Search results

1 – 10 of over 1000
To view the access options for this content please click here
Article

Nesar Ahmad, M.U. Bokhari, S.M.K. Quadri and M.G.M. Khan

The purpose of this research is to incorporate the exponentiated Weibull testing‐effort functions into software reliability modeling and to estimate the optimal software…

Abstract

Purpose

The purpose of this research is to incorporate the exponentiated Weibull testing‐effort functions into software reliability modeling and to estimate the optimal software release time.

Design/methodology/approach

This paper suggests a software reliability growth model based on the non‐homogeneous Poisson process (NHPP) which incorporates the exponentiated Weibull (EW) testing‐efforts.

Findings

Experimental results on actual data from three software projects are compared with other existing models which reveal that the proposed software reliability growth model with EW testing‐effort is wider and effective SRGM.

Research limitations/implications

This paper presents a SRGM using a constant error detection rate per unit testing‐effort.

Practical implications

Software reliability growth model is one of the fundamental techniques to assess software reliability quantitatively. The results obtained in this paper will be useful during the software testing process.

Originality/value

The present scheme has a flexible structure and may cover many of the earlier results on software reliability growth modeling. In general, this paper also provides a framework in which many software reliability growth models can be described.

Details

International Journal of Quality & Reliability Management, vol. 25 no. 2
Type: Research Article
ISSN: 0265-671X

Keywords

To view the access options for this content please click here
Book part

Eiichi Taniguchi and Tadashi Yamada

This paper presents integrated models of probabilistic vehicle routing and scheduling model with time windows and dynamic traffic simulation. The probabilistic model…

Abstract

This paper presents integrated models of probabilistic vehicle routing and scheduling model with time windows and dynamic traffic simulation. The probabilistic model incorporates the uncertainty of travel times. After applying the models to test road network, incorporating the uncertainty of travel times using the models not only allows freight carriers to reduce their total costs, but also improves the environment in terms of decreasing CO2 emissions. As well, the paper investigated the effects and profitability of co-operative freight transport systems using a simulation model based on forecast vehicle routing and scheduling model. Results showed cooperative freight transport systems can lead to a substantial reduction in total delivery costs and total travel times within the whole road network.

Details

The Network Reliability of Transport
Type: Book
ISBN: 978-0-08-044109-2

To view the access options for this content please click here

Abstract

Details

City Logistics
Type: Book
ISBN: 978-0-08-043903-7

To view the access options for this content please click here
Article

N. Ahmad, M.G.M. Khan, S.M.K. Quadri and M. Kumar

The purpose of this research paper is to discuss a software reliability growth model (SRGM) based on the non‐homogeneous Poisson process which incorporates the Burr type X…

Abstract

Purpose

The purpose of this research paper is to discuss a software reliability growth model (SRGM) based on the non‐homogeneous Poisson process which incorporates the Burr type X testing‐effort function (TEF), and to determine the optimal release‐time based on cost‐reliability criteria.

Design/methodology/approach

It is shown that the Burr type X TEF can be expressed as a software development/testing‐effort consumption curve. Weighted least squares estimation method is proposed to estimate the TEF parameters. The SRGM parameters are estimated by the maximum likelihood estimation method. The standard errors and confidence intervals of SRGM parameters are also obtained. Furthermore, the optimal release‐time determination based on cost‐reliability criteria has been discussed within the framework.

Findings

The performance of the proposed SRGM is demonstrated by using actual data sets from three software projects. Results are compared with other traditional SRGMs to show that the proposed model has a fairly better prediction capability and that the Burr type X TEF is suitable for incorporating into software reliability modelling. Results also reveal that the SRGM with Burr type X TEF can estimate the number of initial faults better than that of other traditional SRGMs.

Research limitations/implications

The paper presents the estimation method with equal weight. Future research may include extending the present study to unequal weight.

Practical implications

The new SRGM may be useful in detecting more faults that are difficult to find during regular testing, and in assisting software engineers to improve their software development process.

Originality/value

The incorporated TEF is flexible and can be used to describe the actual expenditure patterns more faithfully during software development.

