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2007

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Articles 1 - 30 of 1355

Full-Text Articles in Computer Sciences

Unit Rectangle Visibility Graphs, Alice M. Dean, Joanna A. Ellis-Monaghan, Sarah J. Hamilton, Greta Pangborn Dec 2007

Unit Rectangle Visibility Graphs, Alice M. Dean, Joanna A. Ellis-Monaghan, Sarah J. Hamilton, Greta Pangborn

Mathematics, Statistics and Computer Science Faculty Research and Publications

Over the past twenty years, rectangle visibility graphs have generated consider- able interest, in part due to their applicability to VLSI chip design. Here we study unit rectangle visibility graphs, with fixed dimension restrictions more closely modeling the constrained dimensions of gates and other circuit components in computer chip applications. A graph G is a unit rectangle visibility graph (URVG) if its vertices can be represented by closed unit squares in the plane with sides parallel to the axes and pairwise disjoint interiors, in such a way that two vertices are adjacent if and only if there is a non-degenerate …

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Front Matter Dec 2007

Front Matter

Journal of Digital Forensics, Security and Law

No abstract provided.

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Back Matter Dec 2007

Back Matter

Journal of Digital Forensics, Security and Law

No abstract provided.

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Masthead Dec 2007

Masthead

Journal of Digital Forensics, Security and Law

No abstract provided.

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Toward A New Generation Of Ice Sheet Models, Christopher M. Little, Michael Oppenheimer, Richard B. Alley, Venkatramani Balaji, Garry K. C. Clarke, Thomas L. Delworth, Robert Hallberg, David Holland, Christina L. Hulbe, Stan Jacobs, Jesse V. Johnson, Hiram Levy, William Lipscomb, Shawn J. Marshall, Byron R. Parizek, Antony J. Payne, Gavin A. Schmidt, Ronald J. Stouffer, David G. Vaughan, Michael Winton Dec 2007

Toward A New Generation Of Ice Sheet Models, Christopher M. Little, Michael Oppenheimer, Richard B. Alley, Venkatramani Balaji, Garry K. C. Clarke, Thomas L. Delworth, Robert Hallberg, David Holland, Christina L. Hulbe, Stan Jacobs, Jesse V. Johnson, Hiram Levy, William Lipscomb, Shawn J. Marshall, Byron R. Parizek, Antony J. Payne, Gavin A. Schmidt, Ronald J. Stouffer, David G. Vaughan, Michael Winton

Computer Science Faculty Publications

This report summarizes the conclusions and recommendations of a 1-day workshop on ice sheet modeling held at the NOAA Geophysical Fluid Dynamics Laboratory on 8 January 2007, sponsored by NOAA and by the Program in Science, Technology, and Environmental Policy of the Woodrow Wilson School of Public and International Affairs at Princeton University, N. J.

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Automated Refinement And Augmentation Of Web Service Description Files, Marc Fisher Ii, Sebastian Elbaum, Gregg Rothermel Dec 2007

Automated Refinement And Augmentation Of Web Service Description Files, Marc Fisher Ii, Sebastian Elbaum, Gregg Rothermel

School of Computing: Technical Reports

Web Service Description Language (WSDL) is being increasingly used to specify web service interfaces. Specifications of this type, however, are often incomplete or imprecise. For example, cursory examination of the WSDL file for Amazon’s E-Commerce Web Service reveals that it often uses a less specific type where a more specific type is applicable, or declares that elements could be missing where other documentation indicates that they are required. Further, specifications reflecting the temporal relationships between operations are completely missing, which is not surprising since they are not supported by the current WSDL standard. These problems in WSDL specifications can cause …

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A Unified Framework For Solving Multiagent Task Assignment Problems, Kevin Cousin Dec 2007

A Unified Framework For Solving Multiagent Task Assignment Problems, Kevin Cousin

Theses and Dissertations

Multiagent task assignment problem descriptors do not fully represent the complex interactions in a multiagent domain, and algorithmic solutions vary widely depending on how the domain is represented. This issue is compounded as related research fields contain descriptors that similarly describe multiagent task assignment problems, including complex domain interactions, but generally do not provide the mechanisms needed to solve the multiagent aspect of task assignment. This research presents a unified approach to representing and solving the multiagent task assignment problem for complex problem domains. Ideas central to multiagent task allocation, project scheduling, constraint satisfaction, and coalition formation are combined to …

