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Article
Publication date: 5 January 2010

Alon Kuperman, Yoram Horen, Saad Tapuchi, Inna Katz and Alexander Abramovitz

The purpose of this paper is to present a method to compensate slow varying disturbances and plant parameter drifts using a simple yet robust algorithm called input‐output…

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Abstract

Purpose

The purpose of this paper is to present a method to compensate slow varying disturbances and plant parameter drifts using a simple yet robust algorithm called input‐output nominalization.

Design/methodology/approach

In case of known uncertainties, an analytical expression of pre‐computed feed‐forward compensation command is derived. In presence of unknown disturbances and parameter drifts, the control algorithm uses a proportional‐integrative estimator‐based nominalizer. It creates a nominalizing signal, reflecting the deviation of the system from its nominal form using plant input and output. The signal is subtracted from the nominal controller output to cancel the uncertainty and disturbances effects.

Findings

As a result, the uncertain plant and the nominalizer quickly converge to the nominal plant. Therefore, a simple controller tuned according to the nominal plant can be used despite the disturbances and parameter drifts and a nominal response is always obtained. Simulation and experimental results are given to describe the control algorithm performance and inherent limitations.

Research limitations/implications

The proposed method is suitable for linear systems with low frequency uncertainties and disturbances only.

Practical implications

The technique allows compensating errors in plant parameter identifications as well as parameter drifts during plant operations. Constant and slow varying disturbances are also rejected, allowing obtaining a prescribed nominal response.

Originality/value

The proposed approach is different from the common robust control methods to the uncertain linear systems control. Instead of designing a robust controller, efforts are concentrated on the plant input‐output nominalization in a fashion similar to input‐output linearization. The method allows compensating slow varying disturbances and plant parameter drifts using a simple algorithm leading to a simple controller tuned according to the nominal plant parameters.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 29 no. 1
Type: Research Article
ISSN: 0332-1649

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Book part
Publication date: 19 February 2025

Inna Skriabina

In this study the effect of the level of economic development on inequality is estimated. The goal is to determine whether the classical Kuznets curve hypothesis (1955) is…

Abstract

In this study the effect of the level of economic development on inequality is estimated. The goal is to determine whether the classical Kuznets curve hypothesis (1955) is applicable to Russia. The idea of Kuznets was that income inequality first rises with economic growth on the low stages of development and then falls as the economy matures. The empirical evidence of the curve applicable for the Russian regions has been found. The reverse casualty problem by using internal and external instruments has been also taken into the consideration. For the internal instruments, the System GMM method, which implies two functions – one in first difference and the other one in levels, has been used. For the external instruments, the net oil export per capita and trade per capita as instruments have been applied. If the quadratic term is not implied, the estimations show a significant robust positive effect of economic development on inequality. Thus, it is assumed that it happens due to the fact that Russia is still on the first upbeat of the curve, and it has not yet reached sufficient levels of development to tear down inequality.

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Book part
Publication date: 18 November 2024

Maria Magdalena Doroiman and Nicoleta Sîrghi

Purpose: The economies of the European Union (EU) countries are significantly affected by new developments in technology and digital transformations, requiring tailored policies

Abstract

Purpose: The economies of the European Union (EU) countries are significantly affected by new developments in technology and digital transformations, requiring tailored policies to bridge gaps and boost economic development. This chapter analyses the impact of the digital economy in EU countries according to the level of economic growth.

Need for study: Assessing the interaction between economic growth and digitalisation, focussing on digital transformations, digital skills, and economic growth, this chapter designs advanced theoretical and empirical research by building on certain important research issues.

Methodology: The research framework relies on assessing the correlation between the Digital Economy and Society Index (DESI) and economic growth. Based on Eurostat data, this research employs panel econometric models to uncover causal relationships between digital policies and economic growth, incorporating macroeconomic variables and country-specific digital policies. The models are designed through the panel-corrected standard errors (PCSEs) method and robust regression with Huber iteration (RRHI) to ensure unbiased and robust estimates.

Findings: Main findings include that digitalisation coordinates and digital skills are essential for improving economic development in the EU, with benefits for economic growth. These advances affect balance and overall performance and can support policymakers in strengthening their understanding of this scientific field.

Practical implications: The degree of development and the underlying technology underlying determine how the digital economy affects economic growth. Decision-makers can utilise these results to improve digital policies within the EU, favourably impacting the economic development of EU member states.

Details

Economic Development and Resilience by EU Member States
Type: Book
ISBN: 978-1-83797-998-1

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Book part
Publication date: 19 October 2021

Christina Weis

Abstract

Details

Surrogacy in Russia
Type: Book
ISBN: 978-1-83982-896-6

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Article
Publication date: 15 February 2016

Susan E. Reid

The purpose of this paper is to challenge Cold War binaries, seeking a more nuanced understanding of popular experience of change in the Soviet Union’s last decades. This was a…

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Abstract

Purpose

The purpose of this paper is to challenge Cold War binaries, seeking a more nuanced understanding of popular experience of change in the Soviet Union’s last decades. This was a period of intensive modernization and rapid transformation in Soviet citizens’ everyday material environment, marked by the mass move to newly constructed housing and by changing relations with goods.

Design/methodology/approach

To probe popular experience and changing meanings, the paper turns to qualitative, subjective sources, drawing on oral history interviews (Everyday Aesthetics in the Modern Soviet Flat, 2004-2007).

Findings

The paper finds that qualitative changes took place in Soviet popular consumer culture during the 1960s-1970s, as millions of people made home in new housing amid the widespread media circulation of authoritative images representing a desirable modern lifestyle and modernist aesthetic. Soviet people began to make aesthetic or semiotic distinctions between functionally identical goods and were concerned to find the right furniture to fit a desired lifestyle, aesthetic ideal and sense of self.

Research limitations/implications

The problem is how to conceptualize the trajectory of change in ways that do justice to historical subjects’ experience and narratives, while avoiding uncritically reproducing Cold War binaries or perpetuating the normative status claimed by the postwar West in defining modernity and consumer culture.

Originality/value

The paper challenges dominant Cold War narratives, according to which Soviet popular relations with goods were encompassed by shortage and necessity. It advances understanding of the specific form of modern consumer culture, which, it argues, took shape in the USSR after Stalin.

Details

Journal of Historical Research in Marketing, vol. 8 no. 1
Type: Research Article
ISSN: 1755-750X

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