74 results for Conference paper, 2015

  • Field Study for Evaluating Winter Thermal Performance of Auckland School Buildings

    Su, Bin (2015-02)

    Conference paper
    Unitec

    Auckland has a temperate climate with comfortable warm, dry summers and mild, wet winters. An Auckland school normally does not need air conditioning for cooling during the summer and only needs heating during the winter. The Auckland school building thermal design should more focus on winter thermal performance and indoor thermal comfort for energy efficiency. This field study of testing indoor and outdoor air temperatures, relative humidity and indoor surface temperatures of three classrooms with different envelopes were carried out in the Avondale College during the winter months in 2013. According to the field study data, this study is to compare and evaluate winter thermal performance and indoor thermal conditions of school buildings with different envelopes.

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  • Learning for the long haul : developing perceptions of learning affordances in CALL teachers

    Haines, Karen (2015)

    Conference paper
    Unitec

    This presentation reports on an investigation into situated teacher learning and their developing understandings of the affordances of new computer-mediated communication (CMC) tools. In-service teachers need to identify the affordances that a new tool offers for language learning in order to make decisions about which technologies they will choose to support their teaching practice. While general typologies of affordance have been identified for technology use in learning, the kinds of affordance that language teachers perceive in technology have not been specified. Sixteen tertiary teachers in Australia and New Zealand were interviewed over a period of fourteen months with reference to the knowledge they acquired around the use of new technologies in their classrooms. The term ‘learning affordance’ was coined to describe ways in which teachers perceived use of CMC tools promoted language learning in the classroom. Participants identified that new tools allowed students to engage not only with the traditional content of language learning (language skills and learning about the L2 culture) but also to engage with the processes of learning language (in relation to communication, affective factors and autonomy). Teachers also saw affordances for their teaching in relation to these areas. Implications for in-service teacher development include supporting participatory activities for on-going teacher learning such as inquiry, observation and reflection.

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  • Placing nations' sectoral surpluses and deficits into their global context

    Rankin, Keith (2015-07)

    Conference paper
    Unitec

    This statistical presentation builds on previous papers (Rankin 2014a, 2014b) which explore the literature of financial balances. Using current account and general government net lending, the paper analyses private sector and government sector balances for 100 selected countries, including all the major national economies and selections representing the world's regions. This enables us to take a global view of the financial circumstances of national economies, and supra-national regional economies. For any country, domestic and foreign balances must add to zero, an accounting identity. This means that private and government balances combined equal the current account balance. For the world as a whole – a closed financial system – private and government balances add to zero, over any period of time. The world's current account balance is always zero, an accounting identity. In the long run, we would expect to see combined domestic balances in every country approach zero as short-term foreign imbalances resolve through exchange rate mechanisms. This paper uses the period from 1995-2014 as a proxy for the 'recent' long-run, and 2010-14 as the recent post-financial-crisis short run. With governments in many economies seeking to consolidate their fiscal balances in a recent period of private-sector financial caution, accommodations must be found if fiscal targets are to be achieved. The paper investigates which groupings of national economies have provided these accommodations. It notes that, especially over the longer term, New Zealand has an unusually accommodating financial profile.

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  • Progress report on a proposed theory for software development

    Kirk, Diana; MacDonell, Stephen G. (2015-07)

    Conference paper
    Unitec

    There is growing acknowledgement within the software engineering community that a theory of software development is needed to integrate the myriad methodologies that are currently popular, some of which are based on opposing perspectives. We have been developing such a theory for a number of years. In this position paper, we overview our theory along with progress made thus far. We suggest that, once fully developed, this theory, or one similar to it, may be applied to support situated software development, by providing an overarching model within which software initiatives might be categorised and understood. Such understanding would inevitably lead to greater predictability with respect to outcomes.

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  • Free and open source intrusion detection systems : a study

    Tirumala, Sreenivas Sremath; Sathu, Hira; Sarrafzadeh, Hossein (2015-07)

    Conference paper
    Unitec

    Importance of cyber security cannot be denied in the current cyber environment. With continuous growth of internet, cyber security has become a necessity for both big and reputed organizations as well as small businesses and individuals. Intrusion detection systems (IDS) are considered to be an efficient way for detecting and preventing cyber security threats. However, there has been not enough attention and awareness on intrusion detection and prevention systems, especially among small businesses and individuals. Due to this, selection and deployment of IDS is significance in regard to this subject being considered highly technical, expensive and time consuming process. To overcome this, it is necessary to create an awareness of IDS tools which forms the basis of this paper. This study is the first phase of an ongoing research. In this phase, we present a detailed study of three free and open source IDS tools which are most popular in their respective categories. The IDS software used for this study are Suricata, a Network based Intrusion Detection System (NIDS), Samhain, a Host Based Intrusion Detection System (HIDS) and Ironbee, a universal web application firewall system. This study of IDS tools at one place will serve as a knowledge source for both technical and non-technical audience, small businesses which may not afford experienced security consultants. Further, this will also help in identifying suitable IDS software for their respective organization.

