Some reactions of 2-vinyl heterocycles with allenyl 1, 3-diesters. An approach to the nagilactone skeleton

Imperial Users onl

New perspectives on the IPv6 transition

Despite it being more than a decade old, and nearly two decades since the problems with IPv4 were first identified, IPv6 still has not diffused significantly through the Internet. Policies advocating market forces to promote IPv6 diffusion are widespread, and thus this paper examines IPv6 adoption from the perspectives of Hotelling's aconomics of exhaustible resources and the economics of permit markets, concluding in both cases that significant IPv6 diffusion will not occur until after the IPv4 address space is exhausted. This outcome is not desirable, and therefore new policy alternatives must be debated

Issues relating to the low uptake of Networks Of Workstations for commercial applications

Networks of Workstations are a new approach to parallel computing which promise performance gains and more efficient use of resources, resulting in lower technology costs. Despite these benefits, there are anecdotal reports that the business community has been reluctant to use the technology and that the adoption rate of cluster computing for commercial applications remains extremely low. These anecdotal reports are confirmed. Some concerns preventing the commercial usage of Networks of Workstations are revealed, however these concerns are contrary to the experiences of those organisations that have implemented the technology

Towards an Asian structured cable planning model

Organisations may find themselves having to replace cabling after a relatively short period if subsequent communications technologies do not operate over the installed media, resulting in costly disruption. Difficulties predicting which media will be dominant in the future are exacerbated because copper, fibre, and wireless all currently have their proponents. This research identifies factors that will form the basis of a statistical model that could be used to improve media selection decision-making. Further research to develop this model is outlined

Two economic perspectives on the IPv6 transition

Purpose – IPv6 is the replacement for the Internet’s incumbent protocol, IPv4. IPv6 adoption is required to allow the Internet to continue to grow; however, there has been almost no uptake since its standardisation in the late 1990s. This paper seeks to explain how this non-adoption may be a consequence of current policies paradoxically intended to promote IPv6. Design/methodology/approach – Economic theories of exhaustible resources and permit markets are used to provide an explanation for the lack of adoption of IPv6. Findings – The current policy approach will not yield a significant adoption of IPv6 until after the IPv4 address space is exhausted and may also constrain Internet growth after IPv4 exhaustion occurs. Practical implications – Current policies intended to promote IPv6 diffusion through the Internet must be reconsidered. The economics of permit markets in particular can inform discussions about IPv4 address transfer markets. Originality/value – Economic analyses of IPv6 adoption are almost non-existent and very few prior studies are known. This paper helps to rectify this important gap in the literature

Australian IPv6 Readiness: Results of a National Survey

IPv6 is the replacement for the Internet’s incumbent protocol, IPv4. Although exhaustion of the IPv4 address space is now imminent there has been no meaningful uptake of IPv6 since its standardisation in 1998. Data from a national survey of the top 1,000 IT user organisations in Australia are analysed, revealing that they have made little or no preparation for IPv6. This creates the potential for considerable disadvantage for Australian organisations. The author recommends that governments and regulatory bodies should consider regulatory or policy action to encourage the diffusion of IPv6. The author also recommends that enterprise organisations develop a long-term IPv6 strategy, implement IPv6 training programs, update their policy frameworks, and assess their IT assets and applications portfolios

The influence of internet use on identity in Asia: a social psychological approach

George Herbert Mead suggested that identity is constructed rather than fixed, a notion taken up by Erving Goffman in his detailed analysis of social interaction (Goffman, 1059). Goffman described social behaviour using a theatrical metaphor in which roles are performed for an audience. Role descriptions describe how to behave and interact; it is the detail of such descriptions that is socially negotiated during identity construction. This construction can be considered as a tension between internal and external forces.Not all identities are equally malleable during the identity construction process; those identities strongly influenced by internalised norms and values, or by embodiment, are resistant to change (although change is not impossible). Others, such as professional identity, are much more flexible.A considerable portion of the literature relating to identity online examines gender, yet gender is one of the more change-resistant aspects of identity. However there are many other aspects to identity that are more likely to be influenced by the different social interactions to which Internet-use exposes us.This paper uses interview data from university students from a number of Asian countries to explore which aspects of their identities are most influenced by social interactions made possible by the Internet. The findings suggest that identity construction is indeed influenced by Internet use, although not necessarily in a uniform way

A Comparison of Attitudes to Ipv6 in Three Countries

Internet Protocol (IP), the underlying protocol upon which the Internet is based, has a number of serious flaws, including limited address space, security and performance limitations. Since the early 1990s a new version of IP (IPv6) has been developed in which these problems are addressed. Yet despite years of “hype”, adoption of IPv6 has been minimal or non-existent. Many efforts have been made to encourage IPv6 adoption around the world but none have been widely successful.The decision to adopt is influenced by the information available to the decision maker. This paper reports the results of studies of attitudes and perceptions to IPv6 in three countries and determines that the prevalent information about the standard in each country is often scarce and inaccurate. This contributes to reluctance to adopt IPv6 and further exacerbates the problem. The paper concludes with recommendations to improve available information so as to increase IPv6 acceptance and adoption

A survey of structured cabling in mainland China

Selection of the cabling media to be used is often difficult, and installation of vertical and horizontal structured cabling is costly and disruptive. Bandwidth, distance requirements, immunity to interference, security, installation disruption and future technology should all be considered when selecting appropriate transmission media. Further, organisational characteristics such as industry, network size, and budget may also influence the cabling selection.In order to maximise ROI, organizations want to avoid replacing infrastructure after a short time-span, and thus want to ensure that future technologies will operate over the chosen media. However, this is problematic because there are currently no clear industry favourite transmission media; previous research has shown that copper, fibre, and wireless media all have their proponents who are equally adamant that their particular medium is the best choice.Research described in this paper reports which factors influence the cable selection decision in mainland China. The findings can be used to improve cable decision selection in the future

On the value of data mining tools

Improvements in ICTs lead to increasingly high bandwidth becoming widely available, allowing large volumes of data to be moved easily over vast distances. CEOs, CIOs, CFOs and managers in organisations can access increasingly large volumes of data to provide a knowledge basis for making important decisions. As the volume of data grows, making sense it becomes increasingly difficult. Data mining is used to extract useful knowledge from large, fuzzy datasets. There are many different data mining models, such as decision trees, neural networks, clustering, prediction, K-nearest neighbour, and association analysis.Many software vendors have developed data mining tools, based on sophisticated algorithms. To understand how these algorithms work requires considerable technical knowledge that is beyond many IT practitioners. This paper poses the question of how much value such tools are to practitioners who do not have the technical background to fully understand the software and interpret the results.This issue is investigated by comparing two tools based on the decision tree model. Preliminary results suggest that current data mining tools are of limited value to users without considerable knowledge of statistics and data mining