title: Insider threat modeling: An adversarial risk analysis approach

authors: Joshi, Chaitanya

abstract: Insider threats entail major security issues in geopolitics, cyber security and business organizations. Most earlier work in the field has focused on standard game theoretic approaches. We provide here two alternative, more realistic models based on adversarial risk analysis (ARA). ARA does not assume common knowledge and solves the problem from the point of view of just one of the players, the defender (typically), taking into account their knowledge and uncertainties regarding the choices available to them, to their adversaries, the possible outcomes, their payoffs/utilities and their opponents payoffs/utilities. The first model depicts the problem as a standard Defend-AttackDefend model. The second model segments the set of involved agents in three classes of users and considers both sequential as well as simultaneous actions. A data security example illustrates the discussion.

text: Insider threat modeling: An adversarial risk analysis approach Insider threats entail major security issues in geopolitics, cyber security and business organizations. Most earlier work in the field has focused on standard game theoretic approaches. We provide here two alternative, more realistic models based on adversarial risk analysis (ARA). ARA does not assume common knowledge and solves the problem from the point of view of just one of the players, the defender (typically), taking into account their knowledge and uncertainties regarding the choices available to them, to their adversaries, the possible outcomes, their payoffs/utilities and their opponents payoffs/utilities. The first model depicts the problem as a standard Defend-AttackDefend model. The second model segments the set of involved agents in three classes of users and considers both sequential as well as simultaneous actions. A data security example illustrates the discussion.

year: 2019

title: Distal occurrence of mid-Holocene Whakatane Tephra on the Chatham Islands, New Zealand, and potential for cryptotephra studies

authors: Holt, Katherine A.

subjects: New Zealand

abstract: The Whakatane Tephra, a rhyolitic tephra erupted ca. 5500 cal. BP from Okataina Volcanic Centre, central North Island, has been identified on the Chatham Islands which lie ˜900 km east of Christchurch, New Zealand. The visible tephra layer, ˜5 mm in thickness and preserved within peat on Pitt Island, was identified using both radiocarbon dating and analysis of glass shards by electron microprobe. Whakatane Tephra is the first Holocene tephra to be identified on the Chatham Islands, and it is the most distal Holocene tephra yet recorded in the New Zealand region, being ˜850 km from source. The Pitt Island occurrence extends the tephra's dispersal area markedly, by an order of magnitude, possibly to ˜300,000 km2. An estimated dispersal index (D) of approximately 105 km2 indicates that the eruption generated a very high plinian column, possibly exceeding ˜30 km in height, with strong winds blowing the ash plume southeastwards. This new discovery of distal Whakatane Tephra as a thin but visible layer strongly implies that cryptotephras are likely to be preserved on the Chatham Islands and within adjacent ocean floor sediments. Therefore the potential exists to develop enhanced cryptotephrostratigraphic records from these distal areas, which in turn would help facilitate precise correlation via tephrochronology of palaeoenvironmental records (such as NZ-INTIMATE) from mainland New Zealand, the southwest Pacific Ocean, and the Chatham Islands.

text: Distal occurrence of mid-Holocene Whakatane Tephra on the Chatham Islands, New Zealand, and potential for cryptotephra studies The Whakatane Tephra, a rhyolitic tephra erupted ca. 5500 cal. BP from Okataina Volcanic Centre, central North Island, has been identified on the Chatham Islands which lie ˜900 km east of Christchurch, New Zealand. The visible tephra layer, ˜5 mm in thickness and preserved within peat on Pitt Island, was identified using both radiocarbon dating and analysis of glass shards by electron microprobe. Whakatane Tephra is the first Holocene tephra to be identified on the Chatham Islands, and it is the most distal Holocene tephra yet recorded in the New Zealand region, being ˜850 km from source. The Pitt Island occurrence extends the tephra's dispersal area markedly, by an order of magnitude, possibly to ˜300,000 km2. An estimated dispersal index (D) of approximately 105 km2 indicates that the eruption generated a very high plinian column, possibly exceeding ˜30 km in height, with strong winds blowing the ash plume southeastwards. This new discovery of distal Whakatane Tephra as a thin but visible layer strongly implies that cryptotephras are likely to be preserved on the Chatham Islands and within adjacent ocean floor sediments. Therefore the potential exists to develop enhanced cryptotephrostratigraphic records from these distal areas, which in turn would help facilitate precise correlation via tephrochronology of palaeoenvironmental records (such as NZ-INTIMATE) from mainland New Zealand, the southwest Pacific Ocean, and the Chatham Islands.

