Search results

1 – 10 of 15
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 19 August 2013

Jia LIU, Yumin Zhang, Lei Guo and Xiaoying Gao

A full-order multi-objective anti-disturbance robust filter for SINS/GPS navigation systems with multiple disturbances is designed. Generally, the unmodeled dynamics, the external…

345

Abstract

Purpose

A full-order multi-objective anti-disturbance robust filter for SINS/GPS navigation systems with multiple disturbances is designed. Generally, the unmodeled dynamics, the external environmental disturbance and the inertial apparatus random drift may exist simultaneously in an integrated navigation system, which can be classified into three type of disturbances, that is, the Gaussian noise, the norm bounded noise and the time correlated noise. In most classical studies, the disturbances in integrated navigation systems are classified as Gaussian noises or norm bounded noises, where the Kalman filtering or robust filtering can be employed, respectively. While it is not true actually, such assumptions may lead to conservative results. The paper aims to discuss these issues.

Design/methodology/approach

The Gaussian noises, the norm bounded noises and the time correlated noises in the integrated navigation system are considered simultaneously in this contribution. As a result, the time correlated noises are augmented as a part of system state of the integrated navigation system error model, the relative integrated navigation problem can be transformed into a full-order multi-objective robust filter design problem for systems with Gaussian noises and norm bounded disturbances. Certainly, the errors of the time correlated noises are estimated and compensated for high precision navigation purpose. Sufficient conditions for the existence of the proposed filter are presented in terms of linear matrix inequalities (LMIs) such that the system stability is guaranteed and the disturbance attenuation performance is achieved.

Findings

Simulations for SINS/GPS integrated navigation system given show that the proposed full-order multi-objective anti-disturbance filter, has stronger robustness and better precision when multiple disturbances exist, that is, the present algorithm not only can suppression the effect of white noises and norm bounded disturbance but also can estimate and compensate the modeled disturbance.

Originality/value

The proposed algorithm has stronger anti-disturbance ability for integrated navigation with multiple disturbances. In fact, there exist multiple disturbances in integrated navigation system, so the proposed scheme has important significance in applications.

Details

International Journal of Intelligent Computing and Cybernetics, vol. 6 no. 3
Type: Research Article
ISSN: 1756-378X

Keywords

Access Restricted. View access options
Article
Publication date: 3 January 2017

Sanjeev Shrivastava and Shrivastava R.L.

The purpose of this paper is to survey the technical performance of the cement industry including those related to procedures; groundwork of raw materials, fuels and semi-finished…

2002

Abstract

Purpose

The purpose of this paper is to survey the technical performance of the cement industry including those related to procedures; groundwork of raw materials, fuels and semi-finished products for processing; accessibility of machinery, plant and equipment for various operations; arrangement and process control management.

Design/methodology/approach

A broad range of survey and research was reviewed, and all revealed the methods to recognize the key influences for development of green technology. The study explores the present scenario of green manufacturing (GM) strategies of Indian cement companies and provides the industrial ecology, ways of reducing energy consumption, environmental impact data collection, design and control of manufacturing systems and integration of product and manufacturing system. It also reveals the problems in decision-making systems owing to the impact of the green product design. Here, in this paper, all information is obtained by the medium of internet, journals, articles, and magazines.

Findings

This paper describes a problem of global warming, gas, water and other wastages emissions at the time of cement manufacturing and put forward a path that enables decision makers to assess the perception of GM in their organization and in prioritizing GM efforts.

Originality/value

This perspective survey is to provide an integrative outlook of performance methods for GM practices in the Indian cement industries. It gives important information, which expectantly will help in cement industry to adopt GM practices. This paper fills the gap in the literature on identification, establishment, and validation of performance measures of GM for Indian cement industries.

Details

International Journal of Quality & Reliability Management, vol. 34 no. 1
Type: Research Article
ISSN: 0265-671X

Keywords

Access Restricted. View access options
Article
Publication date: 15 February 2024

Yumin He, Tingyun Gu, Bowen Li, Yu Wang, Dongyuan Qiu, Yang Zhang and Peicheng Qiu

Electric spring (ES) is a demand response method that can stabilize the voltage of critical loads and improve power quality, especially in a weak power grid with a high proportion…

73

Abstract

Purpose

Electric spring (ES) is a demand response method that can stabilize the voltage of critical loads and improve power quality, especially in a weak power grid with a high proportion of renewable energy sources. Most of existing ESs are implemented by voltage-source inverter (VSI), which has some shortcomings. For example, the DC-link capacitor limits the service life of ES, and the battery is costly and hard to recycle. Besides, conventional VSI cannot boost the voltage, which limits the application of ES in high-voltage occasions. This study aims to propose a novel scheme of ES to solve the above problems.

Design/methodology/approach

In this work, an ES topology based on current-source inverter (CSI) without a battery is presented, and a direct current control strategy is proposed. The operating principles, voltage regulation range and parameter design of the proposed ES are discussed in detail.

