Search results

1 – 10 of over 22000
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 mixture…

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.

Article
Publication date: 24 August 2012

A. Sellitto, R. Borrelli, F. Caputo, A. Riccio and F. Scaramuzzino

The purpose of this paper is to investigate and to assess the capabilities of the most common finite element (FE)‐based tools to deal with global‐local analysis. Two kinds of…

Abstract

Purpose

The purpose of this paper is to investigate and to assess the capabilities of the most common finite element (FE)‐based tools to deal with global‐local analysis. Two kinds of coupling were investigated: shell to shell and shell to solid.

Design/methodology/approach

The issue of connecting non‐matching FE global and local models, characterized by different mesh refinements and/or different element types, was addressed by introducing appropriate kinematic constraints on the nodes at the interfaces. The coupling techniques available in the three FE‐based codes (ABAQUS®, NASTRAN® and ANSYS®), were assessed by applying them on a common numerical test case (non‐linear buckling analysis of a square plate). Results of the global‐local simulations were compared to the results obtained for relevant reference solutions.

Findings

The continuity of displacements and stresses across the interface between global and local models and the influence of the presence of the local model on the global model solution were used as parameters to test the quality of the results. It was observed that the tools implemented in the different codes provide different results. The results characterized by a higher quality were found by using the Multi Point Constraint available in ABAQUS®.

Originality/value

When dealing with complex structures, multi‐scale (global‐local) approaches are commonly adopted to optimize the computational cost by increasing mesh refinements and/or introducing elements with different formulations in specific region of the structures identified as “local model”. In this paper an overview of the coupling tools available in the main commercial FE code is given.

Details

International Journal of Structural Integrity, vol. 3 no. 3
Type: Research Article
ISSN: 1757-9864

Keywords

Article
Publication date: 26 June 2018

Larissa Statsenko, Alex Gorod and Vernon Ireland

This paper aims to propose an empirically grounded governance framework based on complex adaptive systems (CAS) principles to facilitate formation of well-connected regional…

1297

Abstract

Purpose

This paper aims to propose an empirically grounded governance framework based on complex adaptive systems (CAS) principles to facilitate formation of well-connected regional supply chains that foster economic development, adaptability and resilience of mining regions.

Design/methodology/approach

This study is an exploratory case study of the South Australian (SA) mining industry that includes 38 semi-structured interviews with the key stakeholders and structural analysis of the regional supply network (RSN).

Findings

Findings demonstrate the applicability of the CAS framework as a structured approach to the governance of the mining industry regional supply chains. In particular, the findings exemplify the relationship between RSN governance, its structure and interconnectivity and their combined impact on the adaptability and resilience of mining regions.

Research limitations/implications

The data set analysed in the current study is static. Longitudinal data would permit a deeper insight into the evolution of the RSN structure and connectivity. The validity of the proposed framework could be further strengthened by being applied to other industrial domains and geographical contexts.

Practical/implications

The proposed framework offers a novel insight for regional policy-makers striving to create an environment that facilitates the formation of well-integrated regional supply chains in mining regions through more focussed policy and strategies.

Originality/value

The proposed framework is one of the first attempts to offer a holistic structured approach to governance of the regional supply chains based on CAS principles. With the current transformative changes in the global mining industry, policy-makers and supply chain practitioners have an urgent need to embrace CAS and network paradigms to remain competitive in the twenty-first century.

Details

Supply Chain Management: An International Journal, vol. 23 no. 4
Type: Research Article
ISSN: 1359-8546

Keywords

Article
Publication date: 17 March 2023

Seid Demeke Mekonnen

The purpose of this paper is to investigate the compliance of foreign investment projects with local environmental standards in Ethiopia. It examines the cause and impact of the…

Abstract

Purpose

The purpose of this paper is to investigate the compliance of foreign investment projects with local environmental standards in Ethiopia. It examines the cause and impact of the environmental problems created by such projects as well as the necessary policy response, especially by examining the role of the applicable bilateral investment treaties (BITs) in enforcing local standards.

