Georgios Karakonstantis

ORCID

Publication Activity (10 Years)

Years Active: 2007-2024
Publications (10 Years): 58

Top Venues

Publications

Hans Jakob Damsgaard, Antoine Grenier, Dewant Katare, Zain Taufique, Salar Shakibhamedan, Tiago Troccoli, Georgios Chatzitsompanis, Anil Kanduri, Aleksandr Ometov, Aaron Yi Ding, Nima Taherinejad, Georgios Karakonstantis, Roger F. Woods, Jari Nurmi
Adaptive approximate computing in edge AI and IoT applications: A review. J. Syst. Archit. 150 (2024)
Charalampos Eleftheriadis, Georgios Chatzitsompanis, Georgios Karakonstantis
Enabling Voltage Over-Scaling in Multiplierless DSP Architectures via Algorithm-Hardware Co-Design. IEEE Trans. Very Large Scale Integr. Syst. 32 (2) (2024)
Charalampos Eleftheriadis, Georgios Karakonstantis
Optimal Adder-Multiplexer Co-Optimization for Time-Multiplexed Multiplierless Architectures. IEEE Trans. Circuits Syst. I Regul. Pap. 70 (9) (2023)
Styliani Tompazi, Georgios Karakonstantis
AI-based Timing Error Modelling: A Case Study on a Pipelined Floating-point Core. ARITH (2023)
Styliani Tompazi, Georgios Karakonstantis
A Compressed and Accurate Sparse Deep Learning-based Workload-Aware Timing Error Model. ICCD (2023)
Styliani Tompazi, Georgios Karakonstantis
Microarchitecture-Aware Timing Error Prediction via Deep Neural Networks. IOLTS (2023)
Georgios Chatzitsompanis, Georgios Karakonstantis
On the Facilitation of Voltage Over-Scaling and Minimization of Timing Errors in Floating-Point Multipliers. IOLTS (2023)
Charalampos Eleftheriadis, Georgios Karakonstantis
ACOR: On the Design of Energy-Efficient Autocorrelation for Emerging Edge Applications. ICCAD (2023)
Charalampos Eleftheriadis, Mario Garrido, Georgios Karakonstantis
Energy-Efficient Short-Time Fourier Transform for Partial Window Overlapping. ISCAS (2023)
Ioannis Tsiokanos, Styliani Tompazi, Giorgis Georgakoudis, Lev Mukhanov, Georgios Karakonstantis
ARETE: Accurate Error Assessment via Machine Learning-Guided Dynamic-Timing Analysis. IEEE Trans. Computers 72 (4) (2023)
Styliani Tompazi, Ioannis Tsiokanos, Jesús Martínez del Rincón, Georgios Karakonstantis
Estimating Code Vulnerability to Timing Errors Via Microarchitecture-Aware Machine Learning. IEEE Des. Test 40 (1) (2023)
Umar Ibrahim Minhas, JunKyu Lee, Lev Mukhanov, Georgios Karakonstantis, Hans Vandierendonck, Roger F. Woods
Increased Leverage of Transprecision Computing for Machine Vision Applications at the Edge. J. Signal Process. Syst. 94 (10) (2022)
Panagiota Nikolaou, Yiannakis Sazeides, Alejandro Lampropulos, Denis Guilhot, Andrea Bartoli, George Papadimitriou, Athanasios Chatzidimitriou, Dimitris Gizopoulos, Konstantinos Tovletoglou, Lev Mukhanov, Georgios Karakonstantis
On the Evaluation of the Total-Cost-of-Ownership Trade-Offs in Edge vs Cloud Deployments: A Wireless-Denial-of-Service Case Study. IEEE Trans. Sustain. Comput. 7 (2) (2022)
Umar Ibrahim Minhas, Roger F. Woods, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Efficient, Dynamic Multi-Task Execution on FPGA-Based Computing Systems. IEEE Trans. Parallel Distributed Syst. 33 (3) (2022)
Charalampos Eleftheriadis, Georgios Karakonstantis
Energy-Efficient Fast Fourier Transform for Real-Valued Applications. IEEE Trans. Circuits Syst. II Express Briefs 69 (5) (2022)
Styliani Tompazi, Ioannis Tsiokanos, Jesús Martínez del Rincón, Lev Mukhanov, Georgios Karakonstantis
