Digital Commons Network^™

Terahertz-Driven Nonlinear Electrical Transport In Semiconductor Nanostructures, C. Zhang

Faculty of Engineering - Papers (Archive)

In this work, we used the quantum transport equation and density matrix formalism to calculate the frequency dependent electrical current of a two-dimensional electron gas directly driven by an intense terahertz laser. It is found that due to increased electron-photon coupling, the electron-impurity scattering decreases rapidly with the electric field.

Skill Acquisition In Transfer Of Manipulation Skills From Human To Machine Through A Haptic Virtual Environment, Y. Chen, F. Naghdy

Faculty of Informatics - Papers (Archive)

A new paradigm for programming a robotics manipulator is developed. It is intended that the teaching of the machine will begin with the necessary skills being demonstrated by the human operator in a virtual environment with tactile sensing (haptics). Position and contact force and torque data generated in the virtual environment combined with a priori knowledge about the task is used to identify and learn the skills in the newly demonstrated tasks and then to reproduce them in the robotics system. The peg-in-hole insertion problem is used as a case study. The overall concept is described. The methodologies developed to …

Selective Laser Excitation Spectroscopy Of Gallium And Phosphorous In Germanium, C. A. Freeth, R. A. Lewis

Faculty of Engineering - Papers (Archive)

Shallow impurity states of donors and acceptors in Ge have been investigated by far-infrared laser magnetospectroscopy. The Zeeman splitting of the impurity states produces resonant absorption of the laser radiation at certain magnetic fields. The data are compared to measurements made using a conventional spectrometer and good agreement is found.

A Grounded Theory Of The Leadership Process In A Large Government Bureaucracy, George K. Kriflik, R. Jones

Faculty of Commerce - Papers (Archive)

This paper presents a theory of the leadership process within the particular substantive setting of a large government bureaucracy. The study organisation (labelled AGRO) possesses a dominant engineering culture and has a history characterised by non- tumultuous change. The research methodology of orthodox grounded theory was employed. The main concern of the participants was found to be a desire to close the gap between their current work reality and that level they perceived themselves to be capable of achieving. This was resolved through the basic social process of Minimising Attainment Deficit. Leadership aspects of charisma and vision where not evident …

A Review Of Unquestioned Standards In Using Cluster Analysis For Data-Driven Market Segmentation, Sara Dolnicar

Faculty of Commerce - Papers (Archive)

Clustering is a highly popular and widely used tool for identifying or constructing databased market segments. Over decades of applying cluster analytical procedures for the purpose of searching for homogeneous subgroups among consumers, questionable standards of utilization have emerged, e.g. the non-explorative manner in which results from cluster analytic procedures are reported, the black-box approach ignoring crucial parameters of the algorithms applied or the lack of harmonization of methodology chosen and data conditions. The purpose of this study is threefold: (1) to investigate whether and which standards of application of cluster analysis have emerged in the academic marketing literature, (2) …

Strategic Brand Image Analysis For Heterogeneous Markets – Applying Dynamic Perceptions Based Market Segmentation (Dynpbms) To Dishwashing Brand Data, Sara Dolnicar

Faculty of Commerce - Papers (Archive)

The aim of this article is to illustrate the usefulness of an exploratory tool called dynamic perceptions based market segmentation (dynPBMS, based on the PBMS approach introduced by Mazanec and Strasser (2000) and Buchta, Dolnicar and Reutterer (2000)) for the investigation of image patterns in the marketplace as well as structural changes of such patterns over time. As starting point for analysis typical brand image data is used: repeated surveys questioning respondents about their evaluation of multiple brands with regard to multiple attributes. The advantages of using dynPBMS as compared to traditional tools applied in market structure analysis include (1) …

Developing On-Line Tools To Support Learners In Problem-Solving Activities, Gwyn Brickell, B. Harper, Brian Ferry

Faculty of Education - Papers (Archive)

In recent years, research has focused on understanding how learners can benefit from tools that can assist in the development of informal reasoning skills when constructing arguments in collaborative learning with web-based learning environments. A common approach taken by each of these systems is to use support mechanisms (scaffolding) to facilitate student learning through the development of improved reasoning and argumentation skills. The authors of this paper have been developing computer-based learning environments for the past ten years, and have developed several award winning CD-ROM packages that feature a range of cognitive tools designed to assist learning. The development of …

