197,057 research outputs found
Conférence de M. Stanislaw Chojnacki
No full textChojnacki Stanislaw. Conférence de M. Stanislaw Chojnacki. In: École pratique des hautes études, Section des sciences religieuses. Annuaire. Tome 100, 1991-1992. 1991. pp. 353-360
A note on the locally linear embedding algorithm
No full textThe paper presents mathematical underpinnings of the locally linear embedding technique for data dimensionality reduction. It is shown that a cogent framework for describing the method is that of optimization on a Grassmann manifold. The solution delivered by the algorithm is characterized as a constrained minimizer for a problem in which the cost function and all the constraints are defined on such a manifold. The role of the internal gauge symmetry in solving the underlying optimization problem is illuminated.Wojciech Chojnacki, Michael J. Brook
Potential and relations of a university in a society and economy based on knowledge
No full textThe aim of the conceptual and constructivist efforts undertaken in the article was to present an outline of the evolution of network development and hyper-networks as well as a justification for the need to build increasingly complex social, economic, and public authorities. Such possibilities are created by the use of new concepts, methods, and ideas that not only precisely describe and explain complex relations of influence, but also indicate the need to strengthen the cooperation of an increasing number of institutions and organizations. It is a necessary process to design the next stages of learning and building multidimensional and multilevel interactions between universities, authorities, public administration, local and regional communities, and economic organizations. The author adopted Barton Clark’s model as the first common theoretical platform for the presented issues. It consists of three elements: the academic oligarchy, the market, and state power. He then extended it to the model of a triple and quadruple spiral of socio-economic control relations according to the model of H. Etzkowitz and L. Leydesdorff, which reflect the relations between higher education institutions and the economy, society, and public authorities on the institutional, legal, cultural, and organizational level.Włodzimierz Chojnacki – dr hab., prof. SGGW, Szkoła Główna Gospodarstwa Wiejskiego w WarszawieBitkowska A., Zarządzanie procesowe we współczesnych organizacjach, Wydawnictwo Difin, Warszawa 2013.Bogason P., Zolner M., Methods in democratic network, McMillan, New York 2007.Castells M., Himanen P., Społeczeństwo informacyjne i państwo dobrobytu, ze wstępem E. Benedyka, Wydawnictwo Krytyki Politycznej, Warszawa 2009.Castells M., Koniec tysiąclecia, PWN, Warszawa 2008.Castells M., Społeczeństwo sieci, PWN, Warszawa 2008.Chojnacki W., Człowiek w nowoczesnej organizacji. Wybrane problemy doradztwa personalnego i zawodowego, Wydawnictwo Adam Marszałek, Toruń 2006.Chojnacki W., Kazimierowicz R., Kultura profesjonalna menedżerów firm strukturalnych, Wydawnictwo Akademii Humanistycznej w Pułtusku, Pułtusk 2019.Chojnacki W., Wojsko i społeczeństwo w erze płynnej globalizacji, Wydawnictwo Wyższej Szkoły Wojsk Lądowych we Wrocławiu, Wrocław 2013.Damodaran A., Ryzyko strategiczne, Wydawnictwa Akademickie i Profesjonalne, Warszawa 2009.Dęmbinski P.H., Finanse po zawale. Od euforii finansowej do gospodarczego ładu, Wydawnictwo Studio Emka, Warszawa 2011Drucker P., Społeczeństwo pokapitalistyczne, PWN, Warszawa 1996.Etzkowitz H., Leydesdorff L., Universities and the Global Knowledge Economy. A Triple Helix of University-Industry-Government Relations, edited by John de la Mothe and Gilles Paquet, London – Washington 1997.Etzkowitz H., Losing our bearings: the science policy crisis in post-Cold War Eastern Europe, former Soviet Union and USA, „Science and Public Policy” 1996, t. 23, nr 1.Gieryn T.E., Boundary-work and the demarcation of science form non-science: strains and interests in professional ideologies of scientists, „American Sociological Review” 1983, t. 48, nr 6.Greenspan A., Era zawirowań. Krok w nowy wiek, Warszawskie Wydawnictwo MUZA, Warszawa 2008.Karpiński A., Paradysz S., Soroka P. Żółtkowski W., Od uprzemysłowienia w PRL do dezindustrializacji kraju, Warszawskie Wydawnictwo MUZA, Warszawa 2015.Kieżun W., Drogi i bezdroża polskich przemian, Wydawnictwo EKOTV