Nauki Techniczne

Bulletin of the Polish Academy of Sciences Technical Sciences

Zawartość

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 4

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Bibliografia

  1.  Ł. Czekierda, F. Malawski, R. Straś, K. Zieliński, and S. Zieliński, “Leveraging cloud environment flexibility to smoothen the transition to remote teaching during covid-19 pandemic – a case study,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137934, 2021, doi: 10.24425/ bpasts.2021.137934.
  2.  A. Gryszczyńska, “The impact of the covid-19 pandemic on cybercrime,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137933, 2021, doi: 10.24425/bpasts.2021.137933.
  3.  W. Jamroga, D. Mestel, P. Roenne, P. Ryan, and M. Skrobot, “A survey of requirements for covid-19 mitigation strategies,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137724, 2021, doi: 10.24425/bpasts.2021.137724.
  4.  M. Gruda and M. Kędziora, “Analyzing and improving tools for supporting fighting against covid-19 based on prediction models and contact tracing,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137414, 2021, doi: 10.24425/bpasts.2021.137414.
  5.  A. Bobowski, J. Cichoń, and M. Kutyłowski, “Extensions for apple-google exposure notification mechanism,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137126, 2021, doi: 10.24425/bpasts.2021.137126.
  6.  M. Kozielski et al., “Enhancement of covid-19 symptom-based screening with quality-based classifier optimisation,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137349, 2021, doi: 10.24425/bpasts.2021.137349.
  7.  M. Paciorek, D. Poklewski-Koziełł, K. Racoń-Leja, A. Byrski, M. Gyurkovich, and W. Turek, “Microscopic simulation of pedestrian traffic in urban environment under epidemic conditions,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137725, 2021, doi: 10.24425/ bpasts.2021.137725.
  8.  M. Łoś, M. Woźniak, I. Muga, and M. Paszyński, “Threedimensional simulations of the airborne covid-19 pathogens using the advection- diffusion model and alternating-directions implicit solver,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 4, p. e137125, 2021, doi: 10.24425/ bpasts.2021.137125.
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Autorzy i Afiliacje

Aneta Afelt
1
Aleksander Byrski
2
ORCID: ORCID
Victor Calo
3
Tyll Krüger
4
Lech Madeyski
4
ORCID: ORCID
Wojciech Penczek
5

  1. Institut de Recherche pour le Développement, Montpellier, France
  2. AGH University of Science and Technology, Krakow, Poland
  3. Curtin University, Perth, Australia
  4. Wroclaw University of Science and Technology, Wroclaw, Poland
  5. Institute of Computer Science, PAS, Warsaw, Poland
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Abstrakt

Cloud-based computational environments can offer elastic and flexible services to wide audiences. Małopolska Educational Cloud was originally developed to support the day-to-day collaboration of geographically scattered schools with universities which organized online classes, led by university teachers, as an amendment to face-to-face teaching. Due to the centralized management and ubiquitous access, both the set of services provided by MEC and their usage patterns can be adjusted rapidly. In this paper we show how – during the COVID-19 pandemic – the flexibility of Małopolska Educational Cloud was leveraged to speed up the transition from in-class to remote teaching, both in the classes and schools which were already involved in the MEC project, and newly added ones. We also discuss the actions that were required to support the smooth transition and draw conclusions for the future.
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Bibliografia

  1.  K. Zieliński, Ł. Czekierda, F. Malawski, R. Straś, and S. Zieliński, “Recognizing value of educational collaboration between high schools and universities facilitated by modern ICT,” J. Comput. Assisted Learn., vol. 33, no. 6, pp. 633–648, 2017.
  2.  Ł. Czekierda, K. Zieliński, and S. Zieliński, “Automated orchestration of online educational collaboration in cloud-based environments,” ACM Trans. Multimedia Comput. Commun. Appl., vol. 17, no. 1, pp. 1–26, 2021.
  3.  “WHO coronavirus disease (COVID-19) pandemic,” https://www.who.int/emergencies/diseases/novel-coronavirus-2019, accessed: 2020-12- 30.
  4.  N. Fernandes, “Economic effects of coronavirus outbreak (COVID-19) on the world economy,” IESE Business School Working Paper No. WP-1240-E, 2020, doi: 10.2139/ssrn.3557504.
  5.  V. Venkatesh, “Impacts of COVID-19: A research agenda to support people in their fight,” Int. J. Inf. Manage., vol. 55, p. 102197, 2020.
  6.  A. Tubadji, F. Boy, and D.J. Webber, “Narrative economics, public policy and mental health,” Covid Econ., vol. 20, pp. 109–131, 2020.
  7.  “UNESCO COVID-19 impact on education,” https://en.unesco.org/covid19/educationresponse, accessed: 2020-12-30.
  8.  G. Vial, “Understanding digital transformation: A review and a research agenda,” J. Strategic Inf. Syst., vol. 28, no. 2, pp. 118–144, 2019.
  9.  Y.K. Dwivedi, D.L. Hughes, C. Coombs, I. Constantiou, Y. Duan, J.S. Edwards et al., “Impact of COVID-19 pandemic on information management research and practice: Transforming education, work and life,” Int. J. Inf. Manage., vol. 55, p. 102211, 2020.
  10.  T.D. Oyedotun, “Sudden change of pedagogy in education driven by COVID-19: Perspectives and evaluation from a developing country,” Res. Globalization, vol. 2, p. 100029, 2020.
  11.  M. Assunção Flores and M. Gago, “Teacher education in times of COVID-19 pandemic in Portugal: national, institutional and pedagogical responses,” J. Educ. Teach., vol. 46, no. 4, pp. 507–516, 2020.
  12.  N. Iivari, S. Sharma, and L. Ventä-Olkkonen, “Digital transformation of everyday life–how COVID-19 pandemic transformed the basic education of the young generation and why information management research should care?” Int. J. Inf. Manage., vol. 55, p. 102183, 2020.
  13.  L. Mishra, T. Gupta, and A. Shree, “Online teachinglearning in higher education during lockdown period of COVID-19 pandemic,” Int. J. Educ. Res. Open, vol. 1, p. 100012, 2020.
  14.  A. Qazi, et al., “Conventional to online education during COVID-19 pandemic: Do develop and underdeveloped nations cope alike,” Child. Youth Serv. Rev., vol. 119, p. 105582, 2020.
  15.  I. Asanov, F. Flores, D. McKenzie, M. Mensmann, and M. Schulte, “Remote-learning, time-use, and mental health of Ecuadorian high- school students during the COVID-19 quarantine,” World Dev., vol. 138, p. 105225, 2021.
  16.  M. Adnan and K. Anwar, “Online learning amid the COVID-19 pandemic: Students’ perspectives,” J. Pedagogic. Sociol. Psychol., vol. 2, no. 1, pp. 45–51, 2020.
  17.  C.M. Toquero, “Challenges and opportunities for higher education amid the COVID-19 pandemic: The Philippine context,” Pedag. Res., vol. 5, no. 4, 2020.
  18.  K.H. Mok, W. Xiong, G. Ke, and J.O.W. Cheung, “Impact of COVID-19 pandemic on international higher education and student mobility: Student perspectives from mainland China and Hong Kong,” Int. J. Educ. Res., vol. 105, p. 101718, 2021.
  19.  S.P. Becker, R. Breaux, C.N. Cusick, M.R. Dvorsky, N.P. Marsh, E. Sciberras, and J.M. Langberg, “Remote learning during COVID-19: Examining school practices, service continuation, and difficulties for adolescents with and without attention-deficit/hyperactivity disorder,” J. Adolesc. Health, vol. 67, no. 6, pp. 769–777, 2020.
  20.  M. Kogan, S.E. Klein, C.P. Hannon, and M.T. Nolte, “Orthopaedic education during the COVID-19 pandemic,” J. Am. Acad. Orthop. Surg., vol. 28, no. 11, pp. e456–e464, 2020.
  21.  V.A. Jones, K.A. Clark, C. Puyana, and M.M. Tsoukas, “Rescuing medical education in times of COVID-19,” Clin. Dermatol., vol. 39, no. 1, pp. 33–40, 2021.
  22.  N. Carroll and K. Conboy, “Normalising the “new normal”: Changing tech-driven work practices under pandemic time pressure,” Int. J. Inf. Manage., vol. 55, p. 102186, 2020.
  23.  W. Ali, “Online and remote learning in higher education institutes: A necessity in light of COVID-19 pandemic,” High. Educ. Stud., vol. 10, no. 3, 2020.
  24.  F.M. Reimers and A. Schleicher, “A framework to guide an education response to the COVID-19 pandemic of 2020,” OECD. Retrieved April, vol. 14, no. 2020, pp. 2020–04, 2020.
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Autorzy i Afiliacje

