title: 'Seeing' the toddler: Voices or voiceless?

authors: White, Elizabeth Jayne

subjects: Early childhood education

abstract: Is ‘seeing’ believing? What comprises the focus of seeing, how is it seen and who decides what is to be privileged in doing so? Such is the dilemma facing all observational investigations since what can be ‘seen’ is always impaired or enhanced by what each person brings to their gaze—be it frameworks or ideologies that limit or create potential. How much more challenging is such seeing when the subject of our gaze is an infant or toddler who speaks a distinct corporeal language that has long been forgotten by the adult, and who draws from a sociocultural domain that is only partially glimpsed by the early childhood teacher or researcher? In this chapter I expand on the idea of ‘seeing’ as a dialogic endeavour—thus calling for an exploration of voice that goes beyond singular monologic parameters, into the polyphonic terrain of speculation, uncertainty and reflexivity. Taking this approach, I argue that there is potential to re-vision the very young child as a competent yet vulnerable communicator of and with many voices, one who is capable of conveying complex meaning through genres that strategically orient them towards or away from intersubjective harmony.

text: 'Seeing' the toddler: Voices or voiceless? Is ‘seeing’ believing? What comprises the focus of seeing, how is it seen and who decides what is to be privileged in doing so? Such is the dilemma facing all observational investigations since what can be ‘seen’ is always impaired or enhanced by what each person brings to their gaze—be it frameworks or ideologies that limit or create potential. How much more challenging is such seeing when the subject of our gaze is an infant or toddler who speaks a distinct corporeal language that has long been forgotten by the adult, and who draws from a sociocultural domain that is only partially glimpsed by the early childhood teacher or researcher? In this chapter I expand on the idea of ‘seeing’ as a dialogic endeavour—thus calling for an exploration of voice that goes beyond singular monologic parameters, into the polyphonic terrain of speculation, uncertainty and reflexivity. Taking this approach, I argue that there is potential to re-vision the very young child as a competent yet vulnerable communicator of and with many voices, one who is capable of conveying complex meaning through genres that strategically orient them towards or away from intersubjective harmony.

year: 2011

title: An investigation of soil moisture associated with ephemeral streams, Wright Valley, Antarctica

authors: Shanhun, Fiona L.

abstract: Ephemeral streams in Wright Valley, Antarctica, are fed by glacial melt and flow for between four and ten weeks annually. Hyporheic zones develop concomitantly with ephemeral stream channels. These zones are areas of saturated or moistened soil, depending on their proximity to the stream. The hyporheic zones are laterally extensive, and may represent a greater proportion of total meltwater than surface water in the stream channel, thus exacerbating the risk of accidental contamination of streams. The hydrological system in Wright Valley is closed, with streams flowing inland to Lake Vanda via the Onyx River. 

This study aimed to quantify the extent to which liquid moisture was present in soils associated with Goodspeed Stream, in order to better predict the vulnerability of stream margins to impacts of human activities. Soil samples were collected from transects across the Goodspeed lower alluvial fan and analysed for gravimetric moisture content, electrical conductivity, and particle size distribution. A pedotransfer function was used to estimate soil moisture potential in order to show the direction of water movement across the lower alluvial fan. Climate data including air temperature, soil temperature, and total solar radiation were measured; stream flow in Goodspeed Stream was estimated. 

The Goodspeed Stream near-stream and extended hyporheic zones were identified. Distal components of the hyporheic zone were also identified at distances of up to 7 4 m from Goodspeed Stream. 

Soil gravimetric moisture content increased with soil depth and proximity to Goodspeed Stream. Distal components of the hyporheic zone observed at distances of 21, 59 and 74 m from Goodspeed Stream had relatively high gravimetric moisture contents (up to 7%; 88 in visibly dry soils was 0.6%). The distal hyporheic zones have the potential to develop into flowing stream channels during periods of increased melt. 

Soil electrical conductivity ranged from 34 - 10520 μSiem. Salts precipitated at the soil surface were concentrated at the western-most edge of the extended hyporheic zone and on raised bar features across the fan, highlighting zones of movement and evaporation of soil moisture. The particle size distribution of the <2 mm fraction was relatively uniform across the fan, being dominated by medium sand (45%). 

