Learn More
Packet switching of variable-bit-rate real-time video sources is a means for efficient sharing of communication resources while maintaining uniform picture quality. Performance analysis for the statistical multiplexing of such video sources is required as a first step towards assessing the feasibility of packet video. This paper extends our earlier work in(More)
In this paper, we present a nonlinear interpolation scheme for still image resolution enhancement. The algorithm is based on a source model emphasizing the visual integrity of detected edges and incorporates a novel edge fitting operator that has been developed for this application. A small neighborhood about each pixel in the low-resolution image is first(More)
We analyze diierent retransmission schemes for Error Control in multicast protocols geared towards real-time, multimedia applications. We discuss why retransmission schemes are not inappropriate for such applications, but in fact can be quite eeective. We present a quantitative analysis of such schemes, as well as simulation results, taking into account(More)
Diseases such as cancer are often related to collaborative effects involving interactions of multiple genes within complex pathways, or to combinations of multiple SNPs. To understand the structure of such mechanisms, it is helpful to analyze genes in terms of the purely cooperative, as opposed to independent, nature of their contributions towards a(More)
| We describe a distributed architecture for managing multicast addresses in the global Internet. A multi-cast address space partitioning scheme is proposed, based on the unicast host address and a per-host address management entity. By noting that port numbers are an integral part of end-to-end multicast addressing we present a single, uniied solution to(More)
We perform frequency-domain analysis in the genomes of various organisms using tricolor spectrograms, identifying several types of distinct visual patterns characterizing specific DNA regions. We relate patterns and their frequency characteristics to the sequence characteristics of the DNA. At times, the spectrogram patterns can be related to the structure(More)
BACKGROUND Genes of advanced organisms undergo alternative splicing, which can be mutually exclusive, in the sense that only one exon is included in the mature mRNA out of a cluster of alternative choices, often arranged in a tandem array. In many cases, however, the details of the underlying biologic mechanisms are unknown. RESULTS We describe 'variable(More)
An architecture and associated protocols are presented for managing multicast addresses and performing connection control for applications that use multicast communication facilities. A scheme to partition the multicast address space on the basis of the network number is proposed (an underlying IP-based internetworking environment is assumed), and its(More)