Research interests - Computational intelligence, machine learning, IoT, data processing for event/anomaly detection, effective teaching
Research Projects
* COST CA-21114 Project: CLIL Network for Languages in Education: Towards bi- and multilingual disciplinary literacies (CLILNetLE), 10/2022-10/2026, Member of Working Groups (Development of bi-and multi-lingual disciplinary literacies across educational levels; Involving Stakeholders in bi/multilingual disciplinary literacies)
* TEYDEB-1505 (Project No: 5220055), Artificial Intelligence Based Decision Support System for Financial Scoring and Crediting of Company Credit Applications (for Koc Finans), 10/2022-9/2024, Principal Investigator

* TEYDEB-1505 (Project No: 5210098), Smart Technological Solutions to Predict Customer Complaints about Billing (for GSM company Turkcell Technology),  1/2022-12/2023, Researcher
* Erasmus+ (KA203-077194), Promoting Deep and Wide Thinking / Early Dual Degrees in Basic Sciences (thinkBS), 9/2019-8/2022, Researcher
* Anomaly Detection in Walking Trajectory (supported by Kadir Has University), 2018 - Application of statistical and neural network based machine learning to identify anomalies such as fall or irregular pattern, in walking trajectories. The trajectory is determined by localization algorithms processing BLE signals emitted from beacons and received by a wearable microcontroller unit.
* Self Learning for GSM (funded by Vodafone Turkey), 2014-2015 - Application of neural network based machine learning to identify base station locations from device logs.

Kadir Has AI Research Group

PUBLICATIONS

BOOK

• Sina Balkır, Günhan Dündar, A. Selçuk Öğrenci, Analog VLSI Design Automation, CRC Press, June 2003.

JOURNAL PAPERS

• İ. Bayraktaroğlu, A.S. Öğrenci, G. Dündar, S. Balkır, E. Alpaydın, "ANNSyS:An Analog Neural Network Synthesis System", Neural Networks, pp. February, 1999. (SCI)

• A.S. Öğrenci, G. Dündar, S. Balkır, “Fault Tolerant Training of Neural Networks in the Presense of MOS Transistor Mismatches,” IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, Vol.:48, No:3, pp. 272-281, March 2001. (SCI)

• A.H. Bilge, O. Pekcan, S. Kara, A.S. Ogrenci, “Epidemic models for phase transitions: application to a physical gel,” Phase Transitions, Vol.:90, No:9, pp. 905-913 http://dx.doi.org/10.1080/01411594.2017.1286487, 2017. (SCI)

• A. S. Ogrenci, T. Arsan, “Transmitter source location estimation using crowd data,” Computers & Electrical Engineering, ISSN0045-7906, Vo.;66, No:2, pp. 127-138, https://doi.org/10.1016/j.compeleceng.2017.09.026, 2018. (SCI-Exp)

• A.S. Ogrenci, O. Pekcan, S. Kara, A.H. Bilge, “Mathematical Characterization of Thermo-reversible Phase Transitions of Agarose Gels,” Journal of Macromolecular Science, Part B, Vol:57, No:5, pp. 364-376, DOI:10.1080/00222348.2018.1463052, 2018. (SCI-Exp)

• A.H. Bilge, A.S. Ogrenci, O. Pekcan, “Mathematical Models For Phase Transitions In Biogels,” Modern Physics Letters B, DOI: 10.1142/S0217984919501112 , 15.3.2019, 2019. (SCI)

• Y. Karadayi, M. N. Aydin, A. S. Ogrenci, “A Hybrid Deep Learning Framework for Unsupervised Anomaly Detection in Multivariate Spatio-Temporal Data,” Applied Sciences, 2020, 10(15), 5191, https://doi.org/10.3390/app10155191,  2020. (SCI-Exp, Q1)

• Y. Karadayi, M. N. Aydin, A. S. Ogrenci, “Unsupervised Anomaly Detection in Multivariate Spatio-Temporal Data Using Deep Learning: Early Detection of COVID-19 Outbreak in Italy,” IEEE Access, vol. 8, pp. 164155-164177, doi: 10.1109/ACCESS.2020.3022366, 2020. (SCI-Exp, Q1)

• Gilik, A., Ogrenci, A.S. & Ozmen, A. Air quality prediction using CNN+LSTM-based hybrid deep learning architecture, Environmental Science and Pollution Research, 29, 11920–11938, 2022. (SCI-Exp, Q2)

• A. S. Ogrenci, A. H. Bilge, O. Pekcan & M. Incegul, “Epidemic Models for Chemical Gel Phase Transformation: Effect of Optical Measurements with Different Wavelengths,” Journal of Macromolecular Science, Part B, doi:10.1080/00222348.2023.2203556, 2023. (SCI-Exp)

CONFERENCE PAPERS

• A.S. Öğrenci, S. Balkır, "Bezier function based waveform relaxation techniques for the simulation of MOS VLSI circuits," ESS'95: European Simulation Symposium, Erlangen, Germany, 1995.

