Pub Date : 2018-06-29DOI: 10.12921/CMST.2016.0000069
Rajneesh Kumar, N. Sharma, P. Lata, M. Marin
A problem of reflection at a free surface of micropolar orthotropic piezothermoelastic medium is discussed in the present paper. It is found that there exist five type plane waves in micropolar orthotropic piezothermoelastic medium, namely quasi longitudinal displacement wave (quasi LD wave), quasi thermal wave (quasi T wave), quasi CD-I, quasi CD-II wave and electric potential wave (PE wave). The amplitude ratios corresponding to reflected waves are obtained numerically. The effect of angle of incidence and thermopiezoelectric interactions on the reflected waves are studied for a specific model. Some particular cases of interest are also discussed.
{"title":"Reflection of Plane Waves at Micropolar Piezothermoelastic Half-space","authors":"Rajneesh Kumar, N. Sharma, P. Lata, M. Marin","doi":"10.12921/CMST.2016.0000069","DOIUrl":"https://doi.org/10.12921/CMST.2016.0000069","url":null,"abstract":"A problem of reflection at a free surface of micropolar orthotropic piezothermoelastic medium is discussed in the present paper. It is found that there exist five type plane waves in micropolar orthotropic piezothermoelastic medium, namely quasi longitudinal displacement wave (quasi LD wave), quasi thermal wave (quasi T wave), quasi CD-I, quasi CD-II wave and electric potential wave (PE wave). The amplitude ratios corresponding to reflected waves are obtained numerically. The effect of angle of incidence and thermopiezoelectric interactions on the reflected waves are studied for a specific model. Some particular cases of interest are also discussed.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83356285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-29DOI: 10.12921/CMST.2017.0000053
T. Hofmann, J. Merker
Chaos in conservative systems, particularly in Hamiltonian systems, is different from chaos in dissipative systems. For example, not only the eigenvalues of the symmetric Jacobian, but also the global Lyapunov exponents of Hamiltonian systems occur in pairs (λ,−λ). In this article, we even show that appropriately defined local Lyapunov exponents occur in pairs, and in turn this allows to give a new and easily accessible proof of the pairing property for global Lyapunov exponents. As examples of low dimensional chaotic Hamiltonian systems, we discuss the classical Hénon-Heiles system and a sixth order generalisation. For the latter, there is numerical evidence of two disjoint chaotic seas.
{"title":"On Local Lyapunov Exponents of Chaotic Hamiltonian Systems","authors":"T. Hofmann, J. Merker","doi":"10.12921/CMST.2017.0000053","DOIUrl":"https://doi.org/10.12921/CMST.2017.0000053","url":null,"abstract":"Chaos in conservative systems, particularly in Hamiltonian systems, is different from chaos in dissipative systems. For example, not only the eigenvalues of the symmetric Jacobian, but also the global Lyapunov exponents of Hamiltonian systems occur in pairs (λ,−λ). In this article, we even show that appropriately defined local Lyapunov exponents occur in pairs, and in turn this allows to give a new and easily accessible proof of the pairing property for global Lyapunov exponents. As examples of low dimensional chaotic Hamiltonian systems, we discuss the classical Hénon-Heiles system and a sixth order generalisation. For the latter, there is numerical evidence of two disjoint chaotic seas.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"115 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90313229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-29DOI: 10.12921/CMST.2018.0000030
M. Stroiński, J. Weglarz, K. Wojciechowski
{"title":"Ian Snook Additional Prize 2017","authors":"M. Stroiński, J. Weglarz, K. Wojciechowski","doi":"10.12921/CMST.2018.0000030","DOIUrl":"https://doi.org/10.12921/CMST.2018.0000030","url":null,"abstract":"","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"47 1","pages":"81-81"},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78228235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-29DOI: 10.12921/cmst.2018.0000009
P. Sulewski
This paper proposes scenarios of generating contingency tables (CTs) with the probability flow parameter (PFP). It also defines measures of untruthfulness of H0 that involve PFP for all proposed scenarios. This paper is an attempt to replace a nonparametric statistical inference method by the parametric one. The paper applies the maximum likelihood method to estimate PFP and presents instructions to generate CTs by means of the bar method. The Monte Carlo method is used to carry out computer simulations.
