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Structural Models of Wage and Employment Dynamics
Type: Book
ISBN: 978-0-44452-089-0

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Book part
Publication date: 16 December 2009

Zongwu Cai, Jingping Gu and Qi Li

There is a growing literature in nonparametric econometrics in the recent two decades. Given the space limitation, it is impossible to survey all the important recent…

Abstract

There is a growing literature in nonparametric econometrics in the recent two decades. Given the space limitation, it is impossible to survey all the important recent developments in nonparametric econometrics. Therefore, we choose to limit our focus on the following areas. In Section 2, we review the recent developments of nonparametric estimation and testing of regression functions with mixed discrete and continuous covariates. We discuss nonparametric estimation and testing of econometric models for nonstationary data in Section 3. Section 4 is devoted to surveying the literature of nonparametric instrumental variable (IV) models. We review nonparametric estimation of quantile regression models in Section 5. In Sections 2–5, we also point out some open research problems, which might be useful for graduate students to review the important research papers in this field and to search for their own research interests, particularly dissertation topics for doctoral students. Finally, in Section 6 we highlight some important research areas that are not covered in this paper due to space limitation. We plan to write a separate survey paper to discuss some of the omitted topics.

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Nonparametric Econometric Methods
Type: Book
ISBN: 978-1-84950-624-3

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Article
Publication date: 8 September 2021

Yuezong Wang, Jinghui Liu, Mengfei Guo and LiuQIan Wang

A three-dimensional (3D) printing error simulation approach is proposed to analyze the influence of tilted vertical beams on the 3D printing accuracy. The purpose of this…

Abstract

Purpose

A three-dimensional (3D) printing error simulation approach is proposed to analyze the influence of tilted vertical beams on the 3D printing accuracy. The purpose of this study is to analyze the influence of such errors on printing accuracy and printing quality for delta-robot 3D printer.

Design/methodology/approach

First, the kinematic model of a delta-robot 3D printer with an ideal geometric structure is proposed by using vector analysis. Then, the normal kinematic model of a nonideal delta-robot 3D robot with tilted vertical beams is derived based on the above ideal kinematic model. Finally, a 3D printing error simulation approach is proposed to analyze the influence of tilted vertical beams on the 3D printing accuracy.

Findings

The results show that tilted vertical beams can indeed cause 3D printing errors and further influence the 3D printing quality of the final products and that the 3D printing errors of tilted vertical beams are related to the rotation angles of the tilted vertical beams. The larger the rotation angles of the tilted vertical beams are, the greater the geometric deformations of the printed structures.

Originality/value

Three vertical beams and six horizontal beams constitute the supporting parts of the frame of a delta-robot 3D printer. In this paper, the orientations of tilted vertical beams are shown to have a significant influence on 3D printing accuracy. However, the effect of tilted vertical beams on 3D printing accuracy is difficult to capture by instruments. To reveal the 3D printing error mechanisms under the condition of tilted vertical beams, the error generation mechanism and the quantitative influence of tilted vertical beams on 3D printing accuracy are studied by simulating the parallel motion mechanism of a delta-robot 3D printer with tilted vertical beams.

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Rapid Prototyping Journal, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 1 January 1987

RONALD R. YAGER

Quasi‐associative operators are defined and suggested as a general structure useful for representing a class of operators used to combine various pieces of evidence. We…

Abstract

Quasi‐associative operators are defined and suggested as a general structure useful for representing a class of operators used to combine various pieces of evidence. We show that both averaging operators and Dempster‐Shafer combining operators can be represented in this new framework.

