index.json

[{"authors":null,"categories":null,"content":"I am a Ph.D. student at the Extreme Computing Research Center of King Abdullah University of Science and Technology (KAUST). I work under the supervision of David E. Keyes. Currently, I focus on High Performance Computing aspects of a high-order, h/p/r-adaptive CFD framework.\nAfter six years with the Computational Modeling Team of Saudi Aramco, I have extensive experience with performance modeling, scalability, communication, and load balancing of HPC applications.\n Download my resumé. -- ","date":1607385600,"expirydate":-62135596800,"kind":"term","lang":"en","lastmod":1607385600,"objectID":"2525497d367e79493fd32b198b28f040","permalink":"","publishdate":"0001-01-01T00:00:00Z","relpermalink":"","section":"authors","summary":"I am a Ph.D. student at the Extreme Computing Research Center of King Abdullah University of Science and Technology (KAUST). I work under the supervision of David E. Keyes. Currently, I focus on High Performance Computing aspects of a high-order, h/p/r-adaptive CFD framework.","tags":null,"title":"Marcin Rogowski","type":"authors"},{"authors":null,"categories":null,"content":"I first became interested in High Performance Computing in 2011 during my M.S. coursework. After a brief Human-Computer Interaction episode, I returned to HPC in 2014 and have worked in this field ever since. Between 2014 and 2019, I worked on Saudi Aramco\u0026rsquo;s reservoir simulator - GigaPOWERS and had the chance to lead the performance optimization efforts. During that time, I had the opportunity to run on several TOP500-ranked supercomputers and achieve a few milestones: evaluate the scalability up to 196'608 cores back in 2017, and was involved in record-setting 1-billion-cell simulations.\nAs part of those projects, I gained extensive experience with domain partitioning, matrix-vector multiplication optimization, MPI and OpenMP, fast compression algorithms, MPI tuning and asynchronous I/O.\nFrom 2020, I started to work on an h/p/r-adaptive framework developed at KAUST\u0026rsquo;s AANSLab used to simulate turbulent compressible internal and external flows on unstructured grids for industrial applications. I focus on the solver\u0026rsquo;s performance, communication, and scalability.\n","date":1625011200,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1625011200,"objectID":"4ad9483811836389d75e55c8ef4ed7aa","permalink":"https://mrogowski.github.io/project/hpc/","publishdate":"2021-06-30T00:00:00Z","relpermalink":"/project/hpc/","section":"project","summary":"Reservoir Simulation and Computational Fluid Dynamics at scale","tags":["high performance computing"],"title":"High Performance Computing","type":"project"},{"authors":null,"categories":null,"content":"Starting during my internship at the California Institute for Telecommunications and Information Technology (Calit2) at University of California, San Diego, I became interested in Human-Computer Interaction. My first project was to use Microsoft Kinect for gesture navigation, head and hand tracking in 3D caves with the application to digital archeology. Back at KAUST, I continued this project and started working with the Visualization Core Lab on the visualization of large biological data sets, interaction, and selection.\nOnce I moved to Saudi Aramco in 2013, I continued research in similar areas. In the Hyper-Dimensional Simulator project, we evaluated different interaction techniques with big data originating from reservoir simulation. In our project with Oblong, we focused on gesture control. Together, we assessed a range of technologies: Vicon motion capture cameras, Novint Falcon\u0026rsquo;s haptic device, 3D mouse, Leap Motion, Microsoft Kinect, etc. Our product was presented to high local government officials, company representatives as well as the general public.\n","date":1625011200,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1625011200,"objectID":"bc3c2985cf1d61a63db0824dbf62d2a2","permalink":"https://mrogowski.github.io/project/hci/","publishdate":"2021-06-30T00:00:00Z","relpermalink":"/project/hci/","section":"project","summary":"Gesture control in 3D caves and in reservoir management","tags":["human-computer interaction"],"title":"Human-Computer Interaction","type":"project"},{"authors":null,"categories":null,"content":"Starting in 2008, as a second-year Computer Science B.Sc. student at the Bialystok University of Technology, I started working on keystroke dynamics with Prof. Khalid Saeed. Keystroke dynamics is one of the biometric methods that can be used to authenticate or identify users. The method falls under behavioral features and is based on how a user performs specific tasks - in this case - how the user types on a keyboard. The typing style was shown to differentiate well between users.\nThe idea first came as early as 1975 when it was mentioned by R. J. Spillane and has since then been modified and improved on multiple occasions with the results reported as high as 99-100% correct classification. The method can be used for both authentication (strengthening the password or continuously verifying the user\u0026rsquo;s identity) or identification (determining the user based on his typing style).