# Problems

This page will be updated with problem descriptions as they are confirmed.

## Problem 1: Structural Models for Wind Turbines

### Svenn Anton Halvorsen (Teknova), Damir Radan (IRIS)

If you are a registered participant of ESGI 73 you can request a copy of the problem description from hazel dot higgens at warwick dot ac dot uk or the problem is available on ukstudygroup.net (participants not already registered on this site can request to be so).

## Problem 2: Emitter-Platform Association

### Neil Cade (SELEX Galileo Ltd.)

Given Intercepted Radio Frequency (RF) emissions, provide a prediction of the number of underlying source platforms and the association between the emissions and platforms.

## Problem 3: Modelling Hurricane Track Memory

### Trevor Maynard (LLoyd's of London)

Within a hurricane season – is there a tendency, under some conditions, for groups of hurricane tracks to follow a large scale steering pattern? Can the steering pattern be identified in some sense? What is the unconditional probability a steering pattern will exist in a given year? Can this probability be made conditional on large scale climate variables (ENSO etc) with any skill?

## Problem 4: Earthquake Risk: Including Uncertainties in the Ground Motion Calculation

### John Alarcon (AIR Worldwide)

At present uncertainties in GMPEs (Ground Motion Predictive Equations) are not included in any commercial model with worldwide business. Therefore, finding a mathematical way to incorporate the distribution around the mean groundmotions without increasing the already demanding computational effort is the scope of this proposal. A suitable solution would definitively represent a milestone in earthquake catastrophe modelling.

## Problem 5: A Neutrally Stable Virtually Pivoting Chair

### Hilary Birkbeck (61-54 Design)

We all sit in ‘Office Swivel’ chairs, an ‘intuitive’ solution has been developed to make the experience more comfortable (using the occupant’s mass rather than springs) but its effectiveness is difficult to quantify. Can a model be developed to consider what ‘Human’ percentile will receive the same effect as they recline and return to neutral rest; is the current geometric ‘setup’ a true reflection of the forces in play, or could this geometry be altered to achieve a more efficient result?

## Problem 6: Dynamic Line Management

### Nick Kelley, Mike Stevens (TalkTalk)

Whilst ADSL supports error correction, these have an impact on the performance of the line. Using Dynamic Line Management data is collected from a customer’s line, analysed and changes made to move the customer to a more appropriate profile. The approach is typically iterative, so that a number of profile changes are made before the customer’s line is fully optimised.

## Problem 7: Fractal Properties of Soil

### Paul Sweeney (Syngenta)

Models treat soil surface as effectively planar. However it is well-known that soil surface can be treated as a fractal. It is an open question the extent to which degradation via adsorption of photons into a fractal surface differs from that assuming a planar surface and whether this can explain the inability of models to represent the degradation of some substances.