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Article
Publication date: 4 January 2011

Bingchang Ni and Constantinos Sourkounis

Wind energy plays a very important role in the future electrical power supply. With growing shares, the focus of the plant control will have to shift from maximum power

Abstract

Purpose

Wind energy plays a very important role in the future electrical power supply. With growing shares, the focus of the plant control will have to shift from maximum power yield to grid friendly aspects, like stable power output despite fluctuating wind power. The purpose of this paper is to design a new operation management for wind energy converters that combines high‐energy yield, grid friendly power output characteristics and the ability to adapt to changing wind conditions.

Design/methodology/approach

An operation control based on stochastic dynamic optimization was developed for the special demands of variable speed wind energy converters. The task of the operation control is to set the appliance to the optimal operation point, following the above‐mentioned goals by adapting the control pattern to changing wind conditions.

Findings

It is shown that the novel control concept, the iterative self‐adapting system management with stochastic dynamic optimization, is able to control wind energy converters in such a way that the effect of the stochastic fluctuating wind energy supply on the output power fluctuation is smoothed while maintaining a high‐energy yield.

Originality/value

This non‐linear stochastic dynamic optimization structure has two special characteristics, first is the iterative self‐adaptation, and second is the optimization for an infinite process, while the optimization criteria are high‐power yield and low‐power output fluctuations. This will be of great value for further increase of wind energy converters in the electrical power supply.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 30 no. 1
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 2 October 2018

Yang Yu, Zhongjie Wang and Chengchao Lu

The purpose of this paper is to propose an extended Kalman particle filter (EPF) approach for dynamic state estimation of synchronous machine using the phasor measurement…

Abstract

Purpose

The purpose of this paper is to propose an extended Kalman particle filter (EPF) approach for dynamic state estimation of synchronous machine using the phasor measurement unit’s measurements.

Design/methodology/approach

EPF combines the extended Kalman filter (EKF) with the particle filter (PF) to accurately estimate the dynamic states of synchronous machine. EKF is used to make particles of PF transfer to the likelihood distribution from the previous distribution. Therefore, the sample impoverishment in the implementation of PF is able to be avoided.

Findings

The proposed method is capable of estimating the dynamic states of synchronous machine with high accuracy. The real-time capability of this method is also acceptable.

Practical implications

The effectiveness of the proposed approach is tested on IEEE 30-bus system.

Originality/value

Introducing EKF into PF, EPF is proposed to estimate the dynamic states of synchronous machine. The accuracy of a dynamic state estimation is increased.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 37 no. 6
Type: Research Article
ISSN: 0332-1649

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Book part
Publication date: 7 September 2012

Sangin Park

This chapter proposes three different definitions for the market power in the antitrust case, such as dynamic monopoly power, static monopoly power and market power.The…

Abstract

This chapter proposes three different definitions for the market power in the antitrust case, such as dynamic monopoly power, static monopoly power and market power.

The chapter presents simple economic models to analyse which definition of the three market powers is consistent with predatory pricing or tying.

The prerequisite market power is simply market power in the predatory pricing case or static monopoly power in the tying case.

Dynamic monopoly power defined as the market power from an antitrust perspective by the Antitrust Modernization Commission should not be the prerequisite market power in the case of the abuse of dominance or the violation of Section 2 of the Sherman Act.

A possession of substantial market power or monopoly power is typically understood as a prerequisite in abuse of dominance in Korea and EU or violation of Section 2 of the Sherman Act in the United States. However, the antitrust law does not clearly indicate the meaning of market power or monopoly power. This chapter proposes three different definitions for the market power in the antitrust case and analyses which definition of the three market powers is consistent with predatory pricing or tying.

Details

Research in Law and Economics
Type: Book
ISBN: 978-1-78052-898-4

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Article
Publication date: 4 December 2017

Sameer Prasad, James Jaffe, Kuntal Bhattacharyya, Jasmine Tata and Donna Marshall

Billions of entrepreneurs at the Base of the Pyramid (BoP) operate as small-scale producers within multi-tiered supply chain networks. Unfortunately, a majority of these…

Abstract

Purpose

Billions of entrepreneurs at the Base of the Pyramid (BoP) operate as small-scale producers within multi-tiered supply chain networks. Unfortunately, a majority of these entrepreneurs are simply unable to derive sufficient value from the network and are vulnerable to disasters and poverty. The purpose of this paper is to develop a typology that examines dynamic and triadic power relationships in order to create value chains for BoP producers.

Design/methodology/approach

This paper builds upon the available literature and a relevant historical case study to develop a typology. The validity of the typology is ascertained by examining and comparing two current BoP silk weaver communities in India.

Findings

The typology captures essential environmental variables and relates them to mediated and non-mediated forms of power which, in turn, shape the value derived from the supply chain network.

Practical implications

The typology provides specific recommendations for BoP producers, such as the formation of cooperatives, engaging in political unionization and ensuring that their social networks expand beyond local communities.