Details

Journal of Modelling in Management, vol. 4 no. 1
Type: Research Article
ISSN: 1746-5664

Keywords

To view the access options for this content please click here
Book part

Shoko Yamada and Kazuhiro Yoshida

As the sole Asian country in the DAC donor community until South Korea joined in 2010, Japan has been struggling with the pressure to align with the norms and modalities…

Abstract

As the sole Asian country in the DAC donor community until South Korea joined in 2010, Japan has been struggling with the pressure to align with the norms and modalities of the community, while having a different history of aid from Western donors and desiring to be unique. This chapter untangles the domestic and international factors that have affected policy making and implementation of the Japanese Overseas Development Assistance (ODA), particularly in education, at different times in its history. The philosophical foundations of Japanese aid policies are examined in the changing political, economic, and social contexts from the 1950s up to the present.

As the Education for All paradigm took the stage, Japanese education ODA has shifted from the mid-1990s to the mid-2000s to primary education from technical and vocational education and training (TVET) and higher education. However, in the post-2015 process, the policies have swung back to give equal emphasis to TVET and higher education as to basic education, reflecting the global trend to make the agenda more comprehensive. While the convergence with the global trend is clear in Japanese ODA, the hesitant desire to be unique always forces Japanese ODA officials and scholars to discuss and try to demonstrate the “Japanese model” of development and aid.

The chapter also points out that the increased presence of other Asian donors in recent years has made Japanese ODA policies driven more by national interests than by global humanitarianism, which is clearly seen in the Development Cooperation Charter adopted in 2014.

Details

Post-Education-Forall and Sustainable Development Paradigm: Structural Changes with Diversifying Actors and Norms
Type: Book
ISBN: 978-1-78441-271-5

Keywords

To view the access options for this content please click here
Book part

Liv Nyland Krause

The purpose of this chapter is to explore the phenomenon of innovation in a particular setting in Japan, and more specifically to trace a local initiative toward the…

Abstract

Purpose

The purpose of this chapter is to explore the phenomenon of innovation in a particular setting in Japan, and more specifically to trace a local initiative toward the creation of an “innovation ecosystem” in a large city and its surrounding region in Western Japan, with the aim of fostering entrepreneurship and economic revitalization.

Methodology/approach

The analysis in this chapter is based on ethnographic fieldwork, including participant-observation in meetings and events held to promote entrepreneurship and collaboration in the region, as well as interviews with city officials, managers, and entrepreneurs related to the activities of the creation of the “innovation ecosystem.”

Findings

In the chapter, I show how the emergence of the ecosystem metaphor for business innovation informs practices and imaginaries in which relations, co-creation, and natural growth become central as models of and for innovation processes in a context of crisis, in ways that generate not only innovation but the ecosystem itself.

Originality/value

The chapter provides historical and social context to the metaphor of the innovation ecosystem that is receiving increasing interest globally, and provides insights into how innovation activities and the enacting of the “innovation ecosystem” take place in practice.

Details

The Economics of Ecology, Exchange, and Adaptation: Anthropological Explorations
Type: Book
ISBN: 978-1-78635-227-9

Keywords

To view the access options for this content please click here
Book part

Shoko Yamada

This chapter highlights the characteristics of Asia through the analysis of policy-related documents by five donor countries, namely Japan, South Korea, China, India and…

Abstract

This chapter highlights the characteristics of Asia through the analysis of policy-related documents by five donor countries, namely Japan, South Korea, China, India and Thailand. It will also examine the roles played by regional bodies such as the Southeast Asian Ministers of Education Organization (SEAMEO) and ASPBAE (the Asia South Pacific Association for Basic and Adult Education) as the horizontal channels influencing aid policies in respective countries. Together with the analysis of the national and organizational policies, the regional process of building consensus on the post-2015 agenda is examined, with a particular focus on the Asia-Pacific Regional Education Conference (APREC) held in August 2014.

The analysis reveals that the region has two faces: one is imaginary and the other is functional. There is a common trend across Asian donors to refer to their historical ties with regions and countries to which they provide assistance and their traditional notions of education and development. They highlight Asian features in contrast to conventional aid principles and approaches based on the Western value system, either apparently or in a muted manner. In this sense, the imagined community of Asia with common cultural roots is perceived by the policymakers across the board.

At the same time, administratively, the importance of the region as a stage between the national and global levels is recognized increasingly in the multilateral global governance structure. With this broadened participatory structure, as discussed in the chapter ‘Post-EFA Global Discourse: The Process of Shaping the Shared View of the ‘Education Community’’, the expected function of the region to transmit the norms and requests from the global level and to collect and summarize national voices has increased.

