Jaime A. Ramirez, Dalmy F. Carvalho Jr and Elson J. Silva
The purpose of this paper is to present a numerical analysis of the specific absorption rate (SAR) and temperature increase in a three dimensional (3D) anatomical human eye model…
Abstract
Purpose
The purpose of this paper is to present a numerical analysis of the specific absorption rate (SAR) and temperature increase in a three dimensional (3D) anatomical human eye model exposed to electromagnetic (EM) fields at 1.9, 2.4 and 5.1 GHz, in particular devices such as tablets, smart phones, etc., which are based on Wi-Fi and 4G technology.
Design/methodology/approach
A new 3D model of the human eye composed of nine different tissues with a high resolution of 0.5 mm is presented, including a precise definition of the cornea and lens and also distinguishing the cornea from the aqueous humor and the sclera from the retina and choroid. The EM problem is solved from the Maxwell’s equations which gives the electric field and in turn enables the calculation of the SAR in any part of the eye model. The thermal problem is solved from the bioheat (Pennes’) equation taking the SAR as an input of the power dissipated by the EM field. In both cases the finite difference time domain method is employed.
Findings
A plane-wave field located 30 cm away from the eye is considered as the source for the far-field EM exposure. The results for maximum SAR indicate that the smallest value is 0.06 W/kg in the lens for 1.9 GHz whereas the highest value encountered is 0.43 W/kg in the vitreous humor for 5.1 GHz. In the worst case, the maximum SAR in the lens is 0.28 W/kg for 5.1 GHz. In all cases, the SAR values are within the limits defined by international standards. In terms of maximum temperature, the highest value found is 0.01 C in the cornea, aqueous humor and lens for 5.1 GHz.
Originality/value
The work presents a thorough numerical calculation of the temperature increase in the human eye induced by devices that are based on Wi-Fi and 4G technology operating at 1.9-5.1 GHz.
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Lucia B. Oliveira and Elson Mário Toja Couto Monteiro da Costa
The purpose of this study was to compare and analyze the job satisfaction, organizational commitment and turnover intention of professors, technical-administrative servants and…
Abstract
Purpose
The purpose of this study was to compare and analyze the job satisfaction, organizational commitment and turnover intention of professors, technical-administrative servants and outsourced workers of the Federal University of the State of Rio de Janeiro (UNIRIO).
Design/methodology/approach
The authors conducted analyses of variance, with the multiple comparisons made using Tukey’s post hoc tests, as well as regression analyses. The sample of 297 workers included 115 faculty members, 86 technical-administrative servants and 96 outsourced employees.
Findings
The results showed that the job satisfaction of outsourced workers was significantly higher than that of the public servants. On the other hand, professors presented the highest level of affective commitment, significantly higher than technical-administrative employees and outsourced workers. Turnover intention of outsourced workers was lower than that of technical-administrative employees, despite the stability of the latter group.
Practical implications
From a practical standpoint, the results may guide the development human resource management policies and practices aligned with the reality and the needs of public servants and outsourced employees, thus fostering their job satisfaction, commitment and retention.
Originality/value
This study is relevant given the increased use of outsourced labor in the public administration and the relative paucity of empirical studies with this group of workers, as evidenced by the review of the national literature. Moreover, as the theme of outsourcing is quite controversial, the authors hope this new evidence contributes to the debate.
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The contributions of gender equality to trade and the moderating impact of institutional quality on the trade-gender link have been understudied in contemporary literature…
Abstract
Purpose
The contributions of gender equality to trade and the moderating impact of institutional quality on the trade-gender link have been understudied in contemporary literature. Therefore, this paper aims to use the augmented gravity model to investigate the impacts of gender equality and institutional quality on trade, and the moderating impact of institutional quality on the trade-gender link.
Design/methodology/approach
The panel data is comprised of bilateral trade flows of Vietnam and 40 major trading partners in the 2002–2021 period. Estimation methods include combined fixed effect, random effect, system generalized method of moments two-step (SGMM-II) and Poisson-pseudo maximum likelihood (PPML) which allow the treatment of heterogeneity, endogeneity and heteroskedasticity in the research models.