Design/methodology/approach

The research approach is fundamentally an empirical study with some doctrinal analysis. The empirical data (qualitative) was collected through interviews, focus group discussions and observation tools.

Findings

The investment projects selected for the case studies were not complying with the local environmental standards, which resulted in several environmental problems. The major cause for the overall environmental problems was not a legal gap in the local standards, but the failure of enforcing such standards by the government bodies and foreign investors. The applicable BITs also played no role in environmental protection as they do not impose environmental obligations along with enforcement mechanisms. Non-compliance with local standards can be mitigated if the applicable BITs impose environmental obligations along with workable enforcement mechanisms – as a treaty obligation has more binding force. The author argues that, in general, foreign investments are not environmental-friendly unless otherwise strictly regulated by combining local environmental standards and a BIT that imposes environmental obligations (along with enforcement mechanisms) on the foreign investors, host state and home state.

Originality/value

The existing literature does not deal with the environmental problems, the enforcement constraints and the role of the applicable BITs together in a single publication. They separately address these issues, which do not give a comprehensive understanding of the cause-and-effect relationship. This paper fills this gap by presenting comprehensive findings that combine the environmental problems and the associated enforcement constraints as well as the role of the applicable BITs in this regard. It also contributes to the ongoing debate concerning whether foreign direct investment is good or bad for the environment by producing empirical evidence from Ethiopia, the African continent.

Details

Journal of Property, Planning and Environmental Law, vol. 15 no. 1
Type: Research Article
ISSN: 2514-9407

Keywords

Article
Publication date: 1 June 2005

Patrick Dular

This paper proposes an automatic procedure to characterize discrete source fields.

Abstract

Purpose

This paper proposes an automatic procedure to characterize discrete source fields.

Design/methodology/approach

A technique is developed to characterize curl‐conform fields to be used as source fields or non‐local basis functions in finite element formulations. A reduced characterization of such fields using curl‐conform finite elements is defined. An automatic construction of these curl‐conform spaces is proposed.

Findings

A reduced characterization of such fields is shown to be convenient for the coupling with complementary reaction fields and for simply and explicitly defining non‐local quantities, such as currents in h‐conform magnetodynamic formulations. The reduced form rests on the choice of supports for the fields limited to reduced cut spaces associated with cuts making the definition domain simply connected.

Originality/value

Develops a procedure to simplify the construction of curl‐conform source fields.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 24 no. 2
Type: Research Article
ISSN: 0332-1649

Keywords

Abstract

Details

Responsible Investment Around the World: Finance after the Great Reset
Type: Book
ISBN: 978-1-80382-851-0

Article
Publication date: 1 November 2005

Marcu Handte, Christian Becker and Kurt Rothermel

Pervasive computing envisions seamless support for user tasks through cooperating devices that are present in an environment. Fluctuating availability of devices, induced by…

Abstract

Pervasive computing envisions seamless support for user tasks through cooperating devices that are present in an environment. Fluctuating availability of devices, induced by mobility and failures, requires mechanisms and algorithms that allow applications to adapt to their ever‐changing execution environments without user intervention. To ease the development of adaptive applications, Becker et al. (3) have proposed the peer‐based component system PCOM. This system provides fundamental mechanisms to support the automated composition of applications at runtime. In this article, we discuss the requirements on algorithms that enable automatic configuration of pervasive applications. Furthermore, we show how finding a configuration can be interpreted as Distributed Constraint Satisfaction Problem. Based on this, we present an algorithm that is capable of finding an application configuration in the presence of strictly limited resources. To show the feasibility of this algorithm, we present an evaluation based on simulations and real‐world measurements and we compare the results with a simple greedy approximation.

Details

International Journal of Pervasive Computing and Communications, vol. 1 no. 4
Type: Research Article
ISSN: 1742-7371

Keywords

Article
Publication date: 1 May 2006

Susan Freeman and Imogen Reid

To provide an Asia‐Pacific viewpoint of the key constraints associated with large geographic distances for smaller westerns firms entering central and eastern Europe (CEE)…

2788

Abstract

Purpose

To provide an Asia‐Pacific viewpoint of the key constraints associated with large geographic distances for smaller westerns firms entering central and eastern Europe (CEE), described as a turbulent transitional environment.

