نتایج جستجو برای: ecological problem

تعداد نتایج: 975966  

Journal: :Journal of experimental psychology. Human perception and performance 1988
S Runeson

The distorted room illusion (DRI) and the attendant argument for perceptual ambiguity is critically analyzed from a Gibsonian/ecological point of view. The notions of multiple specification, conflicting information, and perceptual skill are invoked in showing how the ecological approach can accommodate illusion effects that may remain under mobile binocular viewing conditions. Static optic arra...

2016
Joel Berger

Large protected areas are often considered natural yet outside pressures may compromise ecological integrity. This paper points to a problem in assessing ecological baselines: what if species’ extirpations go undetected? I present a data set spanning 130 years that demonstrates the loss of white-tailed jack rabbits Lepus townsendii from two National Parks in the well studied 60,000 km Greater Y...

Journal: :Pattern Recognition 1996
Ernest Chiarello Jean-Michel Jolion Claude Amoros

-The stochastic pyramid is introduced in landscape ecology in order to propose a spatial organization model of ecological units in river floodplains. It consists in articulating this parallel generator of random patterns with ecological processes. The stochastic pyramid, based on a hierarchy of seed structures, is used to make regions grow in order to obtain random patterns relating to an a pri...

2017
A Ghenassia J B Beuscart G Ficheur F Occelli E Babykina E Chazard M Genin

BACKGROUND The availability of big data in healthcare and the intensive development of data reuse and georeferencing have opened up perspectives for health spatial analysis. However, fine-scale spatial studies of ecological and medical databases are limited by the change of support problem and thus a lack of spatial unit interoperability. The use of spatial disaggregation methods to solve this ...

2012
Christopher J. Walsh Tim D. Fletcher Matthew J. Burns

Environmental flow assessment frameworks have begun to consider changes to flow regimes resulting from land-use change. Urban stormwater runoff, which degrades streams through altered volume, pattern and quality of flow, presents a problem that challenges dominant approaches to stormwater and water resource management, and to environmental flow assessment. We used evidence of ecological respons...

2008
John M. Flach Kim J. Vicente Fumiya Tanabe Kazuo Monta Jens Rasmussen

Four approaches to interface design are considered: technology centered, user centered, control centered, and use centered (ecological). Each perspective provides unique insights into pieces of the interface design problem. However, it is argued that the ecological or use centered approach provides a more comprehensive framework within which the other three perspectives can play important suppo...

2011
Martin de Wit

...................................................................................................................................................... 2 1. Reflecting on responses to the financial and ecological crises so far ....................... 2 2. When is something a messy problem? .................................................................................... 3 3. Integration of ha...

Journal: :The Yale Journal of Biology and Medicine 2005
Holmes Rolston

A pandemic is a human medical problem but must be understood at multiple levels. Analysis of social and commercial forces is vital, and, more comprehensively, an ecological framework is necessary for an inclusive picture. Ecological health webworked with political and social determinants surrounds issues of human health. In this constellation of both natural and social factors, ethical concerns...

2001
Virginia H. Dale Suzanne C. Beyeler

Ecological indicators can be used to assess the condition of the environment, to provide an early warning signal of changes in the environment, or to diagnose the cause of an environmental problem. Ideally the suite of indicators should represent key information about structure, function, and composition of the ecological system. Three concerns hamper the use of ecological indicators as a resou...

2017
Les G Firbank Chiara Bertora David Blankman Gemini Delle Vedove Mark Frenzel Carlo Grignani Elli Groner Miklós Kertész Eveline J Krab Giorgio Matteucci Christina Menta Carsten W Mueller Jutta Stadler William E Kunin

The study of ecosystem processes over multiple scales of space and time is often best achieved using comparable data from multiple sites. Yet, long-term ecological observatories have often developed their own data collection protocols. Here, we address this problem by proposing a set of ecological protocols suitable for widespread adoption by the ecological community. Scientists from the Europe...

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