UNITEC New Zealand

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UNITEC New Zealand

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Lewthwaite J.R.,Unitec New Zealand | Cornforth I.S.,140 Nixon St | Triggs C.M.,University of Auckland | Bussell W.T.,9a Frances St | Ennis I.L.,3 Tony Segedin Dr
Acta Horticulturae | Year: 2011

The New Zealand vegetable and flower greenhouse industries have largely converted to automated greenhouses using soilless media. A key environmental issue is the sustainable disposal and use of surplus nutrient solutions. The industry commissioned a study to investigate how the water and nutrients in the solutions could be turned into a resource. Application to pasture was selected as the most sustainable option as it has high plant cover and grows year round in New Zealand's temperate climate. A difficult period is winter when slower growth, low nitrogen uptake, high rainfall and low evapotranspiration can make sites unsuitable to receive solutions for several months. The recommendations in the study are based on seasonal pasture growth rates and the Lincoln University Nitrogen Leaching Estimation Model. These show it is environmentally safe to make regular releases to pasture of up to 30 kg N per ha every 21 days, without causing nitrate pollution of groundwater or waterways, provided the site is in a suitable condition. The critical conditions are soil moisture deficit and growth rate of the nitrogen absorbing plant. Future options include nitrogen stripping beds (wetlands, stock pads, sawdust, and greenhouse plant waste) and biodigesters.


Fong A.C.M.,Auckland University of Technology | Zhou B.,IBM | Hui S.C.,Nanyang Technological University | Hong G.Y.,Unitec New Zealand | Do T.A.,Auckland University of Technology
IEEE Transactions on Consumer Electronics | Year: 2011

Web surfing has become a popular activity for many consumers who not only make purchases online, but also seek relevant information on products and services before they commit to buy. The authors propose a web recommender that models user habits and behaviors by constructing a knowledge base using temporal web access patterns as input. Fuzzy logic is applied to represent real-life temporal concepts and requested resources of periodic pattern-based web access activities. The fuzzy representation is used to construct a knowledge base of the user's web access habits and behaviors, which is used to provide timely personalized recommendations to the user. The proposed approach is applicable to delivery of recommendations on consumers' portable devices because compute-intensive processing is performed offline and in advance. With the increasing availability and popularity of webenabled consumer mobile devices, it is believed that the CE world of tomorrow will be increasingly web-oriented. Experiments conducted to evaluate the performance of the proposed approach have shown very good results. © 2011 IEEE.


Komosny D.,Brno University of Technology | Simek M.,Brno University of Technology | Kathiravelu G.,Unitec New Zealand
Przeglad Elektrotechniczny | Year: 2013

The paper deals with IP geolocation based on communication latency measurement. The aim of IP geolocation is to estimate the geographical location of an IP-enabled node. Latency-based IP geolocation methods measure latency from a set of landmarks with the known geographical position to a target with an unknown position. When the latency values are known, the target position is estimated using multilateration. A disadvantage is that for each target's position estimation, a new latency measurement is required. In order to avoid this, it has been proposed to employ a latency prediction method, such as Vivaldi, to predict the latency between a target and a landmark and, thus, reduce the number of latency measurements. In this paper, we investigate this proposal in terms of location accuracy and efficiency. The conclusion of the paper gives an indicative answer about the credibility of Vivaldi for its use in IP geolocation.


Kolahi S.S.,UNITEC New Zealand | Soorty B.K.,UNITEC New Zealand
16th European Conference on Networks and Optical Communications, NOC 2011 | Year: 2011

Optical network is expected to replace the existing electrical networks. In this paper we analyze the bandwidth limitation of electrical Gigabit Ethernet and show that 1Gbps theoretical limit cannot be achieved using electrical interfaces and therefore optical interfaces are required to achieve high bandwidth. The performance of Gigabit Ethernet depends on the operating system used. IPv6 with Windows XP has the lowest bandwidth of 320Mbps while IPv4 with Windows Vista has the highest bandwidth of 700Mbps for the packet size of 1408 Bytes. © 2011 IEEE.


Kolahi S.S.,Unitec New Zealand | Li P.,Unitec New Zealand
IEEE Internet Computing | Year: 2011

IPv6 is built into the latest versions of Microsoft Windows and Linux-based operating systems. It's expected to replace the current IPv4 and solve its numerous problems, such as address exhaustion, security, and mobility. However, implementing IPv6 will have drawbacks, such as lower bandwidth, so it's important to determine which modern operating systems will give the best bandwidth performance over IPv6 networks. © 2011 IEEE.


