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Cryptosystems using subgroup distortion

Indira Chatterji Delaram Kahrobaei Ni Yen lu
Theoretical and Applied Informatics | 2017 | vol. 29 | No 1-2 | 14-24
Keywords hyberbolic groups symmetric key distortion
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Abstract

In this paper we propose cryptosystems based on subgroup distortion in hyperbolic groups. We also include concrete examples of hyperbolic groups as possible platforms.

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Authors and Affiliations

Indira Chatterji
Delaram Kahrobaei
Ni Yen lu

Il confine e il mare. Dispositivi di creazione letteraria nella macchina poietica di Enrico Morovich

Novella Di Nunzio
Kwartalnik Neofilologiczny | 2021 | No 1 | 15-27 | DOI: 10.24425/kn.2021.137031
Keywords exile border Mediterranean sea humor symmetrical logic
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Abstract

The reflection proposed in this article starts from the realities of the border and the sea, and from the problematic meaning they assumed in the frame of the city of Fiume (Rijeka) in the early twentieth century. The main goal is to explore how in the work of Enrico Morovich, an Italian writer coming from Fiume who had to personally and tragically experience war and exile, the border and the sea act as devices of literary creation, providing models of humorous reversal (the border) and symmetrical thinking (the sea). The analysis will focus in particular on the following works by Morovich: Cronache vicine e lontane (1981), La nostalgia del mare (1981), Un italiano di Fiume (1994).
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Bibliography

1. BACHTIN, M. M. (1979): “Autor i geroj v èstetičeskoj dejatel’nosti”, in ID.: Èstetika slovesnogo tvončestva, pod redaktsiyey S. G. Bočarov/S. S. Averincev, Iskusstvo, Moskva, 9–192.
2. ID. (1988): “L’autore e l’eroe nell’attività estetica”, in: ID.: L’autore e l’eroe. Teoria letteraria e scienze umane, a cura e trad. it. di C. STRADA JANOVIČ, Einaudi, Torino, 5–187.
3. BELLABARBA, M. (2014a): L’impero asburgico, Il Mulino, Bologna.
4. ID. (2014b): “Un impero multinazionale nella guerra delle nazioni. Lo strano caso dell’impero asburgico”, Studium, 110/6, 830–840.
5. BORONI, C. (2015): “Prefazione” a: MOROVICH, E.: I racconti per il “Giornale di Brescia”, a cura di C. BORONI, La Compagnia della Stampa Massetti Rodella Editori, Brescia, 13–57.
6. CIMADOR, G. (2018): “Bruno Maier: forme, categorie, aspetti del comico”, Archeografo Triestino, Serie IV, vol. LXXVIII (CXXVI della Raccolta), Trieste, 179–253.
7. D’ALESSANDRO, L. (2014): Mediterraneo crocevia di storia e culture: un caleidoscopio di immagini, Harmattan Italia, Torino.
8. MATTE BLANCO, I. (1975): The unconscious as infinite sets. An essay in bi‑logic, Duckworth, London.
9. MATVEJEVIĆ, P. (2006): Breviario del Mediterraneo, trad. it. di S. Ferrari, Garzanti, Milano.
10. MOROVICH, E. (1981a): Cronache vicine e lontane, San Marco dei Giustiniani, Genova.
11. ID. (1981b): La nostalgia del mare, Unimedia, Genova.
12. ID. (1985): Racconti di Fiume e altre cose, Compagnia dei Librai, Genova.
13. ID. (1988): Miracoli quotidiani, Sellerio, Palermo.
14. ID. (1994): Un italiano di Fiume, Rusconi, Milano.
15. ID. (2014): “Per una storia di Fiume”, Fiume. Rivista di studi adriatici, 29, 3–30.
16. MOROVICH, E./ VERDINO, S. (1990): Intervista a Enrico Morovich. Realizzata dal professor Stefano Verdino 21 novembre 1990, a cura della Provincia di Genova, Fondazione Mario Novaro, s.n., Genova, I: https://www.youtube.com/watch?v=MUQxNu7v2L8&t=290s; II: https://www. youtube.com/watch?v=4Rc1PI7L2_A; III: https://www.youtube.com/watch?v=YkWN9- sYE7rk; IV: https://www.youtube.com/watch?v=ebQybG9MjcA&t=9s.
17. ROMBI, B. (1997): Morovich oltre i confini, Editrice Liguria, Savona.
18. STELLI, G. (a cura di) (2006): Fiume, crocevia di popoli e culture, Atti del convegno internazionale, Roma, 27 ottobre 2005, Società di studi fiumani, Roma.

