Tasklets: "Better than Best-Effort" Computing

2016 ◽  
Author(s):  
Dominik Schafer ◽  
Janick Edinger ◽  
Justin Mazzola Paluska ◽  
Sebastian VanSyckel ◽  
Christian Becker
Keyword(s):  
Best Effort ◽  
Better Than

GALO: A DEPLOYABLE FRAMEWORK FOR PROVIDING BETTER THAN BEST-EFFORT QUALITY OF SERVICE

2006 ◽  
Vol 07 (03) ◽  
pp. 319-351
Author(s):  
RAHEEM BEYAH ◽  
RAGHUPATHY SIVAKUMAR ◽  
JOHN COPELAND
Keyword(s):  
Quality Of Service ◽  
Significant Contribution ◽  
Peer To Peer ◽  
Area Network ◽  
Wide Area Network ◽  
Application Layer ◽  
Best Effort ◽  
Routing Schemes ◽  
Better Than

In this paper we propose a deployable approach to improving QoS by using a generic, extendable, overlay architecture; the Generalized Application Layer Overlay (GALO). The goals of this work are to 1) create an overlay architecture which allows us to sample specific path quality metrics among different paths; 2) utilize the proposed overlay architecture in order to implement our proposed QoS-based routing schemes, Application Layer Switching (ALSW) and Application Layer Striping (ALST). Perhaps the most significant contribution of this research is that we are able to achieve better than best-effort QoS without modifying intermediate nodes (i.e., routers), thus encouraging immediate deployment. Additionally, this research is performed on an actual wide area network (WAN) testbed, comprised of universities across the nation. Also, we assemble this architecture as a peer-to-peer framework, encouraging collaborating individuals with average workstations to improve the QoS of their traffic.

Towards a better-than-best-effort forwarding service for multimedia flows

1999 ◽  
Vol 6 (4) ◽  
pp. 84-87 ◽  
Author(s):  
K. Jeffay
Keyword(s):  
Best Effort ◽  
Better Than

Perbandingan Metode Antrian Paket HTB dan EDCA Untuk Layanan Multimedia Pada WLAN IEEE 802.11n

2020 ◽  
Vol 3 (2) ◽  
pp. 132-143
Author(s):  
Taufik Hidayat ◽  
Zulfan Zulfan ◽  
Munawir Munawir ◽  
Susmanto Susmanto
Keyword(s):  
Data Transfer ◽  
Mean Value ◽  
Data Packet ◽  
Multimedia Data ◽  
Service Needs ◽  
Wireless Technology ◽  
Delay Test ◽  
Best Effort ◽  
The Impact ◽  
Better Than

The development of wireless technology continues to improve quality and increase the speed of data transfer into one important factor that is considered. Each year, wireless technology users continue to increase and communication service needs also experience tremendous traffic surge. The impact of high traffic intensity of data sent can lead to increased data queue and transient transmission network. The problem of network crunch resulting from a high amount of queue data may affect service performance. To get the solution, in this study was tested using Hierarchy Token Bucket (HTB) and Enhanced Distributed Channel Access (EDCA) on 802.11n wireless network. Queuing tests are performed on four types of traffic: voice, video, best effort (BE) and background (BG). Assessment of QoS of HTB and EDCA is based on throughput and delay parameters. The results obtained from throughput testing of the mean value of each data packet, the results show that the EDCA method is better than HTB method. The best throughput results are given on Best Effort(BE) traffic. While on the delay test by using HTB and EDCA method, obtained the average of EDCA delay smaller in multimedia data packet for Video and Voice. In conclusion, the results show that the EDCA method is better than HTB.

scholarly journals Analisis Karakteristik Teori Antrian Pada Aplikasi Wireless Fidelity Menggunakan Opnet Modeler 14.5

2015 ◽  
Vol 6 (4) ◽  
Author(s):  
Eko Fajar Cahyadi ◽  
Putra Utama Eka Sakti ◽  
Alfin Hikmaturokhman
Keyword(s):  
Quality Of Service ◽  
Packet Delay ◽  
The Internet ◽  
Video Conference ◽  
Best Effort ◽  
End To End Delay ◽  
End To End ◽  
Better Than ◽  
Delay Variation