\nMy work started by analyzing the impact of the database quality on the method\u0026rsquo;s efficiency and continued with the implementation of a JavaScript-based website to collect experimental data. My most significant contributions, however, were in the area of user authentication on mobile devices. Back in 2012, when smartphones started rapidly gaining popularity, I researched authentication methods on mobile devices and proposed keystroke dynamics as one of the solutions. I then implemented a custom Android keyboard that collected extra information from the touchscreen and the gyroscope as users were typing. The resulting ensemble of data from different sensors showed promising results.\n","date":1624924800,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1624924800,"objectID":"f1fbbff2982fbf4d6d3783376e271cb7","permalink":"https://mrogowski.github.io/project/biometrics/","publishdate":"2021-06-29T00:00:00Z","relpermalink":"/project/biometrics/","section":"project","summary":"Keystroke dynamics allows authenticating users based on their typing patterns","tags":["biometrics"],"title":"Biometrics","type":"project"},{"authors":null,"categories":null,"content":"Towards the end of my M.S. studies, in 2012-2013, Saad Al-Rawaf (now the founder of CloudToday) and I ventured into mobile app development. One of the more successful attempts was Rethink - a new take on task management.\nOur differentiator was the introduction of trigger-based tasks - reminders that were not activated by date and time but by location, contact with a particular person, or a fact of being connected to a specific WiFi network. While we did not continue the development past 2014, in some terms, our venture was successful. With around 30,000 users, we were featured by major media outlets such as The Washington Post, The Guardian, Stuff, All About Android and others. Similar functionality has since been incorporated in applications such as Apple\u0026rsquo;s Reminders and Google Keep.\n\n","date":1625097600,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1625097600,"objectID":"df3d889b16ce835326844a47c85b6ae0","permalink":"https://mrogowski.github.io/project/mobile_app/","publishdate":"2021-07-01T00:00:00Z","relpermalink":"/project/mobile_app/","section":"project","summary":"Android application development","tags":["mobile"],"title":"Mobile App Development","type":"project"},{"authors":["Suha Kayum","Marcin Rogowski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1607385600,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1607385600,"objectID":"2a86f85e856dd7856f9a948e86326081","permalink":"https://mrogowski.github.io/publication/2020_eage_well_assignment/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2020_eage_well_assignment/","section":"publication","summary":"Load balancing poses a challenge to massively parallel reservoir simulation. Inefficient work distribution impedes scalability and leads to inefficient use of computing resources. Rather than addressing the more popular - and admittedly more important - topic of grid partitioning, this paper delves into the problem of the assignment of wells to processes. In the presented method, well activity mask is first obtained using a proxy model. Using this information, the well assignment task is translated to a bin packing problem and First Fit Decreasing algorithm is applied. Depending on the percentage of the simulation time that an average well is active, the results show between 8.2% and 73.8% improvement in terms of the number of bins. The number of bins is directly correlated with the maximum number of processes that can be assigned at most one well at a time which is beneficial in scenarios where the number of wells is greater than the number of processes assigned to the simulation run.","tags":[],"title":"Efficient Static Well Assignment in Parallel Reservoir Simulation","type":"publication"},{"authors":["Suha Kayum","Marcin Rogowski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1607385600,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1607385600,"objectID":"8d2fcafa96c1a786916710999693c69a","permalink":"https://mrogowski.github.io/publication/2020_eage_guided_dt/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2020_eage_guided_dt/","section":"publication","summary":"In this work, a look-ahead timestep size selection method is introduced, which uses smaller coarsened proxy models to guide the timestep selection of the original high-fidelity model. This work capitalizes on the coarsening of models that retain the main characteristics of the simulation run, where a coarsened model is generated and is run simultaneously with a fine-grid simulation run. The timestep size chosen for the proxy model is used to guide the timestep selection of the fine-grid model. The look-ahead method of utilizing the coarsened model results in a reduction of the timestep cuts in the fine-grid simulation