1,539 results for Conference paper

  • A physical-aware task migration algorithm for dynamic thermal management of SMT multi-core processors

    Madipour, Farhad (2017-05-10T05:37:38Z)

    Conference paper
    Unitec

    This paper presents a task migration algorithm for dynamic thermal management of SMT multi-core processors. The unique features of this algorithm include: 1) considering SMT capability of the processors for task scheduling, 2) using adaptive task migration threshold, and 3) considering cores physical features. This algorithm is evaluated on a commercial SMT quad-core processor. The experimental results indicate that our technique can significantly decrease the average and peak temperature compared to Linux standard scheduler, and two well-known thermal management techniques.

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  • A design methodology for performance maintenance of 3D Network-on-Chip with multiplexed Through-Silicon Vias

    Madipour, Farhad; El-Sayed, M.; Murakami, K.; Said, M. (2017-05-10T05:37:43Z)

    Conference paper
    Unitec

    3D integration is an emerging technology that overcomes 2D integration process limitations. The use of short Through-Silicon Vias (TSVs) introduces a significant reduction in routing area, power consumption, and delay. Though, there are still several challenges in 3D integration technology need to be addressed. It is shown in literature that reducing TSV count has a considerable effect in improving yield. The TSV multiplexing technique called TSVBOX was introduced in [1] to reduce the TSV count without affecting the direct benefits of TSVs. The TSVBOX introduces some delay to the signals to be multiplexed. In this paper, we analyse the TSVBOX timing requirements and deduce a design methodology for TSVBOX-based 3D Network-on-Chip (NoC) to overcome the TSVBOX speed degradation. Performance comparisons under different traffic patterns are conducted to verify our solution. We show that TSVBOX-based 3D NoC performance is highly dependent on the NoC traffic pattern and in most simulation scenarios we tried, it shows almost the same performance of the conventional 3D NoC.

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  • Sharing Building Information using the IFC Data Model for FDS Fire Simulation

    Dimyadi, Johannes; Spearpoint, M.; Amor, R. (2008)

    Conference paper
    Unitec

    This paper describes part of a research project that looks into the potential and challenge of using the Industry Foundation Classes (IFC) open standard building information model in fire engineering design. In particular the paper describes work undertaken to share building geometry and other information with the Fire Dynamics Simulator (FDS) fire simulation model. A commercially available building information modeling (BIM) authoring application has been used to create building geometries and export IFC data files. A web-based conversion tool has been created to generate FDS input data given the output from a dedicated fire engineering IFC parser tool. The capabilities and outcome of data sharing process is illustrated in this paper using a simple test case building.

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  • BIM interoperability limitations : Australian and Malaysian rail projects.

    Kenley, Russell; Harfield, T.; Behnam, A. (2017-05-10T05:38:02Z)

    Conference paper
    Unitec

    Building information modelling (BIM) is defined as a process involving the generation and management of digital representation of physical and functional characteristics of a facility. The purpose of interoperability in integrated or “open” BIM is to facilitate the information exchange between different digital systems, models and tools. There has been effort towards data interoperability with development of open source standards and object- oriented models, such as industry foundation classes (IFC) for vertical infrastructure. However, the lack of open data standards for the information exchange for horizontal infrastructure limits the adoption and effectiveness of integrated BIM. The paper outlines two interoperability issues for construction of rail infrastructure. The issues are presented in two case study reports, one from Australia and one from Malaysia. The each case study includes: a description of the project, the application of BIM in the project, a discussion of the promised BIM interoperability solution plus the identification of the unresolved lack of interoperability for horizontal infrastructure project management. The Moreton Bay Rail project in Australia introduces general software interoperability issues. The Light Rail Extension project in Kuala Lumpur outlines an example of the integration problems related to two different location data structures. The paper highlights how the continuing lack of data interoperability limits utilisation of integrated BIM for horizontal infrastructure rail projects.

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  • Construction management scheduling and control : the familiar historical overview.

    Behman, A.; Harfield, T.; Kenley, Russell (2017-05-10T05:38:02Z)

    Conference paper
    Unitec

    The paper suggests that ‘management by exception’ is an historical default control mechanism based on the perception of control as a static process. However, increasingly scholars claim that a dynamic and proactive systems model is a more effective form of project control. These findings are the result of an historical desktop research method that analysed content from a small sample of scheduling methods and control approaches found in online and university library resources. The concept of control has historically influenced both visualization and analytics of different scheduling methods for construction project management. This paper focuses on two control ideals; static and dynamic control mechanisms. The overview begins with the description of early graphical scheduling techniques: Gantt charts and Harmonogram. It continues with examples of contributors to scheduling and control that include: CPM, PERT, LOB, Flowline and Location Based Management. The finding of this simple history suggests that change is the constant element for project control mechanisms. An object-based digital environment such as the data-rich building information modelling (BIM) appears to be continuing the change for new scheduling methods and control mechanisms.

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  • Performance comparison of IPv4 and IPv6 in peer-peer and client server local area networks

    Kolahi, Samad; Soorty, Burjiz; Chand, Navneet; Qu, Zhang (2010-06-29)

    Conference paper
    Unitec

    In this paper, the performance of IPv4 and IPv6 are compared for both Client-Server and Peer-Peer networks. For both networks, IPv4 produced higher bandwidth for TCP protocol. For UDP, IPv4 and IPv6 showed insignificant bandwidth differences except for packet size of 384 bytes where IPv4 had better performance in client-server environment.

