Oguz Kucur

122 papers B 9Misc 2Journal 68Unranked 43
YearRankTypeTitle / Venue / Authors
2025 J jnl
Outage Performance of User-Assisted Energy Harvesting Full Duplex MIMO-NOMA Networks.
Int. J. Commun. Syst.
Büsra Demirkol, Oguz Kucur
2024 J jnl
A Survey on Orthogonal Time Frequency Space Modulation.
IEEE Open J. Commun. Soc.
Mahmoud Aldababsa, Serdar Özyurt, Günes Karabulut-Kurt, Oguz Kucur
2024 B conf
OP Analysis of Alamouti/MRC NOMA System with SDR-Based Real-Time Implementation.
WCNC
Lütfullah Özkan, Büsra Demirkol, Saliha Büyükçorak, Oguz Kucur, Günes Karabulut-Kurt
2024 J jnl
Performance of User-Assisted Nonlinear Energy Harvesting NOMA Network with Alamouti/MRC.
CoRR
Büsra Demirkol, Oguz Kucur
2024 — conf
Secrecy Outage Performance of SWIPT-NOMA Network with Alamouti/MRC.
SIU
Büsra Demirkol, Oguz Kucur, Günes Karabulut-Kurt
2024 — conf
Unlocking MIMO Potential: Transmit Antenna Selection and Maximal Ratio Combining Meet Keyhole RIS for Enhanced Performance.
ICCSPA
Hakan Balaban, Ferkan Yilmaz, Oguz Kucur
2023 — conf
OP Performance of UAV Assisted Multi-User MIMO NOMA SWIPT System.
SIU
Harun Çagiran, Oguz Kucur, Saliha Büyükçorak
2023 — conf
Outage Performance of User-Assisted Alamouti/MRC-SWIPT NOMA Network.
SIU
Büsra Demirkol, Oguz Kucur
2023 J jnl
Outage performance of NOMA with Alamouti/MRC in dual-hop energy harvesting relay networks.
Phys. Commun.
Büsra Demirkol, Mesut Toka, Oguz Kucur
2023 J jnl
Performance analyses of TAS/Alamouti-MRC NOMA in dual-hop full-duplex AF relaying networks.
Trans. Emerg. Telecommun. Technol.
Mesut Toka, Eray Güven, Mehmet Akif Durmaz, Günes Karabulut-Kurt, Oguz Kucur
2023 — conf
Performance of Multiuser MIMO-SWIPT Layered Transmission Systems.
SIU
Serdar Özyurt, Oguz Kucur
2023 — conf
Quasisynchronous LoRa for LEO Nanosatellite Communications.
BlackSeaCom
Hasan Gökhan Uysal, Ferkan Yilmaz, Hakan Ali Çirpan, Oguz Kucur, Hüseyin Arslan
2023 — conf
Secrecy Outage Probability of SWIPT-OFDMA Schemes with Transmit Antenna Selection.
SIU
Ahmet Faruk Coskun, Oguz Kucur, Gunes Karabulut-Kurt
2022 J jnl
A Survey on Multiuser SWIPT Communications for 5G+.
IEEE Access
Serdar Özyurt, Ahmet F. Coskun, Saliha Buyukcorak, Gunes Karabulut-Kurt, Oguz Kucur
2022 — conf
Performance of Joint Antenna Selection Schemes in Energy Harvesting Cooperative Networks.
ICCCNT
Harun Çagiran, Oguz Kucur
2022 J jnl
Power permutation modulation in multiple-input multiple-output systems.
Trans. Emerg. Telecommun. Technol.
Serdar Özyurt, Oguz Kucur
2022 J jnl
Unified Performance Analysis of Antenna Selection Schemes for Cooperative MIMO-NOMA With Practical Impairments.
IEEE Trans. Wirel. Commun.
Mahmoud Aldababsa, Eray Güven, Mehmet Akif Durmaz, Caner Göztepe, Günes Karabulut-Kurt, Oguz Kucur
2021 J jnl
Performance Analyses of MRT/MRC in Dual-Hop NOMA Full-Duplex AF Relay Networks with Residual Hardware Impairments.
CoRR
Mesut Toka, Eray Guven, Gunes Karabulut-Kurt, Oguz Kucur
2021 J jnl
Performance Analyses of TAS/Alamouti-MRC NOMA in Dual-Hop Full-Duplex AF Relaying Networks.