Instruction-aware Learning-based Timing Error Models through Significance-driven Approximations. ICCD (2022)
Ioannis Tsiokanos, Jack Miskelly, Chongyan Gu, Máire O'Neill, Georgios Karakonstantis
DTA-PUF: Dynamic Timing-aware Physical Unclonable Function for Resource-constrained Devices. ACM J. Emerg. Technol. Comput. Syst. 17 (3) (2021)
Charalampos Eleftheriadis, Georgios Karakonstantis
Fast and Accurate Power Spectral Analysis of Heart Rate Variability using Fast Gaussian Gridding. CinC (2021)
Alexandra Samsonova, Barry J. Devereux, Georgios Karakonstantis, Lev Mukhanov
A case study on profiling of an EEG-based brain decoding interface on Cloud and Edge servers. CoRR (2021)
Umar Ibrahim Minhas, Lev Mukhanov, Georgios Karakonstantis, Hans Vandierendonck, Roger F. Woods
Leveraging Transprecision Computing for Machine Vision Applications at the Edge. CoRR (2021)
Umar Ibrahim Minhas, Lev Mukhanov, Georgios Karakonstantis, Hans Vandierendonck, Roger F. Woods
Leveraging Transprecision Computing for Machine Vision Applications at the Edge. SiPS (2021)
Lev Mukhanov, Konstantinos Tovletoglou, Hans Vandierendonck, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Revealing DRAM Operating GuardBands Through Workload-Aware Error Predictive Modeling. IEEE Trans. Computers 70 (11) (2021)
Ioannis Tsiokanos, Georgios Karakonstantis
ExHero: Execution History-Aware Error-Rate Estimation in Pipelined Designs. IEEE Micro 41 (1) (2021)
Alexandra Samsonova, Barry J. Devereux, Georgios Karakonstantis, Lev Mukhanov
A case study on profiling of an EEG-based brain decoding interface on Cloud and Edge servers. SmartCloud (2021)
Umar Ibrahim Minhas, Roger F. Woods, Georgios Karakonstantis
Evaluation of Static Mapping for Dynamic Space-Shared Multi-task Processing on FPGAs. J. Signal Process. Syst. 93 (5) (2021)
Ioannis Tsiokanos, George Papadimitriou, Dimitris Gizopoulos, Georgios Karakonstantis
Boosting Microprocessor Efficiency: Circuit- and Workload-Aware Assessment of Timing Errors. IISWC (2021)
Ioannis Tsiokanos, Lev Mukhanov, Giorgis Georgakoudis, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
DEFCON: Generating and Detecting Failure-prone Instruction Sequences via Stochastic Search. DATE (2020)
Lev Mukhanov, Konstantinos Tovletoglou, Hans Vandierendonck, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Workload-Aware DRAM Error Prediction using Machine Learning. CoRR (2020)
Lev Mukhanov, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
DStress: Automatic Synthesis of DRAM Reliability Stress Viruses using Genetic Algorithms. MICRO (2020)
Christos Kalogirou, Christos D. Antonopoulos, Nikolaos Bellas, Spyros Lalis, Lev Mukhanov, Georgios Karakonstantis
Increasing the Profit of Cloud Providers through DRAM Operation at Reduced Margins. CCGRID (2020)
Konstantinos Tovletoglou, Lev Mukhanov, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
HaRMony: Heterogeneous-Reliability Memory and QoS-Aware Energy Management on Virtualized Servers. ASPLOS (2020)
Dimitrios Garyfallou, Ioannis Tsiokanos, Nestor E. Evmorfopoulos, Georgios I. Stamoulis, Georgios Karakonstantis
Accurate Estimation of Dynamic Timing Slacks using Event-Driven Simulation. ISQED (2020)
Umar Ibrahim Minhas, Roger F. Woods, Georgios Karakonstantis
Optimisation of System Throughput Exploiting Tasks Heterogeneity on Space Shared FPGAs. FPT (2019)
Konstantinos Tovletoglou, Lev Mukhanov, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Shimmer: Implementing a Heterogeneous-Reliability DRAM Framework on a Commodity Server. IEEE Comput. Archit. Lett. 18 (1) (2019)
