Results 201 to 210 of about 11,725 (252)

Language of Perseverative Thoughts Predicts Emotion Regulation Strategy Choice. [PDF]

Affect Sci
Zhu Y, Trent K, Garcia B, Thompson RJ.
europepmc   +1 more source

The use of IT-safety and coping measures against cybercrimes among older adults in Hong Kong: an application of cyber routine activity theory. [PDF]

Front Sociol
Lam G, Lau BH, Tsang CK, Kwok AP, Shum EN.   +4 more
europepmc   +1 more source

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Possible European systems for space situational awareness

Acta Astronautica, 2010
Abstract As defined by ESA, space situational awareness (SSA) is the understanding and maintained awareness of the Earth orbital population, the space environment and possible threats to space assets. Space situational awareness is then understood as an upper-set of space surveillance. European SSA is relatively poor and many studies are performed in
Thomas Schildknecht
exaly   +3 more sources

Supporting Situation-Awareness in Smart Spaces

2012
This paper reports results from the ongoing research relating to the development on the context ontology described with OWL (Web Ontology Language). Our aim is to reach relevant context ontology for smart spaces that are by their nature heterogeneous, pervasive and ubiquitous.
Susanna Pantsar-Syväniemi, Jarkko Kuusijärvi, Eila Ovaska   +2 more
openaire   +2 more sources

Collaborative sensor scheduling for space situational awareness

2012 IEEE Statistical Signal Processing Workshop (SSP), 2012
In this paper, we investigate a method for simultaneously scheduling multiple space surveillance sensors that has the potential to exploit measurement level sensor fusion to improve orbital state estimation accuracy. State error covariance information is used to predict the influence independent and combined measurements will have on estimation ...
Hobson, Tyler A., Clarkson, I. Vaughan L.   +1 more
openaire   +2 more sources

Dynamic sensor tasking for Space Situational Awareness

Proceedings of the 2010 American Control Conference, 2010
This paper examines the problem of tracking multiple spacecraft using a combination of ground- and spacebased sensors. The problem is formulated in a simplified twodimensional setting to reduce computational complexity while retaining elements of the problem that pose theoretical or practical difficulties (such as inverse square-law dynamics).
Richard Scott Erwin, Paul Albuquerque, Sudharman K. Jayaweera, Islam I. Hussein   +3 more
openaire   +1 more source

Space situational awareness: an overview

2010
In the past 20 years we have experienced rapid growth in the launch of space assets by dozens of nations and operators, mostly for communications and entertainment (TV) purposes but also to provide increased services for the public in general (navigation systems for example) and for the military in particular.
Giovanni Gasparini, Valérie Miranda
openaire   +1 more source

Track before Detect for Space Situation Awareness

2015 International Conference on Digital Image Computing: Techniques and Applications (DICTA), 2015
This article considers the application of multi-target tracking algorithms to Space Situation awareness. The sensor is a telescope fitted with an optical band digital camera. Two different tracking paradigms are demonstrated: the first approach is a detect-then-track method that uses frame-to-frame registration to model the star field and detect a ...
Samuel J. Davey, Travis Bessell, Brian Cheung, Mark Rutten   +3 more
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Metrics on the space of bounded Keplerian orbits and space situational awareness

Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
A main difficulty for orbit determination of space debris is the correlation of tracks of data belonging to the same physical object. A sequence of optical measurements of an Earth orbiting object over a single track has sufficient information to determine the topocentric angles and angular rates with some degree of precision, but yields no information
Jared M. Maruskin, Daniel J. Scheeres
openaire   +1 more source