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  • Analysis and prevention of account hijacking based incidents in cloud environment

    Tirumala, Sreenivas Sremath; Sathu, Hira; Naidu, Vijay (2015-12)

    Conference paper
    Unitec

    Cloud computing is a technological breakthrough in computing. It has affected each and every part of the information technology, from infrastructure to the software deployment, from programming to the application maintenance. Cloud offers a wide array of solutions for the current day computing needs aided with benefits like elasticity, affordability and scalability. But at the same time, the incidence of malicious cyber activity is progressively increasing at an unprecedented rate posing critical threats to both government and enterprise IT infrastructure. Account or service hijacking is a kind of identity theft and has evolved to be one of the most rapidly increasing types of cyber- attack aimed at deceiving end users. This paper presents an in depth analysis of a cloud security incident that happened on The New York Times online using account hijacking. Further, we present incident prevention methods and detailed incident prevention plan to stop future occurrence of such incidents.

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  • Climate change, natural hazards and the Auckland Unitary Plan : too little too late?

    Murphy, Chris (2015-09)

    Conference paper
    Unitec

    Natural hazards remain a substantial risk for the people of Auckland, its property and its infrastructure. With over 3100 km of coastline and extensive urbanization, Auckland remains vulnerable to hazardous coastal erosion and accretion processes. This new city, which from the first of November 2010 became a new Unitary Authority through the amalgamation of 7 Territorial Authorities and 1 Regional Council, is required by law to instigate a new Auckland Unitary Plan. The final form of this Unitary Plan, particularly the section on natural hazards, will have long-term consequences for Auckland and its ability to mitigate the effects climate change will have on these coastal erosion processes. This paper will outline the background to the proposed Auckland Unitary Plan, analyze the public submissions in the section devoted to natural hazards, and comment on its intention (a first for a Unitary Plan in New Zealand) to include mapping of predicted coastal inundation and sea level rise across the Auckland isthmus. The writer will examine the effect the “new” policy approach to mitigating coastal hazards will have on the existing and future make up of urban settlements in low lying coastal areas. A case study will be presented.

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  • Saving the past : new challenges for earthquake prone buildings in New Zealand

    Murphy, Chris (2015-12)

    Conference paper
    Unitec

    The challenges facing heritage buildings in New Zealand will become all the more significant if legislation to strengthen building code requirements for these buildings is enacted. The strengthening proposals particularly affect old buildings constructed in unreinforced brick masonry. Many of these are “home shop” buildings with home accommodation above the ground floor retail space. Some have heritage value. The proposed legislation will affect all parts of New Zealand, regardless of the particular region’s exposure to earthquake risk. The implications of the upgrade are significant, both for owners and for townscape to which they belong. If the cost puts the viability of the building at risk, the owner will be in a position where demolition is the only feasible option. This could have far reaching implications for the social and heritage wellbeing of many small towns within New Zealand. This paper will report on the submissions to the proposed legislation, particularly as they relate to small-scale unreinforced brick masonry buildings. It will highlight strategies from those submissions that have the potential to enhance the life of some of these buildings, particularly in low risk earthquake zones, without unduly compromising cost and safety considerations.

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  • Constructing a professional education : a new architecture degree at Unitec 1994.

    Francis, Kerry (2015-12)

    Conference paper
    Unitec

    Abstract: In 1994 Unitec Institute of Technology welcomed its first cohort of enthusiastic students into the new Bachelor of Architecture programme within the School of Architecture and Construction. This new programme, a second architecture programme in Auckland city, was reportedly initiated by professional dissatisfaction with the lack of work preparedness of the graduates from the existing architecture programmes in the country. Little has been written, to date, about the origins of this new programme. Architecture programmes globally are evolving to meet contemporary needs and the discourse surrounding the beginnings of this programme may shed light on current trajectories. Situating the programme within a School of Architecture and Construction was part of a strategy to produce an architectural graduate who was more practice focused. But how was this intention manifest in the programme organisation and what were the distinctive features of this new programme that were designed to meet this objective? This paper will examine the originating documents and the context in which this programme was developed. It argues that, while the proposed curriculum and course structure contain elements that meet this professional, practice focused need, there are other elements embedded within the course that have a more expansive vision.