run that would have otherwise occurred. The proposed method has been tested on several synthetic and real-field reservoir models and shown to result in a reduced number of timestep cuts based on the input from the coarsened model. A significant reduction of timestep cuts results in computational cost savings and enhanced runtime as wasted Newtonian and linear iterations are avoided.","tags":[],"title":"Runtime Optimization of a Massively Parallel Reservoir Simulator Using Guided Timestep Selection","type":"publication"},{"authors":["Marcin Rogowski","Suha Kayum"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1573430400,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1573430400,"objectID":"9e90aa4b5050b2aa60f9769c8955bb36","permalink":"https://mrogowski.github.io/publication/2019_hpc_adipec_sectors/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_adipec_sectors/","section":"publication","summary":"Reservoir simulation models that represent large-sized reservoirs require significant use of High-Performance Computing resources. Several solutions aim to reduce the load of an individual simulation such as upscaling to consequently reduce the number of grid cells of the model, splitting the model into independent sub-models using crop functionality, or dividing the model into sectors and running these sub-models independently. As it preserves the flux boundary condition, sector modeling could potentially result in the least erroneous solution, especially if the sectors are defined on the regions of least connectivity.","tags":[],"title":"Intelligent Identification of Least-Connected Components of Reservoir Simulation Models","type":"publication"},{"authors":["Suha Kayum","Marcin Rogowski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1570406400,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1570406400,"objectID":"0b1721262cd434d9837d42b909a63d62","permalink":"https://mrogowski.github.io/publication/2019_hpc_eagehpc_cloud/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_eagehpc_cloud/","section":"publication","summary":"This paper seeks to focus on the O\u0026G industry and the transition of their HPC applications to cloud platforms effectively by providing two assessment methods for HPC applications in the cloud. A new assessment tool is used to aid in assessing HPC applications’ feasibility and advantage of use in the cloud and is used in assessing the migration of reservoir simulation activities to the cloud.","tags":[],"title":"High-performance computing applications transition to the cloud in upstream","type":"publication"},{"authors":["Marcin Rogowski","Suha Kayum","Florian Mannuss"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1570406400,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1570406400,"objectID":"de2829549c41e6b703dfb2dc962d2866","permalink":"https://mrogowski.github.io/publication/2019_hpc_eagehpc_compression/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_eagehpc_compression/","section":"publication","summary":"Restart files are simulator’s internal files that are a binary representation of the reservoir state at a chosen time and can be used by the simulator’s end users to resume the simulation from an arbitrary point in time. The size of restart files could reach hundreds of gigabytes and require high storage capacity. In this paper, the lossless compression of an in-house reservoir simulator’s internal restart files is explored and its advantages are shared.","tags":[],"title":"Incorporating Lossless Compression in Parallel Reservoir Simulation","type":"publication"},{"authors":["Marcin Rogowski","Suha Kayum"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1569283200,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1569283200,"objectID":"1b4b4a6cd51fdbf7217730d81ec32b13","permalink":"https://mrogowski.github.io/publication/2019_hpc_hpec_imbalance/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_hpec_imbalance/","section":"publication","summary":"Load balancing is a crucial factor affecting the performance of parallel applications. Improper work distribution leads to underutilization of computing resources and an unnecessary increase in runtime. This paper identifies the imbalance sources in reservoir simulation and characterizes them as static or dynamic. Simulation model properties that change over time, such as well management actions, are registered and correlated with performance characteristics hence identifying sources of imbalance. The results are exploratory and used to validate the current approach of static grid-to-process, and well-to-process assignment widely used in commercial parallel reservoir simulators. Areas in which implementing dynamic load balancing would be worthwhile are identified.","tags":[],"title":"Evaluation of the Imbalance Evolution in Parallel Reservoir Simulation","type":"publication"},{"authors":["Suha Kayum","Marcin Rogowski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1569283200,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1569283200,"objectID":"158e50e7af4c87952af487a283c985c1","permalink":"https://mrogowski.github.io/publication/2019_hpc_hpec_cloud/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_hpec_cloud/","section":"publication","summary":"\"In the cloud platform, High-Performance\nComputing (HPC) is meant to provide the capability of scaling to\nlarge numbers of tasks that run in parallel on-demand. However,\nit remains a dilemma for companies in the Oil \u0026 Gas (O\u0026G)\nindustry whether to transition HPC activities to the cloud or not.