Showing papers by "Swinburne University of Technology published in 1992"
TL;DR: Results are extended to 1446 Australian rules football games and it is shown that both prediction methods perform similarly, based on the fraction of correct selections of the winning team, upon past margins of victory corrected for home advantage.
Abstract: In a previous paper, it was demonstrated that distinctly different prediction methods when applied to 2435 American college and professional football games resulted in essentially the same fraction of correct selections of the winning team and essentially the same average absolute error for predicting the margin of victory. These results are now extended to 1446 Australian rules football games. Two distinctly different prediction methods are applied. A least-squares method provides a set of ratings. The predicted margin of victory in the next contest is less than the rating difference, corrected for home-ground advantage, while a 0.75 power method shrinks the ratings compared with those found by the least-squares technique and then performs predictions based on the rating difference and home-ground advantage. Both methods operate upon past margins of victory corrected for home advantage to obtain the ratings. It is shown that both methods perform similarly, based on the fraction of correct selections of t...
64 citations
TL;DR: It is demonstrated that volume conduction is one of a family of processes capable of generating such patterns with SPCA, and any series of measurements on a sphere in which the covariance is only a function of measurement site angular separation will yield the spherical harmonics.
Abstract: Spatial principal components analysis (SPCA) applied to the ongoing EEG yields factor loadings which, when mapped, consistently reveal symmetrical patterns resembling the spherical harmonics. In this paper, we consider the mechanisms responsible for these characteristic patterns. In doing so, we demonstrate that volume conduction is one of a family of processes capable of generating such patterns with SPCA. It is shown that any series of measurements on a sphere in which the covariance is only a function of measurement site angular separation (shift invariant processes) will yield the spherical harmonics as the eigenvectors or factor loadings of the covariance matrix. Simulations further indicate that this effect is robust and not determined by the geometry of the measurement sites. In situations where shift invariant signals coexist with those generated at specific sites (anatomically specific processes), such as evoked potentials and some artifacts, it is shown that the anatomically specific signals do not influence the eigenvectors of the covariance matrix in a uniform or random fashion. The factors most influenced are those whose symmetry is similar to that of the site specific signal.
34 citations
TL;DR: Investigation of personality disorders of 21 recent-onset Bipolar Disorder patients using the revised Million Clinical Multiaxial Inventory found Narcissistic, Antisocial, and Histrionic personality disorders were diagnosed most frequently and were the scales most elevated.
Abstract: This study investigated the personality disorders of 21 recent-onset Bipolar Disorder patients using the revised Million Clinical Multiaxial Inventory (MCMI-II; Millon, 1987). Personality disorder assessments, conducted after patients' clinical symptoms had settled, indicated that 17 patients received at least one MCMI-II personality disorder diagnosis with a trend toward multiple diagnoses. Narcissistic, Antisocial, and Histrionic personality disorders were diagnosed most frequently and were the scales most elevated. Schizoid and Compulsive personality disorders were the scales least elevated. Diagnostic concordance between the MCMI-II and the Structured Interview for DSM-III Personality (SIDP; Pfohl, Stangl, & Zimmerman, 1983) was poor; the MCMI-II made more multiple diagnoses. Implications of the discrepancies between these instruments and suggestions for future research are discussed.
32 citations
TL;DR: In this paper, depression levels of 148 undergraduates were measured at the beginning and the end of an academic year: 16% were depressed initially, 18% were depression at the end, and 73% were not depressed on either occasion.
Abstract: Depression levels of 148 undergraduates were measured at the beginning and the end of an academic year: 16% were depressed initially; 18% were depressed at the end of the year; 73% were not depressed on either occasion; 7% were depressed on both occasions The major predictor of students' end-of-year depression levels was initial depression level Students' scores on an irrational beliefs test and the number of stressful life events experienced were also predictive of end-of-year depression
30 citations
TL;DR: In this article, the removal of contaminants by adsorbing colloid flotation of Cr(III), Ni(II), and Zn(II) from chromium stream electroplating wastewater was investigated.
Abstract: The removal by adsorbing colloid flotation of Cr(III), Ni(II), and Zn(II) from chromium stream electroplating wastewater was investigated. Adsorbing colloid flotation involves the stripping of contaminants by adsorption or coprecipitation onto added colloidal material and its subsequent flotation by column flotation. The added colloid may be prepared prior to the adsorption step or, as in this case, prepared in situ by the hydrolysis of added metal [Fe(III)] ions. Adsorbing colloid flotation using a single surfactant (SDS) in the batch mode was shown to result in poor results for “real” industrial samples, presumably due to the chemical complexity of such samples. However, a dual surfactant system [sodium dodecylsulfate (SDS) + dodecanoic acid (DA)] provided encouraging results. By using such a dual surfactant system, chromium stream electroplating wastewater was treated, successfully lowering metal ion contamination levels to below that required for discharge into typical metropolitan drainage s...