Soil moisture potential decreased with distance from Goodspeed Stream, indicating that small spills occurring outside the extended hyporheic zone would be driven laterally across the fan, away from the stream. Spills within the extended hyporheic may be incorporated into Goodspeed Stream. Large spills anywhere on the Goodspeed lower alluvial fan would migrate downwards to ice cement before flowing down-slope under gravity towards the Onyx River. 

Areas vulnerable to accidental spills and physical disturbance were highlighted on oblique photographs. Three vulnerability zones were identified based predominantly on the observed extent and movement of soil moisture. Zone 1 designates stream channels or surface waters and near-stream hyporheic zones, Zone 2 encompasses extended hyporheic zones, while Zone 3 applies to soils of alluvial fans, including distal hyporheic zones. Recommendations were made as to the types of activities permissible in each of the three zones.

text: An investigation of soil moisture associated with ephemeral streams, Wright Valley, Antarctica Ephemeral streams in Wright Valley, Antarctica, are fed by glacial melt and flow for between four and ten weeks annually. Hyporheic zones develop concomitantly with ephemeral stream channels. These zones are areas of saturated or moistened soil, depending on their proximity to the stream. The hyporheic zones are laterally extensive, and may represent a greater proportion of total meltwater than surface water in the stream channel, thus exacerbating the risk of accidental contamination of streams. The hydrological system in Wright Valley is closed, with streams flowing inland to Lake Vanda via the Onyx River. 

This study aimed to quantify the extent to which liquid moisture was present in soils associated with Goodspeed Stream, in order to better predict the vulnerability of stream margins to impacts of human activities. Soil samples were collected from transects across the Goodspeed lower alluvial fan and analysed for gravimetric moisture content, electrical conductivity, and particle size distribution. A pedotransfer function was used to estimate soil moisture potential in order to show the direction of water movement across the lower alluvial fan. Climate data including air temperature, soil temperature, and total solar radiation were measured; stream flow in Goodspeed Stream was estimated. 

The Goodspeed Stream near-stream and extended hyporheic zones were identified. Distal components of the hyporheic zone were also identified at distances of up to 7 4 m from Goodspeed Stream. 

Soil gravimetric moisture content increased with soil depth and proximity to Goodspeed Stream. Distal components of the hyporheic zone observed at distances of 21, 59 and 74 m from Goodspeed Stream had relatively high gravimetric moisture contents (up to 7%; 88 in visibly dry soils was 0.6%). The distal hyporheic zones have the potential to develop into flowing stream channels during periods of increased melt. 

Soil electrical conductivity ranged from 34 - 10520 μSiem. Salts precipitated at the soil surface were concentrated at the western-most edge of the extended hyporheic zone and on raised bar features across the fan, highlighting zones of movement and evaporation of soil moisture. The particle size distribution of the <2 mm fraction was relatively uniform across the fan, being dominated by medium sand (45%). 

Soil moisture potential decreased with distance from Goodspeed Stream, indicating that small spills occurring outside the extended hyporheic zone would be driven laterally across the fan, away from the stream. Spills within the extended hyporheic may be incorporated into Goodspeed Stream. Large spills anywhere on the Goodspeed lower alluvial fan would migrate downwards to ice cement before flowing down-slope under gravity towards the Onyx River. 

Areas vulnerable to accidental spills and physical disturbance were highlighted on oblique photographs. Three vulnerability zones were identified based predominantly on the observed extent and movement of soil moisture. Zone 1 designates stream channels or surface waters and near-stream hyporheic zones, Zone 2 encompasses extended hyporheic zones, while Zone 3 applies to soils of alluvial fans, including distal hyporheic zones. Recommendations were made as to the types of activities permissible in each of the three zones.

year: 2005

title: Mana Motuhake Ringa: The non-invasive neural interface based artificial hand

authors: Owen, Mahonri W.

subjects: Prosthetics

abstract: Ten million people on the earth at any given time suffer from the loss or lack of a limb. Three million of these are upper extremity amputees. No matter the cause or reason for amputation the amputees’ life is never the same again. Independence can be lost and never regained. The loss of a limb can be an overpowering event that effects the mental, social, and physical well-being of a person. Although there has been many attempts to restore hand function through neural prosthetics there is little to no credible solutions to regain it. This thesis presents methods to restore hand function based on the human grasping system and addresses key challenges in the practical application of those methods. The contribution of this work lies in improving artificial hand function by mimicking the human grasping system. The human grasping system consists of the brain, the nervous system and the hand. The methods used investigate: biomechanical design principles for artificial hands, the limitations of machine learning in non-invasive neural interfaces (NI’s) and the development of an autonomous hand control framework for artificial hand control. 

