). Several small-scale (academic) networks, as well as real-life (large-scale) networks, are used to study the numerical performance of 4 proposed algorithms. Numerical results have indicated that (using reliability and efficiency as first and second criteria, respectively) LIP, k-th successive SP, GA, and Lagrange multipliers can be ranked as 1st, 2nd, 3rd, and 4th, respectively.

关键词： Shortest Paths (SP) Linear Integer Programming k-th Successive SP Lagrange Multipliers Genetic algorithm dijkstra algorithm

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A General MIMO Detection Scheme and Its Performance-Complexity Tradeoff

A General MIMO Detection Scheme and Its Performance-Complexi...

引用

54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Chang, Ronald Y. Chung, Wei-Ho Acad Sinica Res Ctr Informat Technol Innovat Taipei Taiwan

ISBN: (纸本)9781424492688

A unified tree-search detection scheme based on dijkstra's algorithm is developed for MIMO systems. The proposed framework generalizes the original dijkstra's algorithm by allowing the memory usage, detection complexity, and sorting dynamic associated with the algorithm to be customized. By tuning different parameters, desired performance-complexity tradeoffs are attained and a fixed-complexity version can be produced to facilitate hardware implementation. Simulation results demonstrate that the proposed algorithm shows abilities to achieve highly favorable performance-complexity tradeoffs.

关键词： algorithm design and analysis Complexity theory dijkstra algorithm Heuristic algorithms MIMO MIMO communication MIMO systems Measurement Signal processing algorithms Sorting detection complexity general MIMO detection scheme memory usage performance-complexity tradeoff signal detection sorting dynamic tree searching unified tree-search detection

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Calculation of SCARA Manipulator Optimal Path Subject to Constraints

Calculation of SCARA Manipulator Optimal Path Subject to Con...

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2nd International Congress of Engineering Mechatronics and Automation (CIIMA)

作者： Pillajo, Carlos Univ Politecn Salesiana Dept Control & Automatizac Quito Ecuador

ISBN: (纸本)9781479924707

The proposed general the problem of optimization for motion planning of articulated SCARA robotic structures, whose trajectories are subject to constraints, the stated objective is to obtain a sequence of collision-free positions that connect an initial configuration with end using search strategies based on heuristics working space, for which we use the space of the configurations. In order to evaluate the performance of this algorithm, we generated, simulated different work environments and the subsequent display of the planned collision-free paths, applied to articulated SCARA robot. To corroborate this work later this algorithm is implemented on an FPGA allowing varying some basic features of the robot.

关键词： Optimal Path SCARA Robot dijkstra algorithm

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Node placement optimization under K-Coverage and K-Connectivity constraints in wireless sensor networks

Node placement optimization under K-Coverage and K-Connectiv...

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IEEE Symposium Series on Computational Intelligence (IEEE SSCI)

作者： Nguyen Thi Hanh Huynh Thi Thanh Binh Nguyen Quang Huy Nguyen Van Thanh Banh Thi Quynh Mai Hanoi Univ Sci & Technol Hanoi Vietnam Phuong Dong Univ Hanoi Vietnam

ISBN: (纸本)9781665487689

Many wireless sensor networks (WSNs) need to cover targets in their sensor fields and ensure connectivity and fault tolerance to the base station. This is a challenging task when planning the network deployment. Sensors can help extend lifetime but also need to be well positioned to be effectively used. This paper seeks to design an efficient node localization scheme while meeting the requirements of the target coverage and connectivity in the network. The problem is approached in two phases. The first phase solves the K-Coverage constraint, which is a metric closely related to lifetime, using two novel heuristic methods named KGCA and IKGCA. The second phase ensures the connection to the base station using a modified version of dijkstra algorithm. Experimental results show notable improvements in solution quality and running time for the proposed approaches compared to an existing approach to the problem.

关键词： K-Coverage K-Connectivity dijkstra algorithm heuristic algorithm wireless sensor network

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Fusion for optimal path recovering in cerebral x-ray angiography

Fusion for optimal path recovering in cerebral x-ray angiogr...

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Medical Imaging 2001 Conference

作者： Boldak, C Toumoulin, C Coatrieux, JL Polytech Inst Dept Comp Sci Bialystok Poland

ISBN: (纸本)0819440086

The objective is to extract the most plausible graph of two-dimensional vascular branches (e.g. with respect to some basic vessel features) or, in other words, to find the best pairing of vascular segments forming these branches. The assumption here is that a previous detection has been carried out which provides the vessel centrelines. The method, based on sparse to dense description, has been designed in order to eliminate irrelevant lines and to extract the most important branches. The key feature of the method is the use of data fusion concepts in a simple but efficient way, capable to later integrate possibilistic or fuzzy decisions. It makes use of local fusion decision at each node (vessel forking, crossing or ending), based on intensity, continuity and shape properties. Several criteria have been explored with hierarchically structured features. A global fusion allows multiple optimal paths to be set and further merged in order to derive a final graph. Local and global fusions are applied by traversing the vessel network from the extremities to the root and vice and versa. Segments and branches are defined as objects for any further selection, manipulation and measurements. This method can be used both in pre-operative and intra-operative situations.

关键词： X-ray angiography branch formation data fusion dijkstra algorithm

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Optimal Source Placement in a DC Microgrid Considering Line Losses and Cables Weight

Optimal Source Placement in a DC Microgrid Considering Line ...