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  • An intelligent student advising system using collaborative filtering

    Ganeshan, Kathiravelu; Li, Xiaosong (2015-10)

    Conference paper
    Unitec

    We propose a web based intelligent student advising system using collaborative filtering, a technique commonly used in recommendation systems assuming that users with similar characteristics and behaviors will have similar preferences. With our advising system, students are sorted into groups and given advice based on their similarities to the groups. If a student is determined to be similar to a group students, a course preferred by that group might be recommended to the student. K-means algorithm has been used to determine the similarity of the students. This is an extremely efficient and simple algorithm for clustering analysis and widely used in data mining. Given a value of K, the algorithm partitions a data set into K clusters. Seven experiments on the whole data set and ten experiments on the training data set and testing data set were conducted. A descriptive analysis was performed on the experiment results. Based on these results, K=7 was identified as the most informative and effective value for the K-means algorithm used in this system. The high performance, merit performance and low performing student groups were identified with the help of the clusters generated by the K-means algorithm. Future work will make use of a two-phase approach using Cobweb to produce a balanced tree with sub-clusters at the leaves as in [11], and then applying K-means to the resulting sub-clusters. Possible improvements for the student model were identified. Limitation of this research is discussed.

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  • Adaptive background modeling for land and water composition scenes

    Zhao, Jing; Pang, Shaoning; Hartill, Bruce; Sarrafzadeh, Hossein (2015-09)

    Conference paper
    Unitec

    In the context of maritime boat ramps surveillance, this paper proposes an Adaptive Background Modeling method for Land and Water composition scenes (ABM-lw) to interpret the traffic of boats passing across boat ramps. We compute an adaptive learning rate to account for changes on land and water composition scenes, in which the portion of water changes over time due to tidal dynamics and other environmental influences. Experimental comparative tests and quantitative performance evaluations of real-world boat-flow monitoring traffic sequences demonstrate the benefits of the proposed algorithm.

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  • Mobile devices as support systems for health behaviour change

    Nandigam, David; Baghaei, Nilufar; Liang, Haining (2015-05)

    Conference paper
    Unitec

    A Behaviour Change Support System (BCSS) is a socio-technical information system designed to form, alter, or reinforce attitudes, behaviours, or compliance to a regular patterns of activities, and they do so without the use of coercive or deceptive elements. A health BCSS (HBCSS) is then a BCSS aimed at influencing health behaviours and wellbeing in a positive way. Accordingly, mobile devices can represent ideal tools to become the enabler portals for HBCSS. In this research we provide a review of the literature on mobile applications to see if and how they can be classified as HBCSS. We focus our review on Type 1 Diabetes and emphasize on whether persuasive elements are used and, if so, how. This in turn will aid us to assess what is required for mobile devices to become HBCSS.

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  • Effect of quantization on competitive co-evolution algorithm - QCCEA versus CCEA

    Tirumala, Sreenivas Sremath; Nandigam, David; Ali, Shahid; Li, Zuojin (2015-02-15)

    Conference paper
    Unitec

    Quantum inspired Evolutionary Algorithm (QEA) which uses qubits has been the basis for the development of many Quantum Inspired algorithms. Di- verging from this, a new Quantum Inspired Competitive Co-evolution algorithm (QCCEA) has been proposed by quantifying Competitive Co-evolution Algorithm (CCEA) using a new method of representation. In the literature, the performance of QCCEA against CCEA was evaluated for numerical optimization problems. In this paper we have further analysed the performance of QCCEA using Maze problem which server as the primary investigation for combinatorial optimization problems. In the process of evaluating the performance of QCCEA against CCEA, we have performed three different experiments on the Maze problem. The results show that QCCEA has produced more diversified solutions compared to CCEA at the expense of time variable.

