Joint optimization of rule placement and traffic engineering for QoS provisioning in software defined network

Software-Defined Network (SDN) is a promising network paradigm that separates the control plane and data plane in the network. It has shown great advantages in simplifying network management such that new functions can be easily supported without physical access to the network switches. However, Ternary Content Addressable Memory (TCAM), as a critical hardware storing rules for high-speed packet processing in SDN-enabled devices, can be supplied to each device with very limited quantity because it is expensive and energy-consuming. To efficiently use TCAM resources, we propose a rule multiplexing scheme, in which the same set of rules deployed on each node apply to the whole flow of a session going through but towards different paths. Based on this scheme, we study the rule placement problem with the objective of minimizing rule space occupation for multiple unicast sessions under QoS constraints. We formulate the optimization problem jointly considering routing engineering and rule placement under both existing and our rule multiplexing schemes. Via an extensive review of the state-of-the-art work, to the best of our knowledge, we are the first to study the non-routing-rule placement problem. Finally, extensive simulations are conducted to show that our proposals significantly outperform existing solutions.

Fool me if you can: mimicking attacks and anti-attacks in cyberspace

Botnets have become major engines for malicious activities in cyberspace nowadays. To sustain their botnets and disguise their malicious actions, botnet owners are mimicking legitimate cyber behavior to fly under the radar. This poses a critical challenge in anomaly detection. In this paper, we use web browsing on popular web sites as an example to tackle this problem. First of all, we establish a semi-Markov model for browsing behavior. Based on this model, we find that it is impossible to detect mimicking attacks based on statistics if the number of active bots of the attacking botnet is sufficiently large (no less than the number of active legitimate users). However, we also find it is hard for botnet owners to satisfy the condition to carry out a mimicking attack most of the time. With this new finding, we conclude that mimicking attacks can be discriminated from genuine flash crowds using second order statistical metrics. We define a new fine correntropy metrics and show its effectiveness compared to others. Our real world data set experiments and simulations confirm our theoretical claims. Furthermore, the findings can be widely applied to similar situations in other research fields.

The method is design: towards a handbook of design research tactics

New Zealand's schools of architecture are unique in the Australasian context, in that the fifth year of study for students takes the form of a 12-month research thesis. This structure prompts reflection on research through the medium of design, which we will explore here in the context of the Victoria University of Wellington (VUW).

But with recent developments in digital technology, new materials and construction practices, shifts in the client-architect relationship, and architectural practice subject to evermore-onerous procurement models, is the studio model still ...

Teacher research on literacy: turning around to students and technology

This chapter first reviews the evolution of teacher research that links inquiry to democracy, social justice, and educational change. It then examines key moves in teacher research in and on children's literacy education. The 'turn around' metaphor is utilized to emphasize our belief that teachers need to engage in research for their own well-being and that of their students and communities. Using the metaphor of teachers 'turning around' to students as researchers and to technology, the chapter explores productive directions for future teacher research, given the strengths of past research and opportunities of the present. The research in this chapter demonstrates that engaging in teacher research has the potential to change teachers' work and their subjectivities.

Research productivity and academics’ conceptions of research

This paper asks the question: do people with different levels of research productivity and identification as a researcher think of research differently? It discusses a study that differentiated levels of research productivity among English and Australian academics working in research-intensive environments in three broad discipline areas: science, engineering and technology; social science and humanities; and medicine and health sciences. The paper explores the different conceptions of research held by these academics in terms of their levels of research productivity, their levels of research training, whether they considered themselves an active researcher and a member of a research team, and their disciplinary differences.

Mobile subjectivities positioning the nonunirary self in critical feminist and postmodern research

Most scholarly work is written from the perspective of the author being a unitary subject occupying a sole, rational, and unified position. This article argues that scholarship may be enhanced by the author adopting multiple subject positions as a methodological framework. Such an adoption is advantageous in working against the romance of the notion of a single truth while also maintaining teleological values congruent with critical and feminist agendas. This article outlines the conceptual development of this methodological framework, the rationale for its development, an explication of the concept of multiple subjectivity, and an exemplar of its application within nursing research.

Easier analysis and better reporting : modelling ordinal data in mathematics education research

This article presents an examination of the use of Rasch modelling in a major research project, 'Improving Middle Years Mathematics and Science' (IMYMS). It is unarguable that it is important to take students' perceptions, or views, into account when planning learning and teaching for them. The IMYMS student perceptions survey is an attempt to make visible these student viewpoints, and report them in a way that is accessible to teachers and researchers involved in the project. The project involves four clusters of schools from urban and regions of Victoria to investigate the role of mathematics and science knowledge and subject cultures in mediating change processes in the middle years of schooling. There are five secondary and twenty-eight primary schools. The project has generated both qualitative and quantitative data, with much of the qualitative data being ordinal in nature. Reporting the results of analyses for a range of audiences necessitates careful, well-designed report formats. Some useful new report formats based on Rasch modeling -the Modified Variable Map, the Ordinal Map, the Threshold Map, and the Annotated Ordinal Map - are illustrated using data from the IMYMS project. The Rasch analysis and the derived reporting formats avoid the pitfalls that exist when working with ordinal data and provide insights into the respondents' views about their experiences in schools unavailable by other approaches.

