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University of Wollongong

2005

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Magnetopolaron Interactions In N-Type Indium Phosphide, R. A. Lewis, P. E. Simmonds, Y. J. Wang Dec 2005

Magnetopolaron Interactions In N-Type Indium Phosphide, R. A. Lewis, P. E. Simmonds, Y. J. Wang

Faculty of Engineering - Papers (Archive)

Broadband far-infrared absorption spectroscopy is used to investigate n-type indium phosphide in magnetic fields of up to 30 T. The large energy range 2–14 Ry and the large magnetic field range 03 employed permit the observation of a rich variety of magnetopolaron interactions. We report on the magnetopolaron effect for bound states in InP, beginning with the coupling of the 2p+ state with the 1s+LO phonon state. We further observe the magnetopolaron effect associated with the metastable state 210. In addition we report i) the re-emergence of the 210 impurity state transition beyond the LO phonon manifold, ii) the possible …

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Measurements Of Trace Gas Emissions From Australian Forest Fires And Correlations With Coincident Measurements Of Aerosol Optical Depth, Clare Paton-Walsh, N. B. Jones, Stephen R. Wilson, V Haverd, A. Meier, D. W. Griffith Dec 2005

Measurements Of Trace Gas Emissions From Australian Forest Fires And Correlations With Coincident Measurements Of Aerosol Optical Depth, Clare Paton-Walsh, N. B. Jones, Stephen R. Wilson, V Haverd, A. Meier, D. W. Griffith

Faculty of Science - Papers (Archive)

We present vertically integrated measurements of C2H2, C2H4, C2H6, HCOOH, CO, H2CO, HCN and NH3 through smoke plumes from Australian forest fires measured by ground-based solar absorption spectroscopy. The column amounts of these gases are highly correlated with simultaneous, co-located measurements of aerosol optical depth, providing a potential method of mapping biomass-burning emissions using satellite measurements of aerosol optical depth. We have calculated emission ratios relative to CO for the trace gases using aerosol optical depth as a proxy for CO and converted to emission factors by using an average emission factor for CO from literature measurements of extra-tropical forest …

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Reflections Of Active Galactic Nucleus Outbursts In The Gaseous Atmosphere Of M87, W. Forman, P. Nulsen, S. Heinz, F. Owen, J. Eilek, A. Vikhlinin, M. Markevitch, R. Kraft, E. Churazov, C. Jones Dec 2005

Reflections Of Active Galactic Nucleus Outbursts In The Gaseous Atmosphere Of M87, W. Forman, P. Nulsen, S. Heinz, F. Owen, J. Eilek, A. Vikhlinin, M. Markevitch, R. Kraft, E. Churazov, C. Jones

Faculty of Engineering - Papers (Archive)

We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of active galactic nucleus (AGN) outbursts on its gaseous atmosphere. Many X-ray features appear to be a direct result of repetitive AGN outbursts. In particular, the X-ray cavities around the jet and counterjet are likely due to the expansion of radio plasma, while rings of enhanced emission at 14 and 17 kpc are probably shock fronts associated with outbursts that began 1–2 × 107 yr ago. The effects of these shocks are also seen in brightenings within the prominent X-ray arms. On larger scales, ∼50 …

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Strong Terahertz Emission From (100) P-Type Inas, Rajind Mendis, M. L. Smith, L. J. Bignell, R. Vickers, R. A. Lewis Dec 2005

Strong Terahertz Emission From (100) P-Type Inas, Rajind Mendis, M. L. Smith, L. J. Bignell, R. Vickers, R. A. Lewis

Faculty of Engineering - Papers (Archive)

Terahertz emission has been observed from (100) Zn-acceptor-doped InAs under illumination by fs pulses of near-infrared radiation. Turning the crystal about the surface normal produces two maxima per rotation, whether the angle of incidence is 45° or 75°, in contrast to (111) p-InAs, where three maxima per rotation have been reported. The emitted terahertz power has a quadratic variation with the pump power and decreases with increasing temperature in the range 20–300 K. This behavior is consistent with a photocurrent surge being the dominant terahertz generating mechanism at low excitation fluences. The p-type InAs generates about two orders of magnitude …

