Digital Commons Network^™

Factors Influencing Treatment Patterns In Breast Cancer Patients Age 75 And Over, Arti Hurria, Denis H. Y. Leung, Kathleen Trainor, Patrick Borgen, Larry Norton, Clifford Hudis

Research Collection School Of Economics

To retrospectively determine the factors influencing treatment decisions in older breast cancer patients at a single center. Experimental Design: 216 patients age > or = 75 seen in post-treatment follow-up between January, 1997 and June, 2000 were identified in the Memorial Sloan-Kettering breast cancer database. Eligible patients were > or = 75 years old at diagnosis, had a diagnosis of stage I, II, or III breast cancer, and received their follow-up care at Memorial Sloan Kettering Cancer Center. A retrospective chart review was performed. Patients were stratified by: (1) prognostic factors (age (75-79 or > or = 80), Charlson comorbidity score, tumor size, …

Ts-Pwlan: A Value-Add System For Providing Tiered Wireless Services In Public Hot-Spots, Arup Acharya, Chatschik Bisdikian, Archan Misra, Young-Bae Ko

Research Collection School Of Computing and Information Systems

Access to data services via wireless LANs at private (e.g., corporations or home) and public "hot-spot" (e.g., hotels and airports) setting is becoming a common place daily. Data access via (for profit) public wireless LAN (PWLAN) installations is typically based on user subscription and preconfigured services profiles pertaining primarily access to the global Internet. The goal of the ts-PWLAN project is to define an architecture and a prototype implementation that enables the provision of premium and non-premium tiers of services to transient and non-transient users. ts-PWLAN provides for dynamic renegotiations of tier of services and enables various billing modes, e.g., …

On The Strategy Of Supply Hubs For Cost Reduction And Responsiveness, Earl Barnes, Jim Dai, Shijie Deng, Doug Down, Mark Goh, Hoong Chuin Lau, Sharafali Moosa

Research Collection School Of Computing and Information Systems

A supply hub is a location generally close to a manufacturer’s facility where all or some of its supplies are warehoused with the agreement that the materials will be paid for only when consumed. Supply hub is an innovative strategy employed by especially the electronics industry to achieve cost reduction and improved responsiveness. After first tracing the developments leading to the establishment of supply hubs, the paper then describes the dynamics of the operation of supply hubs. Case examples are provided to highlight the current practices. Finally, some research issues are identified.

On Querying Geospatial And Georeferenced Metadata Resources In Gportal, Zehua Liu, Ee Peng Lim, Wee-Keong Ng, Dion Hoe-Lian Goh

Research Collection School Of Computing and Information Systems

G-Portal is a web portal system providing a range of digital library services to access geospatial and georeferenced resources on the Web. Among them are the storage and query subsystems that provide a central repository of metadata resources organized under different projects. In GPortal, all metadata resources are represented in XML (Extensible Markup Language) and they are compliant to some resource schemas de.ned by their creators. The resource schemas are extended versions of a basic resource schema making it easy to accommodate all kinds of metadata resources while maintaining the portability of resource data. To support queries over the geospatial …

Secure The Image-Based Simulated Telesurgery System, Yanjiang Yang, Zhenlan Wang, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

Telemedicine services involve transmission of patient data over open computer network, and thus confront serious security challenges when the consequences are a matter of life and death. In this paper, we introduce an image-based simulated system for kyphoplasty telesurgery, wherein special attention is given to the fine-grained security implementation issues. Various security requirements are formalized and corresponding solutions are presented. Consequently, we implement the system to work in a secure way, while taking efficiency as a premier consideration.

