Collaborating Authors

AI in Business-Process Reengineering

AI Magazine

Business-process reengineering (BPR) is a generic term covering a variety of perspectives on how to change organizations. There are at least two distinct roles for AI in BPR. One role is as an enabling technology for reengineered processes. A second, less common but potentially important role is in tools to support the change process itself.

Gaussian process modulated renewal processes

Neural Information Processing Systems

Renewal processes are generalizations of the Poisson process on the real line, whose intervals are drawn i.i.d. Modulated renewal processes allow these distributions to vary with time, allowing the introduction nonstationarity. In this work, we take a nonparametric Bayesian approach, modeling this nonstationarity with a Gaussian process. Our approach is based on the idea of uniformization, allowing us to draw exact samples from an otherwise intractable distribution. We develop a novel and efficient MCMC sampler for posterior inference.


AAAI Conferences

The goal of the Process Handbook project is to provide a set of theories, methodologies, and tools, to enable the modeling and redesign of organizations in a more systematic way. A key element of the work is a novel approach to representing processes, which uses ideas from computer science about inheritance, and from coordination theory about managing dependencies. This representation improves understanding of complex processes, assists in the identification of process inefficiencies, and facilitates generation and comparative evaluation of alternative processes. We have built an online Process Handbook computer tool based on our approach, to represent, store, classify and manipulate business processes. Using that tool, we have developed the beginnings of a systematic design method for process (re)design.

Sparse Gaussian Process Modulated Hawkes Process Machine Learning

The Hawkes process has been widely applied to modeling self-exciting events, including neuron spikes, earthquakes and tweets. To avoid designing parametric kernel functions and to be able to quantify the prediction confidence, non-parametric Bayesian Hawkes processes have been proposed. However the inference of such models suffers from unscalability or slow convergence. In this paper, we first propose a new non-parametric Bayesian Hawkes process whose triggering kernel is modeled as a squared sparse Gaussian process. Second, we present the variational inference scheme for the model optimization, which has the advantage of linear time complexity by leveraging the stationarity of the triggering kernel. Third, we contribute a tighter lower bound than the evidence lower bound of the marginal likelihood for the model selection. Finally, we exploit synthetic data and large-scale social media data to validate the efficiency of our method and the practical utility of our approximate marginal likelihood. We show that our approach outperforms state-of-the-art non-parametric Bayesian and non-Bayesian methods.


AAAI Conferences

The goal of this paper is to present four key assumptions regarding the measurement of cognitive and metacognitive regulatory processes used during learning with hypermedia. First, we assume it is possible to detect, trace, model, and foster SRL processes during learning with hypermedia. Second, understanding the complex nature of the regulatory processes during learning with hypermedia is critical in determining why certain processes are used throughout a learning task. Third, it is assumed that the use of SRL processes can dynamically change over time and that they are cyclical in nature (influenced by internal and external conditions and feedback mechanisms). Fourth, capturing, identifying, and classifying SRL processes used during learning with hypermedia is a rather challenging task.