19 citations
TL;DR: An improved method has been developed for the determination of fungal spore counts using a haemocytometer using a personal computer with a frame grabber card and commercial imaging software.
Abstract: An improved method has been developed for the determination of fungal spore counts using a haemocytometer The method uses a personal computer with a frame grabber card and commercial imaging software Semi-automation using an iterative programming technique was implemented to count the spores produced byPhanerochaete chrysosporium Rapid and reliable counts were achieved using image processing
12 citations
TL;DR: In this article, the surface hydrophobicity of Australian coal was assessed by measuring the angle of contact between light gas oil in water with discs pressed from the coal, and the effectiveness of agglomeration was measured by the weighted average size of the aggregates resulting from successful agglomation of a coal.
12 citations
01 Oct 1992
TL;DR: In this paper, the critical properties of binary mixtures are predicted using a theoretical alternative to the conventional mixing rules for the contribution of the attractive equation of state parameter for the mixture.
Abstract: The critical properties of binary mixtures are predicted using a theoretical alternative to the conventional mixing rules for the contribution of the attractive equation of state parameter for the mixture. The method does not require adjustable combining rule parameters and the only experimental input data are the critical properties of the component pure substances. The comparison of calculated critical properties with experimental data yields very good agreement. The discrepancy between theory and experiment is often similar to that obtained by using optimized adjustable combining rule parameters. Consequently, genuinely accurate a priori predictions of critical equilibria are possible for many binary mixtures containing either non-polar or weakly polar components.
12 citations
09 Nov 1992
TL;DR: A method for collision-free path planning for two robot arms operating in a common workspace that assumes that the common workspace is divided into discrete regions that can be regarded as common resources.
Abstract: A method for collision-free path planning for two robot arms operating in a common workspace is presented. This method assumes that the common workspace is divided into discrete regions that can be regarded as common resources. These resources are engaged as the robot arms move along their paths. Robot arms are allocated the master/slave status, with the master arm given priority to complete its tasks. The performance of this method is compared with that of the approach which allows only one robot arm to be present in the common workspace. Although the proposed method has been primarily developed for offline path planning, it can be also, with additional assumptions, used for online path determination. >
12 citations
10 citations
TL;DR: Twenty-six bacteria were examined for the presence of penicillin acylase and beta-lactamase and all beta- lactamases were constitutive enzymes in those organisms where both enzymes co-existed.
Abstract: Twenty-six bacteria were examined for the presence of penicillin acylase and beta-lactamase. A copper reducing assay, which was sensitive in the analytical range 2-20 micrograms/ml, was used for determination of penicilloates and a fluorescamine assay was used to determine 6-aminopenicillanic acid concentrations when both substances were produced by the action of the enzymes on a single substrate. Seventeen bacteria contained beta-lactamases, six contained penicillin acylases and four contained both enzymes. Two bacteria contained a Type 1 penicillin acylase and four bacteria contained a Type II enzyme. No ampicillin acylases were detected. All beta-lactamases were constitutive enzymes in those organisms where both enzymes co-existed. Bacillus subtilis and B. cereus produced inducible and extracellular beta-lactamases. Acinetobacter calcoaceticus ATCC 21288 produced a constitutive beta-lactamase which was detected extracellularly.
10 May 1992
TL;DR: In this paper, the relationship between power control, new call admission control, handoff procedures, and connection quality in CDMA networks is considered, and the authors propose a new measure of service quality to quantify the resulting improvements in teletraffic performance.
Abstract: The teletraffic performance of code division multiple access (CDMA) cellular communication networks, in particular the relationships between power control, new call admission control, handoff procedures, and connection quality, is considered. How the power transmitted for each user's signal must be controlled if channel capacity is to be maximized is addressed. When power levels are suitably controlled, CDMA has a teletraffic behavior which exhibits a gradual overload nature. Operational strategies to exploit this gradual overload characteristic, by allowing operation near and beyond the normal cell capacity so as to better handle traffic overloads, particularly minimizing handover failures, are described. Simulations, using a novel measure of service quality, have quantified the resulting improvements in teletraffic performance. >
TL;DR: In this article, the effect of surface composition was examined by modifying the oxygen-containing functional groups and the exchangeable metal cation contents of low-rank coal, and it was found that a smooth decline in the heat of immersion resulted from a reduction in surface polarity.
TL;DR: Kaolinite filler surfaces were modified by both surface absorption and surface reaction as mentioned in this paper, and their subsequent wetting and adhesion properties were determined by measurement of the contact angle of the powders.