Tactics-Based Remote Execution For Mobile Computing, Rajesh Krishna Balan, Mahadev Satayanarayana, Soyoung Park, Tadashi Okoshi

Research Collection School Of Computing and Information Systems

Remote execution can transform the puniest mobile device into a computing giant able to run resource-intensive applications such as natural language translation, speech recognition, face recognition, and augmented reality. However, easily partitioning these applications for remote execution while retaining application-specific information has proven to be a difficult challenge. In this paper, we show that automated dynamic repartitioning of mobile applications can be reconciled with the need to exploit application-specific knowledge. We show that the useful knowledge about an application relevant to remote execution can be captured in a compact declarative form calledtactics. Tactics capture the full range of meaningful partitions …

On Machine Learning Methods For Chinese Document Classification, Ji He, Ah-Hwee Tan, Chew-Lim Tan

Research Collection School Of Computing and Information Systems

This paper reports our comparative evaluation of three machine learning methods, namely k Nearest Neighbor (kNN), Support Vector Machines (SVM), and Adaptive Resonance Associative Map (ARAM) for Chinese document categorization. Based on two Chinese corpora, a series of controlled experiments evaluated their learning capabilities and efficiency in mining text classification knowledge. Benchmark experiments showed that their predictive performance were roughly comparable, especially on clean and well organized data sets. While kNN and ARAM yield better performances than SVM on small and clean data sets, SVM and ARAM significantly outperformed kNN on noisy data. Comparing efficiency, kNN was notably more costly …

Parameter Optimization In The Regularized Shannon's Kernels Of Higher-Order Discrete Singular Convolutions, Wei Xiong, Yibao Zhao, Yun Gu

Research Collection Lee Kong Chian School Of Business

The δ-type discrete singular convolution (DSC) algorithm has recently been proposed and applied to solve kinds of partial differential equations (PDEs). With appropriate parameters, particularly the key parameter r in its regularized Shannon's kernel, the DSC algorithm can be more accurate than the pseudospectral method. However, it was previously selected empirically or under constrained inequalities without optimization. In this paper, we present a new energy-minimization method to optimize r for higher-order DSC algorithms. Objective functions are proposed for the DSC algorithm for numerical differentiators of any differential order with any discrete convolution width. Typical optimal parameters are also shown. The …

Commune-Level Poverty Estimates And Ground Truthing, Tomoki Fujii

Research Collection School Of Economics

The United Nations World Food Programme (WFP) Cambodia, in close collaboration with various government institutions, has been conducting poverty analysis and mapping refinement. The main objectives of the refinement have been (i) to refine core poor areas in Cambodia, (ii) to identify priority areas for social sector interventions such as those targeted to adult and child education, health and nutrition interventions, and (iii) to identify priority areas for assisting variable population groups such as those in flood and drought prone areas, forest and fishing concession areas.

Efficient Native Xml Storage System (Enaxs), Khin-Myo Win, Wee-Keong Ng, Ee Peng Lim

Research Collection School Of Computing and Information Systems

XML is a self-describing meta-language and fast emerging as a dominant standard for Web data exchange among various applications. With the tremendous growth of XML documents, an efficient storage system is required to manage them. The conventional databases, which require all data to adhere to an explicitly specified rigid schema, are unable to provide an efficient storage for tree-structured XML documents. A new data model that is specifically designed for XML documents is required. In this paper, we propose a new storage system, named Efficient Native XML Storage System (ENAXS), for large and complex XML documents. ENAXS stores all XML …

Market Structure And Performance: An Anti-Trust Story Of Endogenous Growth, Hing-Man Leung

Research Collection School Of Economics

Since Schumpeter, a major concern has been: what monopoly does to growth? Monopoly’s static, allocative inefficiency is well established. How much this is offset by its dynamic progressiveness is unclear. First, using the empirical literature, we argue that the presumed progressiveness of monopoly must be rejected. Second, we extend the endogenous growth model to obtain a full Pareto ranking of competition, monopoly, Cournot and Bertrand. Competition beats Cournot, which in turn beats monopoly. Growth rate is invariant with structures, which accords well with empirical evidence. Bertrand happens to share the ranking with competition. The findings have a strong anti-trust overtone.

