5,652 results for Conference item

  • The NLANR NAI Network Analysis Infrastructure

    McGregor, Anthony James; Braun, Hans-Werner; Brown, Jeff (2000)

    Conference item
    University of Waikato

    The National Laboratory for Applied Network Research is creating a network analysis infrastructure to support network research and engineering of high performance research networks. The NAI includes a passive monitoring project, an active monitoring project, and collection of network management and control data. Together these projects have deployed more than 120 monitors around the high-performance research networks in the United States. This article describes NAI and the projects using it. The article concludes with a discussion of the future plans for the infrastructure.

    View record details
  • Connecting, synchronising, and dating with tephras: principles and applications of tephrochronology in Quaternary research

    Lowe, David J. (2016)

    Conference item
    University of Waikato

    Tephrochronology is a unique method for linking and dating geological, palaeoecological, palaeoclimatic, or archaeological sequences or events. The method relies firstly on stratigraphy and the law of superposition, which apply in any study that connects or correlates deposits from one place to another. Secondly, it relies on characterising and hence identifying or ‘fingerprinting’ tephra layers using either physical properties evident in the field or those obtained from laboratory analysis, including mineralogical examination by optical microscopy or geochemical analysis of glass shards or crystals (e.g., Fe-Ti oxides, ferromagnesian minerals) using the electron microprobe and other tools. Thirdly, the method is enhanced when a numerical age is obtained for a tephra layer by (1) radiometric methods such as radiocarbon, fission-track, U-series, (U-Th)/He, or Ar/Ar dating, (2) incremental dating methods including dendrochronology or varved sediments or layering in ice cores, or (3) age-equivalent methods such as palaeomagnetism or correlation with marine oxygen isotope stages or palynostratigraphy. Once known, that age can be transferred from one site to the next using stratigraphic methods and by matching compositional characteristics, i.e., comparing ‘fingerprints’ from each layer. Used this way, tephrochronology is an age-equivalent dating method.

    View record details
  • Static techniques for reducing memory usage in the C implementation of Whiley programs

    Weng, Min-Hsien; Pfahringer, Bernhard; Utting, Mark (2017)

    Conference item
    University of Waikato

    Languages that use call-by-value semantics, such as Whiley, can make program verification easier. But effcient implementation becomes harder, due to the overhead of copying and garbage collection. This paper describes how a mixture of static analysis and runtime-monitoring can be used to eliminate unnecessary copying and deallocate memory with- out garbage collection. We show that this allows Whiley programs to be translated into effcient C implementations.

    View record details
  • Performance, Validation and Testing with the Network Simulation Cradle

    Jansen, Sam; McGregor, Anthony James (2006)

    Conference item
    University of Waikato

    Much current simulation of TCP makes use of simplified models of TCP, which is a large and complex protocol with many variations possible between implementations. We use direct execution of real world network stacks in the network simulator ns-2 to compare TCP performance between implementations and reproduce existing work. A project called The Network Simulation Cradle provides the real world network stacks and we show how it can be used for performance evaluation and validation. There are large differences in performance between simplified TCP models and TCP implementations in some situations. Such differences are apparent in some reproduced research, with results using the Network Simulation Cradle very different from the results produced with the ns-2 TCP models. In other cases, using the real implementations gives very similar results, validating the original research.

    View record details
  • Using the IEEE 802.11 frame check sequence as a pseudo random number for packet sampling in wireless networks

    Raynel, Scott McKenzie; McGregor, Anthony James; Jorgensen, Murray A. (2009)

    Conference item
    University of Waikato

    Low power devices such as common wireless router platforms are not capable of performing reliable full packet capture due to resource constraints. In order for such devices to be used to perform link-level measurement on IEEE 802.11 networks, a packet sampling technique is required in order to reliably capture a representative sample of frames. The traditional Berkeley packet filter mechanism found in UNIX-like operating systems does not directly support packet sampling as it provides no way of generating pseudo-random numbers and does not allow a filter program to keep state between invocations. This paper explores the use of the IEEE 802.11 frame check sequence as a source of pseudo-random numbers for use when deciding whether to sample a packet. This theory is tested by analysing the distribution of frame check sequences from a large, real world capture. Finally, a BPF program fragment is presented which can be used to efficiently select packets for sampling.