{"title":"Nonparametric Versus Parametric Reasoning Based on 2×2 Contingency Tables","authors":"P. Sulewski","doi":"10.12921/cmst.2018.0000009","DOIUrl":"https://doi.org/10.12921/cmst.2018.0000009","url":null,"abstract":"This paper proposes scenarios of generating contingency tables (CTs) with the probability flow parameter (PFP). It also defines measures of untruthfulness of H0 that involve PFP for all proposed scenarios. This paper is an attempt to replace a nonparametric statistical inference method by the parametric one. The paper applies the maximum likelihood method to estimate PFP and presents instructions to generate CTs by means of the bar method. The Monte Carlo method is used to carry out computer simulations.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80335087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-29DOI: 10.12921/CMST.2016.0000071
U. Ghosh, Sudeep Sarkar
In this paper we have considered an SIR model with logistically grown susceptible in which the rate of incidence is directly affected by the inhibitory factors of both susceptible and infected populations and the protection measure for the infected class. Permanence of the solutions, global stability and bifurcation analysis in the neighborhood of equilibrium points has been investigated here. The Center manifold theory is used to find the direction of bifurcations. Finally numerical simulation is carried out to justify the theoretical findings.
{"title":"Global Stability Analysis of Logistically Grown SIR Model with Loss of Immunity, Inhibitory Effect, Crowding Effect and its Protection Measure","authors":"U. Ghosh, Sudeep Sarkar","doi":"10.12921/CMST.2016.0000071","DOIUrl":"https://doi.org/10.12921/CMST.2016.0000071","url":null,"abstract":"In this paper we have considered an SIR model with logistically grown susceptible in which the rate of incidence is directly affected by the inhibitory factors of both susceptible and infected populations and the protection measure for the infected class. Permanence of the solutions, global stability and bifurcation analysis in the neighborhood of equilibrium points has been investigated here. The Center manifold theory is used to find the direction of bifurcations. Finally numerical simulation is carried out to justify the theoretical findings.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"11 1","pages":"125-141"},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88391046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-26DOI: 10.12921/cmst.2018.0000035
W. G. Hoover, C. G. Hoover
Considerable research has led to ergodic isothermal dynamics which can replicate Gibbs' canonical distribution for simple ( small ) dynamical problems. Adding one or two thermostat forces to the Hamiltonian motion equations can give an ergodic isothermal dynamics to a harmonic oscillator, to a quartic oscillator, and even to the "Mexican-Hat" ( double-well ) potential problem. We consider here a time-reversible dynamical approach to Gibbs' "microcanonical" ( isoenergetic ) distribution for simple systems. To enable isoenergetic ergodicity we add occasional random rotations to the velocities. This idea conserves energy exactly and can be made to cover the entire energy shell with an ergodic dynamics. We entirely avoid the Poincare-section holes and island chains typical of Hamiltonian chaos. We illustrate this idea for the simplest possible two-dimensional example, a single particle moving in a periodic square-lattice array of scatterers, the "cell model".
{"title":"Ergodic Isoenergetic Molecular Dynamics for Microcanonical-Ensemble Averages","authors":"W. G. Hoover, C. G. Hoover","doi":"10.12921/cmst.2018.0000035","DOIUrl":"https://doi.org/10.12921/cmst.2018.0000035","url":null,"abstract":"Considerable research has led to ergodic isothermal dynamics which can replicate Gibbs' canonical distribution for simple ( small ) dynamical problems. Adding one or two thermostat forces to the Hamiltonian motion equations can give an ergodic isothermal dynamics to a harmonic oscillator, to a quartic oscillator, and even to the \"Mexican-Hat\" ( double-well ) potential problem. We consider here a time-reversible dynamical approach to Gibbs' \"microcanonical\" ( isoenergetic ) distribution for simple systems. To enable isoenergetic ergodicity we add occasional random rotations to the velocities. This idea conserves energy exactly and can be made to cover the entire energy shell with an ergodic dynamics. We entirely avoid the Poincare-section holes and island chains typical of Hamiltonian chaos. We illustrate this idea for the simplest possible two-dimensional example, a single particle moving in a periodic square-lattice array of scatterers, the \"cell model\".","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"99 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80913941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-11DOI: 10.12921/cmst.2018.0000032
W. Hoover, C. G. Hoover
The one-dimensional $phi^4$ Model generalizes a harmonic chain with nearest-neighbor Hooke's-Law interactions by adding quartic potentials tethering each particle to its lattice site. In their studies of this model Kenichiro Aoki and Dimitri Kusnezov emphasized its most interesting feature : because the quartic tethers act to scatter long-wavelength phonons, $phi^4$ chains exhibit Fourier heat conduction. In his recent Snook-Prize work Aoki also showed that the model can exhibit chaos on the three-dimensional energy surface describing the two-body two-spring chain. That surface can include {it at least two} distinct chaotic seas. Aoki pointed out that the model typically exhibits different kinetic temperatures for the two bodies. Evidently few-body $phi^4$ problems merit more investigation. Accordingly, the 2018 Prizes honoring Ian Snook (1945-2013) will be awarded to the author(s) of the most interesting work analyzing and discussing few-body $phi^4$ models from the standpoints of dynamical systems theory and macroscopic thermodynamics, taking into account the model's ability to maintain a steady-state kinetic temperature gradient as well as at least two coexisting chaotic seas in the presence of deterministic chaos.