Findings

The proposed ES is applicable to various voltage levels, and the harmonics are effectively suppressed, which have been validated via the experimental results in both ideal and distorted grid conditions.

Originality/value

An ES topology based on battery-less CSI is proposed for the first time, which reduces the cost and prolongs the service time of ES. A novel control strategy is proposed to realize the functions of voltage regulation and harmonic suppression.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 43 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Access Restricted. View access options
Article
Publication date: 8 April 2022

Yumin Qiu and Hongquan Chen

The large scale of construction projects and the coexistence of multiple logics in the construction field are sparking interest in applying an institutional perspective to…

1233

Abstract

Purpose

The large scale of construction projects and the coexistence of multiple logics in the construction field are sparking interest in applying an institutional perspective to investigate managerial issues in construction projects. However, only a few conceptual papers have been published thus far, and a literature review is needed to identify how that knowledge domain has developed. Based on the results of bibliometric analysis and content analysis, this study proposes potential future avenues for institutional theory in construction project management (ITCPM) studies.

Design/methodology/approach

This paper reports a bibliographic coupling analysis and a co-citation analysis conducted to identify existing research trajectories and determine the primary features of the current ITCPM literature. In addition, this paper employed a content analysis, identified the evolutionary stages of ITCPM knowledge over time and built a framework of existing research.

Findings

This paper first identified that the existing ITCPM studies evolve through three stages, and that the intellectual core of ITCPM studies can be categorized into five clusters. In addition, this paper proposes that future research can be extended from two existing streams: the institutional responses of project actors and the institutional outcomes of construction projects. This paper proposes several major questions that should be addressed by project management scholars working in both streams in order to develop an understanding of construction projects from an institutional perspective.

Originality/value

This is the first literature review of the existing body of knowledge based on a joining of institutional theory and construction project management literature. It uncovers knowledge gaps in contemporary research, notably a lack of broader consideration of how project actors respond to institutional environments and of the institutional outcomes of project management.

Details

Engineering, Construction and Architectural Management, vol. 30 no. 6
Type: Research Article
ISSN: 0969-9988

Keywords

Access Restricted. View access options
Article
Publication date: 21 August 2001

Xu Jichao, Liu Yumin and Zhang Li

As we know, the quality of processes is technically depicted by variation, a product or process with the best quality must naturally require the variation as less as possible. The…

105

Abstract

As we know, the quality of processes is technically depicted by variation, a product or process with the best quality must naturally require the variation as less as possible. The variation is usually reduced with many ways, say, by adjusting parameters settings under robust design with many turns expensive experiements. So ones are trying to reach the robusiness by detecting cheap and simple methods. In this paper, a both practical and simple technique for quality improvement, namely reducing the variation, by data classification is studied. First, all possible system factors are included, which may dominate the variation law. And then we make use of the past observations and their classification as well as boxplot charts to find out the internal rule between the variation and the system factor. Next, adjust the location of the system factor according to the rule so that the variation could, to some extent, be lessened. Finally, two typical quality improvement cases based on data classification are presented.

Details

Asian Journal on Quality, vol. 2 no. 2
Type: Research Article
ISSN: 1598-2688

Keywords

Access Restricted. View access options
Article
Publication date: 26 August 2014

Jinxia Wang, Jikun Huang, Lijuan Zhang and Yumin Li

The purpose of this paper is to explore the impacts of climate change on crop net revenue by region. Particularly, the authors focus on the impact differences between north and…

560

Abstract

Purpose

The purpose of this paper is to explore the impacts of climate change on crop net revenue by region. Particularly, the authors focus on the impact differences between north and south regions.

Design/methodology/approach

The authors applied the Ricardian approach which assumes that each farmer wishes to maximize revenue subject to the exogenous conditions of their farm. The climate data are based on actual measurements in 753 national meteorological stations and the socio-economic data covers 8,405 farms across 28 provinces in China.

Findings

On average, the rise of annual temperature will hurt farms both in the north or south. The impacts of climate change on both precipitation and temperatures have different seasonal impacts on producers in the north and the south of China. As a consequence, the impact on net farm revenues varies with farms in the north and the south being adversely affected (to different degrees) by a rise in the temperature, but both benefiting from an anticipated increase in rainfall. The results also reveal that irrigation is one key adaption measure to dealing with climate change. Whether in the north or south of China, increasing temperature is beneficial to irrigated farms, while for rainfed farms, higher temperature will result in a reduction in net revenues. The results also reveal that farms in the north are more vulnerable to temperature and precipitation variation than that in the south. Irrigated farms in the south are more vulnerable to precipitation variation than that in the north; but rainfed farms in the north are more vulnerable to precipitation variation than that in the south.

Originality/value

Applying empirical analysis to identify the differences of climate change impacts between north and south regions will help policy makers to design reasonable adaptation policies for various regions.

