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Accountable Trapdoor Sanitizable Signatures, Junzuo Lai, Xuhua Ding, Yongdong Wu Jan 2013

Accountable Trapdoor Sanitizable Signatures, Junzuo Lai, Xuhua Ding, Yongdong Wu

Research Collection School Of Computing and Information Systems

Sanitizable signature (SS) allows a signer to partly delegate signing rights to a predetermined party, called sanitizer, who can later modify certain designated parts of a message originally signed by the signer and generate a new signature on the sanitized message without interacting with the signer. One of the important security requirements of sanitizable signatures is accountability, which allows the signer to prove, in case of dispute, to a third party that a message was modified by the sanitizer. Trapdoor sanitizable signature (TSS) enables a signer of a message to delegate the power of sanitization to any parties at anytime …


Verifiable And Private Top-K Monitoring, Xuhua Ding, Hwee Hwa Pang Jan 2013

Verifiable And Private Top-K Monitoring, Xuhua Ding, Hwee Hwa Pang

Research Collection School Of Computing and Information Systems

In a data streaming model, records or documents are pushed from a data owner, via untrusted third-party servers, to a large number of users with matching interests. The match in interest is calculated from the correlation between each pair of document and user query. For scalability and availability reasons, this calculation is delegated to the servers, which gives rise to the need to protect the privacy of the documents and user queries. In addition, the users need to guard against the eventuality of a server distorting the correlation score of the documents to manipulate which documents are highlighted to certain …


An Initial Study Of Automatic Curb Ramp Detection With Crowdsourced Verification Using Google Street View Images, Kotaro Hara, Jin Sun, Jonah Chazan, David Jacobs, Jin Froehlich Jan 2013

An Initial Study Of Automatic Curb Ramp Detection With Crowdsourced Verification Using Google Street View Images, Kotaro Hara, Jin Sun, Jonah Chazan, David Jacobs, Jin Froehlich

Research Collection School Of Computing and Information Systems

In our previous research, we examined whether minimallytrained crowd workers could find, categorize, and assesssidewalk accessibility problems using Google Street View(GSV) images. This poster paper presents a first step towardscombining automated methods (e.g., machine visionbasedcurb ramp detectors) in concert with human computationto improve the overall scalability of our approach.


Animal Protection Laws Of Singapore And Malaysia, Alvin W. L. See Jan 2013

Animal Protection Laws Of Singapore And Malaysia, Alvin W. L. See

Research Collection Yong Pung How School Of Law

This article offers an overview and assessment of the laws relating to the protection of animals in Singapore and Malaysia. The focus is on identifying the interpretations of the statutory offences of cruelty that will best promote their objectives and effectiveness.


Further Reflection On True Successors And Traditions, John N. Williams Jan 2013

Further Reflection On True Successors And Traditions, John N. Williams

Research Collection School of Social Sciences

No abstract provided.


Deactivation By Unpriming: Does Decrease Of Influence Mean Lowering Of Activation Level?, Lay See Ong, Jennifer Yuk-Yue Tong, Jolene H. Tan Jan 2013

Deactivation By Unpriming: Does Decrease Of Influence Mean Lowering Of Activation Level?, Lay See Ong, Jennifer Yuk-Yue Tong, Jolene H. Tan

Research Collection School of Social Sciences

Question: Unpriming means a decrease in the influence of primed knowledge, but does it also mean a lowered activation level? Method: Measuring the effect of unpriming with Lexical Decision Task instead of random answering. Findings: The answer is NO. Reaction times were faster after individuals first acted upon the primed concept (unpriming).


Towards Secure And Usable Leakage-Resilient Password Entry, Qiang Yan Jan 2013

Towards Secure And Usable Leakage-Resilient Password Entry, Qiang Yan

Dissertations and Theses Collection (Open Access)

Password leakage is one of the most common security threats for pervasive password based user authentication. The design of a secure and usable password entry against password leakage remains a challenge since twenty year ago when the first academic proposal attempted to address it. This dissertation focuses on investigating the difficulty in designing leakage-resilient password entry (LRPE) schemes and exploring the feasibility of constructing secure and usable LRPE schemes with the assistance of state-of-the-art technology. The first work in this dissertation reveals the infeasibility of designing practical LRPE schemes in the absence of trusted devices by investigating the inherent tradeoff …


Understanding And Rejecting Errant Touches On Multi-Touch Tablets, Ke Shu Jan 2013

