Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

Faculty of Informatics - Papers (Archive)

Discipline
Keyword
Publication Year

Articles 1 - 30 of 2013

Full-Text Articles in Physical Sciences and Mathematics

A Novel Approach To Data Deduplication Over The Engineering-Oriented Cloud Systems, Zhe Sun, Jun Shen, Jianming Young Jan 2013

A Novel Approach To Data Deduplication Over The Engineering-Oriented Cloud Systems, Zhe Sun, Jun Shen, Jianming Young

Faculty of Informatics - Papers (Archive)

This paper presents a duplication-less storage system over the engineering-oriented cloud computing platforms. Our deduplication storage system, which manages data and duplication over the cloud system, consists of two major components, a front-end deduplication application and a mass storage system as back-end. Hadoop distributed file system (HDFS) is a common distribution file system on the cloud, which is used with Hadoop database (HBase). We use HDFS to build up a mass storage system and employ HBase to build up a fast indexing system. With a deduplication application, a scalable and parallel deduplicated cloud storage system can be effectively built up ...


Identity-Based Traitor Tracing With Short Private Key And Short Ciphertext, Fuchun Guo, Yi Mu, Willy Susilo Dec 2012

Identity-Based Traitor Tracing With Short Private Key And Short Ciphertext, Fuchun Guo, Yi Mu, Willy Susilo

Faculty of Informatics - Papers (Archive)

Identity-based traitor tracing (IBTT) scheme can be utilized to identify a private (decryption) key of any identity that is illegally used in an identity-based broadcast encryption scheme. In PKC'07, Abdalla et al. proposed the first IBTT construction with short private key. In CCS'08, Boneh and Naor proposed a public-key traitor tracing, which can be extended to IBTT with short ciphertext. With a further exploration, in this paper, we propose the first IBTT with short private key and short ciphertext. Private key and ciphertext are both order of O(l 1+l 2), where l 1 is the bit ...


Implementing Vertical And Horizontal Engineering Students' Integration And Assessment Of Consequence Academic Achievement, Sarim Al-Zubaidy, Nidhal Abdulaziz, Reza Dashtpour Jul 2012

Implementing Vertical And Horizontal Engineering Students' Integration And Assessment Of Consequence Academic Achievement, Sarim Al-Zubaidy, Nidhal Abdulaziz, Reza Dashtpour

Faculty of Informatics - Papers (Archive)

Recent scholarship references indicate that integration of the student body can result in an enhanced learning experience for students and also greater satisfaction. This paper reports the results of a case study whereby mechanical engineering students studying at a newly established branch campus in Dubai of a British university were exposed to vertical and horizontal integration. Different activities have been embedded to ensure that students integrated and worked together with their peers and colleagues at different levels. The implemented processes and practices led to improved academic achievements, which were better than those of a similar cohort of students where no ...


Determinants Of Rfid Technology Adoption Intention In The Saudi Retail Industry: An Empirical Study, Salem Alqahtani, S. F. Wamba Jan 2012

Determinants Of Rfid Technology Adoption Intention In The Saudi Retail Industry: An Empirical Study, Salem Alqahtani, S. F. Wamba

Faculty of Informatics - Papers (Archive)

Drawing both on innovation diffusion theory and Radio frequency identification (RFID) technology, this paper assesses the influence of a set of determinants on the intention of Saudi Arabian retail firms to adopt RFID technology. In this study, a two-phase, multi-method approach was used. In the first phase, an interview-based case study was used, while in the second phase, we conducted a survey to gather data from 7 large retailers in Saudi Arabia. Our findings indicate that while the RFID relative advantage, the top management support and information intensity do not have any influence on the intention of Saudi Arabia retail ...


Transport Commons: A Community Based Public Transport System, Farzad Safaei Jan 2012

Transport Commons: A Community Based Public Transport System, Farzad Safaei

Faculty of Informatics - Papers (Archive)

In this paper we present a generalization of the concept of car-pooling for a public transport system, in which members of the community donate their trips to the 'transport commons'. The proposed system will then match the passengers to vehicles based on a range of criteria, including trip times, personal choices and economic incentives. We develop an analytical model to determine the probability of obtaining a ride from the transport commons in a worst-case scenario. The results of the analysis as well as simulation study demonstrate that the transport commons can provide a practical basis for a dependable public transport ...


