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In this work, we consider a large-scale distributed network of servers and a problem of content distribution across it. We propose a novel algorithm, called FastReplica, for an efficient and reliable replication of large files in the Internet environment. There are a few basic ideas exploited in FastReplica. In order to replicate a large file among n nodes(More)
In this paper we consider the downlink power allocation problem for multi-class CDMA wireless networks. We use a utility based power allocation framework to treat multi-class services in a unified way. The goal of this paper is to obtain a power allocation which maximizes the total system utility. In the wireless context, natural utility functions for each(More)
In the paper, we consider the problem of distributing large-size content to a fixed set of nodes. In contrast with the most existing end-system solutions to this problem, FastReplica [1] does not attempt to build a ‘good’ overlay structure, but simply uses a fixed mesh overlay structure. This can significantly reduces the overheads incurred in probing,(More)
In this paper, we investigate the problem of distributively allocating transmission rates to users on the Internet. We allow users to have concave as well as sigmoidal utility functions that are natural in the context of various applications. In the literature, for simplicity, most works have dealt only with the concave case. However, we show that when(More)
As the use of IP multicast sessions becomes widespread, the potential benefits derived from currently unavailable topological information on multicast distribution trees may become increasingly critical. In this paper we propose a framework for discovering the topology of shared multicast trees based on a novel fan-out decrement mechanism analogous to(More)
One of the fundamental and important operations in sensor networks is sink–source matching, i.e. target detection. Target detection is about how a sink finds the location of source nodes observing the event of interest (i.e. target activity). This operation is very important in many sensor network applications such as military battlefield and environment(More)
BACKGROUND/AIMS Cerulein pancreatitis is similar to human edematous pancreatitis with dysregulation of the production and secretion of digestive enzymes, edema formation, cytoplasmic vacuolization and the death of acinar cells. We hypothesized that membrane proteins may be altered as the early event during the induction of acute pancreatitis. Present study(More)
The signaling pathways mediating cytokine production and apoptosis in pancreatic acinar cells have not been fully understood. We investigated the signal transduction of cerulein-induced cytokine IL-6 expression and apoptosis in pancreatic acinar AR42J cells. The wild-type cells and the cells transfected with mutant genes for signaling molecules (such as(More)
In this paper, we present a power scheduling scheme, i.e., a joint time-slot and power allocation method for wireless cellular systems. We allow multiple transmissions in a timeslot that can interfere with each other. Hence, it is important to not only select the mobiles to be scheduled in a time-slot, but also important to allocate an appropriate power(More)