Details

Post-Education-Forall and Sustainable Development Paradigm: Structural Changes with Diversifying Actors and Norms
Type: Book
ISBN: 978-1-78441-271-5

Keywords

To view the access options for this content please click here
Article

Koichi Tokuno and Shigeru Yamada

This paper develops a plausible software availability model for operational use. In particular, we consider two kinds of restoration scenarios; one involves the debugging…

Abstract

This paper develops a plausible software availability model for operational use. In particular, we consider two kinds of restoration scenarios; one involves the debugging activity and the other does not involve the debugging activity. The time‐dependent behavior of the software system during the operation phase is described by a Markov process. Several stochastic quantities for software availability measurement are derived from this model. Finally, numerical examples are shown to illustrate software availability analyses.

Details

Journal of Quality in Maintenance Engineering, vol. 4 no. 4
Type: Research Article
ISSN: 1355-2511

Keywords

To view the access options for this content please click here
Article

N. Ahmad, M.G.M. Khan and L.S. Rafi

The purpose of this paper is to investigate how to incorporate the exponentiated Weibull (EW) testing‐effort function (TEF) into inflection S‐shaped software reliability…

Abstract

Purpose

The purpose of this paper is to investigate how to incorporate the exponentiated Weibull (EW) testing‐effort function (TEF) into inflection S‐shaped software reliability growth models (SRGMs) based on non‐homogeneous Poisson process (NHPP). The aim is also to present a more flexible SRGM with imperfect debugging.

Design/methodology/approach

This paper reviews the EW TEFs and discusses inflection S‐shaped SRGM with EW testing‐effort to get a better description of the software fault detection phenomenon. The SRGM parameters are estimated by weighted least square estimation (WLSE) and maximum‐likelihood estimation (MLE) methods. Furthermore, the proposed models are also discussed under imperfect debugging environment.

Findings

Experimental results from three actual data applications are analyzed and compared with the other existing models. The findings reveal that the proposed SRGM has better performance and prediction capability. Results also confirm that the EW TEF is suitable for incorporating into inflection S‐shaped NHPP growth models.

Research limitations/implications

This paper presents the WLSE results with equal weight. Future research may be carried out for unequal weights.

Practical implications

Software reliability modeling and estimation are a major concern in the software development process, particularly during the software testing phase, as unreliable software can cause a failure in the computer system that can be hazardous. The results obtained in this paper may facilitate the software engineers, scientists, and managers in improving the software testing process.

Originality/value

The proposed SRGM has a flexible structure and may capture features of both exponential and S‐shaped NHPP growth models for failure phenomenon.

Details

International Journal of Quality & Reliability Management, vol. 27 no. 1
Type: Research Article
ISSN: 0265-671X

Keywords

To view the access options for this content please click here
Article

Syed Jawad Hussain Shahzad, Peter Josef Stauvermann, Ronald Ravinesh Kumar and Tanveer Ahmad

This study aims to examine the impact of terrorism on return and systematic risk of Pakistan’s equity industries. Daily data from 1 January 2000 to 31 December 2014 for 12…

Abstract

Purpose

This study aims to examine the impact of terrorism on return and systematic risk of Pakistan’s equity industries. Daily data from 1 January 2000 to 31 December 2014 for 12 industries based on the specific types of companies listed on Karachi Stock Exchange are used for the empirical analysis.

Design/methodology/approach

A multiplicative (additive) term is introduced in the standard capital asset pricing model to examine the change in systematic risk (industry returns) in response to the terrorist activities. The authors use the multiscale beta approach (Yamada, 2005) and the maximal overlap discrete wavelet transform (MODWT) to test the heterogeneous market hypothesis.

Findings

Terrorism activities increase the systematic risk for most of the industries and the negative impact on returns of banks and the financial industry. It is noted that terrorism positively impacts (increases) the industrial systematic risk mainly in short-run (between two and four days-time horizon).

Originality/value

The paper examines the impact of terrorism on a broad list of industries’ (banks, basic materials, chemicals, construction, consumer goods, consumer services, financials, industrials, minerals, oil and gas, textile and utilities) risk and return in Pakistan, using the multiscale beta approach (Yamada, 2005) and the MODWT methods.

Details

Accounting Research Journal, vol. 30 no. 4
Type: Research Article
ISSN: 1030-9616

Keywords

1 – 10 of over 1000