A Unified Study Of Epidemic Routing Protocols And Their Enhancements, Zuyong Feng, Kwan-Wu Chin Jan 2012

A Unified Study Of Epidemic Routing Protocols And Their Enhancements, Zuyong Feng, Kwan-Wu Chin

Faculty of Informatics - Papers (Archive)

Epidemic protocols belong to a class of routing paradigm that have wide ranging applications in Delay Tolerant Networks (DTNs) due to their simplicity, low delays, and little to no reliance on special nodes. To this end, a comprehensive study of their performance will serve as an important guide to future protocol designers. Unfortunately, to date, there is no work that studies epidemic routing protocols using a common framework that evaluates their performance objectively using the same mobility model and parameters. To this end, we study four categories of epidemic routing protocols. Namely, P-Q epidemic, epidemic with Time-To-Live (TTL), epidemic with ...


Intelligent Load Management In Microgrids, J Kennedy, Philip Ciufo, Ashish Agalgaonkar Jan 2012

Intelligent Load Management In Microgrids, J Kennedy, Philip Ciufo, Ashish Agalgaonkar

Faculty of Informatics - Papers (Archive)

The increased levels of distributed generator (DG) penetration and the customer demand for high levels of reliability have attributed to the formation of the Microgrid concept. The Microgrid concept contains a variety of technical challenges, including load management and anti-islanding protection discrimination strategies. This paper provides a novel scheme in which loads and DG are able to detect the conditions where the load of the island cannot be sufficiently supplied. In these instances, a load shedding algorithm systematically removes loads from the system until an island can be maintained within satisfactory operating limits utilising the local DG. The concept of ...


Rfid-Enabled Healthcare Applications, Issues And Benefits: An Archival Analysis (1997-2011), S F. Wamba Jan 2012

Rfid-Enabled Healthcare Applications, Issues And Benefits: An Archival Analysis (1997-2011), S F. Wamba

Faculty of Informatics - Papers (Archive)

In this paper, a comprehensive review of articles published between 1997 and 2011 in the Journal of Medical Systems (JMS) on RFID technology is presented. A total of 22 papers are analyzed using a classification framework that has three dimensions: RFID-enabled healthcare applications, RFID-enabled healthcare issues, and RFID-enabled healthcare benefits. In addition, an invitation sent to all authors of the papers accepted for the special issue on RFID for the JMS allows them to position their various papers within the classification framework. Finally, a list of future research directions is presented.


Business Value Of Rfid-Enabled Healthcare Transformation Projects, Anand Abijith, S. F. Wamba Jan 2012

Business Value Of Rfid-Enabled Healthcare Transformation Projects, Anand Abijith, S. F. Wamba

Faculty of Informatics - Papers (Archive)

Purpose – This paper aims to assess the business value realised from radio frequency identification (RFID)-enabled healthcare transformation projects as compared with other industries. The paper starts with a review of RFID technology in the healthcare industry and further extends to an in-depth analysis of mini-case studies collected from RFID Journal, a leading professional journal dedicated to RFID technology, in order to identify the major benefits of the implementation of RFID systems as well as its business value achieved. In addition, there is further analysis that is being carried out on other industries to have an overview of the benefits ...


Evaluating Usage Of Wsmo And Owl-S In Semantic Web Services, Lina Azleny Kamaruddin, Jun Shen, Ghassan Beydoun Jan 2012

Evaluating Usage Of Wsmo And Owl-S In Semantic Web Services, Lina Azleny Kamaruddin, Jun Shen, Ghassan Beydoun

Faculty of Informatics - Papers (Archive)

Applying ontologies is the most promising approach to semantically enrich Web services. To facilitate this, two efforts contributed the most in enabling the creation of ontologies: OWL-S from the US and WSMO in Europe. These two compete and promote their ontologies from the design perspective, reflecting their inventors’ bias but not offering much help to Web service developers using them. To bypass existing biases and enable evaluation of ontologies expressed in these two languages, this paper provides a study of the two important facilitators, OWL-S and WSMO, surveying their usage in several SWS Projects and identifying their respective and outstanding ...