CoRR
Mesut Toka, Eray Guven, Mehmet Akif Durmaz, Gunes Karabulut-Kurt, Oguz Kucur
2021 J jnl
Performance analyses of TAS/Alamouti-MRC NOMA system with channel estimation error, feedback delay, and imperfect SIC.
Trans. Emerg. Telecommun. Technol.
Mesut Toka, Oguz Kucur
2021 J jnl
Performance of MRT/RAS MIMO-NOMA With Residual Hardware Impairments.
IEEE Wirel. Commun. Lett.
Mesut Toka, Oguz Kucur
2021 J jnl
Performance of Relay Selection for NOMA Based Cooperative Networks Over Shadowed Fading Channels.
IEEE Trans. Veh. Technol.
Efendi Fidan, Oguz Kucur
2021 — conf
Performance of TAS/GSC in Multihop Networks over Nakagami-m Fading Channels.
SIU
Efendi Fidan, Oguz Kucur
2020 — conf
A Four-User Non-Orthogonal Multiple Access System Implementation in Software Defined Radios.
BlackSeaCom
Mehmet Akif Durmaz, Eray Güven, Günes Karabulut-Kurt, Mesut Toka, Mahmoud Aldababsa, Oguz Kucur
2020 J jnl
Bit Error Rate for NOMA Network.
IEEE Commun. Lett.
Mahmoud Aldababsa, Caner Göztepe, Gunes Karabulut-Kurt, Oguz Kucur
2020 J jnl
Majority based antenna selection schemes in downlink NOMA network with channel estimation errors and feedback delay.
IET Commun.
Mahmoud Aldababsa, Oguz Kucur
2020 — conf
Outage Performance of Antenna Selection Schemes in NOMA Networks using Amplify-and-Forward Energy Harvesting Relay.
SIU
Büsra Demirkol, Oguz Kucur
2020 — conf
Outage Performance of Dual-Hop TAS/Alamouti-STBC NOMA System.
SIU
Mesut Toka, Oguz Kucur
2020 J jnl
Outage and ergodic sum-rate performance of cooperative MIMO-NOMA with imperfect CSI and SIC.
Int. J. Commun. Syst.
Mahmoud Aldababsa, Oguz Kucur
2020 J jnl
Performance Analysis of OSTBC-NOMA System in the Presence of Practical Impairments.
IEEE Trans. Veh. Technol.
Mesut Toka, Oguz Kucur
2020 — conf
Performance of Decode-and-Forward Multihop Networks over i.n.i.d. Nakagami-m Fading Channels.
SIU
Efendi Fidan, Oguz Kucur
2020 J jnl
Performance of cooperative full-duplex AF relay networks with generalised relay selection.
IET Commun.
Efendi Fidan, Oguz Kucur
2020 J jnl
Performance of cooperative multiple-input multiple-output NOMA in Nakagami-
IET Commun.
Mahmoud Aldababsa, Oguz Kucur
2020 J jnl
Quadrature NOMA: A Low-Complexity Multiple Access Technique With Coordinate Interleaving.
IEEE Wirel. Commun. Lett.
Serdar Özyurt, Oguz Kucur
2020 — conf
Relay Selection for Cooperative NOMA Networks over Fading and Shadowing Channels.
SIU
Efendi Fidan, Oguz Kucur
2019 — conf
Cooperative NOMA with Antenna Selection Schemes.
SIU
Mahmoud Aldababsa, Oguz Kucur
2019 — conf
Non-Orthogonal Multiple Access System Implementation in Software Defined Radios.
SIU
Mehmet Akif Durmaz, Caner Göztepe, Günes Karabulut-Kurt, Mesut Toka, Oguz Kucur
2019 — conf
On Relay Selection for NOMA Based Cooperative Networks.
SIU
Efendi Fidan, Oguz Kucur
2019 — conf
Outage Performance of NOMA with Majority Based TAS/MRC Scheme in Rayleigh Fading Channels.
SIU
Mahmoud Aldababsa, Oguz Kucur
2019 — conf
Outage Performance of OSTBC-NOMA System in the presence of Channel Estimation Error and Feedback Delay.
