ORCID Profile
0000-0002-7745-0048
Current Organisations
Macquarie University
,
Australian National University
,
Aberystwyth University
,
King Fahd University of Petroleum and Minerals
,
Western Sydney University
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Publisher: The Journal of Rheumatology
Date: 08-2023
Abstract: At the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) 2022 annual meeting, the Collaborative Research Network (CRN) met to present updates on several projects. These included the GRAPPA-Industry biomarker projects, Axial Psoriatic Arthritis Molecular and Clinical Characterisation Study, Axial Involvement in Psoriatic Arthritis Cohort (AXIS) study, and the Health Initiatives in Psoriasis and Psoriatic Arthritis Consortium European States (HIPPOCRATES). The meeting concluded with a discussion on pathways to further academia-industry collaboration.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 07-2021
Publisher: Inderscience Publishers
Date: 2021
Publisher: Emerald
Date: 08-05-2023
DOI: 10.1108/JAAR-08-2022-0215
Abstract: In this study, the authors examine the relationships between market-based regulations and corporate carbon disclosure and carbon performance. The authors also investigate whether these relationships vary across emission-intensive and non-emission intensive industries. The study s le consists of the world's 500 largest companies across most major industries over a recent five-year period. Country-specific random effect multiple regression analysis is used to test empirical models that predict relationships between market-based regulations and carbon disclosure and carbon performance. Results indicate that market-based regulations significantly and positively affect corporate carbon performance. However, market-based regulations do not significantly affect corporate carbon disclosure. This study also finds that the association between regulatory pressures and carbon disclosure and carbon performance varies across emission-intensive and non-emission-intensive industries. The findings of this study have key implications for policymakers, practitioners and future researchers in terms of understanding the factors that drive businesses to increase their carbon performance and disclosure. The study s le consists of only large firms, and future researchers can undertake similar studies with small and medium-sized firms. The results of this study are expected to help business managers to identify the benefits of adopting market-based regulations. Regulators can use this study’s results to evaluate if market-based regulations effectively improve corporate carbon performance and disclosure. Furthermore, stakeholders may use this study to evaluate and improve their businesses' reporting of carbon disclosure and performance. In contrast to current literature that has used command and control regulations as a proxy for regulation, this study uses market-based regulations as a proxy for climate change regulations. In addition, this study uses a more comprehensive measure of carbon disclosure and carbon performance compared to the previous studies. It also uses global multi-sector data from carbon disclosure project (CDP) in contrast to most current studies that use national data from annual reports of s le firms of specific sectors.
Publisher: Springer Science and Business Media LLC
Date: 18-02-2022
DOI: 10.1007/S10479-022-04523-8
Abstract: This paper analyses the volatility transmission between European Global Systemically Important Banks (GSIBs) and implied stock market volatility. A Dynamic Conditional Correlation Generalized Autoregressive Conditional Heteroskedasticity model is applied to determine the dynamic correlation between returns of Europe’s GSIBs and the world’s most prominent measure of market “fear”, the CBOE Volatility Index (VIX). The results identify a higher negative co-relationship between the VIX and GSIB returns during the COVID-19 period compared with the Global Financial Crisis (GFC), with one-day lagged changes in the VIX negatively Granger-causing bank returns. The asymmetric impact of changes in implied volatility is examined by quantile regressions, with the findings showing that in the lower quartile–where extreme negative bank returns are present–jumps in the VIX are highly significant. This effect is more pronounced during COVID-19 than during the GFC. Additional robustness analysis shows that these findings are consistent during the periods of the Swine Flu and Zika virus epidemics.
