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Article
Publication date: 4 January 2016

Zhongsheng Wang, Zhizhong Han and Limin Li

The purpose of this paper is to solve difficult estimation problem on aircraft sudden fault by proposing a new pre-estimating method according to the energy evolution degree of…

Abstract

Purpose

The purpose of this paper is to solve difficult estimation problem on aircraft sudden fault by proposing a new pre-estimating method according to the energy evolution degree of the sensitive parameters to estimate the sudden fault. The sudden fault affects seriously the flight safety of aircraft.

Design/methodology/approach

It is based on the dissipative structure theory, and the evolution process of energy parameters is utilized. First, the evolution key points of sudden fault are determined by the time-varying entropy of sensitive parameters and the frequency band energy distribution. Then, we can obtain the evolution degree of sample while the evolution key points import the logistic regression (LR) model, and one can establish the pre-estimation model by means of relevance vector machine (RVM). While the evolution feature vector imports the RVM pre-estimation model, one can pre-estimate the sudden fault of aircraft.

Findings

The simulation results showed that this method can not only track the evolution process of aircraft sudden fault but also estimate its evolution degree, and it has a higher pre-estimating accuracy.

Practical implications

It provides a new way to forecast the sudden fault and increase the security of aircraft.

Originality/value

This paper proposes a pre-estimating method on aircraft sudden fault. It is based on the dissipative structure theory and the energy-sensitive parameters of the sudden faults are used. This method can enhance the security of aircraft and increase the protective ability of sudden fault on aircraft.

Details

Aircraft Engineering and Aerospace Technology: An International Journal, vol. 88 no. 1
Type: Research Article
ISSN: 0002-2667

Keywords

Article
Publication date: 29 March 2011

Xianqiang Zhu and Zhenfeng Shao

The purpose of this paper is to analyze the spectrum influence between radon transform and log‐polar transform when rotation and scale effect is eliminated. The average retrieval…

1402

Abstract

Purpose

The purpose of this paper is to analyze the spectrum influence between radon transform and log‐polar transform when rotation and scale effect is eliminated. The average retrieval performance of wavelet and NSCT with different retrieval parameters is also studied.

Design/methodology/approach

The authors designed a multi‐scale and multi‐orientation texture transform spectrum, as well as rotation‐invariant feature vector and its measurement criteria. Then a new two‐level coarse‐to‐fine rotation and scale‐invariant texture retrieval algorithm based on no‐parameter statistic features was proposed. Experiments on VisTex texture database show that the algorithm proposed in this paper is appropriate for main orientation capturing and detail information description.

Findings

According to the experiments results, it was found that the combination of this two‐level progressive retrieval strategy and multi‐scale analysis method can effectively improve retrieval efficiency compared with traditional algorithms and ensure a high precision as well.

Originality/value

The paper presents a novel algorithm for rotation and scale‐invariant texture retrieval.

Details

Sensor Review, vol. 31 no. 2
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 23 August 2017

Probal Dutta, Md Hasib Noor and Anupam Dutta

The purpose of this paper is to investigate whether the crude oil volatility index (OVX) plays any key role in explaining the trend in emerging market stock returns from a global…

1463

Abstract

Purpose

The purpose of this paper is to investigate whether the crude oil volatility index (OVX) plays any key role in explaining the trend in emerging market stock returns from a global standpoint.

Design/methodology/approach

At the empirical stage, different forms of the GARCH-jump model have been estimated.

Findings

The findings confirm the effects of OVX on equity returns. In addition, the results document that there exist time-varying jumps in the stock market returns. Besides, the impacts of OVX shocks appear to be symmetric. The analysis further shows that the magnitude of OVX impact is marginally bigger than that of the conventional oil price shocks.

Originality/value

Since various financial assets are traded on the basis of oil and equity markets, investors, for instance, could use the findings of this study for taking proper investment decisions and gaining better portfolio diversification benefits. Additionally, policymakers could utilize the results to develop effective measures and strategies in order to minimize the oil price risk.

Details

International Journal of Managerial Finance, vol. 13 no. 5
Type: Research Article
ISSN: 1743-9132

Keywords

Article
Publication date: 5 June 2017

Md Hasib Noor and Anupam Dutta

The purpose of this paper is to investigate the volatility linkage between global oil market and major South Asian equity markets.

Abstract

Purpose

The purpose of this paper is to investigate the volatility linkage between global oil market and major South Asian equity markets.

