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Maritime piracy: Solving the optimized transit path problem.

机译:海上盗版:解决优化的运输路径问题。

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摘要

Models have been developed that accurately predict the probability of pirate activity at locations throughout the Arabian Sea. With these piracy prediction models, mariners transiting this region can ensure that their course avoids the highest threat regions and that ample anti-piracy precautions are in place elsewhere. However, they are on their own to determine their "best" transit path.;Using unique piracy success predictors and transit cost calculators, along with existing pirate activity predictions, this research develops a method for determining the Optimized Transit Path through the Arabian Sea. This method simultaneously optimizes two different attributes, piracy avoidance and cost minimization, based on a mariner's priorities.;The Optimized Transit Path (OTP) algorithm calculates the minimum cumulative path through a two-dimensional, geographic matrix. The OTP algorithm finds the shortest path through the network from a starting line on one side of the matrix to a finish line on the other side. Using a computer code of the algorithm, experimental tests quantified the OTP algorithm's computation speed and required number of calculations to reach a solution. Further, the performance of the OTP algorithm at solving the piracy matrix was compared to the speed of other shortest path algorithms. Based on this study, the OTP algorithm's speed at solving the piracy matrix was comparable to that of the fastest shortest path algorithm in use today, Dijkstra's Algorithm implementing a Min-Priority queue with a Fibonacci Heap, and significantly faster than all others.;Because it can use the piracy prediction matrix directly as an input, the OTP algorithm is especially well suited for solving the piracy avoidance problem. More importantly, its calculation of Optimized Slack quantifies the additional cost of diverting from the shortest path, information not calculated by other shortest path methods. However, use of the OTP algorithm is fairly limited, as it is only well suited for matrices that represent a flat plane of interconnected geographic areas, with movement from a node limited to the eight adjacent nodes surrounding it.;Another promising application of the methods in this paper is within the field of underwater search.;Models have been developed that accurately predict the probability of pirate activity at locations throughout the Arabian Sea. With these piracy prediction models, mariners transiting this region can ensure that their course avoids the highest threat regions and that ample anti-piracy precautions are in place elsewhere. However, they are on their own to determine their "best" transit path.;Using unique piracy success predictors and transit cost calculators, along with existing pirate activity predictions, this research develops a method for determining the Optimized Transit Path through the Arabian Sea. This method simultaneously optimizes two different attributes, piracy avoidance and cost minimization, based on a mariner's priorities.;The Optimized Transit Path (OTP) algorithm calculates the minimum cumulative path through a two-dimensional, geographic matrix. The OTP algorithm finds the shortest path through the network from a starting line on one side of the matrix to a finish line on the other side. Using a computer code of the algorithm, experimental tests quantified the OTP algorithm's computation speed and required number of calculations to reach a solution. Further, the performance of the OTP algorithm at solving the piracy matrix was compared to the speed of other shortest path algorithms. Based on this study, the OTP algorithm's speed at solving the piracy matrix was comparable to that of the fastest shortest path algorithm in use today, Dijkstra's Algorithm implementing a Min-Priority queue with a Fibonacci Heap, and significantly faster than all others.;Because it can use the piracy prediction matrix directly as an input, the OTP algorithm is especially well suited for solving the piracy avoidance problem. More importantly, its calculation of Optimized Slack quantifies the additional cost of diverting from the shortest path, information not calculated by other shortest path methods. However, use of the OTP algorithm is fairly limited, as it is only well suited for matrices that represent a flat plane of interconnected geographic areas, with movement from a node limited to the eight adjacent nodes surrounding it.;Another promising application of the methods in this paper is within the field of underwater search.
机译:已经开发出可以准确预测整个阿拉伯海各地海盗活动概率的模型。使用这些海盗预测模型,在该地区中转的海员可以确保他们的航行避开威胁最大的区域,并在其他地方采取足够的反海盗预防措施。但是,他们只能靠自己来确定自己的“最佳”过境路径。使用独特的海盗成功预测器和过境成本计算器,以及现有的海盗活动预测,本研究开发了一种确定通过阿拉伯海的最佳过境路径的方法。该方法基于水手的优先级同时优化了两个不同的属性,即避免盗版和成本最小化。;优化过境路径(OTP)算法通过二维地理矩阵计算最小累积路径。 OTP算法找到从矩阵一侧的起点到另一侧的终点的最短路径。使用该算法的计算机代码,实验测试对OTP算法的计算速度和达到解决方案所需的计算数量进行了量化。此外,将OTP算法在求解盗版矩阵时的性能与其他最短路径算法的速度进行了比较。根据这项研究,OTP算法解决盗版矩阵的速度与当今使用的最快最短路径算法的速度相当,Dijkstra的算法实现了带有Fibonacci堆的最小优先级队列,并且比所有其他算法都快得多。它可以直接使用盗版预测矩阵作为输入,因此OTP算法特别适合解决盗版避免问题。更重要的是,它对“优化松弛”的计算量化了从最短路径转移的额外成本,而其他最短路径方法没有计算出这些信息。但是,OTP算法的使用受到相当有限的限制,因为它仅适用于表示互连地理区域的平面的矩阵,并且从一个节点移动到围绕它的八个相邻节点。本文已开发出可以精确预测整个阿拉伯海各地海盗活动概率的模型。使用这些海盗预测模型,在该地区中转的海员可以确保他们的航行避开威胁最大的区域,并在其他地方采取足够的反海盗预防措施。但是,他们只能靠自己来确定自己的“最佳”过境路径。使用独特的海盗成功预测器和过境成本计算器,以及现有的海盗活动预测,本研究开发了一种确定通过阿拉伯海的最佳过境路径的方法。该方法基于水手的优先级同时优化了两个不同的属性,即避免盗版和成本最小化。;优化过境路径(OTP)算法通过二维地理矩阵计算最小累积路径。 OTP算法找到从矩阵一侧的起点到另一侧的终点的最短路径。使用该算法的计算机代码,实验测试对OTP算法的计算速度和达到解决方案所需的计算数量进行了量化。此外,将OTP算法在求解盗版矩阵时的性能与其他最短路径算法的速度进行了比较。根据这项研究,OTP算法解决盗版矩阵的速度与当今使用的最快最短路径算法的速度相当,Dijkstra的算法实现了带有Fibonacci堆的最小优先级队列,并且比所有其他算法都快得多。它可以直接使用盗版预测矩阵作为输入,因此OTP算法特别适合解决盗版避免问题。更重要的是,它对“优化松弛”的计算量化了从最短路径转移的额外成本,而其他最短路径方法没有计算出这些信息。但是,OTP算法的使用受到相当有限的限制,因为它仅适用于表示互连地理区域的平面的矩阵,并且从一个节点移动到围绕它的八个相邻节点。本文属于水下搜索领域。

著录项

  • 作者

    Schedel, John Robert, Jr.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Operations research.;Civil engineering.;Management.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 222 p.
  • 总页数 222
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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