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Social and Behavioral Sciences Commons™

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Science and Technology Studies

University of Wollongong

2004

Articles 31 - 39 of 39

Full-Text Articles in Social and Behavioral Sciences

Estimation Of Diffusion Coefficients, Lateral Shear Stress, And Velocity In Open Channels With Complex Geometry, Shu-Qing Yang, Jian-Xing Yu, Yuan-Zhan Wang Jan 2004

Estimation Of Diffusion Coefficients, Lateral Shear Stress, And Velocity In Open Channels With Complex Geometry, Shu-Qing Yang, Jian-Xing Yu, Yuan-Zhan Wang

Faculty of Engineering and Information Sciences - Papers: Part A

The lateral distributions of depth-averaged apparent shear stress, depth mean velocity, and diffusion coefficients are essential in certain quantitative analysis for sediment transport and environmental studies. An analytical method for the computation of these parameters is presented. A mathematical relationship between these parameters, based on the concept of surplus energy transport through a minimum relative distance developed by Yang and Lim [1997], is established, the depth-averaged apparent shear stress is determined from the boundary shear stress, depth mean velocity is obtained by considering the influence of nonuniform shear velocity and the free surface in 3-D channels, and the diffusion coefficients …

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Code Compression Based On Operand-Factorization For Vliw Processors, Montserrat Ros, Peter Sutton Jan 2004

Code Compression Based On Operand-Factorization For Vliw Processors, Montserrat Ros, Peter Sutton

Faculty of Engineering and Information Sciences - Papers: Part A

Code compression techniques have been devised as a way of battling large code. Code compression algorithms usually require specific techniques to maintain the integrity of the program and ensure its functionality. RISC processors have been the main focus for code compression techniques but VLIW (Very Long Instruction Word) processors are now being considered in this area.

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A Hamming Distance Based Vliw/Epic Code Compression Technique, Montserrat Ros, Peter Sutton Jan 2004

A Hamming Distance Based Vliw/Epic Code Compression Technique, Montserrat Ros, Peter Sutton

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents and reports on a VLIW code compression technique based on vector Hamming distances [19]. It investigates the appropriate selection of dictionary vectors such that all program vectors are at most a specified maximum Hamming distance from a dictionary vector. Bit toggling information is used to restore the original vector. A dictionary vector selection method which considered both vector frequency as well as maximum coverage achieved better results than just considering vector frequency or vector coverage independently. This method was found to outperform standard dictionary compression on TI TMS320C6x program code by an average of 8%, giving compression …

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Reliability Of Higher Seeding Rates Of Wheat For Increased Competitiveness With Weeds In Low Rainfall Environments, D Lemerle, R D. Cousens, G S. Gill, S J. Peltzer, M Moerkerk, C E. Murphy, D Collins, Brian R. Cullis Jan 2004

Reliability Of Higher Seeding Rates Of Wheat For Increased Competitiveness With Weeds In Low Rainfall Environments, D Lemerle, R D. Cousens, G S. Gill, S J. Peltzer, M Moerkerk, C E. Murphy, D Collins, Brian R. Cullis

Faculty of Engineering and Information Sciences - Papers: Part A

Increasing crop competitiveness using higher seeding rates is a possible technique for weed management in low input and organic farming systems or when herbicide resistance develops in weeds. A range of wheat seeding rates were sown and resulted in crop densities between 50–400 plants/m2 (current recommendations are 100–150 plants/m2) in the presence and absence of annual ryegrass (Lolium rigidum Gaud.) in three wheat cultivars at nine experiments in southern Australia. Wheat densities of at least 200 plants/m2 were required to suppress L. rigidum and to a lesser extent increase crop yield across a wide range …

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Improving Adaboost For Classification On Small Training Sample Sets With Active Learning, Lei Wang, Xuchun Li, Eric Sung Jan 2004

Improving Adaboost For Classification On Small Training Sample Sets With Active Learning, Lei Wang, Xuchun Li, Eric Sung

Faculty of Engineering and Information Sciences - Papers: Part A

Recently, AdaBoost has been widely used in many computer vision applications and has shown promising results. However, it is also observed that its classification performance is often poor when the size of the training sample set is small. In certain situations, there may be many unlabelled samples available and labelling them is costly and time-consuming. Thus it is desirable to pick a few good samples to be labelled. The key is how. In this paper, we integrate active learning with AdaBoost to attack this problem. The principle idea is to select the next unlabelled sample base on it being at …

