Special Issue "Symmetry in Engineering Sciences II"

A special issue of Symmetry (ISSN 2073-8994).

Deadline for manuscript submissions: 31 January 2020.

Special Issue Editors

Guest Editor
Prof. Dr. Raúl Baños Navarro Website E-Mail
University of Almería, 04120 Almería, Spain
Interests: electrical engineering; renewable energy; computational optimization; engineering optimization; network optimization
Co-Guest Editor
Prof. Dr. Francisco G. Montoya Website E-Mail
University of Almería, 04120 Almería, Spain
Interests: power engineering; optimization techniques; ICT

Special Issue Information

Dear Colleagues,

Symmetry is a frequent pattern widely studied in different research fields. In particular, complex systems with symmetric and asymmetric characteristics arise in engineering science (e.g., in mechanical engineering, symmetric and synchronized systems are often used to satisfy stability criteria for rotating structures; in electrical engineering, the study of symmetrical and asymmetrical faults in power systems is a critical issue; in telecommunications engineering, many systems are symmetrical since data speed or quantity is the same in both directions; in civil engineering, the strength of the objects depends on the symmetry; in computer engineering, symmetric network structures and symmetric algorithms are often studied; etc.).

This Special Issue invites researchers to submit original research papers and review articles related to any engineering discipline in which theoretical or practical issues of symmetry are considered. The topics of interest include (but are not limited to):

  • Symmetry in electrical engineering (power, electronics, electromechanics, computer, control, microwaves, telecommunications, etc.);
  • Symmetry in mechanical engineering (acoustical, aerospace, automotive, marine, railway, thermal, etc.);
  • Symmetry in civil engineering (architectural, construction, earthquake, environmental, hydraulic, mining, structural, transportation, etc.);
  • Symmetry in chemical engineering (biochemical, molecular, processes, thermodynamics, etc.);
  • Symmetry in other interdisciplinary engineering disciplines (agricultural, biomedical, graphical modelling, industrial, information, materials, metallurgy, military, nanotechnology, control, automation, robotics, etc.);
  • Symmetry and topology of complex networks in engineering;

Symmetry and optimization in engineering applications.

Prof. Dr. Raúl Baños Navarro
Prof. Dr. Francisco G. Montoya
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Symmetry and asymmetry
  • Symmetry and synchronization
  • Symmetry operations
  • Symmetry measures
  • Topological symmetry
  • Geometric symmetry
  • Symmetry in complex systems
  • Complex networks and graphs
  • Optimization
  • Computation
  • Electrical engineering
  • Mechanical engineering
  • Civil engineering
  • Chemical engineering

Published Papers (3 papers)

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Research

Open AccessArticle
Study on Stiffness-Oriented Cable Tension Distribution for a Symmetrical Cable-Driven Mechanism
Symmetry 2019, 11(9), 1158; https://doi.org/10.3390/sym11091158 - 11 Sep 2019
Abstract
In this paper, we focus on the issues pertaining to stiffness-oriented cable tension distribution for a symmetrical 6-cable-driven spherical joint module (6-CSJM), which can be employed to construct modular cable-driven manipulators. Due to the redundant actuation of the 6-CSJM, three cables are employed [...] Read more.
In this paper, we focus on the issues pertaining to stiffness-oriented cable tension distribution for a symmetrical 6-cable-driven spherical joint module (6-CSJM), which can be employed to construct modular cable-driven manipulators. Due to the redundant actuation of the 6-CSJM, three cables are employed for position regulation by adjusting the cable lengths, and the remaining three cables are utilized for stiffness regulation by adjusting the cable tensions, i.e., the position and stiffness can be regulated simultaneously. To increase the range of stiffness regulation, a variable stiffness device (VSD) is designed, which is serially connected to the driving cable. Since the stiffness model of the 6-CSJM with VSDs is very complicated, it is difficult to directly solve the cable tensions from the desired stiffness. The stiffness-oriented cable tension distribution issue is formulated as a nonlinear constrained optimization problem, and the Complex method is employed to obtain optimal tension distributions. Furthermore, to significantly improve the computation efficiency, a decision variable elimination technique is proposed to deal with the equality constraints, which reduces decision variables from 6 to 3. A comprehensive simulation study is conducted to verify the effectiveness of the proposed method, showing that the 6-CSJM can accurately achieve the desired stiffness through cable tension optimization. Full article
(This article belongs to the Special Issue Symmetry in Engineering Sciences II)
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Open AccessArticle
Routing for Hazardous Materials Transportation in Urban Areas
Symmetry 2019, 11(9), 1091; https://doi.org/10.3390/sym11091091 - 01 Sep 2019
Abstract
Hazardous materials (HAZMAT) are important for daily production in cities, which usually have a high population. To avoid the threat to public safety and security, the routes for HAZMAT transportation should be planned legitimately by mitigating the maximum risk to population centers. For [...] Read more.
Hazardous materials (HAZMAT) are important for daily production in cities, which usually have a high population. To avoid the threat to public safety and security, the routes for HAZMAT transportation should be planned legitimately by mitigating the maximum risk to population centers. For the objective of min-max local risk in urban areas, this study has newly proposed an optimization model where the service of a link for HAZMAT transportation was taken as the key decision variable. Correspondingly, the symmetric problem of min-max optimization takes significant meanings. Moreover, in consideration of the work load of solving the model under a lot of decision variables, a heuristic algorithm was developed to obtain an optimal solution. Thereafter, a case study was made to test the proposed model and algorithm, and the results were compared with those generated by deterministic solving approaches. In addition, this research is able to be an effective reference for authorities on the management of HAZMAT transportation in urban areas. Full article
(This article belongs to the Special Issue Symmetry in Engineering Sciences II)
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Open AccessArticle
High-Precision Authentication Scheme Based on Matrix Encoding for AMBTC-Compressed Images
Symmetry 2019, 11(8), 996; https://doi.org/10.3390/sym11080996 - 03 Aug 2019
Abstract
In this paper, a high-precision image authentication scheme for absolute moment block truncation coding (AMBTC)-compressed images is presented. For each block, two sub-bitmaps are conducted using the symmetrical separation, and the six-bit authentication code is symmetrically assigned to two sub-codes, which is virtually [...] Read more.
In this paper, a high-precision image authentication scheme for absolute moment block truncation coding (AMBTC)-compressed images is presented. For each block, two sub-bitmaps are conducted using the symmetrical separation, and the six-bit authentication code is symmetrically assigned to two sub-codes, which is virtually embedded into sub-bitmaps using the matrix encoding later. To overcome distortion caused by modifications to the bitmap, the corresponding to-be-flipped bit-location information is recorded instead of flipping these bits of the bitmap directly. Then, the bit-location information is inserted into quantization levels based on adjusted quantization level matching. In contrast to previous studies, the proposed scheme offers a significantly improved tampering detection ability, especially in the first hierarchical tampering detection without remediation measures, with an average tampering detection rate of up to 98.55%. Experimental results show that our approach provides a more stable and reliable tampering detection performance and sustains an acceptable visual quality. Full article
(This article belongs to the Special Issue Symmetry in Engineering Sciences II)
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