Tuwhera Research Repository

The Tuwhera Research Repository provides sustainable open access and archiving to a broad range of AUT produced research - theses, research outputs and datasets.

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Recent Submissions

Access status: Open Access ,
Do Liquid Assets Lure Managers? Evidence From Corporate Misconduct
(Wiley, 2022-01-25) Zaman, Rashid; Atawnah, Nader; Nadeem, Muhammad; Bahadar, Stephen; Shakri, Irfan Haider
We examine the effect of asset redeployability on corporate misconduct and find a significant positive relationship. Utilizing a large sample of public US firms for the period of 2001 to 2015, we find that a one standard deviation (SD) increase in the proportion of redeployable assets leads to a 7.2% increase in corporate fines. We also find that the positive association between asset redeployability and corporate misconduct varies across types of misconduct and industrial heterogeneity. In our channel analysis, we find that managerial risk-taking is a potential mechanism through which asset redeployability is associated with misconduct. Additional tests reveal that corporate misconduct associated with asset redeployability leads to lower firm value. Our results remained robust in a series of sensitivity tests and continue to hold after accounting for potential endogeneity concerns. Our paper contributes to the ongoing discourse on the costs and benefits of asset redeployability.
Access status: Open Access ,
Control Strategies of DC Microgrids Cluster: A Comprehensive Review
(MDPI, 2021-11-12) Al-Tameemi, Zaid Hamid Abdulabbas; Lie, Tek Tjing; Foo, Gilbert; Blaabjerg, Frede
Multiple microgrids (MGs) close to each other can be interconnected to construct a cluster to enhance reliability and flexibility. This paper presents a comprehensive and comparative review of recent studies on DC MG clusters’ control strategies. Different schemes regarding the two significant control aspects of networked DC MGs, namely DC-link voltage control and power flow control between MGs, are investigated. A discussion about the architecture configuration of DC MG clusters is also provided. All advantages and limitations of various control strategies of recent studies are discussed in this paper. Furthermore, this paper discusses three types of consensus protocol with different time boundaries, including linear, finite, and fixed. Based on the main findings from the reviewed studies, future research recommendations are proposed.
Access status: Open Access ,
Looking Into the Black Box of “Medical Innovation”: Rising Health Expenditures by Illness Type
(Springer, 2022-03-17) Breyer, Friedrich; Lorenz, Normann ; Pruckner, Gerald J.; Schober, Thomas
There is agreement among health economists that on the whole medical innovation causes health care expenditures (HCE) to rise. This paper analyzes for which diagnoses HCE per patient have grown significantly faster than average HCE. We distinguish decedents (patients in their last 4 years of life) from survivors and use a unique dataset comprising detailed HCE of all members of a regional health insurance fund in Upper Austria for the period 2005–2018. Our results indicate that among decedents in particular, the expenditures for treatment of neoplasms have exceeded the general trend in HCE. This confirms that medical innovation for this group of diseases has been particularly strong over the last 15 years. For survivors, we find a noticeable growth in cases and cost per case for pregnancies and childbirth, and also for treatment of mental and behavioral disorders. We discuss whether these findings contradict the widespread interpretation of cost-increasing innovations as “medical progress” and offer some policy recommendations.
Access status: Open Access ,
Analogue Relics - The Imprint of Making
(Auckland University of Technology, 2026) Garvey, Paul; Hajian, George; Ford, Becky
This research asks how analogue making might expose tensions within the abstract digital systems that people live with today. Through a process of media archaeology, obsolete media and tools are reintroduced to contemporary design practice through transmediation, creating a digital analogue hybrid that extracts the new from the familiar. This research uses nostalgia as a critical lens rather than something sentimental by reasserting material resistance through methods involving 16mm film and ZipZap machines to provoke analogue instability; in doing so, failure is reintroduced into systems that seek perfection. These failures or ‘glitches’ suggest the materiality of media, helping to expose material traces often erased in digital production, revealing the hidden labour and invisible systems that underpin digital capitalism.
Access status: Open Access ,
Video Watermarking With Digital Signature and Fingerprinting
(IGI Global, 2023-03) Gupta, Milan; Yan, Wei Qi
A digital watermark, which is embedded in an image sequence or video frames as the form of a binary string or visual logo, is a small size of visible data. Thus, the quality of embedded videos is often slashed due to the watermarking. Comparative video watermarking is a highly innovative method that was designed to unravel this issue. In this chapter, the authors make use of singular value decomposition (SVD) and discrete wavelet transform (DWT) for video watermarking; the authors employed inverse transform (IDWT) to extract the video watermark. The digital signature is also utilised to increase the authenticity of watermarks and verify any changes. The authors combine this approach with digital fingerprinting as well as to get the improved results. Throughout the designed attacks, the merits of the new watermarking paradigm such as robustness, convergence, and stability are attained with security and authenticity by calculating the metrics such as MSE, PSNR, entropy, SSIM, etc.