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Synchrotron Radiation Based Experimental Determination Of The Optimal Energy For Cell Radiotoxicity Enhancement Following Photoelectric Effect On Stable Iodinated Compounds, S Corde, A Joubert, J F. Adam, A M. Charvet, J F. Le Bas, F Esteve, H Elleaume, J Balosso Jan 2004

Synchrotron Radiation Based Experimental Determination Of The Optimal Energy For Cell Radiotoxicity Enhancement Following Photoelectric Effect On Stable Iodinated Compounds, S Corde, A Joubert, J F. Adam, A M. Charvet, J F. Le Bas, F Esteve, H Elleaume, J Balosso

Faculty of Engineering and Information Sciences - Papers: Part A

This study was designed to experimentally evaluate the optimal X-ray energy for increasing the radiation energy absorbed in tumours loaded with iodinated compounds, using the photoelectric effect. SQ20B human cells were irradiated with synchrotron monochromatic beam tuned at 32.8, 33.5, 50 and 70 keV. Two cell treatments were compared to the control: cells suspended in 10 mg ml1 of iodine radiological contrast agent or cells pre-exposed with 10 mM of iodo-desoxyuridine (IUdR) for 48 h. Our radiobiological end point was clonogenic cell survival. Cells irradiated with both iodine compounds exhibited a radiation sensitisation enhancement. Moreover, it was energy dependent, with …

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Design-Side Considerations: A Reaction To Duem, Robert B. K. Brown Jan 2004

Design-Side Considerations: A Reaction To Duem, Robert B. K. Brown

Faculty of Engineering and Information Sciences - Papers: Part A

Evaluation of a system's usability is a difficult task, but a new method, DUEM, addresses several of the issues. Any evaluation conducted after the fact however has limited effect, so further work is required at the design end of the lifecycle. Early-Phase elicitation tools, such as i*, may form the basis for new design tools which simplify software development, improve usability and ensure greater system success. Informing such design tools with the principles of the latest Activity Theory-based usability evaluation methods, such as DUEM should facilitate easier testing. As an added benefit, such a design method can form the first …

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A Systematic Study Of Radio-Induced X-Ray Cavities In Clusters, Groups, And Galaxies, L Birzan, D A. Rafferty, B R. Mcnamara, M W. Wise, Paul E. J Nulsen Jan 2004

A Systematic Study Of Radio-Induced X-Ray Cavities In Clusters, Groups, And Galaxies, L Birzan, D A. Rafferty, B R. Mcnamara, M W. Wise, Paul E. J Nulsen

Faculty of Engineering and Information Sciences - Papers: Part A

We present an analysis of 16 galaxy clusters, one group, and one galaxy drawn from the Chandra Data Archive. These systems possess prominent X-ray surface brightness depressions associated with cavities or bubbles that were created by interactions between powerful radio sources and the surrounding hot gas. The central galaxies in these systems harbor radio sources with luminosities ranging between ∼2 × 10 38 and 7 × 10 44 ergs s -1. The cavities have an average radius of ∼10 kpc, and they lie at an average projected distance of ∼20 kpc from the central galaxy. The minimum energy associated with …

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A Review Of Routing Protocols For Mobile Ad Hoc Networks, Mehran Abolhasan, Tadeusz Wysocki, Eryk Dutkiewicz Jan 2004

A Review Of Routing Protocols For Mobile Ad Hoc Networks, Mehran Abolhasan, Tadeusz Wysocki, Eryk Dutkiewicz

Faculty of Engineering and Information Sciences - Papers: Part A

The 1990s have seen a rapid growth of research interests in mobile ad hoc networking. The infrastructureless and the dynamic nature of these networks demands new set of networking strategies to be implemented in order to provide efficient end-to-end communication. This, along with the diverse application of these networks in many different scenarios such as battlefield and disaster recovery, have seen MANETs being researched by many different organisations and institutes. MANETs employ the traditional TCP/IP structure to provide end-to-end communication between nodes. However, due to their mobility and the limited resource in wireless networks, each layer in the TCP/IP model …

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