Understanding And Rejecting Errant Touches On Multi-Touch Tablets, Ke Shu

Dissertations and Theses Collection (Open Access)

Given the pervasion of multi-touch tablet, pen-based applications have rapidly moved onto this new platform. Users draw both with bare fingers and using capacitive pens as they would do on paper in the past. Unlike paper, these tablets cannot distinguish legitimate finger/pen input from accidental touches by other parts of the user’s hand. In this thesis, we refer it to as errant touch rejection problem since users may unintentionally touch the screen with other parts of their hand. In this thesis, I design, implement and evaluate new approaches, bezel-focus rejection, of preventing errant touches on multi-touch tablets. I began the …


Three Essays On Large Panel Data Models With Cross-Sectional Dependence, Yonghui Zhang Jan 2013

Three Essays On Large Panel Data Models With Cross-Sectional Dependence, Yonghui Zhang

Dissertations and Theses Collection (Open Access)

My dissertation consists of three essays which contribute new theoretical results to large panel data models with cross-sectional dependence. These essays try to answer or partially answer some prominent questions such as how to detect the presence of cross-sectional dependence and how to capture the latent structure of cross-sectional dependence and estimate parameters efficiently by removing its effects. Chapter 2 introduces a nonparametric test for cross-sectional contemporaneous dependence in large dimensional panel data models based on the squared distance between the pair-wise joint density and the product of the marginals. The test can be applied to either raw observable data …


A Study Of The Imitation, Collection And Usability Issues Of Keystroke Biometrics, Chee Meng Tey Jan 2013

A Study Of The Imitation, Collection And Usability Issues Of Keystroke Biometrics, Chee Meng Tey

Dissertations and Theses Collection (Open Access)

The majority of authentication systems used today involves passwords, where a user is required to remember and key in the correct password to login. Keystroke biometrics is an alternative approach whereby users are identified by one or more features such as (a) the timing between keystrokes, (b) how long users hold each key and (c) how hard users press each key. It is being assumed in prior research that the way one user types a password/word is different from the way another user types the same password and this characteristic remains stable over time. Existing literature however left open three …


The Limits Of Prosecutorial Discretion In Singapore: Past, Present, And Future, Siyuan Chen Jan 2013

The Limits Of Prosecutorial Discretion In Singapore: Past, Present, And Future, Siyuan Chen

Research Collection Yong Pung How School Of Law

The exercise of prosecutorial discretion is a unique executive act that continues to be very well-protected from public scrutiny in many jurisdictions throughout the world. In this article, I attempt to survey virtually the entire body of case law on the limits of prosecutorial discretion in Singapore. Probably because prosecutorial discretion is protected by the Constitution, it took a while for the Singapore courts to retreat from its initial characterisation of the discretion as absolute and outside the scope of any form of review. Against a wider backdrop of increasing rights-consciousness (especially within the courts) and the public demand for …


Estimation Of Monthly Volatility: An Empirical Comparison Of Realized Volatility, Garch And Acd-Icv Methods, Shouwei Liu, Yiu Kuen Tse Jan 2013

Estimation Of Monthly Volatility: An Empirical Comparison Of Realized Volatility, Garch And Acd-Icv Methods, Shouwei Liu, Yiu Kuen Tse

Research Collection School Of Economics

We apply the ACD-ICV method proposed by Tse and Yang (2011) for the estimation of intraday volatility to estimate monthly volatility, and empirically compare this method against the realized volatility (RV) and generalized autoregressive conditional heteroskedasticity (GARCH) methods. Our Monte Carlo results show that the ACD-ICV method performs well against the other two methods. Evidence on the Chicago Board Options Exchange volatility index (VIX) shows that it predicts the ACD-ICV volatility estimates better than it predicts the RV estimates. While the RV method is popular for the estimation of monthly volatility, its performance is inferior to the GARCH method.


