Results for 'van der Helm, Alfred'

(not author) ( search as author name )
999 found
Order:
  1.  8
    Goodness of visual regularities: A nontransformational approach.Peter A. van der Helm & Emanuel L. J. Leeuwenberg - 1996 - Psychological Review 103 (3):429-456.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   15 citations  
  2.  6
    A better approach to goodness: Reply to Wagemans (1999).Peter A. van der Helm & Emanuel L. J. Leeuwenberg - 1999 - Psychological Review 106 (3):622-630.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   6 citations  
  3.  11
    Holographic Goodness Is Not That Bad: Reply to Olivers, Chater, and Watson (2004).Peter A. van der Helm & Emanuel L. J. Leeuwenberg - 2004 - Psychological Review 111 (1):261-273.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  4.  39
    Natural selection of visual symmetries.Peter A. van der Helm - 2002 - Behavioral and Brain Sciences 25 (3):422-423.
    Implicitly, Wynn's target article starts from the transformational definition of symmetry. Unlike his suggestion, this traditional definition and the recent holographic definition are relevant to the discussion on the cognitive evolution of visual symmetries. These definitions reveal underlying properties and, thereby, they support the natural selection hypothesis. The holographic definition even agrees with an indirect test of this hypothesis.
    Direct download (7 more)  
     
    Export citation  
     
    Bookmark  
  5.  27
    Boekbesprekingen.Erik Eynikel, Martin Parmentier, J. Lambrecht, Archibald L. H. M. van Wieringen, O. H. Steck, Bart J. Koet, José R. de Kwaadsteniet, M. J. H. M. Poorthuis, Martien Parmentier, G. Rouwhorst, T. J. van Bavel, Jaap van der Meij, C. Traets, J. -J. Suurmond, Bernard Höfte, Wil Straatman, A. J. M. van der Helm, I. Verhack, A. van de Pavert, Bert Defreyne, Johan G. Hahn, Joh G. Hahn & T. van den Hoogen - 1991 - Bijdragen 52 (4):436-463.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  6.  25
    Boekbesprekingen.Erik Eynikel, Martien Parmentier, Kathleen Maenhaut, P. C. Beentjes, Martin Parmentier, Huub Welzen, Bart J. Koet, Hans Goddijn, M. Parmentier, Marc Schneiders, Ad van der Helm, J. Y. H. A. Jacobs, W. Logister, Peter de Haan, H. Rikhof, G. Rouwhorst, A. van de Pavert, Guido de Wert & Bert Defreyne - 1991 - Bijdragen 52 (2):207-232.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  7.  31
    Boekbesprekingen.L. Dequeker, Erik Eynikel, Antoon Schoors, P. C. Beentjes, F. De Meyer, L. Bakker, W. G. Tillmans, Marc Schneiders, Manien Parmentier, H. Hoet, Martin Parmentier, A. van de Pavert, Th Bell, Bernard Höfte, J. -J. Suurmond, Jos E. Vercruysse, A. B. Timmerman, A. H. C. van Eijk, A. van der Helm, W. Putman, Kitty Bouwman, Jeroen Vis & Hans Goddijn - 1992 - Bijdragen 53 (4):425-460.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  8.  30
    Boekbesprekingen.P. C. Beentjes, Bart J. Koet, Jan Lambrecht, A. van Dijk, Ad van der Helm, Th Bell, Heleen van de Reep, Freda Dröes, J. Besemer, Marieke Maes, Johan G. Hahn & Joh G. Hahn - 1992 - Bijdragen 53 (3):323-344.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  9.  27
    Boekbesprekingen.P. C. Beentjes, J. Lambrecht, Hendrik Hoet, Jaap van der Meij, W. G. Tillmans, Marcel Poorthuis, Th C. de Kruijf, B. Dehandschutter, Martin Parmentier, L. van Tongeren, Th Bell, J. Y. H. A. Jacobs, A. J. M. van der Helm, Hans Goddijn, H. J. Adriaanse, H. Rikhof, A. Braeckman, Henk Hoekstra & Johan G. Hahn - 1992 - Bijdragen 53 (1):86-111.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  10.  36
    Boekbesprekingen.P. C. Beentjes, Marc Schneiders, J. Lambrecht, Wim Weren, Bart J. Koet, M. J. J. Menken, J. C. Delbeek, G. Rouwhorst, Jacques van Ruiten, Ulrich Hemel, W. G. Tillmans, Ad V. D. Helm, Ad van der Helm, Drs J. L. M. Vis, A. van de Pavert, H. J. Adriaanse, A. A. Derksen, Freda Dröes & Joh G. Hahn - 1990 - Bijdragen 51 (3):324-343.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  11.  26
    Boekbesprekingen.Willem A. M. Beuken, P. C. Beentjes, Bart J. Koet, Theo de Kruijf, Hans Vandenholen, L. van Tongeren, Frans Vervooren, Liuwe H. Westra, Arie L. Molendijk, Stephan van Erp, A. J. M. van der Helm, R. Munnik, Walter Van Herck, Marin Terpstra, H. Göns, A. Poncelet, Johan Taels & D. C. Mulder - 1998 - Bijdragen 59 (3):338-362.
    No categories
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  12.  39
    Boekbesprekingen.J. T. A. G. M. van Ruiten, P. C. Beentjes, Archibald L. H. M. van Wieringen, Martijn Schrama, Reimund Bieringer, G. J. M. Bartelink, Liuwe H. Westra, Rob Meens, Th Bell, Marcel Sarot, A. J. M. van der Helm, R. G. W. Huysmans, Ko Joosse, Jan Visser, Ben Vedder, Luc Anckaert, H. J. Adriaanse, Lourens Minnema, Arie L. Molendijk, C. Bakker & A. H. C. van Eijk - 1997 - Bijdragen 58 (4):447-483.
    No categories
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  13.  14
    Nature and Logos: A Whiteheadian Key to Merleau-Ponty's Fundamental Thought.William S. Hamrick & Jan Van der Veken - 2011 - State University of New York Press.
    Exploration of Alfred North Whitehead's influence on Maurice Merleau-Ponty's ontology of nature.
    Direct download  
     