Implementing Generic Learning Designs Based Upon Quality Ict Exemplars, J. Hedberg, R. Oliver, Barry Harper, Sandra Wills, S. Agostinho

Faculty of Education - Papers (Archive)

Within the context of an AUTC funded Project: Information and Communication Technologies and Their Role in Flexible Learning, this paper presents an analysis of learning designs using ICTs and how this grounded approach might be a more useful structure to design effective learning environments. The project has developed generic or reusable frameworks for technology-enhanced high quality learning experiences in higher education and this paper will present several examples, of the original design and how the key elements were selected and developed for use by others. As this project is currently developing these generic exemplars of learning designs, the final presentation …

Societas Europaea: Harmonization Or Proliferation Of Corporations Law In The European Union?, J. M. Marychurch

Faculty of Law - Papers (Archive)

A significant development was made recently to the range of corporate forms available to businesses operating in the European Union (EU). A company's incorporation, regulation and dissolution had hitherto been the sole domain of the EU's member states. On 8 October 2001, this changed when Council Regulation (EC) No 2157/ 2001 on the Statute for a European Company (the Regulation) was adopted, making the form of a European company or Societas Europaea (SE) open to some businesses in the EU after the Regulation enters into effect. This article will examine the form and analyse the likely impact the national law …

The Changing Role Of Tutors: Forming A Community Of Practice In A Distributed Learning Environment, Geraldine E. Lefoe, J. Hedberg, C. Gunn

Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers

An evaluation of a distributed learning environment (DLE) of a regional NSW university provided the context to examine the changing role of tutors in new learning environments. It examines how the tutors started to form a community of practice in the first year of operation. The distance from the main campus made communication difficult for the tutors, lecturers and students and the use of information and communication technologies (ICT), at times, added to the challenge. This paper identifies ways that the tutor role changes in a DLE and how the development of a community of practice can support this change.

Using On-Line Discussion To Develop Preservice Teacher Understanding Of Classroom Management, Brian Ferry, J. Kiggins, G. Hoban

Faculty of Education - Papers (Archive)

This paper describes how a knowledge building community (KBC) of preservice teachers used an on-line discussion forum to develop knowledge about the role of the teacher in modern schools. It traces their initial use of the technology and follows the evolution of its use over a three-year period describing the role of the students and university lecturers in facilitating discussion. The paper then focuses on how members of the KBC used an on-line discussion forum to reflect on and share learning experiences as they developed classroom management strategies.

Quality Assurance And Online Teaching And Learning: First Steps, Robert M. Corderoy, Ray Stace, R. Pennell

Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers

In the late 90s the University of Wollongong (Australia) recognised the need for the establishment of flexible course delivery. The increasing globalisation of the world of tertiary education has added to the pressure for all institutions to address issues associated with the delivery of a quality education. Many systems have been developed internationally, but to be truly useful in changing the process and ensuring the students (the clients) are happy, quality assurance has to have a local component. To address the issue of QA and online teaching and learning the authors are looking at a two phase process, the first …

Dilemmas Of Defending Dissent: The Dismissal Of Ted Steele From The University Of Wollongong, Brian Martin

Faculty of Arts - Papers (Archive)

The summary dismissal of Ted Steele from the University of Wollongong in February 2001 was the most significant case of its type in Australian higher education in half a century. The Steele dismissal case is placed in the context of academic freedom in Australia, the development of the University of Wollongong and Steele's own background. The moves made by key players in the drama - the university administration, the National Tertiary Education Union, the Department of Biological Sciences and Steele - are assessed in the light of possible alternatives. The case shows that rhetoric about free speech and academic freedom …

A Conceptual Model For Capacity Building In Australian Primary Health Care Research, Elizabeth Farmer, Kathryn M. Weston

Graduate School of Medicine - Papers (Archive)

Background: Many general practitioners and primary health care practitioners lack research and evaluation skills. In response, the Australian Government has funded important capacity building initiatives.

Aim: To propose a conceptual model to assist these initiatives.