Findings
The exporting country’s gender equality has an inconclusive impact on trade in SGMM-II and PPML estimations. However, female labor force participation in the exporting country increases trade. Importing country’s gender equality and female labor force participation increase trade. The direct impact of institutional quality on trade is inconclusive, which is dependent on estimation methods. Most noticeably, the institutional quality of exporting and importing countries facilitates the hampering effects of gender equality and female labor force participation on trade.
Research limitations/implications
Future research should apply the framework of this paper to sectoral trade, which allows more sector-specific policy implications to be delivered. Moreover, gender development, gender inequality and institutional quality should be included in the SGMM estimations as endogenous variables for robustness checking purposes in future research.
Practical implications
The paper has justified the integration of gender-specific issues in trade policies, which aligns trade with sustainable development agenda. The explored moderating impact of institutional quality of the exporting country has implied the trade-off relationship between gender equality and export growth in the effort to improve institutional quality. Reversely, in the case of importing countries with higher institutional quality, improved gender equality may mitigate the trade deficit by hampering import growth.
Originality/value
Investigating the impact of gender equality on trade is the prominent contribution of this paper. Gender equality is considered by three component indicators which include gender development, gender inequality and female labor force participation. New measurement approach to the institutional quality level is also introduced. Furthermore, the explored moderating impacts of institutional quality on the trade-gender link are novel in the literature on sustainable development.
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Emerging Economies (EEs) are characterized by sustained growth performance, but they suffer from inequality as well, especially the Gender Inequality. Literature points out a…
Abstract
Emerging Economies (EEs) are characterized by sustained growth performance, but they suffer from inequality as well, especially the Gender Inequality. Literature points out a number of gender norms which play a significant role in aggravating the gender disparity. The chapter chooses a panel of 25 EEs for the period of 2007–2020 to investigate how gender norms can affect the female labor force participation (FLFP) and development relationship. Results suggest that EEs are in a stage of development where even if countries are growing at a reasonable rate, FLFP is falling. Further investigation reveals that skewed sex ratio can dampen the impact of development, whereas secondary school enrollment and legislation to protect women from sexual harassment in the workplace may foster the effect of development. Thus, policies to encourage parents to invest more on the girl child and providing legal support to women at the workplace can be effective policies to reduce gender inequality.
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Bianca-Florentina Nistoroiu, Alina Zaharia and Predrag Vuković
The current research provides an overview of the intersection between female entrepreneurship and development, with a specific focus on the catalyzing role of gender equality. The…
Abstract
The current research provides an overview of the intersection between female entrepreneurship and development, with a specific focus on the catalyzing role of gender equality. The study delves into the manifold implications of empowering women in entrepreneurship and its contributions to socio-economic development. It emphasizes the importance of gender-inclusive policies, access to resources, and equitable opportunities as catalysts for fostering female entrepreneurship and driving sustainable development. By shedding light on the interplay between these critical factors, this research seeks to inform policies and strategies that can promote gender equality, female entrepreneurship, and economic growth.
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Mohammad Moradi and Mohammad Reza Keyvanpour
Image annotation plays an important role in image retrieval process, especially when it comes to content-based image retrieval. In order to compensate the intrinsic weakness of…
Abstract
Purpose
Image annotation plays an important role in image retrieval process, especially when it comes to content-based image retrieval. In order to compensate the intrinsic weakness of machines in performing cognitive task of (human-like) image annotation, leveraging humans’ knowledge and abilities in the form of crowdsourcing-based annotation have gained momentum. Among various approaches for this purpose, an innovative one is integrating the annotation process into the CAPTCHA workflow. In this paper, the current state of the research works in the field and experimental efficiency analysis of this approach are investigated.
Design/methodology/approach
At first, and with the aim of presenting a current state report of research studies in the field, a comprehensive literature review is provided. Then, several experiments and statistical analyses are conducted to investigate how CAPTCHA-based image annotation is reliable, accurate and efficient.
