Publications

The Internet carries a vast amount and a wide range of content. Some
\nof this content is more popular, and accessed more frequently, than
\nothers. The popularity of content could be quite ephemeral - e.g., a
\nWeb flash crowd - or much more permanent - e.g., google.com's
\nbanner. A direct consequence of the skew in popularity is that, at any
\ntime, a fraction of the information carried over the Internet is
\nredundant.
\n
\nWe make two contributions in this paper. First, we study the
\nfundamental properties of the redundancy in the information carried
\nover the Internet, with a focus on network edges. We collect traffic
\ntraces at two network edge locations -- a large university's access
\nlink serving roughly 50,000 users, and a tier-1 ISP network link
\nconnected to a large data center. We conduct several analyses over
\nthis data: What fraction of bytes are redundant? What is the
\nfrequency at which strings of bytes repeat across different packets?
\nWhat is the overlap in the information accessed by distinct groups of
\nend-users? 
\n
\nSecond, we leverage our measurement observations in the design of a
\nfamily mechanisms for eliminating redundancy in network traffic and
\nimproving the overall network performance. The mechanisms we proposed
\ncan improve the available capacity of single network links as well as
\nbalance load across multiple network links.

Earth and Space Science Open Archive This is a preprint and has not been peer reviewed. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Evaluating a UAV-based mobile sensing system designed to quantify ecosystem-based methaneAuthorsDerekHollenbeckiDKristenManiesiDYangQuanCheniDDennisBaldocchiiDEugenieEuskircheniDLanceChristensenSee all authors Derek HollenbeckiDCorresponding Author• Submitting AuthorUniversity of California MercediDhttps://orcid.org/0000-0002-4782-1370view email addressThe email was not providedcopy email addressKristen ManiesiDGeology, Minerals, Energy, and Geophysics Science CenteriDhttps://orcid.org/0000-0003-4941-9657view email addressThe email was not providedcopy email addressYangQuan CheniDUniversity of California MercediDhttps://orcid.org/0000-0002-7422-5988view email addressThe email was not providedcopy email addressDennis BaldocchiiDUniversity of California BerkeleyiDhttps://orcid.org/0000-0003-3496-4919view email addressThe email was not providedcopy email addressEugenie EuskircheniDUniversity of Alaska FairbanksiDhttps://orcid.org/0000-0002-0848-4295view email addressThe email was not providedcopy email addressLance ChristensenNASA Jet Propulsion Laboratoryview email addressThe email was not providedcopy email address

Time synchronization is necessary in many distributed systems, but achieving synchronization in sensornets, which combine stringent precision requirements with severe resource constraints, is particularly challenging. This challenge has been met by the recent Reference-Broadcast Synchronization (RBS) proposal, which provides ondemand pairwise synchronization with low overhead and high precision. In this paper we introduce a model of the basic RBS synchronization paradigm that treats clock offset and clock skew on different time scales. Within the context of this model we derive the optimally precise and globally consistent clock synchronization. This approach can be used with any synchronization paradigm that produces pairwise synchronizations with independent errors.

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Department of Electrical Engineering and Computer Science Nagasaki University 1-14, Bunkyo-machi, Nagasaki-shi, 852 Japan E-mail: itoh@itoh.ec.nagasaki-u.ac.jp Department of Electrical Engineering and Computer Sciences University of California, Berkeley CA 94720, USA The communication systems via chaos synchronization are experimentally demonstrated using Chua's circuit.

Previous genetic evidence suggested that the fad8 and fad7 genes of Arabidopsis thaliana encode chloroplast membrane-associated omega-3 desaturases. A putative fad8 cDNA was isolated by heterologous hybridization using a gene encoding an endoplasmic reticulum-localized omega-3 desaturase (fad3) as a probe. The cDNA encodes a protein of 435 amino acid residues with a molecular mass of 50,134 D. Constitutive expression of the cDNA in transgenic plants of a fad7 mutant resulted in genetic complementation of the mutation, indicating that the fad7 and fad8 gene products are functionally equivalent. Expression of the fad8 cDNA in transgenic plants often resulted in the co-suppression of both the endogenous fad7 and fad8 genes in spite of the fact that these two genes share only about 75% nucleotide identity. In contrast to all other known plant desaturases, including fad7, the steady-state level of fad8 mRNA is strongly increased in plants grown at low temperature. This suggests that the role of fad8 is to provide increased omega-3 desaturase activity in plants that are exposed to low growth temperature. The fad8-1 mutation created a premature stop codon 149 amino acids from the amino-terminal end of the fad8 open reading frame, suggesting that this mutation results in a complete loss of fad8 activity.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.