SIU
Mesut Toka, Oguz Kucur, Büsra Demirkol
2019 — conf
Outage Probability of Max-Max Antenna Selection in Dual-Hop Full Duplex Amplify-and-Forward Relaying Network over Nakagami-m Fading Channel.
SIU
Büsra Demirkol, Mesut Toka, Oguz Kucur
2019 J jnl
Performance of dual-hop full-duplex relay networks with orthogonal space-time block coding in Nakagami-
IET Commun.
Mesut Toka, Oguz Kucur
2019 J jnl
Secrecy Outage Probability of Conventional and Modified TAS/Alamouti-STBC Schemes With Power Allocation in the Presence of Feedback Errors.
IEEE Trans. Veh. Technol.
Ahmet Faruk Coskun, Oguz Kucur
2018 J jnl
A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond.
Wirel. Commun. Mob. Comput.
Mahmoud Aldababsa, Mesut Toka, Selahattin Gökceli, Günes Karabulut-Kurt, Oguz Kucur
2018 J jnl
Non-Orthogonal Multiple Access With Alamouti Space-Time Block Coding.
IEEE Commun. Lett.
Mesut Toka, Oguz Kucur
2018 J jnl
Nonorthogonal Multiple Access for 5G and Beyond.
Wirel. Commun. Mob. Comput.
Oguz Kucur, Günes Karabulut-Kurt, Muhammad Zeeshan Shakir, Imran Shafique Ansari
2018 J jnl
Performance analysis of maximal ratio combining with transmit antenna selection and signal space diversity under exponential antenna correlation.
IET Commun.
Serdar Özyurt, Oguz Kucur
2018 J jnl
Performance of OFDM With Signal Space Diversity Using Subcarrier Coordinate Interleaving.
IEEE Trans. Veh. Technol.
Serdar Ozyurt, Oguz Kucur
2018 J jnl
Performance of Transceiver Antenna Selection in Two Way Full-Duplex Relay Networks Over Rayleigh Fading Channels.
IEEE Trans. Veh. Technol.
Efendi Fidan, Oguz Kucur
2018 J jnl
Zero-Forcing Beamforming With Signal Space Diversity.
IEEE Trans. Veh. Technol.
Serdar Ozyurt, Oguz Kucur
2017 J jnl
New results on the sum of Gamma random variates with application to the performance of wireless communication systems over Nakagami-
Trans. Emerg. Telecommun. Technol.
Imran Shafique Ansari, Ferkan Yilmaz, Mohamed-Slim Alouini, Oguz Kucur
2017 — conf
Outage performance of dual hop full-duplex relaying with Alamouti/MRC over Rayleigh fading channels.
BlackSeaCom
Mesut Toka, Oguz Kucur
2017 — conf
Outage performance of partial antenna selection in the full-duplex decode-and-forward relay networks.
SIU
Mesut Toka, Oguz Kucur
2017 — conf
Performance analysis of signal space diversity with transmit antenna selection and maximal ratio combining.
SIU
Serdar Ozyurt, Oguz Kucur
2017 J jnl
Performance of Joint Relay and Antenna Selection in the Full-Duplex Amplify-and-Forward Relay Networks.
Wirel. Pers. Commun.
Mesut Toka, Oguz Kucur, Bekir S. Tezekici
2017 J jnl
Performance of Two-Way Relay Networks with Generalized Transmit and Receive Antenna Selection over Rayleigh Fading Channels.
Wirel. Pers. Commun.
Efendi Fidan, Oguz Kucur
2017 — conf
Performance of spatial modulation schemes using transmit antenna selection with imperfect feedback.
ISWCS
Ahmet Faruk Coskun, Oguz Kucur
2017 — conf
SSER analysis of AF MIMO TWRNs with single and multiple antenna selection schemes.
SIU
Efendi Fidan, Oguz Kucur
2016 J jnl
Analysis of diversity schemes employing antenna selection in the presence of channel estimation errors and feedback delay.
Wirel. Commun. Mob. Comput.
Ahmet Faruk Coskun, Oguz Kucur
2016 J jnl
Conventional and modified TAS/OSTBC schemes in dual-hop fixed-gain amplify-and-forward relaying systems with imperfect feedback.
Wirel. Commun. Mob. Comput.
Ahmet Faruk Coskun, Oguz Kucur
2016 — conf
Outage performance of dual hop full-duplex MIMO relay networks with TAS/MRC over Rayleigh fading channels.
