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Professor PhD Hristo Georgiev Valchanov

hristo@tu-varna.bg
052 383 439
207-4E

Education and training

2023 Professor, Computer Science, Technical University of Varna
2014 Associate Professor, Computer Science, Technical University of Varna

2008 Ph.D. degree in Computer Science. Thesis "Framework for Object-oriented Distributed Simulation"
1989 M.S. degree in Computer Science from Technical University of Varna
CCNA certified
CCAI certified

Teaching subjects

Operating Systems

Distributed Programming

Distributed Operating Systems

Network Infrastructures

Network Administration

Computer and Network Security

Research areas

Parallel and Distributed Computations

Virtualization Technologies

Parallel and Distributed Simulation



Publications

  • Aleksieva, V.; Valchanov, H.; Maleshkov, V.; Haka, A. Blockchain Solutions for Logistic Management. Blockchains 2024, 2, 445-457. ISSN: 2813-5288. https://doi.org/10.3390/blockchains2040019
  • D. Dinev, A. Haka, V. Aleksieva, H. Valchanov and B.Ilieva. An educational tool for Z-wave network simulations and finding optimal routes. Proc. of EEPES’23, AIP, 2024, ISSN 1551-7616
  • Yordanova, M., Haka, A., Aleksieva, V., Valchanov, H. A Simulation Tool for Security in ZigBee-Based IoT Networks. Engineering Proceedings, 2024, 70(1), 21. ISSN 26734591, DOI 10.3390/engproc2024070021
  • Maleshkov, V., Valchanov, H., Aleksieva, V. Blockchain-Based Model for Warehouse Management Systems for Artworks and Collectibles. Engineering Proceedings, 2024, 70(1), 39. ISSN 26734591, DOI 10.3390/engproc2024070039101. 
  • A. Haka, Y. Yordanov, D. Dinev, V. Aleksieva and H. Valchanov, "Simulation Environment for Examining the Pairing Methods in BLE Technology," 2023 18th Conference on Electrical Machines, Drives and Power Systems (ELMA), Varna, Bulgaria, 2023, pp. 1-4, doi: 10.1109/ELMA58392.2023.10202261
  • D. Dinev, A. Haka, V. Aleksieva and H. Valchanov, "Analysis of LoRa RSSI Data Using Simulations and Real Devices," 2023 18th Conference on Electrical Machines, Drives and Power Systems (ELMA), Varna, Bulgaria, 2023, pp. 1-4, doi: 10.1109/ELMA58392.2023.10202359.
  • Aleksieva, V., Valchanov, H., Haka, A., Dinev, D. Logistics Model Based on Smart Contracts on Blockchain and IoT. Engineering Proceedings, 2023, 41(1), 8, ISSN 26734591, DOI 10.3390/engproc2023041008
  • A.Haka, D. Dinev, V. Aleksieva and H. Valchanov. Integrated Environment for Monitoring Data from Wireless Sensor Technologies for IoT. Proc, of ICAI’23, IEEE, 2023, ISBN:979-8-3503-1291-1
  • Aleksieva, V.; Valchanov, H.; Haka, A.; Dinev, D. Model of Controlled Environment based on Blockchain and IoT. Proc. of CIEES’23, MDPI, 2023, ISBN:979-8-3503-3691-7
  • V. Aleksieva, H. Valchanov, Smart Contracts based on Hyperledger Fabric Blockchain for the Purpose of Health and Life Insurance Services, AIP Conference Proceedings 2570, 020002 (2022), CIEES’21,25-27.11.2021, Rouse, https://doi.org/10.1063/5.0099626
  • V. Aleksieva, H. Valchanov, M. Vangelova, Cloud Based System for Reservation of Medical Appointments, AIP Conference Proceedings 2570, 020004 (2022), CIEES’21,25-27.11.2021, Rouse, Bulgaria https://doi.org/10.1063/5.0099627
  • D. Todorov, H. Valchanov, V. Aleksieva, Comparative Evaluation of Traffic Load Balancing and QoS in SDN Networks, AIP Conference Proceedings 2570, 020016 (2022), CIEES’21,25-27.11.2021, Rouse, Bulgaria https://doi.org/10.1063/5.0099807