Originality/value

The typology brings together structuration theory and power and provides a framework for understanding supply value. This typology is generalizable to dynamic multi-tiered supply chain networks.

Details

Journal of Humanitarian Logistics and Supply Chain Management, vol. 7 no. 3
Type: Research Article
ISSN: 2042-6747

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Article
Publication date: 14 September 2015

Andrew Cox

The paper aims to present the case for a “paradigm shift” in current thinking about how to undertake category management and develop sourcing strategies using power

Abstract

Purpose

The paper aims to present the case for a “paradigm shift” in current thinking about how to undertake category management and develop sourcing strategies using power positioning techniques. The case is made based on the growing evidence of a mismatch between currently dominant academic and consulting methodologies and the reality of professional managerial practice.

Design/methodology/approach

The paper provides a critique of the currently dominant thinking about how to conduct category management and strategic sourcing using the Kraljic Purchasing Portfolio Analysis methodology and the more recent Purchasing Chessboard approach. The critique focuses on their lack of analytical rigour when segmenting categories of supply, and their lack of robustness when making practical recommendations for managers when developing sourcing strategies.

Findings

The paper demonstrates how (building on the initial power positioning approach outlined, but not fully developed, by Kraljic) a new approach to portfolio analysis can be developed. Sourcing Portfolio Analysis identifies over 30 strategic sourcing strategies for managers to utilise. Using a simple case study, the power of this new methodology to provide managers with more comprehensive and effective sourcing strategies is demonstrated.

Research limitations/implications

Because of the power of this new approach, and the need to challenge existing methodologies, researchers are encouraged to utilise it and try help to generate a “paradigm shift” in current thinking within the profession.

Practical implications

The paper provides the basis for a future more strategic supply management, rather than the currently tactical spend management, approach to sourcing.

Originality/value

This paper provides a new approach to portfolio analysis.

Details

Supply Chain Management: An International Journal, vol. 20 no. 6
Type: Research Article
ISSN: 1359-8546

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Article
Publication date: 15 October 2020

Bishwajeet Pandey, Geetam Singh Tomar, Robin Singh Bhadoria, Dil Muhammad Akbar Hussain and Ciro Rodriguez Rodriguez

The Purpose of this research is to make an energy efficient finite state machine (FSM) in order to achieve the core objective of green computing because FSM is an…

Abstract

Purpose

The Purpose of this research is to make an energy efficient finite state machine (FSM) in order to achieve the core objective of green computing because FSM is an indispensable part of multiple computer hardware.

Design/methodology/approach

This study uses ultra-scale plus FPGA architecture in place of seven-series field-programmable gate array (FPGA) for the implementation of the FSM design and also uses output load scaling for the design of environment-friendly FSM. This design study is done using Verilog Hardware description language and Vivado integrated system environment design tools and implemented on 16 nm ultra-scale FPGA architecture.

Findings

There is up to 98.57% reduction in dynamic power when operating frequency is managed as per smart job scheduling. There is up to a 21.97% reduction in static power with proper management of output load capacitance. There is up to 98.43% saving in dynamic power with the proposed management of output load capacitance.

Originality/value

The proposed design will be environment friendly that eventually leads to the green earth. This is the main motive of the research area i.e. green computing.

Details

World Journal of Engineering, vol. 18 no. 4
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 25 July 2019

Shuyan Zhao, Hao Chen, Rui Nie and Jinfu Liu

This paper aims to propose a double-sided switched reluctance linxear generator (DSRLG) exclusively for wave power generation. The initial dimensions are given through…

Abstract

Purpose

This paper aims to propose a double-sided switched reluctance linxear generator (DSRLG) exclusively for wave power generation. The initial dimensions are given through design experience and principles. To ameliorate comprehensive performance of the DSRLG, the multi-objective optimization design is processed.

Design/methodology/approach

The multi-objective optimization design of the DSRLG is processed by adopting a modified entropy technique for order of preference by similarity to ideal solution (TOPSIS) algorithm. First, sensitivity analyzes on geometric parameters of the DSRLG are conducted to determine several pivotal geometric parameters as optimization variables. Then, the multi-objective optimization is conducted on the basis of initial dimensions. After determination of synthetical evaluation value of each structure parameter, the best dimension scheme of the DSRLG is concluded.

Findings

After verification by finite element method simulation and dynamic simulation, the final dimension scheme proves to perform better than the initial scheme. Finally, experiments are conducted to verify the accuracy of both the stable finite element DSRLG model and dynamic simulation system model so that the conclusion of this paper proves to be reliable and compelling.