• A.S. Öğrenci, G. Dündar, "SAFANN (Silicon Assembler For Analog Neural Networks)," TAINN'96: Turkish Artificial Intelligence and Neural Networks Symposium, Istanbul, Turkey, 1996.

• İ. Bayraktaroğlu, A.S. Öğrenci, G. Dündar, S. Balkır, E. Alpaydın, "On-Chip Training by Software for Analog Neural Networks Using ANNSyS," 6th NASA Symposium on VLSI Design, pp. 910-915, Albuquerque, USA, 1997. DOI: 10.1109/ICNN.1997.616146

• A.S. Öğrenci, G. Dündar, S. Balkır, E. Alpaydın, "Training of Multilayer Artificial Neural Networks with Nonlinear Multipliers in Analog Integrated Circuits,” SIU'97: Sinyal İşleme ve Uygulamaları Konferansı, Kuşadası, Turkey, 1997. (in Turkish)

• I.G. Erten, A.S. Öğrenci, G. Dündar, "A Compaction Algorithm for SAFANN," Proceedings of the 6th Turkish Symposium on Artificial Intelligence and Neural Networks (TAINN'97), pp. 311-316, Ankara, Turkey, 1997.

• İ. Bayraktaroğlu, A.S. Öğrenci, G. Dündar, S. Balkır, E. Alpaydın, "ANNSyS (An Analog Neural Network Synthesis System", ICNN'97: IEEE International Conference on Neural Networks, Houston, USA, 1997.

• A.S. Öğrenci, M.R. Becer, G. Dündar, S. Balkır, "Incorporating MOS Transistor Mismatches into Training of Analog Neural Networks", NC'98: ICSC/IFAC Symposium on Neural Computation, Vienna, Austria, 1998.

• G. Coşgül, A. S. Öğrenci, G. Dündar, "Neural Network Based CAD Tool for Modeling Manufacturing Variations in MOS Devices," Proceedings of the 8th Turkish Symposium on Artificial Intelligence and Neural Networks (TAINN'99), pp. 202-209, Istanbul, Turkey, 1999.

• İ. C. Çevikbaş, A.S. Öğrenci, G. Dündar, S. Balkır, “VLSI Implementation of GRBF (Gaussian Radial Basis Function) Networks,” ISCAS’2000 International Symposium on Circuits and Systems, Geneve, Switzerland, May 2000. DOI: 10.1109/ISCAS.2000.856143

• D. Albuz, A.S. Öğrenci, G. Dündar, "Using Sensitivity Analysis for Weight Quantization," Proceedings of the 9th Turkish Symposium on Artificial Intelligence and Neural Networks (TAINN'2000), pp. 127-136, Izmir, Turkey, 2000.

• E. Karakuş, A.S. Öğrenci, G. Dündar, "Parameter Quantization Effects in Gaussian Potential Function Neural Networks,” NNA2001 (2001 WSES International Conference on Neural Networks and Applications), Puerto de la Cruz, Spain, February 2001.

• T. Arsan, A.S. Öğrenci, İ.A. Yılmaz, “Kadir Has University Oracle Academic Initiative,” AB’2001: Akademik Bilişim 2001, Samsun, Turkey, 1-2 February 2001. (in Turkish)

• A.S. Öğrenci, “System Level Requirements for Molecular Computing Architectures in Realizing Information Processing Systems”, NATO-ASI, Molecular Electronics: Bio-sensor and Bio-computer, Pisa, Italy, 24 June - 4 July 2002.

• A. Bürümcek, A.S. Öğrenci, “Analysis of Square Root Function Design and Optimization in FPGAs,” DSD2003 (EUROMICRO Symposium On Digital System Design), Antalya, Turkey, 1-6 Sept. 2003.

• A.S. Öğrenci, T. Arsan, T. Saydam, “An Open Software Architecture of Neural Networks: NeuroSoft,” SEA2004 (IASTED Conference on Software Engineering and Applications), Boston, USA, 9-11 Nov. 2004.

• T. Arsan, A.S. Öğrenci, T. Saydam, “A Systems Software Architecture For Training Neural, Fuzzy Neural And Genetic Computational Intelligent Networks,” WCCI2006 (World Congress on Computational Intelligence, 2006 International Joint Conference on Neural Networks), pp. 5275-5280, Vancouver, Canada, 16-21 July 2006. DOI: 10.1109/IJCNN.2006.247282

• A.S. Öğrenci, “Abstraction in FPGA Implementation of Neural Networks,” The 9th WSEAS International Conference on NEURAL NETWORKS (NN'08), Sofia, Bulgaria, May 2-4, 2008.