Publisher: LLC CPC Business Perspectives
Date: 26-12-2019
DOI: 10.21511/PPM.17(4).2019.28
Abstract: The term “big data” characterizes the massive amounts of data generation by the advanced technologies in different domains using 4Vs – volume, velocity, variety, and veracity - to indicate the amount of data that can only be processed via computationally intensive analysis, the speed of their creation, the different types of data, and their accuracy. High-dimensional financial data, such as time-series and space-time data, contain a large number of features (variables) while having a small number of s les, which are used to measure various real-time business situations for financial organizations. Such datasets are normally noisy, and complex correlations may exist between their features, and many domains, including financial, lack the al analytic tools to mine the data for knowledge discovery because of the high-dimensionality. Feature selection is an optimization problem to find a minimal subset of relevant features that maximizes the classification accuracy and reduces the computations. Traditional statistical-based feature selection approaches are not adequate to deal with the curse of dimensionality associated with big data. Cooperative co-evolution, a meta-heuristic algorithm and a ide-and-conquer approach, decomposes high-dimensional problems into smaller sub-problems. Further, MapReduce, a programming model, offers a ready-to-use distributed, scalable, and fault-tolerant infrastructure for parallelizing the developed algorithm. This article presents a knowledge management overview of evolutionary feature selection approaches, state-of-the-art cooperative co-evolution and MapReduce-based feature selection techniques, and future research directions.
Publisher: Emerald
Date: 19-05-2022
DOI: 10.1108/IMEFM-07-2021-0274
Abstract: Because of the growing financial market integration, China’s stock market’s volatility spillover effect has gradually increased. Traditional strategies do not capture stock volatility in dependence and dynamic conditions. Therefore, this study aims to find an effective stochastic model to predict the volatility spillover effect in the dynamic stock markets. To assess the time-varying dynamics and volatility spillover, this study has used an integrated approach of dynamic conditional correlation model, copula and extreme-value theory. A daily log-returns of three leading indices of Pakistan Stock Exchange (PSX) and Shanghai Stock Exchange (SSE) from the period of 2009 to 2019 is used in the modeling of value-at-risk (VaR) for volatility estimation. The Student’s t copula has been selected based on maximum likelihood estimation and Akaike’s information criteria values of all the copulas using the goodness-of-fit test. The model results show stronger dependency between all major portfolios of PSX and SSE, with the parametric value of 0.98. Subsequently, the results of dependence structure positively estimate the spillover effect of SSE over PSX. Furthermore, the back-testing results show that the VaR model performs well at 99% and 95% levels of confidence and gives more accurate estimates upon the maximum level of confidence. This study is helpful for the investment managers to manage the risk associated to portfolios under dependence conditions. Moreover, this study is also helpful for the researchers in the field of financial risk management who are trying to improve the returns by addressing the issues of volatility estimations. This study contributes to the body of knowledge by providing a practical model to manage the volatility spillover effect in dependence conditions between as well as across the financial markets.
Publisher: Emerald
Date: 13-05-2021
Abstract: This study aims to examine the systemic risk contagion in banks from 15 US states using extreme shocks in their distance to risk. The authors contemplate a model that inputs co-exceedances in the base US states’ banking sector as the dependent variable and the co-exceedances in other states’ banking sector (along with other underlying variables of a banking system) as the explanatory variables. The authors find smaller states transmit and receive more systemic shocks than their larger counterparts and larger states exhibit a better shock-resisting capacity than their smaller counterparts. The authors also find that bigger shocks are more contagious than the smaller shocks. This will be the first paper that will investigate the inner linkage of US states’ banking network using three different distance to risk methods, thus providing timely guidance for regulators.
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 11-2019
Publisher: Emerald
Date: 05-08-2019
Abstract: This study aims to investigate the relationship between the quality and volume of carbon emission disclosures (CED) in UK higher educational institutions (HEIs), with an emphasis on the impact of the Higher Education Funding Council of England (HEFCE) carbon reduction target on such disclosures. Based on stewardship theory, this study explores the decision usefulness of the CED by HEIs, i.e. whether a larger volume of CED means that it is more useful to readers and stakeholders. A framework was developed to measure the CED quality. The relationships between CED volume and quality were examined using the ordered probit regression model. CED volume in annual reports and HEFCE carbon reduction target were found to have a significant positive impact on CED quality. There exists a void in research with carbon disclosures by HEIs, an area which has been widely researched with regard to profit-seeking organisations. The study adds to the earlier related studies by its contribution about HEIs to the disclosure literature. The study is distinct in investigating the relationship between volume and quality of CED by HEIs. However, the impact of CED would need to be clear to motivate the HEIs to engage in such disclosure. Thus, future studies should investigate the impact of both volume and quality of CED on reputation. The study recognises that the characteristics of HEIs are distinct from profit-seeking organisations, which have been widely researched in literature. Generalising the research studies on profit-oriented companies for the most publicly funded UK HEIs may mislead any outcome. This study is distinct from the reader’s point of view in exploring whether more CED is more useful in better decision-making.
