6,789 research outputs found
8.07.001: "The Pink, White and Green" dedicated to Don Walsh by Al Pittman, February 1999
No full textSigned by the author. While this copy is dedicated to Don Walsh, the original poem was dedicated to his brother Des, as indicated below the title
Estimation and Removal of Clock Skew from Network Delay Measurements
No full textPacket delay and loss traces are frequently used by network engineers, as well as network applications, to analyze network performance. The clocks on the end-systems used to measure the delays, however, are not always synchronized, and this lack of synchronization reduces the accuracy of these measurements. Therefore, estimating and removing relative skews and offsets from delay measurements between sender and receiver clocks are critical to the accurate assessment and analysis of network performance. In this paper we introduce a linear programming-based algorithm to estimate the clock skew in network delay measurements and compare it with three other algorithms. We show that our algorithm has time complexity of O(N), leaves the delay after the skew removal positive, and is robust in the sense that the error margin of the skew estimate is independent of the magnitude of the skew. We use traces of real Internet delay measurements to assess the algorithm, and compare its performance to t..
Measurement and Modelling of the Temporal Dependence in Packet Loss
No full textUnderstanding and modelling packet loss in the Internet is especially relevant for the design and analysis of delay-sensitive multimedia applications. In this paper, we present analysis of 128 hours of endto -end unicast and multicast packet loss measurement. From these we selected 76 hours of stationary traces for further analysis. We consider the dependence as seen in the autocorrelation function of the original loss data as well as the dependence between good run lengths and loss run lengths. The correlation timescale is found to be 1000ms or less. We evaluate the accuracy of three models of increasing complexity: the Bernoulli model, the 2-state Markov chain model and the k-th order Markov chain model. Out of the 38 trace segments considered, the Bernoulli model was found to be accurate for 7 segments, the 2-state model was found to be accurate for 10 segments. A Markov chain model of order 2 or greater was found to be necessary to accurately model the rest of the segments. For th..
Texas Cleaver
Get PDFA journalist, author, and politician, Biggers was born September 27, 1868, in Meridian, Texas, and grew up in a ranching environment. He edited and wrote for several West Texas newspapers, served in the Texas Legislature, and was active in land promotion in West Texas and Eastern New Mexico. He authored several books, including History That Will Never Be Repeated (1901), Pictures Of The Past (1902) [both under the pen name Lan Franks], Cattle Range To Cotton Patch (1905), Shackelford County Sketches (1908), and Our Sacred Monkeys (1933). Don Hampton Biggers died at a rest home in Stephenville on December 11, 1957, a month after his wife's death, Nettie.Volume 3. Number 11
DoS protection for a Pragmatic Multiservice Network Based on Programmable Networks
Get PDFProceedings of First International IFIP TC6 Conference, AN 2006, Paris, France, September 27-29, 2006.We propose a scenario of a multiservice network, based on pragmatic
ideas of programmable networks. Active routers are capable of processing both
active and legacy packets. This scenario is vulnerable to a Denial of Service attack,
which consists in inserting false legacy packets into active routers. We
propose a mechanism for detecting the injection of fake legacy packets into active
routers. This mechanism consists in exchanging accounting information on
the traffic between neighboring active routers. The exchange of accounting information
must be carried out in a secure way using secure active packets. The
proposed mechanism is sensitive to the loss of packets. To deal with this problem
some improvements in the mechanism has been proposed. An important issue
is the procedure for discharging packets when an attack has been detected.
We propose an easy and efficient mechanism that would be improved in future
work.Publicad
Don Gale, author of Francie and the Basket Women,holding a copy of the book, Stephenville
No full textDon Gale, author of Francie and the Basket Women, holding a copy of the children's book which is set in Newfoundland and tells the tale of a little girl, Francie, who runs away from the dentist and hops aboard a train. While on the train Francie meets several basket makers, one of which cure her tooth ache
Billy Goat
Get PDFA journalist, author, and politician, Biggers was born September 27, 1868, in Meridian, Texas, and grew up in a ranching environment. He edited and wrote for several West Texas newspapers, served in the Texas Legislature, and was active in land promotion in West Texas and Eastern New Mexico. He authored several books, including History That Will Never Be Repeated (1901), Pictures Of The Past (1902) [both under the pen name Lan Franks], Cattle Range To Cotton Patch (1905), Shackelford County Sketches (1908), and Our Sacred Monkeys (1933). Don Hampton Biggers died at a rest home in Stephenville on December 11, 1957, a month after his wife's death, Nettie."The Billy Goat : Always Buttin' In.""Published Every Time the Signs are Right which Zodiac Event Occurs About Four Times a Month at Rotan, Fisher County, Texas" -- Cover
Real-time traffic transmissions over the internet
No full textMultimedia applications require the transmission of real-time streams over a network. These streams often exhibit variable bandwidth requirements, and require high bandwidths and guarantees from the network. This creates problems whensuch streams are delivered over the Internet. To solve theseproblems, recently, a small set of differentiated services hasbeen introduced. Among these, Premium Service is suitable fortransmitting real-time stored stream (full knowledge of the streamcharacteristics). It uses a bandwidth allocation mechanism (BAM)based on the stream peak rate. Due to the variable bandwidthrequirement, the peak rate BAM can waste large amount ofbandwidth. In this paper we propose a new BAM that uses lessbandwidth than the peak rate BAM, while providing the sameservice. Our BAM does not affect the real-time stream qualityof service (QoS) and does not require any modification to thePremium Service Architecture. We also introduce several framedropping mechanisms that further reduce bandwidth consumptionsubject to a QoS constraint when coupled with the aboveBAM. The proposed BAM and the dropping mechanisms areevaluated using Motion JPEG and MPEG videos and are shownto be effective in reducing bandwidth requirements. Further, sinceVCR operations are very useful in video streaming, we propose amechanism that introduces these operations in our BAM. Throughsimulations we show the effectiveness of this mechanism
Historical Fiction Author Don Neal Discusses Cold War Activities in Alaska
No full textDuring the Cold War, the USA was concerned that Russia would invade Alaska and American intelligence officers created the Stay Behind Agent Program to counter. At this event, Don Neal, author of the Ben Hunnicutt series that includes Cross Kill, Warhead, and washtub Gold, discusses the Nike missile system, the top-secret anti-espionage campaign Operation Washtub, and other Cold War activities in Alaska
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