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  • Sociomateriality Implications of Software As a Service Adoption on IT-workers’ Roles and Changes in Organizational Routines of IT Systems Support

    Mbuba, F; Wang, YYC; Olesen, K

    Conference paper
    Auckland University of Technology

    This paper aims to deepen our understanding on how sociomateriality practices influence IT workers’ roles and skill set requirements and changes to the organizational routines of IT systems support, when an organization migrates an on-premise IT system to a software as a service (SaaS) model. This conceptual paper is part of an ongoing study investigating organizations that migrated on-premise IT email systems to SaaS business models, such as Google Apps for Education (GAE) and Microsoft Office 365 systems, in New Zealand tertiary institutions. We present initial findings from interpretive case studies. The findings are, firstly, technological artifacts are entangled in sociomaterial practices, which change the way humans respond to the performative aspects of the organizational routines. Human and material agencies are interwoven in ways that reinforce or change existing routines. Secondly, materiality, virtual realm and spirit of the technology provide elementary levels at which human and material agencies entangle. Lastly, the elementary levels at which human and material entangle depends on the capabilities or skills set of an individual.

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  • Impact of building design on energy usage of Auckland Public Library

    Su, Bin (2016-05)

    Conference paper
    Unitec

    This pilot study is to investigate relationships between Auckland library building design and energy consumption. In Auckland, about sixty public libraries belong to the Auckland Council. A number of Auckland public libraries (32% of the total number of public libraries in Auckland) are used for this study. A whole year monthly energy consumption data and library building plans of the sample libraries are recorded and supplied by the Auckland Council. This study explores impact of building design factors on energy consumption, which is based on real energy consumption data and building design data of Auckland public libraries. This study converted monthly energy consumption data into annual, winter and summer daily mean energy consumptions per unit volume of library building indoor space (kWh/m3/day), which is closely related to building design, indoor thermal conditions and building thermal performance under the local climatic conditions. According to relationships between daily mean energy consumptions per unit volume of library building indoor space (kWh/m3/day) and library building design data, the study presents energy profiles of local libraries and identify major design factors impacting energy consumption of Auckland public libraries.

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  • Impact of building envelope design on energy consumption of light structure school building

    Su, Bin (2016-05)

    Conference paper
    Unitec

    According to the local climate, an Auckland school building normally does not need air conditioning for cooling during the summer and only needs space heating during the winter. Previous study shows that the mean winter energy consumption is about 38% of the mean annual energy consumption of Auckland school buildings. The mean winter extra energy, which mainly includes space heating, water heating and other appliances related to winter indoor thermal conditions, is about 44% of winter energy consumptions. Extra winter energy of a school building is closely related to and impacted by building thermal design and thermal performance. Although different building design factors related to the main architectural feature, building elements and materials can affect the school energy consumption differently and simultaneously, the relationship between building design data and school energy consumption data can still be identified. With a larger number of sample school buildings, this study focuses on impact strength of building design factors on school winter extra energy consumptions and identifies quantitative relationships between the building design data and the winter extra energy consumption data, which can be used to proximately estimate the amount of saving winter extra energy consumption associated with the change of a design datum for the future school development. In Auckland, there are 425 schools including primary, intermediate and high schools. Real energy consumption and building design data of 57 local schools (13.4% of the total number of Auckland schools) are randomly selected for this study.

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  • An artifact-centric business process execution platform

    Ngamakeur, Kan; Yongchareon, Dr. Sira; Liesaputra, Veronica; Liu, Chengfei; Yu, Jian (2016-09)

    Conference paper
    Unitec

    Artifact-centric modeling has become an alternative, yet promising approach of business process (BP) modeling and management as it provides higher flexibility than that of traditional activity-centric approaches. However, existing BP execution engines require artifact-centric models be transformed to executable activity-centric BP languages (e.g., BPEL) in order to be executed and managed. We argue that the model conversion incurs losses of information and affects traceability and monitoring ability of BPs, especially where BPs span across inter-organizations. In this paper, we present the design and implementation of an execution platform for artifact-centric BPs. We evaluated our platform using a case study and that can demonstrate several key benefits over the use of existing systems to run artifact-centric BPs.

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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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  • 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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  • Narratives of relatedness in ecological sustainability in early childhood education in Aotearoa.

    Ritchie, Jenny (2014)

    Conference paper
    Unitec

    This paper provides an overview of the context and some preliminary findings from a current two year Teaching and Learning Research Initiative (TLRI) funded study, “Titiro whakamuri, hokiwhakamua : We are the future, the present and the past: caring for self, others and the environment in early year’s teaching and learning”. Central to the study has been the recognition of interdependent, inter-relatedness as expressed in kaupapa Māori notions of manaakitanga, aroha, and kaitiakitanga , as well as in the ‘ethic of care’ outlined in the work of some Western educational philosophers (P. Martin, 2007; Noddings, 1994). Whilst the data gathered from the ten different early childhood centres is extensive, this paper considers that contributed from Richard Hudson Kindergarten in Dunedin.

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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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