year: 2011

title: Tukua Kia Rere! Maori Adult Students Succeeding at University

authors: Williams, Daphne Christina (Tina)

subjects: Maori students in higher education

abstract: A considerable amount of research has focussed on Māori underachievement in mainstream education. There is, however, much less research that celebrates Māori academic success. Even less has been written about the experiences of adult Māori students who return to study long after leaving school and go on to become academically successful in higher education. This study contributes to the growing body of knowledge regarding Māori academic success at university. It sought to explore the experiences of sixteen adult Māori students who entered university via special admission and went on to attain undergraduate degrees. The study examined the challenges that these individual’s experienced on their way to becoming academically successful and identified the main factors that helped them to achieve educational success. An overarching Kaupapa Māori theoretical framework was employed in this study. A qualitative research methodology was implemented and Kaupapa Māori research principles informed both the research processes and the interpretation of research outcomes. The findings suggest four major factors contributed to the success of the participants in this study: a strong determination to succeed (whāia te iti kahurangi), the extended family (whānau), strong social support networks with peers and faculty (whakawhanaungatanga) and Te Ao Māori (the Māori World). However, some of these same factors were also found to hinder academic success in the university setting. The Manu Tukutuku (kite) model was developed directly from the research findings. In addition to providing a theoretical frame for understanding the experiences of Māori special admission students at university, this model also provides a useful ‘toolkit’ for those wanting to support Māori students within the university context. The implications of this study suggest that New Zealand Universities can better support Māori special admission students by being more inclusive of their cultural capital, by eliminating racism and discrimination in the university environment and by fostering better relationships between staff and students. Creating opportunities for Māori students to develop social networks at University was also identified as important.

text: Tukua Kia Rere! Maori Adult Students Succeeding at University A considerable amount of research has focussed on Māori underachievement in mainstream education. There is, however, much less research that celebrates Māori academic success. Even less has been written about the experiences of adult Māori students who return to study long after leaving school and go on to become academically successful in higher education. This study contributes to the growing body of knowledge regarding Māori academic success at university. It sought to explore the experiences of sixteen adult Māori students who entered university via special admission and went on to attain undergraduate degrees. The study examined the challenges that these individual’s experienced on their way to becoming academically successful and identified the main factors that helped them to achieve educational success. An overarching Kaupapa Māori theoretical framework was employed in this study. A qualitative research methodology was implemented and Kaupapa Māori research principles informed both the research processes and the interpretation of research outcomes. The findings suggest four major factors contributed to the success of the participants in this study: a strong determination to succeed (whāia te iti kahurangi), the extended family (whānau), strong social support networks with peers and faculty (whakawhanaungatanga) and Te Ao Māori (the Māori World). However, some of these same factors were also found to hinder academic success in the university setting. The Manu Tukutuku (kite) model was developed directly from the research findings. In addition to providing a theoretical frame for understanding the experiences of Māori special admission students at university, this model also provides a useful ‘toolkit’ for those wanting to support Māori students within the university context. The implications of this study suggest that New Zealand Universities can better support Māori special admission students by being more inclusive of their cultural capital, by eliminating racism and discrimination in the university environment and by fostering better relationships between staff and students. Creating opportunities for Māori students to develop social networks at University was also identified as important.

year: 2010