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Settling For Limited Privacy: How Much Does It Help?, Anna M. Shubina Dec 2007

Settling For Limited Privacy: How Much Does It Help?, Anna M. Shubina

Dartmouth College Ph.D Dissertations

This thesis explores practical and theoretical aspects of several privacy-providing technologies, including tools for anonymous web-browsing, verifiable electronic voting schemes, and private information retrieval from databases. State-of-art privacy-providing schemes are frequently impractical for implementational reasons or for sheer information-theoretical reasons due to the amount of information that needs to be transmitted. We have been researching the question of whether relaxing the requirements on such schemes, in particular settling for imperfect but sufficient in real-world situations privacy, as opposed to perfect privacy, may be helpful in producing more practical or more efficient schemes. This thesis presents three results. The first result …

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A Hybrid Multi-Robot Control Architecture, Daylond J. Hooper Dec 2007

A Hybrid Multi-Robot Control Architecture, Daylond J. Hooper

Theses and Dissertations

Multi-robot systems provide system redundancy and enhanced capability versus single robot systems. Implementations of these systems are varied, each with specific design approaches geared towards an application domain. Some traditional single robot control architectures have been expanded for multi-robot systems, but these expansions predominantly focus on the addition of communication capabilities. Both design approaches are application specific and limit the generalizability of the system. This work presents a redesign of a common single robot architecture in order to provide a more sophisticated multi-robot system. The single robot architecture chosen for application is the Three Layer Architecture (TLA). The primary strength …

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A Middle-Ware Level Client Cache For A High Performance Computing I/O Simulator, Michael Bassily Dec 2007

A Middle-Ware Level Client Cache For A High Performance Computing I/O Simulator, Michael Bassily

All Theses

This thesis describes the design and run time analysis of the system level middle-ware cache for Hecios. Hecios is a high performance cluster I/O simulator. With Hecios, we provide a simulation environment that accurately captures the performance characteristics of all the components in a clusterwide parallel file system. Hecios was specifically modeled after PVFS2. It was designed to be extensible and to easily allow for various component modules to be easily replaced by those that model other system types. Built around the OMNeT++ simulation package, Hecios' inner-cluster communication module is easily adaptable to any TCP/IP based protocol and all standard …

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Rendering Principal Direction Contour Lines With Oriented Textures, Kelly Gallagher Dec 2007

Rendering Principal Direction Contour Lines With Oriented Textures, Kelly Gallagher

All Theses

In this paper we explore the use of contour lines in computer graphics as a means of conveying shape to the end-user. Contour lines provide an alternative to traditional realistic rendering styles and may even provide a more appropriate visualization for certain situations. For our images, contour line orientation is established in accordance with principal curvature directions.
We present a method for rendering a texture, oriented in the principal curvature direction, across a traditionally-modeled geometric surface that effectively forms suggestive contour lines to enhance the visualization of that surface. We further extend the method to create animated contour textures, wherein …

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Learning Languages From Positive Data And A Limited Number Of Short Counterexamples, Sanjay Jain, Efim Kinber Dec 2007

Learning Languages From Positive Data And A Limited Number Of Short Counterexamples, Sanjay Jain, Efim Kinber

School of Computer Science & Engineering Faculty Publications

We consider two variants of a model for learning languages in the limit from positive data and a limited number of short negative counterexamples (counterexamples are considered to be short if they are smaller than the largest element of input seen so far). Negative counterexamples to a conjecture are examples which belong to the conjectured language but do not belong to the input language. Within this framework, we explore how/when learners using n short (arbitrary) negative counterexamples can be simulated (or simulate) using least short counterexamples or just ‘no’ answers from a teacher. We also study how a limited number …

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Hybrid Image/Model Based Gaze-Contingent Rendering, Hunter Murphy Dec 2007

Hybrid Image/Model Based Gaze-Contingent Rendering, Hunter Murphy

All Dissertations

A non-isotropic hybrid image/model based gaze-contingent rendering technique utilizing ray casting on a GPU is discussed. Empirical evidence derived from human subject experiments indicates an inverse relationship between a peripherally degraded scene's high-resolution inset size and mean search time, a trend consistent with existing image-based and model-based techniques. In addition, the data suggest that maintaining a target's silhouette edges decreases search times when compared to targets with degraded edges. Benefits of the hybrid technique include simplicity of design and parallelizability, both conducive to GPU implementation.