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Authors and Affiliations

Novella Di Nunzio
1
  1. Vilniaus Universitetas, Vilnius

On the solution of the implicit Roesser model

N.P. Karampetakis
Bulletin of the Polish Academy of Sciences Technical Sciences | 2007 | vol. 55 | No 4 | 365-378
Keywords Roesser model forward solution backward solution symmetric solution implicit 2-D systems fundamental matrix sequence
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Abstract

The main objective of this work is to provide a closed formula for the backward and symmetric solution of the 2-D implicit Roesser model. The relative forward and backward fundamental matrix is of fundamental importance in our approach. An algorithm for the

determination of the backward fundamental matrix sequense is also given.

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Authors and Affiliations

N.P. Karampetakis

Fracture mechanical properties of rock-like materials under half symmetric loading

Zhi Wang Jiajia Zhou Long Li
Archives of Civil Engineering | 2017 | No 4 | 71-82
Keywords half symmetric loading Mode II fracture fracture toughness rock-like material interaction integralmethod
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Abstract

The authors studied the fracture mechanical properties under half-symmetric loading in this paper. The stress distribution around the crack tip and the stress intensity factor of three kinds of notched specimens under half symmetric loading were compared. The maximum tensile stress σmax of double notch specimens was much greater than that of single notch specimens and the maximum shear stress τmax was almost equal, which means that the single notch specimens were more prone to Mode II fractures. The intensity factors KII of central notch specimens were very small compared with other specimens and they induced Mode I fractures. For both double notch and single notch specimens, KII was kept at a constant level and did not change with the change of a/h, and KII was much larger than KI. KII has the potential to reach its fracture toughness KIIC before KI and Mode II fractures occurred. Rock-like materials were introduced to produce single notch specimens. Test results show that the crack had been initiated at the crack tip and propagated along the original notch face, and a Mode II fracture occurred. There was no relationship between the peak load and the original notch length. The average value of KIIC was about 0.602 MPa×m1/2, and KIIC was about 3.8 times KIC. The half symmetric loading test of single notch specimens was one of the most effective methods to obtain a true Mode II fracture and determine Mode fracture toughness.

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Authors and Affiliations

Zhi Wang
Jiajia Zhou
Long Li

A Symmetric Approach in the Three-Dimensional Digital Waveguide Modeling of the Vocal Tract

Tahir Mushtaq Ahmad Kamran Muhammad Zubair Akbar Qureshi Zafar Iqbal
Archives of Acoustics | 2023 | vol. 48 | No 3 | 317-324 | DOI: 10.24425/aoa.2023.146641
Keywords symmetric digital waveguide vocal tract delay lines rectilinear uniform grid
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Abstract

Simulation of wave propagation in the three-dimensional (3D) modeling of the vocal tract has shown significant promise for enhancing the accuracy of speech production. Recent 3D waveguide models of the vocal tract have been designed for better accuracy but require a lot of computational tasks. A high computational cost in these models leads to novel work in reducing the computational cost while retaining accuracy and performance. In the current work, we divide the geometry of the vocal tract into four equal symmetric parts with the introduction of two axial perpendicular planes, and the simulation is performed on only one part. A novel strategy is defined to implement symmetric conditions in the mesh. The complete standard 3D digital waveguide model is assumed as a benchmark model. The proposed model is compared with the benchmark model in terms of formant frequencies and efficiency. For the demonstration, the vowels /O/, /i/, /E/, /A/, and /u/ have been selected for the simulations. According to the results, the benchmark and current models are nearly identical in terms of frequency profiles and formant frequencies. Still the current model is three times more effective than the benchmark model.
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Authors and Affiliations

