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Article
Publication date: 16 April 2018

Dianzi Liu, Chengyang Liu, Chuanwei Zhang, Chao Xu, Ziliang Du and Zhiqiang Wan

In real-world cases, it is common to encounter mixed discrete-continuous problems where some or all of the variables may take only discrete values. To solve these…

Abstract

Purpose

In real-world cases, it is common to encounter mixed discrete-continuous problems where some or all of the variables may take only discrete values. To solve these non-linear optimization problems, the use of finite element methods is very time-consuming. The purpose of this study is to investigate the efficiency of the proposed hybrid algorithms for the mixed discrete-continuous optimization and compare it with the performance of genetic algorithms (GAs).

Design/methodology/approach

In this paper, the enhanced multipoint approximation method (MAM) is used to reduce the original nonlinear optimization problem to a sequence of approximations. Then, the sequential quadratic programing technique is applied to find the continuous solution. Following that, the implementation of discrete capability into the MAM is developed to solve the mixed discrete-continuous optimization problems.

Findings

The efficiency and rate of convergence of the developed hybrid algorithms outperforming GA are examined by six detailed case studies in the ten-bar planar truss problem, and the superiority of the Hooke–Jeeves assisted MAM algorithm over the other two hybrid algorithms and GAs is concluded.

Originality/value

The authors propose three efficient hybrid algorithms, the rounding-off, the coordinate search and the Hooke–Jeeves search-assisted MAMs, to solve nonlinear mixed discrete-continuous optimization problems. Implementations include the development of new procedures for sampling discrete points, the modification of the trust region adaptation strategy and strategies for solving mix optimization problems. To improve the efficiency and effectiveness of metamodel construction, regressors f defined in this paper can have the form in common with the empirical formulation of the problems in many engineering subjects.

Details

Engineering Computations, vol. 35 no. 2
Type: Research Article
ISSN: 0264-4401

Keywords

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Article
Publication date: 7 November 2019

Chao Xu, Xianqiang Yang and Xiaofeng Liu

This paper aims to investigate a probabilistic mixture model for the nonrigid point set registration problem in the computer vision tasks. The equations to estimate the…

Abstract

Purpose

This paper aims to investigate a probabilistic mixture model for the nonrigid point set registration problem in the computer vision tasks. The equations to estimate the mixture model parameters and the constraint items are derived simultaneously in the proposed strategy.

Design/methodology/approach

The problem of point set registration is expressed as Laplace mixture model (LMM) instead of Gaussian mixture model. Three constraint items, namely, distance, the transformation and the correspondence, are introduced to improve the accuracy. The expectation-maximization (EM) algorithm is used to optimize the objection function and the transformation matrix and correspondence matrix are given concurrently.

Findings

Although amounts of the researchers study the nonrigid registration problem, the LMM is not considered for most of them. The nonrigid registration problem is considered in the LMM with the constraint items in this paper. Three experiments are performed to verify the effectiveness and robustness and demonstrate the validity.

Originality/value

The novel method to solve the nonrigid point set registration problem in the presence of the constraint items with EM algorithm is put forward in this work.

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Article
Publication date: 4 July 2016

Yao-Wen Xue and Yan-Hua Zhang

To implement a risk-based regulatory approach, this paper aims to make an assessment on customers' money laundering risk and conducts some applications.

Abstract

Purpose

To implement a risk-based regulatory approach, this paper aims to make an assessment on customers' money laundering risk and conducts some applications.

Design/methodology/approach

During the transition of a regulatory approach from “rule-based” to “risk-based”, this paper considers that the area of a customer, types of business and the industries to which the customer belongs are the main indicators to judge money laundering risk of a customer. Based on the statistical analysis of 221 typical money laundering cases, first-class index weights are given by using the entropy weight method and then by combining with the membership function, this paper determines a customer’s money laundering risk levels. On the basis of the entropy weight method, this paper uses the C5.0 algorithm to construct a decision tree model and then carries out application research on customer money laundering risk assessment to verify the effectiveness of the entropy weight method and the decision tree model.

Findings

This empirical research found the weights of three key money laundering indicators: customer areas, business types and corresponding industries.

Originality/value

Asserting that current money laundering risk assessments of customers are marginal at best, this paper contends from the perspective of practice, and applies the entropy weight method and the decision tree model for money laundering risk assessment of customers.

Details

Journal of Money Laundering Control, vol. 19 no. 3
Type: Research Article
ISSN: 1368-5201

Keywords

Content available
Article
Publication date: 9 December 2019

Jihai Jiang, Wei-Peng Yan and Ge-Qiang Li

The purpose of this paper is to analyze the micro-motion of the cylinder block.

Abstract

Purpose

The purpose of this paper is to analyze the micro-motion of the cylinder block.