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Reed-Solomon Codes Construction & Decoding, Samuel J. Parsons Dec 2007

Reed-Solomon Codes Construction & Decoding, Samuel J. Parsons

Honors Capstones

Capstone submitted as a graduation requirement for the BSU Honors Program.

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Improving Information Security Management In Nonprofit Organisations With Action, Mark Carey-Smith, Karen Nelson, Lauren May Dec 2007

Improving Information Security Management In Nonprofit Organisations With Action, Mark Carey-Smith, Karen Nelson, Lauren May

Australian Information Security Management Conference

Information security is vital for protecting important assets of organisations, including the information resources and the organisation’s reputation. In Australia, the nonprofit sector makes a significant contribution to society but is under represented in the information security literature. This paper describes research in progress that is investigating and improving information security management in some nonprofit organisations (NPOs), which incorporates a participatory action research methodology. This approach will enhance the skill set likely to be present in Australian nonprofit organisations, producing a more sustainable solution, as well as contributing to the open literature. The Technology Acceptance Model will be utilised as …

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Web Based Resource Management For Multi-Tiered Web Applications, Bryce Daniel Ott Dec 2007

Web Based Resource Management For Multi-Tiered Web Applications, Bryce Daniel Ott

Theses and Dissertations

The currently emerging trend of building more complex web applications to solve increasingly more involved software problems has led to the the need for a more automated and practical means for deploying resources required by these advanced web applications. As web based applications become more complex and involve more developers, greater system redundancy, and a larger number of components, traditional means of resource deployment become painfully inadequate as they fail to scale sufficiently. The purpose of this research is to provide evidence that a more sound and scalable test and deployment process can be employed and that many of the …

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Evolution Of A Database Security Course: Using Non-Enterprise Teaching Tools, Justin Brown Dec 2007

Evolution Of A Database Security Course: Using Non-Enterprise Teaching Tools, Justin Brown

Australian Information Security Management Conference

This paper examines the issues in delivering a university unit of teaching in database security, examining problems in database environment selection and the ability to provide hands on training for students via oncampus and online modes. Initial problems with Linux and then Windows based enterprise database environments prompted the adoption of Microsoft Access as a database tool that was easier to deliver in-class and online. Though Access is file based and has fundamental flaws in its security implementation (within the enterprise context) it can be tweaked to emulate RDBMS level security, allowing students to see how a properly designed security …

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Information Security Surveys: A Review Of The Methodologies, The Critics And A Pragmatic Approach To Their Purposes And Usage, Alexis Guillot, Sue Kennedy Dec 2007

Information Security Surveys: A Review Of The Methodologies, The Critics And A Pragmatic Approach To Their Purposes And Usage, Alexis Guillot, Sue Kennedy

Australian Information Security Management Conference

Each year the latest information security surveys are released to the computing and business communities. Often their findings and their methodologies are subject to criticism from the information security community, professional bodies and others in the profession. This paper looks at the viewpoints of both the producers and the critics of the surveys. The criticisms cover such issues as the methodologies, the response rates, the experience of the respondents, the design of the questions and the interpretation of the results. This paper looks at these issues and discusses the validity of these criticisms, the impact of the surveys and their …

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Network Security – Is Ip Telephony Helping The Cause?, Paul Hansen, Andrew Woodward Dec 2007

Network Security – Is Ip Telephony Helping The Cause?, Paul Hansen, Andrew Woodward

Australian Information Security Management Conference

The major players in the Public Branch Exchange (PBX) market are moving rapidly towards the implementation of IP Telephony. What will be the effect on network security overall? Will the push to IP Telephony damage the good work already devoted to security networks? As more doorways open up on our networks there is an increased chance we have opened another unseen vector for hackers and other malicious organisation or individuals to access the data stored on server and users workstations, corrupting that data or destroying it. Is it better from a security perspective to have IP telephony only between PBX …

