Search results

1 – 10 of over 10000
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 1 April 1994

Z.R. Hu, P.A. Mawby, M.S. Towers and K. Board

The transient thermal behaviour, based on a rigorous transient thermodynamic treatment, of a power VDMOS transistor during turn‐off is presented. The time variation of the…

41

Abstract

The transient thermal behaviour, based on a rigorous transient thermodynamic treatment, of a power VDMOS transistor during turn‐off is presented. The time variation of the interior lattice temperature within the device is calculated by self‐consistently solving the fully coupled Poisson's equation and transient electron continuity equation together with the transient heat flow equation. The simulation takes account of temperature dependent heat conduction and capacity and includes thermoelectric currents due to temperature gradient. To make the transient thermal simulation more robust, a new analytical expression for heat capacity is used.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 13 no. 4
Type: Research Article
ISSN: 0332-1649

Access Restricted. View access options
Article
Publication date: 1 April 1994

M. Gault, H. Matsuura, K. Furuya, P. Mawby and M.S. Towers

A new quantum effect device which is capable of highly coherent electron emission is theoretically proposed and analysed. The new device works by using the potential induced…

19

Abstract

A new quantum effect device which is capable of highly coherent electron emission is theoretically proposed and analysed. The new device works by using the potential induced accumulation layer at a heterointerface to produce dimensionally reduced electrons. These electrons tunnel through a heterobarrier ensuring that their energy is quantised in the direction of propagation. To avoid the problem of unquantised three dimensional electrons dominating the current the two dimensional electrons that tunnel through the barrier are replenished by electrons from two side contacts. A self‐consistent model is used to analyse the performance of the device and it is found that the new device performs very well, producing electrons with a very narrow energy spread in the direction of propagation. The current density/coherency combination is easily controlled by the applied bias and the device also offers the potential for ultra fast switching through the transition between coherent and incoherent states.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 13 no. 4
Type: Research Article
ISSN: 0332-1649

Access Restricted. View access options
Article
Publication date: 1 April 1994

J. Zeng, P.A. Mawby, M.S. Towers and K. Board

In this paper, the 2‐D numerical analysis is used to investigate the electro‐thermal performance of a trench power VDMOS transistor having a much reduced quasi‐saturation effect…

39

Abstract

In this paper, the 2‐D numerical analysis is used to investigate the electro‐thermal performance of a trench power VDMOS transistor having a much reduced quasi‐saturation effect over the conventional VDMOS structure. Taking into account all the appropriate physical mechanisms, the analysis self‐consistently solves Poisson's equation, the electron continuity equation and the heat flow equation. The results show that the trench structure introduced enables the device to operate at higher current levels due to a favorable change in current density distribution within the device. However, these two effects can increase the self‐heating of the device, decrease the forward current and degrade the thermal stability of the new structure. Nevertheless the new device is still found to provide a higher quasi‐saturation current than the conventional VDMOS device even when thermal effects are taken into account.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 13 no. 4
Type: Research Article
ISSN: 0332-1649

Access Restricted. View access options
Article
Publication date: 1 April 1988

H. SCHWARZENBACH and H. UNGRICHT

Using a simple test‐problem, we compare numerical results for the stationary semiconductor device continuity equation for electrons, obtained by the well known Box‐scheme, by…

51

Abstract

Using a simple test‐problem, we compare numerical results for the stationary semiconductor device continuity equation for electrons, obtained by the well known Box‐scheme, by Zlamal's Finite Element and by van Welij's Finite Element scheme as well as by two new discretization schemes. To interpret these results a classification of the considered schemes is proposed.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 7 no. 4
Type: Research Article
ISSN: 0332-1649

Access Restricted. View access options
Book part
Publication date: 1 March 2012

Abstract

Details

Globalization and Contextual Factors in Accounting: The Case of Germany
Type: Book
ISBN: 978-1-78052-245-6

Access Restricted. View access options
Article
Publication date: 8 March 2022

Brent Lagesse, Shuoqi Wang, Timothy V. Larson and Amy Ahim Kim

The paper aims to develop a particle matter (PM2.5) prediction model for open-plan office space using a variety of data sources. Monitoring of PM2.5 levels is not widely applied…

211

Abstract

Purpose

The paper aims to develop a particle matter (PM2.5) prediction model for open-plan office space using a variety of data sources. Monitoring of PM2.5 levels is not widely applied in indoor settings. Many reliable methods of monitoring PM2.5 require either time-consuming or expensive equipment, thus making PM2.5 monitoring impractical for many settings. The goal of this paper is to identify possible low-cost, low-effort data sources that building managers can use in combination with machine learning (ML) models to approximate the performance of much more costly monitoring devices.

