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Symmetry, Volume 9, Issue 10

October 2017 - 49 articles

Cover Story: Lorentz symmetry asserts that the vacuum has no special directions, and therefore clocks tick at the same rate no matter their orientation. If Lorentz symmetry is violated, however, then the frequency of clocks could depend on their orientation. This Lorentz violation may sometimes be represented as a uniform vector field. As Earth rotates, an atomic clock on its surface may then speed up and slow down as the angle between its quantization axis and the background vector field changes. We describe tests of Lorentz violation that have been performed in high-precision experiments with sensitive atomic clocks. View this paper
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Articles (49)

  • Article
  • Open Access
36 Citations
8,544 Views
22 Pages

23 October 2017

In this paper, a decision model based on a fuzzy soft set and ideal solution approaches is proposed. This new decision-making method uses the divide-and-conquer algorithm, and it is different from the existing algorithm (the choice value based approa...

  • Feature Paper
  • Article
  • Open Access
4 Citations
3,959 Views
14 Pages

23 October 2017

This paper discusses clock-comparison experiments, which may be used to test Lorentz symmetry to an extremely high level of precision. We include a brief overview of theoretical predictions for signals of Lorentz violation in clock-comparison experim...

  • Article
  • Open Access
6 Citations
9,337 Views
15 Pages

21 October 2017

Facial symmetry is believed to have an evolutionary significance and so its detection should be robust in natural settings. Previous studies of facial symmetry detection have used front views of faces where the decision could be made on 2D image prop...

  • Article
  • Open Access
17 Citations
6,883 Views
17 Pages

21 October 2017

Over the years, advanced IT technologies have facilitated the emergence of new ways of generating and gathering data rapidly, continuously, and largely and are associated with a new research and application branch, namely, data stream mining (DSM). A...

  • Article
  • Open Access
15 Citations
4,167 Views
17 Pages

Lattice-Based Revocable Certificateless Signature

  • Ying-Hao Hung,
  • Yuh-Min Tseng and
  • Sen-Shan Huang

20 October 2017

Certificateless signatures (CLS) are noticeable because they may resolve the key escrow problem in ID-based signatures and break away the management problem regarding certificate in conventional signatures. However, the security of the mostly previou...

  • Article
  • Open Access
17 Citations
8,398 Views
19 Pages

Fuzzy Logic-Based Model That Incorporates Personality Traits for Heterogeneous Pedestrians

  • Zhuxin Xue,
  • Qing Dong,
  • Xiangtao Fan,
  • Qingwen Jin,
  • Hongdeng Jian and
  • Jian Liu

20 October 2017

Most models designed to simulate pedestrian dynamical behavior are based on the assumption that human decision-making can be described using precise values. This study proposes a new pedestrian model that incorporates fuzzy logic theory into a multi-...

  • Article
  • Open Access
22 Citations
7,310 Views
29 Pages

Multi-Objective Optimization Algorithm Based on Sperm Fertilization Procedure (MOSFP)

  • Hisham A. Shehadeh,
  • Mohd Yamani Idna Ldris and
  • Ismail Ahmedy

20 October 2017

In this paper, we propose an extended multi-objective version of single objective optimization algorithm called sperm swarm optimization algorithm. The proposed multi-objective optimization algorithm based on sperm fertilization procedure (MOSFP) ope...

  • Article
  • Open Access
4 Citations
4,612 Views
27 Pages

20 October 2017

The products made by the forming of polycrystalline metals and alloys, which are in high demand in modern industries, have pronounced inhomogeneous distribution of grain orientations. The presence of specific orientation modes in such materials, i.e....

  • Article
  • Open Access
2 Citations
3,714 Views
20 Pages

The Interval Cognitive Network Process for Multi-Attribute Decision-Making

  • Xiuli Qi,
  • Chengxiang Yin,
  • Kai Cheng and
  • Xianglin Liao

19 October 2017

Aiming at combining the good characteristics of a differential scale in representing human cognition and the favorable properties of interval judgments in expressing decision-makers’ uncertainty, this paper proposes the interval cognitive network pro...

  • Feature Paper
  • Article
  • Open Access
34 Citations
6,010 Views
10 Pages

19 October 2017

A fundus image is an effective tool for ophthalmologists studying eye diseases. Retinal vessel detection is a significant task in the identification of retinal disease regions. This study presents a retinal vessel detection approach using shearlet tr...

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Symmetry - ISSN 2073-8994