Findings
In addition to study of current trends and best practices for CAPTCHA-based image annotation, the experimental results demonstrated that despite some intrinsic limitations on leveraging the CAPTCHA as a crowdsourcing platform, when the challenge, i.e. annotation task, is selected and designed appropriately, the efficiency of CAPTCHA-based image annotation can outperform traditional approaches. Nonetheless, there are several design considerations that should be taken into account when the CAPTCHA is used as an image annotation platform.
Originality/value
To the best of the authors’ knowledge, this is the first study to analyze different aspects of the titular topic through exploration of the literature and experimental investigation. Therefore, it is anticipated that the outcomes of this study can draw a roadmap for not only CAPTCHA-based image annotation but also CAPTCHA-mediated crowdsourcing and even image annotation.
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Aidan Vining, Mark Moore and Claude Laurin
This paper addresses the social value of commercial enterprises that are jointly owned by a government and private sector investors and where the shares are listed on a stock…
Abstract
Purpose
This paper addresses the social value of commercial enterprises that are jointly owned by a government and private sector investors and where the shares are listed on a stock exchange: thus, “listed public–private enterprises” (LPPEs). The theoretical part of the paper addresses how differences in ownership patterns influence the behavior and performance of LPPEs.
Design/methodology/approach
We develop a conceptual taxonomy, drawing on the empirical evidence on the behavior and performance of public–private hybrid enterprises and on the application of agency theory to that evidence. The taxonomy discussion predicts how different ownership patterns affect enterprise productive efficiency and the ability of governments to achieve social goals through LPPEs. We review the empirical literature on government enterprise ownership and on the concentration of private share ownership to deduce how these matter for owner and managerial behavior and productive efficiency. We review the literature that considers the informational content that listing of an enterprise's shares on a stock exchange can provide to enterprise owners, managers and other domestic audiences with a policy interest. We employ a social welfare perspective to derive policy implications as to when the LPPE governance structure is most appropriate.
Findings
We show how the monitoring and performance weaknesses of state ownership are offset by some private ownership, particularly when combined with listing on a stock exchange. We demonstrate the effects of different governance structures on enterprise productive efficiency. We find that the LPPE structure is particularly appropriate as an alternative to nationalization or to full privatization and regulation of natural monopoly public utilities, and as an alternative to full private ownership and taxation of non-renewable natural resource extractive enterprises.
Originality/value
This paper explicitly addresses the question of why and how the combination of government ownership, private investor ownership and listing on an exchange is socially valuable in providing information on productive efficiency to governments.
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Ashrafee Tanvir Hossain and Lawrence Kryzanowski
The purpose of this paper is to critically review the relevant literature from the perspective of dual-class firms and to provide suggestions for future research on dual-class…
Abstract
Purpose
The purpose of this paper is to critically review the relevant literature from the perspective of dual-class firms and to provide suggestions for future research on dual-class firms, and on methodological issues that should be addressed in such research.
Design/methodology/approach
The research design consists of three parts: an introduction to dual-class firms (motivations for; firm life cycle effects) in Part 1; concerns with firms with such share class structures (valuation; governance; accounting and corporate policy issues) in Part 2; and some solutions or ways to accommodate the trade-offs involved with such share class structures (retention arguments; index/exchange exclusions; contractual provisions; external monitoring) in Part 3. Throughout the paper, the authors provide some critiques of existing studies, particularly from a methodological perspective, the authors’ opinion on the state of the literature and suggestions for future areas of research.
Findings
While motivations for the use of dual-class voting structures include flexibility so that the idiosyncratic vision of their entrepreneurs/founders can be pursued in a less encumbered fashion, greater innovation and long-term managerial orientation, there are many possible costs (e.g. underinvestment and managerial entrenchment) to this ownership structure. Nevertheless, the authors believe that such firms should have provisions in place that facilitate a reversion to a single-class structure longer term when such firms have become more mature, less dependent on the idiosyncratic vision of the entrepreneurs/founders at IPO and have attracted more managerial talent.
Originality/value
The literature arrives at no consensus on the benefits/drawbacks of this type of share ownership structure which means that many topics of research require further academic examination. The authors provide suggested directions for such future enquiries.