title: Towards Internet scale simulation

authors: McGregor, Anthony James

subjects: Discrete Event Simulation

abstract: Simulation of the Internet has long been understood to be very challenging mostly because of its scale, diversity and the lack of detailed knowledge of many of its components. However, two recent developments (macroscopic topology discovery and large memory servers) mean that some of these problems are now more tractable. Although problems like the lack of detailed link information remain, models are are useful for some problems that require an understanding of how an application interacts with the Internet as a whole. The paper presents is-0, an Internet Simulator. is-0 derives its model of Internet topology directly from the output of an Internet topology mapping project. Efficient design allows is-0 to simulate packet-by-packet, hop-by-hop behaviour at Internet scale. Validation of is-0, an example application and performance measurements are included.

text: Towards Internet scale simulation Simulation of the Internet has long been understood to be very challenging mostly because of its scale, diversity and the lack of detailed knowledge of many of its components. However, two recent developments (macroscopic topology discovery and large memory servers) mean that some of these problems are now more tractable. Although problems like the lack of detailed link information remain, models are are useful for some problems that require an understanding of how an application interacts with the Internet as a whole. The paper presents is-0, an Internet Simulator. is-0 derives its model of Internet topology directly from the output of an Internet topology mapping project. Efficient design allows is-0 to simulate packet-by-packet, hop-by-hop behaviour at Internet scale. Validation of is-0, an example application and performance measurements are included.

year: 2011

title: Decolouring bloodmeal: Consumption and potential recycling of peracetic acid

authors: Hicks, Talia

abstract: A method of deodorizing and decolouring bloodmeal using an equilibrium mixture of peracetic acid, hydrogen peroxide, acetic acid and water has been developed to improve its marketability as a source of protein for bioplastics.
The objective of this study was to determine what quantity of peracetic acid is required to give reasonable bleaching of the bloodmeal and determine whether there is potential for the wastewater to be recycled. This was carried out by measuring the quantity of chemical species in the initial equilibrium mixture and the resulting wastewater upon bleaching using volumetric analysis. Bleaching efficacy was determined after exposing 100 g bloodmeal to 1.1, 2.5, 3.6, 4.5 and 5.6 wt% peracetic acid solutions as either 300 g total solution or a constant molar equivalent of 2.2 mmol peracetic acid/g bloodmeal and using a chromameter to measure colour change.
Addition of 300 g 5.6 wt% peracetic acid solution resulted in effective bleaching. This represented a ratio of 2.20 mmol peracetic acid/g bloodmeal of which 1.4 mmol peracetic acid/g bloodmeal was consumed (63%). If 300 g <2.5 wt% peracetic acid solution was used, there was insufficient bleaching. If >300 g of <2.5 wt% solution is added such that there is still 2.2 mmol peracetic acid/g bloodmeal, bleaching is still insufficient.
These results suggest that an excess of peracetic is required for bleaching to occur, and that its concentration is paramount to bleaching efficacy. Due to the excess of peracetic acid used in the bleaching process, there is potential for wastewater recycling to be carried out provided that the wastewater is not diluted.

text: Decolouring bloodmeal: Consumption and potential recycling of peracetic acid A method of deodorizing and decolouring bloodmeal using an equilibrium mixture of peracetic acid, hydrogen peroxide, acetic acid and water has been developed to improve its marketability as a source of protein for bioplastics.
The objective of this study was to determine what quantity of peracetic acid is required to give reasonable bleaching of the bloodmeal and determine whether there is potential for the wastewater to be recycled. This was carried out by measuring the quantity of chemical species in the initial equilibrium mixture and the resulting wastewater upon bleaching using volumetric analysis. Bleaching efficacy was determined after exposing 100 g bloodmeal to 1.1, 2.5, 3.6, 4.5 and 5.6 wt% peracetic acid solutions as either 300 g total solution or a constant molar equivalent of 2.2 mmol peracetic acid/g bloodmeal and using a chromameter to measure colour change.
Addition of 300 g 5.6 wt% peracetic acid solution resulted in effective bleaching. This represented a ratio of 2.20 mmol peracetic acid/g bloodmeal of which 1.4 mmol peracetic acid/g bloodmeal was consumed (63%). If 300 g <2.5 wt% peracetic acid solution was used, there was insufficient bleaching. If >300 g of <2.5 wt% solution is added such that there is still 2.2 mmol peracetic acid/g bloodmeal, bleaching is still insufficient.
These results suggest that an excess of peracetic is required for bleaching to occur, and that its concentration is paramount to bleaching efficacy. Due to the excess of peracetic acid used in the bleaching process, there is potential for wastewater recycling to be carried out provided that the wastewater is not diluted.

year: 2012

title: Street health: Practitioner service provision for Maori homeless people in Auckland

authors: Nikora, Linda Waimarie

abstract: Drawing insights from interviews with Maori homeless people, health professionals, and relevant local and international literatures, this chapter focuses on the provision of medical care to homeless people. In particular, we propose that health services orientate to accommodate the worldviews and circumstances of Maori homeless people. Below we consider colonialism and societal developments that have led to homelessness among Maori today. We then present a case study of ‘Grant’, which was compiled from common aspects of various Maori homeless people who access health services at the Auckland City Mission (ACM); an organisation with a long history of catering to the needs and hopes of dispossessed groups, providing food, clothing, advocacy, social and health services. The relational orientation of healthcare at the ACM is discussed, and leads to an exploration of ‘judgement-free service space’ for meeting client needs (cf., Trussell & Mair, 2010). Lastly, we focus on how health professionals can respond to the multiple healthcare needs of Maori homeless people, in partnership with social services.

text: Street health: Practitioner service provision for Maori homeless people in Auckland Drawing insights from interviews with Maori homeless people, health professionals, and relevant local and international literatures, this chapter focuses on the provision of medical care to homeless people. In particular, we propose that health services orientate to accommodate the worldviews and circumstances of Maori homeless people. Below we consider colonialism and societal developments that have led to homelessness among Maori today. We then present a case study of ‘Grant’, which was compiled from common aspects of various Maori homeless people who access health services at the Auckland City Mission (ACM); an organisation with a long history of catering to the needs and hopes of dispossessed groups, providing food, clothing, advocacy, social and health services. The relational orientation of healthcare at the ACM is discussed, and leads to an exploration of ‘judgement-free service space’ for meeting client needs (cf., Trussell & Mair, 2010). Lastly, we focus on how health professionals can respond to the multiple healthcare needs of Maori homeless people, in partnership with social services.

year: 2012-09