Search results for: Krzysztof Kaczmarski

Items from 1 to 20 out of 97 results

article

Hierarchical data structures in rendering scenes containing a massive number of light sources

Andrzej Lamecki, Krzysztof Kaczmarski, Joanna Porter-Sobieraj

Annals of Computer Science and Information Systems > 2022 > Vol. 30 > 535--544

In order to speed up the process of rendering scenes containing many light sources, spatial data structures are used, which allow the number of lights processed for each pixel to be reduced during lighting computation. Examples of algorithms using such data structures are clustered shading and hybrid lighting. Alongside the rendering time, it is important to consider memory consumption resulting from...

article

GPU R‐Trie: Dictionary with ultra fast lookup

Krzysztof Kaczmarski, Albert Wolant

Concurrency and Computation: Practice and Experience > 31 > 19 > n/a - n/a

R‐Trie dictionary is a multi‐way retrieval tree for arbitrary length binary keys. It is designed taking into account utilization of thousands of parallel vector threads, a fundamental technique of programming GPU processors. Dictionary bulk creation algorithm automatically scales to use as many threads as elements in the input batch, without any synchronization or page locking, exceeding 20·10⁶ key...

article

Obchody rocznicy odzyskania niepodległości oraz innych rocznic historycznych przez Stronnictwo Narodowe w Wielkiej Brytanii

Krzysztof Kaczmarski

Dzieje Najnowsze > 2019 > 51 > 2

Tematem artykułu są obchody rocznicy odzyskania przez Polskę niepodległości oraz innych rocznic historycznych (przede wszystkim rocznicy podpisania traktatu wersalskiego), organizowane po II wojnie światowej przez Stronnictwo Narodowe (SN) w Wielkiej Brytanii. The subject of the article are the celebrations of the anniversaries of important events of Polish history, such as the anniversary of regaining...

article

Investigation of robustness for supercritical fluid chromatography separation of peptides: Isocratic vs gradient mode

Martin Enmark, Emelie Glenne, Marek Leśko, Annika Langborg Weinmann, more

Journal of Chromatography A > 2018 > 1568 > C > 177-187

We investigated and compared the robustness of supercritical fluid chromatography (SFC) separations of the peptide gramicidin, using either isocratic or gradient elution. This was done using design of experiments in a design space of co-solvent fraction, water mass fraction in co-solvent, pressure, and temperature. The density of the eluent (CO₂-MeOH-H₂O) was experimentally determined using a Coriolis...

article

Optimizing Column Length and Particle Size in Preparative Batch Chromatography Using Enantiomeric Separations of Omeprazole and Etiracetam as Models: Feasibility of Taguchi Empirical Optimization

Jörgen Samuelsson, Marek Leśko, Martin Enmark, Joakim Högblom, more

Chromatographia > 2018 > 81 > 6 > 851-860

The overreaching purpose of this study is to evaluate new approaches for determining the optimal operational and column conditions in chromatography laboratories, i.e., how best to select a packing material of proper particle size and how to determine the proper length of the column bed after selecting particle size. As model compounds, we chose two chiral drugs for preparative separation: omeprazole...

article

Parallel algorithms constructing the cell graph

Krzysztof Kaczmarski, Paweł Rzążewski, Albert Wolant

Concurrency and Computation: Practice and Experience > 29 > 23 > n/a - n/a

Motion planning is an important and well‐studied field of robotics. A typical approach to finding a route is to construct a cell graph representing a scene and then to find a path in such a graph. In this paper, we present and analyze several parallel algorithms for constructing the cell graph on a single instruction, multiple data‐like graphics processing unit (GPU) processor. GPU utilization is...

article

Fixed length lightweight compression for GPU revised

Krzysztof Kaczmarski, Piotr Przymus

Journal of Parallel and Distributed Computing > 2017 > 107 > C > 19-36

Limitations of I/O bandwidth and latency are a serious burden for many data intensive algorithms. This is even more noticeable in distributed heterogeneous clusters that heavily utilize GPU processors, where communication costs and limitation of memory play crucial role. Lightweight lossless compression methods are often applied to cope with those limitations. In this paper we investigate new approaches...

article

The importance of ion-pairing in peptide purification by reversed-phase liquid chromatography

Dennis Åsberg, Annika Langborg Weinmann, Tomas Leek, Richard J. Lewis, more

Journal of Chromatography A > 2017 > 1496 > C > 80-91

The adsorption mechanism for three peptides was studied under overloaded conditions through adsorption isotherm measurements in the presence of an ion-pairing reagent, trifluoroacetic acid (TFA), on an end-capped C₁₈-bonded stationary phase. The overall aim of the study was to obtain a better understanding of how the acetonitrile and the TFA fractions in the eluent affected the overloaded elution...