Abstract: Kaolinite filler surfaces were modified by both surface absorption and surface reaction. Their subsequent wetting and adhesion properties were determined by measurement of the contact angle of the powders. Surface modification by adsorption utilized the kaolinite surface acidity to polymerize styrene. Surface reaction involved reaction of kaolinite hydroxyl groups with aryl diisocyanates and subsequent termination with a series of alcohols of increasing complexity. It was shown that kaolinite surface could be modified to produce surfaces of controlled hydrophobicity
TL;DR: A stable high resolution estimator (SHIRE) based on a new weighting function for eigenvectors of an array sensor covariance matrix is proposed for bearing estimation of closely spaced sources.
Abstract: A stable high resolution estimator (SHIRE) based on a new weighting function for eigenvectors of an array sensor covariance matrix is proposed for bearing estimation of closely spaced sources. SHIRE is data adaptive and requires no user-defined parameter in its implementation. Numerical results are presented to illustrate the performance achievable. >
01 Jan 1992
TL;DR: The future of Software Engineering education in Australia in the 1990s from the perspective of the current debate on the of Computer Science and Software Engineering as academic disciplines supports the prevailing view that maintaining the unity of computer science and software Engineering is of critical importance.
Abstract: This paper discusses the future of Software Engineering education in Australia in the 1990s from the perspective of the current debate on the separation of Computer Science and Software Engineering as academic disciplines. It supports the prevailing view that maintaining the unity of Computer Science and Software Engineering is of critical importance.
TL;DR: In this article, a fluorescent method has been developed for determination of ascorbic acid concentrations, which is suitable for analysis of concentrations in the range from 50 μM to 4 mM ascorbinic acid solutions.
Abstract: A fluorescent method has been developed for determination of ascorbic acid concentrations. The method involves treatment of the ascorbic acid with Cu(II) and treating the hydrogen peroxide formed with horseradish peroxidase in the presence ofp-hydroxyphenylacetic acid, to form a fluorescentp-hydroxyphenylacetic acid dimer. The reaction is suitable for analysis of concentrations in the range from 50 μM to 4 mM ascorbic acid solutions and can be used for analysis of pharmaceutical preparations but is unsuitable for analysis of ascorbate in preparations derived from natural sources. By using a slight modification of the analytical technique it is possible to measure the amount of hydrogen peroxide formed and the residual concentrations of ascorbic acid in solutions treated with varying amounts of copper ion.
17 Sep 1992
TL;DR: The authors present the formulation and solution of an optimal bandwidth allocation strategy for virtual paths in the broadband integrated services digital network (ISDN) under nonstationary conditions and seek to optimize time-varying averages rather than steady-state averages.
Abstract: The authors present the formulation and solution of an optimal bandwidth allocation strategy for virtual paths in the broadband integrated services digital network (ISDN) under nonstationary conditions. A state variable modeling approach is adopted to describe the dynamic behavior of the virtual path for different traffic classes. The problem is treated by Hamilton-Jacobi arguments, to formulate an optimal capacity allocation strategy for the equilibrium costate case. This is compared, using simulation, with the general solution of the problem. The present approach to the optimal capacity allocation problem differs from the majority of approaches in the literature on the optimal control of queueing systems which are based on the assumption of steady-state queueing models. The authors deal with the more pragmatic case of nonstationary network behaviour. i.e., they seek to optimize time-varying averages rather than steady-state averages. >
TL;DR: Sadus et al. as discussed by the authors compared the critical temperatures of binary mixtures containing perfluorotributylamine and a hydrocarbon with experimental data and showed that the temperature minimum of these mixtures can be predicted but a positive deviation is not observed.
TL;DR: In this article, the effects of machine reliability and transported speeds on the performance of individual cells in a flexible manufacturing system were investigated in relation to a specific case study environment which incorporates the characteristics of some organizations employing flexible manufacturing technologies.
Abstract: This paper describes an investigation into the effects of machine reliability and transported speeds, factors independent of the product-process relationship, on the performance of individual cells in a flexible manufacturing system. The effects of machine reliability and transporter speeds are investigated in relation to a specific case study environment which incorporates the characteristics of some organizations employing flexible manufacturing technologies.
01 Jan 1992
01 Jan 1992
01 Jan 1992
01 Jan 1992
TL;DR: In this article, an analysis of the electric current carried by positive ions from the flame in a flame ionization detector is extended to include the effect of the diffusion of the ions.