    Export citation  
     
    Bookmark   6 citations  
  14.  7
    Nature and Logos: A Whiteheadian Key to Merleau-Ponty's Fundamental Thought.William S. Hamrick & Jan Van der Veken - 2012 - State University of New York Press.
    _Exploration of Alfred North Whitehead's influence on Maurice Merleau-Ponty's ontology of nature._.
    Direct download  
     
    Export citation  
     
    Bookmark   4 citations  
  15.  13
    An overview of the ancient world - (l.) de Blois, (r.J.) Van der spek an introduction to the ancient world. Third edition. Translated by Susan Mellor. Pp. XXX + 402, ills, maps. London and new York: Routledge, 2019 (first edition 1997). Paper, £32.99, us$44.95 (cased, £110, us$150). Isbn: 978-0-8153-7241-7 (978-1-138-50456-1 hbk). [REVIEW]Alfred Hirt - 2021 - The Classical Review 71 (1):131-133.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  16. Beauty and Holiness: The Dialogue Between Aesthetics and Religion.James Alfred Martin - 1990 - New jersey: Princeton University Press.
    In this broad historical and critical overview based on a lifetime of scholarship, James Alfred Martin, Jr., examines the development of the concepts of beauty and holiness as employed in theories of aesthetics and of religion. The injunction in the Book of Psalms to "worship the Lord in the beauty of holiness" addressed a tradition that has comprehended holiness primarily in terms of ethical righteousness--a conception that has strongly influenced Western understandings of religion. As the author points out, however, (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  17.  10
    War Emissions, Russia’s Invasion of Ukraine, and Just War Theory.Harry van der Linden - 2023 - International Journal of Applied Philosophy 37 (2):97-113.
    The Russian invasion of Ukraine on February 24, 2022, has already caused large amounts of greenhouse gas (GHG) emissions and will continue to do so for manyyears after hostilities have ceased mainly because of the emissions linked to the rebuilding of destroyed or damaged housing, public buildings, infrastructure, factories, and the like. My aim in this paper is to discuss how in a time of climate emergency such emissions of war should impact the political morality of states initiating, continuing, and (...)
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark  
  18.  4
    Het Naderend einde.E. van der Wolk (ed.) - 1975 - [Antwerpen]: De Nederlandsche Boekhandel.
    Direct download  
     