\nIn this paper, the latest research studies are shared that shed\nlight on some of the challenges and outlooks prevailing. The\nchoice of which HPC applications should migrate to the cloud is\nshown to be application dependent and will be demonstrated in\nthis paper with a case study assessing migrating reservoir\nsimulation activity to the cloud. It is evident that a hybrid cloud\nsolution for high-performance computing is a good starting\npoint, as it mitigates a few challenges that entities in the O\u0026G\nindustry face today.\"","tags":[],"title":"High-Performance Computing Applications’ Transition to the Cloud in the Oil \u0026 Gas Industry","type":"publication"},{"authors":["Marcin Rogowski","Suha Kayum","Florian Mannuss"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1569283200,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1569283200,"objectID":"43a570517189108dfab7cfebce5b4685","permalink":"https://mrogowski.github.io/publication/2019_hpc_hpec_compression/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_hpec_compression/","section":"publication","summary":"In parallel reservoir simulation, massively sized files are written recurrently throughout a simulation run. A method is developed to compress the distributed data to be written during the simulation run and to output it to a single compressed file. Evaluation of several compression algorithms on a range of simulation models is performed. The presented method results in 3x file size reduction and a decrease in the total application runtime.","tags":[],"title":"Lossless Compression of Internal Files in Parallel Reservoir Simulation","type":"publication"},{"authors":["Suha Kayum","Marcin Rogowski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1569283200,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1569283200,"objectID":"3cbb715ebdfb52bd117845a00c1b1f39","permalink":"https://mrogowski.github.io/publication/2019_hpc_hpec_allocation/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_hpec_allocation/","section":"publication","summary":"Over the past few decades, the oil and gas (O\u0026G) industry has become heavily dependent on parallel scientific computing. The turnaround time of such applications depends heavily on the amount of resources dedicated to the task. Increasing the number of compute processes for the same job tends to produce diminishing returns, and does not always guarantee an increase in performance of a justified impact. This point describes scalability limits, which this work aims to avoid surpassing. An algorithm is presented in which a reservoir simulation run automatically adjusts and finds the optimal resources, which leads to improved performance, and the efficient utilization of compute resources, resulting in significant cost savings.","tags":[],"title":"Optimal Resource Allocation for Parallel Reservoir Simulation","type":"publication"},{"authors":["Suha Kayum","Michel Cancelliere","Marcin Rogowski","Ahmed Al-Zawawi"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1559520000,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1559520000,"objectID":"b8e556ac15e3c218692753600218464d","permalink":"https://mrogowski.github.io/publication/2019_hpc_europec_amg/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2019_hpc_europec_amg/","section":"publication","summary":"Algebraic Multigrid (AMG) methods have proven to be efficient when numerically solving elliptic Partial Differential Equations (PDE). In reservoir simulation, AMG is used together with the Constrained Pressure Residual (CPR) method to solve a partially decoupled pressure system. Recently, effort has been focused on improving the robustness of the AMG-CPR solver. This paper presents the performance of different AMG-CPR strategies for massive reservoir models. In addition, a solver selection analysis is conducted, proving that dynamic selection of solvers has the potential of increasing the overall efficiency and robustness of the simulation.","tags":[],"title":"Application of Algebraic Multigrid in Fully Implicit Massive Reservoir Simulations","type":"publication"},{"authors":[],"categories":[],"content":"Create slides in Markdown with Wowchemy Wowchemy | Documentation\n Features  Efficiently write slides in Markdown 3-in-1: Create, Present, and Publish your slides Supports speaker notes Mobile friendly slides   Controls  Next: Right Arrow or Space Previous: Left Arrow Start: Home Finish: End Overview: Esc Speaker notes: S Fullscreen: F Zoom: Alt + Click PDF Export: E   Code Highlighting Inline code: variable\nCode block:\nporridge = \u0026quot;blueberry\u0026quot; if porridge == \u0026quot;blueberry\u0026quot;: print(\u0026quot;Eating...