ISWCS
Mesut Toka, Oguz Kucur
2016 — conf
Outage probability of full-duplex MIMO relay networks with co-channel interference over Rayleigh fading channels.
SIU
Mesut Toka, Oguz Kucur
2016 B conf
Performance of two-way AF MIMO relay networks with single and multiple antenna selection schemes.
PIMRC
Efendi Fidan, Oguz Kucur
2016 J jnl
Unified Performance Analysis of Multi-antenna Techniques in Dual Hop Networks over Nakagami-m Fading Channels.
Wirel. Pers. Commun.
Ahmet Yilmaz, Oguz Kucur
2016 J jnl
Unified analysis of transmit, receive and hybrid diversity techniques over generalized-
Wirel. Commun. Mob. Comput.
Ahmet Yilmaz, Oguz Kucur
2015 J jnl
Analysis of transmit antenna selection/orthogonal space-time block coding with receive selection and combining in the presence of feedback errors.
Wirel. Commun. Mob. Comput.
Ahmet F. Coskun, Oguz Kucur
2015 — conf
BER performance of three-phase digital network coding employing TAS/OFDM in the presence of imperfect channel state information.
SIU
Ahmet Faruk Coskun, Oguz Kucur
2015 J jnl
Performance analyses of decode-and-forward multi-hop relay network scenarios with multiple antenna techniques over Nakagami-m fading channels.
IET Commun.
Ahmet Yilmaz, Oguz Kucur
2015 — conf
Performance of joint relay and antenna selection in the Full-Duplex Amplify-and-Forward relay networks.
SIU
Mesut Toka, Oguz Kucur, Bekir Sami Tezekici
2015 — conf
Performance of multi-antenna two-way relay networks with generalized antenna selection over Rayleigh Fading Channels.
SIU
Efendi Fidan, Oguz Kucur
2014 J jnl
End-to-end performance of transmit antenna selection and generalized selection combining in dual-hop amplify-and-forward relay network in the presence of feedback errors.
Wirel. Commun. Mob. Comput.
Ahmet Yilmaz, Oguz Kucur
2014 J jnl
Feedback-error-resistant and reduced feedback-rate orthogonal space-time block coding scheme employing single transmit antenna selection.
IET Commun.
Ahmet F. Coskun, Oguz Kucur
2014 — conf
Performance of dual-hop AF relay systems employing modified TAS/OSTBC scheme in both hops in the presence of feedback errors.
SIU
Ahmet Faruk Coskun, Oguz Kucur
2014 J jnl
Performance of joint transmit and receive antenna selection in dual hop amplify-and-forward relay network over Nakagami-
Wirel. Commun. Mob. Comput.
Ahmet Yilmaz, Oguz Kucur
2014 J jnl
Performances of Transmit Antenna Selection, Receive Antenna Selection, and Maximal-Ratio-Combining-Based Hybrid Techniques in the Presence of Feedback Errors.
IEEE Trans. Veh. Technol.
Ahmet Yilmaz, Oguz Kucur
2013 J jnl
Feedback-Rate Efficient Transmit Antenna Selection/Alamouti Scheme with Robust Error Performance in the Presence of Feedback Errors.
IEEE Commun. Lett.
Ahmet F. Coskun, Oguz Kucur
2013 — conf
Modified transmit antenna selection/orthogonal space-time block coding scheme with reduced feedback-rate and robust performance in the presence of feedback errors.
SIU
Ahmet Faruk Coskun, Oguz Kucur
2013 J jnl
On the Performance of Transmit Antenna Selection Based on Shadowing Side Information.
IEEE Trans. Veh. Technol.
Ahmet Yilmaz, Ferkan Yilmaz, Mohamed-Slim Alouini, Oguz Kucur
2013 J jnl
Performance analysis of Alamouti scheme with transmit antenna selection in non-identical Nakagami-
Wirel. Commun. Mob. Comput.
Ahmet F. Coskun, Oguz Kucur, Ibrahim Altunbas
2013 J jnl
Performance analysis of hybrid transmit antenna selection/maximal-ratio transmission in Nakagami-
Wirel. Commun. Mob. Comput.
Ahmet F. Coskun, Oguz Kucur
2013 — conf
Performance of decode-and-forward multi-hop relay network with orthogonal space-time block coding over Nakagami-m fading channels.