Sp. z o.o., Warszawa 2011.Klein N., Doktryna szoku. Jak współczesny kapitalizm wykorzystuje klęski żywiołowe i kryzysy społeczne, Warszawskie Wydawnictwo MUZA, Warszawa 2014.Leśniewicz K., Mieli być nadzieją polskiej gospodarki, a biedują na uczelniach. Młodzi naukowcy nie mają łatwego życia. „Gazeta Prawna” 17.09.2018 r.Levi-Stauss C., The Elementary Structures of Kinship, Boston Press, Boston 1969.Masłyk-Musiał E., Społeczeństwo i organizacje. Socjologia organizacji i zarządzania, Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej, Lublin 1999.Modzelewski P., Opolski K., (red.) Metodologia pomiaru sieci administracji publicznej, Wydawnictwo CeDeWu. Warszawa 2014.Nelson R., Economic Growth via the coevolution of Technology and In stitution [w:] L. Leydesdorff, P. van de Besselaar (red.), Evolutionary Economic and Chaos Theory: New Directions in Technology Transfer, Palgrave MacMillan, London 1994.Nelson R., Winter S., An Evolutionary Theory of Economic Change, Belknap Press of Harvard University Press, Cambridge MA 1982.Noble D.F., Forces of Production, Knopf, New York 1984.Parsons T., Plat G.M., The American University, Harvard University Press, Cambridge MA 1975.Patologiczne aspekty polskiej prywatyzacji, Konwersatorium Polskiego Towarzystwa Ekonomicznego, 13.10.2016 r.Pawłowska B., Doktór K. (red.), Dylematy współczesnych korporacji, Wydawnictwo Uniwersytetu Łódzkiego, Warszawa 2009.Stachurski L., Kazimierz Twardowski wobec filozofii polskiej, [w:]W.Słomski (red.), Twórca szkoły lwowsko-warszawskiej w 70. Rocznicę śmierci Kazimierza Twardowskiego, Wydawnictwo Wyższej Szkoły Finansów i Zarządzania, Warszawa 2008.Stiglitz J., Globalizacja, PWN, Warszawa 2004.Sztompka P., Zaufanie. Fundament społeczeństwa, Wydawnictwo Znak, Kraków 2007.Sztumski J., Systemowa analiza społeczeństwa, Wydawnictwo Śląsk, Katowice 2013.Twardowski K., O dostojeństwie Uniwersytetu, „Zagadnienia Naukoznawstwa” 1990, nr 3.Woleński J., Filozoficzna szkoła lwowsko-warszawska, PWN, Warszawa 1985.Zacher L., Hybrydowy świat człowieka i ewolucja systemów socjotechnicznych, [w:] M. Sokołowski (red.), Sieciowe dyskursy (roz)poznawanie cyfrowego świata, Wydawnictwo Państwowej Wyższej Szkoły Zawodowej w Elblągu, Elbląg 2014.13114
On the consistency of the normalized eight-point algorithm
No full textA recently proposed argument to explain the improved performance of the eight-point algorithm that results from using normalized data (Chojnacki, W., et al. in IEEE Trans. Pattern Anal. Mach. Intell. 25(9):1172–1177, 2003) relies upon adoption of a certain model for statistical data distribution. Under this model, the cost function that underlies the algorithm operating on the normalized data is statistically more advantageous than the cost function that underpins the algorithm using unnormalized data. Here we extend this explanation by introducing a more refined, structured model for data distribution. Under the extended model, the normalized eight-point algorithm turns out to be approximately consistent in a statistical sense. The proposed extension provides a link between the existing statistical rationalization of the normalized eight-point algorithm and the approach of Mühlich and Mester for enhancing total least squares estimation methods via equilibration. The paper forms part of a wider effort to rationalize and interrelate foundational methods in vision parameter estimation.Wojciech Chojnacki and Michael J. Brook
Is it Still Art or Already Game? The Penetration of Aesthetics and Mechanics of Video Games to Interactive Art
No full textDominika Staszenko, Marcin M. Chojnacki
Is it Still Art or Already Game? The Penetration of Aesthetics
and Mechanics of Video Games to Interactive Art
In our article, we look at the work inspired by the medium, and the culture
of video games. We analyze the specifics of contact with the electronic
entertainment in a completely new context as considered by the producers
of games. We make a brief characterization of the selected projects in
the area of interactive art, aesthetics, mechanics or iconography drawn
from the popular digital games. We also analyze interesting analog representations
and solutions connected with certain ludic or thematic video
games in the context of practices affecting the perception of the medium,
as well as assessing its ‘maturity’ and the impact on today’s pop culture.
