title: Development and Basic Calibration of an Acoustic Vector Network Analyser

authors: MacDonell, Marcus Scott Glengarry

subjects: Vector Network Analysis

abstract: This project aims to develop a method that drastically improves measurement of the acoustic properties of objects. Previously research at the University of Waikato has made progress with acoustic technologies as a precursor to a dual port vector network analyser. These technologies have been furthered to this end by 3D printing a modified coupler that now includes a flange with alignment pins, and a groove to house an O-ring as well as a number of other ``custom'' components for the coupler assembly. This assembly has been interfaced successfully with a VNA and collected data, this process is not straightforward and requires carefully thought-out adjustment to produce sensible data. Complicating this process is the vast difference in propagation speeds for acoustic and electromagnetic signals. The swept measurements performed show promising results that further prove the hardware and indicate that particular calibration terms namely those for isolation that are normally ignored in the electromagnetic domain are potentially crucial in the acoustic domain.

text: Development and Basic Calibration of an Acoustic Vector Network Analyser This project aims to develop a method that drastically improves measurement of the acoustic properties of objects. Previously research at the University of Waikato has made progress with acoustic technologies as a precursor to a dual port vector network analyser. These technologies have been furthered to this end by 3D printing a modified coupler that now includes a flange with alignment pins, and a groove to house an O-ring as well as a number of other ``custom'' components for the coupler assembly. This assembly has been interfaced successfully with a VNA and collected data, this process is not straightforward and requires carefully thought-out adjustment to produce sensible data. Complicating this process is the vast difference in propagation speeds for acoustic and electromagnetic signals. The swept measurements performed show promising results that further prove the hardware and indicate that particular calibration terms namely those for isolation that are normally ignored in the electromagnetic domain are potentially crucial in the acoustic domain.

year: 2017

title: Improving the Evaluation of Network Anomaly Detection Using a Data
Fusion Approach

authors: Löf, Andreas

subjects: network anomaly detection

abstract: Currently, the evaluation of network anomaly detection methods is often not repeatable. It is difficult to ascertain if different implementations of the same methods have the same performance or the relative performance of different methods. This is in part due to a lack of open implementations, the absence of recent datasets and no common format to express results.

A common approach to evaluating a method is to use the Defense Advanced Research Projects Agency (DARPA) 1999 datasets, or a derivative of them, in combination with a different dataset or network capture. The DARPA datasets are relatively old and bear little resemblance to modern day traffic and the other datasets are unlabelled and typically publicly unavailable making it difficult to ascertain the validity of the research evaluated in such a way.

This thesis primarily contributes a new evaluation methodology that uses a data fusion based approach that allows for reproducible evaluations with modern datasets.

The new methodology incorporates three other contributions: A new way to capture network traces that are fully anonymised yet retains more information than any current network traces and a new trace annotation format and a method for verifying the correctness of the annotations.

The DARPA 1999 dataset was used to demonstrate the validity of the approach and an evaluation was performed on a new dataset that has been captured using the methods introduced. In the evaluation we find that methodology is a viable approach forward, but that it comes with a different set of drawbacks than the current state of the art.

text: Improving the Evaluation of Network Anomaly Detection Using a Data
Fusion Approach Currently, the evaluation of network anomaly detection methods is often not repeatable. It is difficult to ascertain if different implementations of the same methods have the same performance or the relative performance of different methods. This is in part due to a lack of open implementations, the absence of recent datasets and no common format to express results.

A common approach to evaluating a method is to use the Defense Advanced Research Projects Agency (DARPA) 1999 datasets, or a derivative of them, in combination with a different dataset or network capture. The DARPA datasets are relatively old and bear little resemblance to modern day traffic and the other datasets are unlabelled and typically publicly unavailable making it difficult to ascertain the validity of the research evaluated in such a way.

This thesis primarily contributes a new evaluation methodology that uses a data fusion based approach that allows for reproducible evaluations with modern datasets.

The new methodology incorporates three other contributions: A new way to capture network traces that are fully anonymised yet retains more information than any current network traces and a new trace annotation format and a method for verifying the correctness of the annotations.

The DARPA 1999 dataset was used to demonstrate the validity of the approach and an evaluation was performed on a new dataset that has been captured using the methods introduced. In the evaluation we find that methodology is a viable approach forward, but that it comes with a different set of drawbacks than the current state of the art.

year: 2013

title: Governance and legitimacy: Indigenous development in Aotearoa

authors: Dodd, Materoa

subjects: Māori governance

abstract: Within the indigenous paradigm lies a paradox over what constitutes legitimate Māori authority: Iwi structures are legitimated and recognised by the state, and traditional forms (for example, Hapū and Māori women), have had their authority diminished. Iwi authorities are colonial constructs that diminish the rights of Hapū and Māori women. The manner in which such constructs have come about generally has not involved tribewide debate over important issues in which Hapū and Māori women have an interest. For their legitimacy, emergent self-governing structures will need to be grounded in principles that ensure legitimate representation of Māori people and not socially constructed hybrids of a colonial past. Structures need to recognise Hapū and Māori women in the formulation, anything less than this will trigger a legitimation crisis.

text: Governance and legitimacy: Indigenous development in Aotearoa Within the indigenous paradigm lies a paradox over what constitutes legitimate Māori authority: Iwi structures are legitimated and recognised by the state, and traditional forms (for example, Hapū and Māori women), have had their authority diminished. Iwi authorities are colonial constructs that diminish the rights of Hapū and Māori women. The manner in which such constructs have come about generally has not involved tribewide debate over important issues in which Hapū and Māori women have an interest. For their legitimacy, emergent self-governing structures will need to be grounded in principles that ensure legitimate representation of Māori people and not socially constructed hybrids of a colonial past. Structures need to recognise Hapū and Māori women in the formulation, anything less than this will trigger a legitimation crisis.

year: 2000-10