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Taxonomy Of Iphone Activation And Sim Unlocking Methods, Marwan Al-Zarouni, Haitham Al-Hajri Dec 2007

Taxonomy Of Iphone Activation And Sim Unlocking Methods, Marwan Al-Zarouni, Haitham Al-Hajri

Australian Information Security Management Conference

This paper will discuss the different methods of SIM unlocking and activation for the Apple iPhone. Early iPhone activation and SIM card fabrication methods as well as the latest software only methods will be discussed. The paper will examine the benefits and drawbacks of each method. It will provide a step-by-step guide to creating a specially crafted SIM card for an iPhone by using Super SIM and Turbo SIM methods. The paper will also include a section on recovering (unbricking) the iPhone and other advanced hacks

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Network Security Devices And Protocols Using State Model Diagrams, C. Nuangjamnong, D. Veal, S. P. Maj Dec 2007

Network Security Devices And Protocols Using State Model Diagrams, C. Nuangjamnong, D. Veal, S. P. Maj

Australian Information Security Management Conference

Network security is concerned with protecting sensitive information, limiting unauthorised access, and reinforcing network performance. An important factor in network security is encryption. Internet Security Protocol (IPSec) is the de facto open standard for encryption and replaces the older Cisco Encryption Technology (CET). Both encryption protocols are typically implemented and managed using the text based Command Line Interface (CLI). A graphical user interface (GUI) is available; however, it is not routinely used. Regardless of whether the CLI or GUI is used, both encryption suites are complex to implement and manage. State Model Diagrams (SMDs) were developed and successfully used as …

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Device- Versus Network-Centric Authentication Paradigms For Mobile Devices: Operational And Perceptual Trade-Offs, S. Karatzouni, N. L. Clarke, S. M. Furnell Dec 2007

Device- Versus Network-Centric Authentication Paradigms For Mobile Devices: Operational And Perceptual Trade-Offs, S. Karatzouni, N. L. Clarke, S. M. Furnell

Australian Information Security Management Conference

The increasing capability and functionality of mobile devices is leading to a corresponding increase in the need for security to prevent unauthorised access. Indeed, as the data and services accessed via mobile devices become more sensitive, the existing method of user authentication (predominately based upon Personal Identification Numbers) appears increasingly insufficient. An alternative basis for authentication is offered by biometric approaches; which have the potential to be implemented in a non-intrusive manner and also enable authentication to be applied in an ongoing manner, beyond initial point-of-entry. However, the implementation of any authentication mechanism, particularly biometric approaches, introduces considerations of where …

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Importance Of Verification And Validation Of Data Sources In Attaining Information Superiority, Gautham Kasinath, Leisa Armstrong Dec 2007

Importance Of Verification And Validation Of Data Sources In Attaining Information Superiority, Gautham Kasinath, Leisa Armstrong

Australian Information Security Management Conference

Information superiority has been defined as a state that is achieved when a competitive advantage is derived from the ability to exploit a superior information position. To achieve such a superior information position enterprises and nations, alike, must not only collect and record correct, accurate, timely and useful information but also ensure that information recorded is not lost to competitors due to lack of comprehensive security and leaks. Further, enterprises that aim to attain information superiority must also ensure mechanisms of validating and verifying information to reduce the chances of mis-information. Although, research has been carried out into ways to …

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Analysis Of Pki As A Means Of Securing Odf Documents, Gautham Kasinath, Leisa Armstrong Dec 2007

Analysis Of Pki As A Means Of Securing Odf Documents, Gautham Kasinath, Leisa Armstrong

Australian Information Security Management Conference

Public Key Infrastructure (PKI) has for the last two decades been a means of securing systems and communication. With the adoption of Open Document Format (ODF) as an ISO standard, the question remains if the unpopular, expensive, complex and unmaintainable PKI can prove to be a viable means of securing ODF documents. This paper analyses the drawbacks of PKI and evaluates the usefulness of PKI in provisioning robust, cheap and maintainable XML security to XML based ODF. This paper also evaluates the existing research on XML security, more specifically fine grained access control.