    Export citation  
     
    Bookmark  
  19. Locke and Arnauld on Judgment and Proposition.Maria van der Schaar - 2008 - History and Philosophy of Logic 29 (4):327-341.
    To understand pre-Fregean theories of judgment and proposition, such as those found in Locke and the Port-Royal logic, it is important to distinguish between propositions in the modern sense and propositions in the pre-Fregean sense. By making this distinction it becomes clear that these pre-Fregean theories cannot be meant to solve the propositional attitude problem. Notwithstanding this fact, Locke and Arnauld are able to make a distinction between asserted and unasserted propositions (in their sense). The way Locke makes this distinction (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   9 citations  
  20.  58
    The 'Law' of Uneven and Combined Development: Some Underdeveloped Thoughts.Marcel van der Linden - 2007 - Historical Materialism 15 (1):145-165.
    Ernest Mandel theorised the capitalist world economy as an articulated system of capitalist, semi-capitalist and precapitalist relations of production, linked to each other by capitalist relations of exchange and domination by the capitalist world market. This seems to be an interesting starting point for an historically well-founded theory, building on and going beyond Marx's work, of the worldwide expansion of the capitalist mode of production from its origins to the present. In his attempt to formulate his theory, Mandel did not (...)
    Direct download (6 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  21.  18
    Contributions to the development of Tibetan Buddhist epistemology: from the eleventh to the thirteenth century.Leonard W. J. Van der Kuijp - 1983 - Wiesbaden: F. Steiner.
  22. The cognitive act and the first-person perspective: an epistemology for constructive type theory.Maria van der Schaar - 2011 - Synthese 180 (3):391 - 417.
    The notion of cognitive act is of importance for an epistemology that is apt for constructive type theory, and for epistemology in general. Instead of taking knowledge attributions as the primary use of the verb 'to know' that needs to be given an account of, and understanding a first-person knowledge claim as a special case of knowledge attribution, the account of knowledge that is given here understands first-person knowledge claims as the primary use of the verb 'to know'. This means (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   9 citations  
  23. Ladyman’s Realism, van Fraassen’s Anti-Realism and Fine’s Middle-Way.Ragnar Van der Merwe - 2019 - Dissertation, Stellenbosch University
    Masters Thesis -- Stellenbosch University, 2019.
    No categories
     
    Export citation  
     
    Bookmark  
  24. G.F. Stout's theory of judgment and proposition: proefschrift ter verkrijging van de graad van Doktor.Maria Sandra van der Schaar - 1991 - [Leiden?]: M.S. van der Schaar.
  25.  81
    Neural blackboard architectures of combinatorial structures in cognition.van der Velde Frank & de Kamps Marc - 2006 - Behavioral and Brain Sciences 29 (1):37-70.
    Human cognition is unique in the way in which it relies on combinatorial (or compositional) structures. Language provides ample evidence for the existence of combinatorial structures, but they can also be found in visual cognition. To understand the neural basis of human cognition, it is therefore essential to understand how combinatorial structures can be instantiated in neural terms. In his recent book on the foundations of language, Jackendoff described four fundamental problems for a neural instantiation of combinatorial structures: the massiveness (...)
    Direct download (7 more)  
     