Publisher: MDPI AG
Date: 16-07-2021
DOI: 10.3390/SU13147954
Abstract: Systemic risk contagion is a key issue in the banking sector in maintaining financial system stability. This study is among the first few to use three different distance-to-risk measures to empirically assess the domestic interbank linkages and systemic contagion risk of the Chinese banking industry, by using bivariate dynamic conditional correlation GARCH model on data collected from eight prominent Chinese banks for the period 2006–2018. The results show a relatively high correlation among almost all the banks, suggesting an interconnectedness among the banks. We found evidence that the banking system is exposed to significant domestic contagion risks arising from systemic defaults. Given that Chinese markets deliver weak signals of forthcoming stress in banking sectors, new policy intervention is crucial to resolve the hidden stress in the system. The results have important policy implications and will provide scholars and policymakers further insight into the risk contagion originating from interbank networks.
Publisher: Emerald
Date: 08-2023
DOI: 10.1108/IJOEM-03-2022-0490
Abstract: The paper aims to investigate the empirical impact of working capital management (WCM) on firm performance (FP) in the emerging markets of Africa. This paper also aims to investigate this relationship during the global financial crisis of 2008 (GFC, 2008). The s le of this study comprises two leading emerging markets in Africa (Egypt and South Africa) based on the MSCI world market classification list for the period 2007–2020. The study employs various regression techniques such as fixed effect and system generalized method of moments. In addition to baseline regressions, the authors applied various preliminary tests and, finally robustness measures. Besides the dependent, independent variables, the study uses firm-level and country macroeconomic-level explanatory variables. The study's results indicate that (1) WCM and FP exhibit a direct relationship and (2) the WCM components such as cash conversion cycle, average collection period and the average age of inventory, have a significant inverse relationship, whereas the average payment period has a direct relationship with FP. The robustness results are assessed based on the selection of an alternative proxy for FP measurement, controlling for industry, country, year effect and the exclusion of the GFC 2008. This study has various implications in terms of theoretical, societal and practical application for practitioners, managers, investors and regulators. In terms of theoretical implications, this is the first study that contributes to the existing body of knowledge in corporate finance and managerial accounting in relation to the examination of this relationship in the African region. Finally, practitioners, including regulators, can benefit from the study's findings while devising investment policies for investors in the region. More specifically, the financial sector conduct authority (FSCA) in South Africa and the financial regulatory authority (FRA) in Egypt can consider these findings to devise financial policies that aim to foster the FP. Society benefits from the study's findings too. The efficient management of the WCM components will raise firm profits and investment opportunities for the society in Egypt and South Africa. A firm with good performance levels will increase salaries and will provide compensation to their employees in terms of bonuses. These compensations are one of the sources for achieving FP, which is evident from existing literature as well in the case of corporate governance studies. These compensations have psychological impacts as well. As society has its basic needs and goods, compensation levels will be tilted less toward societal ethical issues. This study has various distinguishing features, which prior studies mostly lack, as most of these studies are on an in idual country dataset, shorter periods, mixed results, lesser explanatory variables and no country-related control variables. The authors addressed all these challenges and provided robust results based on various measurement alternatives for the African markets. The study's results confirm a direct relationship between WCM and FP for South Africa and Egypt reflecting the emerging markets in Africa.
Publisher: Elsevier BV
Date: 07-2023
Publisher: Wiley
Date: 10-07-2022
DOI: 10.1111/IMJ.15831
Abstract: Gout is a common chronic inflammatory disorder due to monosodium urate deposition, which results in severe inflammatory arthritis. It is particularly common in those of Māori or Pacific Islander heritage. There is a significant number of this at‐risk ethnic group in western Sydney. To determine the healthcare burden of gout in Western Sydney. We characterised patients managed in the emergency departments (EDs) of the four Western Sydney Local Health District (WSLHD) hospitals and those admitted for gout as the primary or secondary diagnosis from 1 January 2017 to 31 December 2018. There were 472 patients managed in ED on 552 occasions at a direct cost to the LHD of A$367 835. Those of Māori or Pacific Islander ethnicity comprised 25.2% ( n = 119/472), while half ( n = 39/80) of those managed in ED for gout on two or more occasions were of Māori or Pacific Islander ethnicity. Overall, 310 patients were admitted with gout as the principal diagnosis on 413 occasions at a cost of A$1.73 million. Seventy‐five (24.2%) of the 310 patients were of Māori or Pacific Islander heritage. A total of 584 WSLHD inpatients had gout as a secondary diagnosis. This was associated with 714 admissions. The disproportionately large healthcare burden of gout in Western Sydney from the relatively small Māori and Pacific Islander population needs attention. Urgent culturally appropriate interventions to address gout are required to address this inequality.
