Modeling the propagation of peer-to-peer worms

Propagation of Peer-to-Peer (P2P) worms in the Internet is posing a serious challenge to network security research because of P2P worms' increasing complexity and sophistication. Due to the complexity of the problem, no existing work has solved the problem of modeling the propagation of P2P worms, especially when quarantine of peers is enforced. This paper presents a study on modeling the propagation of P2P worms. It also presents our applications of the proposed approach in worm propagation research.

Motivated by our aspiration to invent an easy-to-employ instrument for worm propagation research, the proposed approach models the propagation processes of P2P worms by difference equations of a logic matrix, which are essentially discrete-time deterministic propagation models of P2P worms. To the best of our knowledge, we are the first using a logic matrix in network security research in general and worm propagation modeling in particular.

Our major contributions in this paper are firstly, we propose a novel logic matrix approach to modeling the propagation of P2P worms under three different conditions; secondly, we find the impacts of two different topologies on a P2P worm's attack performance; thirdly, we find the impacts of the network-related characteristics on a P2P worm's attack performance in structured P2P networks; and fourthly, we find the impacts of the two different quarantine tactics on the propagation characteristics of P2P worms in unstructured P2P networks. The approach's ease of employment, which is demonstrated by its applications in our simulation experiments, makes it an attractive instrument to conduct worm propagation research.

Proof of Concept : developing a peer reviewed evidence-based interactive e-learning programme

Knowledge and skill acquisition related to vascular access are traditionally individual institutional educational initiatives. Australia currently has no national evidence based education programme for renal nurses. A survey of Australian and New Zealand Nephrology Educators' conducted in 2009, identified the need for more effective and consistent delivery of clinical education for nurses using innovative, web-based approaches supporting the tenets of e-learning methodologies. This paper discusses the development, implementation and proposed evaluation of a peer reviewed Australasian e-learning programme on buttonhole cannulation. It will further highlight the benefits of inter-organisational partnerships and how these partnerships can facilitate positive change in teaching and learning practices. This project has unique characteristics that collectively provide value, distinction and innovation to nurses, patients and renal departments. As the e-learning programme was founded on a platform of evidence-based practice it is therefore easily transferable to an international context.

Student peer and self assessment in the context of work integrated learning : making it work

Students are now experiencing opportunities in practice education where their learning is facilitated by professionals of varied backgrounds thus leading to issues of how to assess student performance while on placement. Educators have had to re-think the way in which students’ performance is assessed and to integrate the key graduate attributes of critical reflection, self and peer assessments and feedback. Using recommendations by Mason (1999) in relation to a collaborative group model for workplace learning and ‘The Self-Directed Learning Model’ by Gaiptman and Anthony (1989) the Occupational Wellness and Life Satisfaction (OWLS) program encourages students to reflect on their experiences in an environment of self and peer evaluation, focussing on the process of learning rather than purely on outcomes. Students are required to complete a self and peer assessment of their learning using a nationally recognised fieldwork evaluation instrument and develop a practice portfolio consisting of learning contract and supporting evidence for their self-assessment. Qualitative and quantitative data was collected via a questionnaire to alumni. The most frequently identified skills that were valued by respondents were autonomy and independence. Other benefits identified were facilitation of self directed learning, and ability to problem solve with colleagues and to share learning. In a higher education environment where lifelong learning and the ability to work collaboratively are valued graduate attributes, a focus on peer and self assessment within the context of work integrated learning contributes to graduates who are well placed to work in both traditional and newer and emerging areas of practice.

