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Full-Text Articles in Physical Sciences and Mathematics

On Node Isolation Under Churn In Unstructured P2p Networks With Heavy-Tailed Lifetimes, Zhongmei Yao, Xiaoming Wang, Dmitri Loguinov Jan 2015

On Node Isolation Under Churn In Unstructured P2p Networks With Heavy-Tailed Lifetimes, Zhongmei Yao, Xiaoming Wang, Dmitri Loguinov

Zhongmei Yao

Previous analytical studies [12], [18] of unstructured P2P resilience have assumed exponential user lifetimes and only considered age-independent neighbor replacement. In this paper, we overcome these limitations by introducing a general node-isolation model for heavy-tailed user lifetimes and arbitrary neighbor-selection algorithms. Using this model, we analyze two age-biased neighbor-selection strategies and show that they significantly improve the residual lifetimes of chosen users, which dramatically reduces the probability of user isolation and graph partitioning compared to uniform selection of neighbors. In fact, the second strategy based on random walks on age-weighted graphs demonstrates that for lifetimes with infinite variance, the system …


Organisational Resilience: A Propositional Study To Understand And Identify The Essential Concepts, Bruce Braes, David Brooks Sep 2014

Organisational Resilience: A Propositional Study To Understand And Identify The Essential Concepts, Bruce Braes, David Brooks

David J Brooks Dr.

Increased exposure to turmoil has raised business, social and governmental concerns over the ability of organisations to anticipate and respond positively to disruptions. Organisations are spending increased sums of money to raise levels of security; however, Organisational Resilience is a vague, multidisciplined and diverse philosophy, requiring a multiplicity of skills and knowledge that reaches far beyond security alone. The resilience domain is still developing and expanding; however, early embodiments of Organisational Resilience, originating in the United Kingdom and the United States, were nothing more than a rebranding of business continuity management strategies, put together as a ‘resilience processes’, or ‘resilience …


National Security: A Propositional Study To Develop Resilience Indicators As An Aid To Personnel Vetting, David Brooks, Jeff Corkill, Julie-Ann Pooley, Lynne Cohen, Cath Ferguson, Craig Harmes Sep 2014

National Security: A Propositional Study To Develop Resilience Indicators As An Aid To Personnel Vetting, David Brooks, Jeff Corkill, Julie-Ann Pooley, Lynne Cohen, Cath Ferguson, Craig Harmes

David J Brooks Dr.

Within the National Security domain there is a convergence of security responsibility across the national security agencies, law enforcement and private security sectors. The sensitivity of this environment requires individuals operating in the domain to be honest, trustworthy and loyal. Personnel vetting is a formal process used to determine an individual’s suitability for access to this domain. Notwithstanding this process, significant breaches of trust, security, and corruption still occur. In psychology, resilience is a well researched phenomenon that is considered a multidimensional construct where individual attributes, family aspects and social environment interact in aiding individuals to deal with vulnerability. There …


Finance, Fear And Family: Issues Of Trust And The Common Ground With Terrorist Funding, David Cook, Timothy Smith Feb 2014

Finance, Fear And Family: Issues Of Trust And The Common Ground With Terrorist Funding, David Cook, Timothy Smith

David M Cook

In the immediate aftermath of al-Qaeda‘s September 11 attacks on the United States of America, examinations of terrorist funding focused on the Middle Eastern and South Asian use of Hawala and non-traceable financial transactions. However, whilst the cloaking of identity is certainly a part of criminal activity for funds transfer, there are other factors. South Asia‘s community banking norms align far more closely with informal systems that follow centuries-old customs of familial trust rather than reportable record keeping. Tightened restrictions on money movement in the form of identity checks and statements of purpose have coerced more than two hundred million …


Evaluating Emergency Management After An Event: Gaps And Suggestions, Neil Dufty Sep 2013

Evaluating Emergency Management After An Event: Gaps And Suggestions, Neil Dufty

Neil Dufty

Post-event evaluations of emergency management are critical to help emergency service providers and communities learn to build disaster resilience. This paper identifies five main types of formal post-event evaluations of emergency management that are used in Australia. It argues that these evaluations should be more consistent in their conduct and approach, more comprehensive in scope, and better timed. The paper also suggests that post-event evaluation reports should be released particularly to the affected communities.