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Methods And System For Equalizing Data, Jaiganesh Balakrishnan, Richard K. Martin, C. Richard Johnson Jr. Dec 2007

Methods And System For Equalizing Data, Jaiganesh Balakrishnan, Richard K. Martin, C. Richard Johnson Jr.

AFIT Patents

A method for equalizing data and systems utilizing the method. The method of this invention for equalizing (by shortening the channel response) data includes minimizing a function of the data and a number of equalizer characteristic parameters, where the function utilizes auto-correlation data corresponding to equalized data. Updated equalizer characteristic parameters are then obtained from the minimization and an initial set of equalizer characteristic parameters. Finally, the received data is processed utilizing the equalizer defined by the minimization. The method of this invention can be implemented in an equalizer and the equalizer of this invention may be included in a …

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A Conceptual Model For Security Outsourcing, K. Samarasinghe, M. Warren, G. Pye Dec 2007

A Conceptual Model For Security Outsourcing, K. Samarasinghe, M. Warren, G. Pye

Australian Information Security Management Conference

This research analyses the current literature on IT security outsourcing and the organisational attitudes towards this approach to determine the applicability of outsourcing IT security in a commercial environment. A conceptual model is developed as the main goal of research which provides guidance in the process of outsourcing IT security functions to a third-party security service provider. The research conducted has established a complete process for outsourcing IT security.

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Security Issues Within Virtual Worlds Such As Second Life, Chia Yao Lee, Matthew Warren Dec 2007

Security Issues Within Virtual Worlds Such As Second Life, Chia Yao Lee, Matthew Warren

Australian Information Security Management Conference

The advancement in Internet and bandwidth has resulted in a number of new applications to be developed. An area of advancement has been in the development of virtual worlds, where people can interact together via virtual characters. Virtual World systems have been so complex that virtual lives can be lived, including all aspect of life such as education, commerce, social activities etc. Not surprisingly, the problems that exist in the real world such as theft, fraud, vandalism and terrorism, also exist in the virtual worlds. The more developed these virtual worlds become the greater the breaches of security will be …

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The Phantasm Of Atm Withdrawal, Nattakant Utakrit Dec 2007

The Phantasm Of Atm Withdrawal, Nattakant Utakrit

Australian Information Security Management Conference

Despite the stringent legislation and increased enforcement aimed at combating financial crime, fraud using cash machines remains a public concern. The problem of ATM fraud is happening on a global scale and the ramifications have been felt in Australia. This paper highlights the stratagems of financial crime, in particular of ATM fraud. The abuse of ATMs with intelligent methods used by perpetrators will be discussed. At the same time, the paper will present some global cases of ATM fraud. Finally this paper will illustrate countermeasures and security methods, such as biometrics and premises protections of banks, financial institutions and customers, …

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Medical Insecurity: When One Size Does Not Fit All, Patricia A. Williams Dec 2007

Medical Insecurity: When One Size Does Not Fit All, Patricia A. Williams

Australian Information Security Management Conference

Security is most commonly seen as a business concept. This is one reason for the poor uptake and implementation of standard security processes in non-business environments such as general medical practice. It is clear that protection of sensitive patient information is imperative yet the overarching conceptual business processes required to ensure this protection are not well suited to this context. The issue of sensitivity of information, together with the expectation that security can be effectively implemented by non-security trained professionals creates an insecure environment. The general security processes used by business, including those for risk assessment, are difficult to operationally …

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A Single Channel Attack On 915mhz Radio Frequency Identification Systems, Christopher Bolan Dec 2007

A Single Channel Attack On 915mhz Radio Frequency Identification Systems, Christopher Bolan

Australian Information Security Management Conference

There has been some speculation as to the protection offered by the Frequency Hopping Spread Spectrum utilised by RFID technology. This paper explores the construction of an attack based on the broadcast of an attack signal in a single channel. The study details an experiment on two groups of tags where the experimental group are exposed to an attack signal broadcast on a single channel. With consistent findings across both control and experimental groups the experiment clearly demonstrates that FHSS offers no protection against such an attack.

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