{"title":"The φ4 Model, Chaos, Thermodynamics, and the 2018 SNOOK Prizes in Computational Statistical Mechanics","authors":"W. Hoover, C. G. Hoover","doi":"10.12921/cmst.2018.0000032","DOIUrl":"https://doi.org/10.12921/cmst.2018.0000032","url":null,"abstract":"The one-dimensional $phi^4$ Model generalizes a harmonic chain with nearest-neighbor Hooke's-Law interactions by adding quartic potentials tethering each particle to its lattice site. In their studies of this model Kenichiro Aoki and Dimitri Kusnezov emphasized its most interesting feature : because the quartic tethers act to scatter long-wavelength phonons, $phi^4$ chains exhibit Fourier heat conduction. In his recent Snook-Prize work Aoki also showed that the model can exhibit chaos on the three-dimensional energy surface describing the two-body two-spring chain. That surface can include {it at least two} distinct chaotic seas. Aoki pointed out that the model typically exhibits different kinetic temperatures for the two bodies. Evidently few-body $phi^4$ problems merit more investigation. Accordingly, the 2018 Prizes honoring Ian Snook (1945-2013) will be awarded to the author(s) of the most interesting work analyzing and discussing few-body $phi^4$ models from the standpoints of dynamical systems theory and macroscopic thermodynamics, taking into account the model's ability to maintain a steady-state kinetic temperature gradient as well as at least two coexisting chaotic seas in the presence of deterministic chaos.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"162 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86324495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-31DOI: 10.12921/CMST.2018.0000005
Witold Kieraś, Ł. Kobyliński, Maciej Ogrodniczuk
The paper presents Korpusomat, a web application aimed at building annotated corpora for the purpose of corpus linguistic studies. Korpusomat combines existing tools, such as morphological analyser, tagger and corpus search engine, and provides an easy-to-use environment for building corpora technically compatible with the National Corpus of Polish from almost any text, including texts in binary formats. In the paper we present the current state of the project, its features and functionalities, as well as some future plans and developments tasks. A usage example is also presented.
{"title":"Korpusomat – a Tool for Creating Searchable Morphosyntactically Tagged Corpora","authors":"Witold Kieraś, Ł. Kobyliński, Maciej Ogrodniczuk","doi":"10.12921/CMST.2018.0000005","DOIUrl":"https://doi.org/10.12921/CMST.2018.0000005","url":null,"abstract":"The paper presents Korpusomat, a web application aimed at building annotated corpora for the purpose of corpus linguistic studies. Korpusomat combines existing tools, such as morphological analyser, tagger and corpus search engine, and provides an easy-to-use environment for building corpora technically compatible with the National Corpus of Polish from almost any text, including texts in binary formats. In the paper we present the current state of the project, its features and functionalities, as well as some future plans and developments tasks. A usage example is also presented.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"167 1","pages":"21-27"},"PeriodicalIF":0.0,"publicationDate":"2018-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80532897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-31DOI: 10.12921/CMST.2018.0000004
Daniel Dzienisiewicz, Łukasz Borchmann, Piotr Wierzchoń, F. Gralinski
The article discusses selected projects from the field of digital humanities realised by the Re-research.pl group. The group consists of researchers from the Institute of Linguistics and the Department of Natural Language Processing at Adam Mickiewicz University, Poznań, Poland. The projects discussed include National Photocorpus of Polish, Discovermat, Korea, Koreans and ‘Koreanity’ in the digitised Polish press of the 20 century, Biography of the Nation, 100,000 ministories, Gonito.net and 50,000 words. Domain and chronologisation index. However, the main focus of the article is the interdisciplinary popular-scientific blog Re-research.pl. The daily blog posts include texts on a variety of subjects, ranging from linguistics, history and folklore to computer science. Selected posts and categories of posts are discussed, such as chronologisational challenges, texts devoted to folklore and materials on the structure of text files. Apart from providing daily analyses, the blog promotes other projects and serves as a dialogue platform for representatives of various fields.
