title: Measuring and characterising inbound sessions in residential DSL traffic

authors: Alcock, Shane

subjects: DSL

abstract: It has been assumed that the need for successful NAT traversal discourages residential DSL users from running services or applications that require them to accept connections from remote hosts. However, there are now numerous approaches for NAT traversal but there have been no studies measuring the prevalence of DSL users accepting inbound sessions. This paper presents an analysis of TCP and UDP flows initiated by remote clients to a group of residential DSL users, using packet traces captured from a New Zealand ISP between 2009 and 2011. Our analysis reveals that over half of all measured users accepted at least one inbound TCP or UDP session. There was no dominant port being used to accept sessions and port usage was spread over thousands of different ports. Skype and BitTorrent were the most popular application protocols observed and had increased in popularity over time. We also report on the use of dual SYNs to perform TCP NAT traversal in our data.

text: Measuring and characterising inbound sessions in residential DSL traffic It has been assumed that the need for successful NAT traversal discourages residential DSL users from running services or applications that require them to accept connections from remote hosts. However, there are now numerous approaches for NAT traversal but there have been no studies measuring the prevalence of DSL users accepting inbound sessions. This paper presents an analysis of TCP and UDP flows initiated by remote clients to a group of residential DSL users, using packet traces captured from a New Zealand ISP between 2009 and 2011. Our analysis reveals that over half of all measured users accepted at least one inbound TCP or UDP session. There was no dominant port being used to accept sessions and port usage was spread over thousands of different ports. Skype and BitTorrent were the most popular application protocols observed and had increased in popularity over time. We also report on the use of dual SYNs to perform TCP NAT traversal in our data.

year: 2011

title: Agglomeration externalities and 1981-2006 regional growth in Brazil

authors: Matlaba, Valente José

subjects: Convergence

abstract: This paper focuses on manufacturing employment growth across the 26 states of Brazil. We employ the Glaeser et al. (1992) approach to identify the role played by knowledge externalities in growth and convergence. To assess robustness of the results, we compare cross-section models, dynamic panel models and pooled-periods fixed-effect models. We find that cross-section models confirm the positive impact of Porter’s and Jacobs’ competition externalities on growth, whereas dynamic panel models and pooled-periods fixed-effect models are consistent with the predictions of Marshall-Arrow-Romer and Porter regarding the role of specialisation in manufacturing vis-à-vis other employment. The results provide new insights into the rapid growth since 1981 in particularly the North and Centre West of Brazil.

text: Agglomeration externalities and 1981-2006 regional growth in Brazil This paper focuses on manufacturing employment growth across the 26 states of Brazil. We employ the Glaeser et al. (1992) approach to identify the role played by knowledge externalities in growth and convergence. To assess robustness of the results, we compare cross-section models, dynamic panel models and pooled-periods fixed-effect models. We find that cross-section models confirm the positive impact of Porter’s and Jacobs’ competition externalities on growth, whereas dynamic panel models and pooled-periods fixed-effect models are consistent with the predictions of Marshall-Arrow-Romer and Porter regarding the role of specialisation in manufacturing vis-à-vis other employment. The results provide new insights into the rapid growth since 1981 in particularly the North and Centre West of Brazil.

year: 2012-06

title: Engaging and working with Maori? Effective practice for psychologists in education

authors: Glynn, Ted

subjects: New Zealand

abstract: I believe this whakatauki captures the reflective processes I am now engaged in, as I assess where I have come from and where I am going, as a second-generation pakeha of Irish descent, who completed postgraduate degrees in Psychology and Education in New Zealand and Canada, and who has been engaging and working with Māori in the field of education for many years.

text: Engaging and working with Maori? Effective practice for psychologists in education I believe this whakatauki captures the reflective processes I am now engaged in, as I assess where I have come from and where I am going, as a second-generation pakeha of Irish descent, who completed postgraduate degrees in Psychology and Education in New Zealand and Canada, and who has been engaging and working with Māori in the field of education for many years.

year: 2008