In this paper, channel estimation algorithms are proposed and compared for uplink WiMAX systems, which are OFDMA based. These algorithms are investigated based on a dynamic resource allocation scheme, and it is shown that each of them is suitable to specific system scenarios. For example, for a system with a bandwidth of 10MHz operating in the low frequency region (2-11GHz), a two-dimensional a...

Temporal knowledge representation and reasoning with qualitative temporal knowledge has now been around for several decades, as formalisms such as Allen’s calculus testify. Now a variety of qualitative calculi, both temporal and spatial, has been developed along similar lines to Allen’s calculus. The main object of this paper is to point to open questions which arise when, leaving the now well-...

Planning for the real world requires the ability to sense and reason about an arbitrary number of entities and relations that are not known in advance. However, most satisfaction-based planning systems only reason about a fixed number of given unique fiuents. This article presents the planning model of the constraintbased EXCALIBUR agent’s planning system. The model is based on structural const...

to each other, and f rom these I chose which l ine density and aspect rat io was most pleasing to me. In other experiments, I used different random distributions to determine their artistic effects. I described the results o f these experiments in a Bell Labs technical memorandum entit led "Patterns by 7090," dated 28 August 1962. One pattern, Gaussian-Quadratic (Fig. I ) , was particularly ple...

This paper revises and expands upon a paper presented by two of the present authors at AAAI 1986 [Vilain & Kautz 1986]. As with the original, this revised document considers computational aspects of intervalbased and point-based temporal representations. Computing the consequences of temporal assertions is shown to be computationally intractable in the interval-based representation, but not in ...

CPT is a domain-independent temporal planner that combines a branching scheme based on Partial Order Causal Link (POCL) Planning with powerful and sound pruning rules implemented as constraints. Unlike other recent approaches that build on POCL planning (Nguyen & Kambhampati 2001; Younes & Simmons 2003), CPT is an optimal planner that minimizes makespan. The details of the planner and its under...

This paper reports on a dielectrically actuated and piezoresistively sensed 4.41 GHz silicon bar resonator with an electromechanical Q (Qem) of 8180. The 2-port piezoresistive transconductance measurement performed provides a promising alternative to capacitive measurement at high frequencies, where nominal and feed-through capacitance often dominates the output signal. The electromechanical f·...

Jones et al. in Journal of Experimental Psychology Human Perception and Performance 21:293–307, 1995, showed that a temporal perturbation is easier to detect in a 3:2 polyrhythm than in a single-stream isochronous baseline condition if the two isochronous pulse streams forming the polyrhythm are perceptually integrated: integration creates shorter inter-onset interval (IOI) durations that facil...

Until the early twentieth century the prognosis for patients with acute bacterial meningitis was dismal. Since then, improvements in public health, the discovery of effective antimicrobial agents, the implementation of childhood vaccination programmes and the development of highly specialised acute care facilities have had a dramatic impact on the mortality and morbidity associated with this di...

This paper presents a study of military applications of advanced speech processing technology which includes three major elements: (1) review and assessment of current efforts in military applications of speech technology; (2) identification of opportunities for future military applications of advanced speech technology; and (3) identification of problem areas where research in speech processin...