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Transf.rmer f.r the Design of.Automatic Control Systems with Pref.lters

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World Journal of.Engineering and Technology 2024年第3期12卷 575-586页

作者： Isaac Hughes john f. O’Brien Department of.Electrical Engineering and Computer Science University of Wyoming Laramie USA

A machine learning model, using the transf.rmer architecture, is used to design a f.edback compensator and pref.lter f.r various simulated plants. The output of.the transf.rmer is a sequence of.compensator and pref.lter parameters. The compensator and pref.lter are linear models, preserving the ability to analyze the system with linear control theory. The input to the network is a window of.recent ref.rence and output samples. The goal of.the transf.rmer is to minimize tracking error at each time step. The plants under consideration range f.om simple to challenging. The more dif.icult plants contain closely spaced, lightly damped, complex conjugate pairs of.poles and zeros. Results are compared to PID controllers tuned f.r a similar crossover f.equency and optimal phase margin. f.r simple plants, the transf.rmer converges to solutions which overly rely on the pref.lter, neglecting the maximization of.negative f.edback. f.r more complex plants, the transf.rmer designs a compensator and pref.lter with more desirable qualities. In all cases, the transf.rmer can start with random model parameters and modif. them to minimize tracking error on the step ref.rence.

关键词： f.edback Machine Learning Compensator Design

Endoscopic ultrasound-guided portal pressure gradient identif.es patients with previously undiagnosed clinically signif.cant portal hypertension

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Portal Hypertension & Cirrhosis 2024年第2期3卷 67-74页

作者： Jerome C.Edelson Scott f.D.Edelson john G.Quiles Cyrus V.Edelson Eric M.Montminy Christian L.Horn john P.Magulick Don C.Rockey Department of.Gastroenterology and Hepatology Brooke Army Medical CenterFort Sam HoustonTexasUSA Department of.Medicine Uniformed Services University of the Health SciencesBethesdaMarylandUSA Department of.Medicine Brooke Army Medical CenterFort Sam HoustonTexasUSA john H.Stroger Jr.Hospital of.Cook County ChicagoIllinoisUSA Digestive Disease Research Center Medical University of South CarolinaCharlestonSouth CarolinaUSA

Aims:Portal hypertension(PH)is a complication of.cirrhosis that leads to hepatic *** the portal pressure gradient(PPG)provides valuable inf.rmation f.r disease assessment,staging,and *** this study,we aimed to report the utilization of.endoscopic ultrasound(EUS)-guided PPG(EUS-PPG)measurements in a real-world ***:This retrospective analysis included patients at a tertiary care center who underwent EUS-PPG between f.bruary 2021 and May *** most common indication was to establish or exclude the diagnosis of.cirrhosis,f.llowed by an assessment of.surgical risk in the setting of.suspected *** demographic and clinical data were collected,and statistical analysis was perf.rmed using the Student's t ***:Eighteen patients underwent *** success was achieved in 17 of.the 18 *** complications were *** mean scores of.Child-Pugh,Model f.r End-Stage Liver Disease-Sodium,and f.brosis-4 scores were 5.1±0.5,9.0±3.0,and 3.7±4.5,*** the 18 patients,two presented with esophageal varices and six with portal hypertensive *** mean PPG was 5.8±4.5 mmHg,and f.ve patients exhibited clinically signif.cant PH(CSPH).Of.the 18 patients,15 underwent concurrent EUS-liver biopsy,which was 100%successf.l and provided diagnostic histology f.r all *** PPG data led to changes in the clinical management of.17 ***:EUS-PPG is saf. and technically *** Child-Pugh score did not correlate well with the presence of.CSPH;however,PPG measurements resulted in changes in the management of.almost all *** studies correlating EUS-PPG with other assessments of.liver diseases are required.

关键词： EUS portal hypertension portal pressure gradient

Business, government, and society : a managerial perspective : text and cases / George A. Steiner, john f. Steiner. 9th ed.

