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Full-Text Articles in Social and Behavioral Sciences
The Network Centric Environment Viewed Through The Lens Of Activity Theory, Irena Ali, Leoni Warne, Helen M. Hasan
The Network Centric Environment Viewed Through The Lens Of Activity Theory, Irena Ali, Leoni Warne, Helen M. Hasan
Faculty of Commerce - Papers (Archive)
A network centric (NC) environment has the potential to transform the ways in which people gather, share, and process information with connectivity achieved thorough technological and social networks. This is of relevance to the military environment which is
characterised by constant change and uncertainty, and exposed to the vagaries of the political and economic climate. This chapter will analyse human activities in the military network centric context
through the lens of the Cultural-Historical Activity Theory. Based on current research findings it is proposed that the activity of sense-making is central to common awareness and decision making, through information sharing, in …
Systems Resemblance And Workpractice Evolution: Implications For Work Activity (Re)Design, Rodney J. Clarke
Systems Resemblance And Workpractice Evolution: Implications For Work Activity (Re)Design, Rodney J. Clarke
Faculty of Commerce - Papers (Archive)
This paper is concerned with addressing the question of how apparently disparate and unconnected systems can resemble each other. The question of what counts as a systems resemblance necessitates developing contextual workpractice descriptions associated with the systems features and ultimately entire systems. Using systemic semiotics an apparent ontogenetic convergence between entirely different systems is used to show that systems resemblance can be inferred when the constituent workpractices of information systems consist of comparable register features and especially if they exhibit comparable generic features. The implications of these findings for a new class of work activity (re)design practices are considered.
Articulating Knowledge Work: The Contributions Of Activity Theory And Task-Based Knowledge Management, Henry Linger, Frada Burstein, Helen M. Hasan
Articulating Knowledge Work: The Contributions Of Activity Theory And Task-Based Knowledge Management, Henry Linger, Frada Burstein, Helen M. Hasan
Faculty of Commerce - Papers (Archive)
This chapter addresses issues of knowledge work in organisations with a concern that mainstream knowledge management (KM) has fallen short of expectations. The real nature of knowledge work remains hidden, and thus inaccessible, to those who are trying to improve organisational outcomes through KM practices. The authors have conducted independent research within a new discourse on knowledge work in the context of modem complex organisations, the results of which are converging to a common understanding of this critical phenomenon. Their two theoretical frameworks, one task-based and one activity-based, are described here as eminently suited to this research. Two sets of …
Inter-Activity: An Activity Theory Model For Socio-Technical Work Spaces, Alanah Kazlauskas, Kate Crawford
Inter-Activity: An Activity Theory Model For Socio-Technical Work Spaces, Alanah Kazlauskas, Kate Crawford
Faculty of Commerce - Papers (Archive)
The issues that face human society are often addressed in a sociotechnical context that utilizes both social and technical tools. Such socio-technical milieux do not just happen but evolve over time. The ongoing emergence of more and more complex socio-technical contexts presents challenges to those involved as well as for sociocultural researchers. Vygotsky's (1978) Cultural Historical Activity Theory has been expanded upon by a number of researchers including Engestrom (1999) in order to develop understandings of work-based activity systems with a view to the identification of tensions within and to further development of those activity systems. Other researchers (Lave & …
Enzyme Activity And Flexibility At Very Low Hydration, V Kurkal, R M. Daniel, John L. Finney, Moeava Tehei, R V. Dunn, Jeremy C. Smith
Enzyme Activity And Flexibility At Very Low Hydration, V Kurkal, R M. Daniel, John L. Finney, Moeava Tehei, R V. Dunn, Jeremy C. Smith
Faculty of Science, Medicine and Health - Papers: part A
Recent measurements have demonstrated enzyme activity at hydrations as low as 3%. This raises the question of whether hydration-induced enzyme flexibility is important for activity. Here, to address this, picosecond dynamic neutron scattering experiments are performed on pig liver esterase powders at 0%, 3%, 12%, and 50% hydration by weight and at temperatures ranging from 120 to 300 K. At all temperatures and hydrations, significant quasielastic scattering intensity is found in the protein, indicating the presence of anharmonic, diffusive motion. As the hydration increases, a temperature-dependent dynamical transition appears and strengthens involving additional diffusive motion. The implication of these results …
Replication Termination In Escherichia Coli: Structure And Anti-Helicase Activity Of The Tus-Ter Complex, Cameron Neylon, Andrew V. Kralicek, Thomas M. Hill, Nicholas E. Dixon
Replication Termination In Escherichia Coli: Structure And Anti-Helicase Activity Of The Tus-Ter Complex, Cameron Neylon, Andrew V. Kralicek, Thomas M. Hill, Nicholas E. Dixon