Tahir Mushtaq
1
Ahmad Kamran
1
Muhammad Zubair Akbar Qureshi
2
Zafar Iqbal
3
  1. Department of Mathematics, COMSATS University Islamabad, Vehari Campus, Vehari, Pakistan
  2. Department of Mathematics, Air University, Islamabad, Pakistan
  3. Department of Mathematics, Government Graduate College of Science, Multan, Pakistan

Comparison of Wear Resistance in Polycrystalline and Monocrystalline Iron

Zhiming Liu Qiang Zhang Fangying Liu Hezhe Zhang
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 1 | 15-20 | DOI: 10.24425/amm.2023.141466
Keywords Molecular dynamics Polycrystalline Centro symmetric analysis Abrasive wear
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Abstract

In the present research, we used molecular dynamics simulation to determine the effect of cutting parameters on micro-grain boundary structures and Burgers vector distribution in single crystal iron and polycrystalline iron materials. The result showed that the destruction of the lattice in polycrystalline iron caused by the cutting tool was restricted to the contact surface area. In addition, in the precision machining process, a higher refining grain was observed on the iron surface. During the cutting process of single crystal iron, large-scale slip occurred along the <111> crystal direction on the {110} crystal plane. And the slip presented an annular shape.
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Authors and Affiliations

Zhiming Liu
1
Qiang Zhang
2
Fangying Liu
2
Hezhe Zhang
2
  1. China University of Mining and Technology (Beijing), Beijing 100083, China
  2. Shandong University of Science and Technology, Qingdao 266590, Shandong, China

An Identification of the Material Hardening Parameters for Cyclic Loading – Experimental and Numerical Studies

A. Skrzat Marta Wójcik
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 2 | 779-786 | DOI: 10.24425/amm.2020.132820
Keywords ratchetting cyclic plasticity non-symmetrical stress load finite element method
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Abstract

This paper presents the results of experimental studies and numerical simulations of the ratcheting for the PA6 aluminum. In the initial determination of the material hardening parameters, the samples were subjected to the symmetrical strain-controlled cyclic tension-compression test. The experimental stress-strain curve was compared with the numerical one obtained for non-linear Frederick-Armstrong and Voce models. For better fitting of both curves, the optimization procedure based on the least-square method and the fuzzy logic was applied. After establishing the hardening parameters, numerical simulations of the ratcheting were made. The boundary value problem was solved by means of discrete analysis. The data (force and displacement) obtained in numerical computations were used to control the ratchetting experiment. The results of experiments and numerical calculations were compared. Good convergence proves the reliability of the determination of material hardening data.

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Authors and Affiliations

A. Skrzat
ORCID: ORCID
Marta Wójcik
ORCID: ORCID

A new multi-attribute group decision-making method based on probabilistic multi-valued linguistic spherical fuzzy sets for the site selection of charging piles

Xue Feng Shifeng Liu Wuhuan Xu
Archives of Control Sciences | 2024 | vol. 34 | No 1 | 171-210 | DOI: 10.24425/acs.2024.149657
Keywords site selection of charging piles probabilistic multi-valued linguistic spherical fuzzysets generalized Maclaurin symmetric mean power generalized Maclaurin symmetric mean
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Abstract