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  • The effect of vapour-control membrane technology on indoor air quality in buildings

    Berry, Terri-Ann; Chiswell, Jordan H.D (2015-11)

    Conference paper
    Unitec

    The impact of the inclusion of a vapour check membrane in timber buildings on indoor air quality, measured as volatile organic compounds (VOCs), was determined by Photo Ionization Detection. Two identical buildings were constructed except one building (test) contained an Intello vapour check membrane and the other building was the control. A VOC source (Wattyl Estapol High Performance Interior Clear Polyurethane Satin varnish) was placed in each building and the subsequent concentrations were monitored until background levels were resumed. Data analysis demonstrated that the VOC levels in the test house were consistently higher than those established in the control house (student t-test > 99.9% confidence). Average concentrations for VOC, temperature and relative humidity respectively were 3.23 ppm (control), 6.54 ppm (test); 17.3°C (control), 17.4°C (test) and 52.4% (control) and 54.7% (test). The humidity was also significantly higher in the test house (student t-test >99.9% confidence). Originally temperature differences were not found to be statistically conclusive; however this appeared to have been because the diurnal pattern of the temperature profile masked the difference in temperature. By removing this diurnal pattern, the temperatures in the houses were found to be significantly different over a 7 day timescale (student t-test >99.9% confidence). Diurnally, there was a strong link between VOC concentration and temperature and an inverse relationship with relative humidity. The use of the vapour control membrane had a significant effect on the indoor air quality of the buildings (based on the concentration of VOCs) which may have been due to: (1) the increased temperature and humidity, (2) the change in air flow from outside the buildings or (3) a combination of all three factors. There is a strong link between VOC concentration and temperature within the houses which may explain the highly variable profile of VOC concentration with time. An inverse relationship was observed with relative humidity.

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  • Understanding water quality in Raglan Harbour

    Greer, S. D.; McIntosh, R.; Harrison, S.; Phillips, David; Mead, S. (2015-09)

    Conference paper
    Unitec

    Raglan (Whaingaroa) Harbour is located on the west coast of New Zealand’s North Island and is bordered by the Raglan township on the southern side close to the entrance. Land use in the watershed is dominated by dairy farming and forestry, which impact harbour water quality. A consented wastewater outfall is located at the harbour mouth close to the densely developed and populated area of the catchment. Over the years, there have been a number of reported spills and unlicensed releases from the treatment facility into the harbour. However, there is little context of the scale of the operation, and of the spills, against contaminant levels from inflowing rivers which are affected by land use practices. We address these uncertainties using a numerical modelling approach. Here we present a calibrated hydrodynamic model linked to a 13-river catchment model. Both of these models are used to drive a subsequent water quality model which simulates the transport and decay of Faecal Coliforms (FC) in the harbour. Model runs include a yearlong simulation of 2012 in its entirety, as well as a wastewater spill event that occurred in June of 2013. Results illustrate the seasonality of the water quality in the harbour with the largest concentrations of FC occurring in winter. It also illustrates the large scale influence of the rivers relative to the outfall with regards to FC concentrations. However, uncertainties remain in the FC component of the water quality model which needs to be addressed in future work

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  • Application of climate change adaptation, resilience, and beach management strategies on coral Islands

    Mead, Shaw; Borrero, Jose; Phillips, David; Atkin, Ed (2015-09)

    Conference paper
    Unitec

    Small Island Developing States (SIDS) are particularly vulnerable to climate change, climate variability and sea level rise. For many island nations, the very existence of some low-lying islands and their associated communities are threatened. International aid funds are now being applied to the development of climate change adaptation and resilience measures on coral islands worldwide. In many areas, identification of vulnerable sites and planning has been completed and climate change adaptation and resilience measures are being implemented. These measures are often directed at ‘buying time’ to develop long-term relocation strategies. However, the coastal processes on coral sand beaches and coasts are significantly different to temperate coasts. There is comparatively little information available that considers the design and application of coastal structures and the associated components of coastal climate change adaptation and resilience measures for coral beaches. Additional challenges include isolation and the lack of suitable equipment and materials with which to implement climate change resilience and adaptation strategies. This paper presents the investigations, detailed designs and implementation of climate change adaptation and resilience measures in Tonga, the Marshall Islands and Mauritius, as well as the development and application of beach management strategies in other parts of the Pacific Islands. There is a common theme between the development of climate change adaptation and resilience measures and beach management strategies for these coral sand beaches with respect to coastal processes and the physical and biological components that produce and transport sand in these systems. Coupling of physical/biological and social/terrestrial/coastal factors is an important consideration for the successful application of coastal strategies on coral sand beaches. The measures that are being applied to the different sites, in order to work with their site specific variables, are detailed.