    Export citation  
     
    Bookmark   20 citations  
  26.  47
    Vulnerability of pregnant women in clinical research.Indira S. E. Van der Zande, Rieke van der Graaf, Martijn A. Oudijk & Johannes J. M. Van Delden - 2017 - Journal of Medical Ethics 43 (10):657-663.
    Background Notwithstanding the need to produce evidence-based knowledge on medications for pregnant women, they remain underrepresented in clinical research. Sometimes they are excluded because of their supposed vulnerability, but there are no universally accepted criteria for considering pregnant women as vulnerable. Our aim was to explore whether and if so to what extent pregnant women are vulnerable as research subjects. Method We performed a conceptual and empirical analysis of vulnerability applied to pregnant women. Analysis A conceptual analysis supports Hurst's definition (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   10 citations  
  27. Miscellanea W.J. Ganshof van der Meersch.W. J. Ganshof van der Meersch (ed.) - 1972 - Bruxelles,: E. Bruylant.
     
    Export citation  
     
    Bookmark  
  28.  16
    Preface.Wiebe van der Hoek & Michael Wooldridge - 2003 - Studia Logica 75 (1):3-5.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   7 citations  
  29.  31
    On Council Communism.Marcel van der Linden - 2004 - Historical Materialism 12 (4):27-50.
  30. New Materialism: Interviews and Cartographies.Rick Dolphijn & Iris van der Tuin - 2012 - Open Humanities Press.
  31.  37
    Towards disciplinary disintegration in biology.Wim J. Van Der Steen - 1993 - Biology and Philosophy 8 (3):259-275.
  32.  17
    Conspiracy Theories as Superstition: Today’s Mirror Image in Spinoza’s Tractatus Theologico-Politicus.Jamie van der Klaauw - 2021 - Philosophies 6 (2):39.
    The contention in this paper is that the theological-political disputes Spinoza was concerned with 350 years ago are similar to the conspiratorial disputes we experience today. The world in Spinoza’s Tractatus theologico-politicus, a political intervention in his time, serves as a “mirror image”, that is to say, it deals with the same problem we face today albeit in a different mode. Understanding our contemporary condition under the auspices of a Spinozist perspective, problems in countermeasures to the conspiratorial disputes come to (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  33.  4
    Descartes: wetenschap en wijsbegeerte.P. van der Hoeven - 1972 - Baarn: Wereldvenster.
    Direct download  
     
    Export citation  
     
    Bookmark  
  34.  25
    Two Concepts of Meaningful Work.Willem van der Deijl - 2024 - Journal of Applied Philosophy 41 (2):202-217.
    The concept of meaningful work is used to evaluate the quality of work. Typical cases of meaningless work that have been used to clarify this concept are assembly line work, and work involving other types of mindless tasks, but also David Graeber's ‘bullshit jobs’. I argue that there are at least two fundamental reasons to care about meaningful work: reasons from the wellbeing of the worker and reasons pertaining to meaningfulness of the worker's life. I first argue that a concept (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   3 citations  
  35.  32
    An Update on "Might'".Jaap van Der Does, Willem Groeneveld & Frank Veltman - 1997 - Journal of Logic, Language and Information 6 (4):361-380.
    This paper is on the update semantics for might of Veltman. Threeconsequence relations are introduced and studied in an abstract setting.Next we present sequent-style systems for each of the consequence relations.We show the logics to be complete and decidable. The paper ends with asyntactic cut elimination result.
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   15 citations  
  36.  16
    Complete Axiomatizations for Reasoning about Knowledge and Branching Time.Ron van der Meyden & Ka-shu Wong - 2003 - Studia Logica 75 (1):93-123.
    Sound and complete axiomatizations are provided for a number of different logics involving modalities for the knowledge of multiple agents and operators for branching time, extending previous work of Halpern, van der Meyden and Vardi [to appear, SIAM Journal on Computing] for logics of knowledge and linear time. The paper considers the system constraints of synchrony, perfect recall and unique initial states, which give rise to interaction axioms. The language is based on the temporal logic CTL*, interpreted with respect to (...)
    Direct download  
     