  • H.Valchanov, V.Aleksieva, M.Boycheva. Novel blockchain - based models for healthcare and life science solution, CIEES’22, 2022, K2.4, Electronic ISBN:978-1-6654-9149-5, DOI: 10.1109/CIEES55704.2022.9990883
  • H.Valchanov, V.Aleksieva. Blockchain and IoT integration for smart transportation, (EEPES 2022), Journal of Physics: Conference Series, Volume 2339, pp.1-8, Online ISSN: 1742-6596, Print ISSN: 1742-6588, DOI: https://doi.org/10.1088/1742-6596/2339/1/012012
  • H.Valchanov, V.Aleksieva. Smart Contracts based on Hyperledger Fabric Blockchain for the Purpose of Higher Education Subsidizing, CIEES’22, 2022, K2.5, Electronic ISBN:978-1-6654-9149-5, DOI: 10.1109/CIEES55704.2022.9990828
  • Y. Dimitrov, V. Aleksieva and H. Valchanov, "Method for Body Pose Recognition based on Two-Finger Touch Bezel on Wearable Device," 2021 17th Conference on Electrical Machines, Drives and Power Systems (ELMA), 2021, pp. 1-5, doi: 10.1109/ELMA52514.2021.9503001. ISBN:978-1-6654-3582-6
  • Haka, V. Aleksieva and H. Valchanov, "Simulation Environment for Research of Algorithms for Traffic Prioritisation in ZigBee Network," 2021 17th Conference on Electrical Machines, Drives and Power Systems (ELMA), 2021, pp. 1-4, doi: 10.1109/ELMA52514.2021.9503088. ISBN:978-1-6654-3582-6
  • Haka, V. Aleksieva and H. Valchanov, "A Comparison Study of Decisions for Computer Network Laboratory in Distant Learning Education," 2021 17th Conference on Electrical Machines, Drives and Power Systems (ELMA), 2021, pp. 1-4, doi: 10.1109/ELMA52514.2021.9503059. ISBN:978-1-6654-3582-6
  • Haka , D. Dinev , V. Aleksieva , H. Valchanov, Comparative analysis of ZigBee, 6LoWPAN and BLE technologies for the Internet of Things, AIP Conference Proceedings 2570, 020007 (2022);, CIEES’21,25-27.11.2021, Rouse, Bulgaria https://doi.org/10.1063/5.0099684
  • A.Haka, Y.Yordanov, V.Aleksieva, H.Valchanov, Simulation Environment for Bluetooth Low Energy Network , ICAI’21,30.09,.2021, pp. 287-290, doi: 10.1109/ICAI52893.2021.9639521 ISBN:978-1-6654-2661-9
  • D.Dinev, V.Aleksieva, H.Valchanov, K.Genov, Simulation Software For Finding Best Route in LoRaWan Network, ICAI’21,30.09., 2021, pp. 291-294, doi: 10.1109/ICAI52893.2021.9639718 ISBN:978-1-6654-2661-9
  • D.Dinev, V.Aleksieva, H.Valchanov, Comparative Analisis of Li Fi Simulators for Purposes of the Education, ICAI’21, 2021, pp. 125-128, doi: 10.1109/ICAI52893.2021.9639691 ISBN:978-1-6654-2661-9
  • A.Haka, V.Aleksieva, H.Valchanov, ZigBee Simulation Framework for Studying the Formation of a Hierarchical Tree Topology , ICAI’21, 2021, pp. 257-260, doi: 10.1109/ICAI52893.2021.9639563 ISBN:978-1-6654-2661-9
  • D. Todorov, H. Valchanov, V. Aleksieva, Shortest path routing algorithm with dynamic composite weights in SDN networks, ICAI’21, 2021, pp. 193-197, doi: 10.1109/ICAI52893.2021.9639512 ISBN:978-1-6654-2661-9
  • D. Todorov, H. Valchanov, V. Aleksieva, Simple routing algorithm with link discovery between source and destination hosts in SDN networks, ICAI’21, 2021, pp. 188-191, doi: 10.1109/ICAI52893.2021.9639742, ISBN:978-1-6654-2661-9
  • A. Haka, V. Aleksieva and H. Valchanov, "Comparative Analysis of Traffic Prioritisation Algorithms by LTE Base Station Scheduler," 2020 21st International Symposium on Electrical Apparatus & Technologies (SIELA), Bourgas, Bulgaria, 2020, pp. 1-4, doi: 10.1109/SIELA49118.2020.9167040. IEEE, ISBN:978-1-7281-4346-0
  • A. Haka, V. Aleksieva and H. Valchanov, "Comparative Analysis of Traffic Prioritisation Algorithms in 6LOWPAN Networks," 2020 21st International Symposium on Electrical Apparatus & Technologies (SIELA), Bourgas, Bulgaria, 2020, pp. 1-4, doi: 10.1109/SIELA49118.2020.9167116. ISBN:978-1-7281-4346-0