Łukasz Czekierda
1
Filip Malawski
1
Robert Straś
1
Krzysztof Zieliński
1
ORCID: ORCID
Sławomir Zieliński
1

  1. AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland
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Abstrakt

The COVID-19 pandemic is accompanied by a cyber pandemic, involving changes in the modi operandi of perpetrators of various crimes, and an infodemic, associated with the spread of disinformation. The article analyses the impact of the COVID-19 pandemic on cybercrime and presents the latest research on the number of cybercrime cases in Poland and their growth dynamics. It determines the factors that contribute to the commission of a crime and prevent easy identification of criminals. It also suggests the legal and organisational changes that could reduce the number and effects of the most frequently recorded cyberattacks at a time of COVID-19. Particular attention is paid to legal problems of the growing phenomenon of identity theft, and the need to ensure better protection of users from phishing, including through education and proactive security measures consisting in blocking Internet domains used for fraudulent attempts to obtain data and financial resources.
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Bibliografia

  1.  “Agari H2 2020 Email Fraud Report”. [Online]. Available: https://www.agari.com/cyber-intelligence-research/e-books/agari-h2-2020-email- fraud-report.pdf [Accessed: 15-Jun-2021].
  2.  “IC3 Internet Crime Report 2019”, p. 9. [Online]. Available: https://www.ic3.gov/Media/PDF/AnnualReport/2019_IC3Report.pdf [Accessed: 15-Jun-2021].
  3.  “Internet Organised Crime Threat Assessment (IOCTA) 2020” [Online]. Available: https://www.europol.europa.eu/activities-services/ main-reports/internet-organised-crime-threat-assessment-iocta-2020 [Accessed: 15-Jun-2021], hereinafter as: IOCTA 2020.
  4.  “How COVID-19-related crime infected Europe during 2020” [Online]. Available: https://www.europol.europa.eu/publications-documents/ how-covid-19-related-crime-infected-europe-during-2020 [Accessed: 15-Jun-2021].
  5.  Rise of fake ‘corona cures’ revealed in global counterfeit medicine operation. [Online]. Available: https://www.europol.europa.eu/newsroom/ news/rise-of-fake-%E2%80%98corona-cures%E2%80 %99-revealed-in-global-counterfeit-medicine-operation [Accessed: 15-Jun-2021].
  6.  Warnings about fake online shops are published on consumer or cybersecurity websites. Sample fake online shop search engine: “Suspicious online shops!” [Online]. Available: https://www.legalniewsieci.pl/aktualnosci/podejrzane-sklepy-internetowe [Accessed: 15-Jun-2021], [in Polish].
  7.  Criminal Code of June 6, 1997 (Journal of Laws of 2020, item 1444, as amended), hereinafter CC.
  8.  Already on 16 March 2020, criminals created a fraudulent fundraiser in Poland at https://pomoc.siepomaga.net/koronawirus?SS52.
  9.  “Annual Report on the Activities of CERT Poland. Security Landscape of the Polish Internet”, 2018, pp. 59–67. [Online]. Available: https:// www.cert.pl/uploads/docs/Raport_CP_2018.pdf [Accessed: 15-Jun-2021], [in Polish].
  10.  In connection with the discovered insufficient implementation of technical and organisational measures to secure customer data, by a decision of 10 September 2019, Morele.net Sp. z o.o. was charged with an administrative fine of PLN 2.8 million (Decision of President of the Personal Data Protection Office of 10 September 2019, no. ZSPR.421.2.2019, subsequently upheld by a judgement of the Provincial Administrative Court in Warsaw of 3 September 2020, no. II SA/Wa 2559/19, [in Polish].
  11.  Regulation of the Minister of National Education of 11 March 2020 on the temporary restriction of the functioning of educational facilities in relation to preventing, counteracting and combating COVID- 19 (Journal of Laws item 410 as amended), [in Polish].
  12.  Government’s bill to amend the Law on special solutions to prevent, counteract and combat COVID-1  9, other communicable diseases and the resultant crises, and to amend certain other laws, form no. 299 of 26 March 2020. [Online]. Available: http://sejm.gov.pl/Sejm9. nsf/druk.xsp?nr=299 [in Polish].
  13.  A. Gryszczyńska, “The use of COVID- 19 in scenarios of social engineering attacks”, Maritime Security Yearbook, 2021, pp. 137‒161, [Online]. Available: https://wdiom.amw.gdynia.pl/wp-content/uploads/2021/06/PT2020v0.13.pdf [in Polish].
  14.  M.S. Islam et al., “COVID- 19-Related Infodemic and Its Impact on Public Health: A Global Social Media Analysis”, Am. J. Trop. Med. Hyg. 103(4), 1621–1629, (2020), doi: 10.4269/ajtmh.20-0812.
  15.  J. Tidy, “Dr Reddy’s: Covid vaccine-maker suffers cyber-attack”, BBC, Oct. 22, 2020 [Online]. Available: https://www.bbc.com/news/ technology-54642870 [Accessed: 15-Jun-2021].
  16.  “Advisory: APT29 targets COVID- 19 vaccine development”. [Online]. Available: https://www.ncsc.gov.uk/files/Advisory-APT29-targets- COVID-19-vaccine-development.pdf [Accessed: 15-Jun-2021].
  17.  BBC News, “Pfizer/BioNTech vaccine docs hacked from European Medicines Agency”, BBC, Dec. 09, 2020 [Online]. Available: https:// www.bbc.com/news/technology-55249353 [Accessed: 15-Jun-2021].
  18.  “Pandemic profiteering: how criminals exploit the COVID- 19 crisis”. [Online]. Available: https://www.europol.europa.eu/publications- documents/pandemic-profiteering-how-criminals-exploit-covid-19-crisis [Accessed: 15-Jun-2021].
  19.  Wired, Sep. 19, 2020 [Online]. Available: https://www.wired.com/story/a-patient-dies-after-a-ransomware-attack-hits-a-hospital [Accessed: 15-Jun-2021].
  20.  “Annual Report on the Activities of CERT Poland. Security Landscape of the Polish Internet”, 2019. [Online]. Available: https://www. cert.pl/uploads/docs/Raport_CP_2019.pdf [Accessed: 15-Jun-2021], [in Polish].
  21.  “Report on the state of Poland’s cybersecurity in 2019”. [Online]. Available: https://csirt.gov.pl/cer/publikacje/raporty-o-stanie- bezpi/969,Raport-o-stanie-bezpieczenstwa-cyberprzestrzeni-RP-w-2019-roku.html [Accessed: 15-Jun-2021], [in Polish].
  22.  A. Pérez-Escoda, C. Jiménez-Narros, M. Perlado-Lamo-de-Espinosa, and L. Miguel Pedrero-Esteban, “Social Networks Engagement During the COVID-1  9 Pandemic in Spain: Health Media vs. Healthcare Professionals”, Int. J. Environ. Res. Public Health 17(14), (2020), doi: 10.3390/ijerph17145261.
  23.  GWI Coronavirus Research, March 2020 Series 2: Travel & Commuting, GWI Connecting the dots 2021; The biggest COVID- 19 trends that are here to stay. [Online]. Available: https://www.globalwebindex.com [Accessed: 15-Jun-2021].
  24.  “Information society in Poland in 2020”, Central Statistical Office, [Online]. Available: https://stat.gov.pl/obszary-tematyczne/nauka-i- technika-spoleczenstwo-informacyjne/spoleczenstwo-informacyjne/spoleczenstwo-informacyjne-w-polsce-w-2020 -roku,1,14.html [Accessed: 15-Jun-2021], [in Polish].
  25.  “IOCTA 2020”, pp. 6‒7, 13‒17 (2020). [Online]. Available: https://www.europol.europa.eu/sites/default/files/documents/internet_organised_ crime_threat_assessment_iocta_2020.pdf.
  26.  For example in 2013 the Silk Road has been seized: “Ross Ulbricht, the Creator and Owner of the Silk Road Website, Found Guilty in Manhattan Federal Court on All Counts — FBI”. [Online]. Available: https://www.fbi.gov/contact-us/field-offices/newyork/news/press- releases/ross-ulbricht-the-creator-and-owner-of-the-silk-road-website-found-guilty-in-manhattan-federal-court-on-all-counts [Accessed: 15-Jun-2021].
  27.  “Cybercriminals’ favourite VPN taken down in global action”. [Online]. Available: https://www.europol.europa.eu/newsroom/news/ cybercriminals%E2%80%99-favourite-vpn-taken-down-in-global-action [Accessed: 15-Jun-2021].
  28.  “21 arrests in nationwide cyber crackdown”. [Online]. Available: https://www.yorkpress.co.uk/news/18970445.21-arrests-nationwide- crackdown-website-selling-stolen-personal-data/ [Accessed: 15-Jun-2021].
  29.  Recommendation for a Council Decision authorising the opening of negotiations in view of an agreement between the European Union and the United States of America on cross-border access to electronic evidence for judicial cooperation in criminal matters, COM/2019/70 final.
  30.  Proposal for a Regulation of the European Parliament and of the Council on European Production and Preservation Orders for electronic evidence in criminal matters, COM/2018/225 final – 2018/0108 (COD).
  31.  Proposal for a Directive of the European Parliament and of the Council laying down harmonised rules on the appointment of legal representatives for the purpose of gathering evidence in criminal proceedings, COM/2018/226 final – 2018/0107 (COD).
  32.  A. Gryszczyńska, “Acquisition and analysis of data on cybersecurity incidents”, Internet. Data analyst, G. Szpor, Ed., C.H. Beck, Warsaw, 2019, pp. 296‒313, [in Polish].
  33.  “Information society in Poland in 2020”, p. 156, [in Polish].
  34.  “Comparative study on filtering, blocking and take-down of illegal content on the Internet”, Swiss Institute of Comparative Law, 2015, [Online]. Available: https://edoc.coe.int/en/internet/7289-pdf-comparative-study-on-blocking-filtering-and-take-down-of-illegal-internet- content-.html [Accessed: 15-Jun-2021].
  35.  Law of 24 May 2002 on the Internal Security Agency and the Intelligence Agency (Journal of Laws of 2020 item 27 as amended), [in Polish].
  36.  Law of 19 November 2009 on Gambling (Journal of Laws of 2020 item 2094), [in Polish].
  37.  P. Dęba, “Multi-vector protection of Internet users as illustrated by the Orange Cyber Shield”, presented at the 12th Scientific Conference Security in the Internet – Cyber Pandemic, UKSW, Warsaw, Oct. 22‒23, 2020, [in Polish].
  38.  Index of domains. [Online]. Available: https://hole.cert.pl/domains/ [Accessed: 15-Jun-2021].
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Autorzy i Afiliacje