Design/methodology/approach

This study identified a variety of data sources, including freely available, public data, data from low-cost sensors and data from expensive, high-quality sensors. This study examined a variety of neural network architectures, including traditional artificial neural networks, generalized recurrent neural networks and long short-term memory neural networks as candidates for the prediction model. The authors trained the selected predictive model using this data and identified data sources that can be cheaply combined to approximate more expensive data sources.

Findings

The paper identified combinations of free data sources such as building damper percentages and weather data and low-cost sensors such as Wi-Fi-based occupancy estimator or a Plantower PMS7003 sensor that perform nearly as well as predictions made based on nephelometer data.

Originality/value

This work demonstrates that by combining low-cost sensors and ML, indoor PM2.5 monitoring can be performed at a drastically reduced cost with minimal error compared to more traditional approaches.

Access Restricted. View access options
Article
Publication date: 1 August 2018

Chau Ngoc Dang and Long Le-Hoai

The purpose of this paper is to develop several predictive models for estimating the structural construction cost and establish range estimation for the structural construction…

734

Abstract

Purpose

The purpose of this paper is to develop several predictive models for estimating the structural construction cost and establish range estimation for the structural construction cost using design information available in early stages of residential building projects.

Design/methodology/approach

Information about residential building projects is collected based on project documents from construction companies with regard to the design parameters and the actual structural construction costs at completion. Storey enclosure method (SEM) is fundamental for determining the building design parameters, forming the potential variables and developing the cost estimation models using regression analysis. Nonparametric bootstrap method is used to establish range estimation for the structural construction cost.

Findings

A model which is developed from an integration of advanced SEM, principle component analysis and regression analysis is robust in terms of predictability. In terms of range estimation, cumulative probability-based range estimates and confidence intervals are established. While cumulative probability-based range estimates provide information about the level of uncertainty included in the estimate, confidence intervals provide information about the variability of the estimate. Such information could be very crucial for management decisions in early stages of residential building projects.

Originality/value

This study could provide practitioners with a better understanding of the uncertainty and variability included in the cost estimate. Hence, they could make effective improvements on cost-related management approaches to enhance project cost performance.

Details

Engineering, Construction and Architectural Management, vol. 25 no. 7
Type: Research Article
ISSN: 0969-9988

Keywords

Access Restricted. View access options
Article
Publication date: 22 June 2022

Hairul Suhaimi Nahar and Maslinawati Mohamad

This paper aims to fill the governance literature void by answering the seemingly unanswered vintage questions regarding governance reform effectiveness towards ensuring a firm’s

198

Abstract

Purpose

This paper aims to fill the governance literature void by answering the seemingly unanswered vintage questions regarding governance reform effectiveness towards ensuring a firm’s financial reporting transparency (FRT) in an emerging country of Malaysia. It involves an assessment of the specific maintained assumption in its governance code (Code) introduced two decades ago that the Code would improve FRT through the direct channel of governance practices improvement.

Design/methodology/approach

The measured FRT as proxied by the firm’s accruals quality is examined across different governance regimes of pre- and post-Code periods. This paper conjectures that the firm’s FRT should improve post-Code period, evidencing reform effectiveness towards ensuring enhanced governance practices.

Findings

The results indicate that while governance reform improves governance practices, it did not, however, bring improved FRT of firms. The interaction analysis provides evidence of the Code’s ability to favourably moderate the link between the firm’s FRT and several board attributes, suggesting improvement in governance practices in ensuring the firm’s FRT pursuant to the introduction of a formally written and legally backed governance code.

Practical implications

This paper contributes to the extent of governance and FRT literature in developing economies in at least two specific ways. First, the paper presents evidence on public policy implications towards governance practices and the firms’ FRT. Second, it contributes to the public policy debate concerning governance reform effectiveness from the specific angle of the firms’ FRT, thereby confirming the potential conditions upon which the “maintained assumption” would be valid.

