Bo Sun, Yadan Zeng, Houde Dai, Junhao Xiao and Jianwei Zhang
This paper aims to present the spherical entropy image (SEI), a novel global descriptor for the scan registration of three-dimensional (3D) point clouds. This paper also…
Abstract
Purpose
This paper aims to present the spherical entropy image (SEI), a novel global descriptor for the scan registration of three-dimensional (3D) point clouds. This paper also introduces a global feature-less scan registration strategy based on SEI. It is advantageous for 3D data processing in the scenarios such as mobile robotics and reverse engineering.
Design/methodology/approach
The descriptor works through representing the scan by a spherical function named SEI, whose properties allow to decompose the six-dimensional transformation into 3D rotation and 3D translation. The 3D rotation is estimated by the generalized convolution theorem based on the spherical Fourier transform of SEI. Then, the translation recovery is determined by phase only matched filtering.
Findings
No explicit features and planar segments should be contained in the input data of the method. The experimental results illustrate the parameter independence, high reliability and efficiency of the novel algorithm in registration of feature-less scans.
Originality/value
A novel global descriptor (SEI) for the scan registration of 3D point clouds is presented. It inherits both descriptive power of signature-based methods and robustness of histogram-based methods. A high reliability and efficiency registration method of scans based on SEI is also demonstrated.
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Fei Shang, Bo Sun and Dandan Cai
The purpose of this study is to investigate the application of non-destructive testing methods in measuring bearing oil film thickness to ensure that bearings are in a normal…
Abstract
Purpose
The purpose of this study is to investigate the application of non-destructive testing methods in measuring bearing oil film thickness to ensure that bearings are in a normal lubrication state. The oil film thickness is a crucial parameter reflecting the lubrication status of bearings, directly influencing the operational state of bearing transmission systems. However, it is challenging to accurately measure the oil film thickness under traditional disassembly conditions due to factors such as bearing structure and working conditions. Therefore, there is an urgent need for a nondestructive testing method to measure the oil film thickness and its status.
Design/methodology/approach
This paper introduces methods for optically, electrically and acoustically measuring the oil film thickness and status of bearings. It discusses the adaptability and measurement accuracy of different bearing oil film measurement methods and the impact of varying measurement conditions on accuracy. In addition, it compares the application scenarios of other techniques and the influence of the environment on detection results.
Findings
Ultrasonic measurement stands out due to its widespread adaptability, making it suitable for oil film thickness detection in various states and monitoring continuous changes in oil film thickness. Different methods can be selected depending on the measurement environment to compensate for measurement accuracy and enhance detection effectiveness.
Originality/value
This paper reviews the basic principles and latest applications of optical, electrical and acoustic measurement of oil film thickness and status. It analyzes applicable measurement methods for oil film under different conditions. It discusses the future trends of detection methods, providing possible solutions for bearing oil film thickness detection in complex engineering environments.
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Can Zhong Yao, Bo Yi Sun and Ji Nan Lin
This paper aims to capture tail dependence between sentiment index and Shanghai composite index (SCI) by proposing a sentiment index based on text mining.
Abstract
Purpose
This paper aims to capture tail dependence between sentiment index and Shanghai composite index (SCI) by proposing a sentiment index based on text mining.
Design/methodology/approach
Online text mining and the Copula model were used in this study.
Findings
First, the paper finds herding effect in the expression of investors’ sentiment from online text data, and the usage occurrence frequency of most vocabulary is less correlative with SCI. Second, given these two features, the paper uses weighted divide-and-conquer algorithm to construct a sentiment index. Finally, because of multivariate non-Gaussian joint distribution between them, the paper uses the Copula model to detect their tail dependences, and finds that both upper and lower tail dependences could have a significant influence between positive sentiment and SCI, with a higher probability on the upper one. Additionally, only the upper tail dependence exhibits the significant influence between negative sentiment and SCI.
Originality/value
This paper proposes a framework of constructing investment sentiment index with the weighted conquer-and-divide algorithm, and characterizes tail dependence between sentiment index and SCI. The implication can measure the environment of investment market of China and provide an empirical ground for bandwagon effect and bargain shopper effect.
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Wenzhu Lu, Bo Sun, Shengxian Yu and Shanshi Liu
This research examined how customer mistreatment activates individual customer-directed counterproductive work behavior (CWBC) by investigating the mediating roles of negative…
Abstract
Purpose
This research examined how customer mistreatment activates individual customer-directed counterproductive work behavior (CWBC) by investigating the mediating roles of negative work reflection and negative affect. It also explored whether job autonomy buffers the negative impact of customer mistreatment on CWBC.
Design/methodology/approach
The authors tested their predictions using an experience-sample method with a sample of data from 79 service workers across eight days. A multilevel structural equation model was used to test the hypotheses.
Findings
The authors found that negative work reflection and negative affect mediated the association between customer mistreatment and CWBC. In addition, job autonomy moderated the indirect impact of daily customer mistreatment on employees' CWBC through negative work reflection and negative affect.
Research limitations/implications
There are some concerns about a common method because all of the study variables were self-reported. Moreover, the study sample consisted of participants recruited exclusively from China, thus limiting this research's generality.
Practical implications
To eliminate the detrimental impact of customer mistreatment, supervisors can strive to improve the autonomy of those who interact with customers frequently to reduce their CWBC.
