290 research outputs found
Fiber design for high-power low-cost Yb:Al-doped fiber laser operating at 980nm
No full textWe investigated an Yb:Al-doped depressed-clad hollow optical fiber (DCHOF) for cladding-pumped 980nm laser operation. With a careful design, the nonzero fundamental-mode cutoff characteristics of a DCHOF allows the competing 1030-1060nm emission to be filtered out, despite being quite close to 980nm. The laser yielded over 3W of output power in a diffraction limited beam (M -parameter degrades to 2.7, as a result of increased cladding-mode lasing, as the cladding thickness is reduced
On Dimensionality of Coordinate-Based Network Distance Mapping
No full textIn this paper, we investigate the veracity of a basic premise, “that network distance is Euclidean”, assumed in a class of recently proposed techniques that embed Internet hosts in a Euclidean space for the purpose of estimating the delay or “distance” between them. Using the classical scaling method on a number of network distance measurement datasets, we observe “non-Euclidean-ness” in the network distance. We find that this “non-Euclideanness” is caused by the clustering effect of Internet hosts. We also observe that the distance between the nodes in the same cluster is significantly more non-Euclidean than the distance between nodes in different clusters. Our correlation dimension based analysis of intrinsic dimensionality of the datasets reveals that the network distances seem to have a fractional dimension between 2 and 3. We observe that further increasing the dimensionality does not improve the accuracy of the embedding in Euclidean space. Motivated by these results, we propose a new hybrid model for embedding the network nodes using only a 2-dimensional Euclidean coordinate system and small adjustment terms. We show that the accuracy of the proposed embedding technique is as good as, if not better than, that of a 7-dimensional Euclidean embedding.Lee, Sanghwan; Zhang, Zhi-Li; Sahu, Sambit; Saha, Debanjan. (2005). On Dimensionality of Coordinate-Based Network Distance Mapping. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/215663
E-Journal of Chemistry from 2007 to 2012: A Bibliometric Study
No full textBibliometric research is a complex area to comprehend and to undertake in which one might expect information about the intricacies of identifying data for a bibliometric study, discussion about what that data means when it has been extracted, as well as details about the assumptions and limitations researchers face when working in the field, will need to consult an alternative source (Haddow, 2010). Now-a-days, bibliometric studies are conducted for a given field of knowledge on specific literature, research output of a prolific author, research productivity of an organization or of an individual journal for a specific range of time. The present study attempts to unfold the publication characteristics of E-Journal of Chemistry which is published by World Wide Web Publications (P) India from the USA
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Design Considerations for Integrated Proxy Servers
No full textProxy servers reduce client access times as well as load on servers and networks by caching frequently accessed web objects. In this paper, we argue that the growing heterogeneity of data stored on web servers coupled with the increasing diversity in application requirements have made existing proxy servers inadequate. We examine the architecture and mechanisms required by integrated proxy servers that address this heterogeneity in application requirements and data characteristics. Finally, we briefly describe the architecture of an integrated proxy server that is currently being built in our research lab
Design Considerations for Integrated Proxy Servers
No full textProxy servers reduce client access times as well as load on servers and networks by caching frequently accessed web objects. In this paper, we argue that the growing heterogeneity of data stored on web servers coupled with the increasing diversity in application requirements have made existing proxy servers inadequate. We examine the architecture and mechanisms required by integrated proxy servers that address this heterogeneity in application requirements and data characteristics. Finally, we briefly describe the architecture of an integrated proxy server that is currently being built in our research lab. 1 Introduction The growth of the Internet and the World Wide Web has enabled an increasing number of users to access vast amounts of information stored at geographically distributed sites. Due to the non-uniformity of information access, however, popular objects create "hot-spots" of server and network load, and thereby significantly increase latency for information access [17]. Pro..
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