Publisher: Emerald
Date: 22-04-2022
Publisher: Inderscience Publishers
Date: 2020
Publisher: IGI Global
Date: 2021
DOI: 10.4018/IJITPM.2021010102
Abstract: Real-word large-scale optimisation problems often result in local optima due to their large search space and complex objective function. Hence, traditional evolutionary algorithms (EAs) are not suitable for these problems. Distributed EA, such as a cooperative co-evolutionary algorithm (CCEA), can solve these problems efficiently. It can decompose a large-scale problem into smaller sub-problems and evolve them independently. Further, the CCEA population ersity avoids local optima. Besides, MapReduce, an open-source platform, provides a ready-to-use distributed, scalable, and fault-tolerant infrastructure to parallelise the developed algorithm using the map and reduce features. The CCEA can be distributed and executed in parallel using the MapReduce model to solve large-scale optimisations in less computing time. The effectiveness of CCEA, together with the MapReduce, has been proven in the literature for large-scale optimisations. This article presents the cooperative co-evolution, MapReduce model, and associated techniques suitable for large-scale optimisation problems.
Publisher: Informa UK Limited
Date: 08-01-2020
Publisher: Elsevier BV
Date: 09-2014
Publisher: Springer Science and Business Media LLC
Date: 08-05-2020
DOI: 10.1186/S41927-020-00119-6
Abstract: Severe spinal pain is an unusual presentation of gout. Due to its rarity and the difficulty of obtaining joint fluid or tissue for crystal analysis, dual energy computed tomography (DECT) may be a useful imaging modality in the management of axial gout. Two patients independently presented to a major teaching hospital with severe spinal pain subsequently shown to be due to gout. The first patient presented with back pain and fevers and was initially thought to have lumbar facet joint septic arthritis. The second case presented with severe back pain. In both cases, DECT suggested monosodium urate deposition in spinal tissues as the cause of their presentation. Axial gout should be considered in the differential diagnosis of severe spinal pain. A DECT study may be a useful diagnostic tool in the management of spinal gout.
Publisher: Springer Science and Business Media LLC
Date: 02-11-2021
Publisher: Emerald
Date: 03-02-2023
Publisher: Wiley
Date: 22-01-2022
Abstract: To assess the diagnostic accuracy of temporal artery ultrasound compared with temporal artery biopsy and clinical diagnosis in patients with suspected giant cell arteritis (GCA) over 10 years in an Australian center. Patients presenting to Westmead Hospital with possible GCA from March 2011 to December 2020 were retrospectively identified. The following parameters were obtained from the medical record: clinical presentation, inflammatory markers, temporal artery ultrasound findings, and temporal artery biopsy report. Data were assembled in a 2 × 2 table sensitivity and specificity of temporal artery ultrasound compared with temporal artery biopsy and clinical diagnosis were calculated. Over the 10‐year study period, 65 temporal artery ultrasounds were performed in 63 patients (n = 65 61.9% female) with a mean ± standard deviation age of 69.6 ± 12.3 years. Thirteen out of 65 (20%) temporal artery ultrasounds had findings suggestive of GCA. Twenty patients (31.7%) had a clinical diagnosis of GCA irrespective of sonographic or biopsy findings. Compared with temporal artery biopsy, temporal artery ultrasound had a sensitivity of 71.4% and specificity of 93.3%. Compared with clinical diagnosis made by the treating rheumatologist, temporal artery ultrasound had a sensitivity of 55% and specificity of 95.3%. Temporal artery ultrasound is a useful non‐invasive investigation in the assessment of suspected GCA. If positive in the setting of a suggestive clinical presentation, a temporal artery ultrasound probably avoids the need for a temporal artery biopsy. Temporal artery ultrasound could be more widely used in the clinical management of GCA.