Abstract. Wi-Fi areas are accessible in many places, it makes it easier to access the Internet rather than using LAN cable. On the other hand, the Internet itself is a best effort network, which means it does not provide Quality of Service (QoS) mechanism and no traffic classification. This study evaluates the performance of three scheduling methods, including FIFO, Priority Queuing (PQ), and Weighted Fair Queuing (WFQ), on video conference, VoIP and FTP services, implemented in ST3 Telkom campus networks. The results of packet end-to-end delay and packet delay variation for VoIP in WFQ theory scenario is better than the others, that is 171,717ms and 0,977ms. While in video conference services, the result of packet end-to-end delay and packet delay variation in WFQ theory is better than other queuing theory as well, 32,495ms and 7,207ms respectively. This is because the WFQ scheduling mechanism has bandwidth allocation that adapts well to the requirements of the services.Keywords: Wi-Fi, QoS, FIFO, PQ, WFQ Abstrak. Area Wi-Fi banyak kita jumpai di berbagai tempat, menjadikannya sebagai media akses internet yang lebih mudah untuk digunakan dibandingkan menggunakan kabel LAN. Di lain sisi, internet sendiri merupakan jaringan yang bersifat best effort, yang berarti tidak menyediakan mekanisme Quality of Service (QoS) dan tidak ada klasifikasi trafik layanan. Penelitian ini mengevaluasi mengenai performansi dari tiga metode scheduling, diantaranya FIFO, Priority Queuing (PQ), dan Weighted Fair Queuing (WFQ), pada layanan video conference, VoIP dan FTP, menggunakan topologi Wi-Fi kampus ST3 Telkom. Nilai packet end-to-end delay dan packet delay variation untuk VoIP pada skenario WFQ lebih baik dibandingkan teori antrian lain, yaitu sebesar 171,717ms dan 0,977ms secara berurutan. Pada video conference, nilai packet end-to-end delay dan packet delay variation WFQ juga lebih baik dibandingkan teori antrian lain, yaitu dengan nilai 32,495ms dan 7,207ms secara berurutan. Hal ini dikarenakan pada WFQ memiliki alokasi bandwidth yang disesuaikan dengan kebutuhan.Kata Kunci: Wi-Fi, QoS, FIFO, PQ, WFQ

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

Localization of immunolabels by electron microscopy and image averaging

1983 ◽  
Vol 41 ◽  
pp. 282-283
Author(s):  
J. Frank ◽  
P.-Y. Sizaret ◽  
A. Verschoor ◽  
J. Lamy
Keyword(s):  
Electron Microscopy ◽  
Single Particle ◽  
Attachment Site ◽  
Uranyl Acetate ◽  
Limulus Polyphemus ◽  
Resolution Limit ◽  
Electron Microscopic ◽  
Image Averaging ◽  
Top View ◽  
Better Than

The accuracy with which the attachment site of immunolabels bound to macromolecules may be localized in electron microscopic images can be considerably improved by using single particle averaging. The example studied in this work showed that the accuracy may be better than the resolution limit imposed by negative staining (∽2nm).The structure used for this demonstration was a halfmolecule of Limulus polyphemus (LP) hemocyanin, consisting of 24 subunits grouped into four hexamers. The top view of this structure was previously studied by image averaging and correspondence analysis. It was found to vary according to the flip or flop position of the molecule, and to the stain imbalance between diagonally opposed hexamers (“rocking effect”). These findings have recently been incorporated into a model of the full 8 × 6 molecule.LP hemocyanin contains eight different polypeptides, and antibodies specific for one, LP II, were used. Uranyl acetate was used as stain. A total of 58 molecule images (29 unlabelled, 29 labelled with antl-LPII Fab) showing the top view were digitized in the microdensitometer with a sampling distance of 50μ corresponding to 6.25nm.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Electron Microscopic Observation of the Longitudinal Organization of Poly (p-Phenylene Terephthalamide) Fibers

1982 ◽  
Vol 40 ◽  
pp. 680-681
Author(s):  
Li Li-Sheng ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Microscopic Observation ◽  
Electron Microscopic Observation ◽  
Electron Microscopic ◽  
Aromatic Polyamides ◽  
Radial Arrangement ◽  
Scanning Electron ◽  
Better Than

The aromatic polyamides form a class of fibers having mechanical properties which are much better than those of aliphatic polyamides. Currently, the accepted morphology of these fibers as proposed by M.G. Dobb, et al. is a radial arrangement of pleated sheets, with the plane of the pleats parallel to the axis of the fiber. We have recently obtained evidence which supports a different morphology of this type of fiber, using ultramicrotomy and ion-thinning techniques to prepare specimens for transmission and scanning electron microscopy.

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