Agnieszka Gryszczyńska
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Abstrakt

The COVID-19 pandemic has influenced virtually all aspects of our lives. Across the world, countries have applied various mitigation strategies, based on social, political, and technological instruments. We postulate that multi-agent systems can provide a common platform to study (and balance) their essential properties. We also show how to obtain a comprehensive list of the properties by “distilling” them from media snippets. Finally, we present a preliminary take on their formal specification, using ideas from multi-agent logics.
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Bibliografia

  1.  A. Soltani, R. Calo, and C. Bergstrom, “Contacttracing apps are not a solution to the COVID-19 crisis,” Brookings Tech Stream, 27 April 2020. [Online]. Available: https://www.brookings.edu/techstream/inaccurate-and-insecure-why-contact-tracing-apps-could-be-a-disaster/.
  2.  J. Morley, J. Cowls, M. Taddeo, and L. Floridi, “Ethical guidelines for COVID-19 tracing apps,” Nat. Comment, pp. 29–31, 4 June 2020. [Online]. Available: https://www.nature.com/articles/d41586-020-01578-0.
  3.  A. Stollmeyer, M. Schaake, and F. Dignum, “The Dutch tracing app ’soap opera’ – lessons for Europe,” euobserver, 7 May 2020. [Online]. Available: https://euobserver.com/opinion/148265.
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  5.  Y. Shoham and K. Leyton-Brown, Multiagent Systems – Algorithmic, Game-Theoretic, and Logical Foundations. Cambridge University Press, 2009.
  6.  A. Rao and M. Georgeff, “Modeling rational agents within a BDI-architecture,” in Proceedings of KR, 1991, pp. 473–484.
  7.  M.Wooldridge, Reasoning about Rational Agents. MIT Press : Cambridge, Mass, 2000.
  8.  M. Dastani, K. Hindriks, and J. Meyer, Eds., Specification and Verification of Multi-Agent Systems. Springer, 2010.
  9.  W. Jamroga, Logical Methods for Specification and Verification of Multi-Agent Systems. ICS PAS, 2015.
  10.  W. Jamroga, D. Mestel, P.B. Rønne, P.Y.A. Ryan, and M. Skrobot, “A survey of requirements for COVID-19 mitigation strategies. Part I: newspaper clips,” CoRR, vol. abs/2011.07887, 2020.
  11.  A. Lomuscio, H. Qu, and F. Raimondi, “MCMAS: An open-source model checker for the verification of multiagent systems,” Int. J. Software Tools Technol. Trans., vol. 19, no. 1, pp. 9–30, 2017.
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  13.  G. Kant, A. Laarman, J. Meijer, J. van de Pol, S. Blom, and T. van Dijk, “LTSmin: High-performance languageindependent model checking,” in Proceedings of TACAS, ser. Lecture Notes in Computer Science, vol. 9035. Springer, 2015, pp. 692–707.
  14.  D. Kurpiewski, W. Jamroga, and M. Knapik, “STV: Model checking for strategies under imperfect information,” in Proceedings of AAMAS. IFAAMAS, 2019, pp. 2372–2374.
  15.  S. Woodhams, “COVID-19 digital rights tracker,” Top10VPN, 10 June 2020. [Online]. Available: https://www.top10vpn.com/research/ covid-19-digital-rights-tracker/.
  16.  AFP, “Major finding: Lockdowns averted 3 million deaths in 11 European nations: study,” RTL Today, 9 June 2020. [Online]. Available: https://today.rtl.lu/news/science-and-environment/a/ 1530963.html.
  17.  I. Ilves, “Why are Google and Apple dictating how European democracies fight coronavirus?” The Guardian, 16 June 2020. [Online]. Available: https://www.theguardian.com/commentisfree/2020/jun/16/google-apple-dictating-european-democracies-coronavirus.
  18.  “NHS COVID-19: the new contact-tracing app from the NHS,” NCSC, 14 May 2020. [Online]. Available: https://www.ncsc.gov.uk/ information/nhs-covid-19-app-explainer.
  19.  J. Steinhauer and A. Goodnough, “Contact tracing is failing in many states. Here’s why.” New York Times, 5 October 2020. [Online]. Available: https://www.nytimes.com/2020/07/31/health/covid-contact-tracing-tests.html.
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Autorzy i Afiliacje

Wojciech Jamroga
1 2
David Mestel
1
Peter B. Roenne
1
Peter Y.A. Ryan
1
Marjan Skrobot
1

  1. Interdisciplinary Centre on Security, Reliability and Trust, SnT, University of Luxembourg
  2. Institute of Computer Science, Polish Academy of Sciences, ul. Jana Kazimierza 5, 01-248 Warsaw, Poland
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Abstrakt

In the paper, we are analyzing and proposing an improvement to current tools and solutions for supporting fighting with COVID-19. We analyzed the most popular anti-covid tools and COVID prediction models. We addressed issues of secure data collection, prediction accuracy based on COVID models. What is most important, we proposed a solution for improving the prediction and contract tracing element in these applications. The proof of concept solution to support the fight against a global pandemic is presented, and the future possibilities for its development are discussed.
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Bibliografia