Originality/value
This study offers an integrative view to explain why service workers engage in CWBC when suffering customer mistreatment by testing the mediating mechanisms of negative reflection and negative affect in the association between daily customer mistreatment and CWBC. Second, the authors have broadened the study of customer mistreatment by introducing job autonomy as a critical condition, eliminating the indirect association between customer mistreatment and CWBC.
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Fowei Wang, Bo Shen, Shaoyuan Sun and Zidong Wang
The purpose of this paper is to improve the accuracy of the facial expression recognition by using genetic algorithm (GA) with an appropriate fitness evaluation function and…
Abstract
Purpose
The purpose of this paper is to improve the accuracy of the facial expression recognition by using genetic algorithm (GA) with an appropriate fitness evaluation function and Pareto optimization model with two new objective functions.
Design/methodology/approach
To achieve facial expression recognition with high accuracy, the Haar-like features representation approach and the bilateral filter are first used to preprocess the facial image. Second, the uniform local Gabor binary patterns are used to extract the facial feature so as to reduce the feature dimension. Third, an improved GA and Pareto optimization approach are used to select the optimal significant features. Fourth, the random forest classifier is chosen to achieve the feature classification. Subsequently, some comparative experiments are implemented. Finally, the conclusion is drawn and some future research topics are pointed out.
Findings
The experiment results show that the proposed facial expression recognition algorithm outperforms ones in the existing literature in terms of both the actuary and computational time.
Originality/value
The GA and Pareto optimization algorithm are combined to select the optimal significant feature. To improve the accuracy of the facial expression recognition, the GA is improved by adjusting an appropriate fitness evaluation function, and a new Pareto optimization model is proposed that contains two objective functions indicating the achievements in minimizing within-class variations and in maximizing between-class variations.
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THE air flow in the slipstream of an airscrew is helical in nature. It follows, therefore, that there is a torque reaction on the whole aircraft which must be overcome by an equal…
Abstract
THE air flow in the slipstream of an airscrew is helical in nature. It follows, therefore, that there is a torque reaction on the whole aircraft which must be overcome by an equal and opposite moment produced by an asymmetrical distribution of air forces on the aeroplane as a whole. These torque effects are very marked in small aircraft with high power; particularly when the airscrew is slow running, and when the speed is low at take‐off or in climb. They show up most noticeably in regard to the control movements which are necessary to neutralise them. In multi‐engined aircraft the engines are arranged to turn in opposite directions and so neutralise torque effects. It is clear, however, that in all cases where there is no deliberate attempt to neutralise there will be some “Residual Torque.”
Hasri Mustafa and Mohd Ikhwan Ibrahim
The purpose of this paper is to study the governance structure in the ancient Melaka Kingdom (1401–1511 AD) using historical Hukum Kanun Melaka (the Land Law) and Undang-Undang…
Abstract
Purpose
The purpose of this paper is to study the governance structure in the ancient Melaka Kingdom (1401–1511 AD) using historical Hukum Kanun Melaka (the Land Law) and Undang-Undang Laut Melaka (the Maritime Law). The focus is on self-correction, control and accountability that were used to preserve the peace and well-being of society and the overall harmony of the community during the period.
Design/methodology/approach
The study employs close readings to discover and identify implicit formal and thematic elements of the texts into a meaningful enactment. The study is based on historical archival research at the National Archives of Malaysia and at the National Library of Malaysia.
Findings
Though classical, the underlying accounting practices were shown to consummate in an articulated model of measurement activities based on specific proportion of gold in tahil measurement, used for slaves, free men and stolen animal and property value. Controls were established through punishment and penalty. Accountability functioned in different levels and degrees hierarchically and horizontally.
Research limitations/implications
The study excludes the improved sections of the laws that are based on the Islamic perspective. The discussion is limited to the indigenous adat sections of laws only although the sections may inseparable with the Hindu/Buddhist tradition.
Originality/value
A study of these classical laws would be a reference for accounting publication in the Malay world which has been stationed in the gallery for many years, awaiting discovery.
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Examines the fifthteenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects…
Abstract
Examines the fifthteenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects. Subjects discussed include cotton fabric processing, asbestos substitutes, textile adjuncts to cardiovascular surgery, wet textile processes, hand evaluation, nanotechnology, thermoplastic composites, robotic ironing, protective clothing (agricultural and industrial), ecological aspects of fibre properties – to name but a few! There would appear to be no limit to the future potential for textile applications.
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Examines the fourteenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects…
Abstract
Examines the fourteenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects. Subjects discussed include cotton fabric processing, asbestos substitutes, textile adjuncts to cardiovascular surgery, wet textile processes, hand evaluation, nanotechnology, thermoplastic composites, robotic ironing, protective clothing (agricultural and industrial), ecological aspects of fibre properties – to name but a few! There would appear to be no limit to the future potential for textile applications.
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Now and again a book relating to library interests comes to hand that deserves special notice, and such a work is the New York State Library School Register, 1887–1926, which was…
Abstract
Now and again a book relating to library interests comes to hand that deserves special notice, and such a work is the New York State Library School Register, 1887–1926, which was published by the New York State Library School Association, Inc., in 1959. We might have received a copy for notice earlier, but Mr. Karl Brown, the Editor of the volume, writes that he “had not thought of sending copies outside the States feeling that it might be considered a provincial book, as London sometimes tells us!” Mr. Brown has been much too bashful. We personally were most happy to receive a copy from him following an enquiry the nature of which will be explained later. In this article we begin by reviewing the book, but at a later stage we indicate by a little study of one person the unusual interest of the work to librarians in terms of library history and of the movements of librarians from one land to another.