title: Evaluating soil and landscape models to predict liquefaction susceptibility in the Hinuera Formation, Hamilton Basin

authors: McKay, Aleesha

subjects: liquefaction

abstract: Cone Penetration Tests (CPT) derived from the Hamilton section of the Waikato Expressway were analysed within CLiqTM software. The derived Liquefaction Potential Index (LPI) from each CPT was then combined with LIDAR, pedological and geological maps for statistical analysis. A soil model that incorporates the conditions of modern soil development with these derived LPI values was developed as a preliminary assessment tool for liquefaction potential within Hamilton Basin soils. The model shows that liquefaction is more likely to occur on interfluvial areas where there is little topographical relief. Pedological soils with high organic component are also a likely indicator of high liquefaction susceptibility.

text: Evaluating soil and landscape models to predict liquefaction susceptibility in the Hinuera Formation, Hamilton Basin Cone Penetration Tests (CPT) derived from the Hamilton section of the Waikato Expressway were analysed within CLiqTM software. The derived Liquefaction Potential Index (LPI) from each CPT was then combined with LIDAR, pedological and geological maps for statistical analysis. A soil model that incorporates the conditions of modern soil development with these derived LPI values was developed as a preliminary assessment tool for liquefaction potential within Hamilton Basin soils. The model shows that liquefaction is more likely to occur on interfluvial areas where there is little topographical relief. Pedological soils with high organic component are also a likely indicator of high liquefaction susceptibility.

year: 2017

title: Measured impact of crooked traceroute

authors: Luckie, Matthew John

subjects: computer science

abstract: Data collected using traceroute-based algorithms underpins research into the Internet’s router-level topology, though it is possible to infer false links from this data. One source of false inference is the combination of per-flow load-balancing, in which more than one path is active from a given source to destination, and classic traceroute, which varies the UDP destination port number or ICMP checksum of successive probe packets, which can cause per-flow load-balancers to treat successive packets as distinct flows and forward them along different paths. Consequently, successive probe packets can solicit responses from unconnected routers, leading to the inference of false links. This paper examines the inaccuracies induced from such false inferences, both on macroscopic and ISP topology mapping. We collected macroscopic topology data to 365k destinations, with techniques that both do and do not try to capture load balancing phenomena.We then use alias resolution techniques to infer if a measurement artifact of classic traceroute induces a false router-level link. This technique detected that 2.71% and 0.76% of the links in our UDP and ICMP graphs were falsely inferred due to the presence of load-balancing. We conclude that most per-flow load-balancing does not induce false links when macroscopic topology is inferred using classic traceroute. The effect of false links on ISP topology mapping is possibly much worse, because the degrees of a tier-1 ISP’s routers derived from classic traceroute were inflated by a median factor of 2.9 as compared to those inferred with Paris traceroute.

text: Measured impact of crooked traceroute Data collected using traceroute-based algorithms underpins research into the Internet’s router-level topology, though it is possible to infer false links from this data. One source of false inference is the combination of per-flow load-balancing, in which more than one path is active from a given source to destination, and classic traceroute, which varies the UDP destination port number or ICMP checksum of successive probe packets, which can cause per-flow load-balancers to treat successive packets as distinct flows and forward them along different paths. Consequently, successive probe packets can solicit responses from unconnected routers, leading to the inference of false links. This paper examines the inaccuracies induced from such false inferences, both on macroscopic and ISP topology mapping. We collected macroscopic topology data to 365k destinations, with techniques that both do and do not try to capture load balancing phenomena.We then use alias resolution techniques to infer if a measurement artifact of classic traceroute induces a false router-level link. This technique detected that 2.71% and 0.76% of the links in our UDP and ICMP graphs were falsely inferred due to the presence of load-balancing. We conclude that most per-flow load-balancing does not induce false links when macroscopic topology is inferred using classic traceroute. The effect of false links on ISP topology mapping is possibly much worse, because the degrees of a tier-1 ISP’s routers derived from classic traceroute were inflated by a median factor of 2.9 as compared to those inferred with Paris traceroute.

year: 2011-01

title: A Māori homeless woman

authors: Groot, Shiloh Ann Maree

subjects: Māori

abstract: Indigenous peoples are overrepresented in homeless populations in many countries. As part of a larger ethnographic project, this case study draws upon interviews and photoelicitation projects with a homeless Māori woman, Ariā. The actions of this Māori woman exemplify how Indigenous cultural practices can shape a person’s efforts to retain a positive sense of self and place while homeless. Māori cultural concepts relating to caring, leadership, unity, relationships, spirituality, history and place provide a basis for interpreting Ariā’s actions. This article demonstrates the appropriateness of cultural concepts indigenous to a group for conducting ethnographic research into homelessness within that group.

text: A Māori homeless woman Indigenous peoples are overrepresented in homeless populations in many countries. As part of a larger ethnographic project, this case study draws upon interviews and photoelicitation projects with a homeless Māori woman, Ariā. The actions of this Māori woman exemplify how Indigenous cultural practices can shape a person’s efforts to retain a positive sense of self and place while homeless. Māori cultural concepts relating to caring, leadership, unity, relationships, spirituality, history and place provide a basis for interpreting Ariā’s actions. This article demonstrates the appropriateness of cultural concepts indigenous to a group for conducting ethnographic research into homelessness within that group.

year: 2011-09