Abstract: An earlier analysis of the electric current carried by positive ions from the flame in a flame ionization detector is extended to include the effect of the diffusion of the ions It had been noted that the earlier theory gave a current-voltage expression from which the experimental measurements diverged at very low values of the voltages Solutions of the nonlinear differential equations for the electric field are presented here in both one and two dimensions, the latter being the experimental cylindrical arrangement of the flame ionization detector A partial explanation is given for the behaviour at low currents
17 Feb 1992
TL;DR: A number of parallel processing schemes are decribed for the computation of the Newton-Euler equations of motion of a manipulator and implemented on multiprocessor systems and a moderate speedup have been achieved on a shared memory system and a good speedup on a dataflow system.
Abstract: A number of parallel processing schemes are decribed for the computation of the Newton-Euler equations of motion of a manipulator and implemented on multiprocessor systems. The results show that a moderate speedup have been achieved on a shared memory system and a good speedup on a dataflow system.
01 Jan 1992
TL;DR: The Higher Education Contribution Scheme (HECS) was introduced in the 1988/89 Commonwealth budget to take effect from 1 January 1989 as discussed by the authors, which was established to help fund the planned expansion of Australia's higher education system.
Abstract: Publisher Summary This chapter elaborated the impact of Australian government policy on higher education on accounting education. The Higher Education Contribution Scheme was announced in the 1988/89 Commonwealth budget to take effect from 1 January 1989. It was established to help fund the planned expansion of Australia's higher education system. Under the scheme, students contribute about 20% of the average cost of a higher education place. Each semester students choose either to pay up front, or to defer payment. The Commonwealth government should adopt a needs-based model for funding of accounting education, not the historical models of the past, and institutions should use the same model for funding accounting education internally. Funds from full fee-paying overseas students should be used to provide resources on a scale that is at least one-third higher than the level of funding per Australian student, and full fee-paying overseas students should meet entrance requirements equivalent to those for Australian students. A target student-staff ratio of 16 to one should be adopted by institutions immediately.
17 Feb 1992
TL;DR: This paper describes the development and validation of a personal computer (PC) based computer-aided design / computer- aided manufacture (CAD/CAM) program which finds the near optimum design of filament winding machines.
Abstract: Filament winding is a fibre placement process used in the manufacture of fibre reinforced plastic (FRP) components. The strength of this process is in its control over fibre orientation during lay up. This control enables near optimum manufacture of composite materials. This paper describes the development and validation of a personal computer (PC) based computer-aided design / computer-aided manufacture (CAD/CAM) program which finds the near optimum design. The software has been written to use the geodesic design technique but is of modular construction so any design technique can be used simply by adding the appropriate module. Once designed, the shell specifications are contained within a text file. This is then used to create three dimensional and colour-shaded images of the shell. It is also used by a post processor which generates the numerical control (NC) codes to drive the winding machine. Introduction designed purely on its intended purpose. The simplest design which will work is to clhoose the shell's shape and then lay the filament on a geodesic path over the surface. This paper describes the development and use of software for programming NC filament winding machines. The shape of the shell is entered and the geodesic path over which the filament should be layed, is found. This path is encoded using a postprocessor making it possible to suit the output to any NC machine capable of winding. Restricting design to shells of axisymmetric shape, sim,plifies analysis and means that the power of a PC is ample to run the software. The Filaiment Winding Process In the filament winding; process, one or more fibres are drawn through a tensioning device and a resin bath before passing through a feed eye, guiding the filament onto a mandrel (figure 1). Most material used in other FBP processes can be used in filament winding, including thermoplastics. Filament winding is a precise fibre placement process and is only justified for high performance applications. Developed and initially used for ma.king cases for solid fuel rocket motors, it is now used for other applications, such as: high pressure, light weight gas tanks, high pressure pipes, drive shafts, spinnaker poles, pneumatic and hydraulic cylinders and many other applications. Filament winding is a fibre placement process used in the manufacture of FRP components. A component is made by winding a continuous fibre onto a mandrel of the required shape. The fibre is wound in a controlled pattern, to totally cover the mandrel, creating a hollow, shell structure. The advantage of filament winding over other placement techniques, such as hand lay-up, is its control over fibre orientation. Placing fibres in the directions of principal stresses maximises the effect of the fibre, stiffening and strengthening the plastic. The high cost of the process limits its use to products where this high degree of optimisation is required. Applications are in aerospace, transport and sporting goods industries. For satisfactory control over fibre placement, NC is used. Up to six axes of motion may be available[l]. In the past, machines have been programmed using approximate techniques such as 'leading through'. More recently, software for off-line programming of winding machines has become common. Such software offers one or more of the following features: 1) Winding kinematics may be considered, ensuring that the particular design is physically possible. Shells may be designed using stress analysis. The shell wall may be analysed, as successive layers are wound with different orientation. '2)
11 Aug 1992