66,702 research outputs found
Autonomic computing architecture for SCADA cyber security
Cognitive computing relates to intelligent computing platforms that are based on the disciplines of artificial intelligence, machine learning, and other innovative technologies. These technologies can be used to design systems that mimic the human brain to learn about their environment and can autonomously predict an impending anomalous situation. IBM first used the term ‘Autonomic Computing’ in 2001 to combat the looming complexity crisis (Ganek and Corbi, 2003). The concept has been inspired by the human biological autonomic system. An autonomic system is self-healing, self-regulating, self-optimising and self-protecting (Ganek and Corbi, 2003). Therefore, the system should be able to protect itself against both malicious attacks and unintended mistakes by the operator
Autonomic computing meets SCADA security
© 2017 IEEE. National assets such as transportation networks, large manufacturing, business and health facilities, power generation, and distribution networks are critical infrastructures. The cyber threats to these infrastructures have increasingly become more sophisticated, extensive and numerous. Cyber security conventional measures have proved useful in the past but increasing sophistication of attacks dictates the need for newer measures. The autonomic computing paradigm mimics the autonomic nervous system and is promising to meet the latest challenges in the cyber threat landscape. This paper provides a brief review of autonomic computing applications for SCADA systems and proposes architecture for cyber security
Efficient Energy Transport in Photosynthesis: Roles of Coherence and Entanglement
Recently it has been discovered---contrary to expectations of physicists as
well as biologists---that the energy transport during photosynthesis, from the
chlorophyll pigment that captures the photon to the reaction centre where
glucose is synthesised from carbon dioxide and water, is highly coherent even
at ambient temperature and in the cellular environment. This process and the
key molecular ingredients that it depends on are described. By looking at the
process from the computer science view-point, we can study what has been
optimised and how. A spatial search algorithmic model based on robust features
of wave dynamics is presented.Comment: 6 pages, 3 figures, to appear in the proceedings of the Symposium "75
Years of Quantum Entanglement: Foundations and Information Theoretic
Applications", January 2011, Kolkata, Indi
Towards Understanding the Origin of Genetic Languages
Molecular biology is a nanotechnology that works--it has worked for billions
of years and in an amazing variety of circumstances. At its core is a system
for acquiring, processing and communicating information that is universal, from
viruses and bacteria to human beings. Advances in genetics and experience in
designing computers have taken us to a stage where we can understand the
optimisation principles at the root of this system, from the availability of
basic building blocks to the execution of tasks. The languages of DNA and
proteins are argued to be the optimal solutions to the information processing
tasks they carry out. The analysis also suggests simpler predecessors to these
languages, and provides fascinating clues about their origin. Obviously, a
comprehensive unraveling of the puzzle of life would have a lot to say about
what we may design or convert ourselves into.Comment: (v1) 33 pages, contributed chapter to "Quantum Aspects of Life",
edited by D. Abbott, P. Davies and A. Pati, (v2) published version with some
editin
Surface-renewal models for heat-transfer between walls and fluidized beds
Two surface-renewed film penetration models describe transient heat-transfer between a wall and a fluidized bed. Methods are presented for estimation of mean residence times of particles at the transporting surface, their age densities and the average transport coefficients
Narrative approaches to design multi-screen augmented reality experiences
This paper explores how traditional narrative language used in film and theatre can be adapted to create interactivity and a greater sense of presence in the virtual heritage environment. It focuses on the fundamental principles of narrative required to create immersion and presence and investigates methods of embedding intangible social histories into these environments. These issues are explored in a case study of Greens Mill in the 1830’s, interweaving the story of the reform bill riots in Nottingham with the life of George Green, mathematician and proprietor of the Mill
Narrating the past: virtual environments and narrative
This paper explores how traditional narrative language used in film and theatre can be adapted to create interactivity and a greater sense of presence in the virtual heritage environment. It focuses on the fundamental principles of narrative required to create immersion and presence and investigates methods of embedding intangible social histories into these environments. These issues are explored in a case study of Greens Mill in the 1830’s, interweaving the story of the reform bill riots in Nottingham with the life of George Green, mathematician and proprietor of the Mill
A Transverse Lattice QCD Model for Mesons
QCD is analysed with two light-front continuum dimensions and two transverse
lattice dimensions. In the limit of large number of colours and strong
transverse gauge coupling, the contributions of light-front and transverse
directions factorise in the dynamics, and the theory can be analytically solved
in a closed form. An integral equation is obtained, describing the properties
of mesons, which generalises the 't Hooft equation by including spin degrees of
freedom. The meson spectrum, light-front wavefunctions and form factors can be
obtained by solving this equation numerically. These results would be a good
starting point to model QCD observables which only weakly depend on transverse
directions, e.g. deep inelastic scattering structure functions.Comment: Lattice 2003 (theory), 3 page
Are Galaxies Optically Thin to Their Own Lyman Continuum Radiation? II. NGC 6822
Halpha and UBV photometry of NGC 6822 are used to study the distribution of
OB stars and HII regions in the galaxy and to determine whether individual
regions of the galaxy are in a state of ionization balance. Four distinct
components of the Halpha emission (bright, halo, diffuse and field)
differentiated by their surface brightnesses are identified. We find that
approximately 1/2 of all OB stars in NGC 6822 are located in the field while
only 1/4 are found in the combined bright and halo regions, suggesting that OB
stars spend roughly 3/4 of their lifetimes outside ``classical'' H II regions.
Comparing the observed Halpha emission with that predicted from stellar
ionizing flux models, we find that although the bright, halo and diffuse
regions are probably in ionization balance, the field region is producing at
least 6 times as much ionizing flux as is observed. The ionization balance
results in NGC 6822 suggest that star formation rates obtained from Halpha
luminosities must underestimate the true star formation rate in this galaxy by
about 50%. Comparing our results for NGC 6822 with previous results for the
spiral galaxy M33, we find that the inner kiloparsec of M33 is in a more
serious state of ionization imbalance, perhaps due to its higher surface
density of blue stars.Comment: Replaced version should now compile with standard aastex style files.
28 pages, aastex preprint format. Accepted in ApJ. Hardcopies of figures
available on request to [email protected]
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