Originality/value

This paper proposes an improved structure of the DSRLG, which is superior for wave power generation. Meanwhile, a novel modified entropy TOPSIS algorithm is applied to the field of electrical machine multi-objective optimal design for the first time.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 38 no. 6
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 January 2006

Brajesh Kumar Kaushik, S. Sarkar and R.P. Agarwal

The performance of a high‐speed chip is highly dependent on the interconnects, which connect different macro cells within a VLSI chip. Delay, power dissipation and…

Abstract

Purpose

The performance of a high‐speed chip is highly dependent on the interconnects, which connect different macro cells within a VLSI chip. Delay, power dissipation and cross‐talk are the major design constraints for high performance VLSI interconnects. The importance of on‐chip inductance is continuously increasing with higher clock frequency, faster on‐chip rise time, wider wires, ever‐growing length of interconnects and introduction of new materials for low resistance interconnects. In the current scenario, interconnect is modeled as an RLC transmission line. Interconnect width optimization plays an important role in deciding transition delay and power dissipation. This paper aims to optimize interconnect width for a matched condition to reduce power and delay parameters.

Design/methodology/approach

Width optimization is done for two sets of interconnect terminating conditions, namely active gate and passive capacitance. SPICE simulations have been used to validate the findings.

Findings

For a driver interconnect load model terminated by an active gate load, a trade‐off exists between short circuit and dynamic power in inductive interconnects, since with wider lines dynamic power increases, but short circuit power of the load gate decreases due to reduced transient delay. Whereas, for a line terminated by a capacitor, such trade‐off does not exist. Many of the previous researches have modeled the active gate load at the terminating end by its input parasitic gate capacitance.

Practical implications

This paper shows that such modeling leads to inaccuracy in estimation of power, and therefore non‐optimal width selection, especially for large fan‐out conditions.

Originality/value

The finding is that the impedance matching between transmission line at driver and load ends plays an important role in estimation of overall power dissipation and transition delay of a VLSI circuit.

Details

Microelectronics International, vol. 23 no. 1
Type: Research Article
ISSN: 1356-5362

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Article
Publication date: 11 October 2019

Mohsen Shafie Nikabadi and Delshad Hoseini

The production of a good or service requires that the supplier performs a wide range of activities. Many companies are trying to fit outsourcing with the dimensions of…

Abstract

Purpose

The production of a good or service requires that the supplier performs a wide range of activities. Many companies are trying to fit outsourcing with the dimensions of their organization. Outsourcing is increasingly being used among Iranian companies in the field of the electric power industry. Human resources are among the factors that consider outsourcing as an obstacle for their growth because staffs declare that the development of outsourcing is a serious threat for unemployment of them and ultimately expulsion from work. Thus, this study surveys the dynamic effects of human resources and work experience on outsourcing decisions. This paper aims to propose a model for dynamic strategic outsourcing focusing on human resource and work experience.

Design/methodology/approach

Presenting a model for strategic outsourcing can help organizations to resolve their outsourcing problems. The data needed for examining the dynamic impact of human resources and work experience on outsourcing have been compiled using library and field studies. The method used in this study is an integrated approach, so the model could consider the general effects of manpower and present a systematic view. After interviewing with experts in power industry, the causal relationships of the variables were determined, and a dynamic model based on the applications of the dynamic system was developed in VENSIM software. The research model will be completed in a three-year period (2016-2019) in the power industry of Iran.

Findings

For completing projects in an organization, cooperation between internal employees and external contractors is needed; thus, results based on both external contractors and internal staff have shown that outsourcing through working of a number of contractors will be more effective than frequent use of one contractor. On the other hand, improving the quality of projects could be done by training new employees using skilled and expert employees.

Originality/value

Existence of one-dimensional models (only with qualitative factors or only with quantitative factors) in the context of outsourcing in the past studies has prompted to study different types of factors together as a dynamic model. This paper presents a quantitative and qualitative model in the field of strategic outsourcing with emphasis on human resources and work experience. In the past studies, there was no way to formulate the qualitative factors, and they simply used the data from the organization, and the only formulation in their works was based on quantitative factors. But in this study, both factors with dynamic modeling have been formulated.

Details

Kybernetes, vol. 49 no. 9
Type: Research Article
ISSN: 0368-492X

Keywords

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Article
Publication date: 1 September 2006

Y.H. Chan, C.C. Lim, K.T. Lau and S.H. Foo

To show new design methodology of low power circuit design (Low Power Critical Voltage Transition Logic – LPCVTL) over the conventional CVTL methodology. The comparison is…

Abstract

Purpose

To show new design methodology of low power circuit design (Low Power Critical Voltage Transition Logic – LPCVTL) over the conventional CVTL methodology. The comparison is in terms of speed, area and power consumption.

Design/methodology/approach

The new design employs feedback mechanism with a different clocking methodology to overcome high static power dissipation of conventional CVTL design.

Findings

LPCVTL has lower power dissipation property as compared to the conventional CVTL design through the observation of the simulated results of an inverter chain and half adder designs. LPCVTL power dissipation is about eight times smaller than the conventional CVTL.

Research limitation/implications

The desired clock frequency is limited by the output signal response.

Originality/value

LPCVTL is an alternative to dynamic digital IC design methodology which has high speed advantage while maintaining low power consumption.

Details

Microelectronics International, vol. 23 no. 3
Type: Research Article
ISSN: 1356-5362

Keywords

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