Testing Conditional Independence Via Empirical Likelihood, Liangjun Su, Halbert White Jan 2013

Testing Conditional Independence Via Empirical Likelihood, Liangjun Su, Halbert White

Research Collection School Of Economics

We construct two classes of smoothed empirical likelihood ratio tests for the conditional independence hypothesis by writing the null hypothesis as an infinite collection of conditional moment restrictions indexed by a nuisance parameter. One class is based on the CDF; another is based on smoother functions. We show that the test statistics are asymptotically normal under the null hypothesis and a sequence of Pitman local alternatives. We also show that the tests possess an asymptotic optimality property in terms of average power. Simulations suggest that the tests are well behaved in finite samples. Applications to some economic and financial time …


Does Competition Within The Military Reduce Expropriation?, Madhav S. Aney, Giovanni Ko Jan 2013

Does Competition Within The Military Reduce Expropriation?, Madhav S. Aney, Giovanni Ko

Research Collection School Of Economics

How can agents in the military, which control the means of coercion, commit not to expropriate from producers? In this paper we propose competition within the military as one of the mechanisms that can deter predation and consequently create commitment. In our model, even if agents within the military could expropriate all output costlessly, it is attractive to protect producers from predating military units. This is because there is a marginal defensive advantage and consequently defense is an e ective way to potentially eliminate other military units, reducing competition and leading to higher future payo s. The model predicts that …


Can A Financial Conditions Index Guide Monetary Policy? The Case Of Singapore, Hwee Kwan Chow Jan 2013

Can A Financial Conditions Index Guide Monetary Policy? The Case Of Singapore, Hwee Kwan Chow

Research Collection School Of Economics

In this study, we explore the issue of whether a financial conditions index can serve as a useful guide to monetary policy in the context of Singapore. To this end, we construct an index that comprises not only the usual monetary variables like interest rates, exchange rates and credit expansions but also asset prices such as stock prices and house prices. The choice of these constituent series is motivated by the role they play in the monetary transmission mechanism with consideration given to the key role leverage plays in modern business cycles and the risk-taking channel magnified by the prolonged …


Variable Selection In Nonparametric And Semiparametric Regression Models, Liangjun Su, Yonghui Zhang Jan 2013

Variable Selection In Nonparametric And Semiparametric Regression Models, Liangjun Su, Yonghui Zhang

Research Collection School Of Economics

This chapter reviews the literature on variable selection in nonparametric and semiparametric regression models via shrinkage. We highlight recent developments on simultaneous variable selection and estimation through the methods of least absolute shrinkage and selection operator (Lasso), smoothly clipped absolute deviation (SCAD) or their variants, but restrict our attention to nonparametric and semiparametric regression models. In particular, we consider variable selection in additive models, partially linear models, functional/varying coefficient models, single index models, general nonparametric regression models, and semiparametric/nonparametric quantile regression models.


Demography, Development And The Origin Of Democracy: A Model With Case Studies Of Arachic Athens And Maritime England, Brishti Guha Jan 2013

Demography, Development And The Origin Of Democracy: A Model With Case Studies Of Arachic Athens And Maritime England, Brishti Guha

Research Collection School Of Economics

No abstract provided.


Non-Normality And Heteroscedasticity Robust Lm Tests Of Spatial Dependence, Badi H. Baltagi, Zhenlin Yang Jan 2013

Non-Normality And Heteroscedasticity Robust Lm Tests Of Spatial Dependence, Badi H. Baltagi, Zhenlin Yang

Research Collection School Of Economics

The standard LM tests for spatial dependence in linear and panel regressions are derived under the normality and homoskedasticity assumptions of the regression disturbances. Hence, they may not be robust against non-normality or heteroskedasticity of the disturbances. Following Born and Breitung (2011), we introduce general methods to modify the standard LM tests so that they become robust against heteroskedasticity and non-normality. The idea behind the robustification is to decompose the concentrated score function into a sum of uncorrelated terms so that the outer product of gradient (OPG) can be used to estimate its variance. We also provide methods for improving …


Improving Public Transit Accessibility For Blind Riders By Crowdsourcing Bus Stop Landmark Locations With Google Street View, Kotaro Hara, Shiri Azenkot, Megan Campbell, Cynthia L. Bennett, Vicki Le, Sean Pannella, Robert Moore, Kelly Minckler, Rochelle H. Ng, Jon E. Froehlich Jan 2013

Improving Public Transit Accessibility For Blind Riders By Crowdsourcing Bus Stop Landmark Locations With Google Street View, Kotaro Hara, Shiri Azenkot, Megan Campbell, Cynthia L. Bennett, Vicki Le, Sean Pannella, Robert Moore, Kelly Minckler, Rochelle H. Ng, Jon E. Froehlich

Research Collection School Of Computing and Information Systems

Low-vision and blind bus riders often rely on known physicallandmarks to help locate and verify bus stop locations (e.g., bysearching for a shelter, bench, newspaper bin). However, there arecurrently few, if any, methods to determine this information apriori via computational tools or services. In this paper, weintroduce and evaluate a new scalable method for collecting busstop location and landmark descriptions by combining onlinecrowdsourcing and Google Street View (GSV). We conduct andreport on three studies in particular: (i) a formative interviewstudy of 18 people with visual impairments to inform the designof our crowdsourcing tool; (ii) a comparative study examiningdifferences between physical …