Faculty of Science, Medicine and Health - Papers: part A
The arrest of DNA replication in Escherichia coli is triggered by the encounter of a replisome with a Tus protein-Ter DNA complex. A replication fork can pass through a Tus-Ter complex when traveling in one direction but not the other, and the chromosomal Ter sites are oriented so replication forks can enter, but not exit, the terminus region. The Tus-Ter complex acts by blocking the action of the replicative DnaB helicase, but details of the mechanism are uncertain. One proposed mechanism involves a specific interaction between Tus-Ter and the helicase that prevents further DNA unwinding, while …
Water Loss As A Function Of Energy Intake, Physical Activity And Season, Klaas R. Westerterp, Guy Plasqui, Annalies H. C Goris
Water Loss As A Function Of Energy Intake, Physical Activity And Season, Klaas R. Westerterp, Guy Plasqui, Annalies H. C Goris
Faculty of Social Sciences - Papers (Archive)
Although water is an important nutrient, there are no recommended intake values. Here, water intake, energy intake, physical activity and water loss was measured over 1 week in summer and in winter. Subjects were healthy volunteers, forty-two women and ten men, mean age of 29 (sd 7) years and mean BMI 21·8 (sd 2·2) kg/m2. Water intake was measured with a 7 d food and water record. Physical activity level (PAL) was observed as the ratio of total energy expenditure, as measured with doubly labelled water, to resting energy expenditure as measured in a respiration chamber. Water loss …
Eliciting And Specifying Requirements For Highly Interactive Systems Using Activity Theory, Robert B. K. Brown, Peter Hyland, Ian C. Piper
Eliciting And Specifying Requirements For Highly Interactive Systems Using Activity Theory, Robert B. K. Brown, Peter Hyland, Ian C. Piper
Faculty of Engineering and Information Sciences - Papers: Part A
The processes of eliciting user requirements and formalising these into specifications are critical for the success of highly interactive systems. These processes are still poorly understood, partly because current methods are usually ad hoc and lack any theoretical basis. A number of researchers have used Activity Theory (AT) to refine these processes and have met with some success. To date, this approach has been more useful explaining the processes post hoc. This positional paper proposes an AT method for requirement elicitation and specification definition. The method is sufficiently prescriptive and well formed that it does not require any detailed understanding …
Socio-Technical Systems: From Individual Transactions To Situated Community Activity, Helen M. Hasan
Socio-Technical Systems: From Individual Transactions To Situated Community Activity, Helen M. Hasan
Faculty of Commerce - Papers (Archive)
Although basic concepts of Activity Theory were articulated almost a century ago, they have stood the test of time and are proving to be appropriate for research into modem situation involving the use of socio-technical systems. Over the past decades the field of Information Systems has advanced from a focus on routine transaction processing systems to more sophisticated applications that support situated community activity. This chapter will describe how Activity Theory is becoming increasing relevant to these types of systems and can be complemented by other approaches such as Complexity Theory and a particular Knowledge Lens. Research is presented that …
A Survey Of Martian Dust Devil Activity Using Mars Global Surveyor Mars Orbiter Camera Images, Jenny A. Fisher, Mark I. Richardson, Claire E. Newman, Mark A. Szwast, Chelsea Graf, Shabari Basu, Shawn P. Ewald, Anthony D. Toigo, R. John Wilson
A Survey Of Martian Dust Devil Activity Using Mars Global Surveyor Mars Orbiter Camera Images, Jenny A. Fisher, Mark I. Richardson, Claire E. Newman, Mark A. Szwast, Chelsea Graf, Shabari Basu, Shawn P. Ewald, Anthony D. Toigo, R. John Wilson
Faculty of Science - Papers (Archive)
A survey of dust devils using the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide- and narrow-angle (WA and NA) images has been undertaken. The survey comprises two parts: (1) sampling of nine broad regions from September 1997 to July 2001 and (2) a focused seasonal monitoring of variability in the Amazonis region, an active dust devil site, from March 2001 to April 2004. For part 1, dust devils were identified in NA and WA images, and dust devil tracks were identified in NA images. Great spatial variability in dust devil occurrence is highlighted, with Amazonis Planitia being the …
An Activity Theory Analysis Of A Case Of It-Driven Organisational Change, Wannapa Suratmethakul, Helen Hasan
An Activity Theory Analysis Of A Case Of It-Driven Organisational Change, Wannapa Suratmethakul, Helen Hasan
Faculty of Commerce - Papers (Archive)
The paper describes unexpected problems encountered in the automation of a scheduling process using an IT application already in use in other similar organisations. A grounded theory approach was used to collect and categorise data on the case. Activity Theory was then used to analyse the attempt by management to implement organisational change through the introduction of the system. The findings suggest that it is inadvisable to impose organisational change through the introduction of a complex IT system, particularly when this disrupts entrenched decision-making processes of the organisation.