Adaptive Transmission Power For Optimal Energy Reliable Multi-Hop Wireless Communication, Suman Banerjee, Archan Misra

Research Collection School Of Computing and Information Systems

We define a transmission power adaptation-based routing technique that finds optimal paths for minimum energy reliable data transfer in multi-hop wireless networks. This optimal choice of the transmission power depends on the link distance between the two nodes and the channel characteristics. Typical energy efficient routing techniques use a transmission power such that the received signal power at the destination minimally exceeds a desired threshold signal strength level. In this paper we argue that such a choice of the transmission power does not always lead to optimal energy routes, since it does not consider differences in the receiver noise levels. …

Challenging Forensic Evidence? Observations Of The Use Of Dna In Certain Criminal Trials, Mark Findlay, Julia Grix

Research Collection Yong Pung How School Of Law

Our interest in forensic evidence, and in the use of DNA within criminal trials in particular, arises out of our recent responsibility to review the Crimes (Forensic Procedures) Act 2000 in New South Wales. This review engaged various methodologies to enable an understanding of forensic evidence procedures, from investigation through to courtroom practice. Crucially, the review explored the significance of DNA evidence within criminal trials in order to speculate on ways in which such evidence may be received by the trial 'fact-finders' in an appropriate and enlightening manner.

Motion Analysis And Segmentation Through Spatio-Temporal Slices Processing, Chong-Wah Ngo, Ting-Chuen Pong, Hong-Jiang Zhang

Research Collection School Of Computing and Information Systems

This paper presents new approaches in characterizing and segmenting the content of video. These approaches are developed based upon the pattern analysis of spatio-temporal slices. While traditional approaches to motion sequence analysis tend to formulate computational methodologies on two or three adjacent frames, spatio-temporal slices provide rich visual patterns along a larger temporal scale. In this paper, we first describe a motion computation method based on a structure tensor formulation. This method encodes visual patterns of spatio-temporal slices in a tensor histogram, on one hand, characterizing the temporal changes of motion over time, on the other hand, describing the motion …

Maca-P: A Mac For Concurrent Transmissions In Multi-Hop Wireless Networks, Arup Acharya, Archan Misra, Sorav Bansal

Research Collection School Of Computing and Information Systems

This paper presents the initial design and performance study of MACA-P, a RTS/CTS based MAC protocol that enables simultaneous transmissions in multihop ad-hoc wireless networks. Providing such low-cost multihop and high performance wireless access networks is an important enabler of pervasive computing. MACA-P is a set of enhancements to the 802.11 DCF that allows parallel transmissions in many situations when two neighboring nodes are either both receivers or both transmitters, but a receiver and a transmitter are not neighbors. Like 802.11, MACA-P contains a contention-based reservation phase prior to data transmission. However, the data transmission is delayed by a control …

Comparing The Routing Energy Overheads Of Ad-Hoc Routing Protocols, Sorav Bansal, Rajeev Shorey, Archan Misra

Research Collection School Of Computing and Information Systems

We use simulations to study the comparative routing overheads of three ad-hoc routing protocols, namely AODV, DSDV and DSR. In contrast to earlier studies, we focus exclusively on the energy consumption and not on other metrics such as the number of routing packets. In particular, we study the `range effects' of the three protocols, i.e., how changes to the transmission power and transmission radius affect the overall energy consumed by routing-related packets. Due to the broadcast nature of the wireless medium, the energy spent in packet receptions is almost as important as the transmission power; using the number of transmissions …

Energy-Efficient Broadcast And Multicast Trees For Reliable Wireless Communication, Suman Banerjee, Archan Misra, Jihwang Yeo, Ashok Agrawala

Research Collection School Of Computing and Information Systems

We define energy-efficient broadband and multicast schemes for reliable communication in multi-hop wireless networks. Unlike previous techniques, the choice of neighbors in the broadband and multicast trees in these schemes, are based not only on the link distance, but also on the error rates associated with the link. Our schemes can be implemented using both positive and negative acknowledgement based reliable broadcast techniques in the link layer. Through simulations, we show that our scheme achieves up to 45% improvement over previous schemes on realistic 100-node network topologies. A positive acknowledgment based implementation is preferred. Our simulations show that the additional …

Health Care Informatics, Keng Siau

Research Collection School Of Computing and Information Systems

The health care industry is currently experiencing a fundamental change. Health care organizations are reorganizing their processes to reduce costs, be more competitive, and provide better and more personalized customer care. This new business strategy requires health care organizations to implement new technologies, such as Internet applications, enterprise systems, and mobile technologies in order to achieve their desired business changes. This article offers a conceptual model for implementing new information systems, integrating internal data, and linking suppliers and patients.