    View record details
  • Can a pre-participation test of movement quality predict injury in sport and exercise? : systematic reviews of reliability and validity of the ‘Functional Movement Screen’

    Moran, Robert; Schneiders, A. G.; Mason, Jesse; Major, K.; Sullivan, S. J. (2017-05-10T05:34:59Z)

    Conference item
    Unitec

    View record details
  • Social Work Education Enhancement Program (SWEEP) : social work field practicum in Vietnam : challenges and recommendations for a better model

    Nguyen, Hoa (2017-05-10T05:34:38Z)

    Conference item
    Unitec

    Research objectives: Describe current field models in Vietnam Challenges in current field models Solutions and directions for social work field education in Vietnam

    View record details
  • Social work education development in Vietnam : a case of Social Work Education Enhancement Program (SWEEP)

    Hines, Alice; Cohen, Edward; Nguyen, Hoa; Drabble, Laurie; Han, Meekyung; Sen, Soma; Tran, Tuan (2017-05-10T05:34:39Z)

    Conference item
    Unitec

    Overview about Vietnam and SW Education in Vietnam SWEEP and its objectives SWEEP Achievements Upcoming activities

    View record details
  • The effectiveness of a commercially available bird repellent on house sparrows (Passer domesticus)

    Cameron, Kristie; Adams, N. J.; Wassenaar, R. J.; Bistricer, A.; Brown, K. J.; Halliday, A. D.; Lodge-Osborn, K. R.; Robson, E. A.; Jones, Graham; Salinsky, Jodi; Fraser, Diane (2016-07)

    Conference item
    Unitec

    Aim: Identify a robust method for assessing the efficacy of an odour repellent to the sparrow in aviary studies Use this method in field studies to isolate the effects of the repellent on sparrow behaviour

    View record details
  • International students’ perceptions of intensive learning in business course delivery : case study of Otago Polytechnic Auckland International Campus

    Piven, Inna; Ho, Henry W. L.; Horvath, George (2017-05-10T05:34:23Z)

    Conference item
    Unitec

    What are the international students’ perceptions of the intensive mode of delivery of business courses at Otago Polytechnic Auckland International Campus? The aim of this study is twofold: 1) to analyse international students’ perceptions of the intensive mode of delivery of business courses at Auckland International Campus of Otago Polytechnic (OP). 2) to evaluate the effects of the intensive format on international students’ academic performance.

    View record details
  • Exploring international students’ learning experiences with Facebook-based applications in the intensive mode of event planning and entrepreneurship course

    Piven, Inna; Ho, H. (2017-05-10T05:34:27Z)

    Conference item
    Unitec

    The study seeks to explore international students’ learning experiences with Facebook-based applications within the eight-week study block in the context of New Zealand business education. By implementing participant observation and two asynchronous Facebook focus groups, the study aims to identify the nature of students’ engagement with a course group on Facebook as well as the influences related to students’ learning experiences and academic performance.

    View record details
  • Modeling the impact of clustering on the lifetime of wireless sensor networks

    Madipour, Farhad; Rahman, M.F.; Murakami, K.J. (2017-05-10T05:34:43Z)

    Conference item
    Unitec

    Energy efficiency and network lifetime are the most critical issues for Wireless Sensor Networks (WSNs). Clustering is one of the well-known techniques for reducing energy consumption of the network and improving its lifetime as well. However, clustering itself is time- and energy-consuming. For this reason, it is crucial to determine an appropriate clustering frequency so that the network lifetime is maximized. We formulate this problem and sketch a guideline on acquiring an optimal number of clusterings.

    View record details
  • To evacuate or stay? : factors which influenced Japanese people's decision-making in emergencies

    Mizutani, Satomi; Dallow, Tomoko (2017-05-10T05:34:44Z)

    Conference item
    Unitec

    Outline: Background •Our Research •Method •Study 1 (Quantitative Study) •Study 2 (Qualitative Study) •Result •Discussion •Conclusion

    View record details
  • Sustainability perceptions : views of international students at a New Zealand Institute

    Panko, Mary; Sharma, Rashika (2017-05-10T05:34:49Z)

    Conference item
    Unitec

    A level-6 course as part of the Bachelor in Applied Technology. Has varied between optional and compulsory. Stress opportunities for individuals, their industries and global benefits. Highlights potential advantages for companies $$$ as well as social and environmental aspects. We have focussed on the Quadruple Bottom Line (Economy, Social, Environmental and Governance) as well as Life Cycles of products. Linked classroom instruction to Industrial experiences e.g. guest lecturers and field trips as well as practical investigations by students

    View record details
  • Standing workstations : experience, acceptability, and effects on occupational sedentary behaviour and metabolic health of office workers

    Archer, D.J.; Robb, S.; Niven, Elizabeth; Moran, Robert (2017-05-10T05:34:58Z)

    Conference item
    Unitec

    So what is SB and when do we do it? • SB is 4h/day (Bauman et al., 2011), close to 25% >6 h/day • Very limited evidence occupational sitting time that 30% of full time employed NZ adults occupational sitting 3.5-4 h/day (Statistics New Zealand, 2015 + drawing in Mummery data) Links: • SB linked with increased levels of psychological disorders SB linked with • increases in colon, rectal, ovarian and endometrial cancer often independent of PA • What interested me is SB linked with increased BMI, waist circumference, blood pressure and decreased HDLC, increased cardiovascular events and all-cause mortality (Mummery et al., 2005; Wijndaele et al., 2009; Bertrais et al. 2005; Stamatakis et al. 2011)