Ioannis Tsiokanos, Lev Mukhanov, Georgios Karakonstantis
Low-Power Variation-Aware Cores based on Dynamic Data-Dependent Bitwidth Truncation. DATE (2019)
Umar Ibrahim Minhas, Roger F. Woods, Georgios Karakonstantis
Design space exploration of multi-task processing on space shared FPGAs: work-in-progress. CODES+ISSS (2019)
Umar Ibrahim Minhas, Roger F. Woods, Georgios Karakonstantis
Evaluation of FPGA Partitioning Schemes for Time and Space Sharing of Heterogeneous Tasks. ARC (2019)
Lev Mukhanov, Konstantinos Tovletoglou, Hans Vandierendonck, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Workload-Aware DRAM Error Prediction using Machine Learning. IISWC (2019)
Konstantinos Tovletoglou, Lev Mukhanov, Georgios Karakonstantis, Athanasios Chatzidimitriou, George Papadimitriou, Manolis Kaliorakis, Dimitris Gizopoulos, Zacharias Hadjilambrou, Yiannakis Sazeides, Alejandro Lampropulos, Shidhartha Das, Phong Vo
Measuring and Exploiting Guardbands of Server-Grade ARMv8 CPU Cores and DRAMs. DSN Workshops (2018)
Umar Ibrahim Minhas, Roger F. Woods, Georgios Karakonstantis
Facilitating Easier Access to FPGAs in the Heterogeneous Cloud Ecosystems. FPL (2018)
Christopher Prentice, Georgios Karakonstantis
Smart Office System with Face Detection at the Edge. SmartWorld/SCALCOM/UIC/ATC/CBDCom/IOP/SCI (2018)
Bin Wang, Hans Vandierendonck, Georgios Karakonstantis, Dimitrios S. Nikolopoulos
Userspace Hypervisor Data Characterization in Virtualized Environment. ICPADS (2018)
Georgios Karakonstantis, Konstantinos Tovletoglou, Lev Mukhanov, Hans Vandierendonck, Dimitrios S. Nikolopoulos, Peter Lawthers, Panos K. Koutsovasilis, Manolis Maroudas, Christos D. Antonopoulos, Christos Kalogirou, Nikolaos Bellas, Spyros Lalis, Srikumar Venugopal, Arnau Prat-Pérez, Alejandro Lampropulos, Marios Kleanthous, Andreas Diavastos, Zacharias Hadjilambrou, Panagiota Nikolaou, Yiannakis Sazeides, Pedro Trancoso, George Papadimitriou, Manolis Kaliorakis, Athanasios Chatzidimitriou, Dimitris Gizopoulos, Shidhartha Das
An energy-efficient and error-resilient server ecosystem exceeding conservative scaling limits. DATE (2018)
Charalampos Chalios, Giorgis Georgakoudis, Konstantinos Tovletoglou, Georgios Karakonstantis, Hans Vandierendonck, Dimitrios S. Nikolopoulos
DARE. Int. J. High Perform. Comput. Appl. 32 (1) (2018)
Ioannis Tsiokanos, Lev Mukhanov, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Minimization of Timing Failures in Pipelined Designs via Path Shaping and Operand Truncation. IOLTS (2018)
Lev Mukhanov, Konstantinos Tovletoglou, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
DRAM Characterization under Relaxed Refresh Period Considering System Level Effects within a Commodity Server. IOLTS (2018)
Ioannis Tsiokanos, Lev Mukhanov, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Variation-Aware Pipelined Cores through Path Shaping and Dynamic Cycle Adjustment: Case Study on a Floating-Point Unit. ISLPED (2018)
Lev Mukhanov, Konstantinos Tovletoglou, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Characterization of HPC workloads on an ARMv8 based server under relaxed DRAM refresh and thermal stress. SAMOS (2018)
Konstantinos Tovletoglou, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Access-aware DRAM failure-rate estimation under relaxed refresh operations. SAMOS (2017)