SIU
Ahmet Yilmaz, Oguz Kucur
2012 — conf
Error performance of space-time block coded systems with joint transmit and receive antenna selection in the presence of feedback errors.
SIU
Ahmet F. Coskun, Oguz Kucur
2012 J jnl
New Results on the Sum of Gamma Random Variates With Application to the Performance of Wireless Communication Systems over Nakagami-m Fading Channels.
CoRR
Imran Shafique Ansari, Ferkan Yilmaz, Mohamed-Slim Alouini, Oguz Kucur
2012 J jnl
On the Performance of Transmit Antenna Selection Based on Shadowing Side Information
CoRR
Ahmet Yilmaz, Ferkan Yilmaz, Mohamed-Slim Alouini, Oguz Kucur
2012 — conf
On the sum of gamma random variates with application to the performance of maximal ratio combining over Nakagami-m fading channels.
SPAWC
Imran Shafique Ansari, Ferkan Yilmaz, Mohamed-Slim Alouini, Oguz Kucur
2012 J jnl
Performance Analysis of Maximal-Ratio Transmission/Receive Antenna Selection in Nakagami-m Fading Channels With Channel Estimation Errors and Feedback Delay.
IEEE Trans. Veh. Technol.
Ahmet Faruk Coskun, Oguz Kucur
2012 J jnl
Performance Analysis of Space-Time Block Codes with Transmit Antenna Selection in Nakagami-m Fading Channels.
Wirel. Pers. Commun.
Ahmet F. Coskun, Oguz Kucur, Ibrahim Altunbas
2012 — conf
Performance analysis of dual hop amplify-and-forward relay network with antenna selection for fixed relay gain.
SIU
Ahmet Yilmaz, Oguz Kucur
2012 J jnl
Performance comparison of wavelet based and conventional OFDM systems in multipath Rayleigh fading channels.
Digit. Signal Process.
Volkan Kumbasar, Oguz Kucur
2012 J jnl
Performance of Transmit Antenna Selection and Maximal-Ratio Combining in Dual Hop Amplify-and-Forward Relay Network over Nakagami-m Fading Channels.
Wirel. Pers. Commun.
Ahmet Yilmaz, Oguz Kucur
2012 J jnl
Unified Analysis of Transmit Antenna Selection/Space-Time Block Coding with Receive Selection and Combining over Nakagami-m Fading Channels in the Presence of Feedback Errors.
CoRR
Ahmet Faruk Coskun, Oguz Kucur
2011 B conf
Outage probability performance of transmit antenna selection and generalized selection combining in a dual hop amplify-and-forward relay network.
IWCMC
Ahmet Yilmaz, Oguz Kucur
2011 J jnl
Performance Analysis of Joint Single Transmit and Receive Antenna Selection in Nakagami-m Fading Channels.
IEEE Commun. Lett.
Ahmet F. Coskun, Oguz Kucur
2011 J jnl
Performance analysis of joint single transmit and receive antenna selection in non-identical nakagami-m fading channels.
IET Commun.
Ahmet F. Coskun, Oguz Kucur
2011 B conf
Performance of combined transmit antenna selection and maximal-ratio transmission in Nakagami-m fading channels.
IWCMC
Ahmet F. Coskun, Oguz Kucur
2011 J jnl
Performance of rotated PSK modulation in Nakagami-m fading channels.
Digit. Signal Process.
Ahmet Yilmaz, Oguz Kucur
2011 — conf
Transmit Antenna Selection Based on Shadowing Side Information.
VTC Spring
Ferkan Yilmaz, Ahmet Yilmaz, Mohamed-Slim Alouini, Oguz Kucur
2010 — conf
A novel framework on exact average symbol error probabilities of multihop transmission over amplify-and-forward relay fading channels.
ISWCS
Ferkan Yilmaz, Oguz Kucur, Mohamed-Slim Alouini
2010 — conf
A unified framework for the statistical characterization of the SNR of amplify-and-forward multihop channels.
ICT
Ferkan Yilmaz, Oguz Kucur, Mohamed-Slim Alouini
2010 J jnl
Better wavelet packet tree based OFDM for multipath powerline channel.
Comput. Electr. Eng.