Galbraith M.,Unitec New Zealand | Jones G.,Unitec New Zealand
Notornis | Year: 2010

An annotated checklist of the birds of Motu Kaikoura (Selwyn Island) in the Hauraki Gulf, New Zealand, is provided from surveys carried out between Dec 2006 and Jun 2008, supplemented by other recent observations. Thirty-seven species were recorded, including 25 species of land or wetland birds, and 12 species of seabirds and shorebirds. A total of 26 species were indigenous and 11 species were exotic. Motu Kaikoura was gazetted as a scenic reserve in 2004, with ecological restoration a key aim of its management. The 564 ha island has low vegetation diversity, reflecting a long history of anthropogenic degradation. Fallow deer (Dama dama), rats (Rattus spp.), mice (Mus musculus) and feral cats (Felis catus) were present on the island. Eradication of invasive mammals has been a management priority, with the bird surveys representing baseline data against which the progress of ecological restoration can be measured. © The Ornithological Society of New Zealand, Inc.


Poletti J.,Unitec New Zealand
Australasian Physical and Engineering Sciences in Medicine | Year: 2011

Manual exposure settings for radiographic projections were once based on a points system which assumed that the HVL in soft tissue is 3.0 cm and that each change of 1.0 cm of soft tissue corresponded to a change of 25% in image receptor dose. A set of mAs steps and equivalent kVp steps was estimated that would give appropriate technique factors for changes in patient thickness. With the advent of rare-earth screen-film systems and AEC systems the points system fell into disuse. Screen-film imaging systems have almost entirely been replaced by CR or DR systems and recently, standardised exposure indices have been recommended by the AAPM and IEC to provide exposure guidance for these systems. If the fundamental assumptions on which the points system was based are still valid for modern high-frequency generators and digital imaging systems, then there would be an elegant correspondence between the predictions of the points system and the requirements for correction of exposure errors indicated by the AAPM and IEC indices. This study estimated the HVL and attenuation per cm in soft tissue using computer simulation, finding that practically, the HVL is between 2.0 and 5.0 cm and attenuation per cm ranges from 15 to 25%. The study concluded that agreement between the points system predictions and the true effects of technique factors changes on dose to the image receptor was moderately good, that use of the points system and technique charts based on this system should be encouraged and that use of the IEC or AAPM digital exposure indices should be standardised. © 2011 Australasian College of Physical Scientists and Engineers in Medicine.


PubMed | Unitec New Zealand
Type: Journal Article | Journal: The clinical teacher | Year: 2010

the London Deanery has provided a web-based resource for supporting the educational development needs of clinical teachers since 2002. This forms part of a range of resources supporting the professional development of clinical teachers and postgraduate supervisors. Following a review in 2007, the deanery commissioned a series of new e-learning modules designed as an introduction to clinical teaching.the deanerys faculty development initiatives are one response to requirements of the Postgraduate Medical Education and Training Board (PMETB), other policy drivers, workforce demands and service changes. Increasingly, doctors are required to provide an educational portfolio of evidence, and satisfy the teaching and training component of Good Medical Practice in revalidation or recertification.E-learning for clinical teachers comprises 16 short, open-access, free-standing modules. The modules are built around a unifying structure, and cover core topics in clinical teaching: feedback; supervision; workplace-based learning; assessment; diversity and equal opportunities; career development; appraisal; lecturing; small group teaching; interprofessional education; and setting learning objectives. The modules can be used as a complementary resource to award-bearing programmes. On completion of a module, a certificate can be printed out for the teachers portfolio.reflective practice and engagement with an individuals teaching practice is encouraged through self-assessment and a reflective log. The open-access, web-based format enables engagement with the material to suit a doctors working and learning patterns, and is a valuable adjunct to other forms of learning. The site has been accessed by over 64000 health professionals (including students, trainees, qualified professionals, supervisors and staff developers) from 155 countries.


PubMed | Unitec New Zealand
Type: Journal Article | Journal: Australasian physical & engineering sciences in medicine | Year: 2011

Manual exposure settings for radiographic projections were once based on a points system which assumed that the HVL in soft tissue is 3.0 cm and that each change of 1.0 cm of soft tissue corresponded to a change of 25% in image receptor dose. A set of mAs steps and equivalent kVp steps was estimated that would give appropriate technique factors for changes in patient thickness. With the advent of rare-earth screen-film systems and AEC systems the points system fell into disuse. Screen-film imaging systems have almost entirely been replaced by CR or DR systems and recently, standardised exposure indices have been recommended by the AAPM and IEC to provide exposure guidance for these systems. If the fundamental assumptions on which the points system was based are still valid for modern high-frequency generators and digital imaging systems, then there would be an elegant correspondence between the predictions of the points system and the requirements for correction of exposure errors indicated by the AAPM and IEC indices. This study estimated the HVL and attenuation per cm in soft tissue using computer simulation, finding that practically, the HVL is between 2.0 and 5.0 cm and attenuation per cm ranges from 15 to 25%. The study concluded that agreement between the points system predictions and the true effects of technique factors changes on dose to the image receptor was moderately good, that use of the points system and technique charts based on this system should be encouraged and that use of the IEC or AAPM digital exposure indices should be standardised.

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