Model: Four groups of research involvement are suggested: nonparticipants; participating (as part of a research team); managing/training (either leading research, or in formal training to do so); and academic (with, or leading toward, a doctorate). We outline six guiding principles for research capacity building: 1) a whole system approach, 2) accommodating diversity, 3) reducing barriers to participation, 4) enabling collaboration, 5) mentoring, and 6) networking. …

Routing In Mobile Ad Hoc Networks With Global Knowledge, D. Platt

Faculty of Informatics - Papers (Archive)

This paper describes a method of routing in mobile ad hoc networks. The problem is exacerbated by the fact that the radio links between the nodes of the network are continually being made and broken. The method consists of using the known connections to construct a "map" of the network which is intended to reproduce the geographical layout of the network at any time. An algorithm is described which finds a route from one node to another by always attempting to move geographically closer to the destination at every hop. This produces nearly optimal performance with very short computation time. …

Improved Utilisation In Ip Networks Using Multiple Path Routing, D. Platt

Faculty of Informatics - Papers (Archive)

This paper considers routing in an IP network running a routing protocol such as OSPF It takes as a benchmark a routing scheme. which computes a single lowest cost path between every source/destination pair. It proposes two more schemes which each generate two routes for each source/destination pair. The second scheme uses the present lowest cost route and the previous lowest cost route, different from the present one. The third scheme uses the present lowest cost route and re-computes a route by removing all the links used in the first route and using the Dijkstra algorithm. A number of tests …

Scalable Routing Strategy For Dynamic Zones-Based Manets, Mehran Abolhasan, Tadeusz A. Wysocki, E. Dutkiewicz

Faculty of Informatics - Papers (Archive)

This paper presents a new routing strategy for mobile ad hoc networks, called dynamic zone-based topology routing protocol (DZTR). We introduce new strategies to maintain up-to-date intrazone and interzone topology information at each node. We also propose a GPS-based location tracking mechanism, which reduces route discovery area and the number of nodes queried to find the required destination. Our routing strategy has been designed to work with a dynamic zone, which contains a set of member nodes. Every node outside a zone is called a single-state node. We perform theoretical performance analysis, which shows that our network topology creation process …

Remote Collaborative Teaching For Computer Science, A. Fuller, Penelope Mcfarlane, K. Lam

Faculty of Informatics - Papers (Archive)

Like many western universities, the University of Wollongong (Australia) is offering degrees to an increasing number of offshore students. Their usual offshore teaching model involves intensive delivery of course material. Disadvantages of this model include the apparent secondary nature of the offshore academic's role and its unsuitability for technical subjects. In this paper, the authors discuss experiments using Internet technologies to overcome those disadvantages.

Enhancing Team Teaching With Webct, Gene Awyzio, Penelope Mcfarlane, A. Fuller

Faculty of Informatics - Papers (Archive)

Team teaching has been shown to benefit both students and faculty and we have previously shown a class management package (WebCT) supports an interdisciplinary team environment. However, what happens when the team constituency changes? This paper explores our experience with this situation as we depend on WebCT to facilitate adapting to such a change, further highlighting that WebCT is an integral member of our team.

Experiences Using Case Studies To Teach Risk, A. Fuller, Khin Than Win, L. Dei

Faculty of Informatics - Papers (Archive)

Most software development projects today are facing increased risks. Despite this risk management planning is virtually nonexistent, as managers have not been trained in risk management. Few current software engineering curricula provide comprehensive coverage of risk, nor any practical experience in risk assessment. In this paper we discuss our experience using case studies to teach risk as part of a final year course in software process management with a view to determining the effectiveness of the particular case studies. This experience will be used as a foundation for implementing the full semester course in 2003.

Asymptotic Solitons For A Higher-Order Modified Korteweg–De Vries Equation, Timothy R. Marchant

Faculty of Informatics - Papers (Archive)

Solitary wave interaction for a higher-order modified Korteweg–de Vries (mKdV) equation is examined. The higher-order mKdV equation can be asymptotically transformed to the mKdV equation, if the higher-order coefficients satisfy a certain algebraic relationship. The transformation is used to derive the higher-order two-soliton solution and it is shown that the interaction is asymptotically elastic. Moreover, the higher-order phase shifts are derived using the asymptotic theory. Numerical simulations of the interaction of two higher-order solitary waves are also performed. Two examples are considered, one satisfies the algebraic relationship derived from the asymptotic theory, and the other does not. For the example …

Traffic Engineering For Mpls-Based Virtual Private Networks, Chuntung Chou

Faculty of Informatics - Papers (Archive)