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Autorzy i Afiliacje

Martyna Gruda
1
Michal Kedziora
1

  1. Wroclaw University of Science and Technology, ul. Wybrzeże Stanisława Wyspiańskiego 27, 50-370 Wroclaw, Poland
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Abstrakt

We analyze the Google-Apple exposure notification mechanism designed by the Apple-Google consortium and deployed on a large number of Corona-warn apps. At the time of designing it, the most important issue was time-to-market and strict compliance with the privacy protection rules of GDPR. This resulted in a plain but elegant scheme with a high level of privacy protection. In this paper we go into details and propose some extensions of the original design addressing practical issues. Firstly, we point to the danger of a malicious cryptographic random number generator (CRNG) and resulting possibility of unrestricted user tracing. We propose an update that enables verification of unlinkability of pseudonymous identifiers directly by the user. Secondly, we show how to solve the problem of verifying the “same household” situation justifying exempts from distancing rules. We present a solution with MIN-sketches based on rolling proximity identifiers from the Apple-Google scheme. Thirdly, we examine the strategies for revealing temporary exposure keys. We have detected some unexpected phenomena regarding the number of keys for unbalanced binary trees of a small size. These observations may be used in case that the size of the lists of diagnosis keys has to be optimized.
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Bibliografia

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Autorzy i Afiliacje

Adam Bobowski
1
Jacek Cichoń
1
ORCID: ORCID
Mirosław Kutyłowski
1
ORCID: ORCID

  1. Wrocław University of Science and Technology, Wybrzeże Stanisława Wyspiańskiego 27, 50-370 Wrocław, Poland
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Abstrakt

Efforts of the scientific community led to the development of multiple screening approaches for COVID-19 that rely on machine learning methods. However, there is a lack of works showing how to tune the classification models used for such a task and what the tuning effect is in terms of various classification quality measures. Understanding the impact of classifier tuning on the results obtained will allow the users to apply the provided tools consciously. Therefore, using a given screening test they will be able to choose the threshold value characterising the classifier that gives, for example, an acceptable balance between sensitivity and specificity. The presented work introduces the optimisation approach and the resulting classifiers obtained for various quality threshold assumptions. As a result of the research, an online service was created that makes the obtained models available and enables the verification of various solutions for different threshold values on new data.
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Bibliografia

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Autorzy i Afiliacje

Michał Kozielski
1
ORCID: ORCID
Joanna Henzel
1
ORCID: ORCID
Joanna Tobiasz
2
ORCID: ORCID
Aleksandra Gruca
1
Paweł Foszner
3
ORCID: ORCID
Joanna Zyla
2
ORCID: ORCID
Małgorzata Bach
4
Aleksandra Werner
4
ORCID: ORCID
Jerzy Jaroszewicz
5
Joanna Polańska
2
ORCID: ORCID
Marek Sikora
1
ORCID: ORCID

  1. Department of Computer Networks and Systems, Silesian University of Technology, Gliwice, Poland
  2. Department of Data Science and Engineering, Silesian University of Technology, Gliwice, Poland
  3. Department of Graphics, Computer Vision and Digital Systems, Silesian University of Technology, Gliwice, Poland
  4. Department of Applied Informatics, Silesian University of Technology, Gliwice, Poland
  5. Department of Infectious Diseases and Hepatology, Medical University of Silesia, Katowice, Poland
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Abstrakt

The ongoing period of the pandemic makes everybody focused on the matters related to fighting this immense problem posed to the societies worldwide. The governments deal with the threat by publishing regulations which should allow to mitigate the pandemic, walking on thin ice as the decision makers do not always know how to properly respond to the threat in order to save people. Computer-based simulations of e.g. parts of the city or rural area should provide significant help, however, there are some requirements to fulfill. The simulation should be verifiable, supported by the urban research and it should be possible to run it in appropriate scale. Thus in this paper we present an interdisciplinary work of urban researchers and computer scientists, proposing a scalable, HPC-grade model of simulation, which was tested in a real scenario and may be further used to extend our knowledge about epidemic spread and the results of its counteracting methods. The paper shows the relevant state of the art, discusses the micro-scale simulation model, sketches out the elements of its implementation and provides tangible results gathered for a part of the city of Krakow, Poland.
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Bibliografia

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Autorzy i Afiliacje

Mateusz Paciorek
1
ORCID: ORCID
Damian Poklewski-Koziełł
2
ORCID: ORCID
Kinga Racoń-Leja
2
ORCID: ORCID
Aleksander Byrski
1
ORCID: ORCID
Mateusz Gyurkovich
2
ORCID: ORCID
Wojciech Turek
1
ORCID: ORCID

  1. AGH University of Science and Technology, al. Adama Mickiewicza 30, 30-059 Krakow, Poland
  2. Cracow University of Technology, ul. Warszawska 24, 31-155 Krakow, Poland
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Abstrakt

In times of the COVID-19, reliable tools to simulate the airborne pathogens causing the infection are extremely important to enable the testing of various preventive methods. Advection-diffusion simulations can model the propagation of pathogens in the air. We can represent the concentration of pathogens in the air by “contamination” propagating from the source, by the mechanisms of advection (representing air movement) and diffusion (representing the spontaneous propagation of pathogen particles in the air). The three-dimensional time-dependent advection-diffusion equation is difficult to simulate due to the high computational cost and instabilities of the numerical methods. In this paper, we present alternating directions implicit isogeometric analysis simulations of the three-dimensional advection-diffusion equations. We introduce three intermediate time steps, where in the differential operator, we separate the derivatives concerning particular spatial directions. We provide a mathematical analysis of the numerical stability of the method. We show well-posedness of each time step formulation, under the assumption of a particular time step size. We utilize the tensor products of one-dimensional B-spline basis functions over the three-dimensional cube shape domain for the spatial discretization. The alternating direction solver is implemented in C++ and parallelized using the GALOIS framework for multi-core processors. We run the simulations within 120 minutes on a laptop equipped with i7 6700 Q processor 2.6 GHz (8 cores with HT) and 16 GB of RAM.
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Bibliografia

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Autorzy i Afiliacje

Marcin Łoś
1
ORCID: ORCID
Maciej Woźniak
1
ORCID: ORCID
Ignacio Muga
2
ORCID: ORCID
Maciej Paszynski
1
ORCID: ORCID

  1. AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, al. Mickiewicza 30, 30-059 Krakow, Poland
  2. Instituto de Matemáticas, Pontificia Universidad Católica de Valparaíso, Chile
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Abstrakt

Hybridization of meta-heuristic algorithms plays a major role in the optimization problem. In this paper, a new hybrid meta-heuristic algorithm called hybrid pathfinder algorithm (HPFA) is proposed to solve the optimal reactive power dispatch (ORPD) problem. The superiority of the Differential Evolution (DE) algorithm is the fast convergence speed, a mutation operator in the DE algorithm incorporates into the pathfinder algorithm (PFA). The main objective of this research is to minimize the real power losses and subject to equality and inequality constraints. The HPFA is used to find optimal control variables such as generator voltage magnitude, transformer tap settings and capacitor banks. The proposed HPFA is implemented through several simulation cases on the IEEE 118-bus system and IEEE 300-bus power system. Results show the superiority of the proposed algorithm with good quality of optimal solutions over existing optimization techniques, and hence confirm its potential to solve the ORPD problem.
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Bibliografia

  1.  M. Gwozd and L. Ciepliński, “Power supply with parallel reactive and distortion power compensation and tunable inductive filter-part 1”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 68, pp. 401–408, 2020, doi: 10.24425/BPASTS.2020.133383.
  2.  M.N. Acosta, D. Topic, and M.A. Andrade, “Optimal Microgrid–Interactive Reactive Power Management for Day–Ahead Operation”, Energies, vol. 14, no. 5, p. 1275, 2021, doi: 10.3390/en14051275.
  3.  A.M. Tudose, I.I. Picioroaga, D.O. Sidea, and Co. Bulac, “Solving Single- and Multi-Objective Optimal Reactive Power Dispatch Problems Using an Improved Salp Swarm Algorithm”, Energies, vol. 14, no. 5, p. 1222, 2021, doi: 10.3390/en14051222.
  4.  E. Canelas, T. Pinto-Varela, and B. Sawik, “Electricity Portfolio Optimization for Large Consumers: Iberian Electricity Market Case Study”, Energies, vol. 13, no. 9, p. 2249, 2020, doi: 10.3390/en13092249.
  5.  V. Suresh and S.S. Kumar, “Optimal reactive power dispatch for minimization of real power loss using SBDE and DE-strategy algorithm”, J. Ambient Intell. Hum. Comput., 2020, doi: 10.1007/s12652-020-02673-w.
  6.  H. Yapici and N. Cetinkaya, “A new meta-heuristic optimizer: pathfinder algorithm”, Appl. Soft Comput., vol. 78, pp. 545–568, 2019, doi: 10.1016/j.asoc.2019.03.012.
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Autorzy i Afiliacje

