Improving Network Performance Through Endpoint Diagnosis And Multipath Communications

Components of networks, and by extension the internet can fail. It is, therefore, important to find the points of failure and resolve existing issues as quickly as possible. Resolution, however, takes time and its important to maintain high quality of service (QoS) for existing clients while it is in progress. In this work, our goal is to provide clients with means of avoiding failures if/when possible to maintain high QoS while enabling them to assist in the diagnosis process to speed up the time to recovery. Fixing failures relies on first detecting that there is one and then identifying where it occurred so as to be able to remedy it. We take a two-step approach in our solution. First, we identify the entity (Client, Server, Network) responsible for the failure. Next, if a failure is identified as network related additional algorithms are triggered to detect the device responsible. To achieve the first step, we revisit the question: how much can you infer about a failure using TCP statistics collected at one of the endpoints in a connection? Using an agent that captures TCP statistics at one of the end points we devise a classification algorithm that identifies the root cause of failures. Using insights derived from this classification algorithm we identify dominant TCP metrics that indicate where/why problems occur. If/when a failure is identified as a network related problem, the second step is triggered, where the algorithm uses additional information that is collected from ``failed\u27\u27 connections to identify the device which resulted in the failure. Failures are also disruptive to user\u27s performance. Resolution may take time. Therefore, it is important to be able to shield clients from their effects as much as possible. One option for avoiding problems resulting from failures is to rely on multiple paths (they are unlikely to go bad at the same time). The use of multiple paths involves both selecting paths (routing) and using them effectively. The second part of this thesis explores the efficacy of multipath communication in such situations. It is expected that multi-path communications have monetary implications for the ISP\u27s and content providers. Our solution, therefore, aims to minimize such costs to the content providers while significantly improving user performance

A First Look at Data Center Network Condition Through the Eyes of PTPmesh

© 2018 IFIP. Increased network latency and packets losses can affect substantially application performance. Due to the scale of data centers, custom network monitoring tools have been developed to measure network latency and packet loss. In our previous work, we used the Precision Time Protocol (PTP) to measure one-way delay and to quantify packet loss ratios, and we proposed PTPmesh as a cloud network monitoring tool. In this work, we provide a better understanding on how to exploit the measurement data offered by PTPmesh and present a detailed analysis of PTPmesh measurements collected in ten data centers from three cloud providers. Our findings reveal different latency, latency variance and packet loss characteristics across data centers. Through our analysis, we showcase the strengths and limitations of PTPmesh as a cloud network monitoring tool. To foster further research in this area, we make our dataset available

Overcoming: Resilience in the Face of Life\u27s Adversity

Table of Contents Features6 | COVID-19 and our response10 | Advocating for race equality20 | 5 questions with Ihab Dorotta, MD24 | Healing, advocating against acid attacks28 | Superman\u27s student support30 | PossAbilities athlete makes U.S. Paralympic team34 | Overcoming addiction Departments4 | From the President: Renewing our commitment12 | News: Clinical and campus news40 | Alumni: Serving in the U.S. and abroad44 | Annual Report: The fiscal year\u27s people and statushttps://scholarsrepository.llu.edu/scope/1218/thumbnail.jp

Future worlds: threats and opportunities for policing and security

An article about the threats and opportunities for policing and security in the future operating environment for public and private sector capabilities and capacities

Promising Practices and Unfinished Business: Fostering Equity and Excellence for Black and Latino Males

Boston Public Schools (BPS) commissioned companion studies as part of its efforts to address achievement gaps for Black and Latino males. The first study revealed the increasing diversity of Black and Latino males and stark opportunity gaps throughout the system that contribute in large part to wide attainment gaps for these students. We hypothesized that in schools doing comparatively better with Black or Latino males than their counterparts, educators would be strategically and comprehensively implementing evidence-based cultural, structural, and instructional practices tailored to meet their the needs and aspirations of these students. Through qualitative case studies of four schools, we identified several cross-cutting themes that provide the district and school leaders with some positive news about effective practices found in all good schools: strong school cultures, professional collaboration, differentiated instruction, and, in the elementary schools, family engagement. While we observed pockets of best practices specific to Black and Latino male education, we also brought to light unfinished business, in that none of the four case study schools had an intentional and comprehensive schoolwide approach to educating Black and Latino males. This lack of intentionality resulted in a paucity of evidence that the school administration and faculty as a whole: (a) know and value students' cultural and linguistic backgrounds; (b) adopt explicit and responsive approaches to race and gender; and (c) develop and implement a comprehensive approach to culturally responsive curriculum and instruction. We posit that lack of knowledge, intentionality, and coherence impedes further progress in educating Black and Latino males, and has implications for educators in schools, for staff members in community partner organizations, and for family members of BPS students