Originality/value

This research contributes to the extent of governance and FRT literature in emerging economies by studying the dynamic roles of governance in influencing firms’ FRT across governance regime change, something which governance literature repertoire seems to neglect. It also contributes to the public policy debate concerning governance reform effectiveness from the specific angle of the firm’s FRT by evidencing the strategic role of governance reform in influencing the financial reporting behaviour of Malaysian listed firms.

Details

Journal of Asia Business Studies, vol. 17 no. 3
Type: Research Article
ISSN: 1558-7894

Keywords

Access Restricted. View access options
Article
Publication date: 1 March 2013

Agung Nur Probohudono, Greg Tower and Rusmin Rusmin

The purpose of this paper is to examine voluntary risk disclosures within annual reports in four key South‐East Asian countries' (Indonesia, Malaysia, Singapore, and Australia…

3020

Abstract

Purpose

The purpose of this paper is to examine voluntary risk disclosures within annual reports in four key South‐East Asian countries' (Indonesia, Malaysia, Singapore, and Australia) manufacturing listed companies over the Global Financial Crisis (GFC) 2007‐2009 financial years.

Design/methodology/approach

Longitudinal and cross‐country analyses test the veracity of agency theory to predict the level of firms' risk disclosures. A comprehensive risk disclosure index (RDI) checklist is created with key predictor variables (country, company size, managerial ownership and board independence) tested to explain the dissemination of CSR information over time.

Findings

The findings show that the communication of risk data stays relatively consistent (26‐29 per cent across the three GFC “crisis” years). This is arguably a low level of communication from a social responsibility corporate lens. Multiple regression analysis provides evidence that country, size and board independence are positively significantly associated and leverage is negatively significantly associated with the extent of voluntary risk disclosure. Interestingly, Indonesia, the least developed country with arguably the highest business risk factors, consistently has statistically lower levels of risk disclosure compared with their three neighbours.

Research limitations/implications

The sample frame is selected from the stock exchange population of manufacturing companies in key South‐East Asian countries. However, for complete generalization the findings should be tested in other countries and other industries.

Practical implications

The study findings are useful for firm self‐evaluation and benchmarking of risk communication by other corporations across countries.

Social implications

The study shows relatively low levels of risk disclosure over the GFC crisis time period. Communication of these items are influenced by key firm characteristics and economic drivers. Arguably, higher risk disclosure leads to better understanding of a company's social responsibility stance.

Originality/value

This is a critically important time span to investigate risk disclosures as it encompasses those years most directly impacted by the global financial crisis (GFC).

Access Restricted. View access options
Article
Publication date: 16 September 2013

Agung Nur Probohudono, Greg Tower and Rusmin Rusmin

The purpose of this paper is to provide a comparative analysis of the communication of the five major categories of risk (business, strategy, market and credit risk disclosure…

712

Abstract

Purpose

The purpose of this paper is to provide a comparative analysis of the communication of the five major categories of risk (business, strategy, market and credit risk disclosure) over the volatile 2007-2009 global financial crisis (GFC) time period between Indonesia and Malaysia manufacturing listed companies.

Design/methodology/approach

A total of 300 firm years data are collected consisting of a random sample of 100 manufacturing listed companies’ annual reports for fiscal year-ends from 2007 to 2009. The reports include 50 annual reports of manufacturing companies per country, listed in the stock exchanges of Indonesia and Malaysia for this three-year GFC time period. This research adopts a researcher-constructed risk disclosure index (RDI) to create an index measuring the extent of risk disclosure by listed firms.

Findings

Key findings from statistical analysis are that country of incorporation and size help predict risk disclosure levels. Malaysian companies have significantly higher levels of business risk in 2007 and operating risk communication in 2007, 2008 and 2009 than Indonesian companies. These two countries have similar economic scenarios as developing countries which often have higher “business” risk for companies, but Malaysian companies disclose more risk information than Indonesia. The overall low disclosure levels (27.46-32.92 per cent for Indonesian companies and 35.20-39.04 per cent for Malaysian companies) highlight the potential for far higher communication of key risk factors in these two countries.

Originality/value

This study is important as it contributes to the literature by providing comparative insights into the voluntary risk disclosure practices of manufacturing companies in the two important Asian countries (Indonesia and Malaysia) over the GFC time period. There is lack of risk disclosure studies in manufacturing companies, especially in these two sample countries.

Details

Asian Review of Accounting, vol. 21 no. 3
Type: Research Article
ISSN: 1321-7348

Keywords

1 – 10 of over 10000
Per page
102050