V. Suresh
1
S. Senthil Kumar
1

  1. Department of Electrical and Electronics Engineering, Government College of Engineering, Salem-11, India
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Abstrakt

This study offers two Support Vector Machine (SVM) models for fault detection and fault classification, respectively. Different short circuit events were generated using a 154 kV transmission line modeled in MATLAB/Simulink software. Discrete Wavelet Transform (DWT) is performed to the measured single terminal current signals before fault detection stage. Three level wavelet energies obtained for each of three-phase currents were used as input features for the detector. After fault detection, half cycle (10 ms) of three-phase current signals was recorded by 20 kHz sampling rate. The recorded currents signals were used as input parameters for the multi class SVM classifier. The results of the validation tests have demonstrated that a quite reliable, fault detection and classification system can be developed using SVM. Generated faults were used to training and testing of the SVM classifiers. SVM based classification and detection model was fully implemented in MATLAB software. These models were comprehensively tested under different conditions. The effects of the fault impedance, fault inception angle, mother wavelet, and fault location were investigated. Finally, simulation results verify that the offered study can be used for fault detection and classification on the transmission line.
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Bibliografia

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  3.  A. Mukherjee, P.K. Kundu, and A. Das, “Classification and localization of transmission line faults using curve fitting technique with Principal component analysis features,” Electr. Eng., 2021, doi: 10.1007/s00202-021-01285-7.
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Autorzy i Afiliacje

Melih Coban
1 2
ORCID: ORCID
Suleyman S. Tezcan
2
ORCID: ORCID

  1. Bolu Abant Izzet Baysal University, Bolu, Turkey
  2. Gazi University, Ankara, Turkey
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Abstrakt

The paper is the second part of the work, devoted to a DC power supply with a power factor correction function. The power supply is equipped additionally with a shunt active power filter function, which enables the compensation of reactive and distortion power, generated by loads, connected to the same power grid node. A tunable inductive filter, included at the input of the power electronics current source – the main block of the power supply – allows for an improvement of the quality of the system control, compared to the device with a fixed inductive filter. This improvement was possible by extending the current source “frequency response”, which facilitated increasing the dynamics of current changes at the power supply input. The second part of the work briefly reminds the reader of the principle of operation and the structures of both the power supply control system and its power stage. The main purpose of this paper is to present the selected test results of the laboratory model of the electric system with the power supply.
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Bibliografia

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Autorzy i Afiliacje

Michał Gwóźdź
1
ORCID: ORCID
Rafał Wojciechowski
1
ORCID: ORCID
Łukasz Ciepliński
1
ORCID: ORCID

  1. Poznan University of Technology, Faculty of Control, Robotics and Electrical Engineering, Piotrowo 3A, 60-965 Poznan, Poland
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Abstrakt

Elements of the lightning protection system (LPS) often perform additional functions in the facility. Correct and economical design of these elements is possible with the fulfillment of specific requirements, close coordination and inter-branch cooperation. The article draws attention to important aspects of LPS design and highlights the ambiguities that may arise during this process. Firstly, the history of changes in national standardization in the field of lightning protection is approximated. Secondly, the individual components of external LPS are presented. Subsequently, the normative material requirements for earthing are compiled, depending on their function (for lightning protection and protection against electric shock in MV and LV installations). The last part of the paper is devoted to the comparison of the protective angle method and the rolling sphere method. The analysis was made on the example of a simple object for which LPS class I is required. It has been shown that despite the possibility of using both methods, they may result in different solutions. Depending on the choice of method, the difference in the arrangement of the air-termination system is indicated. Examples of generally available LPS solutions are also given, taking account of various materials and assembly technologies.
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Bibliografia

  1.  Ministry of Investment and Development. “Regulation of Minister of Infrastructure of 12 April 2002 regarding technical conditions that shall be met by buildings and their location,” Consolidated text JoL 2019 item 1065, as amended, Apr. 8, 2019.
  2.  Technical Committee No. 55 (PKN/KT 55). “Protection against lightning,” Series of standards PN-EN 62305 – Parts 1–4, 2011/2012.
  3.  E. Musiał, “Foundation and ring earth electrode,” SEP INPE, vol. 143, pp. 3–33, 2011.
  4.  K. Aniserowicz, “Analytical calculations of surges caused by direct lightning strike to underground intrusion detection system,” Bull. Polish Acad. Sci. Tech. Sci., vol. 67, no. 2, pp. 263–269, 2019, doi: 10.24425/bpas.2019.128118.
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Autorzy i Afiliacje

Anna Dąda
1
Paweł Błaut
1
Piotr Miller
2

  1. AGH University of Science and Technology, Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering, al. Mickiewicza 30, 30-059 Krakow, Poland
  2. Lublin University of Technology, Faculty of Electrical Engineering and Computer Science, ul. Nadbystrzycka 38D, 20-618 Lublin, Poland
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Abstrakt

The continuing efforts for reduction of the torque and flux ripples using Finite Set Model Predictive Direct Torque Control methods (FS-MPDTC) have been currently drowning a great attention from the academic communities and industrial applications in the field of electrical drives. The major problem of high torque and flux ripples refers to the consideration of just one active voltage vector at the whole control period. Implementation of two or more voltage vectors at each sampling time has recently been adopted as one of the practical techniques to reduce both the torque and flux ripples. Apart from the calculating challenge of the effort control, the parameter dependency and complexity of the duty ratio relationships lead to reduction of the system robustness. those are two outstanding drawbacks of these methods. In this paper, a finite set of the voltage vectors with a finite set of duty cycles are employed to implement the FS-MPDTC of induction motor. Based on so-called Discrete Duty Cycle- based FS-MPDTC (DDC-FS-MPDTC), a base duty ratio is firstly determined based on the equivalent reference voltage. This duty ratio is certainly calculated using the command values of the control system, while the motor parameters are not used in this algorithm. Then, two sets of duty ratios with limit members are constructed for two adjacent active voltage vectors supposed to apply at each control period. Finally, the prediction and the cost function evaluation are performed for all of the preselected voltage vectors and duty ratios. However, the prediction and the optimization operations are performed for only 12 states of inverter. Meanwhile, time consuming calculations related to SVM has been eliminated. So, the robustness and complexity of the control system have been respectively decreased and increased, and both the flux and torque ripples are reduced in all speed ranges. The simulation results have verified the damping performance of the proposed method to reduce the ripples of both the torque and flux, and accordingly the experimental results have strongly validated the aforementioned statement.
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Bibliografia

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  14.  Y. Zhang, Y. Bai, H. Yang and B. Zhang “Low switching frequency model predictive control of three-level inverter-fed im drives with speed-sensorless and field weakening operations,” IEEE Trans. Ind. Electron., vol. 66, no. 6, pp. 4262–4272, 2019, doi: 10.1109/ TIE.2018.2868014.
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Autorzy i Afiliacje

Babak Kiani
1
Babak Mozafari
1
Soodabeh Soleymani
1
Hosein Mohammadnezhad Shourkaei
1

  1. Department of Electrical Engineering, Science and research Branch, Islamic Azad University, Tehran, IRAN
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Abstrakt

This paper aims to discuss the behavior of the proprietary real-time simulator (RTS) during testing the coordination of distance relay protections in power engineering. During the construction process of the simulator, the mapping of various dynamic phenomena occurring in the modeled part of the power system was considered. The main advantage to the solution is a lower cost of construction while maintaining high values of essential parameters, based on the generally available software environment (MATLAB/Simulink). The obtained results are discussed in detail. This paper is important from the point of view of the cost-effectiveness of design procedures, especially in power systems exploitation and when avoiding faults that result from the selection of protection relay devices, electrical devices, system operations, and optimization of operating conditions. The manuscript thoroughly discusses the hardware configuration and sample results, so that the presented real-time simulator can be reproduced by another researcher.
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Bibliografia

