scholarly journals ON A GENERALIZED M/G/1 QUEUE WITH SERVICE DEGRADATION/ENFORCEMENT

1998 ◽  
Vol 41 (3) ◽  
pp. 415-429 ◽  
Author(s):  
Nobuko Igaki ◽  
Ushio Sumita ◽  
Masashi Kowada
Keyword(s):  
2012 ◽  
Vol 8 (4) ◽  
pp. 234029 ◽  
Author(s):  
Yujin Lim ◽  
Hak-Man Kim ◽  
Tetsuo Kinoshita

In a microgrid as an energy infrastructure, the vulnerability against jamming attacks is fatal. Thus, the ability to deal with jamming attacks and maintain an acceptable level of service degradation in presence of the attacks is needed. To solve the problem, we propose a traffic rerouting scheme in wireless communication infrastructure for islanded microgrid. We determine disjoint multiple paths as candidates of a detour path and then select the detour path among the candidates in order to reduce the effect of jamming attack and distribute traffic flows on different detour paths. Through performance comparison, we show that our scheme outperforms a conventional scheme in terms of packet delivery ratio and end-to-end delay.


Author(s):  
Alison Harcourt ◽  
George Christou ◽  
Seamus Simpson

The local wireless environment has been the setting for the co-existence of licensed mobile communications operators and unlicensed WiFi Internet access providers. The IEEE802.11 family of standards, developed for WiFi services in the Institute of Electrical and Electronics Engineers (IEEE), has dominated standards-setting. However, the burgeoning demand for mobile access to the Internet has led to competition for space on the spectrum. Left unaddressed, this co-existence has created practical issues of potential territorial incursion, technical interference, and, ultimately, device underperformance and service degradation. The chapter focuses on the IEEE’s efforts to create a co-existence standard in a crowded and highly contested standards-making space. It shows how alternative standards-making organizational contexts, based on licensed spectrum standards traditions, were able to develop and insert co-existence standards for WiFi ahead of the IEEE initiative. The chapter explains how the IEEE developed its 802.11ax co-existence standard in this environment.


2005 ◽  
Vol 24 (1) ◽  
pp. 163-171 ◽  
Author(s):  
Anne-Marie G. Harris ◽  
Geraldine R. Henderson ◽  
Jerome D. Williams

Through an examination of 81 federal court decisions made between 1990 and 2002 involving customers’ allegations of race and/or ethnic discrimination, the authors uncover three emergent dimensions of discrimination: (1) the type of alleged discrimination (subtle or overt), (2) the level of service (degradation or denial), and (3) the existence of criminal suspicion in the alleged discriminatory conduct (present or absent). Using a framework that enables the categorization and aggregation of cases with common themes, the authors demonstrate that real and perceived consumer discrimination remains a problem in the U.S. marketplace, and they conclude that further research is necessary for marketers to address the issue effectively.


2001 ◽  
Vol I.01.1 (0) ◽  
pp. 285-286
Author(s):  
Akihiro ITO ◽  
Kazuhiro SUGIYAMA ◽  
Nobuo SHINOHARA ◽  
Yuji SUGITA ◽  
Shigeo SAKURAI ◽  
...  

2003 ◽  
Vol 46 (4) ◽  
pp. 635-641 ◽  
Author(s):  
Narayana Sastry CHERUVU ◽  
Kwai Shing CHAN ◽  
Gerald Robert LEVERANT

2015 ◽  
Vol 47 (5) ◽  
pp. 679-688 ◽  
Author(s):  
H. M. Nykyforchyn ◽  
H. V. Krechkovs’ka ◽  
A. I. Kutnyi ◽  
O. Z. Student

2021 ◽  
pp. 1-24
Author(s):  
Chun Yui Wong ◽  
Pranay Seshadri ◽  
Ashley Scillitoe ◽  
Andrew Duncan ◽  
Geoffrey T. Parks

Abstract Blades manufactured through flank and point milling will likely exhibit geometric variability. Gauging the aerodynamic repercussions of such variability, prior to manufacturing a component, is challenging enough, let alone trying to predict what the amplified impact of any in-service degradation will be. While rules of thumb that govern the tolerance band can be devised based on expected boundary layer characteristics at known regions and levels of degradation, it remains a challenge to translate these insights into quantitative bounds for manufacturing. In this work, we tackle this challenge by leveraging ideas from dimension reduction to construct low-dimensional representations of aerodynamic performance metrics. These low-dimensional models can identify a subspace which contains designs that are invariant in performance -- the inactive subspace. By sampling within this subspace, we design techniques for drafting manufacturing tolerances and for quantifying whether a scanned component should be used or scrapped. We introduce the blade envelope as a computational manufacturing guide for a blade. In this paper, the first of two parts, we discuss its underlying concept and detail its computational methodology, assuming one is interested only in the single objective of ensuring that the loss of all manufactured blades remains constant. To demonstrate the utility of our ideas we devise a series of computational experiments with the Von Karman Institute's LS89 turbine blade.


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