scholarly journals A New Approach to Detection of Changes in Multidimensional Patterns

2021 ◽  
Vol 11 (3) ◽  
pp. 217-227
Author(s):  
Tomasz Gałkowski ◽  
Adam Krzyżak ◽  
Zofia Patora-Wysocka ◽  
Zbigniew Filutowicz ◽  
Lipo Wang

Abstract In the paper we develop an algorithm based on the Parzen kernel estimate for detection of sudden changes in 3-dimensional shapes which happen along the edge curves. Such problems commonly arise in various areas of computer vision, e.g., in edge detection, bioinformatics and processing of satellite imagery. In many engineering problems abrupt change detection may help in fault protection e.g. the jump detection in functions describing the static and dynamic properties of the objects in mechanical systems. We developed an algorithm for detecting abrupt changes which is nonparametric in nature and utilizes Parzen regression estimates of multivariate functions and their derivatives. In tests we apply this method, particularly but not exclusively, to the functions of two variables.

2019 ◽  
Vol 19 ◽  
pp. 100347 ◽  
Author(s):  
Muhammad Khan Asif ◽  
Norliza Ibrahim ◽  
Samah M. Al-Amery ◽  
Jacob John ◽  
Phrabhakaran Nambiar

2011 ◽  
Vol 219-220 ◽  
pp. 458-462
Author(s):  
Ze Ying Yang ◽  
Xi Bin Zhang ◽  
Jian Bo Qu

According to Dawenkou bridge, a seriously deteriorated rigid-frame arch bridge, typical deteriorations of rigid-frame arch bridges were summarized. Based on 3-dimensional finite element model of a rigid-frame arch bridge, the relationship between dynamic properties and deteriorations of the structure, especially the influence of lateral tie system on the dynamic properties of the structure was analyzed. The results show that, damages of lateral tie system in operation induced premature appearance of lateral vibration directly; however, the large curvature torsion of deck obviously should take the mainly responsibility of damages of lateral tie system. According to the above analysis, the corresponding reinforcement scheme and specific measures were proposed.


2016 ◽  
Vol 16 (3) ◽  
pp. 459-474 ◽  
Author(s):  
Rihuan Ke ◽  
Wen Li ◽  
Mingqing Xiao

AbstractStochastic matrices play an important role in the study of probability theory and statistics, and are often used in a variety of modeling problems in economics, biology and operation research. Recently, the study of tensors and their applications became a hot topic in numerical analysis and optimization. In this paper, we focus on studying stochastic tensors and, in particular, we study the extreme points of a set of multi-stochastic tensors. Two necessary and sufficient conditions for a multi-stochastic tensor to be an extreme point are established. These conditions characterize the “generators” of multi-stochastic tensors. An algorithm to search the convex combination of extreme points for an arbitrary given multi-stochastic tensor is developed. Based on our obtained results, some expression properties for third-order and n-dimensional multi-stochastic tensors (${n=3}$ and 4) are derived, and all extreme points of 3-dimensional and 4-dimensional triply-stochastic tensors can be produced in a simple way. As an application, a new approach for the partially filled square problem under the framework of multi-stochastic tensors is given.


Author(s):  
Lindsay Hanna ◽  
Jonathan Cagan

Many heuristic optimization approaches have been developed to combat the ever-increasing complexity of engineering problems. In general, these approaches can be classified based on the diversity of the search strategies used, the amount of change to those search strategies during the optimization process, and the level of cooperation between the strategies. A review of the literature indicates that approaches which are simultaneously very diverse, highly dynamic, and cooperative are rare but have immense potential for finding high quality final solutions. In this work, a taxonomy of heuristic optimization approaches is introduced and used to motivate a new approach, entitled Protocol-based Multi-Agent Systems. This approach is found to produce final solutions of much higher quality when its implementation includes the use of multiple search protocols, the adaptation of those protocols during the optimization, and the cooperation between the protocols than when these characteristics are absent.


Author(s):  
T. Binazadeh ◽  
M. J. Yazdanpanah

In this paper, a new approach to design the 3-dimensional missile guidance law, based on partial stabilization, is presented. The approach is based on the classification of the state variables within the guidance system dynamics with respect to their required stabilization properties. The resulting guidance law enables the missile to intercept highly maneuvering targets within a finite interception time. Effectiveness of the proposed guidance law is demonstrated through analysis and simulations.


2017 ◽  
Vol 893 ◽  
pp. 26-30
Author(s):  
Lu Chen ◽  
Shankar Kalyanasundaram

This article examines the prediction of wrinkling initiation in self-reinforced thermoplastic composite materials for potential application in rapid forming of this class of materials. Whilst most of recent researches concentrate on examining metallic wrinkling behavior, this article aims to introduce a wrinkling indicator for composite sheet. The material system involved in the study is a self-reinforced polypropylene woven composite with a fiber orientation of 0°/90° along the warp and weft directions. Square specimens were stretched uniaxially along diagonal direction until the onset of wrinkling. It is observed that when the wrinkling occurs, strain increment ratio exhibits an abrupt change. This fundamental observation leads to the prediction of onset of wrinkling by using abrupt changes in strain increment ratio as a metric.


2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Lindsay Hanna Landry ◽  
Jonathan Cagan

Many heuristic optimization approaches have been developed to combat the ever-increasing complexity of engineering problems. In general, these approaches can be classified based on the diversity of the search strategies used, the amount of change in these search strategies during the optimization process, and the level of cooperation between these strategies. A review of the literature indicates that approaches that are simultaneously very diverse, highly dynamic, and cooperative are rare but have immense potential for finding high quality final solutions. In this work, a taxonomy of heuristic optimization approaches is introduced and used to motivate a new approach called protocol-based multi-agent systems. This approach is found to produce final solutions of much higher quality when its implementation includes the use of multiple search protocols, the adaptation of these protocols during the optimization, and the cooperation between these protocols than when these characteristics are absent.


2021 ◽  
Vol 10 (2) ◽  
pp. 3
Author(s):  
Laura Mena-Garcia ◽  
Jose C. Pastor-Jimeno ◽  
Miguel J. Maldonado ◽  
Maria B. Coco-Martin ◽  
Itziar Fernandez ◽  
...  

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