Georgios Karakonstantis, Dimitrios S. Nikolopoulos, Dimitris Gizopoulos, Pedro Trancoso, Yiannakis Sazeides, Christos D. Antonopoulos, Srikumar Venugopal, Shidhartha Das
Error-Resilient Server Ecosystems for Edge and Cloud Datacenters. Computer 50 (12) (2017)
Kiril Dichev, Herbert Jordan, Konstantinos Tovletoglou, Thomas Heller, Dimitrios S. Nikolopoulos, Georgios Karakonstantis, Charles Gillan
Dependency-Aware Rollback and Checkpoint-Restart for Distributed Task-Based Runtimes. CoRR (2017)
Konstantinos Tovletoglou, Dimitrios S. Nikolopoulos, Georgios Karakonstantis
Relaxing DRAM refresh rate through access pattern scheduling: A case study on stencil-based algorithms. IOLTS (2017)
Chhaya Trehan, Hans Vandierendonck, Georgios Karakonstantis, Dimitrios S. Nikolopoulos
Energy Optimization of Memory Intensive Parallel workloads. CoRR (2016)
Christian Senning, Georgios Karakonstantis, Andreas Burg
Cross-Layer Energy-Efficiency Optimization of Packet Based Wireless MIMO Communication Systems. J. Signal Process. Syst. 85 (1) (2016)
Zheng Wang, Georgios Karakonstantis, Anupam Chattopadhyay
A low overhead error confinement method based on application statistical characteristics. DATE (2016)
Jeremy Constantin, Andreas Peter Burg, Zheng Wang, Anupam Chattopadhyay, Georgios Karakonstantis
Statistical fault injection for impact-evaluation of timing errors on application performance. DAC (2016)
Chhaya Trehan, Hans Vandierendonck, Georgios Karakonstantis, Dimitrios S. Nikolopoulos
Brief Announcement: Energy Optimization of Memory Intensive Parallel Workloads. SPAA (2016)
Soumya Basu, Pablo García Del Valle, Georgios Karakonstantis, Giovanni Ansaloni, Laura Pozzi, David Atienza
Inexact-aware architecture design for ultra-low power bio-signal analysis. IET Comput. Digit. Tech. 10 (6) (2016)
Soumya Basu, Pablo García Del Valle, Georgios Karakonstantis, Giovanni Ansaloni, David Atienza
Heterogeneous Error-Resilient Scheme for Spectral Analysis in Ultra-Low Power Wearable Electrocardiogram Devices. ISVLSI (2015)
Charalampos Antoniadis, Georgios Karakonstantis, Nestor E. Evmorfopoulos, Andreas Peter Burg, George I. Stamoulis
On the statistical memory architecture exploration and optimization. DATE (2015)
Christian Senning, Georgios Karakonstantis, Andreas Burg
Cross-layer Energy-Efficiency Optimization of Packet Based Wireless MIMO Communication Systems. CoRR (2015)
Jeremy Constantin, Lai Wang, Georgios Karakonstantis, Anupam Chattopadhyay, Andreas Burg
Exploiting dynamic timing margins in microprocessors for frequency-over-scaling with instruction-based clock adjustment. DATE (2015)
Shrikanth Ganapathy, Adam Teman, Robert Giterman, Andreas Burg, Georgios Karakonstantis
Approximate computing with unreliable dynamic memories. NEWCAS (2015)
Pascal Andreas Meinerzhagen, Andrea Bonetti, Georgios Karakonstantis, Christoph Roth, Frank Giirkaynak, Andreas Peter Burg
Refresh-free dynamic standard-cell based memories: Application to a QC-LDPC decoder. ISCAS (2015)
Jiandong Mu, Aida Vosoughi, João Andrade, Alexios Balatsoukas-Stimming, Georgios Karakonstantis, Andreas Burg, Gabriel Falcão, Vítor Manuel Mendes da Silva, Joseph R. Cavallaro
The impact of faulty memory bit cells on the decoding of spatially-coupled LDPC codes. ACSSC (2015)
Muhsen Owaida, Gabriel Falcão, João Andrade, Christos D. Antonopoulos, Nikolaos Bellas, Madhura Purnaprajna, David Novo, Georgios Karakonstantis, Andreas Burg, Paolo Ienne