article

Estimation of Nonlinear Adsorption Isotherms in Gradient Elution RP-LC of Peptides in the Presence of an Adsorbing Additive

Dennis Åsberg, Marek Leśko, Tomas Leek, Jörgen Samuelsson, more

Chromatographia > 2017 > 80 > 6 > 961-966

In electrostatic repulsive interaction chromatography, using a charged surface hybrid sorbent carrying positive charges can improve the peak shape of peptides in reversed-phase liquid chromatography (RP-LC), especially in overloaded conditions, compared with standard C₁₈ sorbents. However, the positive surface charges can interact with anionic additives commonly used in peptide separations, e.g.,...

article

The Joule-Thomson coefficient as a criterion for efficient operating conditions in supercritical fluid chromatography

Donald P. Poe, Shawn Helmueller, Stephanie Kobany, Hannah Feldhacker, more

Journal of Chromatography A > 2017 > 1482 > C > 76-96

When an SFC column is operated in a traditional oven with forced air at low pressures near the critical temperature, severe efficiency losses can occur. The mobile phase cools as it expands along the column, forming axial and radial temperature gradients. In this study we present a simple model based on a virtual fluid to predict the conditions which lead to the onset of efficiency loss. The model...

article

A practical approach for predicting retention time shifts due to pressure and temperature gradients in ultra-high-pressure liquid chromatography

Dennis Åsberg, Marcin Chutkowski, Marek Leśko, Jörgen Samuelsson, more

Journal of Chromatography A > 2017 > 1479 > C > 107-120

Large pressure gradients are generated in ultra-high-pressure liquid chromatography (UHPLC) using sub–2μm particles causing significant temperature gradients over the column due to viscous heating. These pressure and temperature gradients affect retention and ultimately result in important selectivity shifts. In this study, we developed an approach for predicting the retention time shifts due to these...

article

Działalność Służby Bezpieczeństwa wobec klasztoru OO Kapucynów w Krośnie w latach 1981-1989

Krzysztof Kaczmarski

Nasza Przeszłość. Studia z dziejów Kościoła i kultury katolickiej w Polsce > 2017 > 127 > 267-300

W latach 1982-89 klasztor oo. Kapucynów w Krośnie należał do tych jednostek administracyjnych Kościoła katolickiego na terenie ówczesnego województwa krośnieńskiego, które udzielały zdecydowanego wsparcia lokalnym strukturom „Solidarności” i wokół których ogniskowała się działalność miejscowych środowisk opozycyjnych. Ojciec gwardian Bogusław Piechuta oraz jego zakonni współbracia: o. Ryszard Śleboda...

chapter

Modeling Data Integration with Updateable Object Views

Piotr Habela, Krzysztof Kaczmarski, Hanna Kozankiewicz, Kazimierz Subieta

Lecture Notes in Computer Science > SOFSEM 2005: Theory and Practice of Computer Science > Full Contributed Papers > 188-198

Recently, a range of applications of views increases. Views are not anymore tightly related to classical databases – there are proposals to use them as means of data transformation and integration in distributed environment. Despite many aspects of view applications, there is still lack of suitable graphical notation that would help designers by providing clear notions from the very early stage of...

chapter

Autonomous Layer for Data Integration in a Virtual Repository^,

Kamil Kuliberda, Radoslaw Adamus, Jacek Wislicki, Krzysztof Kaczmarski, more

Lecture Notes in Computer Science > On the Move to Meaningful Internet Systems 2006: CoopIS, DOA, GADA, and ODBASE > Autonomous and Autonomic Computing > 1290-1304

The paper describes a self-operating integration mechanism for virtual repository’s distributed resources based on object-oriented databases in a grid architecture. The core architecture is based on the SBA theory and its virtual updateable views. Our virtual repository transparently processes heterogeneous data producing conceptually and semantically coherent results. Our integration apparatus is...

article

Combining Chemometric Models with Adsorption Isotherm Measurements to Study Omeprazole in RP-LC

Dennis Åsberg, Marek Leśko, Jörgen Samuelsson, Anders Karlsson, more

Chromatographia > 2016 > 79 > 19-20 > 1283-1291

The adsorption of the proton-pump inhibitor omeprazole was investigated using RP-LC with chemometric models combined with adsorption isotherm modelling to study the effect of pH and type of organic modifier (i.e., acetonitrile or methanol). The chemometric approach revealed that omeprazole was tailing with methanol and fronting with acetonitrile along with increased fronting at higher pH. The increased...

chapter

Transparent Migration of Database Services

Krzysztof Kaczmarski

Lecture Notes in Computer Science > SOFSEM 2006: Theory and Practice of Computer Science > Regular Papers > 332-340