Details

China Agricultural Economic Review, vol. 6 no. 3
Type: Research Article
ISSN: 1756-137X

Keywords

Available. Content available
Book part
Publication date: 30 December 2011

Abstract

Details

The Impact and Transformation of Education Policy in China
Type: Book
ISBN: 978-1-78052-186-2

Access Restricted. View access options
Book part
Publication date: 30 December 2011

Tiedan Huang and Alexander W. Wiseman

Tingting Qi's chapter titled, “Moving toward Decentralization? Changing Education Governance in China After 1985,” provides the historical and policy context for the volume. This…

Abstract

Tingting Qi's chapter titled, “Moving toward Decentralization? Changing Education Governance in China After 1985,” provides the historical and policy context for the volume. This chapter integrates the post-1978 Chinese educational reforms into the socioeconomic context of China. The special contribution of this chapter is that it explores the complexity of educational decentralization in China through an in-depth analysis of changes in education finance, administration, and curriculum. Qi reviews prior studies, government documents, laws, and regulations related to Chinese education reform since 1978 within the context of education decentralization in China. Qi also demonstrates that China's educational policy reforms are moving China toward “centralized decentralization” because decentralization is driven by a common, centralized national goal of economic modernization. The chapter presents evidence that “centralized decentralization” is a strategic maneuver that maintains centralized control while providing the reform legitimacy of decentralization. By focusing on decentralization as the core of Chinese educational policy reforms, this chapter situates the following chapters within the social, cultural, and political context of post-1978 China.

Details

The Impact and Transformation of Education Policy in China
Type: Book
ISBN: 978-1-78052-186-2

Access Restricted. View access options
Article
Publication date: 1 April 2006

Jenny Clegg

The paper sets out to consider the impact of China's reform dynamics on its cooperative economy, examining developments both within the statist sector and beyond, in the variety…

2829

Abstract

Purpose

The paper sets out to consider the impact of China's reform dynamics on its cooperative economy, examining developments both within the statist sector and beyond, in the variety of experimental quasi‐cooperative forms that have grown between plan and market.

Design/methodology/approach

The paper employs a field study approach, examining the roles of farmers' specialised cooperatives within the agro‐industrial chain with experiments in Shandong province.

Findings

The paper shows that reforms in the cooperative economy have been gradual, uneven and jerky, favouring the more entrepreneurial or better‐placed farmers to pursue new market opportunities. Creating a sustainable mechanism that would protect and even enhance the interests of the poorer farmers is proving to be far more difficult.

Research limitations/implications

The field study of this paper covers just one region. A further investigation of the impact that the reform dynamics has on the cooperative economy is planned for the near future.

Practical implications

China's approach has favoured experimentation, encouraging initiatives from below and developing a more flexible relationship between government and farmers. This broad bottom‐up approach has allowed for a diversity of models adapted to local conditions, but has also led to uncertainties about the limits of local government influence and the extent of autonomy, with many cooperatives taking an investor‐oriented direction.

Originality/value

The paper adopts a broader social economy perspective that offers a fruitful way to evaluate developments and consider the future for China's cooperative economy.

Details

Journal of Small Business and Enterprise Development, vol. 13 no. 2
Type: Research Article
ISSN: 1462-6004

Keywords

Access Restricted. View access options
Article
Publication date: 10 October 2022

Teng Wang, Xiaofeng Hu and Yahui Zhang

Steam turbine final assembly is a dynamic process, in which various interference events occur frequently. Currently, data transmission relies on oral presentation, while…

177

Abstract

Purpose

Steam turbine final assembly is a dynamic process, in which various interference events occur frequently. Currently, data transmission relies on oral presentation, while scheduling depends on the manual experience of managers. This mode has low information transmission efficiency and is difficult to timely respond to emergencies. Besides, it is difficult to consider various factors when manually adjusting the plan, which reduces assembly efficiency. The purpose of this paper is to propose a knowledge-based real-time scheduling system under cyber-physical system (CPS) environment which can improve the assembly efficiency of steam turbines.

Design/methodology/approach

First, an Internet of Things based CPS framework is proposed to achieve real-time monitoring of turbine assembly and improve the efficiency of information transmission. Second, a knowledge-based real-time scheduling system consisting of three modules is designed to replace manual experience for steam turbine assembly scheduling.

Findings

Experiments show that the scheduling results of the knowledge-based scheduling system outperform heuristic algorithms based on priority rules. Compared with manual scheduling, the delay time is reduced by 43.9%.

Originality/value

A knowledge-based real-time scheduling system under CPS environment is proposed to improve the assembly efficiency of steam turbines. This paper provides a reference paradigm for the application of the knowledge-based system and CPS in the assembly control of labor-intensive engineering-to-order products.

Details

Assembly Automation, vol. 42 no. 5
Type: Research Article
ISSN: 0144-5154

Keywords

1 – 10 of 15
Per page
102050