The correct behavior of a service composition depends on the appropriate coordination of its services. According to the idea of channelbased coordination, services exchange messages though channels without any knowledge about each other. The Reo coordination language aims at building connectors out of basic channels to implement arbitrarily complex interaction protocols. The activity within a R...

The predominant mechanism used to control access to the underwater acoustic channel is a contention-based collision-avoidance scheme to reserve the shared media, on-demand, before sending data to avoid retransmission costs incurred with collisions. This paper reports analysis of such a mechanism for a simple linear, or backbone, type topology as compared to the use of an a priori allocation of ...

Dynamic spectrum access (DSA) is proposed to deal with the growing shortage of available leased spectrum for wireless communication. We investigate a subset of DSA referred to as dynamic spectrum leasing (DSL). At its core, DSL allows spectrum lease holders and cognitive radios to cooperate in an effort to leverage spatial diversity to improve channel utilization for both parties. In this resea...

Channel coordination in search advertising is an important but complicated managerial decision for both manufacturers and retailers. A manufacturer can sponsor retailers to advertise his products while at the same time compete with them in position auctions. We model a manufacturer and retailers’ cooperation and intra-brand competition in advertising, as well as inter-brand competition with oth...

This article explores the use of haptic feedback for interpersonal communication in Collaborative Virtual Environments. After a detailed presentation of all involved communication mechanisms, we propose the investigation of low level communication approach through the feedthrough mechanism. This channel is used to communicate kinematic information about a partner’s gestures during closely coupl...

In distributed applications based on mobile agents, coordination and synchronization of the actions executed by a team of mobile agents are difficult tasks. The main difficulty comes from the fact that coordination requires the agents to interact with each other in spite of their dynamically changing locations. In this paper we present a mechanism for coordinating mobile agents which handles th...

Recently, the 802.11e Working Group (WG) has proposed the Hybrid Coordination Function (HCF), which has a HCF Controlled Channel Access (HCCA) and an Enhanced Distributed Coordination Access (EDCA), in order to provide QoS in WLANs. In this paper an innovative HCCA-based algorithm, which will be referred to as Power Save Feedback Based Dynamic Scheduler (PS FBDS) providing bounded delays while ...

Based on the distributed heterogeneous cognitive networks (HCNs) structure from the newest 3GPP release for LTE-A/LTE-B, the resource coordinated allocation scheme is researched to improve the spectrum usage efficiency of the system. Firstly, each network gains the channel conditions by learning scheme; then the information interaction and resource coordination process are carried between neigh...

We report the direct observation of dioxygen molecules physisorbed in the nanochannels of a microporous copper coordination polymer by the MEM (maximum entropy method)/Rietveld method, using in situ high-resolution synchrotron x-ray powder diffraction measurements. The obtained MEM electron density revealed that van der Waals dimers of physisorbed O2 locate in the middle of nanochannels and for...

Over the past few years, the design and performance of channel-aware scheduling strategies have attracted huge interest. In the present paper, we examine a somewhat different notion of scheduling, namely coordination of transmissions among base stations, which has received little attention so far. The inter-cell coordination comprises two key elements: (i) interference avoidance and (ii) load b...