    Export citation  
     
    Bookmark   12 citations  
  37. On the Ambiguities of the Term Judgement. An Evaluation of Twardowski's Distinction between Action and Product.Maria van der Schaar - unknown
     
    Export citation  
     
    Bookmark   4 citations  
  38.  39
    A qualitative study on acceptable levels of risk for pregnant women in clinical research.Indira S. E. Van der Zande, Rieke van der Graaf, Martijn A. Oudijk & Johannes J. M. van Delden - 2017 - BMC Medical Ethics 18 (1):35.
    There is ambiguity with regard to what counts as an acceptable level of risk in clinical research in pregnant women and there is no input from stakeholders relative to such research risks. The aim of our paper was to explore what stakeholders who are actively involved in the conduct of clinical research in pregnant women deem an acceptable level of risk for pregnant women in clinical research. Accordingly, we used the APOSTEL VI study, a low-risk obstetrical randomised controlled trial, as (...)
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  39.  50
    Religiosity, CSR Attitudes, and CSR Behavior: An Empirical Study of Executives’ Religiosity and CSR.Corrie Mazereeuw-van der Duijn Schouten, Johan Graafland & Muel Kaptein - 2014 - Journal of Business Ethics 123 (3):437-459.
    In this paper, we examine the relationship between Christian religiosity, attitudes towards corporate social responsibility, and CSR behavior of executives. We distinguish four types of CSR attitudes and five types of CSR behavior. Based on empirical research conducted among 473 Dutch executives, we find that CSR attitudes mediate the influence of religiosity on CSR behavior. Intrinsic religiosity positively affects the ethical CSR attitude and negatively affects the financial CSR attitude, whereas extrinsic religiosity stimulates the philanthropic CSR attitude. Financial, ethical, and (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   13 citations  
  40.  15
    Injustice in Bioethics Research Funding: Going Further Upstream.Himani Bhakuni, Rieke van der Graaf & Seye Abimbola - 2022 - American Journal of Bioethics 22 (1):33-35.
    Fabi and Goldberg have helpfully shed some light on the wrongs perpetuated by the current funding architecture on research, sponsorship, and career development in the field of bioethics. The...
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  41.  25
    Cognitive Analysis of Educational Games: The Number Game.Han L. J. van der Maas & Enkhbold Nyamsuren - 2017 - Topics in Cognitive Science 9 (2):395-412.
    We analyze the cognitive strategies underlying performance in the Number task, a Math game that requires both arithmetic fluency and mathematical creativity. In this game all elements in a set of numbers have to be used precisely once to create a target number with basic arithmetic operations. We argue that some instances of this game are NP complete, by showing its relation to the well-known Partition problem. We propose heuristics based on the distinction in forward and backward reasoning. The Number (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   4 citations  
  42.  93
    “A Different Starting Point, a Different Metaphysics”: Reading Bergson and Barad Diffractively.Iris Van Der Tuin - 2011 - Hypatia 26 (1):22-42.
    This article provides an affirmative feminist reading of the philosophy of Henri Bergson by reading it through the work of Karen Barad. Adopting such a diffractive reading strategy enables feminist philosophy to move beyond discarding Bergson for his apparent phallocentrism. Feminist philosophy finds itself double bound when it critiques a philosophy for being phallocentric, because the setup of a master narrative comes into being with the critique. By negating a gender-blind or sexist philosophy, feminist philosophy only reaffirms its parameters, and (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   8 citations  
  43. Anniversary volume dedicated to professor dr. C. J. van der Klaauw. van der Klaauw & Cornelis Jakob (eds.) - 1969 - Leiden,: Brill.
     