Evaluating The Efficacy Of Adaptive Management Approaches: Is There A Formula For Success?, Jamie E. Mcfadden, Tim L. Hiller, Andrew J. Tyre Apr 2013

Evaluating The Efficacy Of Adaptive Management Approaches: Is There A Formula For Success?, Jamie E. Mcfadden, Tim L. Hiller, Andrew J. Tyre

Andrew J Tyre

Within the field of natural-resources management, the application of adaptive management is appropriate for complex problems high in uncertainty. Adaptive management is becoming an increasingly popular management-decision tool within the scientific community and has developed into two primary schools of thought: the Resilience-Experimentalist School (with high emphasis on stakeholder involvement, resilience, and highly complex models) and the Decision-Theoretic School (which results in relatively simple models through emphasizing stakeholder involvement for identifying management objectives). Because of these differences, adaptive management plans implemented under each of these schools may yield varying levels of success. We evaluated peer-reviewed literature focused on incorporation of …


The Place Of Education In Building Disaster Resilience: A Strategic Examination, Neil Dufty Mar 2013

The Place Of Education In Building Disaster Resilience: A Strategic Examination, Neil Dufty

Neil Dufty

No abstract provided.


The Importance Of Connected Communities To Flood Resilience, Neil Dufty Jan 2013

The Importance Of Connected Communities To Flood Resilience, Neil Dufty

Neil Dufty

No abstract provided.


Reviewing Total Flood Warning Systems, Neil Dufty, Steven Molino Jan 2013

Reviewing Total Flood Warning Systems, Neil Dufty, Steven Molino

Neil Dufty

No abstract provided.


Efficient And Secure Stored-Value Cards With Leakage Resilience, Fuchun Guo, Yi Mu, Willy Susilo Dec 2012

Efficient And Secure Stored-Value Cards With Leakage Resilience, Fuchun Guo, Yi Mu, Willy Susilo

Professor Willy Susilo

Stored-value cards (SVCs) are a kind of smartcards that can be used to store monetary values. SVCs have demonstrated a wide range of applications in commerce. SVCs are in general tamper-resistant, but they are very computationally weak and their security mechanisms are also weak against side-channel attacks. In this paper, we propose an efficient and secure stored-value card system. With the help of pre-computations, storedvalue cards in our scheme are only required to perform simple arithmetic operations and bitwise comparisons. Our system especially for SVCs is secure with unbounded computational leakage resilience. Our novel scheme provides a practical solution to …


Towards A Resilient Sydney: Research Into The Role Of Emergency Management In Climate Change Adaptation (Research Summary), Neil Dufty, Tim Morrison Nov 2012

Towards A Resilient Sydney: Research Into The Role Of Emergency Management In Climate Change Adaptation (Research Summary), Neil Dufty, Tim Morrison

Neil Dufty

No abstract provided.


Community Flood Education And Awareness In Fairfield City (Report), Neil Dufty Nov 2012

Community Flood Education And Awareness In Fairfield City (Report), Neil Dufty

Neil Dufty

No abstract provided.


Efficient And Secure Stored-Value Cards With Leakage Resilience, Fuchun Guo, Yi Mu, Willy Susilo Nov 2012

Efficient And Secure Stored-Value Cards With Leakage Resilience, Fuchun Guo, Yi Mu, Willy Susilo

Professor Yi Mu

Stored-value cards (SVCs) are a kind of smartcards that can be used to store monetary values. SVCs have demonstrated a wide range of applications in commerce. SVCs are in general tamper-resistant, but they are very computationally weak and their security mechanisms are also weak against side-channel attacks. In this paper, we propose an efficient and secure stored-value card system. With the help of pre-computations, storedvalue cards in our scheme are only required to perform simple arithmetic operations and bitwise comparisons. Our system especially for SVCs is secure with unbounded computational leakage resilience. Our novel scheme provides a practical solution to …


Sea No Evil, Hear No Evil - Community Engagement On Adaptation To Sea Level Change, Neil Dufty, Heather Stevens, Stuart Waters, Greg Giles Oct 2012

Sea No Evil, Hear No Evil - Community Engagement On Adaptation To Sea Level Change, Neil Dufty, Heather Stevens, Stuart Waters, Greg Giles

Neil Dufty

No abstract provided.


Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya Oct 2012

Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya

Lynn Crawford

All levels of government recognise the widespread devastation of communities by natural or other disasters. They have responded with emergency management arrangements and policies to enhance government and community capacity to anticipate, withstand and recover from disastrous events. Although the construction industry has a significant role to play, particularly in recovery and reconstruction, it has not generally been considered as a key stakeholder in building capability for disaster resilience. One barrier to more active involvement of the construction industry in disaster response and management is that traditional methods of construction project management have been criticised as too time consuming and …


Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya Oct 2012

Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya

Craig Langston

All levels of government recognise the widespread devastation of communities by natural or other disasters. They have responded with emergency management arrangements and policies to enhance government and community capacity to anticipate, withstand and recover from disastrous events. Although the construction industry has a significant role to play, particularly in recovery and reconstruction, it has not generally been considered as a key stakeholder in building capability for disaster resilience. One barrier to more active involvement of the construction industry in disaster response and management is that traditional methods of construction project management have been criticised as too time consuming and …


Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya Oct 2012

Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya

Bhishna Bajracharya

All levels of government recognise the widespread devastation of communities by natural or other disasters. They have responded with emergency management arrangements and policies to enhance government and community capacity to anticipate, withstand and recover from disastrous events. Although the construction industry has a significant role to play, particularly in recovery and reconstruction, it has not generally been considered as a key stakeholder in building capability for disaster resilience. One barrier to more active involvement of the construction industry in disaster response and management is that traditional methods of construction project management have been criticised as too time consuming and …


Local Governments’ Risk-Based Approach To Climate Change Adaptation: A Missed Opportunity For Resilience In New South Wales, Nadine E. White Aug 2012

Local Governments’ Risk-Based Approach To Climate Change Adaptation: A Missed Opportunity For Resilience In New South Wales, Nadine E. White

Nadine E White

Parts of New South Wales (NSW) have experienced warming of 1.5 to 2.0 degrees Celsius in the period 1960 to 2009, indicating that the impacts of climate change are already being felt. Immediate, effective adaptation to potential impacts is crucial in reducing vulnerability to climate change. All three levels of government in Australia have a role in adaptation planning however it is local government that is at the ‘coal face’ of the outcomes of imminent climatic changes. This empirical research seeks to discover whether the existing institutional and cultural environment of local governments in NSW facilitates or impedes effective adaptation. …


Learning For Disaster Resilience, Neil Dufty Mar 2012

Learning For Disaster Resilience, Neil Dufty

Neil Dufty

No abstract provided.


Why Are People So Unkind? Unravelling Community Responses To Floodplain And Emergency Management (Powerpoint), Neil Dufty, Mel Taylor, Garry Stevens Jan 2012

Why Are People So Unkind? Unravelling Community Responses To Floodplain And Emergency Management (Powerpoint), Neil Dufty, Mel Taylor, Garry Stevens

Neil Dufty

No abstract provided.


Using Social Media To Build Community Disaster Resilience, Neil Dufty Dec 2011

Using Social Media To Build Community Disaster Resilience, Neil Dufty

Neil Dufty

No abstract provided.


Using Social Media To Build Community Disaster Resilience (Powerpoint), Neil Dufty Nov 2011

Using Social Media To Build Community Disaster Resilience (Powerpoint), Neil Dufty

Neil Dufty

No abstract provided.


Using Social Media For Natural Disaster Resilience (Booklet), Neil Dufty Jun 2011

Using Social Media For Natural Disaster Resilience (Booklet), Neil Dufty

Neil Dufty

No abstract provided.


Engagement Or Education?, Neil Dufty Jun 2011

Engagement Or Education?, Neil Dufty

Neil Dufty

No abstract provided.


Implications Of Recent Research In Community Flood Education, Neil Dufty Jan 2011

Implications Of Recent Research In Community Flood Education, Neil Dufty

Neil Dufty

No abstract provided.


Are Warnings Working? Achievements And Challenges In Getting Communities To Respond, Neil Dufty, Steven Molino, Geoff Crapper, Alison Karwaj Jan 2011

Are Warnings Working? Achievements And Challenges In Getting Communities To Respond, Neil Dufty, Steven Molino, Geoff Crapper, Alison Karwaj

Neil Dufty

No abstract provided.


A New Approach To Community Flood Education, Neil Dufty Oct 2010

A New Approach To Community Flood Education, Neil Dufty

Neil Dufty

No abstract provided.


Natural Hazards Education In Australian Schools: How Can We Make It More Effective?, Neil Dufty Apr 2009

Natural Hazards Education In Australian Schools: How Can We Make It More Effective?, Neil Dufty

Neil Dufty

No abstract provided.


Evaluation Of The Floodsmart And Stormsmart Pilot Programs And Their Transferability To The Urban Environment (Report), Neil Dufty Jan 2008

Evaluation Of The Floodsmart And Stormsmart Pilot Programs And Their Transferability To The Urban Environment (Report), Neil Dufty

Neil Dufty

No abstract provided.


A New Approach To Flood Education (Booklet), Neil Dufty Jan 2008

A New Approach To Flood Education (Booklet), Neil Dufty

Neil Dufty

No abstract provided.