This paper considers the traffic engineering of MPLS-based virtual private networks (VPNs) with multiple classes of service. We focus on two main issues. Firstly, we point out that the one LSP per ingress-egress pair constraint can be relaxed for the case of MPLS-based VPNs due to the ease in classifying flows on a per-VPN basis. This allows us to use LSP with finer granularity and thus better load balancing. Secondly, we point out that the single objective traffic engineering formulations proposed in literature address only one particular aspect of the traffic engineering problem. We propose a multiobjective traffic engineering problem …

Spanning The 4 Kbps Divide Using Pulse Modeled Residual, J Lukasiak, I. Burnett

Faculty of Informatics - Papers (Archive)

This paper reports a scalable method for coding the LP residual. The scalable method is capable of increasing the accuracy of the reconstructed speech from a parametric representation at low rates to a more accurate waveform matched representation at higher rates. The method entails pitch length segmentation, decomposition into pulsed and noise components and modeling of the pulsed components using a fixed shape pulse model in a closed-loop, analysis by synthesis system.

Scalable Decomposition Of Speech Waveforms, J Lukasiak, I. Burnett

Faculty of Informatics - Papers (Archive)

Decomposition of speech signals into periodic and noise components is widely used in speech coding to facilitate efficient compression. Existing decomposition schemes are too inflexible to model transient changes in the speech signal, require high delay or produce a large parameter set that is not scalable to low rates. This paper proposes a technique that requires only a single frame of speech and produces a scalable decomposition. The latter allows reconstruction accuracy to be varied according to the bit rate available.

The Analysis Of Speech Codecs Using Psychoacoustic Measures, M. Raad, C. H. Ritz, I. Burnett, Alfred Mertins

Faculty of Informatics - Papers (Archive)

This paper analyses two narrowband speech codecs, the 4.8 kbit/s FS1016 coder and the 8 kbit/s G729 coder, using objective psychoacoustic measures. Four measures are used: loudness, sharpness, roughness and tonality. The results show sharpness and roughness as the two major contributing factors to the subjective difference between the two coders.

Extending Waveform Interpolation To Wideband Speech Coding, C. H. Ritz, I. Burnett, Jason Lukasiak

Faculty of Informatics - Papers (Archive)

This paper investigates the extension of waveform interpolation (WI) to wideband speech coding. Included is an analysis of the evolutionary behaviour of wideband speech and the consequences for WI. We highlight problems associated with direct application of the classical WI algorithm applied to wideband speech.

On Full Orthogonal Designs In Order 56, S. Georgiou, C. Koukouvinos, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

We find new full orthogonal designs in order 56 and show that of 1285 possible OD(56; s1, s2, s3, 56—s1—s2-s3) 163 are known, of 261 possible OD(56; s1, s2, 56—s1—s2) 179 are known. All possible OD(56; s1, 56 — s1) are known.

Unified Power Quality Index (Upqi) For Continuous Disturbances, V. J. Gosbell, B. Perera, H. M. Herath

Faculty of Informatics - Papers (Archive)

Power quality indices are being developed that attempt to quantify certain aspects of service quality. There has been considerable amount of work on the characterization of individual types of power quality disturbances and corresponding indices. However, there does not exist in the literature a standard approach that allows one to quantify the overall power quality. This paper proposes a unified power quality index (UPQI) as a useful tool for ranking sites as to their overall power quality.

Adaptive Management: What Does It Mean And How Can It Be Used In Fire Management?, R. J. Whelan

Faculty of Science - Papers (Archive)

‘Adaptive Management’ is becoming a frequently heard term but it is a much misunderstood concept. It does not mean that developments can go ahead and be ‘adapted’ if detrimental effects are discovered! Its greatest value is in defining an experimental approach to land management in situations where scientific knowledge is lacking but where immediate actions are required. This is especially important where doing nothing might conceivably be just as undesirable as applying any of the alternative management options. Given the lack of knowledge of fire responses of much of our native biota, adaptive management is clearly a sensible approach to …

Calibrating A 4-Wheel Mobile Robot, Phillip J. Mckerrow, D. Ratner

Faculty of Informatics - Papers (Archive)

When a mobile robot is constructed the odometry must be calibrated. Calibrating a 4-wheel robot requires the accurate measurement of steering angle as well as translation and rotation. Some measurements are made with a tape measure and some with ultrasonic sensors. The measurements are used to determine the parameters of the odometry calibration matrix and the steering kinematic model. A procedure for calibrating a 4-wheel robot is discussed.