In this study, the authors consider a delay control problem with proportional fair scheduling in time-varying wireless channels. For proportional fairness of transmission rates among users, a congestion control scheme is proposed for guaranteeing both throughput and delay of the wireless network. Specifically, a scheduling weight is introduced to control queue lengths without degrading the thro...

Introduction.........................................................................................................50 Organic farming and the challenge of sustainability ...........................................51 Political ecology as one approach to globalisation and sustainable development....53 Growth without borders ..........................................................................

Background: Schizophrenia constitutes a serious public health problem all over the world. It is one of the leading causes of disability among young adults and prevents them from leading normal productive lives. Methods: We retrospectively studied new cases diagnosed to have schizophrenia (n=211) seen during the period, March 1999 February 2001. Their premorbid personality traits, socio-demograp...

In all societies, people are concerned with social justice. "It's just not right" is a fairly common lament. In these two studies, we interviewed 240 older women, who ranged in age from 50 to 82. We found that most older women (85%) considered their marriages to be fair and equitable. Older women were less concerned about existing inequities than their younger peers. Nonetheless, they were some...

Measurements of the electronic energy loss are presented for (4)He and (7)Li ions channeling along the Si main axial directions at intermediate to high projectile energies. The Barkas effect, an energy-loss enhancement proportional to the third power of the projectile charge at high energies, is clearly separated from other processes. It reaches about 50% for Li ions channeling along the Si [11...

The performance of various GFR (Guaranteed Frame Rate) implementations has been recently studied due to the interest to provide bandwidth guarantees with a simpler implementation than ABR in ATM networks. In this paper we describe and evaluate a scheduling algorithm to provide the GFR service guarantees. The evaluation is performed by simulation using TCP connections. The proposed scheduling is...

Available bandwidth knowledge is very useful to network protocols. Unfortunately, available bandwidth is also very difficult to measure in packet networks, where methods to guarantee and keep track of the bandwidth (eg, weighted fair queuing scheduling) do not work well, for example the Internet. In this paper we are dealing with an available bandwidth sampling technique based on the observatio...