Enhancing Design Space Exploration by Extending CPU/GPU Specifications onto FPGAs. ACM Trans. Embed. Comput. Syst. 14 (2) (2015)
Shrikanth Ganapathy, Georgios Karakonstantis, Adam Teman, Andreas Burg
Mitigating the impact of faults in unreliable memories for error-resilient applications. DAC (2015)
Adam Teman, Georgios Karakonstantis, Robert Giterman, Pascal Andreas Meinerzhagen, Andreas Peter Burg
Energy versus data integrity trade-offs in embedded high-density logic compatible dynamic memories. DATE (2015)
João Andrade, Aida Vosoughi, Guohui Wang, Georgios Karakonstantis, Andreas Burg, Gabriel Falcão, Vítor Manuel Mendes da Silva, Joseph R. Cavallaro
On the performance of LDPC and turbo decoder architectures with unreliable memories. ACSSC (2014)
Alexios Balatsoukas-Stimming, Georgios Karakonstantis, Andreas Burg
Enabling complexity-performance trade-offs for successive cancellation decoding of polar codes. ISIT (2014)
Georgios Karakonstantis, Aviinaash Sankaranarayanan, Mohamed M. Sabry, David Atienza, Andreas Burg
A quality-scalable and energy-efficient approach for spectral analysis of heart rate variability. DATE (2014)
Dimitrios S. Nikolopoulos, Hans Vandierendonck, Nikolaos Bellas, Christos D. Antonopoulos, Spyros Lalis, Georgios Karakonstantis, Andreas Burg, Uwe Naumann
Energy Efficiency through Significance-Based Computing. Computer 47 (7) (2014)
Farshad Moradi, Georgios Panagopoulos, Georgios Karakonstantis, Hooman Farkhani, Dag T. Wisland, Jens Kargaard Madsen, Hamid Mahmoodi, Kaushik Roy
Multi-level wordline driver for robust SRAM design in nano-scale CMOS technology. Microelectron. J. 45 (1) (2014)
Christoph Roth, Christoph Studer, Georgios Karakonstantis, Andreas Burg
Statistical data correction for unreliable memories. ACSSC (2014)
Alexios Balatsoukas-Stimming, Georgios Karakonstantis, Andreas Burg
Enabling Complexity-Performance Trade-Offs for Successive Cancellation Decoding of Polar Codes. CoRR (2013)
Georgios Karakonstantis, David Atienza, Andy Burg
Exploiting application resiliency for energy-efficient and adequately-reliable operation. IOLTS (2013)
Mohamed M. Sabry, Georgios Karakonstantis, David Atienza, Andreas Burg
Design of energy efficient and dependable health monitoring systems under unreliable nanometer technologies. BODYNETS (2012)
Georgios Karakonstantis, Christoph Roth, Christian Benkeser, Andreas Burg
On the exploitation of the inherent error resilience of wireless systems under unreliable silicon. DAC (2012)
Christoph Roth, Christian Benkeser, Christoph Studer, Georgios Karakonstantis, Andreas Burg
Data mapping for unreliable memories. Allerton Conference (2012)
Georgios Karakonstantis, Debabrata Mohapatra, Kaushik Roy
Logic and Memory Design Based on Unequal Error Protection for Voltage-scalable, Robust and Adaptive DSP Systems. J. Signal Process. Syst. 68 (3) (2012)
Christoph Roth, Christian Benkeser, Christoph Studer, Georgios Karakonstantis, Andreas Burg
Data Mapping for Unreliable Memories CoRR (2012)
Gabriel Falcão, Muhsen Owaida, David Novo, Madhura Purnaprajna, Nikolaos Bellas, Christos D. Antonopoulos, Georgios Karakonstantis, Andreas Burg, Paolo Ienne
Shortening Design Time through Multiplatform Simulations with a Portable OpenCL Golden-model: The LDPC Decoder Case. FCCM (2012)
Georgios Karakonstantis, Kaushik Roy
Voltage over-scaling: A cross-layer design perspective for energy efficient systems. ECCTD (2011)
Georgios Karakonstantis, Abhijit Chatterjee, Kaushik Roy