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Kybernetes, vol. 16 no. 1
Type: Research Article
ISSN: 0368-492X

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Book part
Publication date: 2 June 2008

Sugata Marjit

This chapter builds up a simple general equilibrium trade model where, in the absence of a credit market for human capital formation, initial distribution of capital…

Abstract

This chapter builds up a simple general equilibrium trade model where, in the absence of a credit market for human capital formation, initial distribution of capital endowment and relevant factor prices determine the size of the three income classes. The poor, with little capital, invests in traditional manufacturing, the middle-income group invests solely in human capital and the rich invests in both. Chances are that such an economy will export both high- and low-skilled goods, importing the middle one. Conventional wisdom suggests that greater skill premium encourages skill formation. In contrast, we show that higher unskilled wage and lower degree of income inequality are consistent with greater skill formation. We also show that protection discourages skill formation and may aggravate inequality.

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Contemporary and Emerging Issues in Trade Theory and Policy
Type: Book
ISBN: 978-1-84950-541-3

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Article
Publication date: 5 June 2020

Adya Hermawati

This study aims to examine the effect of transglobal leadership on quality of work life (QWL), job involvement, organizational citizenship behavior (OCB) and human…

Abstract

Purpose

This study aims to examine the effect of transglobal leadership on quality of work life (QWL), job involvement, organizational citizenship behavior (OCB) and human resource (HR) performance of tourism sector-engaged micro, small and medium enterprises (MSMEs) in East Java; to examine the moderating role of QWL, job involvement and OCB in the effect of transglobal leadership on HR performance of tourism sector-engaged MSMEs in East Java; to examine the effect of HR performance of tourism sector-engaged MSMEs on responsible tourism marketing and sustainable tourism competitiveness in East Java; and to examine the mediating role of responsible tourism marketing in the effect of HR performance of tourism sector-engaged MSMEs on sustainable tourism competitiveness in East Java.

Design/methodology/approach

The population of this research was all HR executives of tourism sector-engaged MSMEs in East Java and domestic and foreign tourists in East Java. The sampling of the tourism sector-engaged MSMEs in East Java (in 16 tourism potential cities) was performed using a purposive sampling technique. Determination of the sample size was made using the minimum criterion from structural model, ranging from 100 to 200. Thus, it was determined that the number of tourism sector-engaged MSMEs studied in this research was 200 enterprises from 16 tourism potential cities in East Java. From each tourism sector MSME, four employees and three tourists were selected. In total, this research involved 800 employees and 600 tourists (both domestic and foreign).

Findings

This research found that transglobal leadership (X) , QBL (M1), job involvement (M2) and OCB (M3) had an effect on HR performance (Y). The results of this research highlighted that QWL variable (M1) moderated the effect of transglobal leadership (X) on HR performance (Y). It was found that job involvement variable (M2) moderated the effect of transglobal leadership (X) on HR performance (Y). This research also detected that OCB variable (M3) moderated the effect of transglobal leadership (X) on HR performance (Y). This research found that HR performance (Y) had an effect on responsible marketing (Z1). It was obtained in this research that HR performance (Y) also had an effect on sustainable tourism competitiveness (Z2). Finally, this research found that responsible marketing (Z1) had an effect on sustainable tourism competitiveness (Z2).

Originality/value

Regarding the originality of this research, the holistic compilation was integrated from the theoretical concept of the HR and marketing strategies through the implementation of the tourism marketing concept and application that are responsible for tourism sector-engaged MSMEs in East Java. Of course, tourists need to get a good understanding of the marketing strategy to participate in controlling the sustainable tourism competitiveness in East Java.

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International Journal of Tourism Cities, vol. 6 no. 4
Type: Research Article
ISSN: 2056-5607

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Article
Publication date: 1 July 1992

Z. An, D.A. Bell and J.G. Hughes

Presents an investigation of some aspects of the axiomization of conditional independence of probability. Contributes to the understanding of Pearl's completeness…

Abstract

Presents an investigation of some aspects of the axiomization of conditional independence of probability. Contributes to the understanding of Pearl's completeness conjecture and identifies a direction for revision which could remove some of the difficulties of Pearl's axiom set, but this alternative is not without its own difficulties. This approach largely simplifies the definition of conditional independence. Then shows the completeness conjecture to be incorrect by presenting counter examples; a new axiom based on the counter examples follows. Discusses the reason for the conjecture being incorrect. Notes that an alternative conjecture could be suggested, but this raises many new questions and increases complexity. Finally, shows that “the disjointness condition on variable sets” is in fact necessary. Concludes that while the axiomization of conditional independence has attractions, it is probably too complex to be pragmatic. Suggests an alternative way forward in inexact reasoning.