Design/methodology/approach

Based on the elasto-hydrodynamic lubrication, a numerical model for the cylinder block/valve plate interface is proposed, with consideration of the elastic deformations, the pressure-viscosity effect and asperity contacts. The influence-function method is applied to calculating the actual deformations of the cylinder block and the valve plate. The asperity contact model simplified from Greenwood assumption is introduced into the numerical model. Furthermore, the relationship between the micro-motion and the operating condition, the sealing belt width is discussed, respectively.

Findings

The results show an increase in the discharge pressure causes the tilt state and the vibrating motion getting worse, which can be eased by improving the rotational speed, the sealing belt width and the ratio of external and internal sealing belt width.

Originality/value

The proposed research can provide a theoretical reference for the optimizing design of cylinder block/valve plate pair.

Details

Industrial Lubrication and Tribology, vol. 72 no. 5
Type: Research Article
ISSN: 0036-8792

Keywords

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Book part
Publication date: 16 November 2012

Virginia Hernández and María Jesús Nieto

Purpose – This chapter analyzes the relation between normative and cultural-cognitive institutional distance and the international entry forms of SMEs. We also examine the…

Abstract

Purpose – This chapter analyzes the relation between normative and cultural-cognitive institutional distance and the international entry forms of SMEs. We also examine the interaction effect of each of these distances and the regulatory development of the destination on entry mode choice.

Methodology/approach – This chapter deals with a multilevel analysis of a database of European SMEs containing information on different locations and three entry forms: exports; collaborative modes and direct investment.

Findings – The results indicate that greater levels of normative distance increase the likelihood of using collaborative forms in SMEs. Similarly, the findings also show that the preference for collaborative forms grows as the cultural-cognitive distance increases. In both cases, the study finds a positive moderating effect of regulative institutions on these relations.

Originality/value of chapter – The chapter contributes to the literature by separately considering informal institutional dimensions such as normative and cultural-cognitive distances, as well as examining how the regulatory development of the destination may moderate these relations. Additionally, the study sheds light in the development of the literature on SMEs, both by using the institutional theory to explain the internationalization of these firms and providing a more complete picture of their entry modes.

Details

New Policy Challenges for European Multinationals
Type: Book
ISBN: 978-1-78190-020-8

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Article
Publication date: 5 September 2018

Linhao Ouyang, Zijian Zhang, Xiaoling Huang and Shi Xie

The purpose of this study is to restore the spatial distribution of overseas remittance businesses in Shantou during the 1940s. It explores various socioeconomic factors…

Abstract

Purpose

The purpose of this study is to restore the spatial distribution of overseas remittance businesses in Shantou during the 1940s. It explores various socioeconomic factors that influenced the concentration of local remittance business investment in real estate. By reconstructing the spatial distribution of remittance business activities in Shantou, this study hopes to lay a foundation for further analysis of the business strategies of Chaoshan merchants.

Design/methodology/approach

This research draws on information from the published Swatow Guide, archival sources and cadastral maps to identify the location of remittance enterprises and the native place and overseas networks of property owners.

Finding

This study reveals that the spatial distribution of the remittance enterprises was determined by the native place origins of local property owners, and that the inflow of overseas Chinese capital contributed to real estate development in Shantou.

Research limitations/implications

Despite the limited access to Chinese official archives, this paper manages to identify several building blocks and neighbors in Shantou for spatial analysis.

Practical implications

This study is the first attempt to use the geographical information system (GIS) method in Chinese urban history research and hopes to establish a larger historical database of Shantou as a sample for comparison.

Originality/value

This investigation advances the spatial study of urban history and overseas Chinese remittances in the maritime society of South China.

Details

Social Transformations in Chinese Societies, vol. 14 no. 2
Type: Research Article
ISSN: 1871-2673

Keywords

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Article
Publication date: 13 April 2015

Chao Xu, Peilin Zhang, Guoquan Ren, Bing Li, Dinghai Wu and Hongbo Fan

This paper aims to provide an effective method so that the ultrasonic technique can be applied to the online debris particle detection. It proposes utilizing the waveshape…

Abstract

Purpose

This paper aims to provide an effective method so that the ultrasonic technique can be applied to the online debris particle detection. It proposes utilizing the waveshape features in discriminating the debris particle in lubricant.

Design/methodology/approach

The finite element model has been developed to investigate the scattering of the ultrasonic waves in lubricant containing single scatterer, such as the debris particle and the air bubble. The simulation results show that the results verify that different scatterers differ in the waveshape features. The static experiments were carried out on a specially fixture. The single spherical debris, long debris and air bubble were measured. The fast Fourier transform (FFT) method was applied to the analysis of the echo signals to obtain the features implicated in the waveshape.

Findings

The research of this paper verifies that different scatterers differ both in their shape features and in the FFT analysis features.

Research limitations/implications

The rapid movement of the debris particles as well as the lubricant temperature may influence the measuring signals. Besides, the measuring signals are usually corrupted by noise, especially for the tiny debris. Therefore, researchers are encouraged to solve those problems further.