    Export citation  
     
    Bookmark  
  44. Dynamic Epistemic Logic.Hans van Ditmarsch, Wiebe van der Hoek & Barteld Kooi - 2016 - Internet Encyclopedia of Philosophy.
    Dynamic Epistemic Logic This article tells the story of the rise of dynamic epistemic logic, which began with epistemic logic, the logic of knowledge, in the 1960s. Then, in the late 1980s, came dynamic epistemic logic, the logic of change of knowledge. Much of it was motivated by puzzles and paradoxes. The number … Continue reading Dynamic Epistemic Logic →.
     
    Export citation  
     
    Bookmark   114 citations  
  45.  31
    The role of medicine in the formation of early Greek thought.Philip van der Eijk - 2008 - In Patricia Curd & Daniel Graham (eds.), The Oxford Handbook of Presocratic Philosophy. Oxford University Press USA.
    The philosophical aspects of Greek medicine are now more widely appreciated, not only by historians of science and medicine but also by students of philosophy in a more narrow sense. There has also been a greater appreciation of the fact that Greek medical writers not only reflect a derivative awareness of developments in philosophy but that they also actively contributed to the formation of philosophical thought more strictly defined, for instance by developing concepts and methodologies for the acquisition of knowledge (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  46. Empowerment and heterogeneity amont talented pre-university science students in an enriched learning environment.A. E. Van der Valk & Albert Pilot - 2012 - In Sylvija Markic, Ingo Eilks, David Di Fuccia & Bernd Ralle (eds.), Issues of heterogeneity and cultural diversity in science education and science education research: a collection of invited papers inspired by the 21st Symposium on Chemical and Science Education held at the University of Dortmund, May 17-19, 2012. Aachen: Shaker Verlag.
     
    Export citation  
     
    Bookmark  
  47. Legal physician-assisted dying in Oregon and the Netherlands: evidence concerning the impact on patients in "vulnerable" groups.M. P. Battin, A. van der Heide, L. Ganzini, G. van der Wal & B. D. Onwuteaka-Philipsen - 2007 - Journal of Medical Ethics 33 (10):591-597.
    Background: Debates over legalisation of physician-assisted suicide or euthanasia often warn of a “slippery slope”, predicting abuse of people in vulnerable groups. To assess this concern, the authors examined data from Oregon and the Netherlands, the two principal jurisdictions in which physician-assisted dying is legal and data have been collected over a substantial period.Methods: The data from Oregon comprised all annual and cumulative Department of Human Services reports 1998–2006 and three independent studies; the data from the Netherlands comprised all four (...)
    Direct download (8 more)  
     
    Export citation  
     
    Bookmark   41 citations  
  48.  17
    Bioethics And Law: A Developmental Perspective.Wibren Van Der Burg - 1997 - Bioethics 11 (2):91-114.
    In most Western countries, health law bioethics are strongly intertwined. This strong connection is the result of some specific factors that, in the early years of these disciplines, facilitated a rapid development of both. In this paper, I analyse these factors and construe a development theory existing of three phases, or ideal‐typical models. In the moralistic‐paternalistic model, there is almost no health law of explicit medical ethics and the little law there is is usually based on traditional morality, combined with (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  49.  15
    Mere generality is not enough.Wim J. Van Der Steen & Peter B. Sloep - 1988 - Biology and Philosophy 3 (2):217-219.
  50.  52
    Dynamic Epistemic Logic.Hans van Ditmarsch, and, Wiebe van der Hoek & Barteld Kooi - 2016 - Internet Encyclopedia of Philosophy.
    Dynamic Epistemic Logic This article tells the story of the rise of dynamic epistemic logic, which began with epistemic logic, the logic of knowledge, in the 1960s. Then, in the late 1980s, came dynamic epistemic logic, the logic of change of knowledge. Much of it was motivated by puzzles and paradoxes. The number … Continue reading Dynamic Epistemic Logic →.
    No categories
    Direct download  
     
    Export citation  
     
    Bookmark   76 citations  
1 — 50 / 999