We concentrate on the issue of tangible and intangible disposits which we
consider significant in the context of art inspired by new media
Estimating vision parameters given data with covariances
No full textA new parameter estimation method is presented, applicable to many computer vision problems. It operates under the assumption that the data (typically image point locations) are accompanied by covariance matrices characterising data uncertainty. An MLE-based cost function is first formulated and a new minimisation scheme is then developed. Unlike Sampson’s method or the renormalisation technique of Kanatani, the new scheme has as its theoretical limit the true minimum of the cost function. It also has the advantages of being simply expressed, efficient, and unsurpassed in our comparative testing.Wojciech Chojnacki, Michael J. Brooks, Anton van den Hengel and Darren Gawle
Supplemental material for "Revealing active Mars with HiRISE digital terrain models"
No full textAnimated gifs showing active surface processes on Mars using time series generated from orthorectified images from the High Resolution Imaging Science Experiment (HiRISE) on the Mars Reconnaissance Orbiter.
These gifs are supplemental material accompanying the paper "Revealing active Mars with HiRISE digital terrain models" submitted to Remote Sensing.
Animation_1_RSL.gif: An animated HiRISE time-step sequence of recurring slope lineae (RSL) in Garni crater, Mars (11.51º S, 290.31º E). Note the slumping event along the south wall during Mars Year 32. See McEwen et al. (2013) and Chojnacki et al. (2016) for additional discussion. Sun symbol shows illumination direction for each frame.
Animation_2_Dunes.gif: An animated 3-step sequence of high flux ripples, megaripples, and dunes adjacent to the north polar cap boundary (83.99º N, 233.22º E) using HiRISE orthoimages. See for Diniega et al. (2017) and Chojnacki et al. (2021) for additional discussion. Sun symbol shows illumination direction for each frame.
References:
Chojnacki, M.; McEwen, A.; Dundas, C.; Ojha, L.; Urso, A.; Sutton, S. Geologic context of recurring slope lineae in Melas and Coprates Chasmata, Mars. Journal of Geophysical Research: Planets 2016, 121, 1204–1231. doi:10.1002/2015JE004991.
Chojnacki, M.; Vaz, D.A.; Silvestro, S.; Silva, D.C.A. Widespread Megaripple Activity Across the North Polar Ergs of Mars. Journal of Geophysical Research: Planets 2021, 126, 1–19. doi:10.1029/2021je006970.
Diniega, S.; Kreslavsky, M.; Radebaugh, J.; Silvestro, S.; Telfer, M.; Tirsch, D. Our evolving understanding of aeolian bedforms, based on observation of dunes on different worlds. Aeolian Research 2017, 26, 5–27. doi:10.1016/j.aeolia.2016.10.001.
McEwen, A.S.; Dundas, C.M.; Mattson, S.S.; Toigo, A.D.; Ojha, L.; Wray, J.J.; Chojnacki, M.; Byrne, S.; Murchie, S.L.; Thomas, N. Recurring slope lineae in equatorial regions of Mars. Nature Geoscience 2013, 7, 53–58. doi:10.1038/ngeo2014.
For inquiries regarding the contents of this dataset, please contact the Corresponding Author listed in the README.txt file. Administrative inquiries (e.g., removal requests, trouble downloading, etc.) can be directed to [email protected]
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A consistency result for the normalized eight-point algorithm
No full textCopyright © 2007 IEEEA recently proposed argument to explain the improved performance of the eight-point algorithm that results from using normalized data [IEEE Trans. Pattern Anal. Mach. Intell., 25(9):1172-1177, 2003] relies upon adoption of a certain model for statistical data distribution. Under this model, the cost function that underlies the algorithm operating on the normalized data is statistically more advantageous than the cost function that underpins the algorithm using unnormalized data. Here we extend this explanation by introducing a more refined, structured model for data distribution. Under the extended model, the normalized eight-point algorithm turns out to be approximately consistent in a statistical sense. The proposed extension provides a link between the existing statistical rationalization of the normalized eight-point algorithm and the approach of M¨uhlich and Mester for enhancing total least squares estimation methods via equilibration. Our contribution forms part of a wider effort to rationalize and interrelate foundational methods in vision parameter estimation.Wojciech Chojnacki and Michael J. Brook
A decoupled algorithm for vision parameter estimation with application to the trifocal tensor
No full text© Copyright 2008 IEEE – All Rights ReservedWe consider the problem of estimating parameters of a model described by a system of equations which underlies a wide class of computer vision applications. One method to solve such a problem is the fundamental numerical scheme (FNS) previously proposed by some of the authors. In this paper, a more stable version of FNS is developed, with better convergence properties than the original version. The improvement in performance is achieved by reducing the original estimation problem to a couple of problems of lower dimension. By way of example, the new algorithm has been applied to the problem of estimating the trifocal tensor relating three views of a scene. Experiments carried out with both synthetic and real images reveal the new estimator to be more stable compared to the original FNS method, and commensurate in accuracy with the Gold Standard maximum likelihood estimator.Scoleri, Tony, Chojnacki, Wojciech and Brooks, Michael J
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