title: A power-saving modulation technique for time-of-flight range imaging sensors

authors: Conroy, Richard M.

subjects: time of flight

abstract: Time-of-flight range imaging cameras measure distance and intensity simultaneously for every pixel in an image. With the continued advancement of the technology, a wide variety of new depth sensing applications are emerging; however a number of these potential applications have stringent electrical power constraints that are difficult to meet with the current state-of-the-art systems. Sensor gain modulation contributes a significant proportion of the total image sensor power consumption, and as higher spatial resolution range image sensors operating at higher modulation frequencies (to achieve better measurement precision) are developed, this proportion is likely to increase. The authors have developed a new sensor modulation technique using resonant circuit concepts that is more power efficient than the standard mode of operation. With a proof of principle system, a 93–96% reduction in modulation drive power was demonstrated across a range of modulation frequencies from 1–11 MHz. Finally, an evaluation of the range imaging performance revealed an improvement in measurement linearity in the resonant configuration due primarily to the more sinusoidal shape of the resonant electrical waveforms, while the average precision values were comparable between the standard and resonant operating modes.

text: A power-saving modulation technique for time-of-flight range imaging sensors Time-of-flight range imaging cameras measure distance and intensity simultaneously for every pixel in an image. With the continued advancement of the technology, a wide variety of new depth sensing applications are emerging; however a number of these potential applications have stringent electrical power constraints that are difficult to meet with the current state-of-the-art systems. Sensor gain modulation contributes a significant proportion of the total image sensor power consumption, and as higher spatial resolution range image sensors operating at higher modulation frequencies (to achieve better measurement precision) are developed, this proportion is likely to increase. The authors have developed a new sensor modulation technique using resonant circuit concepts that is more power efficient than the standard mode of operation. With a proof of principle system, a 93–96% reduction in modulation drive power was demonstrated across a range of modulation frequencies from 1–11 MHz. Finally, an evaluation of the range imaging performance revealed an improvement in measurement linearity in the resonant configuration due primarily to the more sinusoidal shape of the resonant electrical waveforms, while the average precision values were comparable between the standard and resonant operating modes.

year: 2011

title: Building organisational commitment to counteract brain drain from southern hemisphere accountancy firms

authors: Hooks, Jill

subjects: human resource management

abstract: With countries increasingly thinking like organisations as they recruit and retain global talent, it is posited that High Commitment Management (HCM) Human Resource Management (HRM) systems could be applied to help stem the brain drain, particularly in highly mobile/low organisational commitment professions such as Accountancy. In an online survey, 1,520 expatriate accounting professionals indicated whether they would return to New Zealand, current pushes and pulls on their career intentions, and changes needed to enhance pull forces back to New Zealand. The paper discusses these issues and explores how the evidence gathered can be used to improve commitment to accountancy firms thus, developing the profession in an Asia Pacific country.

text: Building organisational commitment to counteract brain drain from southern hemisphere accountancy firms With countries increasingly thinking like organisations as they recruit and retain global talent, it is posited that High Commitment Management (HCM) Human Resource Management (HRM) systems could be applied to help stem the brain drain, particularly in highly mobile/low organisational commitment professions such as Accountancy. In an online survey, 1,520 expatriate accounting professionals indicated whether they would return to New Zealand, current pushes and pulls on their career intentions, and changes needed to enhance pull forces back to New Zealand. The paper discusses these issues and explores how the evidence gathered can be used to improve commitment to accountancy firms thus, developing the profession in an Asia Pacific country.

year: 2007

title: The timing of the human discovery and colonization of New Zealand

authors: Sutton, Douglas G.

abstract: In discriminating between the proposed Long, Short and Intermediate Chronologies for New Zealand prehistory, archaeologists have recently voted by a narrow majority that the human commensal, Rattus exulans, was present in New Zealand up to 2000 years BP, although the preferred date of ‘first settlement’ by people was ca 800 years BP. A recalibration of New Zealand chronometric data has resulted in reinterpretations of the date and duration of occupation on critical archaeological sites. A remodelling of the ages of the putatively earliest sites in New Zealand has shown these to indicate only a broadly defined period when settlement occurred rather than the date when New Zealand was discovered (as the Short Chronology advocates have insisted). Finally, comparisons with archaeological research on islands elsewhere in the world have brought with them recognition that the discovery, exploration, initial settlement and colonization of New Zealand by Polynesian voyagers were broadly consecutive processes. This paper reviews a range of current evidence in the context of its current theorization and affirms the Long Chronology, recognizing it as the most plausible hypothesis.

text: The timing of the human discovery and colonization of New Zealand In discriminating between the proposed Long, Short and Intermediate Chronologies for New Zealand prehistory, archaeologists have recently voted by a narrow majority that the human commensal, Rattus exulans, was present in New Zealand up to 2000 years BP, although the preferred date of ‘first settlement’ by people was ca 800 years BP. A recalibration of New Zealand chronometric data has resulted in reinterpretations of the date and duration of occupation on critical archaeological sites. A remodelling of the ages of the putatively earliest sites in New Zealand has shown these to indicate only a broadly defined period when settlement occurred rather than the date when New Zealand was discovered (as the Short Chronology advocates have insisted). Finally, comparisons with archaeological research on islands elsewhere in the world have brought with them recognition that the discovery, exploration, initial settlement and colonization of New Zealand by Polynesian voyagers were broadly consecutive processes. This paper reviews a range of current evidence in the context of its current theorization and affirms the Long Chronology, recognizing it as the most plausible hypothesis.

year: 2008