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Models for Semantic Interoperability in Service-Oriented Architectures
White Papers Then it analyzes four basic models of semantic interoperability that differ in respect to their mapping between service descriptions and ontologies and in respect to where the evaluation of the integration logic is performed.
[March 29, 2007, 1:00]
IRT-FIT: SAS Macros for Fitting Item Response Theory (IRT) Models
White Papers Psychometrics has recently seen the development of complex measurement models to better represent test and item data. Item Response Theory (IRT), in particular, comprises a set of non-linear latent variable models that appear to have several...
[December 26, 2006, 0:00]
Schedulability Analysis for Rhapsody UML Models
White Papers This webinar explains the reasons for applying timing to real-time UML models. This webcast presents the integration of RapidRMA and Rhapsody to perform Schedulability Analysis for Real-Time architectures.
[February 11, 2005, 23:00]
Transformation of UML Models for Service-Oriented Software Architectures
White Papers The main aim of this paper is to present how to transform user requirements models into a software architecture for mobile applications. The technique (called "4SRS") is essentially based on the mapping of UML use case diagrams into UML object...
[March 21, 2007, 0:00]
The Basic Principles of Building ABM Models
White Papers When starting to build ABM models there are a number of things to consider before plunging into the detail. The paper explains the basic principles of building ABM models. As always, some thought and planning at an early stage will prevent a path...
[August 10, 2006, 0:00]
Protocol Design Beyond Graph-Based Models
White Papers This paper sheds new light on the fundamental gap between graph-based models used by protocol designers and fading channel models used by communication theorists in wireless networks. The paper experimentally demonstrates that graph-based models...
[May 25, 2007, 1:00]
Measurement-Based Models of Delivery and Interference in Static Wireless Networks
White Papers This paper presents practical models for the physical layer behaviors of packet reception and carrier sense with interference in static wireless networks. These models use measurements of a real network rather than abstract RF propagation models as...
[May 23, 2007, 1:00]
Implementing Large-Scale Optimization Models in Excel Using VBA
White Papers The paper shows how using VBA within Excel to generate and solve large Linear Programs (LPs) overcomes many of the problems inherent in purely spreadsheet-based models and greatly increases model usability.
[October 1, 2008, 1:01]
Queueing Models for Analyzing Customer Contact Center Operations
White Papers The authors model the operations of contact centers, where the customer contact is via e-mail and present ongoing research on the development of queueing network models aimed at analyzing the processing of e-mails by a network of customer service...
[July 7, 2006, 0:00]
Fractal Helps Leading Telecom Operator Control Churn by Powering Proactive Retention Programs With Predictive Churn Models
White Papers The challenge therefore was to build churn models that would help the telecom operator identify high-value customers, with a high propensity to churn. A leading telecom operator in one of the largest circles, was faced with the problem of customer...
[May 16, 2009, 1:17]
Social Optimality of Alternative Business Models
White Papers These are then applied to study the social optimality of the main business models in Wireless LAN (WLAN) Hotspot market these days. The paper has the ambitious target to give indication which combination of business models is most likely to produce...
[November 10, 2006, 0:00]
Accuracy Vs. Comprehensibility in Data Mining Models
White Papers A method for rule extraction from opaque models (Genetic Rule EXtraction - G-REX) is used to show the effects on accuracy when forcing the creation of comprehensible representations. This paper addresses the important issue of the tradeoff between...
[September 20, 2008, 0:00]
Vista upgrades: A case of technology hobbled by business models?
Blog We've been hearing other rumblings of odd policies and behaviours with Vista upgrades - almost certainly a case of technology hobbled by business models. As we start to delve into the intruiging world of Vista upgrades, the following email arrives...
[February 6, 2007, 10:22]
Business Process Modeling and Simulation With UML Part I: Defining a UML Transaction Model That Maps to RUP Business Models
White Papers Although the Rational Unified Process (RUP) provides a systematic approach to visually representing a business model, it does not provide a way to derive simulation models that support quantitative comparisons between various improvement options.
[February 14, 2005, 2:00]
Real-World Environment Models for Mobile Network Evaluation
White Papers To produce a real-world environment within which an ad hoc network can be formed among a set of nodes, there is a need for the development of realistic, generic and comprehensive mobility and signal propagation models.
[August 13, 2007, 8:20]
Data Mining Techniques for Building Fault-Proneness Models in Telecom Java Software
White Papers This paper describes a study performed in an industrial setting that attempts to build predictive models to identify parts of a Java system with a high probability of fault. The main focus of this paper is two-fold: use and compare many data mining...
[October 7, 2008, 1:01]
Machine-Learnt Versus Analytical Models of TCP Throughput
White Papers This paper first studies the accuracy of two well-known analytical models of the average throughput of long-term TCP flows, namely the so-called SQRT and PFTK models, and show that these models are far from being accurate in general.
[December 27, 2007, 0:01]
Design and Development of Proactive Models for Mitigating Denial-of-Service and Distributed Denial-of-Service Attacks
White Papers This paper deals with proactive models for mitigating DoS and DDoS attacks. Denial-of-Service (DoS) attacks, orchestrated by a single host or multiple hosts in a coordinated manner, have become an increasingly frequent disturbance in today's Internet.
[October 14, 2008, 1:01]
GLMM_SIM: A SAS Macro for Evaluating the Statistical Integrity of General Linear Mixed Models
White Papers General linear mixed models have the ability to account for nested data overcoming some of the limitations of the more traditional models. Accommodating hierarchical or nested data has historically been problematic for researchers.
[June 2, 2007, 1:00]
A Web Service for Exchanging Procedural CAD Models Between Heterogeneous CAD Systems
White Papers In this paper, the author extends the synchronized collaborative design environment among heterogeneous CAD systems, which is developed previously, to a Web services based platform for exchange of procedural CAD models between heterogeneous CAD...
[March 9, 2007, 0:00]