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Monitoring Structural Degradation Of Rail Pads In Laboratory Using Impact Excitation Technique, S. Kaewunruen, Alexander Remennikov Dec 2005

Monitoring Structural Degradation Of Rail Pads In Laboratory Using Impact Excitation Technique, S. Kaewunruen, Alexander Remennikov

Faculty of Engineering - Papers (Archive)

In ballasted railway track, the deterioration of a sleeper and ballast support usually occurs due to both regular and irregular wheel/rail interactions. The repeated impact of train wheels over sleepers can reduce the lifetime of a sleeper and degrade ballast. To attenuate the effect of the impact loads on concrete sleepers, the resilient rail seat pads are used. After a certain time in service conditions, the worn rail pads have to be replaced. Assessment of the condition of rail pads is of great importance to track engineers and plays an important role in the overall track maintenance cost. A non-destructive …

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Simple Implementations Of Mutually Orthogonal Complementary Sets Of Sequences, Xiaojing Huang Dec 2005

Simple Implementations Of Mutually Orthogonal Complementary Sets Of Sequences, Xiaojing Huang

Faculty of Informatics - Papers (Archive)

This paper presents simple software and hardware implementations for a class of mutually orthogonal complementary sets of sequences based on its closed-form construction formula. Following a brief review of the Golay-paired Hadamard matrix concept, the flow graph for constructing mutually orthogonal Golay-paired Hadamard matrices, which represent the scalable complete complementary sets of sequences, is proposed. Then, their superb scalability and completeness are summarized. Finally, the C and Matlab functions and a logic schematic diagram are given to easily generate these complementary sequences.

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A Fast Neural-Based Eye Detection System, Fok Hing Chi Tivive, Abdesselam Bouzerdoum Dec 2005

A Fast Neural-Based Eye Detection System, Fok Hing Chi Tivive, Abdesselam Bouzerdoum

Faculty of Informatics - Papers (Archive)

This paper presents a fast eye detection system which is based on an artificial neural network known as the shunting inhibitory convolutional neural network, or SICoNNet for short. With its two-dimensional network architecture and the use of convolution operators, the eye detection system processes an entire input image and generates the location map of the detected eyes at the output. The network consists of 479 trainable parameters which are adapted by a modified Levenberg-Marquardt training algorithm in conjunction with a bootstrap procedure. Tested on 180 real images, with 186 faces, the accuracy of the eye detector reaches 96.8% with only …

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Fringe Pattern Profilometry Based On Inverse Function Analysis, Y. Hu, Jiangtao Xi, Enbang Li, Joe F. Chicharo, Zongkai Yang Dec 2005

Fringe Pattern Profilometry Based On Inverse Function Analysis, Y. Hu, Jiangtao Xi, Enbang Li, Joe F. Chicharo, Zongkai Yang

Faculty of Informatics - Papers (Archive)

In this paper, we proposed a new algorithm, referred to as inverse function analysis (IFA) method based on the derived mathematical model to reconstruct 3-D surfaces using fringe pattern profilometry (FPP) technique. Compared with traditional methods, our algorithm has neither the requirement for the structure of projected fringe patterns, nor the prior knowledge of the characteristics of projection systems. The correctness of inverse function analysis (IFA) method has been confirmed by simulation results. It can be seen that the measurement accuracy has been significantly improved by inverse function analysis (IFA) method, especially when the expected sinusoidal fringe patterns are distorted …

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Tsunami Affected Coastal Soil Disturbance And Implications On Reconstruction With Special Reference To Low-Cost Dwellings And Rail Tracks, Buddhima Indraratna, Mohamed A. Shahin, Cholachat Rujikiatkamjorn, Hadi Khabbaz Dec 2005

Tsunami Affected Coastal Soil Disturbance And Implications On Reconstruction With Special Reference To Low-Cost Dwellings And Rail Tracks, Buddhima Indraratna, Mohamed A. Shahin, Cholachat Rujikiatkamjorn, Hadi Khabbaz

Faculty of Engineering - Papers (Archive)