Database services are tightly connected to network nodes, in present distributed query processing. We believe that dynamic changes of data and services environment are unpreventable. Currently, moving services to other locations, while continuing operations’ execution without notifying their clients (service migration), is not supported. We analyze requirements for transparent migration of database...

chapter

Comparing GPU and CPU in OLAP Cubes Creation

Krzysztof Kaczmarski

Lecture Notes in Computer Science > SOFSEM 2011: Theory and Practice of Computer Science > 308-319

GPGPU (General Purpose Graphical Processing Unit) programming is receiving more attention recently because of enormous computations speed up offered by this technology. GPGPU is applied in many branches of science and industry not excluding databases, even if this is not the primary field of expected benefits. In this paper a typical time consuming database algorithm, i.e. OLAP cube creation,...

chapter

OCL as the Query Language for UML Model Execution

Piotr Habela, Krzysztof Kaczmarski, Krzysztof Stencel, Kazimierz Subieta

Lecture Notes in Computer Science > Computational Science – ICCS 2008 > Workshop on Software Engineering for Large-Scale Computing > 311-320

Despite the specification of OCL mentions “query language” as one of its possible applications, there are rather few efforts in that direction. However, the problem becomes central where applying MDA to data intensive application modelling is considered. Recently added UML elements of Actions and Structured Activities make it possible to represent a level of detail similar to the one of common programming...

chapter

A Generic Approach to Design and Querying of Multi-purpose Human Motion Database

Wiktor Filipowicz, Piotr Habela, Krzysztof Kaczmarski, Marek Kulbacki

Lecture Notes in Computer Science > Computer Vision and Graphics > Human Motion Analysis and Synthesis > 105-113

The advancement of motion recording, analysis and synthesis techniques, together with the standardization of respective data formats, constitutes a solid foundation for research based on motion data sets in the context of various disciplines. However, most of the motion data sets available offer groups of files as acquired from the motion capture systems. The problem with such data is that it usually...

chapter

Implementing OCL as a Database Query Language

Piotr Habela, Krzysztof Kaczmarski, Krzysztof Stencel, Kazimierz Subieta

Lecture Notes in Computer Science > On the Move to Meaningful Internet Systems 2007: OTM 2007 Workshops > Posters of the 2007 ODBASE (Ontologies, Databases, and Applications of Semantics) International Conference > 17-18

The approach of model-driven software development sketches the vision of the next big step in raising the level of abstraction and flexibility of programming tools. The key expectation behind MDA is achieving a productivity gain through the automating software construction based on models. In this paper we focus on one of possible model application, namely executable models.

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COLUMN EFFICIENCY (9)
ADSORPTION ISOTHERM (8)
INVERSE METHOD (7)
PEAK PROFILES (7)
SUPERCRITICAL FLUID CHROMATOGRAPHY (7)
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FMOC-L-TRYPTOPHAN IMPRINTED POLYMERS (4)
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CHIRAL STATIONARY PHASE (3)
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HPLC (2)
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OCL (2)
OMEPRAZOLE (2)
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2,2,2-(TRIFLUORO)-1-(9-ANTHRYL)-ETHANOL (1)
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Search results for: Krzysztof Kaczmarski

Hierarchical data structures in rendering scenes containing a massive number of light sources

GPU R‐Trie: Dictionary with ultra fast lookup

Obchody rocznicy odzyskania niepodległości oraz innych rocznic historycznych przez Stronnictwo Narodowe w Wielkiej Brytanii

Investigation of robustness for supercritical fluid chromatography separation of peptides: Isocratic vs gradient mode

Optimizing Column Length and Particle Size in Preparative Batch Chromatography Using Enantiomeric Separations of Omeprazole and Etiracetam as Models: Feasibility of Taguchi Empirical Optimization

Parallel algorithms constructing the cell graph

Fixed length lightweight compression for GPU revised

The importance of ion-pairing in peptide purification by reversed-phase liquid chromatography

Estimation of Nonlinear Adsorption Isotherms in Gradient Elution RP-LC of Peptides in the Presence of an Adsorbing Additive

The Joule-Thomson coefficient as a criterion for efficient operating conditions in supercritical fluid chromatography

A practical approach for predicting retention time shifts due to pressure and temperature gradients in ultra-high-pressure liquid chromatography

Działalność Służby Bezpieczeństwa wobec klasztoru OO Kapucynów w Krośnie w latach 1981-1989

Modeling Data Integration with Updateable Object Views

Autonomous Layer for Data Integration in a Virtual Repository^,

Combining Chemometric Models with Adsorption Isotherm Measurements to Study Omeprazole in RP-LC

Transparent Migration of Database Services

Comparing GPU and CPU in OLAP Cubes Creation

OCL as the Query Language for UML Model Execution

A Generic Approach to Design and Querying of Multi-purpose Human Motion Database

Implementing OCL as a Database Query Language

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