Spartan Daily, September 18, 1989

Volume 93, Issue 11https://scholarworks.sjsu.edu/spartandaily/7871/thumbnail.jp

Recent Advances of Fluid Manipulation Technologies in Microfluidic Paper-Based Analytical Devices (μPADs) toward Multi-Step Assays

Microfluidic paper-based analytical devices (μPADs) have been suggested as alternatives for developing countries with suboptimal medical conditions because of their low diagnostic cost, high portability, and disposable characteristics. Recently, paper-based diagnostic devices enabling multi-step assays have been drawing attention, as they allow complicated tests, such as enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR), which were previously only conducted in the laboratory, to be performed on-site. In addition, user convenience and price of paper-based diagnostic devices are other competitive points over other point-of-care testing (POCT) devices, which are more critical in developing countries. Fluid manipulation technologies in paper play a key role in realizing multi-step assays via μPADs, and the expansion of biochemical applications will provide developing countries with more medical benefits. Therefore, we herein aimed to investigate recent fluid manipulation technologies utilized in paper-based devices and to introduce various approaches adopting several principles to control fluids on papers. Fluid manipulation technologies are classified into passive and active methods. While passive valves are structurally simple and easy to fabricate, they are difficult to control in terms of flow at a specific spatiotemporal condition. On the contrary, active valves are more complicated and mostly require external systems, but they provide much freedom of fluid manipulation and programmable operation. Both technologies have been revolutionized in the way to compensate for their limitations, and their advances will lead to improved performance of μPADs, increasing the level of healthcare around the world. © 2020 by the authors.1

Impulse

Features:[Page 2] InterActive, a multimedia leader with plans to grow[Page 4] SDSU/lnterActive link producing new voice command system[Page 5] South Dakota climate nurtures life[Page 7] Dakota Mobile Hydraulics continues to expand[Page 8] Special Teams president puts SDSU minor to good use[Page 10] Eleanor Baum: challenges for women in engineering[Page 12] Crossman, Borhard named 1992 Distinguished Engineers[Page 13] 1992 Engineering Exploration Days includes inventors\u27 congressDepartments:Faculty:[Page 14] SDSU chosen for NASA JOVE project[Page 16] Retiring professor to run for legislature, finish book on family history[Page 17] University/Industry Technology Service hosts Total Quality Management symposium[Page 18] Computer science professors make mark in academic world[Page 18] Stephen Gold ties in with WAPA[Page 19] Society names Schaefer Outstanding Young Civil Engineer[Page 19] Ayers named Engineering Teacher of the Year[Page 19] Ernest L. Buckley awardStudents:[Page 20] Hundreds attend Engineering Exploration Days[Page 21] Professional awareness conference offered to electrical engineering students[Page 22] ROTC engineering students completing second half of internship[Page 23] SDSU Arnold Air Society serves as national headquarters[Page 24] News shorts[Page 25] Negative tests mean positive news for PaulosBenefactors and Donors[Page 26] College of Engineering alumnus recasts movie stars to SDSU[Page 27] Space Grant Consortium awards scholarships, fellowships[Page 28] Ninth annual phonathon surpasses $100,000 goalALUMNI[Page 29] Mechanical engineering alumnus shares diverse aeronautics experience[Page 30] Ticket to see the world for Larry Rudebusch[Page 30] Tolstedt doubles as cartoonist[Page 31] SDSU grad, students design computer chips[Page 31] Alumni. faculty gather at Burns and McDonnell[Page 32] Hartford named president of company[Page 32] Rick Benson receives Department of Interior award[Page 32] Alumni notes[Page 32] Correction to Winter 1992 Impulsehttps://openprairie.sdstate.edu/coe_impulse/1034/thumbnail.jp

Application of Uncertainty Quantification techniques to CFD simulation of twin entry radial turbines