Teacher and peer assessment of creativity in technology education

This study, part of a PhD thesis, investigates a number of aspects relating to technology education, creativity and the assessment of creativity and aesthetics. Following tuitional sessions, panels of upper primary school children were involved in assessing the creative and aesthetic characteristics of technological products made by other children. Teachers assessed a selection of student drawings for creativity and these results were compared against the corresponding products assessed by the panels of Year 5 children. Subjects were administered a test on their knowledge of technology and these scores were compared to product creativity scores. The results showed high correlations between the assessor ranks for both creativity and aesthetics although there was generally more consistency with creativity. While some subjects produced both creative drawings and products, others showed creativity in only one outcome. A further finding of the investigation identified the relationship between students' knowledge of technology and the creative product constructed by the older children in the study.

Broadcasting technology and its influence on sport broadcaster inter-organisational relationship formation

Technical developments in television have resulted in major changes to the delivery of sport. One significant change is the development of relationships between clubs and sport broadcasters. This research identified the technology that is emerging in sport broadcasting, and the impact that this technology has on the potential for Inter-Organisational Relationship (IOR) formation between sport broadcasters and Australian-based professional football clubs, taken from the perspective of the sport broadcaster. Six preconditions for IOR formation were considered, including uncertainty, knowledge/expertise, resource acquisition, adaptive efficiency, regulation and strategic enhancement. In-depth interviews with senior managers of eight sport broadcasting organisations were undertaken with the resulting data analysed, and the emergent themes identified. Results indicate that sport broadcasters were not willing to enter into IORs with professional football clubs.

Conversations with the public : the role of journalists and public relations practitioners in creating civil discourses in non-metropolitan settings

This research deconstructs the relationship between journalists and public relations practitioners operating in non-metropolitan contexts. In identifying the specific differences in the way this relationship is defined within these contexts the research highlights the impact of these differences on the conversations  these media professionals have with their publics. Ultimately this relationship is see to be a key definer of the nature of the civil discourses within these non-metropolitan communities.

History of contact and change in the Goroka Valley, Central Highlands of New Guinea, 1934-1949

The thesis traces the interaction of the Goroka Valley people with European and coastal New Guinean intruders during the pacification stage of contact and change. In this 15 year period the people moved from a traditional subsistence culture to the threshold of a modern, European-influenced technological society. The contact experiences of the inhabitants of the Valley and the outsiders who influenced them are examined, using both oral and documentary sources. A central theme of this study is the attempts by Europeans and their coastal New Guinean collaborators to achieve the pacification of a people for whom warfare has been described as 'the dominant orientation'. The newcomers saw pacification as being inextricably linked with social, economic and religious transformation, and consequently it was pursued by patrol officers, missionaries and soldiers alike. Following an introductory chapter outlining the pre-contact and early-contact history of the Goroka Valley people, there is a discussion of the causes of tribal fighting in Highlands communities and two case studies of violent events which, although occurring beyond the Goroka Valley, had important consequences for those who lived within its bounds. The focus then shifts to the first permanent settlement of the agents of change -initially these were coastal New Guinean evangelists and policemen - and their impact on the local people. A period of consolidation is then described, as both government and missions established a permanent 'European presence in the Valley'. This period was characterised by vigorous pacification coupled with the introduction of innovations in health and education, agriculture, technology, law and religion. The gradual transformation of Goroka Valley society as a result of the people's interaction with the newcomers was abruptly accelerated in 1943, when many hundreds of Allied soldiers occupied the Valley in anticipation of a threatened Japanese invasion. Village life was disrupted as men were conscripted as carriers and labourers and whole communities were obliged to grow food to assist the Allied war effort. Those living close to military airfields-and camps were subject to Japanese aerial attacks and the entire population was exposed to an epidemic of bacillary dysentery introduced by the combatants. However the War also brought some positive effects, including paradoxically, the almost total cessation of tribal fighting, the construction of an ail-weather airstrip at Goroka which ensured its future as a town and administrative and commercial centre, and the compulsory growing of vegetables, coffee, etc, which laid the foundations for a cash economy and material prosperity. The final chapter examines the aftermath of military occupation, the return of civil administration and the implementation of social and economic policies which brought the Goroka Valley people into the rapid-development phase of contact. By 1949 Gorokans were ready to channel their aggressive energies into commercial competitiveness and adopt a cash-crop economy, to accept the European rule of law, to take advantage of Western innovations in medicine, education, transport and communications, to seek employment opportunities at home and in other parts of the country and to modify their primal world view with European religious and secular values. A Stone Age people was in process of being transformed into a modern society.

Rethinking curriculum, assessment and reporting in a technology-rich school environment

This research presents a portrait of a school experiencing the dilemmas and tensions of adapting to new technology. Teachers, parents and students' reactions to, and involvement in, the defining of the 'learning community' of the school is analysed and documented as multimodal reporting of student learning and progress is introduced.

Subject cultures and pedagogy : comparing mathematics and science

This research found that a teacher is both a member of a culture and an individual, building practice within parameters set by a dynamic and multifaceted subject culture. Feelings of competence and confidence grow as an aesthetic understanding of what it means to know, teach, and appreciate a subject.

Australian subject gateways, the successes and the challenges

The paper provides an overview of subject gateway development in Australia and takes a closer look at three subject gateways coordinated by the University of Queensland: AustLit: Australian Literature Gateway; AVEL Sustainability Knowledge Network, an engineering and sustainable development gateway; and WebLaw, a gateway for legal professionals. The challenges facing subject gateways are examined, including interoperability, coordination and most significantly, sustainability. The paper concludes with the overarching questions being considered by gateway coordinators such as the place of subject gateways and their future given trends in the evolution of the web.