Optimal Pricing Strategies for Capacity Leasing Based on Time and Volume Usage in Telecommunication Networks

In this study, we examined optimal pricing strategies for “pay‐per‐time,” “pay‐per‐volume,” and “pay‐per‐both‐time‐and‐volume” based leasing of data networks in a monopoly environment. Conventionally, network capacity distribution includes short‐/long‐term bandwidth and/or usage time leasing. When customers choose connection‐time–based pricing, their rational behavior is to fully utilize the bandwidth capacity within a fixed time period, which may cause the network to burst (or overload). Conversely, when customers choose volume‐based strategies their rational behavior is to send only the minimum bytes necessary (even for time‐fixed tasks for real time applications), causing the quality of the task to decrease, which in turn creates an opportunity cost for the provider. Choosing a pay‐per time and volume hybridized pricing scheme allows customers to take advantage of both pricing strategies while lessening the disadvantages of each, because consumers generally have both time‐ and size‐fixed tasks such as batch data transactions. One of the key contributions of this study is to show that pay‐per both time and volume pricing is a viable and often preferable alternative to the offerings based on only time or volume, and that judicious use of such a pricing policy is profitable to the network provider.     

The Paradoxical Effects of COVID‐19 in Italian Systemic Practice: Clinical and Teaching ‘Insights’

The COVID‐19 pandemic has impacted the personal and professional lives of all of us and has laid the bases for a social and cultural change. This article is written as a reflection on the paradoxical effects of the ‘viral phenomenon.’ We wish to highlight the opportunities and changes that have arisen from the emergency situation, especially through the use of the online setting, both in the clinical work and training activities of systemic therapists. This article is not intended to be a panegyric on the merits of digital sessions, but an appraisal, also through clinical examples, of the contributions that technology may give to our practices. We do not consider technology as a substitute, but as an integration and enrichment of the therapist's and trainer's tools. This tough experience may be transformed into an opportunity for learning new techniques and practices in which the screen becomes a useful support.     

Families in the Time of the Pandemic: Breakdown or Breakthrough?

The COVID‐19 pandemic has taken a toll on all individuals and their families around the world. Some suffer more adversely than others depending on their unique developmental needs, resources, and resilience. However, instead of breaking down, many families and therapists have hunkered down to cope with this ‘wicked’ situation as it continues to evolve. This article examines the unique challenges and opportunities of COVID‐19 for families at different life developmental stages, as well as the challenges and opportunities for systemic therapists as they venture into unfamiliar territory. Through a case example and by integrating recent literature related to this pandemic, we apply three key and interconnected systemic themes (unsafe uncertainty, family life cycle, and social diversity) to discuss the challenges and opportunities for families and therapists, respectively. We are optimistic that there are many possibilities as families and therapists draw on, and often reinvent, currently available resources to navigate their course in this pandemic. We also find that while the pandemic continues to present unsafe and uncertain situations, there are new ways of being and behaving, especially when families and professionals work together collaboratively. Despite formidable challenges, there are many opportunities, both within families and communities that cut through different social contexts related to family, culture, economics, and even politics. Families and therapists could endure better when they are more cognisant of how and what these contexts may impact and offer them.     

Making Black Lives Matter in academia: A Black feminist call for collective action against anti‐blackness in the academy

In this article, as have many Black women scholars in the past, we again call for collective action against anti‐blackness and White supremacy in the academy. Drawing from black feminist theory, we discuss the long history of Black women academics' activism against anti‐black racism and introduce the current movement: Black Lives Matter (BLM). Although BLM is often construed as resisting anti‐black violence outside the academy, it is also relevant for within the academy wherein anti‐blackness is likely to be manifested as disdain, disregard, and disgust for Black faculty and students. We discuss some of the ways in which anti‐blackness and liberal White supremacy are manifested in the lives of Black faculty and students, and propose that non‐Black allies have key roles to play in resisting them. Like second‐hand cigarette smoke that harms everyone in proximity, anti‐blackness and White supremacy harm us all, and a shared movement is needed to dismantle them.     