• A.S. Öğrenci, “Empirical results about efforts for effective teaching to y-generation freshman students,” 11th International Conference on Information Technology Based Higher Education and Training (ITHET 2012), Istanbul, Turkey, 2012. DOI: 10.1109/ITHET.2012.6246043

• A.S. Öğrenci, “Complex event post processing for traffic accidents,” 13th IEEE International Symposium on Computational Intelligence and Informatics (CINTI 2012), pp. 341-345, Budapest, Hungary, 2012. DOI: 10.1109/CINTI.2012.6496787

• A.S. Öğrenci, “Why do students prefer search engines over academic databases,” 12th International Conference on Information Technology Based Higher Education and Training (ITHET 2013), pp. 1-3, Antalya, Turkey, 2013. DOI: 10.1109/ITHET.2013.6671054

• A.S. Öğrenci, “Collaborative Peer Assessment in a Blended Learning Environment,” Immersive Education Europe Summit (iEDE 2013), London, UK, 2013.

• A.S. Öğrenci, Z. Erol “Disease Information System Based on Web Services,” 2014 7th International Conference on Computer Science and Information Technology (ICCSIT 2014), Barcelona, Spain, 2014.

• A. S. Öğrenci, “How to Prevent Students Falling Down in a Flipped Classroom,” The Future of Education, Florence, Italy, 2015.

• A. Yesilkaya, O. Karatalay, A.S. Ogrenci and E. Panayirci “Channel Estimation for Visible Light Communications Using Neural Networks,” WCCI2016: IEEE World Congress on Computational Intelligence, pp. 320-325, Vancouver, 2016. 2016 International Joint Conference on Neural Networks (IJCNN) DOI: 10.1109/IJCNN.2016.7727215

• J. Dorner, S. Favrichon and A.S. Ogrenci, “Weight Exchange in Distributed Learning,” WCCI2016: IEEE World Congress on Computational Intelligence, pp. 3081-3084, Vancouver, 2016. DOI: 10.1109/IJCNN.2016.7727591

• M. T. Altabba, T. Ayabakan, A. S. Ogrenci, “Fuzzy Logic for Decision Extraction from Product Reviews,” International Conference on Energy, Communication, Data Analytics and Soft Computing (ICECDS 2017), Chennai, India, 1-2.8.2017.

• E. Cay, Y. Mert, A. Bahcetepe, B. K. Akyazı, A. S. Ogrenci, “Beacons for Indoor Positioning,” Int. Conference on Engineering and Technology ICET17, Antalya, 21-23.8.2017

• O. Ulgen, A. S. Ogrenci, “Structured Learning Based Turkish Sentiment Analysis,” ASYU2017 Innovations and Applications in Intelligent Systems, Alanya, 5-7.10.2017.

• A. S. Ogrenci, “Anomaly Detection in Walking Trajectory,” 26. IEEE Sinyal İşleme ve İletişim Uygulamaları Kurultayı (SİU), İzmir, 2-5.5.2018.

• Arif Selçuk ÖĞRENCİ, Atilla ÖZMEN, Batuhan ALBAYRAK, Buket DARICI, Furkan KİRACI, Kerem ERTEZ, “ Sickle Cell Anemia Detection,” TIPTEKNO2018 Konferansı, 8-10.11.2018, Kıbrıs

• Ayşenur Gilik, Batuhan Albayrak, Arif Selçuk Öğrenci, “Clustering of Countries using Computational Models,”INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED COMPUTER SCIENCE AND ENGINEERING 2018, 23-24.11.2018, Ankara.

• Mhd Tahssin Altabbaa, Arif Selcuk Ogrenci, Erdal Panayirci, and H. Vincent Poor, “Sparse Channel Estimation for Space-Time Block Coded OFDM-Based Underwater Acoustic Channels,” 2018 IEEE Global Communications Conference (GLOBECOM), UAE, 2018.

• F. K. Mirza, A. S. Ogrenci, “Using Hybrid Approaches for Credit Application Scoring,” 23rd IEEE International Symposium on Computational Intelligence and Informatics (CINTI 2023), pp. 111-116, Budapest, Hungary, 2023. DOI: 10.1109/CINTI59972.2023.10382025

Address

Kadir Has University
Faculty of Engineering and Natural Sciences
Fatih, 34083 Istanbul, Turkey

Contacts

Email: ogrenci@khas.edu.tr
ogrenci@ieee.org                   
Phone: +90 212 5336532 x1406
+90 542 2834864 
Fax: +90 212 5335753

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