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  • Challenges facing BIM education : development of BIM resources for teaching and learning

    Puolitaival, Taija; Forsythe, Perry; Kähkönen, Kalle (2015-07)

    Conference paper
    Unitec

    Building Information Modelling (BIM) is becoming the new norm in the AEC industry and also part of many construction project management (CPM) programmes. In terms of teaching BIM there is the need for specific resources in explaining the theoretical principles of BIM, BIM tools (authoring, audit and analysis) and building models themselves. Theoretical resources that are available for education in the form of books, articles and websites are easy and straightforward to locate. Likewise a good share of various tools are available for educational purposes. On the other hand, actual building models represent a challenge in terms of preparing and optimising usage of the model for high quality educational purposes. This paper addresses the difficulty inwalking the narrow line between an industry ready BIM versus a BIM that is good for student learning and offers a realistic and practical, but simultaneously achievable learning environment. Conducting a case study in an undergraduate CPM education setting, three approaches for obtaining BIM resources were identified with various challenges and benefits. A combination of internally developed models for early exposure and industry models for later courses is proposed.

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  • Construction project control methodologies and productivity improvement : EVM, BIM, LBM

    Kenley, Russell; Harfield, Toby (2015-09)

    Conference paper
    Unitec

    Construction productivity has been and remains a concern of organizations and governments. Productivity is also a concern of individual projects. A recent survey of 50 international construction project controls professionals found limited support for the effectiveness of three well known project control systems: Earned Value Management (EVM), Building Information Modeling (BIM) and Location Based Management (LBM). Analysis of the data collected during semi-structured interviews highlights two important problems in both commercial and infrastructure projects. The study found that all organizations used one or more of these methodologies. However, each of the methodologies was considered effective only for some projects or some parts of those projects. It appears that a major reason for lack of effectiveness is that project team capability and capacity to implement the methodology effectively was variable. However, it may be that an even more important factor is linked to the ineffective implementation; lack of understanding the theory that underpins these types of project control methodologies. EVM, BIM and LBM are all systemic methodologies aimed at reduction of waste as a means to improve productivity, thus all require consistent project process: data collection, monitoring, reporting and forecasting for effective control.

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  • Public data re-use policy, but not for road construction in Australia

    Kenley, Russell; Harfield, Toby; Bedggood, Julianna (2015-07)

    Conference paper
    Unitec

    Australian states are mandated to provide researchers access to public sector information (PSI) through three legislative mechanisms: Public Sector Information, Public Records and Freedom of Information. In theory open government is possible because digital technologies allow all PSI to be accessible. Thus, construction management researchers should be able to access public construction documents via government Internet sites. However, this pilot study of 30 road projects indicates a gap between theory and practice. An archival method was used to search the online procurement documents of three states; New South Wales, Western Australia and Queensland. The searches aimed to find the five commonly used road construction procurement documents that could be used by construction management researchers for comparative analysis. However, documentation for road projects could not always be found. Analysis of the search process and the type of procurement documents accessed indicates significant open PSI differences in these three states. Discussion of the application of the three types of public sector information access legislation is one way of making sense of the variability of access to EOI, EIA, RFP, RFT, and Contract procurements documents via an open PSI in a system within a multiplicity of states and departments.

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  • How will NZ's construction industry escalate productivity to meet the largest predicted construction demand in decades - is a lean approach one of the magic bullets?

    Bosnich, Anthony; Kestle, Linda (2015-12)

    Conference paper
    Unitec

    Low productivity levels for at least twenty years in New Zealand’s construction industry have only realised any improvement by increasing hourly inputs, (a 0.2% per annum rise since the 1990’s). NZ’s Productivity Commission in 2010, and the NZ Sector Report by Minister Joyce in 2013, regards increased productivity in the construction industry as essential for the benefit of all New Zealanders, as it affects the Gross Domestic Product, employment rates and living conditions. The construction industry employs around 170 000 people, and predictions are that there will be unprecedented building and construction growth over the next 5-10 years, due in the main to Auckland’s predicted 25% population growth by 2025, and Christchurch’s rebuild following the major earthquakes four years ago. Auckland will see a 68% increase in new building according to Minster Joyce (2013) outstripping Christchurch’s rebuild demands over the same period. The paper investigated how to potentially and realistically increase productivity and business performance, across design and construction management in the New Zealand Construction Industry, over the next decade or so. An in-depth and critical analysis of relevant international journals, conference papers, and New Zealand government agency and non-agency publications was undertaken. The key findings included a very strong recommendation that senior management personnel in the construction industry need to fully implement a lean management approach in the NZ productivity context, that is then driven by full consultant and on-site employee involvement and ownership.

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