Design/methodology/approach

In order to serve the purpose, the authors employ a recently developed vector autoregressive-generalized autoregressive conditional heteroskedastic model to examine whether shocks and volatility spill over from the oil market to various equity markets under consideration.

Findings

The findings of the empirical analysis suggest that all the markets studied do receive volatility from the oil market. Not surprisingly, the authors do not find any significant evidence of volatility transmission from the equity markets to the global oil market. Additionally, while computing the optimal portfolio weights and hedge ratios, the authors document that inclusion of oil in the portfolio of stocks tends to reduce the risk of the resultant portfolio.

Originality/value

Fully original.

Details

International Journal of Managerial Finance, vol. 13 no. 3
Type: Research Article
ISSN: 1743-9132

Keywords

Article
Publication date: 1 November 1941

The method of making a series of similarly shaped structural elements adapted to occupy spaced positions in a constructional assembly, comprising the steps of forming the…

Abstract

The method of making a series of similarly shaped structural elements adapted to occupy spaced positions in a constructional assembly, comprising the steps of forming the individual elements of said series as a structural member having a plurality of angularly related faces similar to each other in shape but differing in size so that the outer contour of a smaller element is substantially congruent to the inner contour of a larger element, by corrugating a piece of sheet metal so as to include the angularly related faces of all said elements connected with each other along their congruent contours respectively, and each part of each element being spaced from the corresponding part of the adjacent element by a distance which is proportional to the spacing which such portions will have in the finished assembly, and separating the similarly shaped elements of said blank by cutting the blank along spaced parallel lines which are located in corresponding positions in adjacent portions.

Details

Aircraft Engineering and Aerospace Technology, vol. 13 no. 11
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 October 2001

James Hagy and Chris Flynn

The advent of retail deregulation (liberalisation) in the United States electricity markets provides major energy users, for the first time, significant choice in energy…

Abstract

The advent of retail deregulation (liberalisation) in the United States electricity markets provides major energy users, for the first time, significant choice in energy procurement. With choice comes responsibility for sorting the wide range of potential services, associated risks, and variables in price. As deregulation has progressed, the emerging market has not yet reached maturity for retail consumers, resulting in significant price volatility and imbalances in supply in some regions. This paper, presented in two parts in this and the next issue of the Journal, explains the fundamentals of energy choice for commercial and industrial energy users and the criteria to be considered in making long‐term energy commitments.

Details

Journal of Corporate Real Estate, vol. 3 no. 4
Type: Research Article
ISSN: 1463-001X

Keywords

Article
Publication date: 14 September 2022

Yosafat Winarto, Ofita Purwani, Wiwik Setyaningsih and Bambang Triratma

This research is oriented to the need for new ideas related to the concept of a green campus that respond to climate change. The concept is simulated with a campus area in…

Abstract

Purpose

This research is oriented to the need for new ideas related to the concept of a green campus that respond to climate change. The concept is simulated with a campus area in Indonesia, a country that requires a lot of school planning for human resource development that requires clean, renewable energy and zero emissions in a humid tropical climate.

Design/methodology/approach

The research was carried out in a mixed qualitative-quantitative method using field observations and literature studies through an approach to developing a pedagogical pattern of cognitive, affective and psychomotor, relevant theoretical studies and comprehensive analysis of all variables and aspects. Analysis through the parameter matrix of green buildings and green campuses to produce a zero emission and energy efficient campus area concept.

Findings

The concept of an integrated campus area model that can holistically save energy optimally and free from emissions and can produce graduates who are aware and have high cognitive, affective and psychomotor competencies toward environmental conservation efforts. Green campus design is not only physical design, but needs to be integrated with green curriculum content.

Research limitations/implications

The limitation of this research is in the scope of architectural and environmental sciences.

Practical implications

The practical implication of this research is a new green campus concept that is environmentally friendly and sustainable in a hot-humid tropical climate.

Social implications

This research revives the cognitive, affective and psychomotor competencies of human individuals at the highest level to equip the ability to repair and maintain the environment. The research resulted in a refinement of the green campus concept that was integrated into the curriculum.

Originality/value

A holistic and integrated green campus concept between the development of campus area design and human development aspects.

Details

Archnet-IJAR: International Journal of Architectural Research, vol. 17 no. 1
Type: Research Article
ISSN: 2631-6862

Keywords

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