Early age alcohol use and later alcohol problems in adolescents : individual and peer mediators in a bi-national study

This paper examines whether there is cross-national similarity in the longitudinal relationship between early age alcohol use and adolescent alcohol problems. Potential mechanisms underlying this relationship also are examined, testing adolescent alcohol use, low self-regulation, and peer deviance as possible mediators. Students (N = 1,945) participating in the International Youth Development Study, a longitudinal panel survey study, responded to questions on alcohol use and influencing factors, and were followed annually over a 3-year period from 2002 to 2004 (98% retention rate). State-representative, community student samples were recruited in grade 7 in Washington State, United States (US, n = 961, 78% of those eligible; Mage = 13.09, SD = .44) and Victoria, Australia (n = 984, 76% of those eligible; Mage = 12.93, SD = .41). Analyses were conducted using multiple-group structural equation modeling. In both states, early age alcohol use (age 13) had a small but statistically significant association with subsequent alcohol problems (age 15). Overall, there was little evidence for mediation of early alcohol effects. Low self-regulation prospectively predicted peer deviance, alcohol use, and alcohol problems in both states. Peer deviance was more positively related to alcohol use and low self-regulation among students in Victoria compared to students in Washington State. The small but persistent association of early age alcohol use with alcohol problems across both samples is consistent with efforts to delay alcohol initiation to help prevent problematic alcohol use. Self-regulation was an important influence, supporting the need to further investigate the developmental contribution of neurobehavioral disinhibition.

The probability model of peer-to-peer botnet propagation

Active Peer-to-Peer worms are great threat to the network security since they can propagate in automated ways and flood the Internet within a very short duration. Modeling a propagation process can help us to devise effective strategies against a worm's spread. This paper presents a study on modeling a worm's propagation probability in a P2P overlay network and proposes an optimized patch strategy for defenders. Firstly, we present a probability matrix model to construct the propagation of P2P worms. Our model involves three indispensible aspects for propagation: infected state, vulnerability distribution and patch strategy. Based on a fully connected graph, our comprehensive model is highly suited for real world cases like Code Red II. Finally, by inspecting the propagation procedure, we propose four basic tactics for defense of P2P botnets. The rationale is exposed by our simulated experiments and the results show these tactics are of effective and have considerable worth in being applied in real-world networks.

Chronic illness peer support. Assisting adolescent adjustment to life with a chronic illness

A considerable number of young people face the challenge of living with a chronic illness.  For many, the experience of a chronic illness can be fraught with feelings of frustration, alienation and a sense of isolation.  Recently there has been growing interest in the use of peer support programs as a means of assisting young people's adjustment to life with a chronic illness.  Peer support programs offer therapeutic gain while being financially accessible.  This document describes the development of the Chronic Illness Peer Support (ChIPS) program run through the Centre for Adolescent Health, Melbourne.

Development of the teenage cancer peer support program - Canteen

With current medical technology, many young people diagnosed with cancer are able to be cured or given extended periods of disease remission. White treatment regimes are meeting with considerable success, the diagnosis and treatment of cancer is nevertheless often met with experiences of anxiety and despair. This paper discusses the advantages and disadvantages of referring patients to cancer peer support groups to assist those adjusting to a diagnosis of cancer. For others, Cancer is a chronic and debilitating illness, causing family dislocation, financial difficulties, social isolation and chronic uncertainty about the future. Contemporary attitudes towards cancer and adjunctive therapies are characterized by contradictory and confusing information and engender a range of emotions in patients and relatives ranging from suspicion to overt hostility.

A comparative study of effectiveness of peer assessment of individuals’ contributions to group projects in undergraduate construction management core units

In recent years, various forms of group work have been introduced in university courses across various subject domains, including construction management courses. Although the use of group work in higher education has sound pedagogical reasons and advantages, group work has its own drawbacks. Therefore, the acceptance by students and the success of group work critically depend on a fair and credible assessment of the group process. In this paper, the implementation of different approaches to peer assessment (PA) of individuals’ contributions to group projects in two core units in an undergraduate construction management course in an Australian university is reported. The effectiveness of the adopted PA approaches have been evaluated and validated by students. It has been found that contrary to doubts of the sufficiency of a simplistic approach to PAs, the fairness of a PA approach does not necessarily depend on its complexity. Besides, voluntary group discussions, learning and collaboration are found to aid in improving each of the group’s camaraderie. Hence, it is recommended that academics should develop both a structured methodology to progressively encourage group members to work cohesively in teams and effective PA approaches that measure individual member’s contribution.