    View record details
  • Separating true range measurements from multi-path and scattering interference in commercial range cameras

    Dorrington, Adrian A.; Godbaz, John Peter; Cree, Michael J.; Payne, Andrew D.; Streeter, Lee V. (2011)

    Conference item
    University of Waikato

    Time-of-flight range cameras acquire a three-dimensional image of a scene simultaneously for all pixels from a single viewing location. Attempts to use range cameras for metrology applications have been hampered by the multi-path problem, which causes range distortions when stray light interferes with the range measurement in a given pixel. Correcting multi-path distortions by post-processing the three-dimensional measurement data has been investigated, but enjoys limited success because the interference is highly scene dependent. An alternative approach based on separating the strongest and weaker sources of light returned to each pixel, prior to range decoding, is more successful, but has only been demonstrated on custom built range cameras, and has not been suitable for general metrology applications. In this paper we demonstrate an algorithm applied to both the Mesa Imaging SR-4000 and Canesta Inc. XZ-422 Demonstrator unmodified off-the-shelf range cameras. Additional raw images are acquired and processed using an optimization approach, rather than relying on the processing provided by the manufacturer, to determine the individual component returns in each pixel. Substantial improvements in accuracy are observed, especially in the darker regions of the scene.

    View record details
  • A two-level learning method for generalized multi-instance problems

    Weidmann, Nils; Frank, Eibe; Pfahringer, Bernhard (2003)

    Conference item
    University of Waikato

    In traditional multi-instance (MI) learning, a single positive instance in a bag produces a positive class label. Hence, the learner knows how the bags class label depends on the labels of the instances in the bag and can explicitly use this information to solve the learning task. In this paper we investigate a generalized view of the MI problem where this simple assumption no longer holds. We assume that an interaction between instances in a bag determines the class label. Our two-level learning method for this type of problem transforms an MI bag into a single meta-instance that can be learned by a standard propositional method. The meta-instance indicates which regions in the instance space are covered by instances of the bag. Results on both artificial and real-world data show that this two-level classification approach is well suited for generalized MI problems.

    View record details
  • An exploration of ebook selection behavior in academic library collections

    McKay, Dana; Hinze, Annika; Heese, Ralf; Vanderschantz, Nicholas; Timpany, Claire; Cunningham, Sally Jo (2012)

    Conference item
    University of Waikato

    Academic libraries have offered ebooks for some time, however little is known about how readers interact with them while making relevance decisions. In this paper we seek to address that gap by analyzing ebook transaction logs for books in a university library.

    View record details
  • Book selection behavior in the physical library: implications for ebook collections

    Hinze, Annika; McKay, Dana; Vanderschantz, Nicholas; Timpany, Claire; Cunningham, Sally Jo (2012)

    Conference item
    University of Waikato

    Little is known about how readers select books, whether they be print books or ebooks. In this paper we present a study of how people select physical books from academic library shelves. We use the insights gained into book selection behavior to make suggestions for the design of ebook-based digital libraries in order to better facilitate book selection behavior.

    View record details
  • IntCal09 and Marine09 radiocarbon age calibration curves, 0-50,000yeats cal BP

    Reimer, Paula J.; Baillie, Mike G.L.; Bard, Edouard; Bayliss, Alex; Beck, J. Warren; Blackwell, Paul G.; Ramsey, Christopher Bronk; Buck, Caitlin E.; Burr, George S.; Edwards, R. Lawrence; Friedrich, Michael; Grootes, P.M.; Guilderson, Thomas P.; Hajdas, Irka; Heaton, Timothy J.; Hogg, Alan G.; Hughen, Konrad A.; Kaiser, K.F.; Kromer, B.; McCormac, F.G.; Manning, S.W.; Reimer, Ron W.; Richards, D.A.; Southon, John R.; Talamo, Sahra; Turney, Chris S.M.; van der Plicht, Johannes; Weyhenmeyer, Constanze E. (2009)

    Conference item
    University of Waikato

    The IntCal04 and Marine04 radiocarbon calibration curves have been updated from 12 cal kBP (cal kBP is here defined as thousands of calibrated years before AD 1950), and extended to 50 cal kBP, utilizing newly available data sets that meet the IntCal Working Group criteria for pristine corals and other carbonates and for quantification of uncertainty in both the 14C and calendar timescales as established in 2002. No change was made to the curves from 0–12 cal kBP. The curves were constructed using a Markov chain Monte Carlo (MCMC) implementation of the random walk model used for IntCal04 and Marine04. The new curves were ratified at the 20th International Radiocarbon Conference in June 2009 and are available in the Supplemental Material at www.radiocarbon.org.

    View record details