With the subsequent increasing of backbone bandwidth, the full trace capture will be seriously hindered. The research in the paper results from a study analyzing packet traces obtained from a backbone link in CERNET. Millions of packets are passed per minute through the link that makes the traffic measurement difficult or even impossible. Poisson sampling measure proposed by RFC2330 is used in ...

Selection imposed through sperm competition is commonly thought to promote the evolution of longer sperm, since sperm length is assumed to be positively associated with sperm swimming velocity. Yet, the basis for this assumption remains controversial, and there is surprisingly little intraspecific evidence demonstrating such a link between sperm form and function. Here, we show that sperm lengt...

Telomerase activity controls telomere length and plays a pivotal role in stem cells, aging, and cancer. Here, we report a molecular link between Wnt/β-catenin signaling and the expression of the telomerase subunit Tert. β-Catenin-deficient mouse embryonic stem (ES) cells have short telomeres; conversely, ES cell expressing an activated form of β-catenin (β-cat(ΔEx3/+)) have long telomeres. We s...

A cooperative communication in a two-way relay channel is a bidirectional communication between two terminals with the aid of a common relay. In order to improve the performance of the cooperative communication in a two-way relay channel, a network coding can be used to exploit the broadcasting nature of wireless transmission. In [8], it was shown that each individual link can achieve its own c...

This paper proposes an iterative algorithm for estimating the least-cost paths in a wireless sensor network (WSN) that is modeled by a Petri net. We assume that each link between two sensor nodes (each transition in the net) is associated with a positive cost to capture its likelihood (e.g., in terms of the transmission time, distance between nodes, or the link capacity). Given the structure of...

In this paper, conventional global and local indices – structural length index, manipulability measure, condition number and Global Conditioning Index (GCI) – have been examined for the workspace optimization of the sixteen fundamental robot manipulators classified by B. Huang and V. Milenkovic [Kinematics of major robot linkages, Robotics International of SME 2 (1983) 16–31]. To find the optim...

A three-term asymptotic expansion which is controlled by two amplitude parameters is used to describe the stress field in the vicinity of the crack tip in a power-hardening material. The first parameter is the well-known J-integral. The second parameter (amplitude A) can be interpreted as a geometry constraint parameter. A least square procedure is developed for the determination of the amplitu...

Telomerase activity controls telomere length and plays a pivotal role in stem cells, aging, and cancer. Here, we report a molecular link between Wnt/b-catenin signaling and the expression of the telomerase subunit Tert. b-Catenin–deficient mouse embryonic stem (ES) cells have short telomeres; conversely, ES cell expressing an activated form of b-catenin (b-cat) have long telomeres. We show that...