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Symmetry, Volume 9, Issue 1

January 2017 - 18 articles

Cover Story: The border lines of terraces in vicinal surfaces and the shape of diffusion-limited eroding surfaces are described by the same underlying mathematical model. The roughness of these interfaces obeys Family–Viscek scaling with dynamical exponent z=1. Although the continuum equation of the surface height is non-local, it has an infinite-dimensional dynamical symmetry which is isomorphic to the direct sum of three centre-less Virasoro algebras. The explicit construction of this symmetry involves spatially non-local Lie algebra generators. View the paper
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Articles (18)

  • Article
  • Open Access
22 Citations
6,979 Views
15 Pages

Some Invariants of Jahangir Graphs

  • Mobeen Munir,
  • Waqas Nazeer,
  • Shin Min Kang,
  • Muhammad Imran Qureshi,
  • Abdul Rauf Nizami and
  • Youl Chel Kwun

23 January 2017

In this report, we compute closed forms of M-polynomial, first and second Zagreb polynomials and forgotten polynomial for Jahangir graphs Jn,m for all values of m and n. From the M-polynomial, we recover many degree-based topological indices such as...

  • Article
  • Open Access
7 Citations
7,146 Views
12 Pages

22 January 2017

This paper presents a fully integrated on-chip switched-capacitor (SC) DC–DC converter that supports a programmable regulated power supply ranging from 2.6 to 3.2 V out of a 5 V input supply. The proposed 4-to-3 step-down topology utilizes two conven...

  • Article
  • Open Access
7 Citations
4,822 Views
16 Pages

21 January 2017

The Crank–Nicolson method can be used to solve the Black–Scholes partial differential equation in one-dimension when both accuracy and stability is of concern. In multi-dimensions, however, discretizing the computational grid with a Crank–Nicolson sc...

  • Article
  • Open Access
27 Citations
9,591 Views
13 Pages

Data-Filtering System to Avoid Total Data Distortion in IoT Networking

  • Dae-Young Kim,
  • Young-Sik Jeong and
  • Seokhoon Kim

20 January 2017

In the Internet of Things (IoT) networking, numerous objects are connected to a network. They sense events and deliver the sensed information to the cloud. A lot of data is generated in the IoT network, and servers in the cloud gather the sensed data...

  • Feature Paper
  • Article
  • Open Access
6 Citations
5,275 Views
17 Pages

20 January 2017

A simplified Keller–Segel model is studied by means of Lie symmetry based approaches. It is shown that a (1 + 2)-dimensional Keller–Segel type system, together with the correctly-specified boundary and/or initial conditions, is invariant with respect...

  • Article
  • Open Access
1 Citations
6,169 Views
15 Pages

Generalized Null 2-Type Surfaces in Minkowski 3-Space

  • Dae Won Yoon,
  • Dong-Soo Kim,
  • Young Ho Kim and
  • Jae Won Lee

20 January 2017

For the mean curvature vector field H and the Laplace operator Δ of a submanifold in the Minkowski space, a submanifold satisfying the condition Δ H = f H + g C is known as a generalized null 2-type, where f and g are smooth functions,...

  • Article
  • Open Access
8 Citations
7,007 Views
19 Pages

20 January 2017

A novel orthogonal multi-swarm cooperative particle swarm optimization (PSO) algorithm with a particle trajectory knowledge base is presented in this paper. Different from the traditional PSO algorithms and other variants of PSO, the proposed orthogo...

  • Article
  • Open Access
4 Citations
4,332 Views
9 Pages

13 January 2017

In this paper, we discuss stochastic comparisons of lifetimes of series and parallel systems with heterogeneous Fréchet components in terms of the usual stochastic order, reversed hazard rate order and likelihood ratio order. The partial results esta...

  • Article
  • Open Access
9 Citations
8,882 Views
16 Pages

12 January 2017

This study develops a model for essay scoring and article relevancy. Essay scoring is a costly process when we consider the time spent by an evaluator. It may lead to inequalities of the effort by various evaluators to apply the same evaluation crite...

  • Article
  • Open Access
7 Citations
6,808 Views
17 Pages

DIaaS: Resource Management System for the Intra-Cloud with On-Premise Desktops

  • Hyun-Woo Kim,
  • Jaekyung Han,
  • Jong Hyuk Park and
  • Young-Sik Jeong

9 January 2017

Infrastructure as a service with desktops (DIaaS) based on the extensible mark-up language (XML) is herein proposed to utilize surplus resources. DIaaS is a traditional surplus-resource integrated management technology. It is designed to provide fast...

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Symmetry - ISSN 2073-8994Creative Common CC BY license