Motivated by the concepts of low carbon and environmental protection, electric vehicles have received much attention and become more and more popular all around the world. The expanding demand for electric vehicles has driven the rapid development of the charging pile industry. One of the prominent issues in charging pile industry is to determine their sites, which is a complex decision-making problem. As a matter of factor, the process of charging piles sites selection can be regarded as multi-attribute group decision-making (MAGDM), which is the main topic of this paper. The recently proposed linguistic spherical fuzzy sets (LSFSs) composed of the linguistic membership degree, linguistic abstinence degree and linguistic non-membership degree are powerful tools to express the evaluation information of decision makers (DMs). Based on the concept of LSFSs, we introduce probabilistic multi-valued linguistic spherical fuzzy sets (PMVLSFSs), which can describe DMs’ fuzzy evaluation information in a more refined and accurate way. The operation rules of PMVLSFSs are also developed in this article. To effectively aggregate PMVLSFSs, the probabilistic multi-valued linguistic spherical fuzzy power generalized Maclaurin symmetric mean operator and the probabilistic multi-valued linguistic spherical fuzzy power weighted generalized Maclaurin symmetric mean are put forward. Based on the above aggregation operators, a new method for MAGDM problem with PMVLSFSs is established. Further, a practical case of suitable site selection of charging pile is used to verify the practicability of this method. Lastly, comparative analysis with other methods is performed to illustrate the advantages and stability of proposed method.
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Authors and Affiliations

Xue Feng
1 2
ORCID: ORCID
Shifeng Liu
1
ORCID: ORCID
Wuhuan Xu
3
ORCID: ORCID
  1. School of Economics and Management, Beijing Jiaotong University, Beijing, China
  2. Beijing Logistics Informatics Research Base, Beijing, China
  3. School of Economics and Management, BeihangUniversity, Beijing, China

Multi-attribute decision-making based on q-rung dual hesitant power dual Maclaurin symmetric mean operator and a new ranking method

Li Li Jun Wang Chunliang Ji
Archives of Control Sciences | 2022 | vol. 32 | No 3 | 627-658 | DOI: 10.24425/acs.2022.142852
Keywords q-rung dual hesitant fuzzy sets power geometric dual Maclaurin symmetric mean power dual Maclaurin symmetric mean multi-attribute decision-making
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Abstract

The ability of q-rung dual hesitant fuzzy sets (q-RDHFSs) in dealing with decision makers’ fuzzy evaluation information has received much attention. This main aim of this paper is to propose new aggregation operators of q-rung dual hesitant fuzzy elements and employ them in multi-attribute decision making (MADM). In order to do this, we first propose the power dual Maclaurin symmetric mean (PDMSM) operator by integrating the power geometric (PG) operator and the dual Maclaurin symmetric mean (DMSM). The PG operator can reduce or eliminate the negative influence of decision makers’ extreme evaluation values, making the final decision results more reasonable. The DMSM captures the interrelationship among multiple attributes. The PDMSM takes the advantages of both PG and DMSM and hence it is suitable and powerful to fuse decision information. Further, we extend the PDMSM operator to q-RDHFSs and propose q-rung dual hesitant fuzzy PDMSM operator and its weighted form. Properties of these operators are investigated. Afterwards, a new MADM method under q-RDHFSs is proposed on the basis on the new operators. Finally, the effectiveness of the new method is testified through numerical examples.
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Authors and Affiliations

Li Li
1
Jun Wang
2
ORCID: ORCID
Chunliang Ji
3
  1. School of Economics and Management, Beihang University, Beijing 100191, China
  2. School of Economics and Management, Beijing University of Chemical Technology, Beijing 100029, China
  3. School of Economics and Management, Beijing Jiaotong University, Beijing100044, China

Spherical fuzzy power partitioned Maclaurin Symmetric Mean Operators and their application in Multiple Attribute Group Decision Making

Huiyuan Zhang Qiang Cai Guiwu Wei
Archives of Control Sciences | 2023 | vol. 33 | No 1 | 179-238 | DOI: 10.24425/acs.2023.145119
Keywords spherical fuzzy sets partitioned Maclaurin symmetric mean operator power average operator multiple attribute group decision making
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Abstract