Geomagnetic Activity Forcing Of The Northern Annular Mode Via The Stratosphere, Daniel Palamara, Edward Bryant
Geomagnetic Activity Forcing Of The Northern Annular Mode Via The Stratosphere, Daniel Palamara, Edward Bryant
Faculty of Science, Medicine and Health - Papers: part A
We consider various aspects of the link between solar-modulated geomagnetic activity and the Northern Annular Mode (NAM). Our results indicate that the geomagnetic forcing of atmospheric circulation in the Northern Hemisphere is temporally and seasonally restricted, modulated by the Quasi-Biennial Oscillation (QBO), and reliant on stratosphere-troposphere coupling. When the data are restricted to January values after 1965, for years in which the January QBO is eastwards, the correlation coefficient between the geomagnetic AA index and the NAM is 0.85. These results can account for many of the enigmatic features of Northern Hemisphere circulation.
Learning And Doing In Communities: Understanding Knowledge Management Through The Lens Of Activity Theory, Helen M. Hasan
Learning And Doing In Communities: Understanding Knowledge Management Through The Lens Of Activity Theory, Helen M. Hasan
Faculty of Commerce - Papers (Archive)
No abstract provided.
Known 'Bugs' In Cultural Historical Activity Theory, John G. Findlay
Known 'Bugs' In Cultural Historical Activity Theory, John G. Findlay
Faculty of Commerce - Papers (Archive)
When Cultural-Historical Activity Theory (CHAT) was first propounded by the Vygotskian school of Russian psychologists in the 1920s it offered a robust explanation of how human development is mediated by cultural as well as biological influences. Along the way, CHAT has acquired some "bugs" or usability difficulties by remaining isolated from other theories that have a common heritage. This paper explores how the theory may have evolved if Vygotsky was alive today. Revisions to CHAT are proposed that borrow from complexity theory, innovation theory, group dynamics and Flow theory to explain the evolution of minds, tools and cultures as a …
Government Business Process Analysis With Activity Theory, Peter A. J Larkin
Government Business Process Analysis With Activity Theory, Peter A. J Larkin
Faculty of Commerce - Papers (Archive)
Activity Theory tells us that a motivated person or group performs an activity directed at an object in order to transform the object into desired outcomes to fulfil a need. It also tells us that instruments and the community mediate human activity. The New South Wales state parliament in Australia performs the activity of creating Acts and those Acts prescribe within them the objects of the Act and the desired outcomes. To achieve the desired outcomes, the Act will establish or constitute the necessary instruments. This paper describes an application of Yrjo Engestrom's Activity Theory model, or structure of human …
Activity As A Unit Of Analysis For Knowledge Management Frameworks, Leoni Warne, Irena Ali, Helen Hasan
Activity As A Unit Of Analysis For Knowledge Management Frameworks, Leoni Warne, Irena Ali, Helen Hasan
Faculty of Commerce - Papers (Archive)
The authors of this paper take the view that knowledge management is a set of practices for systematically adding value to the knowlege of individuals, which is generated and shaped through interaction with others. It is therefore appropriate that knowledge management research be conducted in the context of particular organisations, focusing on local activities. To that end two of the authors have conducted a four-year research program investigating the factors in organizations that enhance and enable the assimilation, generation, sharing and building of knowledge that transfonns an organization into a learning organization. Human activities in organisational contexts have been analysed …
Endogenous Redox Activity In Mouse Spermatozoa And Its Role In Regulating The Tyrosine Phosphorylation Events Associated With Sperm Capacitation, Heath W. Ecroyd, Russell C. Jones, Robert J. Aitken
Endogenous Redox Activity In Mouse Spermatozoa And Its Role In Regulating The Tyrosine Phosphorylation Events Associated With Sperm Capacitation, Heath W. Ecroyd, Russell C. Jones, Robert J. Aitken
Faculty of Science - Papers (Archive)