L'argomento principale della tesi \ue8 l'applicazione delle tecniche di quantificazione dell'incertezza (UQ) alla simulazione numerica (CFD) di turbine radiali twin entry impiegate nella turbosovralimentazione automobilistica. Lo studio approfondito di questo tipo di turbomacchine \ue8 affrontato nel capitolo 3, finalizzato alla comprensione dei principali parametri che caratterizzano e influenzano le prestazioni fluidodinamiche delle turbine twin scroll. Il capitolo 4 tratta di una piattaforma per l'analisi UQ sviluppata internamente tramite il set di strumenti open source \u2018Dakota\u2019. La piattaforma \ue8 stata testata dapprima su un caso di interesse industriale, ovvero un ugello de Laval supersonico (capitolo 5); l'analisi ha evidenziato l'utilizzo pratico delle tecniche di quantificazione dell'incertezza nella previsione delle prestazioni di un ugello affetto da condizioni di fuori progetto con complessit\ue0 fluidodinamica dovuta alla forte non linearit\ue0. L'esperienza maturata con l'approccio UQ ha agevolato l'identificazione di metodi idonei per applicare la propagazione dell\u2019incertezza alla simulazione CFD di turbine radiali twin scroll (capitolo 6). In tal caso sono state studiate e messe in pratica diverse tecniche di quantificazione dell'incertezza al fine di acquisire un'esperienza approfondita sull\u2019attuale stato dell'arte. Il confronto dei risultati ottenuti dai diversi approcci e la discussione dei pro e dei contro relativi a ciascuna tecnica hanno portato a conclusioni interessanti, che vengono proposte come linee guida per future applicazioni di quantificazione dell\u2019incertezza alla simulazione CFD delle turbine radiali. L'integrazione di modelli e metodologie UQ, oggi utilizzati solo da alcuni centri di ricerca accademica, con solutori CFD commerciali consolidati ha permesso di raggiungere l'obiettivo finale della tesi di dottorato: dimostrare all'industria l'elevato potenziale delle tecniche UQ nel migliorare, attraverso distribuzioni di probabilit\ue0, la previsione delle prestazioni relative ad un componente soggetto a diverse fonti di incertezza. Lo scopo dell\u2019attivit\ue0 di ricerca consiste pertanto nel fornire ai progettisti dati prestazionali associati a margini di incertezza che consentano di correlare meglio simulazione e applicazione reale. Per accordi di riservatezza, i parametri geometrici relativi alla turbina twin entry in oggetto sono forniti adimensionali, i dati sensibili sugli assi dei grafici sono stati omessi e nelle figure si \ue8 reso necessario eliminare le legende dei contours ed ogni eventuale riferimento dimensionale.The main topic of the thesis is the application of uncertainty quantification (UQ) techniques to the numerical simulation (CFD) of twin entry radial turbines used in automotive turbocharging. The detailed study of this type of turbomachinery is addressed in chapter 3, aimed at understanding the main parameters which characterize and influence the fluid dynamic performance of twin scroll turbines. Chapter 4 deals with the development of an in-house platform for UQ analysis through \u2018Dakota\u2019 open source toolset. The platform was first tested on a test case of industrial interest, i.e. a supersonic de Laval nozzle (chapter 5); the analysis highlighted the practical use of uncertainty quantification techniques in predicting the performance of a nozzle affected by off-design conditions with fluid dynamic complexity due to strong non-linearity. The experience gained with the UQ approach facilitated the identification of suitable methods for applying the uncertainty propagation to the CFD simulation of twin entry radial turbines (chapter 6). In this case different uncertainty quantification techniques have been investigated and put into practice in order to acquire in-depth experience on the current state of the art. The comparison of the results coming from the different approaches and the discussion of the pros and cons related to each technique led to interesting conclusions, which are proposed as guidelines for future uncertainty quantification applications to the CFD simulation of radial turbines. The integration of UQ models and methodologies, today used only by some academic research centers, with well established commercial CFD solvers allowed to achieve the final goal of the doctoral thesis: to demonstrate to industry the high potential of UQ techniques in improving, through probability distributions, the prediction of the performance relating to a component subject to different sources of uncertainty. The purpose of the research activity is therefore to provide designers with performance data associated with margins of uncertainty that allow to better correlate simulation and real application. Due to confidentiality agreements, geometrical parameters concerning the studied twin entry radial turbine are provided dimensionless, confidential data on axes of graphs are omitted and legends of the contours as well as any dimensional reference have been shadowed