\u0026quot;)   Math In-line math: $x + y = z$\nBlock math:\n$$ f\\left( x \\right) = ;\\frac{{2\\left( {x + 4} \\right)\\left( {x - 4} \\right)}}{{\\left( {x + 4} \\right)\\left( {x + 1} \\right)}} $$\n Fragments Make content appear incrementally\n{{% fragment %}} One {{% /fragment %}} {{% fragment %}} **Two** {{% /fragment %}} {{% fragment %}} Three {{% /fragment %}}  Press Space to play!\nOne  Two  Three \n A fragment can accept two optional parameters:\n class: use a custom style (requires definition in custom CSS) weight: sets the order in which a fragment appears   Speaker Notes Add speaker notes to your presentation\n{{% speaker_note %}} - Only the speaker can read these notes - Press `S` key to view {{% /speaker_note %}}  Press the S key to view the speaker notes!\n Only the speaker can read these notes Press S key to view    Themes  black: Black background, white text, blue links (default) white: White background, black text, blue links league: Gray background, white text, blue links beige: Beige background, dark text, brown links sky: Blue background, thin dark text, blue links    night: Black background, thick white text, orange links serif: Cappuccino background, gray text, brown links simple: White background, black text, blue links solarized: Cream-colored background, dark green text, blue links   Custom Slide Customize the slide style and background\n{{\u0026lt; slide background-image=\u0026quot;/media/boards.jpg\u0026quot; \u0026gt;}} {{\u0026lt; slide background-color=\u0026quot;#0000FF\u0026quot; \u0026gt;}} {{\u0026lt; slide class=\u0026quot;my-style\u0026quot; \u0026gt;}}   Custom CSS Example Let\u0026rsquo;s make headers navy colored.\nCreate assets/css/reveal_custom.css with:\n.reveal section h1, .reveal section h2, .reveal section h3 { color: navy; }   Questions? Ask\nDocumentation\n","date":1549324800,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1549324800,"objectID":"0e6de1a61aa83269ff13324f3167c1a9","permalink":"https://mrogowski.github.io/slides/example/","publishdate":"2019-02-05T00:00:00Z","relpermalink":"/slides/example/","section":"slides","summary":"An introduction to using Wowchemy's Slides feature.","tags":[],"title":"Slides","type":"slides"},{"authors":["Amani AlOnazi","Marcin Rogowski","Ahmed Al-Zawawi","David Keyes"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1537833600,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1537833600,"objectID":"ddcb1c9315171ca366284ed3821b4a0d","permalink":"https://mrogowski.github.io/publication/2018_hpc_hpec_hybrid/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2018_hpc_hpec_hybrid/","section":"publication","summary":"Two trends are reshaping the landscape of petroleum reservoir simulators, one architecturally and one application driven: an increasing number of cores per node and increasing computational intensity arising from higher fidelity physics at each cell. Implicit algebraic solvers being the dominant kernels, we present hybrid MPI and OpenMP implementations of the linear solver of GigaPOWERS, a full-scale real-world massively parallel simulator for black oil and composition models. We also evaluate the impact of explicit communication and computation overlap by including the halo exchange in the task-dependency graph. We analyze the performance of these modifications across multi- and many-core architectures, i.e., Intel Haswell, Skylake, and Knights Landing, using a variety of synthetic and real-world models. The hybrid approach results in up to 50% reduction of time to solution on a 16 million-cell SPE10-like …","tags":[],"title":"Performance Assessment of Hybrid Parallelism for Large-Scale Reservoir Simulation on Multi-and Many-core Architectures","type":"publication"},{"authors":["Piotr Panasiuk","Mariusz Rybnik","Khalid Saeed","Marcin Rogowski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1465344000,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1465344000,"objectID":"c414a8f71aab54de8fcef92b773b583c","permalink":"https://mrogowski.github.io/publication/2016_biometrics_quality/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2016_biometrics_quality/","section":"publication","summary":"This paper concerns keystroke dynamics, also partially in the context of touchscreen devices. The authors concentrate on the impact of database quality and propose their algorithm to test database quality issues. The algorithm is used on their own as well as the well-known . Following specific problems were researched: classification accuracy, development of user typing proficiency, time precision during sample acquisition, representativeness of training set, sample length.","tags":[],"title":"The impact of database quality on keystroke dynamics authentication","type":"publication"},{"authors":["Marcin Rogowski","Khalid Saeed","Mariusz Rybnik","Marek Tabedzki","Marcin