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Cross-matching with interpreted warping of 3D streamer and 3D ocean-bottom-cable data at Valhall for time-lapse assessment

Legacy streamer data and newer 3D ocean-bottom-cable data are cross-matched and analysed for time-lapse analysis of geomechanical changes due to production in the Valhall Field. The issues relating to time-lapse analysis using two such distinctly different data sets are addressed to provide an optimal cross-matching workflow that includes 3D warping. Additionally an assessment of the differences b

Automatic Tuning of Simple Regulators

This paper proposes methods for automatic tuning of slmple regulators. The methods are robust and they require little apriori knowledge about the process. The paper presents the Ideas behind the methods and analysis. Apart from being useful In themselves, the methods will also give a solution to the longstanding problem of safe Initialization of more sophisticated adaptive controllers.

Decision Support for Extreme Programming Introduction and Practice Selection

This paper presents an investigation concerning the introduction of Extreme Programming (XP) in software development organisations. More specifically the concept of using a decision support method known as the Analytical Hierarchy Process (AHP) is evaluated by a group of students and a group of developers and the outcome is compared to experiences from an XP case study. The results provide an indi

On the Kalman-Yakubovich-Popov Lemma for Positive Systems

An extended Kalman-Yakubovich-Popov (KYP) Lemma for positive systems is derived. The main difference compared to earlier versions is that non-strict inequalities are treated. Matrix assumptions are also less restrictive. Moreover, a new equivalence is introduced in terms of linear programming rather than semi-definite programming. As a complement to the KYP lemma, it is also proved that a symmetri