W model a modular assembly system in which a final assembler outsources some of the assembly task to first-tier suppliers (subassemblers), who produce modules made up of multiple components. The assembler sets module prices it will pay to the subassemblers, the subassemblers set component prices they will pay to suppliers, and then all players choose how much capacity to install, with the minim...

This paper investigates optimal static prices for a finite capacity queueing system serving customers from different classes. We first show that the original multi-class formulation in which the price for each class is a decision variable can be reformulated as a single dimensional problem with the total load as the decision variable. Using this alternative formulation, we prove an upper bound ...

The amplitude-constrained capacity of a scalar Gaussian channel is shown to be achieved by a unique discrete random variable taking on a finite number of values. Necessary and sufficient conditions for the distribution of this random variable are obtained. These conditions permit determination of the random variable and capacity as a function of the constraint value. The capacity of the same Ga...

Channel capacity in a waveguide with mode coupling is limited by a keyhole effect caused by the propagation mechanism. The coupling among the propagating modes reduces the channel rank, and at sufficient distances between the transmitter and receiver, the channel rank converges to 1. Measurements of the received power and channel capacity along a hallway and in rooms beside it, show a decrease ...

We present an information-theoretic approach to obtain an estimate of the number of bits that can be hidden in still images, or, the capacity of the data-hiding channel. We show how addition of the message signal in a suitable transform domain rather than the spatial domain can signiicantly increase the channel capacity. We compare the capacities achievable with diierent decompositions like DCT...

We present a new method for attaching data to digital audio-visual (AV) documents. Our method is steganographic, i.e., a secondary data stream is integrated or embedded into a given host data stream. Using a psychophysic model evaluated on the AV data we perform embedding in a perceptually transparent way. This is, the perceptual quality of the AV document is not altered. An important character...

In this paper we show how the use of real data on vehicular traffic characterization affects the performance of call and handoff management algorithms conceived for hierarchical cellular systems, and designed on the basis of classic traffic distribution and user velocity assumptions. The main contribution of this work is the scenario where these algorithms are analysed. Studies and statistics o...

A checkerboard constraint is a bounded measurable set 2, containing the origin. A binary labeling of the 2 lattice satisfies the checkerboard constraint if whenever 2 is labeled 1, all of the other 2-lattice points in the translate + are labeled 0. Two-dimensional channels that only allow labelings of 2 satisfying checkerboard constraints are studied. Let ( ) be the area of , and let ( ) mean t...

Existing works on building a soliton transmission system only encode information using the imaginary part of the eigenvalue, which fails to make full use of the signal degree-of-freedoms. Motivated by this observation, we make the first step of encoding information using (discrete) spectral amplitudes by proposing analytical noise models for the spectral amplitudes of N -solitons (N ≥ 1). To ou...

This paper addresses the unfairness problem appearing in 802.6-based DQDB MANs. Traffic load demand is characterized as low (below 0.4 of the channel capacity), normal (from 0.4 to 0.9 of the channel capacity) or heavy (greater than 0.9 of the channel capacity). At low loads the 802.6 protocol is acceptably fair. At normal loads, however, the protocol performance is markedly unfair. The unfairn...