{"title":"Re-research.pl: where Humanities Meet Computer Science","authors":"Daniel Dzienisiewicz, Łukasz Borchmann, Piotr Wierzchoń, F. Gralinski","doi":"10.12921/CMST.2018.0000004","DOIUrl":"https://doi.org/10.12921/CMST.2018.0000004","url":null,"abstract":"The article discusses selected projects from the field of digital humanities realised by the Re-research.pl group. The group consists of researchers from the Institute of Linguistics and the Department of Natural Language Processing at Adam Mickiewicz University, Poznań, Poland. The projects discussed include National Photocorpus of Polish, Discovermat, Korea, Koreans and ‘Koreanity’ in the digitised Polish press of the 20 century, Biography of the Nation, 100,000 ministories, Gonito.net and 50,000 words. Domain and chronologisation index. However, the main focus of the article is the interdisciplinary popular-scientific blog Re-research.pl. The daily blog posts include texts on a variety of subjects, ranging from linguistics, history and folklore to computer science. Selected posts and categories of posts are discussed, such as chronologisational challenges, texts devoted to folklore and materials on the structure of text files. Apart from providing daily analyses, the blog promotes other projects and serves as a dialogue platform for representatives of various fields.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"9 1","pages":"7-19"},"PeriodicalIF":0.0,"publicationDate":"2018-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89472049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-31DOI: 10.12921/CMST.2018.0000007
Maciej Piasecki, T. Walkowiak, Maciej Eder
The paper presents an open, web-based system for stylometric analysis named WebSty, which is a part of the CLARIN-PL research infrastructure. WebSty does not require local installation by users, can be used via any web browser, offers rich set-up, and runs on a computing cluster. We discuss the underlying ideas of the system, its architecture, a pipeline of language tools for processing Polish, and its integration with systems for clustering, visualizing the results of clustering, and identifying the features of the strongest discrimination power. The techniques used for feature weighting and text similarity measuring are also concisely overviewed. In conclusions, we present preliminary evaluation of WebSty on the corpus of 1000 literary works, and we report on the results of the first research applications of WebSty. Even if the system was initially focused on processing Polish texts, we also briefly discuss its development towards a multilingual system, which already supports English, German and Hungarian.
{"title":"Open Stylometric System WebSty : Integrated Language Processing, Analysis and Visualisation","authors":"Maciej Piasecki, T. Walkowiak, Maciej Eder","doi":"10.12921/CMST.2018.0000007","DOIUrl":"https://doi.org/10.12921/CMST.2018.0000007","url":null,"abstract":"The paper presents an open, web-based system for stylometric analysis named WebSty, which is a part of the CLARIN-PL research infrastructure. WebSty does not require local installation by users, can be used via any web browser, offers rich set-up, and runs on a computing cluster. We discuss the underlying ideas of the system, its architecture, a pipeline of language tools for processing Polish, and its integration with systems for clustering, visualizing the results of clustering, and identifying the features of the strongest discrimination power. The techniques used for feature weighting and text similarity measuring are also concisely overviewed. In conclusions, we present preliminary evaluation of WebSty on the corpus of 1000 literary works, and we report on the results of the first research applications of WebSty. Even if the system was initially focused on processing Polish texts, we also briefly discuss its development towards a multilingual system, which already supports English, German and Hungarian.","PeriodicalId":10561,"journal":{"name":"computational methods in science and technology","volume":"6 12","pages":"43-58"},"PeriodicalIF":0.0,"publicationDate":"2018-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91490413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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