On 26 December 2004, the largest earthquake for more than 4 decades (magnitude 9.0) occurred between the Australian and Eurasian plates in the Indian Ocean (along the overly stressed Sunda trench) to the west of Aceh Province (Northern Sumatra). The quake triggered a series of waves that increased in height rapidly close to the shore (tsunami) spreading thousands of kilometers across the Bay of Bengal. In the Eastern and Southern coastal belt of Sri Lanka, the floodwaters reached almost 1 km inland, causing unprecedented damage to infrastructure and over 4000 fatalities. Widespread destruction included several kilometres of rail tracks, dislocating …

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A Vision System For Providing The Blind With 3d Colour Perception Of The Environment, S. Meers, Koren Ward Dec 2005

A Vision System For Providing The Blind With 3d Colour Perception Of The Environment, S. Meers, Koren Ward

Faculty of Informatics - Papers (Archive)

Although various attempts have been made at providing the blind with substitute visual perception, no existing method provides useful colour perception of the environment. This paper describes a substitute vision system which provides perception of the three-dimensional profile and colour of the surrounding environment via haptic sensations alone. This is aimed at allowing visually-impaired people to avoid obstacles and navigate the environment by recognising landmarks by their colour and profile. The prototype system uses stereo video cameras to capture colour images of the environment from which a disparity depth map can be calculated. The depth map is sampled into ten …

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High-Capacity Steganography Using A Shared Colour Palette, G. Brisbane, R. Safavi-Naini, P. Ogunbona Dec 2005

High-Capacity Steganography Using A Shared Colour Palette, G. Brisbane, R. Safavi-Naini, P. Ogunbona

Faculty of Informatics - Papers (Archive)

Seppanen, Makela and Keskinarkaus (SMK) have proposed a high-capacity steganographic technique to conceal information within a colour image. The technique is significant because of the high volume of data that is embedded into pixels but it results in a high level of noise and so the quality of the resulting image is not acceptable. A new type of coding structure is proposed, which maintains a high capacity but lowers the level of noise. Secondly, an adaptive algorithm is used to identify pixel values that have a high capacity to distortion ratio. Also the maximum size of the coding structures is …

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Access Policy Sheet For Access Control In Fine-Grained Xml, Jing Wu, Yi Mu, Jennifer Seberry, Chun Ruan Dec 2005

Access Policy Sheet For Access Control In Fine-Grained Xml, Jing Wu, Yi Mu, Jennifer Seberry, Chun Ruan

Faculty of Informatics - Papers (Archive)

We propose an access control scheme for developing authorization rules for XML documents, allowing flexible data granularity and authorization propagation. To simplify the complex access control policies in XML, we introduce a new tool: Authorization Policy Sheet (APS). Complex access control rules can be easily described in an APS. The administrator of a system can easily manage the access control of the system. With aid of Data Type Definitions(DTD), the policies given in an APS can be converted into a standard XML code that can be implemented in a normal XML environment.

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Living With Trees – Perspectives From The Suburbs, Lesley M. Head, Pat Muir Dec 2005

Living With Trees – Perspectives From The Suburbs, Lesley M. Head, Pat Muir

Faculty of Science - Papers (Archive)

A study of suburban backyards and backyarders in Sydney and Wollongong revealed evidence of attitudes and behaviours in relation to trees. Attitudes are characterised under themes that indicate conditions of tolerance and belonging. They include attachment/risk, order/freedom and nativeness/alienness. While love is common, high levels of suspicion and intolerance towards trees in the suburban context are more common. Our findings confirm and throw further light on previous work indicating that many Australians have very partitioned views of the world in relationto where humans and nonhuman lifeforms belong. This partitioning must be understood in conceptual as well as spatial terms.

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Service Discovery In Wireless Ad-Hoc Control Networks, Shengrong Bu, F. Naghdy Dec 2005

Service Discovery In Wireless Ad-Hoc Control Networks, Shengrong Bu, F. Naghdy

Faculty of Informatics - Papers (Archive)

A new concept in distributed control systems called Wireless Ad-hoc Control Networks (WACNets) is developed. WACNets is formed by a collection of nodes with the ability to sense, actuate and control. The network does not have a fixed structure, but evolves and self organises itself according to the control requirements of the system. The service discovery developed for WACNets is reported. A review of the existing Service Discovery Protocol (SDPs) including Jini, Salutation, Universal Plug and Play (UPnP), and Bluetooth technology is carried out. An overview of WACNets is provided. The service discovery protocol developed for WACNets is introduced and …