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Kybernetes, vol. 21 no. 7
Type: Research Article
ISSN: 0368-492X

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Article
Publication date: 1 January 1983

Stephen P. Witt

A binary choice model explaining the distribution of holidays abroad undertaken by UK residents is constructed and estimated. The foreign holiday demand function is…

Abstract

A binary choice model explaining the distribution of holidays abroad undertaken by UK residents is constructed and estimated. The foreign holiday demand function is generated from a comparison of holiday costs and benefits, and stochastic behaviour is permitted. In addition, the effects of incomplete knowledge on holiday choice are incorporated in the model. It is shown that the empirical results support the theoretical framework and that the £50 foreign currency limit imposed by the British Government between 1966 and 1969 resulted in a shift in the distribution of foreign holidays.

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Journal of Economic Studies, vol. 10 no. 1
Type: Research Article
ISSN: 0144-3585

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Article
Publication date: 1 April 1991

S. RAKHEJA and A.K.W. AHMED

A local equivalent linearization methodology is proposed to simulate non‐linear shock absorbers and dual‐phase dampers in the convenient frequency domain. The methodology…

Abstract

A local equivalent linearization methodology is proposed to simulate non‐linear shock absorbers and dual‐phase dampers in the convenient frequency domain. The methodology based on principle of energy similarity, characterizes the non‐linear dual‐phase dampers via an array of local damping constants as function of local excitation frequency and amplitude, response, and type of non‐linearity. The non‐linear behaviour of the dual‐phase dampers can thus be predicted quite accurately in the entire frequency range. The frequency response characteristics of a vehicle model employing non‐linear dual‐phase dampers, evaluated using local linearization algorithm, are compared to those of the non‐linear system, established via numerical integration, to demonstrate the effectiveness of the algorithm. An error analysis is performed to quantify the maximum error between the damping forces generated by non‐linear and locally linear simulations. The influence of damper parameters on the ride improvement potentials of dual‐phase dampers is further evaluated using the proposed methodology and discussed.

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Engineering Computations, vol. 8 no. 4
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 6 August 2019

Yuezong Wang, Zhaodong Wang, Mengfei Guo and Xin Zhang

The purpose of this study is to propose an automatic leveling method for a printing platform based on a three-point coordinate feedback. The proposed method is used in…

Abstract

Purpose

The purpose of this study is to propose an automatic leveling method for a printing platform based on a three-point coordinate feedback. The proposed method is used in fused deposition modeling additive manufacturing systems. The coordinate error of the leveled plane is constrained to within  ± 0.2 mm, which is less than the printed layer thickness.

Design/methodology/approach

First, the model of the forward and inverse solutions of the parallel arm is obtained based on the principles of vector algebra. Second, the automatic leveling mechanism for collecting the z-coordinate is designed. The best position of the virtual origin plane is obtained by comparing the z-coordinates of the test points. Finally, after making multiple adjustments through a closed-loop z-coordinate feedback, the parallelism of the printing plane and the virtual origin plane is limited to an effective range.

Findings

The experimental results show that after three leveling attempts, the z-coordinate of the test points can be constrained to within  ± 0.2 mm, which shows that this method can effectively achieve automatic leveling in a delta three-dimensional (3D) printer.

Originality/value

This study presents a novel and distinctive delta 3D printer leveling system by designing a leveling mechanism and a leveling algorithm. The method uses a closed-loop feedback mode to make the leveling process simple, convenient and efficient without requiring major changes to the printer. The error after leveling is less than the printed layer thickness, which fully guarantees the accuracy of the leveling process.

Details

Rapid Prototyping Journal, vol. 25 no. 7
Type: Research Article
ISSN: 1355-2546

Keywords

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