Attrition From Australian Ict Degrees - Why Women Leave, Madeleine R. H Roberts, Tanya J. Mcgill, Peter N. Hyland Jan 2012

Attrition From Australian Ict Degrees - Why Women Leave, Madeleine R. H Roberts, Tanya J. Mcgill, Peter N. Hyland

Faculty of Informatics - Papers (Archive)

Student attrition is of particular concern in the field of ICT because the industry faces staffing shortfalls, generally and a noticeable lack of female employees. This paper explores the reasons female students give for leaving their ICT courses. An online survey of early leavers from four Australian universities was conducted. The results show that, for many students, it is a combination of issues that leads to their withdrawal. Contrary to expectations, few female ex-students had experienced serious life events that necessitated their withdrawal or indicated that negative behaviour or attitudes had contributed to their decision to leave. More commonly female ...


A Fundamental Analysis Of Continuous Flow Bioreactor And Membrane Reactor Models With Tessier Kinetics, M I. Nelson, E Balakrishnan, H S. Sidhu Jan 2012

A Fundamental Analysis Of Continuous Flow Bioreactor And Membrane Reactor Models With Tessier Kinetics, M I. Nelson, E Balakrishnan, H S. Sidhu

Faculty of Informatics - Papers (Archive)

In this research we analyze the steady-state operation of a continuous flow bioreactor, with or without recycle, and an idealized or nonidealized continuous flow membrane reactor. The model extends to include a fixed bed reactor where a fraction of the biomass is detached by the flow. The reaction is assumed to be governed by Tessier growth kinetics. We show that a flow reactor with idealized recycle has the same performance as an idealized membrane reactor and that the performance of a nonidealized membrane reactor is identical to that of an appropriately defined continuous flow bioreactor with nonidealized recycle. The performance ...


Evaluating The Volatility Forecasting Performance Of Best Fitting Garch Models In Emerging Asian Stock Markets, Chaiwat Kosapattarapim, Yan-Xia Lin, Michael Mccrae Jan 2012

Evaluating The Volatility Forecasting Performance Of Best Fitting Garch Models In Emerging Asian Stock Markets, Chaiwat Kosapattarapim, Yan-Xia Lin, Michael Mccrae

Faculty of Informatics - Papers (Archive)

While modeling the volatility of returns is essential for many areas of finance, it is well known that financial return series exhibit many non-normal characteristics that cannot be captured by the standard GARCH model with a normal error distribution. But which GARCH model and which error distribution to use is still open to question, especially where the model that best fits the in-sample data may not give the most effective out-of-sample volatility forecasting ability. Approach: In this study, six simulated studies in GARCH(p,q) with six different error distributions are carried out. In each case, we determine the best ...


Further Analysis Of A Practical Hierarchical Identity-Based Encryption Scheme, Ying Sun, Yong Yu, Yi Mu Jan 2012

Further Analysis Of A Practical Hierarchical Identity-Based Encryption Scheme, Ying Sun, Yong Yu, Yi Mu

Faculty of Informatics - Papers (Archive)

No abstract provided.


Boundary Quotients Of The Toeplitz Algebra Of The Affine Semigroup Over The Natural Numbers, Nathan Brownlowe, Astrid An Huef, Marcelo Laca, Iain Raeburn Jan 2012

Boundary Quotients Of The Toeplitz Algebra Of The Affine Semigroup Over The Natural Numbers, Nathan Brownlowe, Astrid An Huef, Marcelo Laca, Iain Raeburn

Faculty of Informatics - Papers (Archive)

No abstract provided.


Estimating Variance Components And Predicting Breeding Values For Eventing Disciplines And Grades In Sport Horses, I D. Stewart, I.M S. White, Arthur R. Gilmour, R Thompson, J A. Woolliams, S Brotherstone Jan 2012

Estimating Variance Components And Predicting Breeding Values For Eventing Disciplines And Grades In Sport Horses, I D. Stewart, I.M S. White, Arthur R. Gilmour, R Thompson, J A. Woolliams, S Brotherstone

Faculty of Informatics - Papers (Archive)

Eventing competitions in Great Britain (GB) comprise three disciplines, each split into four grades, yielding 12 discipline-grade traits. As there is a demand for tools to estimate (co)variance matrices with a large number of traits, the aim of this work was to investigate different methods to produce large (co)variance matrices using GB eventing data. Data from 1999 to 2008 were used and penalty points were converted to normal scores. A sire model was utilised to estimate fixed effects of gender, age and class, and random effects of sire, horse and rider. Three methods were used to estimate (co ...