Hierarchical Text Classification Methods And Their Specification, Ee Peng Lim, Aixin Sun, Wee-Keong Ng

Research Collection School Of Computing and Information Systems

Hierarchical text classification refers to assigning text documents to the categories in a given category tree based on their content. With large number of categories organized as a tree, hierarchical text classification helps users to find information more quickly and accurately. Nevertheless, hierarchical text classification methods in the past have often been constructed in a proprietary manner. The construction steps often involve human efforts and are not completely automated. In this chapter, we therefore propose a specification language known as HCL (Hierarchical Classification Language). HCL is designed to describe a hierarchical classification method including the definition of a category tree …

Stegfs: A Steganographic File System, Hwee Hwa Pang, Kian-Lee Tan, Xuan Zhou

Research Collection School Of Computing and Information Systems

While user access control and encryption can protect valuable data from passive observers, those techniques leave visible ciphertexts that are likely to alert an active adversary to the existence of the data, who can then compel an authorized user to disclose it. This paper introduces StegFS, a steganographic file system that aims to overcome that weakness by offering plausible deniability to owners of protected files. StegFS securely hides user-selected files in a file system so that, without the corresponding access keys, an attacker would not be able to deduce their existence, even if the attacker is thoroughly familiar with the …

Enterprise Integration With Erp And Eai, Jinyoul Lee, Keng Siau, Soongoo Hong

Research Collection School Of Computing and Information Systems

The Integration of enterprise with the ERP (enterprise resource planning) and EAI (enterprise application integration) is discussed. The ERP supports the centralized business strategy while EAI accomodates the decentralized business processes. The changes brought in by the internet technology led the internalization and extrenalization to move together. The agility and the flexibility in the organizations would be achieved by a greater degree of communication, coordination and cooperation in human factors and information technologies. The enterprise integration fulfills the needs of both internal business processes and external customer by internalization and externalization.

The Lion And The Lamb: Demythologizing Franklin Roosevelt's Fireside Chats, Elvin T. Lim

Research Collection School of Social Sciences

We are accustomed to a characterization of Franklin Roosevelt’s legendary Fireside Chats as intimate exchanges between the president and the people. This essay argues that the Fireside Chats were a harsher, more castigatory rhetorical genre than such a characterization would allow. A content analysis of the 27 Fireside Chats recorded in FDR’s Public Papers suggests that the Fireside Chats were, on a number of indices, far less intimate than have traditionally been supposed, and in fact among the more vitriolic and declamatory utterances of the 32nd president. The essay proceeds with a discussion of how this illusion of intimacy was …

Meeting The Software Engineering Challenges Of Adaptive Mobile Applications, Rajesh Krishna Balan, Joao Pedro Sousa, Mahadev Satyanarayanan

Research Collection School Of Computing and Information Systems

A critical factor for the commercial success of mobile and task-specific devices is the fast turnaround time of software development. However, developing software for mobile devices is especially hard since applications need to be aware of and adapt to changing resources such as bandwidth and battery.

Singapore Management University Report To Stakeholders 2003 - 2004, Singapore Management University

Report to Stakeholders

From what started as an idea and then became a blueprint only a few short years ago, SMU has already developed into a university highly regarded for its quality programmes, faculty and students – not only in Singapore, but in the region and beyond.