Spherical fuzzy sets (SFSs) provide more free space for decision makers (DMs) to express preference information from four aspects: approval, objection, abstention and refusal. The partitioned Maclaurin symmetric mean (PMSM) operator is an effective information fusion tool, which can fully capture the interrelationships among any multiple attributes in the same block whereas attributes in different block are unrelated. Therefore, in this paper,we first extendPMSM operator to spherical fuzzy environment and develop spherical fuzzy PMSM (SFPMSM) operator as well as spherical fuzzy weighted PMSM (SFWPMSM) operator. Meanwhile, we discuss some properties and special cases of these two operators. To diminish the impact of extreme evaluation values on decision-making results, then we integrate power average (PA) operator and PMSM operator to further develop spherical fuzzy power PMSM (SFPPMSM) operator and spherical fuzzy weighted power PMSM (SFWPPMSM) operator and also investigate their desirable properties. Subsequently, a new multiple attribute group decision making (MAGDM) method is established based on SFWPPMSM operator under spherical fuzzy environment. Finally, two numerical examples are used to illustrate the proposed method, and comparative analysis with the existing methods to further testy the validity and superiority of the proposed method.
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Authors and Affiliations

Huiyuan Zhang
1 2
Qiang Cai
3
Guiwu Wei
4 3
  1. School of Mathematics and Statistics, Liupanshui Normal University, Liupanshui 553004, Guizhou, P.R. China
  2. School of Mathematical Sciences, Sichuan Normal University, Chengdu, 610101, P.R. China
  3. School of Business, Sichuan Normal University, Chengdu, 610101, P.R. China
  4. School of Mathematical Sciences, Sichuan NormalUniversity, Chengdu, 610101, P.R. China

A novel source side power quality improved soft starting of three-phase induction motor using a symmetrical angle controller through pic microcontroller

S. Selvaperumal N. Krishnamoorthy G. Prabhakar
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 2 | e136746 | DOI: 10.24425/bpasts.2021.136746
Keywords soft starting of three phase induction motor symmetrical angle controller AC voltage controller power quality improvement
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Abstract

PIC microcontroller has a vital role in various types of controllers and nowadays the presence of PIC microcontroller is unavoidable in most control applications. This paper describes the enhancement of soft starting of induction motors using PIC microcontroller. Soft starting is required for the induction motors with reduced applied voltages so that the peak starting current is reduced and the startup of the motor is smooth with controlled torque and reduced mechanical vibrations, reduced starting current with correspondingly reduced bus voltage drops. While many of the available schemes of soft starting offer better results in view of smooth starting process, the proposed methodology offers soft starting as well as it cares about the source current quality. In contrast to the conventional multistep starting scheme, in this work a continuously controlled starting scheme is proposed. The three phase AC voltage controller topology is used as the core controller. In each of the half cycles, instead of a single conduction period with a single delay angle, the proposed AC voltage controller is switched symmetrically in each half cycle with multiple pulses in each quarter cycle. Symmetrically placed fixed numbers of switching pulses are used. The paper also describes the various time ratio controls namely the phase angle controller, the extinction angle controller and the symmetrical angle controller. The design aspects of the proposed soft starting scheme and the validation of the proposed system in the MATLAB SIMULINK environment are presented in this paper.
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Bibliography

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  6.  E.C. Carmo, V.F. Mendes, M.F. Santos, and L.A. Silva, “Starting large induction motors alternatives for emergency generation system”, 2018 Simposio Brasileiro de Sistemas Eletricos (SBSE), Niteroi, 2018, pp. 1‒6, doi: 10.1109/SBSE.2018.8395772.
  7.  A. Gastli and M.M. Ahmed, “ANN-based soft starting of Voltage-controlled-fed IM drive system”, IEEE Trans. Energy Convers. 20, 497‒503(2005).
  8.  H. Wadke, P. Gurav, S. Ghaytadak, and A. Singh, “Power Factor Improvement for Induction Motor by Using Capacitor Bank”, Int. J. Res. Eng. Sci. Manag. 1(1), 77‒79 (2018).
  9.  M. Hyla, “Start-up of large-power synchronous motor with the 6 kV voltage source inverter and microprocessor-controlled unit for excitation supply”, J. Electr. Eng. 69(1), 156‒162 (2018), doi: 10.2478/jee-2018-0019.
  10.  V. Volkov and A. A. Kolesnikov, “Energy-saving speed control of frequency-controlled induction motors on starting and decelerating”, Russ. Electr. Eng. 84(1), 237‒243(2013).
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Authors and Affiliations