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Autorzy i Afiliacje

Adam Smolarczyk
1
ORCID: ORCID
Sebastian Łapczyński
1
ORCID: ORCID
Michał Szulborski
1
ORCID: ORCID
Łukasz Kolimas
1
ORCID: ORCID
Łukasz Kozarek
2
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Electrical Engineering, Electrical Power Engineering Institute, 00-662 Warsaw, Poland
  2. ILF Consulting Engineers Polska Sp. z o.o., ul. Osmańska 12, 02-823 Warsaw, Poland
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Abstrakt

The cyclicity of the state matrices of positive linear electrical circuits with the chain structure is considered. Two classes of positive linear electrical circuits with the chain structure and cyclic Metzler state matrices are analyzed. Some new properties of these classes of positive electrical circuits are established. The results are extended to fractional linear electrical circuits.
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Bibliografia

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Autorzy i Afiliacje

Tadeusz Kaczorek
1
ORCID: ORCID

  1. Bialystok University of Technology, Faculty of Electrical Engineering, Wiejska 45D, 15-351 Białystok, Poland
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Abstrakt

When patterns to be recognised are described by features of continuous type, discretisation becomes either an optional or necessary step in the initial data pre-processing stage. Characteristics of data, distribution of data points in the input space, can significantly influence the process of transformation from real-valued into nominal attributes, and the resulting performance of classification systems employing them. If data include several separate sets, their discretisation becomes more complex, as varying numbers of intervals and different ranges can be constructed for the same variables. The paper presents research on irregularities in data distribution, observed in the context of discretisation processes. Selected discretisation methods were used and their effect on the performance of decision algorithms, induced in classical rough set approach, was investigated. The studied input space was defined by measurable style-markers, which, exploited as characteristic features, facilitate treating a task of stylometric authorship attribution as classification
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Bibliografia

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  40.  S.G. Weidman and J. O’Sullivan, “The limits of distinctive words: Re-evaluating literature’s gender marker debate,” Digital Scholarsh. Humanit., vol. 33, pp. 374–390, 2018, doi: 10.1093/llc/fqx017.
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Autorzy i Afiliacje

Urszula Stańczyk
1
Beata Zielosko
2

  1. Silesian University of Technology, ul. Akademicka 2A, 44-100 Gliwice, Poland
  2. University of Silesia in Katowice, ul. Będzińska 39, 41-200 Sosnowiec, Poland
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Abstrakt

Time invariant linear operators are the building blocks of signal processing. Weighted circular convolution and signal processing framework in a generalized Fourier domain are introduced by Jorge Martinez. In this paper, we prove that under this new signal processing framework, weighted circular convolution also has a generalized time invariant property. We also give an application of this property to algorithm of continuous wavelet transform (CWT). Specifically, we have previously studied the algorithm of CWT based on generalized Fourier transform with parameter 1. In this paper, we prove that the parameter can take any complex number. Numerical experiments are presented to further demonstrate our analyses.
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Bibliografia

  1.  N. Holighaus, G. Koliander, Z. Průša, and L.D. Abreu, “Characterization of Analytic Wavelet Transforms and a New Phaseless Reconstruction Algorithm,” IEEE Trans. Signal Process., vol. 67, no. 15, pp. 3894–3908, 2019.
  2.  M. Rayeezuddin, B. Krishna Reddy, and D. Sudheer Reddy, “Performance of reconstruction factors for a class of new complex continuous wavelets,” Int. J. Wavelets Multiresolution Inf. Process., vol. 19, no. 02, p. 2050067, 2021, doi: 10.1142/S0219691320500678.
  3.  Y. Guo, B.-Z. Li, and L.-D. Yang, “Novel fractional wavelet transform: Principles, MRA and application,” Digital Signal Process., vol. 110, p. 102937, 2021. [Online]. Available: doi: 10.1016/j.dsp.2020.102937.
  4.  V.K. Patel, S. Singh, and V.K. Singh, “Numerical wavelets scheme to complex partial differential equation arising from Morlet continuous wavelet transform,” Numer. Methods Partial Differ. Equations, vol. 37, no. 2, pp. 1163–1199, mar 2021.
  5.  C.K. Chui, Q. Jiang, L. Li, and J. Lu, “Signal separation based on adaptive continuous wavelet-like transform and analysis,” Appl. Comput. Harmon. Anal., vol. 53, pp. 151‒179, 2021.
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Autorzy i Afiliacje

Hua Yi
1
ORCID: ORCID
Yu-Le Ru
1
Yin-Yun Dai
1

  1. School of Mathematics and Physics, Jinggangshan University, Ji’an, 343009, P.R. China
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Abstrakt

Workflow Scheduling is the major problem in Cloud Computing consists of a set of interdependent tasks which is used to solve the various scientific and healthcare issues. In this research work, the cloud based workflow scheduling between different tasks in medical imaging datasets using Machine Learning (ML) and Deep Learning (DL) methods (hybrid classification approach) is proposed for healthcare applications. The main objective of this research work is to develop a system which is used for both workflow computing and scheduling in order to minimize the makespan, execution cost and to segment the cancer region in the classified abnormal images. The workflow computing is performed using different Machine Learning classifiers and the workflow scheduling is carried out using Deep Learning algorithm. The conventional AlexNet Convolutional Neural Networks (CNN) architecture is modified and used for workflow scheduling between different tasks in order to improve the accuracy level. The AlexNet architecture is analyzed and tested on different cloud services Amazon Elastic Compute Cloud- EC2 and Amazon Lightsail with respect to Makespan (MS) and Execution Cost (EC).
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Bibliografia

  1. A.M. Manasrah and H. Ba Ali, “Workflow scheduling using hybrid GA-PSO algorithm in cloud computing,” Wireless Commun. Mob. Comput., vol. 15, no. 3, pp. 1–16, 2018, doi: 10.1155/2018/1934784.
  2.  S.G. Ahmad, C.S. Liew, E.U. Munir, A.T. Fong, and S.U. Khan, “A hybrid genetic algorithm for optimization of scheduling workflow applications in heterogeneous computing systems,” J. Parallel Distrib. Comput., vol. 87, no. 2, pp. 80–90, 2016, doi: 10.1016/j. jpdc.2015.10.001.
  3.  H. Alaskar, A. Hussain, N. Al-Aseem, P. Liatsis, and D. Al-Jumeily, “Application of convolutional neural networks for automated ulcer detection in wireless capsule endoscopy images,” Sensors., vol. 19, no. 6, pp. 1265–1281, 2019, doi: 10.3390/s19061265.
  4.  L. Teylo, L. Arantes, P. Sens, and L.M.A. Drummond, “A dynamic task scheduler tolerant to multiple hibernations in cloud environments,” J. Cluster Comput., vol. 21, no. 5, pp. 1–23, 2020, doi: 10.1007/s10586-020-03175-2.
  5.  M. Sardaraz and M. Tahir, “A parallel multi-objective genetic algorithm for scheduling scientific workflows in cloud computing,” Int. J. Distri. Sensor Net., vol. 16, no. 8, pp. 1–10, 2020, doi: 10.1177/1550147720949142.
  6.  M. Hosseinzadeh, M.Y. Ghafour, and H.K. Hama, “Multi-objective task and workflow scheduling approaches in cloud computing: a comprehensive review,” J. Grid Comput., vol. 18, no. 3, pp. 327–356, 2020, doi: 10.1007/s10723-020-09533-z.
  7.  C.L. Chen, M.L. Chiang, and C.B. Lin, “The high performance of a task scheduling algorithm using reference queues for cloud- computing data centers,” Electronics, . vol. 9, no. 1, pp. 371–379, 2020, doi: 10.3390/electronics9020371.
  8.  Y. Hu, H. Wang, and W. Ma, “Intelligent Cloud workflow management and scheduling method for big data applications,” J. Cloud Comp, vol. 9, no. 1, pp. 1–13, 2020, doi: 10.1186/s13677-020-00177-8.
  9.  M. Grochowski, A. Kwasigroch, and A. Mikołajczyk,” Selected technical issues of deep neural networks for image classification purposes,” Bull. Polish Acad. Sci. Tech. Sci., vol. 67, no. 2, pp. 363–376, 2019, doi: 10.24425/bpas.2019.128485.
  10.  A.A. Nasr, N.A. El-Bahnasawy, and G. Attiya, “Cost-effective algorithm for workflow scheduling in cloud computing under deadline constraint,” Arab. J. Sci. Eng., vol.44, no. 4, pp. 3765–3780, 2019, doi: 10.1007/s13369-018-3664-6.
  11.  Z. Swiderska-Chadaj, T. Markiewicz, J. Gallego, G. Bueno, B. Grala, and M. Lorent, “Deep learning for damaged tissue detection and segmentation in Ki-67 brain tumor specimens based on the U-net model,” Bull. Polish Acad. Sci. Tech. Sci., vol. 66, no. 6, pp. 849–856, 2018, doi: 10.24425/bpas.2018.125932.
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Autorzy i Afiliacje