Practical implications

The paper includes implications for the improvement in the online debris detection and the development of the ultrasonic technique applied in online debris detection.

Originality/value

The paper provides a promising way that the ultrasonic waveshape features can be utilized to the identify debris particle online.

Details

Industrial Lubrication and Tribology, vol. 67 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

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Article
Publication date: 13 January 2012

Jialin Yang, Hongwu Ouyang, Chao Xu and Yang Wang

The purpose of this paper is to describe the stability and properties of the direct metal laser fabrication (DMLF) process, by putting forward top surface quality (TSQ)…

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Abstract

Purpose

The purpose of this paper is to describe the stability and properties of the direct metal laser fabrication (DMLF) process, by putting forward top surface quality (TSQ), which could be a unique and crucially important feature compared with traditional manufacturing methods.

Design/methodology/approach

Through the systematic and detailed analysis of DMLF process using related theories of additive manufacturing technologies, it was revealed that TSQ was the key factor for controlling the stability of DMLF process and thus tailoring final properties of metallic parts. Only good TSQ can ensure the stability of DMLF process and excellent performance of metal parts in theory.

Findings

TSQ was defined as the surface morphology in macro and micro scopes in laser scanning area of unit layers during DMLF, and could be characterized by three key elements: flatness, compactness and cleanliness. The flatness was the significant factor to assure the shaping during DMLF, while the compactness and cleanliness were the decisive factors to assure the final properties of metal part for DMLF. As an example, the typical top surface defects and their contributing factors in DMLF for Cu‐based metal powder mixtures were investigated thoroughly according to the proposed definition and requirements. Moreover, the specific controlling methods of TSQ were provided and discussed. Eventually, DMLF of three‐dimensional Cu‐based metal sample with complicate structure was successfully performed by taking some effective measures for adjusting TSQ parameters.

Originality/value

Few comprehensive investigations have been carried out on this topic. The definition and evaluation methods of TSQ for DMLF have been introduced for the first time in the present paper.

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Article
Publication date: 16 May 2008

Gengui Zhou, Hokey Min, Chao Xu and Zhenyu Cao

The purpose of this paper is to develop a benchmark of performance standards for Chinese third‐party logistics providers (3PLs) in the emerging market. It also intends to…

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4967

Abstract

Purpose

The purpose of this paper is to develop a benchmark of performance standards for Chinese third‐party logistics providers (3PLs) in the emerging market. It also intends to identify various factors that significantly affect the operational efficiency of the Chinese 3PLs and propose ways to improve the competitiveness of 3PLs.

Design/methodology/approach

This paper proposes data envelopment analysis (DEA) to measure the operational efficiency of ten leading 3PLs in China, relative to prior periods and their key competitors. In particular, this paper develops both the Charnes, Cooper and Rhodes model and the Banker, Charnes and Cooper model that are designed to derive weights without being fixed in advance. It also uses step‐wise regression analysis to identify factors influencing the performances of Chinese 3PLs.

Findings

First, the declining efficiency within some Chinese 3PLs coincides with a steep decline in domestic transportation activities due to the SARS outbreak and the slow adaptation of state‐owned enterprise into a more market‐based economy. Second, the sales opportunity and the level of technical expertise are directly correlated with the operational efficiency of 3PLs, whereas the size of 3PLs has no direct bearing on the 3PL's performance. Third, in contrast with the 3PL industry in the USA, the Chinese 3PLs tend to focus on traditional service offerings such as port management, transportation, and warehousing rather than playing the role as the integrator or the lead service provider.

Originality/value

This paper is the first attempt to utilize DEA to develop performance benchmarks for 3PLs in the emerging foreign market. The proposed DEA can be easily modified or extended to similar settings in other Asian countries such as India and East European countries.

Details

International Journal of Physical Distribution & Logistics Management, vol. 38 no. 4
Type: Research Article
ISSN: 0960-0035

Keywords

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Book part
Publication date: 13 October 2016

Richard A. Devine, Kátia de Melo Galdino and Bruce T. Lamont

This research fills a gap in the literature regarding managerial retention and performance in the context of cross-border acquisitions (CBA). Blending institutional with…

Abstract

This research fills a gap in the literature regarding managerial retention and performance in the context of cross-border acquisitions (CBA). Blending institutional with resource-based theories, this study posits that retaining acquired managers becomes more important in unfamiliar environments where the institutional infrastructure is underdeveloped. Our results support the theory. Contrary to expectations and prior research, however, the results also call into question the long-held belief that managerial retention is generally beneficial to post-acquisition performance. The findings and implications are discussed regarding managerial turnover, CBA, and the institutional environment.

Details

Mergers and Acquisitions, Entrepreneurship and Innovation
Type: Book
ISBN: 978-1-78635-371-9

Keywords

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