Academic Publications

Each article’s abstract is provided on this page. PDF copies of the publications can be downloaded from an article’s page. If you have any questions, shoot an email.

Invento Robotics: Launching Humanoid Robots

Based in Bengaluru, India, Invento Robotics (Invento) was a start-up that manufactured humanoid robots. In October 2017, Invento received a mandate to develop a humanoid robot to welcome India’s prime minister and the US president’s senior adviser at the Global Entrepreneurship Summit that year in Hyderabad. It was a high-stakes event for Invento; a positive reception to the robots would mean many leads for the company, while a negative response could mar Invento’s reputation. While Invento’s time had hitherto been spent on research and development, there was pressure for it to now determine an overall marketing strategy. It was imperative that Invento quickly crystallize ideas about its customers, product positioning, branding, pricing, distribution channels, and promotions.

June 30, 2021

Dynamic GP: Application to Malaria Vaccine Coverage Prediction

Gaussian process (GP) based statistical surrogates are popular, inexpensive substitutes for emulating the outputs of expensive computer models that simulate real-world phenomena or complex systems. Here, we discuss the evolution of dynamic GP model — a computationally efficient statistical surrogate for a computer simulator with time series outputs. The main idea is to use a convolution of standard GP models, where the weights are guided by a singular value decomposition (SVD) of the response matrix over the time component. The dynamic GP model also adopts a localized modeling approach for building a statistical model for large datasets. In this chapter, we use several popular test function based computer simulators to illustrate the evolution of dynamic GP models. We also use this model for predicting the coverage of Malaria vaccine worldwide. Malaria is still affecting more than eighty countries concentrated in the tropical belt. In 2019 alone, it was the cause of more than 435,000 deaths worldwide. The malice is easy to cure if diagnosed in time, but the common symptoms make it difficult. We focus on a recently discovered reliable vaccine called Mos-Quirix (RTS,S) which is currently going under human trials. With the help of publicly available data on dosages, efficacy, disease incidence and communicability of other vaccines obtained from the World Health Organisation, we predict vaccine coverage for 78 Malaria-prone countries.

December 20, 2020

Statistical Modelling and Analysis of the Computer-Simulated Datasets

Over the last two decades, the science has come a long way from relying on only physical experiments and observations to experimentation using computer simulators. This chapter focuses on the modelling and analysis of data arising from computer simulators. It turns out that traditional statistical metamodels are often not very useful for analyzing such datasets. For deterministic computer simulators, the realizations of Gaussian Process (GP) models are commonly used for fitting a surrogate statistical metamodel of the simulator output. This peer-reviewed book chapter reviews GP models, their numerical stability due to near-singularity of spatial correlation structures. We also presented generalisations of GP model and reviewed algorithms for big data.

January 31, 2019