We investigated the role of endogenous redox activity in regulating the signal transduction pathway leading to tyrosine phosphorylation in mouse spermatozoa. Endogenous redox activity was monitored using a luminol-peroxidase chemiluminescent probe. Chemiluminescence increased in spermatozoa that were actively undergoing cAMP-mediated tyrosine phosphorylation events associated with capacitation and was inhibited in a dose-dependent manner by addition of catalase or diphenylene iodonium, both of which also inhibited tyrosine phosphorylation within the cell at points downstream of cAMP. Excluding bicarbonate from the incubation medium reduced the redox activity of sperm by 80-90% and dramatically reduced tyrosine phosphorylation. This study provides the first evidence …
Website Usability In Context: An Activity Theory Based Usability Testing Method, Lejla Vrazalic
Website Usability In Context: An Activity Theory Based Usability Testing Method, Lejla Vrazalic
Faculty of Commerce - Papers (Archive)
Traditional laboratory based usability testing methodologies are plagued with shortcomings which affect the results of the testing process and their validity. The results of a preliminary study of this type of usability testing with 34 users indicate two categories of key shortcomings. A new summative website usability testing methodology based on the notion of distributed usability and Activity Theory is presented as a means of overcoming these problems. This paper describes the theoretical foundations and development of the methodology which is currently being evaluated and refined.
Environmental Factors Associated With Adults' Participation In Physical Activity: A Review, Nancy Humpel, Neville Owen, Eva Leslie
Environmental Factors Associated With Adults' Participation In Physical Activity: A Review, Nancy Humpel, Neville Owen, Eva Leslie
Faculty of Social Sciences - Papers (Archive)
Background: Promoting physical activity is a public health priority, and changes in the environmental contexts of adults’ activity choices are believed to be crucial. However, of the factors associated with physical activity, environmental influences are among the least understood. Method: Using journal scans and computerized literature database searches, we identified 19 quantitative studies that assessed the relationships with physical activity behavior of perceived and objectively determined physical environment attributes. Findings were categorized into those examining five categories: accessibility of facilities, opportunities for activity, weather, safety, and aesthetic attributes. Results: Accessibility, opportunities, and aesthetic attributes had significant associations with physical activity. …
Can Motivational Signs Prompt Increases In Incidental Physical Activity In An Australian Health-Care Facility?, A L. Marshall, A E. Bauman, C Patch, J Wilson, J Chen
Can Motivational Signs Prompt Increases In Incidental Physical Activity In An Australian Health-Care Facility?, A L. Marshall, A E. Bauman, C Patch, J Wilson, J Chen
Faculty of Health and Behavioural Sciences - Papers (Archive)
This study aimed to evaluate whether a stairpromoting signed intervention could increase the use of the stairs over the elevator in a health-care facility. A time-series design was conducted over 12 weeks. Data were collected before, during and after displaying a signed intervention during weeks 4–5 and 8–9. Evaluation included anonymous counts recorded by an objective unobtrusive motion-sensing device of people entering the elevator or the stairs. Self-report data on stair use by hospital staff were also collected. Stair use significantly increased after the first intervention phase (P 0.02), but after the intervention was removed stair use decreased back towards …
Physical Activity, Change In Blood Pressure And Predictors Of Mortality In Older South Africans - A 2-Year Follow-Up Study, Karen E. Charlton, Estelle V. Lambert, Judith Kreft
Physical Activity, Change In Blood Pressure And Predictors Of Mortality In Older South Africans - A 2-Year Follow-Up Study, Karen E. Charlton, Estelle V. Lambert, Judith Kreft
Faculty of Science, Medicine and Health - Papers: part A
Objective. A 2-year follow-up study of a cohort of 200 historically disadvantaged older South Africans was conducted to: (i) characterise current levels of habitual physical activity; (ii) relate physical activity to current risk factors for chronic disease; and (iii) identify risk factors associated with 2-year mortaJity. The baseline sample, drawn in 1993, was found to have a high prevalence of hypertension (71.7%). Research design. Retrospective cohort study. Methods. A baseline sample of 200 persons aged ;:;.. 65 years, resident in the Cape Peninsula, was randomly drawn by means of a two-stage cluster design. Baseline measurements included: anthropometry, waist/hip ratio, systolic …