P. Tharani
1
A.M. Kalpana
1

  1. Department of Computer Science and Engineering, Government College of Engineering, Salem-636011, Tamil Nadu, India
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Abstrakt

In the paper the new paradigm for structural optimization without volume constraint is presented. Since the problem of stiffest design (compliance minimization) has no solution without additional assumptions, usually the volume of the material in the design domain is limited. The biomimetic approach, based on trabecular bone remodeling phenomenon is used to eliminate the volume constraint from the topology optimization procedure. Instead of the volume constraint, the Lagrange multiplier is assumed to have a constant value during the whole optimization procedure. Well known MATLAB topology based optimization code, developed by Ole Sigmund, was used as a tool for the new approach testing. The code was modified and the comparison of the original and the modified optimization algorithm is also presented. With the use of the new optimization paradigm, it is possible to minimize the compliance by obtaining different topologies for different materials. It is also possible to obtain different topologies for different load magnitudes. Both features of the presented approach are crucial for the design of lightweight structures, allowing the actual weight of the structure to be minimized. The final volume is not assumed at the beginning of the optimization process (no material volume constraint), but depends on the material’s properties and the forces acting upon the structure. The cantilever beam example, the classical problem in topology optimization is used to illustrate the presented approach.
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Bibliografia

  1.  W. Wang et al., “Space-time topology optimization for additive manufacturing”, Struct. Multidiscip. Optim., vol. 61, no. 1, pp. 1‒18, 2020, doi: 10.1007/s00158-019-02420-6.
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  3.  J. Zhu, et al., “A review of topology optimization for additive manufacturing: Status and challenges”, Chin. J. Aeronaut., vol. 34, no. 1, pp. 9‒110, 2021, doi: 10.1016/j.cja.2020.09.020.
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Autorzy i Afiliacje

Michał Nowak
1
ORCID: ORCID
Aron Boguszewski
1

  1. Poznan University of Technology, Division of Virtual Engineering, ul. Jana Pawła II 24, 60-965 Poznań, Poland
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Abstrakt

Appropriate modeling of unsteady aerodynamic characteristics is required for the study of aircraft dynamics and stability analysis, especially at higher angles of attack. The article presents an example of using artificial neural networks to model such characteristics. The effectiveness of this approach was demonstrated on the example of a strake-wing micro aerial vehicle. The neural model of unsteady aerodynamic characteristics was identified from the dynamic test cycles conducted in a water tunnel. The aerodynamic coefficients were modeled as a function of the flow parameters. The article presents neural models of longitudinal aerodynamic coefficients: lift and pitching moment as functions of angles of attack and reduced frequency. The modeled and trained aerodynamic coefficients show good consistency. This method manifests great potential in the construction of aerodynamic models for flight simulation purposes
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Bibliografia

  1.  C. Galiński and R. Żbikowski, “Some problems of micro air vehicles development,” Bull. Polish Acad. Sci. Tech. Sci., vol. 55, no. 1, pp. 91–98, 2007.
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  3.  K. Sibilski, M. Lasek, A. Sibilska-Mroziewicz, and M. Garbowski, Dynamcs of Flight of Fixed Wings Micro Aerial Vehicles, Publishing House of the Warsaw University of Technology, Warsaw, 2020.
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Autorzy i Afiliacje

Dariusz Rykaczewski
ORCID: ORCID
Mirosław Nowakowski
ORCID: ORCID
Krzysztof Sibilski
ORCID: ORCID
Wiesław Wróblewski
ORCID: ORCID
Michał Garbowski
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Abstrakt

The objective of the research was to investigate the efficiency of selected methods of data fusion from visual sensors used on-board satellites for attitude measurements. Data from a sun sensor, an earth sensor, and a star tracker were fused, and selected methods were applied to calculate satellite attitude. First, a direct numerical solution, a numerical and analytical solution of the Wahba problem, and the TRIAD method for attitude calculation were compared used for integrating data produced by a sun sensor and an earth sensor. Next, attitude data from the star tracker and earth/sun sensors were integrated using two methods: weighted average and Kalman filter. All algorithms were coded in the MATLAB environment and tested using simulation models of visual sensors. The results of simulations may be used as an indication for the best data fusion in real satellite systems. The algorithms developed may be extended to incorporate other attitude sensors like inertial and/or GNSS to form a complete satellite attitude system.
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Bibliografia

  1.  E. Babcock, “CubeSat Attitude Determination via Kalman Filtering of Magnetometer and Solar Cell Data,” in 25th AIAA/USU Conference on Small Satellites, 2011, [Online]. Available: https://digitalcommons.usu.edu/smallsat/2011/all2011/56/.
  2.  M. Fakhari Mehrjardi, H. Sanusi, Mohd.A.Mohd. Ali, and M.A. Taher, “Three-Axis Attitude Estimation Of Satellite Through Only Two- Axis Magnetometer Observations Using LKF Algorithm,” Metrol. Meas. Syst., vol. 22, no. 4, pp. 577–590, 2015, [Online]. Available: https://journals.pan.pl/dlibra/publication/104365/edition/90368.
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Autorzy i Afiliacje

Janusz Narkiewicz
1
ORCID: ORCID
Mateusz Sochacki
1
ORCID: ORCID
Adam Rodacki
1
Damian Grabowski
1

  1. Warsaw University of Technology, Faculty of Power and Aeronautical Engineering, Institute of Aeronautics and Applied Mechanics, ul. Nowowiejska 24, 00-665 Warsaw, Poland
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Abstrakt

In this investigation, high specific strength precipitation hardenable alloy AA7068-T6 was joined using friction stir welding. Experiments were carried out using the three factor-three level central composite face-centered design of response surface methodology. Regression models were developed to assess the influence of tool rotational speed, welding speed, and axial force on ultimate tensile strength and elongation of the fabricated joints. The validity of the developed models was tested using the analysis of variance (ANOVA), actual and adjusted values of the regression coefficients, and experimental trials. The analysis of the developed models together with microstructural studies of typical cases showed that the tool rotational speed and welding speed have a significant interaction effect on the tensile strength and elongation of the joints. However, the axial force has a relatively low interaction effect with tool rotational speed and welding speed on the strength and elongation of the joints. The process variables were optimized using the desirability function analysis. The optimized values of joint tensile strength and elongation – 516 MPa and 21.57%, respectively were obtained at a tool rotational speed of 1218 rpm, welding speed of 47 mm/ min, and an axial force of 5.3 kN.
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Bibliografia

  1.  A.M. Khalil, I.S. Loginova, A.V. Pozdniakov, A.O. Mosleh, and A.N. Solonin, “Evaluation of the Microstructure and Mechanical Properties of a New Modified Cast and Laser-Melted AA7075 Alloy,” Materials, vol. 12, no. 20, 2019. [Online]. Available: https://www.mdpi. com/1996-1944/12/20/3430.
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Autorzy i Afiliacje

M.D. Bindu
1
P.S. Tide
1
A.B. Bhasi
1
K.K. Ramachandran
2

  1. Division of Mechanical Engineering, Cochin University of Science and Technology, Kerala, India
  2. Department of Mechanical Engineering, Government Engineering College, Trissur, Kerala, India
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Abstrakt