Entropy-Based Analysis And Bioinformatics-Inspired Integration Of Global Economic Information Transfer, Jinkyu Kim, Gunn Kim, Sungbae An, Young-Kyun Kwon, Sungroh Yoon Jan 2013

Entropy-Based Analysis And Bioinformatics-Inspired Integration Of Global Economic Information Transfer, Jinkyu Kim, Gunn Kim, Sungbae An, Young-Kyun Kwon, Sungroh Yoon

Research Collection School Of Economics

The assessment of information transfer in the global economic network helps to understand the current environment and the outlook of an economy. Most approaches on global networks extract information transfer based mainly on a single variable. This paper establishes an entirely new bioinformatics-inspired approach to integrating information transfer derived from multiple variables and develops an international economic network accordingly. In the proposed methodology, we first construct the transfer entropies (TEs) between various intra- and inter-country pairs of economic time series variables, test their significances, and then use a weighted sum approach to aggregate information captured in each TE. Through a …


Book Review: Remedies For Breach Of Contract By Solene Rowan, Howard Hunter Jan 2013

Book Review: Remedies For Breach Of Contract By Solene Rowan, Howard Hunter

Research Collection Yong Pung How School Of Law

No abstract provided.


Educating For The Future: Teaching Evidence In The Technological Age, Denise H. Wong Jan 2013

Educating For The Future: Teaching Evidence In The Technological Age, Denise H. Wong

Research Collection Yong Pung How School Of Law

The advent of the technological age has had significant effect on litigation practice, none more so than in the area of evidence gathering and presentation in court. A significant proportion of evidence that is gathered for both criminal and civil matters is now electronic in nature, and this necessitates a change in the way that lawyers think and advise on evidential issues. It is argued here that rather than simply focusing on principles relating to the admissibility of evidence in court, the traditional course on evidence law should be modified to equip students with an intellectual framework that conceives of …


Changes In The White-Black House Value Distribution Gap From 1997 To 2005, Eric Fesselmeyer, Kien T. Le, Kiat Ying Seah Jan 2013

Changes In The White-Black House Value Distribution Gap From 1997 To 2005, Eric Fesselmeyer, Kien T. Le, Kiat Ying Seah

Research Collection College of Integrative Studies

This paper examines the white-black house value gap across the entire value distribution. Instead of using standard conditional mean analysis and decomposition methods (via OLS regression), we estimate and decompose the changes in the white-black house value gap from 1997 to 2005 using quantile regression. We find that the racial gap in 1997 and 2005 is mostly explained by differences in housing characteristics of white- and black-owned houses but that the variation in the racial gap is explained by racial differences in implicit prices of housing characteristics. Our results show that analysis at the conditional mean masks variations at the …


Measuring Differentials In Communication Research: Issues With Multicollinearity In Three Methods, Sonny Rosenthal Jan 2013

Measuring Differentials In Communication Research: Issues With Multicollinearity In Three Methods, Sonny Rosenthal

Research Collection College of Integrative Studies

Models of communication processes sometimes require the computation of the difference between two variables. For example, information insufficiency is the difference between what people know and what they think they need to know about an issue, and it can motivate information seeking and processing. Common methods that compute this differential may bias model estimates as a function of the correlation between the differentiated variables and other variables in the model. This article describes Citation the general form of Cohen and Cohen's (1983) analysis of partial variance for computing differentials and analyzes simulated data to contrast that method with two alternative …


Mining Indirect Antagonistic Communities From Social Interactions, Kuan Zhang, David Lo, Ee Peng Lim, Philips Kokoh Prasetyo Jan 2013

Mining Indirect Antagonistic Communities From Social Interactions, Kuan Zhang, David Lo, Ee Peng Lim, Philips Kokoh Prasetyo

Research Collection School Of Computing and Information Systems

Antagonistic communities refer to groups of people with opposite tastes, opinions, and factions within a community. Given a set of interactions among people in a community, we develop a novel pattern mining approach to mine a set of antagonistic communities. In particular, based on a set of user-specified thresholds, we extract a set of pairs of communities that behave in opposite ways with one another. We focus on extracting a compact lossless representation based on the concept of closed patterns to prevent exploding the number of mined antagonistic communities. We also present a variation of the algorithm using a divide …


