We propose a network access optimization for cognitive radio nodes aimed at throughput maximization under the constraint of primary node queue stability. To maintain primary queue stability, our approach moves beyond the traditional listen-before-talk opportunistic access by allowing cognitive radios to over-hear and utilize ACK/NAK feedback signals on packet reception from the primary receiver...

This paper presents a simple, generic source-based end-to-end multicast congestion control (GSC) algorithm for reliable multicast transport (RMT) protocols. The algorithm is completely implemented at the source and leverages the reverse control information ow in RMT protocols like PGM or RMTP [13,44]. Speci cally, it does not introduce any new control tra c or new elds in RMT protocol headers. ...

The pancreatic  cell has a unique function of converting variations in the extracellular glucose concentration ([G]) to electrical activity, thereby controlling the level of insulin secretion. This signal transduction is dependent on the interaction between energy metabolism and membrane excitation. Several mechanisms have been suggested underlying this bilateral coupling in pancreatic  cells...

BMTP offers rate controlled multicast with reliability, high throughput, and support for large numbers of receivers. A multicast sender needs feedback from receivers to recover from errors and to choose an appropriate send rate, but must avoid being overwhelmed as the number of receivers grows. BMTP does this by keeping the rate at which each receiver sends feedback inversely proportional to a ...

Promising pathways for photoassociative formation of ultracold heteronuclear alkali metal dimers in their lowest rovibronic levels (denoted X(0,0)) are examined using high-quality ab initio calculations of potential energy curves currently available. A promising pathway for KRb, involving the resonant coupling of the 2(1)Pi and 1(1)Pi states just below the lowest excited asymptote (K(4s) + Rb(5...

New applications emerge along with the rapid growth of the Internet. Many functionalities other than packet forwarding are being proposed to be added into routers for supporting those new applications. Those functionalities significantly improve the performances of the applications, but they incur overheads on routers at the same time. It is a thorny problem to reach a balance between the appli...

Habár a Calla palustris L.-nak egy több mint 150 éve gyűjtött hazai herbáriumi példá­nya megtalálható Pécsi Egyetem gyűjteményében (JPU), sok botanikus kétségbe vonja az adat hiteles­ségét. A lapon olvasható be­jegyzés alapján növény egykor Velencei-tavon, Székesfehérvár mellett fordult elő. lap hitelességét ezzel foglalkozó botanikusok része legutóbbi időkig kétkedve fogadta. rendelkezésre áll...

Wireless network analysis and simulations rely on simple yet accurate physical layer models. Two state Markov model, which has been widely used to model bursty communication channels, may be inadequate for the representation of some time-varying channels. In this paper, an analytical model of the Negative Acknowledge (NAK)based selective repeat (SR) Automatic Repeat Request (ARQ) of Radio Link ...

Employees commitments of vision and mission of organization is effected due to manager’s executes by approach of leadership The leaders who have attributions like vision, confidence and correctitude, sharing and participation, creativeness, progressive learning –improvement and responsibility are effective to increase organizational commitment if they are sensitive to expectation and requiremen...