Integration On Locally Compact Noncommutative Spaces, A L. Carey, V Gayral, Adam C. Rennie, F A. Sukochev Jan 2012

Integration On Locally Compact Noncommutative Spaces, A L. Carey, V Gayral, Adam C. Rennie, F A. Sukochev

Faculty of Informatics - Papers (Archive)

We present an ab initio approach to integration theory for nonunital spectral triples. This is done without reference to local units and in the full generality of semifinite noncommutative geometry. The main result is an equality between the Dixmier trace and generalised residue of the zeta function and heat kernel of suitable operators. We also examine definitions for integrable bounded elements of a spectral triple based on zeta function, heat kernel and Dixmier trace techniques. We show that zeta functions and heat kernels yield equivalent notions of integrability, which imply Dixmier traceability.


A Survey On Bio-Inspired Algorithms For Web Service Composition, Lijuan Wang, Jun Shen, Jianming Yong Jan 2012

A Survey On Bio-Inspired Algorithms For Web Service Composition, Lijuan Wang, Jun Shen, Jianming Yong

Faculty of Informatics - Papers (Archive)

Web service composition has become a promis- ing technology in a variety of e-science or e-business areas. There are a variety of models and methods to deal with this issue from dierent aspects. Bio-inspired algorithms are becoming main approaches and solutions. This paper reviews the current researches on web service composition based on bio-inspired algorithms, such as Ant Colony Opti- mization(ACO), Genetic Algorithm(GA), Evolutionary Al- gorithm(EA) and Particle Swarm Optimization(PSO). By analyzing and investigating dierent approaches, this paper gives an overview about the researches on bio-inspired al- gorithm in web service composition and point out future ...


A Novel Scheduler For Concurrent Tx/Rx Wireless Mesh Networks With Weighted Links, Kwan-Wu Chin, Sieteng Soh, Chen Meng Jan 2012

A Novel Scheduler For Concurrent Tx/Rx Wireless Mesh Networks With Weighted Links, Kwan-Wu Chin, Sieteng Soh, Chen Meng

Faculty of Informatics - Papers (Archive)

This paper considers the NP-hard problem of scheduling weighted links in concurrent transmit/receive wireless mesh networks. The problem generalizes existing works to links with weight wij ≥ 1. We propose an O(|V|2) algorithm, where V is the set of routers, that is orders of magnitude faster than computationally intensive approaches that use the well-known Goemans-Williamson (GWA)'s maximum cut algorithm and also brute-force. Our algorithm generates schedules, on average, with at most 3% and 9% fewer links than the GWA and brute-force approaches respectively.


Efficient Oblivious Transfers With Access Control, Jinguang Han, Willy Susilo, Yi Mu, Jun Yan Jan 2012

Efficient Oblivious Transfers With Access Control, Jinguang Han, Willy Susilo, Yi Mu, Jun Yan

Faculty of Informatics - Papers (Archive)

Oblivious transfer (OT) is a protocol where a receiver can obtain t-out-of-n services from the sender without releasing anything about his choices. OT can be used to protect user’s privacy. In principle, any user can interact with a server to request some services. This might allow some undesirable users to obtain services from the server. How to ensure that only the authorized receivers can obtain services obliviously is a daunting task. In this paper, we introduce oblivious signature based-on envelope (OSBE) to OT and propose two novel OT schemes, which only allow the legitimate receivers to obtain services obliviously ...