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Tourism Discretionary Spending Choice Behaviour, G. Crouch, Sara Dolnicar, T. Devinney, T. Huybers, J. Louviere, H. Oppewal Dec 2005

Tourism Discretionary Spending Choice Behaviour, G. Crouch, Sara Dolnicar, T. Devinney, T. Huybers, J. Louviere, H. Oppewal

Faculty of Commerce - Papers (Archive)

Studies of tourism demand are numerous. But studies of how consumers apportion discretionary resources to tourism and across other competing categories of discretionary expenditure are non-existent. Therefore, how individuals and households make trade-offs between, or assess the respective utilities of, the various categories of discretionary expenditure and allocate discretionary financial resources, appears to be unknown. This study seeks to address this need by examining discretionary expenditure through choice experiments. The data provide insights into how each type of discretionary expenditure is valued and how each type competes for a share of the discretionary expenditure ‘pie’. We discuss the results with …

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A Conceptual Model Of The Antecedents Of Behavioural Loyalty Of Dissatisfied Business Services Customers, Venkata Yanamandram, Lesley White Dec 2005

A Conceptual Model Of The Antecedents Of Behavioural Loyalty Of Dissatisfied Business Services Customers, Venkata Yanamandram, Lesley White

Faculty of Commerce - Papers (Archive)

This paper presents a conceptualisation of the factors that lead dissatisfied business-to-business (B2B) customers to stay with their existing service providers. While studies in a B2B context have addressed some important barriers to switching, they have not discussed all of these, and not necessarily under conditions of dissatisfaction. A literature review of previous research, both theoretical and empirical, identified that a gap in the body of knowledge exists regarding the reason that dissatisfied customers are behaviourally loyal, and results from a previous qualitative study unearthed additional barriers that exist. Hence, this paper proposes a model of the deterrents to switching …

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Global Landscapes: A Speculative Assessment Of Emerging Organizational Structures Within The International Wine Industry, D. K. Aylward Dec 2005

Global Landscapes: A Speculative Assessment Of Emerging Organizational Structures Within The International Wine Industry, D. K. Aylward

Faculty of Commerce - Papers (Archive)

As a rapidly evolving sector the international wine industry represents an interesting subject for analysis. Over the past two centuries the industry has experienced a number of major innovations and direction changes. The organizational shifts involved in these changes have been profound. From a monopolization of wine culture through the 19th and much of the 20th century by Europeans, to the emergence of New World operators and their democratic influence, the international wine industry now stands at the edge of another major paradigm shift. This paper traces the industry’s historical changes and speculates on the implications of such issues as …

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Seismic Lateral Response Of Piles In Liquefying Soil, D. S. Liyanapathirana, H. G. Poulos Dec 2005

Seismic Lateral Response Of Piles In Liquefying Soil, D. S. Liyanapathirana, H. G. Poulos

Faculty of Engineering - Papers (Archive)

Soil liquefaction is one of the major factors affecting the behavior of piles founded in seismically active areas. Although methods are available for seismic analysis of pile foundations, in many of them, the supporting soil is assumed to be an elastic material. Here a numerical model is presented which takes into account the reduction of soil stiffness and strength due to pore pressure generation and subsequent soil liquefaction, in addition to the material nonlinearity. Results obtained from the new method are compared with centrifuge test data and show excellent agreement with the observed pile behavior during these tests. To investigate …

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A Digital Pixel Sensor Array With Programmable Dynamic Range, A. Kitchen, A. Bermak, Abdesselam Bouzerdoum Dec 2005

A Digital Pixel Sensor Array With Programmable Dynamic Range, A. Kitchen, A. Bermak, Abdesselam Bouzerdoum

Faculty of Informatics - Papers (Archive)

This paper presents a digital pixel sensor (DPS) array employing a time domain analogue-to-digital conversion (ADC) technique featuring adaptive dynamic range and programmable pixel response. The digital pixel comprises a photodiode, a voltage comparator, and an 8-bit static memory. The conversion characteristics of the ADC are determined by an array-based digital control circuit, which linearizes the pixel response, and sets the conversion range. The ADC response is adapted to different lighting conditions by setting a single clock frequency. Dynamic range compression was also experimentally demonstrated. This clearly shows the potential of the proposed technique in overcoming the limited dynamic range …