Publisher: Springer Science and Business Media LLC
Date: 03-03-2022
Publisher: Elsevier BV
Date: 11-2021
Publisher: Wiley
Date: 30-01-2020
DOI: 10.1002/EJP.1505
Abstract: Sciatica can be a debilitating condition and there is limited guidance on the use of glucocorticoids administered via the oral, intramuscular or intravenous route for this condition. These represent viable treatment options in the primary care setting. To evaluate the evidence on efficacy and harms of oral, IM and IV glucocorticoid administration for sciatica. MEDLINE, EMBASE, CENTRAL, CINAHL, PsycINFO (inception to October 2018) were searched for randomised placebo-controlled trials evaluating oral, IV or IM glucocorticoid administration for sciatica. Two authors extracted outcomes data. Continuous pain and disability outcomes were converted to a 0 (no pain/disability) to 100 (worst pain/disability) scale. Data were pooled using a random effects model. Overall quality of evidence was assessed using GRADE. Primary outcomes were leg pain and disability. Primary follow-up period was the immediate-term (<2 weeks from administration). We also considered adverse events. Nine trials were eligible. One study [n = 27] provided low quality evidence of a small reduction in disability with early administration of oral prednisone (within 1 week) MD -13.4 [-23.3, -3.5] but not for pain MD -2.5 [-16.9, 11.9]. There was low quality evidence from one study [n = 78] of moderate reduction in disability and small reduction in pain with early (within 72 hr of symptom onset) single intramuscular administration of methylprednisolone acetate MD -24.5 [-38.8, -10.2] and -14.0 [-27.4, -0.6], respectively. There were no immediate-term benefits with IV administration. The effects of glucocorticoids on immediate-term leg pain or disability are uncertain. Future large high quality trials are needed to resolve this uncertainty.
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 06-2022
Publisher: The Journal of Rheumatology
Date: 08-2023
Abstract: The Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) leadership congregated for a strategic planning meeting before the 2022 GRAPPA annual meeting in New York, USA. Meeting aims were to review GRAPPA's performance in relation to its 2016 goals and identify successes and areas for further improvement, identify key GRAPPA priorities and activities for the next 5 years, and explore committee structures to best support these aims.
Publisher: Elsevier BV
Date: 11-2023
Publisher: Emerald
Date: 16-07-2021
DOI: 10.1108/IMEFM-11-2020-0555
Abstract: Globally influential Islamic banks from the Middle East and Southeast Asia carry voluminous correspondence banking with banks from China and India, leading to potential spillover effect of contagion among the banks from these regions. This study aims to investigate the Islamic banks systemic risk contagion with major banks from China and India. Having the option pricing theory in the backdrop, the authors calculated three different distance to risk measurements (default, insolvency and capital). The authors have included top six listed globally influential Islamic banks, top seven Indian banks and top eight Chinese banks based on their net asset value. They then measured the banks’ extreme shocks based on the extreme value theory by using the logistic regression model. These extreme shocks helped the authors to map the spillover among the selected banks from multiple regions. The authors have found strong evidences of directional risk spillover among the banks in this s le. Islamic banks are receiving a significant risk spillover from the other s le banks but transmitting less toward the other banks from India and China. Hence, there is strong one-directional risk contagion toward the Islamic banks in the study s le. This research would be particularly useful to the regulators and bankers from emerging and Islamic markets to understand the conniving nature of the crisis by effectively mapping the source, destination and implementation of the shock transmission mechanism of the potential financial contagion. Even though the corresponding banking among the top Islamic banks from the Middle East and Southeast Asian countries, and banks from India and China, is on the rise, the assessment of risk among these banks has been limited. In particular, the authors extended on the extreme value theory to focus on the wider impact of spillover, including significant direction of contagion from non-Islamic banks to Islamic banks.
Location: United Kingdom of Great Britain and Northern Ireland
Location: Saudi Arabia
Location: United States of America
No related grants have been discovered for Tonmoy Choudhury.