The ethics of care and academic motherhood amid COVID‐19

The COVID‐19 pandemic has upended the lives of working parents as they strive to meet the conflicting demands of childcare and professional obligations. While growing evidence suggests the extraordinary challenges to time and work brought by the pandemic, this article explores the pandemic as an opportunity for stillness and reflection, a personal and professional recalibration. Through a personal narrative describing my experiences as an academic and mother before and during the pandemic, framed within the ethics of care, this article brings light to the untenable reality of working mothers pre‐pandemic, explores the ways in which the pandemic has positively facilitated caring relationships at home as well as the reallocation of time and household responsibilities, and argues for policy and legislative action at the institutional and societal levels that support and value the care work of women and men alike.     

Freedom or money? The dilemma of migrant live‐in elderly carers in times of COVID‐19

As a consequence of the lockdown measures imposed by the Belgian government to fight against COVID‐19, migrant live‐in elderly carers had to choose between safeguarding their job — at the detriment of their personal freedom, their health and their working conditions — and safeguarding their freedom but losing their job — at the detriment of their economic survival and that of their families. This article explores this dilemma from an intersectionality perspective. In order to understand their experience in times of COVID‐19 and their response to this dilemma, I analyse their position as women, as migrants, as elderly care workers, as family breadwinners and as ‘quasi‐family members’ in the families of their employer — which correspond to five interlocking systems of oppression.     

Sample‐size calculations for multi‐group comparison in population pharmacokinetic experiments

This paper describes an approach for calculating sample size for population pharmacokinetic experiments that involve hypothesis testing based on multi‐group comparison detecting the difference in parameters between groups under mixed‐effects modelling. This approach extends what has been described for generalized linear models and nonlinear population pharmacokinetic models that involve only binary covariates to more complex nonlinear population pharmacokinetic models. The structural nonlinear model is linearized around the random effects to obtain the marginal model and the hypothesis testing involving model parameters is based on Wald's test. This approach provides an efficient and fast method for calculating sample size for hypothesis testing in population pharmacokinetic models. The approach can also handle different design problems such as unequal allocation of subjects to groups and unbalanced sampling times between and within groups. The results obtained following application to a one compartment intravenous bolus dose model that involved three different hypotheses under different scenarios showed good agreement between the power obtained from NONMEM simulations and nominal power. Copyright © 2009 John Wiley & Sons, Ltd.     

Effects of correlation and missing data on sample size estimation in longitudinal clinical trials

In longitudinal clinical trials, a common objective is to compare the rates of changes in an outcome variable between two treatment groups. Generalized estimating equation (GEE) has been widely used to examine if the rates of changes are significantly different between treatment groups due to its robustness to misspecification of the true correlation structure and randomly missing data. The sample size formula for repeated outcomes is based on the assumption of missing completely at random and a large sample approximation. A simulation study is conducted to investigate the performance of GEE sample size formula with small sample sizes, damped exponential family of correlation structure and non‐ignorable missing data. Copyright © 2008 John Wiley & Sons, Ltd.     

Pseudo-empirical Bayes estimation of small area means under a nested error linear regression model with functional measurement errors

Small area estimation is studied under a nested error linear regression model with area level covariate subject to measurement error. Ghosh and Sinha (2007) obtained a pseudo-Bayes (PB) predictor of a small area mean and a corresponding pseudo-empirical Bayes (PEB) predictor, using the sample means of the observed covariate values to estimate the true covariate values. In this paper, we first derive an efficient PB predictor by using all the available data to estimate true covariate values. We then obtain a corresponding PEB predictor and show that it is asymptotically “optimal”. In addition, we employ a jackknife method to estimate the mean squared prediction error (MSPE) of the PEB predictor. Finally, we report the results of a simulation study on the performance of our PEB predictor and associated jackknife MSPE estimator. Our results show that the proposed PEB predictor can lead to significant gain in efficiency over the previously proposed PEB predictor. Area level models are also studied.     

同年关系与北宋"庆历同年党"事件

"庆历同年党"事件是宋仁宗庆历初的宰相吕夷简为排击政敌宋庠等人而精心策划的一起"莫须有"的朋党事件.吕夷简利用了宋庠等人密切的同年关系及仁宗对朋党行为的忌讳心理,将宋庠与几位同年的私交关系指为朋比结党,从而以同年结党的名义将他们逐出朝廷.