Adamski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1380067200,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1380067200,"objectID":"a0b5359062c4ae6971f7f4a1995c667e","permalink":"https://mrogowski.github.io/publication/2013_biometrics_mobile/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2013_biometrics_mobile/","section":"publication","summary":"The paper is intended as a short review of user authentication problem for mobile devices. The emphasis is put on smartphones and tablets, that nowadays are very similar to miniaturized personal computers with much more sensors of various origin. The sensors are described with remarks on their usefulness for user authentication. Deficiencies of traditional user authentication methods based on knowledge are pointed out and the need for new – more secure but also comfortable – user authentication mechanisms is reasoned. Preliminary user authentication systems employing biometric features are discussed and hence the generally unused potential of biometrics for mobile devices is demonstrated.","tags":[],"title":"User authentication for mobile devices","type":"publication"},{"authors":["Marcin Rogowski","Carlo V. Cannistraci","Gregorio Alanis-Lobato","Philip Weber","Timothy Ravasi","Jurgen Schulze","Daniel Acevedo-Feliz"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1363392000,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1363392000,"objectID":"94bdddb53bd349674e7c47d1443f7adb","permalink":"https://mrogowski.github.io/publication/2013_hci_poster/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2013_hci_poster/","section":"publication","summary":"We have been confronted with a real-world problem of visualizing and observing change of gene expression between different human tissues. In this paper, we are presenting a universal representation space based on two-dimensional gel electrophoresis as opposed to force-directed layouts encountered most often in similar problems. We are discussing the methods we devised to make observing change more convenient in a 3D virtual reality environment.","tags":[],"title":"Observing change in crowded data sets in 3D space-Visualizing gene expression in human tissues","type":"publication"},{"authors":["Mariusz Rybnik","Piotr Panasiuk","Khalid Saeed","Marcin Rogowski"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1348617600,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1348617600,"objectID":"ab0c2c42c83ed4917b5b00b81c591280","permalink":"https://mrogowski.github.io/publication/2012_biometrics_advances/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2012_biometrics_advances/","section":"publication","summary":"This paper concerns database quality in the Keystroke Dynamics domain. The authors present their own algorithm and test it using two databases: the authors’ own KDS database and Keystroke Dynamics - Benchmark Data Set online database. Following problems are studied theoretically and experimentally: classification accuracy, database representativeness, increase in typing proficiency and finally: time precision in samples acquisition. Results show that the impact of the database uniqueness on the experimental results is substantial and should not be disregarded in classification algorithm evaluation.","tags":[],"title":"Advances in the keystroke dynamics: the practical impact of database quality","type":"publication"},{"authors":["Marcin Rogowski","Khalid Saeed"],"categories":null,"content":" Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.   --  Create your slides in Markdown - click the Slides button to check out the example.   -- ","date":1348272000,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":1348272000,"objectID":"ef321f283617c55a9ff8251176997336","permalink":"https://mrogowski.github.io/publication/2012_biometrics_touch_screen/","publishdate":"2017-01-01T00:00:00Z","relpermalink":"/publication/2012_biometrics_touch_screen/","section":"publication","summary":"The focus of this chapter is on security of touch screen devices. The emphasis is placed on smartphones – such as Apple iPhone and Android phones – and tablets – such as Apple iPad. The chapter starts with the description how the touch screen devices are winning a significant share in the market. The current state of the security methods used on these devices is discussed. Deficiencies of prevailing approaches are pointed out, and the need for new authentication mechanisms is reasoned. The hardware available in modern touch screen devices is characterized, and the sensors providing biometric data are described.\nIn the last part of this chapter, some of the new security means using biometric features and potential new directions are discussed.","tags":[],"title":"A study on touch screen devices: User authentication problems","type":"publication"},{"authors":null,"categories":null,"content":"","date":-62135596800,"expirydate":-62135596800,"kind":"page","lang":"en","lastmod":-62135596800,"objectID":"f26b5133c34eec1aa0a09390a36c2ade","permalink":"https://mrogowski.github.io/admin/config.yml","publishdate":"0001-01-01T00:00:00Z","relpermalink":"/admin/config.yml","section":"","summary":"","tags":null,"title":"","type":"wowchemycms"}]