Design/methodology/approach

An exploratory study was used within a qualitative methodology, using eight case studies across multiple industries. Semi‐structured interviews were the main method of data collection conducted in 2003/2004. Open, axial and selective coding was used for the analysis to identifying issues.

Findings

Key internal constraints for smaller western firms (mindset of western management and middle management in CEE; and lack of management in CEE with decision‐making authority) related to managements' inability to recognize geographic and psychic distance as major external constraints. Largely overcome by enhancing communication between various functional groups; adapting organizational structure; maintaining frequent communicational; developing partnerships in international joint ventures; finding reliable distributors and commitment from re‐sellers and working with government. While no single international business theory adequately explains this process, there is overwhelming support for the network perspective and international entrepreneurship.

Research limitations/implications

The study is limited by small sample size. The explanatory phase is proposed with further western companies, such as the UK, operating in CEE to identify geographic distance, and additional CEE markets to verify dimensions in this environment.

Practical implications

The paper provides a checklist of strategies for overcoming constraints facing managers of smaller firms, entering emerging markets with geographic distance.

Originality/value

Previous studies, using a European or Nordic viewpoint, fail to identify the constraints associated with large geographic distances. This paper provides practical assistance to managers starting out in CEE from the Asia‐Pacific.

Details

European Business Review, vol. 18 no. 3
Type: Research Article
ISSN: 0955-534X

Keywords

Book part
Publication date: 25 July 2008

Ronald S. Burt

What is the scope of brokerage network to be considered in thinking strategically? Given the value of bridging structural holes, is there value to being affiliated with people or…

Abstract

What is the scope of brokerage network to be considered in thinking strategically? Given the value of bridging structural holes, is there value to being affiliated with people or organizations that bridge structural holes? The answer is “no” according to performance associations with manager networks, which raises a question about the consistency of network theory across micro to macro levels of analysis. The purpose here is to align manager evidence with corresponding macro evidence on the supplier and customer networks around four-digit manufacturing industries in the 1987 and 1992 benchmark input–output tables. In contrast to the manager evidence, about 24% of the industry-structure effect on industry performance can be attributed to structure beyond the industry's own buying and selling, to networks around the industry's suppliers and customers. However, the industry evidence is not qualitatively distinct from the manager evidence so much as it describes a more extreme business environment.

Details

Network Strategy
Type: Book
ISBN: 978-0-7623-1442-3

Book part
Publication date: 8 April 2005

Ricardo Madureira

This paper illuminates the distinction between individual and organizational actors in business-to-business markets as well as the coexistence of formal and informal mechanisms of…

Abstract

This paper illuminates the distinction between individual and organizational actors in business-to-business markets as well as the coexistence of formal and informal mechanisms of coordination in multinational corporations. The main questions addressed include the following. (1) What factors influence the occurrence of personal contacts of foreign subsidiary managers in industrial multinational corporations? (2) How such personal contacts enable coordination in industrial markets and within multinational firms? The theoretical context of the paper is based on: (1) the interaction approach to industrial markets, (2) the network approach to industrial markets, and (3) the process approach to multinational management. The unit of analysis is the foreign subsidiary manager as the focal actor of a contact network. The paper is empirically focused on Portuguese sales subsidiaries of Finnish multinational corporations, which are managed by either a parent country national (Finnish), a host country national (Portuguese) or a third country national. The paper suggests eight scenarios of individual dependence and uncertainty, which are determined by individual, organizational, and/or market factors. Such scenarios are, in turn, thought to require personal contacts with specific functions. The paper suggests eight interpersonal roles of foreign subsidiary managers, by which the functions of their personal contacts enable inter-firm coordination in industrial markets. In addition, the paper suggests eight propositions on how the functions of their personal contacts enable centralization, formalization, socialization and horizontal communication in multinational corporations.

Details

Managing Product Innovation
Type: Book
ISBN: 978-1-84950-311-2

1 – 10 of over 22000