S. Selvaperumal
1
ORCID: ORCID
N. Krishnamoorthy
2
G. Prabhakar
3
ORCID: ORCID
  1. Department of EEE, Syed Ammal Engineering College, Ramanathapuram, Tamilnadu, India
  2. SBM College of Engineering and Technology, Dindigul-624005, Tamilnadu, India
  3. Department of EEE, V.S.B. Engineering College, Karur, Tamilnadu, India

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Jitendra Singh Atul Lanjewar
Archives of Thermodynamics | 2024 | vol. 45 | No 1 | 33-44 | DOI: 10.24425/ather.2024.150436
Keywords Full/Half symmetrical arc rib Additional gap Nusselt number Thermohydraulic performance parameter
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Abstract

This study aims to investigate and compare the thermal performance of a solar air heater using a passive technique to enhance heat transfer between the absorber plate and the flowing fluid. The technique involves generating turbulence near the heat transferring surface through the use of artificial rib roughness. The study focuses on two different novel roughness geome-tries: full symmetrical arc rib roughness and half symmetrical arc rib roughness. By introducing additional gaps and varying the number of gaps in the roughness geometries, the study examines their effects on the solar air heaters thermal performance. The artificially roughened surface creates different turbulent zones, which are essential to the development of different types of turbulence in the vicinity of the heat transferring surface. The study finds that an optimal escalation in Nusselt number and friction factor by 2.36 and 3.45 times, respectively, occurs at certain gap numbers as 6 and ng as 5 for full symmetrical arc rib roughness. The maximum thermal-hydraulic performance parameter of 1.66 is attained at a Reynolds number of 6 000. The study also conducts correlation, mathematical modeling, and performance prediction under different operating circumstances.
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Authors and Affiliations

Jitendra Singh
1
Atul Lanjewar
1
  1. MANIT, Bhopal 462033, India

Evaluation of medical service quality based on a novel multi-criteria decision-making method with unknown weighted information

Butian Zhao Runtong Zhang Yuping Xing
Archives of Control Sciences | 2021 | vol. 31 | No 3 | 645-685 | DOI: 10.24425/acs.2021.138696
Keywords interval-valued q-rung dual hesitant fuzzy set Maclaurin symmetric mean operator multi-criteria decision-making aggregation operators
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Abstract

In modern society, people concern more about the evaluation of medical service quality. Evaluation of medical service quality is helpful for medical service providers to supervise and improve their service quality. Also, it will help the public to understand the situation of different medical providers. As a multi-criteria decision-making (MCDM) problem, evaluation of medical service quality can be effectively solved by aggregation operators in interval-valued q-rung dual hesitant fuzzy (IVq-RDHF) environment. Thus, this paper proposes interval-valued q-rung dual hesitant Maclaurin symmetric mean (IVq-RDHFMSM) operator and interval-valued q-rung dual hesitant weighted Maclaurin symmetric mean (IVq-RDHFWMSM) operator. Based on the proposed IVq-RDHFWMSM operator, this paper builds a novel approach to solve the evaluation problem of medical service quality including a criteria framework for the evaluation of medical service quality and a novel MCDM method. What’s more, aiming at eliminating the discordance between decision information and weight vector of criteria determined by decisionmakers (DMs), this paper proposes the concept of cross-entropy and knowledge measure in IVq-RDHF environment to extract weight vector from DMs’ decision information. Finally, this paper presents a numerical example of the evaluation of medical service for hospitals to illustrate the availability of the novel method and compares our method with other MCDM methods to demonstrate the superiority of our method. According to the comparison result, our method has more advantages than other methods.
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Bibliography

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Authors and Affiliations

Butian Zhao
1
Runtong Zhang
1
Yuping Xing
2
  1. School of Management and Economic, Beijing Jiaotong University, Beijing, 100044, China
  2. Glorious Sun School of Business and Management, DongHua University, Shanghai, 200051, China

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