5,158 research outputs found
Balancing Network Security and Privacy: One Organization\u27s Effort
An organization with internet access runs a high risk of compromising their computer network. Data can be corrupted, confidential information can be stolen, and viruses can paralyze an entire network. Monitoring employee activity involves questionable legal issues and risk of violating the employees’ privacy. An organization must balance the need for monitoring against possible damage to morale, because even an innocent employee may feel spied on. According to American Management Association’s annual survey on workplace monitoring released in April 2001, 78% of large firms in the U.S. are monitoring their employees, but 10% do not notify their employees of this. Monitoring is most common in the for-profit organizations, however 62% of public administrative organizations monitor their employees, and it may have increased since then. Of the 78% of monitoring organizations, 2/3 have disciplined employees for abusing their internet privileges, and more than 1/3 have dismissed employees for these abuses (Skelton)
A ROS2 based communication architecture for control in collaborative and intelligent automation systems
Collaborative robots are becoming part of intelligent automation systems in
modern industry. Development and control of such systems differs from
traditional automation methods and consequently leads to new challenges.
Thankfully, Robot Operating System (ROS) provides a communication platform and
a vast variety of tools and utilities that can aid that development. However,
it is hard to use ROS in large-scale automation systems due to communication
issues in a distributed setup, hence the development of ROS2. In this paper, a
ROS2 based communication architecture is presented together with an industrial
use-case of a collaborative and intelligent automation system.Comment: 9 pages, 4 figures, 3 tables, to be published in the proceedings of
29th International Conference on Flexible Automation and Intelligent
Manufacturing (FAIM2019), June 201
Geometric characterizations of asymptotic flatness and linear momentum in general relativity
In 1996, Huisken-Yau proved that every three-dimensional Riemannian manifold
can be uniquely foliated near infinity by stable closed surfaces of constant
mean curvature (CMC) if it is asymptotically equal to the (spatial)
Schwarzschild solution. Later, their decay assumptions were weakened by
Metzger, Huang, Eichmair-Metzger, and the author. In this work, we prove the
reverse implication, i.e. any three-dimensional Riemannian manifold is
asymptotically flat if it possesses a CMC-cover satisfying certain geometric
curvature estimates, a uniqueness property, a weak foliation property, and each
surface has weakly controlled instability. With the author's previous result
that every asymptotically flat manifold possesses a CMC-foliation, we conclude
that asymptotic flatness is characterized by existence of such a CMC-cover.
Additionally, we use this characterization to give a geometric (i.e.
coordinate-free) definition of a (CMC-)linear momentum and prove its
compatibility with the linear momentum defined by Arnowitt-Deser-Misner.Comment: The main theorem was generalized - therefore several changes
troughout the article. Included additional information to the Sobolev
setting. Added reference to Bando-Kasue-Nakajima's articl
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