The application of the Support Vector Machine (SVM) to a non-invasive neural interface is principally limited to binary applications in the real world. In order to overcome this limitation an autonomous approach is developed to achieve better response and accuracy from NI control frameworks. In binary applications the SVM performed well with a classification accuracy of around 80% accompanied by a response time of just under 5 seconds. When applied to multiple classifications the SVM decreased in accuracy and response dramatically. The accuracy of the autonomous hand control framework had a classification accuracy of 95% with a response time comparable to that of the SVM. This outcome has the potential to move non-invasive NI research into the real world and to restore hand function in an intuitive and meaningful way. A key learning of this research is that machine learning methods for non-invasive neural interfaces are not the best way to restore hand function for amputees. Hand function is best restored through the combining of machine learning and machine vision into a single NI based control framework. Additionally, this work is based in Mātauranga Māori with a western science approach. By so doing, amputees will be empowered, have increased independence and enjoy a better quality of life.

The scope of this work is limited to the consideration of hand function restoration for upper extremity amputees. In particular trans-radial amputees. Focus is given to non-invasive methods of control, therefore, investigations are limited to the electroencephalography (EEG) signal. Mimicking the human grasping system is a complex and difficult process, therefore, the attempts in this work to restore hand function only consider mechanisms and processes related directly to the motor control of the human hand.

text: Mana Motuhake Ringa: The non-invasive neural interface based artificial hand Ten million people on the earth at any given time suffer from the loss or lack of a limb. Three million of these are upper extremity amputees. No matter the cause or reason for amputation the amputees’ life is never the same again. Independence can be lost and never regained. The loss of a limb can be an overpowering event that effects the mental, social, and physical well-being of a person. Although there has been many attempts to restore hand function through neural prosthetics there is little to no credible solutions to regain it. This thesis presents methods to restore hand function based on the human grasping system and addresses key challenges in the practical application of those methods. The contribution of this work lies in improving artificial hand function by mimicking the human grasping system. The human grasping system consists of the brain, the nervous system and the hand. The methods used investigate: biomechanical design principles for artificial hands, the limitations of machine learning in non-invasive neural interfaces (NI’s) and the development of an autonomous hand control framework for artificial hand control. 

The application of the Support Vector Machine (SVM) to a non-invasive neural interface is principally limited to binary applications in the real world. In order to overcome this limitation an autonomous approach is developed to achieve better response and accuracy from NI control frameworks. In binary applications the SVM performed well with a classification accuracy of around 80% accompanied by a response time of just under 5 seconds. When applied to multiple classifications the SVM decreased in accuracy and response dramatically. The accuracy of the autonomous hand control framework had a classification accuracy of 95% with a response time comparable to that of the SVM. This outcome has the potential to move non-invasive NI research into the real world and to restore hand function in an intuitive and meaningful way. A key learning of this research is that machine learning methods for non-invasive neural interfaces are not the best way to restore hand function for amputees. Hand function is best restored through the combining of machine learning and machine vision into a single NI based control framework. Additionally, this work is based in Mātauranga Māori with a western science approach. By so doing, amputees will be empowered, have increased independence and enjoy a better quality of life.

The scope of this work is limited to the consideration of hand function restoration for upper extremity amputees. In particular trans-radial amputees. Focus is given to non-invasive methods of control, therefore, investigations are limited to the electroencephalography (EEG) signal. Mimicking the human grasping system is a complex and difficult process, therefore, the attempts in this work to restore hand function only consider mechanisms and processes related directly to the motor control of the human hand.

year: 2019