Homology For Higher-Rank Graphs And Twisted C*-Algebras, Alex Kumjian, David Pask, Aidan Sims Jan 2012

Homology For Higher-Rank Graphs And Twisted C*-Algebras, Alex Kumjian, David Pask, Aidan Sims

Faculty of Informatics - Papers (Archive)

We introduce a homology theory for k-graphs and explore its fundamental properties. We establish connections with algebraic topology by showing that the homology of a k-graph coincides with the homology of its topological realisation as described by Kaliszewski et al. We exhibit combinatorial versions of a number of standard topological constructions, and show that they are compatible, from a homological point of view, with their topological counterparts. We show how to twist the C*-algebra of a k-graph by a T-valued 2-cocycle and demonstrate that examples include all noncommutative tori. In the appendices, we construct a cubical ...


Privacy Enhanced Data Outsourcing In The Cloud, Miao Zhou, Yi Mu, Willy Susilo, Jun Yan, Liju Dong Jan 2012

Privacy Enhanced Data Outsourcing In The Cloud, Miao Zhou, Yi Mu, Willy Susilo, Jun Yan, Liju Dong

Faculty of Informatics - Papers (Archive)

How to secure outsourcing data in cloud computing is a challenging problem, since a cloud environment cannot been considered to be trusted. The situation becomes even more challenging when outsourced data sources in a cloud environment are managed by multiple outsourcers who hold different access rights. In this paper, we introduce an efficient and novel tree-based key management scheme that allows a data source to be accessed by multiple parties who hold different rights. We ensure that the database remains secure, while some selected data sources can be securely shared with other authorized parties.


Efficient And Secure Stored-Value Cards With Leakage Resilience, Fuchun Guo, Yi Mu, Willy Susilo Jan 2012

Efficient And Secure Stored-Value Cards With Leakage Resilience, Fuchun Guo, Yi Mu, Willy Susilo

Faculty of Informatics - Papers (Archive)

Stored-value cards (SVCs) are a kind of smartcards that can be used to store monetary values. SVCs have demonstrated a wide range of applications in commerce. SVCs are in general tamper-resistant, but they are very computationally weak and their security mechanisms are also weak against side-channel attacks. In this paper, we propose an efficient and secure stored-value card system. With the help of pre-computations, storedvalue cards in our scheme are only required to perform simple arithmetic operations and bitwise comparisons. Our system especially for SVCs is secure with unbounded computational leakage resilience. Our novel scheme provides a practical solution to ...


Frequency Selection In Absolute Phase Maps Recovery With Two Frequency Projection Fringes, Yi Ding, Jiangtao Xi, Yanguang Yu, Wengqing Cheng, Shu Wang, Joe F. Chicharo Jan 2012

Frequency Selection In Absolute Phase Maps Recovery With Two Frequency Projection Fringes, Yi Ding, Jiangtao Xi, Yanguang Yu, Wengqing Cheng, Shu Wang, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

In a recent published work we proposed a technique to recover the absolute phase maps of two fringe patterns with different spatial frequencies. It is demonstrated that a number of selected frequency pairs can be used for the proposed approach, but the published work did not provide a guideline for frequency selection. In addition, the performance of the proposed technique in terms of its anti-noise capability is not addressed. In this paper, the rules for selecting the two frequencies are presented based on theoretical analysis of the proposed technique. Also, when the two frequencies are given, the anti-noise capability of ...


Blacr: Ttp-Free Blacklistable Anonymous Credentials With Reputation, Man Ho Au, Apu Kapadia, Willy Susilo Jan 2012

Blacr: Ttp-Free Blacklistable Anonymous Credentials With Reputation, Man Ho Au, Apu Kapadia, Willy Susilo

Faculty of Informatics - Papers (Archive)

Anonymous authentication can give users the license to misbehave since there is no fear of retribution. As a deterrent, or means to revocation, various schemes for accountable anonymity feature some kind of (possibly distributed) trusted third party (TTP) with the power to identify or link misbehaving users. Recently, schemes such as BLAC and PEREA showed how anonymous revocation can be achieved without such TTPs—anonymous users can be revoked if they misbehave, and yet nobody can identify or link such users cryptographically. Despite being the state of the art in anonymous revocation, these schemes allow only a basic form of ...