The so-called ‘SMU experiment’ in Singapore tertiary education has been looked upon with much curiosity and generated great expectations during this time. And this year the University celebrated one of its most significant and anticipated milestones: the graduation of our first batch of students. More than just graduates, these students – now SMU alumni – are …

Developmental Financial Institutions As Technology Policy Instruments: Implications For Innovation And Entrepreneurship In Emerging Economies, Gerard George, Ganesh N. Prabhu

Research Collection Lee Kong Chian School Of Business

Developmental financial institutions (DFIs) in emerging economies regularly assess new technology platforms to support their investments in new ventures, established firms, and technology institutions (TIs). Their financing decisions are guided by national priorities such as achieving technological self-reliance. By providing attractive financing options and related support, DFIs are well placed to consciously channel finance into designated priority technology areas. To better understand DFI roles, we conducted multiple interviews with participants affiliated with DFIs, firms and TIs in India. From data gathered from these interviews and secondary data on DFIs in emerging economies, we develop a preliminary framework to suggest that …

The Integrated Networks Model: Explaining Resource Allocations In Network Markets, Judy K. Frels, Tasadduq Shervani, Rajendra Kumar Srivastava

Research Collection Lee Kong Chian School Of Business

The last decade has witnessed a shift from a focus on the value created by a single firm and product to an examination of the value created by networks of firms (or product ecosystems) in which assets are comingled with external entities. The authors examine these market-based assets in the context of network markets and propose an Integrated Networks model in which three types of networks-user, complements, and producer-add value or enhance the attractiveness of the associated focal product. The authors empirically test the proposed model by surveying information technology professionals on their resource allocation decisions regarding the Unix and …

On Quantitative Evaluation Of Clustering Systems, Ji He, Ah-Hwee Tan, Chew-Lim Tan, Sam-Yuan Sung

Research Collection School Of Computing and Information Systems

Clustering refers to the task of partitioning unlabelled data into meaningful groups (clusters). It is a useful approach in data mining processes for identifying hidden patterns and revealing underlying knowledge from large data collections. The application areas of clustering, to name a few, include image segmentation, information retrieval, document classification, associate rule mining, web usage tracking, and transaction analysis.

Mobile Communications And Mobile Services, Keng Siau, Z. Shen

Research Collection School Of Computing and Information Systems

As wireless technologies evolve, the coming mobile revolution will bring dramatic and fundamental changes to the world. This revolution has already begun and is gaining momentum. The revolution will impact numerous facets of our daily lives and the way business is conducted. It will provide important data in real time to assist decision makers, exert great influence on communications between businesses and their customers, and transform the way we live our lives. This paper examines issues in providing services via wireless technologies, i.e. mobile services. The paper discusses the challenges facing mobile services, such as changes in business strategies, investment …

Enterprise-Wide Strategic Information Systems Planning For Shanghai Bell Corporation, Y. Long, Fiona Fui-Hoon Nah, Z. Zhu

Research Collection School Of Computing and Information Systems

In response to increasing competition and technological advancement, Shanghai Bell Co., Ltd., a leading telecommunications enterprise located in Shanghai, China, carried out a major initiative to develop its next generation Information Technology/Information Systems (IT/IS) strategic plan. The initiative was prompted by limitations of its current enterprise application systems where the systems were neither able to keep up with the evolving needs due to organizational change nor satisfy the increasing demands for information sharing and data analysis. This case describes the environmental and organizational context of Shanghai Bell Corporation, and the problems and challenges it encountered in developing an enterprise-wide strategic …

The Role Of The Eu In The Non-Proliferation Of Nuclear Weapons: The Way To Thessaloniki And Beyond, Clara Portela

Research Collection School of Social Sciences

Over the past few years the EU has begun taking some steps against the spread of nuclear weapons within its Common Foreign and Security Policy (CFSP). At the Thessaloniki Summit June 2003, the European Council adopted its first draft Strategy against the proliferation of Weapons of Mass Destruction (WMD). In order to assess the significance of the Strategy, this paper will first present and evaluate the Union’s record in the field, then review the newly released Strategy, and finally make suggestions as to how it can be improved.

The EU is not an unitary actor in the nuclear non-proliferation domain, …