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Some New Results Of Regular Hadamard Matrices And Sbibd Ii, Tianbing Xia, M. Xia, Jennifer Seberry Dec 2005

Some New Results Of Regular Hadamard Matrices And Sbibd Ii, Tianbing Xia, M. Xia, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

In this paper we prove that there exist 4—{k2; 1/2k(k—1); k(k—2)} SDS, regular Hadamard matrices of order 4k2, and SBIBD(4k2, 2k2 + k, k2 + k) for k = 47, 71, 151, 167, 199, 263, 359, 439, 599, 631, 727, 919, 5q1, 5q2N, 7q3, where ql, q2 and q3 are prime power such that ql ≡ 1(mod 4), q2 ≡ 5(mod 8) and q3 ≡ 3(mod 8), N = 2a3bt2, a, b = 0 or 1, t ≠ 0 is an arbitrary integer. We find new SBIBD(4k2, 2k2 + k, k2 + k) for 43 values of k less than …

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Fighting For Volunteers’ Time: Competition In The International Volunteering Industry, Sara Dolnicar, Melanie J. Randle Dec 2005

Fighting For Volunteers’ Time: Competition In The International Volunteering Industry, Sara Dolnicar, Melanie J. Randle

Faculty of Commerce - Papers (Archive)

Despite increased competitive pressures in the volunteering industry, the structure of competition within this non-profit sector has not been examined in the past. This study uses selected respondents from the 1999-2002 World Values Survey who have previously volunteered for multiple organisations. Based on the patterns of organisations that volunteers donated their time for, competition between volunteering organisations with different missions was analysed, resulting in five dimensions of volunteering missions within which volunteering organisations appear to be competing: altruistic, leisure, political, church, and other missions. The altruistic mission groups is the broadest and includes a wide variety of volunteering goals, whereas …

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Mimetic Marketing In Environmental Volunteering Organisations, Sara Dolnicar, H. J. Irvine, K. Lazarevski, Melanie J. Randle Dec 2005

Mimetic Marketing In Environmental Volunteering Organisations, Sara Dolnicar, H. J. Irvine, K. Lazarevski, Melanie J. Randle

Faculty of Commerce - Papers (Archive)

The last decade has seen increased competition amongst voluntary organisations. This has resulted in a number of changes to the nonprofit sector, such as increased levels of scrutiny and accountability. Voluntary organisations compete not only for limited numbers of volunteers but also for limited grant funding made available at local, state and federal government levels. Increased competition has placed pressure on organisations to take a more commercial approach to the management of their organisations and to adopt what have been previously considered ‘for profit’ business practices such as marketing. This empirical study uses neo-institutional theory to investigate the marketing of …

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Accountability In The Tsunami Aftermath, A. Abraham Dec 2005

Accountability In The Tsunami Aftermath, A. Abraham

Faculty of Commerce - Papers (Archive)

The devastating series of tsunamis on Boxing Day last year resulted in a flood of requests for help and Australian aid agencies launched appeals seeking cash donations to enable them to locally source food, medicine and shelter. Lists of agencies began appearing and potential donors had to decide through which agencies they should give.

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Unbounded Rationality: The Role Of Connectedness In Right Decision-Making, Mario Fernando, Scott Burrows Dec 2005

Unbounded Rationality: The Role Of Connectedness In Right Decision-Making, Mario Fernando, Scott Burrows

Faculty of Commerce - Papers (Archive)

This paper reports the preliminary findings of a study examining the role of connection in right decision-making of managers operating in Australia. The key aims of the study are to identify the influence of connectedness in the ethical outcomes of right decision-making, to identify barriers to right decision-making and lastly, to examine the nature of any relationship/s between connectedness and unbounded rationality in right decision-making. The study compares and contrasts eight case studies of middle and senior managers drawn from information technology, service and manufacturing sectors. The primary data for the study are in-depth interviews. The findings suggest that connection …