  • V. Aleksieva, H. Valchanov and A. Huliyan, "Implementation of Smart-Contract, Based on Hyperledger Fabric Blockchain," 2020 21st International Symposium on Electrical Apparatus & Technologies (SIELA), Bourgas, Bulgaria, 2020, pp. 1-4, doi: 10.1109/SIELA49118.2020.9167043. ISBN:978-1-7281-4346-0
  • A. Haka, V. Aleksieva and H. Valchanov, "Software Tool for Evaluation of Traffic Prioritisation Algorithms in 6LOWPAN Network," 2020 21st International Symposium on Electrical Apparatus & Technologies (SIELA), Bourgas, Bulgaria, 2020, pp. 1-4, doi: 10.1109/SIELA49118.2020.9167147. ISBN:978-1-7281-4346-0
  • D. Dinev, V. Aleksieva and H. Valchanov, "Study of Li-Fi Indoor Network Reliability," 2020 21st International Symposium on Electrical Apparatus & Technologies (SIELA), Bourgas, Bulgaria, 2020, pp. 1-4, doi: 10.1109/SIELA49118.2020.9167053. ISBN:978-1-7281-4346-0
  • V. Aleksieva, H. Valchanov and A. Huliyan. Implementation of Smart-Contract, Based on Hyperledger Fabric Blockchain for the Purpose of Insurance Services, Proc. of BIA, 2020, pp.113-116, DOI: 10.1109/BIA50171.2020.9244500. ISBN:978-1-7281-7073-2
  • A.Haka, V.Aleksieva, H.Valchanov. Enhanced Simulation Framework for Visualisation of IEEE 802.15.4 Frame Structure on Beacon Enabled Mode of ZigBee Sensor Network. Proc. of BIA 2020, pp.1-4, DOI: 10.1109/BIA50171.2020.9244507, ISBN:978-1-7281-7073-2
  • V. Aleksieva, H. Valchanov and A. Huliyan. Smart Contracts based on Private and Public Blockchains for the Purpose of Insurance Services, ICAI 2020, IEEE, ISBN:978-1-7281-9309-0, Electronic ISBN:978-1-7281-9308-3, DOI: 10.1109/ICAI50593.2020.9311371
  • A.Haka, V. Aleksieva, H. Valchanov and D.Dinev. Analysis of ZigBee Network Using Simulations and Experiments, ICAI 2020, IEEE, ISBN:978-1-7281-9309-0, Electronic ISBN:978-1-7281-9308-3, DOI: 10.1109/ICAI50593.2020.9311328
  • D.Todorov, H. Valchanov and V. Aleksieva. Load Balancing model based on Machine Learning and Segment Routing in SDN, ICAI 2020, IEEE, ISBN:978-1-7281-9309-0, Electronic ISBN:978-1-7281-9308-3, DOI: 10.1109/ICAI50593.2020.9311385
  • D. Dinev, V. Aleksieva and H. Valchanov. Simulation Framework For Studying Quality of Service Traffic Prioritization Algorithms in Li-Fi Network. ICAI 2020, IEEE, ISBN:978-1-7281-9309-0, Electronic ISBN:978-1-7281-9308-3, DOI: 10.1109/ICAI50593.2020.9311358
  • Y.Dimitrov, V. Aleksieva and H.Valchanov. Comparative analysis of prototypes for two-touch finger interfaces of smartwatch. CIEES 2020. IOP Conference Series: Materials Science and Engineering, doi: https://doi.org/10.1088/1757-899X/1032/1/012019, Online ISSN: 1757-899X, Print ISSN: 1757-8981
  • A.Haka, V.Aleksieva, H.Valchanov. 6LoWPAN Network Analysis Using Simulations and Experiments. CIEES 2020, IOP Conference Series: Materials Science and Engineering, doi: https://doi.org/10.1088/1757-899X/1032/1/012015, Online ISSN: 1757-899X, Print ISSN: 1757-8981
  • A.Haka, V.Aleksieva, H.Valchanov. Deployment and Analysis of Bluetooth Low Energy Network. CIEES 2020, IOP Conference Series: Materials Science and Engineering, doi: https://doi.org/10.1088/1757-899X/1032/1/012016, Online ISSN: 1757-899X, Print ISSN: 1757-8981

Additional information

Cisco academy instructor at TU-Varna
Member of ACM (Association for Computing Machinery)
Member of IEEE (Institute of Electrical and Electronics Engineers )
Member of Board of UAI (Union of Automatics and Informatics)


Foreign Languages

Russian, English


CV