The Case For A Legislative Amendment Against Accessory Copyright For Grey Market Products: What Can The U.S. Learn From Singapore And Australia, Irene Calboli, Mary Lafrance Jan 2013

The Case For A Legislative Amendment Against Accessory Copyright For Grey Market Products: What Can The U.S. Learn From Singapore And Australia, Irene Calboli, Mary Lafrance

Research Collection Yong Pung How School Of Law

In this article, we suggest that the U.S. Congress could implement a legislative provision prohibiting copyright protection for incidental product features in the context of parallel imports. The U.S.would not be the first country to implement such a provision. In 1994, Singapore pioneered the adoption of a similar provision, which was introduced as an amendment to the SG 1987 Copyright Act. A few years later, in 1998, Australia incorporated a similar amendment to its Aust. Copyright Act 1968. In this article, we analyse in detail the Singapore and Australia provisions and, building upon these provisions, we suggest a specific amendment …


Certainty At Last?: A "New" Framework For Electronic Contracting In Singapore, Eliza Mik Jan 2013

Certainty At Last?: A "New" Framework For Electronic Contracting In Singapore, Eliza Mik

Research Collection Yong Pung How School Of Law

Singapore is the first Asian country to accede to the UNCITRAL Convention on the Use of Electronic Communications in International Contracts (“CUECIC” or “Convention”). Upon accession, the Singaporean Electronic Transactions Act (“ETA” or “Act”) was repealed and re-enacted in a modified version, with effect from 1 July 2010. The modified ETA retains the framework of the original ETA but adds or amends certain provisions dealing with electronic contracting to align domestic e-commerce regulations with the Convention. Accordingly, Singapore is not only the first Asian nation to accede to the CUECIC but also the first nation to implement some of its …


Causation, Remoteness, Scope Of Duty And The Rubenstein Decision, Kee Yang Low Jan 2013

Causation, Remoteness, Scope Of Duty And The Rubenstein Decision, Kee Yang Low

Research Collection Yong Pung How School Of Law

Oftentimes, based on the facts of a case, what justice requires is reasonably clear; yet, when the clever arguments of the defendant’s lawyers have to be dealt with, the Judge faces difficult, even insurmountable obstacles as he seeks the legal justification for the result which he knows (or feels) is the correct one. Rubenstein v HSBC1is such a case. The Rubensteinjudgment is not easy to digest, for several reasons. First, the claims traversed statutory duty, tort of negligence and contract and, along with that, the perennial vexed question of whether different paths should lead to the same result. Second, the …


Moving Object Detection With Laser Scanners, Christoph Mertz, Luis E. Navarro-Serment, Robert Maclachlan, Paul Rybski, Aaron Steinfeld, Arne Suppe, Christopher Urmson, Nicolas Vandapel, Martial Hebert, Chuck Thorpe, David Duggins, Jay Gowdy Jan 2013

Moving Object Detection With Laser Scanners, Christoph Mertz, Luis E. Navarro-Serment, Robert Maclachlan, Paul Rybski, Aaron Steinfeld, Arne Suppe, Christopher Urmson, Nicolas Vandapel, Martial Hebert, Chuck Thorpe, David Duggins, Jay Gowdy

Research Collection School Of Computing and Information Systems

The detection and tracking of moving objects is an essential task in robotics. The CMU-RI Navlab group has developed such a system that uses a laser scanner as its primary sensor. We will describe our algorithm and its use in several applications. Our system worked successfully on indoor and outdoor platforms and with several different kinds and configurations of two-dimensional and three-dimensional laser scanners. The applications vary from collision warning systems, people classification, observing human tracks, and input to a dynamic planner. Several of these systems were evaluated in live field tests and shown to be robust and reliable. (C) …


Seller Diversity On A Technology-Based Platform, Ruhai Wu, Mei Lin Jan 2013

Seller Diversity On A Technology-Based Platform, Ruhai Wu, Mei Lin

Research Collection School Of Computing and Information Systems

Managing a technology portfolio is one of the great challenges for sustained success, especially in high-technology industrieswhere technologies can be a major selling point. For engineers, this portfolio is more of a toolbox for solving design problems,but in large organizations there can be so many technologies used in different business areas that even the engineers may not beaware of all of them. When the same technologies are used in different types of products, knowledge about them can also begenerated by various groups within an organization. To improve the usefulness of a company's technology base, this paperproposes the use of a …