Processor-sharing queues and resource sharing in wireless LANs

In the past few decades, the processor-sharing (PS) model has received considerable attention in the queueing theory community and in the field of performance evaluation of\ud computer and communication systems. The scarce resource is simultaneously shared among all users in these systems. PS models are used for modeling resource sharing mechanisms and have many applications in communication networks, as well as in logistics and manufacturing

Mindfulness-based cognitive therapy v. group psychoeducation for people with generalised anxiety disorder: randomised controlled trial

Background: Research suggests that an 8-week mindfulness-based cognitive therapy (MBCT) course may be effective for generalised anxiety disorder (GAD). Aims: To compare changes in anxiety levels among participants with GAD randomly assigned to MBCT, cognitive–behavioural therapy-based psychoeducation and usual care. Method: In total, 182 participants with GAD were recruited (trial registration number: CUHK_CCT00267) and assigned to the three groups and followed for 5 months after baseline assessment with the two intervention groups followed for an additional 6 months. Primary outcomes were anxiety and worry levels. Results: Linear mixed models demonstrated significant group × time interaction (F(4,148) = 5.10, P = 0.001) effects for decreased anxiety for both the intervention groups relative to usual care. Significant group × time interaction effects were observed for worry and depressive symptoms and mental health-related quality of life for the psychoeducation group only. Conclusions: These results suggest that both of the interventions appear to be superior to usual care for the reduction of anxiety symptoms

Thromboembolic events and hemorrhagic stroke after mRNA (BNT162b2) and inactivated (CoronaVac) covid-19 vaccination : a self-controlled case series study

Background: This study aims to evaluate the association between thromboembolic events and hemorrhagic stroke following BNT162b2 and CoronaVac vaccination. Methods: Patients with incident thromboembolic events or hemorrhagic stroke within 28 days of covid-19 vaccination or SARS-CoV-2 positive test during 23 February to 30 September 2021 were included. The incidence per 100,000 covid-19 vaccine doses administered and SARS-CoV-2 test positive cases were estimated. A modified self-controlled case series (SCCS) analysis using the data from the Hong Kong territory-wide electronic health and vaccination records. Seasonal effect was adjusted by month. Findings: A total of 5,526,547 doses of BNT162b2 and 3,146,741 doses of CoronaVac were administered. A total of 334 and 402 thromboembolic events, and 57 and 49 hemorrhagic stroke cases occurred within 28 days after BNT162b2 and CoronaVac vaccination, respectively. The crude incidence of thromboembolic events and hemorrhagic stroke per 100,000 doses administered for both covid-19 vaccines were smaller than that per 100,000 SARS-CoV-2 test positive cases. The modified SCCS detected an increased risk of hemorrhagic stroke in BNT162b2 14-27 days after first dose with adjusted IRR of 2.53 (95% CI 1.48-4.34), and 0-13 days after second dose with adjusted IRR 2.69 (95% CI 1.54-4.69). No statistically significant risk was observed for thromboembolic events for both vaccines. Interpretation: We detected a possible safety signal for hemorrhagic stroke following BNT162b2 vaccination. The incidence of thromboembolic event or hemorrhagic stroke following vaccination is lower than that among SARS-CoV-2 test positive cases; therefore, vaccination against covid-19 remains an important public health intervention. Funding: This study was funded by a research grant from the Food and Health Bureau, The Government of the Hong Kong Special Administrative Region (reference COVID19F01)

The high court of the people: Popular constitutionalism in hong kong under chinese sovereignty

Popular constitutionalism rarely arises in authoritarian polities. In the absence of genuine elections and referenda, aggrieved and disenfranchised citizens are more likely to resort to extraconstitutional action to defend themselves, to which the regime may respond with decisive suppression. Systemic popular constitutionalism did emerge in Hong Kong, currently under Chinese sovereignty, however. Through coordinated mass resistance based on shared constitutional understandings, large numbers of residents have succeeded in restraining the appointed Hong Kong chief executive from deploying his full range of powers, obliged China to make concessions on electoral reform it would not have made otherwise, and enabled the Basic Law, an imposed constitution, to remain relevant. This article specifies three preconditions under which the residents of Hong Kong have, in the teeth of authoritarianism, managed to adjudge the constitutionality of the acts of the ruling elite with their feet. These preconditions, nevertheless, are idiosyncratic, and may not endure the recent mounting tensions between Hong Kong and China [Correction added on 5 June 2014, after first online publication: the phrase "to authoritarian politic" has been removed from the last statement in the abstract.]. © 2014 The University of Denver/Colorado Seminary.Link_to_subscribed_fulltex