The article deals with the technological principles regarding the final drying process of the porous ammonium nitrate (PAN) granules in multistage gravitational shelf dryers. The data on the dryer’s optimal technological operating modes are obtained. PAN samples are studied; the regularity of the porous structure change in the granule depending on the dryer’s hydrodynamic and thermodynamic conditions is established. Experimental data obtained during the research will be used to create a methodology for the engineering calculation of gravitational shelf dryers. Moreover, the data on the optimal operating conditions of the drying machines at the final drying stage will be used to improve the technology to form porous granules from agricultural ammonium nitrate.
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Bibliografia

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  24.  G. Martin and W. Barbour, Industrial nitrogen compounds and explosives, Chemical Manufacture and Analysis, Watchmaker Publishing, Seaside, 2003.
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  26.  D. Buczkowski and B. Zygmunt, “Detonation Properties of Mixtures of Ammonium Nitrate Based Fertilizers and Fuels”, Cent. Eur. J. Energetic Mater., vol. 8, no. 2, pp. 99–106, 2011.
  27.  A.E. Artyukhov and V.I. Sklabinskyi, “Experimental and industrial implementation of porous ammonium nitrate producing process in vortex granulators”, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, vol. 6, pp. 42–48, 2013.
  28.  A.E. Artyukhov and N.A. Artyukhova, “Utilization of dust and ammonia from exhaust gases: new solutions for dryers with different types of fluidized bed”, J. Environ. Health Sci. Eng., vol. 16, no. 2, pp. 193–204, 2018.
  29.  A.E. Artyukhov and V.I. Sklabinskyi, “Investigation of the temperature field of coolant in the installations for obtaining 3D nanostructured porous surface layer on the granules of ammonium nitrate”, J. Nano- and Electron. Phys., vol. 9, no. 1, pp. 01015-1–01015-4, 2017.
  30.  N.A. Artyukhova, “Multistage finish drying of the N4HNO3 porous granules as a factor for nanoporous structure quality improvement”, J. Nano- and Electron. Phys., vol. 10, no. 3, pp. 03030-1–03030-5, 2018.
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  34.  A.E. Artyukhov, N.A. Artyukhova, A.V. Ivaniia, and J. Gabrusenoks, “Multilayer modified NH4NO3 granules with 3D nanoporous structure: effect of the heat treatment regime on the structure of macro- and mezopores”, in Proc IEEE International Young Scientists Forum on Applied Physics and Engineering (YSF-2017), 2017, pp. 315–318.
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  38.  B. Paprocki, A. Pregowska, and J. Szczepanski, “Optimizing information processing in brain-inspired neural networks”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 68, no. 2, pp. 225–233, 2020, doi: 10.24425/bpasts.2020.131844.
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Autorzy i Afiliacje

Nadiia Artyukhova
1
Jan Krmela
2
ORCID: ORCID
Artem Artyukhov
1
ORCID: ORCID
Vladimíra Krmelová
3
Mária Gavendová
3
Alžbeta Bakošová
2

  1. Sumy State University, Oleg Balatskyi Academic and Research Institute of Finance, Economics and Management, Department of Marketing, Rymskogo-Korsakova st. 2, 40007, Sumy, Ukraine
  2. Alexander Dubček University of Trenčín, Faculty of Industrial Technologies in Púchov, Department of Numerical Methods and Computational Modeling, Ivana Krasku 491/30, 020 01 Púchov, Slovakia
  3. Alexander Dubček University of Trenčín, Faculty of Industrial Technologies in Púchov, Department of Material Technologies and Environment, Ivana Krasku 491/30, 020 01 Púchov, Slovakia
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Abstrakt

In the current work the calculations of the reaction cross-section of total fusion σ fus, the fusion barrier distribution D fus, and the probability P fus were achieved for systems ⁶He+⁶⁴Zn, ⁸B+⁵⁸Ni and ⁸He+¹⁹⁷Au which involve halo nuclei by using a semiclassical approach. The semiclassical and quantum mechanics treatments comprise the approximation of WKB for describing the relative motion among projectile nuclei and target nuclei, and the method of CDCC (Continuum Discretized Coupled Channel) for describing the intrinsic motion for the projectile and target nuclei. Our semiclassical calculations yielded findings that were compared to obtainable experimental data as well as quantum mechanics calculations. For fusion cross-sections σ fus below and above the Coulomb barrier Vb, the quantum mechanics coupled channels are very similar, according to the experimental results.
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Bibliografia

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Autorzy i Afiliacje

Maryam H. Abd Madhi
1
Fouad A. Majeed
1
ORCID: ORCID

  1. Department of Physics, College of Education for Pure Sciences, University of Babylon, Babylon, Iraq
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Abstrakt

This paper presents the results of diagnostic examinations conducted on the coils of super-heaters made of 10CrMo9‒10 steel that were operated in industrial conditions at 480°C for 130 thousand hours. The tube was exposed in a coal-fired boiler. The chemical and phase composition of the oxide/deposit layers formed on both sides of the tube walls (outside – flue-gas side and inside – steam side) and their sequence was examined using optical microscopy, scanning electron microscopy with electron backscatter diffraction and energy-dispersive X-ray spectroscopy, and X-ray diffraction. The changes in the mechanical properties caused by corrosion and aging processes were concluded from the hardness measurements. In addition, the nature of cracks in the oxide layers caused by pressing a Vickers indenter was determined. The results of these examinations have shown a high degradation of steel on the flue-gas inflow side and identified the main corrosion products and mechanisms.
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Autorzy i Afiliacje

Monika Gwoździk
1
Christiane Ullrich
2
Christian Schimpf
2
David Rafaja
2
Sławomir Kulesza
3
Mirosław Bramowicz
3

  1. Czestochowa University of Technology, ul. Dabrowskiego 69, 42-201 Czestochowa, Poland
  2. TU Bergakademie Freiberg, Akademiestraße 6, 09599 Freiberg, Germany
  3. University of Warmia and Mazury in Olsztyn, ul. Michała Oczapowskiego 2, 10-719 Olsztyn, Poland
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Abstrakt

Polyester coatings are among the most commonly used types of powder paints and present a wide range of applications. Apart from its decorative values, polyester coating successfully prevents the substrate from environmental deterioration. This work investigates the cavitation erosion (CE) resistance of three commercial polyester coatings electrostatic spray onto AW-6060 aluminium alloy substrate. Effect of coatings repainting (single- and double-layer deposits) and effect of surface finish (matt, silk gloss and structural) on resistance to cavitation were comparatively studied. The following research methods were used: CE testing using ASTM G32 procedure, 3D profilometry evaluation, light optical microscopy, scanning electron microscopy (SEM), optical profilometry and FTIR spectroscopy. Electrostatic spray coatings present higher CE resistance than aluminium alloy. The matt finish double-layer (M2) and single-layer silk gloss finish (S1) are the most resistant to CE. The structural paint showed the lowest resistance to cavitation wear which derives from the rougher surface finish. The CE mechanism of polyester coatings relies on the material brittle-ductile behaviour, cracks formation, lateral net-cracking growth and removal of chunk coating material and craters’ growth. Repainting does not harm the properties of the coatings. Therefore, it can be utilised to regenerate or smother the polyester coating finish along with improvement of their CE resistance.
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Autorzy i Afiliacje

Mirosław Szala
1
ORCID: ORCID
Aleksander Świetlicki
2
Weronika Sofińska-Chmiel
3

  1. Department of Materials Engineering, Faculty of Mechanical Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
  2. Students Research Group of Materials Technology, Department of Materials Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
  3. Analytical Laboratory, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, pl. Maria Curie-Sklodowska 3, 20-031 Lublin, Poland
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Abstrakt

User authentication is an essential element of any communication system. The paper investigates the vulnerability of the recently published first semiquantum identity authentication protocol (Quantum Information Processing 18: 197, 2019) to the introduced herein multisession attacks. The impersonation of the legitimate parties by a proper combination of phishing techniques is demonstrated. The improved version that closes the identified loophole is also introduced
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Autorzy i Afiliacje

Piotr Zawadzki
1
ORCID: ORCID

  1. Department of Telecommunications and Teleinformatics, Silesian University of Technology, ul. Akademicka 2A, 44-100 Gliwice, Poland

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