Volkan Kumbasar, Oguz Kucur
2010 B conf
Error performance of Transmit Antenna Selection / Maximal Ratio Combining in two hop Amplify-and-Forward relay system over Rayleigh fading channel.
PIMRC
Ahmet Yilmaz, Oguz Kucur
2010 B conf
Error performance of joint transmit and receive antenna selection in two hop amplify-and-forward relay system over Nakagami-m fading channels.
PIMRC
Ahmet Yilmaz, Oguz Kucur
2010 B conf
Exact capacity analysis of multihop transmission over amplify-and-forward relay fading channels.
PIMRC
Ferkan Yilmaz, Oguz Kucur, Mohamed-Slim Alouini
2010 B conf
Performance of maximal-ratio transmission with receive antenna selection in Nakagami-m fading channels.
PIMRC
Ahmet F. Coskun, Oguz Kucur
2010 J jnl
Performance of multi-processing gain QS-CDMA over AWGN and Rayleigh fading channels.
Digit. Signal Process.
Selim Dilek, Oguz Kucur
2009 — conf
Alamouti coded wavelet based OFDM for multipath fading channels.
WTS
Volkan Kumbasar, Oguz Kucur
2009 J jnl
Optimization of wavelet based OFDM for multipath powerline channel by genetic algorithm.
Wirel. Commun. Mob. Comput.
Volkan Kumbasar, Oguz Kucur, Ahmet Arif Ergin, Ertan Öztürk
2009 — conf
Performance analysis of rotated PSK over Nakagami-m fading channels.
ISWCS
Ahmet Yilmaz, Oguz Kucur
2009 — conf
Searching better wavelet packet tree for ISI and ICI reduction in WOFDM.
WTS
Volkan Kumbasar, Oguz Kucur
2009 J jnl
Symbol Error Rate Performance of QS-CDMA over Frequency Selective Time Non-Selective Multipath Generalized Gamma Fading Channels.
Wirel. Pers. Commun.
Ferkan Yilmaz, Oguz Kucur
2008 J jnl
Better wavelet packet tree structures for PAPR reduction in WOFDM systems.
Digit. Signal Process.
Volkan Kumbasar, Oguz Kucur
2008 B conf
Exact performance of wireless multihop transmission for M-ary coherent modulations over generalized gamma fading channels.
PIMRC
Ferkan Yilmaz, Oguz Kucur
2008 J jnl
Performance of quasisynchronous scale time code division multiple access for AWGN channel.
Comput. Electr. Eng.
Ferkan Yilmaz, Oguz Kucur
2007 J jnl
Bit error rate performance of Haar wavelet based scale-code division multiple access (HW/S-CDMA) over the asynchronous AWGN channel.
Int. J. Commun. Syst.
Oguz Kucur, Ertan Öztürk, Guillermo E. Atkin
2007 J jnl
Error Performance of Rotated Phase Shift Keying Modulation over Fading Channels.
Wirel. Pers. Commun.
Serdar Özyurt, Oguz Kucur, Ibrahim Altunbas
2007 J jnl
ICI reduction in OFDM systems by using improved sinc power pulse.
Digit. Signal Process.
Volkan Kumbasar, Oguz Kucur
2006 J jnl
Performance of optimum wavelet waveform for DS-CDMA chip waveform over QS-AWGN channel.
Int. J. Commun. Syst.
Ertan Öztürk, Oguz Kucur, Guillermo E. Atkin
2005 J jnl
Performance of Haar wavelet based scale-code division multiple access (HW/S-CDMA) using decorrelating multi-user detector.
Comput. Electr. Eng.
Oguz Kucur, Guillermo E. Atkin
2005 — conf
Performance of rotated phase shift keying modulation over Ricean fading channels.
ISWCS
Serdar Özyurt, Oguz Kucur, Ibrahim Altunbas
2000 Misc conf
A wavelet-based multirate/multimedia system.
ICASSP
Oguz Kucur, Ertan Öztürk, Guillermo E. Atkin
2000 J jnl
Performance of scale-time-code division multiple access over the synchronous AWGN channel.
Int. J. Commun. Syst.
Oguz Kucur, Guillermo E. Atkin
2000 Misc conf
Waveform encoding of binary signals using a wavelet and its Hilbert transform.
ICASSP
Ertan Öztürk, Oguz Kucur, Guillermo E. Atkin