Containing the Nanometer "Pandora-Box": Cross-Layer Design Techniques for Variation Aware Low Power Systems. IEEE J. Emerg. Sel. Topics Circuits Syst. 1 (1) (2011)
Georgios Karakonstantis, Nikolaos Bellas, Christos D. Antonopoulos, Georgios Tziantzioulis, Vaibhav Gupta, Kaushik Roy
Significance driven computation on next-generation unreliable platforms. DAC (2011)
Farshad Moradi, Georgios Panagopoulos, Georgios Karakonstantis, Dag T. Wisland, Hamid Mahmoodi, Jens Kargaard Madsen, Kaushik Roy
Multi-level wordline driver for low power SRAMs in nano-scale CMOS technology. ICCD (2011)
Swaroop Ghosh, Debabrata Mohapatra, Georgios Karakonstantis, Kaushik Roy
Voltage Scalable High-Speed Robust Hybrid Arithmetic Units Using Adaptive Clocking. IEEE Trans. Very Large Scale Integr. Syst. 18 (9) (2010)
Farshad Moradi, Charles Augustine, Ashish Goel, Georgios Karakonstantis, Tuan Vu Cao, Dag T. Wisland, Hamid Mahmoodi, Kaushik Roy
Data-dependant sense-amplifier flip-flop for low power applications. CICC (2010)
Himanshu Markandeya, Georgios Karakonstantis, Shriram Raghunathan, Pedro P. Irazoqui, Kaushik Roy
Low-power DWT-based quasi-averaging algorithm and architecture for epileptic seizure detection. ISLPED (2010)
Georgios Karakonstantis, Charles Augustine, Kaushik Roy
A self-consistent model to estimate NBTI degradation and a comprehensive on-line system lifetime enhancement technique. IOLTS (2010)
Vaibhav Gupta, Georgios Karakonstantis, Debabrata Mohapatra, Kaushik Roy
VEDA: Variation-aware energy-efficient Discrete Wavelet Transform architecture. ICCD (2010)
Georgios Karakonstantis, Georgios Panagopoulos, Kaushik Roy
HERQULES: system level cross-layer design exploration for efficient energy-quality trade-offs. ISLPED (2010)
Georgios Karakonstantis, Nilanjan Banerjee, Kaushik Roy
Process-Variation Resilient and Voltage-Scalable DCT Architecture for Robust Low-Power Computing. IEEE Trans. Very Large Scale Integr. Syst. 18 (10) (2010)
Nilanjan Banerjee, Georgios Karakonstantis, Jung Hwan Choi, Chaitali Chakrabarti, Kaushik Roy
Design Methodology for Low Power and Parametric Robustness Through Output-Quality Modulation: Application to Color-Interpolation Filtering. IEEE Trans. Comput. Aided Des. Integr. Circuits Syst. 28 (8) (2009)
Georgios Karakonstantis, Debabrata Mohapatra, Kaushik Roy
System level DSP synthesis using voltage overscaling, unequal error protection & adaptive quality tuning. SiPS (2009)
Debabrata Mohapatra, Georgios Karakonstantis, Kaushik Roy
Significance driven computation: a voltage-scalable, variation-aware, quality-tuning motion estimator. ISLPED (2009)
Nilanjan Banerjee, Georgios Karakonstantis, Kaushik Roy
Process variation tolerant low power DCT architecture. DATE (2007)
Georgios Karakonstantis, Kaushik Roy
An Optimal Algorithm for Low Power Multiplierless FIR Filter Design using Chebychev Criterion. ICASSP (2) (2007)
Debabrata Mohapatra, Georgios Karakonstantis, Kaushik Roy
Low-power process-variation tolerant arithmetic units using input-based elastic clocking. ISLPED (2007)
Georgios Karakonstantis, Nilanjan Banerjee, Kaushik Roy, Chaitali Chakrabarti
Design methodology to trade off power, output quality and error resiliency: application to color interpolation filtering. ICCAD (2007)

Georgios Karakonstantis.css-eqlu8i{font-size:small;padding-left:4px;}

Publication Activity (10 Years)

Top Topics

Top Venues

Georgios Karakonstantis