Location-based services are increasingly used in our daily activities. In current services, users however have to give up their location privacy in order to acquire the service. The literature features a large number of contributions which aim at enhancing user privacy in location-based services. Most of these contributions obfuscate the locations of users using spatial and/or temporal cloaking...

In semi-arid environments characterized by erratic rainfall and scattered primary production, migratory movements are a key survival strategy of large herbivores to track resources over vast areas. Veterinary Cordon Fences (VCFs), intended reduce wildlife-livestock disease transmission, fragment parts southern Africa have limited the wild mammals for 60 years. Consequently, wildlife-fence inter...

Abstract This study uses hydraulic modeling to examine the impacts of two new fence sections at Eagle Pass, Texas: a container and state-funded section south, downstream, already modeled federal border fence. We used model Nays2DFlood compare non-fence conditions various recurrence intervals determine how is affecting flood extents, water depth, velocity. Water depth deeper in channel floodplai...

Sketch of experimental lot where windbreak protection was tested. East-west fence (left) is 6 feet high; north-south fence (top) is 8 feet high. Shed and barn also provide protection. duced the wind run by about one-half. Performance data (table 3) indicates the major effects of windbreaks were on feed intake and feed conversion. These effects were consistent for three years and were statistica...

A Special Perturbations Space Object Catalog is currently maintained at Naval Space Command with a weighted batch least squares estimator. The first and second central moments of the satellite observation errors are required by these normal equations in the form of an observation error covariance matrix. Accurate orbits, estimated from satellite laser ranging, provide a suitable reference from ...

This paper considers the responses of online students to two distinct collaborative small group structures. In one structure the students worked in closed groups, communicating only with one another, while in the other situation, although the students posted messages only to their own ‘backyard’ group they were also able to read the dialogues of all the other groups, ‘over the fence’. Both stru...

Fatal high-speed head-on collisions often occur in limited spaces on two-lane roads without median strips. While the installation of such strips is permitted under the Road Construction Ordinance, their provision to date has been limited due to the high associated costs. Wire rope guardrail systems, which can be seen as an alternative to median strips, involve the use of thin posts, have a buff...

Abstract Concrete-plate fences have been widely adopted for windblown sand control and mitigation along railways. However, the inclination angles of inserting concrete plate with respect to vertical direction, i.e., straight or obliquely inserted plates (SIP OIP), significantly influence efficiency sand-control. This study performs a comparative evaluation SIP OIP sand-control using wind tunnel...