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2023 IEEE PES Innovative Smart Grid Technologies Europe, ISGT EUROPE 2023

作者： Boutros, Fouad Doumiati, Moustapha Olivier, Jean-Christophe Mougharbel, Imad Kanaan, Hadi Y. ESEO 10 Bd Jeanneteau Angers49100 France IREENA Lab UR 4642 France Saint-Joseph University of Beirut Lebanon Univ. Nantes 37 Bd de l’Université France IREENA Lab UR 4642 Saint Nazaire44600 France ETS Montréal Laboratoire Grepci Canada Saint-Joseph University of Beirut Lebanon Faculty of Engineering ESIB Lebanon

ISBN: (纸本)9798350396782

This research paper presents a methodology for optimizing the placement of an electric single source in a DC islanded microgrid mesh network with the aim of minimizing line losses while considering minimal cables weight. The paper utilizes the dijkstra algorithm (a graph algorithm used in Google Maps) to identify the shortest path between a potential source node and all other variable loads in a predefined electric distribution mesh network topology. The resulting optimal placement of sources is ordered based on their corresponding line losses and optimal cables weight. Connected nodes in the mesh network are predefined, but lines optimal resistances are computed by the algorithm. The study only considers active power and provides insights into optimizing the placement of sources in DC microgrid mesh networks. The main contribution of this paper is to rank source node positions from least to highest line losses. The paper also provides a comparison of the mesh networks based on the optimal cables weight used when placing a source at a defined position. The proposed methodology can be useful for system designers and operators seeking to minimize line losses and optimize energy distribution in DC microgrids using a mesh network topology. © 2023 IEEE.

关键词： DC microgrid dijkstra algorithm line losses and cables weight optimization mesh network optimal electric single source placement

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A new routing algorithm under shared-risk-link-groups constraints for optical networks

A new routing algorithm under shared-risk-link-groups constr...

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Conference on Asia-Pacific Optical and Wireless Communication (APOC 2002)

作者： Wen, HB Li, LM Sheng, W Univ Elect Sci & Technol China Natl Key Lab Broadband Opt Fiber Transmiss & Comm Chengdu 610054 Peoples R China

ISBN: (纸本)0819446998

This paper investigates the diverse routing in a wavelength division multiplexing (WDM)-based optical network under SRLG-disjoint constraints. In operational optical networks there are a lot of traffic flows within every lightpath. Any failure of one lightpath will lead to a great loss. So we should provide path protection for the working lightpath. The concept of Shared Risk Link Groups (SRLG) is introduced in optical networks by IETF, which is defined as a group of links that share a common risk component whose failure can potentially cause the failure of all the links in the group. This concept groups all of the entities, such as wavelengths and links, etc., that are affected by a single failure. Now when path protection is employed, for any lightpath connection request, we compute two SRLG-disjoint lightpaths, one as working path and the other as protection path. There are some literatures, which propose methods for link-disjoint paths pair or node-disjoint paths pair, but few algorithms for SRLG-disjoint paths pair. The SRLG-disjoint constraints entail the general constraint-based path computation algorithms. Since this problem is an NP-complete problem and there is no algorithm which could be used to solve this path computation in polynomial time. This paper presents a heuristic algorithm, Low-cost Pair of SRLG-Disjoint Paths algorithm (LPSD), to solve this problem. LPSD can compute two SRLG-Disjoint paths simultaneously, and the total cost of the two paths is near optimal. Analysis and simulation are also given out.

关键词： WDM network shared risk link groups (SRLG) K shortest path selection algorithm dijkstra algorithm Low-cost pair of SRLG-Disjoint paths algorithm (LPSD)

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A more realistic approach for electric power distribution networks design that considers existing electric infrastructure and geographic constraints

A more realistic approach for electric power distribution ne...

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2020 IEEE Andescon Conference

作者： Vasquez-Miranda, Paul F. Vasquez-Villarruel, Ramiro M. Escuela Politec Nacl Dept Elect Energy Quito Ecuador Escuela Politec Nacl Dept Elect Energy Ibarra Ecuador

ISBN: (数字)9781728193656

ISBN: (纸本)9781728193656

Due to its considerable impact on the distribution systems' operative efficiency, the technical losses of electric energy are a fundamental parameter to be optimized during the design of the grids. Unfortunately, in practice, this task is generally made without facing the problem as a minimization of the total involved costs. In addition, the proposed methods for coping with this task actually are theoretical. Indeed, they do not consider that the circuit routes in most cases are constrained e.g., by rivers, parks, avenues, streets, sights, etcetera. In this paper, a novel routes-constrained clustering-based methodology is proposed with the aim of determining, without any assessment of operative costs, not only the optimal location of transformers but also the optimal -and feasible- paths for their secondary circuits. With illustrative purposes, a uniform distribution of clients' demand along the study area is assumed. For the sake of going deeper into this research topic, the authors are currently developing an improved version of this methodology, which could be applied to actual Electric Power Distribution Networks (EPDN), by dabbling into the digraphs and evolutionary algorithms application.

关键词： circuits design dijkstra algorithm efficiency electric power distribution k-medoids least-cost routing location of transformers losses optimization

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On shortest paths and sorting

On shortest paths and sorting

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1972 ACM Annual Conference/Annual Meeting, ACM 1972

作者： Johnson, Ellis L. IBM United States

In finding shortest paths, the operation of finding, successively, a minimum from a list of numbers may require more work than the remainder of the algorithm. It is shown how algorithms from sorting literature can be used to accomplish this part of the shortest path algorithm. Bounds on the largest possible amount of work are established, and results of a computational study are reported. © Proceedings of the ACM Annual Conference, ACM 1972. All rights reserved.

关键词： dijkstra algorithm Shortest paths Treesort

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