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Scientists, Career Choices And Organisational Change: Managing Human Resources In Cross-Sector R&D Organisations, T. Turpin, Samuel Garrett-Jones, Kieren Diment Dec 2005

Scientists, Career Choices And Organisational Change: Managing Human Resources In Cross-Sector R&D Organisations, T. Turpin, Samuel Garrett-Jones, Kieren Diment

Faculty of Commerce - Papers (Archive)

The resource-based view of the firm has drawn attention to the role of human resources in building innovative capacity within firms. In 'high technology' firms, scientific capability is a critical factor in achieving international competitiveness. Science, however, is a costly business and many firms are entering into cross-sector R&D partnerships in order to gain access to leading edge scientific capability. The Australian Cooperative Research Centres (CRC) program is typical of the ways many governments are seeking to promote such cross-sector R&D collaboration. Scientists are key resources in these organisational arrangemation available about why and when scientists choose to work in …

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Journalism, National Development And Social Justice In Malaysia, M. K. Anuar Dec 2005

Journalism, National Development And Social Justice In Malaysia, M. K. Anuar

Asia Pacific Media Educator

A factor built into the journalistic fraternity is the hierarchical nature of Malaysian society where there is so much respect and deference given to political leaders by Malaysians, particularly journalists, that they inadvertently abandon the responsibility of asking the hard questions for the benefit of their readers. This explains why veteran journalists were ‘takut-takut’ (‘afraid’ in the Malay language) to ask questions when they faced the former Prime Minister Mahathir Mohamed. It is therefore not an exaggeration to suggest that at times media conferences organized by the former prime minister and other cabinet ministers were often transformed into a ministerial …

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Investigating The Hypothetical: Building Journalism Skills Via Online Challenges, S. Tanner Dec 2005

Investigating The Hypothetical: Building Journalism Skills Via Online Challenges, S. Tanner

Asia Pacific Media Educator

Journalism academics are constantly looking for ways to improve their teaching practices. Foremost is the need to ensure students are equipped with the skills to help them shift seamlessly from classroom to newsroom. These skills are relatively easy to identify – for instance, produce and research story ideas, interrogate complex research material, and then present it in a way that can be understood by an identified audience. This paper focuses on an experimental online hypothetical news scenario in helping students develop these required skills to identify and research complex stories - often described as ‘investigative pieces’ - irrespective of the …

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Editorial: In This Issue, Eric Loo Dec 2005

Editorial: In This Issue, Eric Loo

Asia Pacific Media Educator

This 16th issue of APME eschews any claim on the superiority of each value system over another. The refereed papers and commentaries are generally premised on the notion that journalism’s textual production process is understandably influenced by the practitioners’ cultural and professional value system. Without making any explicitly absolutist claim, the authors attempt to show that answers to value-laden questions are equally multicoloured. To date, systematic studies scarcely address the nexus between ethno-cultural value systems and media professional practice. I hope readers of APME would consider the papers and commentaries in this issue as a conversation starter in both the …

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Journalism Values In The Philippine Media, C. F. Hofileña Dec 2005

Journalism Values In The Philippine Media, C. F. Hofileña

Asia Pacific Media Educator

The Philippine media thrive on conflict. Headlines of national broadsheets stoke the flames of cynicism, resentment and anger toward the Arroyo administration which has been judged by “militant” media to have lost credibility and legitimacy to rule. At the same time, opposition leaders who are no more credible than administration officials are equally criticized if not on the front pages, in the opinion pages. The possible consequences of carrying stories that could undermine investor confidence or encourage political destabilization efforts are among the least of concerns of the local media.

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East Meets West: Refocusing Communication And Journalism Education, J. Herbert Dec 2005

East Meets West: Refocusing Communication And Journalism Education, J. Herbert

Asia Pacific Media Educator

Writing, reporting, interviewing and editing remain the pillars of any journalism programme. The problem is what journalism educators put around these pillars, how they are made internationally relevant and given an intellectual foundation. The difficulty with journalism today is that it’s at the bottom of the pile in terms of what readers and viewers think of its trustworthiness. Something has to be done to redeem its credibility and social responsibility. John Herbert refers to a new book The Dao of the Press (Gunaratne, Shelton, 2005) in proposing an approach to journalism education that may reclaim the profession’s credibility.

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