On Formalizing Inter-Process Relationships, Tri A. Kurniawan, Aditya K. Ghose, Lam-Son Le, Hoa Khanh Dam Jan 2012

On Formalizing Inter-Process Relationships, Tri A. Kurniawan, Aditya K. Ghose, Lam-Son Le, Hoa Khanh Dam

Faculty of Informatics - Papers (Archive)

Most medium to large organizations support large collections of process designs, often stored in business process repositories. These processes are often inter-dependent. Managing such large collections of processes is not a trivial task. We argue that formalizing and establishing inter-process relationships play a critical role in that task leading to a machinery approach in the process repository management. We consider and propose three kinds of such relationships, namely part-whole, inter-operation and generalization-specialization, including their formal definitions, permitting us to develop a machinery approach. Analysis of the relationships relies on the semantically effects annotated process model in BPMN. This paper presents ...


Fault Analysis Of The Katan Family Of Block Ciphers, Shekh Faisal Abdul-Latip, Mohammad Reza Reyhanitabar, Willy Susilo, Jennifer Seberry Jan 2012

Fault Analysis Of The Katan Family Of Block Ciphers, Shekh Faisal Abdul-Latip, Mohammad Reza Reyhanitabar, Willy Susilo, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

In this paper, we investigate security of the KATAN family of block ciphers against differential fault attacks. KATAN consists of three variants with 32, 48 and 64-bit block sizes, called KATAN32, KATAN48 and KATAN64, respectively. All three variants have the same key length of 80 bits. We assume a single-bit fault injection model where the adversary is supposed to be able to corrupt a single random bit of the internal state of the cipher and this fault induction process can be repeated (by resetting the cipher); i.e., the faults are transient rather than permanent. First, we show how to ...


Positive Semidefinite Metric Learning Using Boosting-Like Algorithms, Chunhua Shen, Junae Kim, Lei Wang, Anton Van Den Hengel Jan 2012

Positive Semidefinite Metric Learning Using Boosting-Like Algorithms, Chunhua Shen, Junae Kim, Lei Wang, Anton Van Den Hengel

Faculty of Informatics - Papers (Archive)

The success of many machine learning and pattern recognition methods relies heavily upon the identification of an appropriate distance metric on the input data. It is often beneficial to learn such a metric from the input training data, instead of using a default one such as the Euclidean distance. In this work, we propose a boosting-based technique, termed BOOSTMETRIC, for learning a quadratic Mahalanobis distance metric. Learning a valid Mahalanobis distance metric requires enforcing the constraint that the matrix parameter to the metric remains positive semidefinite. Semidefinite programming is often used to enforce this constraint, but does not scale well ...


Convex Hypersurfaces With Pinched Principal Curvatures And Flow Of Convex Hypersurfaces By High Powers Of Curvature, Ben Andrews, James Mccoy Jan 2012

Convex Hypersurfaces With Pinched Principal Curvatures And Flow Of Convex Hypersurfaces By High Powers Of Curvature, Ben Andrews, James Mccoy

Faculty of Informatics - Papers (Archive)

We consider convex hypersurfaces for which the ratio of principal curvatures at each point is bounded by a function of the maximum principal curvature with limit 1 at infinity. We prove that the ratio of circumradius to inradius is bounded by a function of the circumradius with limit 1 at zero. We apply this result to the motion of hypersurfaces by arbitrary speeds which are smooth homogeneous functions of the principal curvatures of degree greater than one. For smooth, strictly convex initial hypersurfaces with ratio of principal curvatures sufficiently close to one at each point, we prove that solutions remain ...


A New Efficient Optimistic Fair Exchange Protocol Without Random Oracles, Qiong Huang, Guomin Yang, Duncan S Wong, Willy Susilo Jan 2012

A New Efficient Optimistic Fair Exchange Protocol Without Random Oracles, Qiong Huang, Guomin Yang, Duncan S Wong, Willy Susilo

Faculty of Informatics - Papers (Archive)

Optimistic fair exchange (OFE) is a kind of protocols to solve the problem of fair exchange between two parties. Most of the previous work on this topic are provably secure in the random oracle model. In this work, we propose a new construction of OFE from another cryptographic primitive, called time capsule signature. The construction is efficient and brings almost no overhead other than the primitive itself. The security of our new construction is based on that of the underlying primitive without relying on the random oracle heuristic. Applying our generic construction to the time capsule signature scheme recently proposed ...