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Human development across the lif.span john S. Dacey, john f. Travers. 5th ed.

2000年

作者： George A. Steiner john f. Steiner.

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Optimization of.Stealthwatch Network Security System f.r the Detection and Mitigation of.Distributed Denial of.Service (DDoS) Attack: Application to Smart Grid System

2002年

作者： john S. Dacey john f. Travers.

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Communications and Network 2024年第3期16卷 108-134页

作者： Emmanuel S. Kolawole Penrose S. Cof.e john H. f.ller Cajetan M. Akujuobi Emmanuel A. Dada Justin f. f.reman Pamela H. Obiomon Electrical and Computer Engineering Department Prairie View A&M University Prairie View TX USA

The Smart Grid is an enhancement of.the traditional grid system and employs new technologies and sophisticated communication techniques f.r electrical power transmission and distribution. The Smart Grid’s communication network shares inf.rmation about status of.its several integrated IEDs (Intelligent Electronic Devices). However, the IEDs connected throughout the Smart Grid, open opportunities f.r attackers to interf.re with the communications and utilities resources or take clients’ private data. This development has introduced new cyber-security challenges f.r the Smart Grid and is a very concerning issue because of.emerging cyber-threats and security incidents that have occurred recently all over the world. The purpose of.this research is to detect and mitigate Distributed Denial of.Service [DDoS] with application to the Electrical Smart Grid System by deploying an optimized Stealthwatch Secure Network analytics tool. In this paper, the DDoS attack in the Smart Grid communication networks was modeled using Stealthwatch tool. The simulated network consisted of.Secure Network Analytic tools virtual machines (VMs), electrical Grid network communication topology, attackers and Target VMs. f.nally, the experiments and simulations were perf.rmed, and the research results showed that Stealthwatch analytic tool is very ef.ective in detecting and mitigating DDoS attacks in the Smart Grid System without causing any blackout or shutdown of.any internal systems as compared to other tools such as GNS3, NeSSi2, NISST f.amework, OMNeT++, INET f.amework, ReaSE, NS2, NS3, M5 Simulator, OPNET, PLC & TIA Portal management Sof.ware which do not have the capability to do so. Also, using Stealthwatch tool to create a security baseline f.r Smart Grid environment, contributes to risk mitigation and sound security hygiene.

关键词： Smart Grid System Distributed Denial of.Service (DDoS) Attack Intrusion Detection and Prevention Systems Detection Mitigation and Stealthwatch

Selling : building partnerships Barton A. Weitz, Stephen B. Castleberry, john f. Tanner, Jr. 5th ed.

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Artif.cial light at night(ALAN) pollution alters bat lunar chronobiology:insights f.om broad-scale long-term acoustic monitoring

丛书名： The Irwin/McGraw-Hill series in marketing

2004年

作者： Barton A. Weitz Stephen B. Castleberry john f. Tanner Jr.

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Ecological Processes 2024年第01期13卷 176-187页

作者： Han Li Pauline Allen Saige Boris Samantha Lagrama Jade Lyons Christina Mills Pauline Moussi Casey Nichols Carter Tacosik Mc Kenzie Tsaousis Nyzaya Livingston Wilson john f.Grider Kevin A.Parker Matina C.Kalcounis-Rueppell Department of.Biology University of Nebraska Omaha Department of.Biology University of North Carolina Greensboro Colorado Parks and Wild-lif. Parker Ecology LLC Department of.Biological Sciences University of Alberta

Background The timing of.behavior and habitat use of.nocturnal animals can be inf.uenced by the lunar cycle in nature. The prevalence of.artif.cial light at night(ALAN) has been recognized as a source of.environmental pol-lution. The interaction between ALAN and the lunar cycle on bat behavior is important f.r understanding anthro-pogenic ef.ects on bats. We utilized a decade(2012–2022) of.acoustic monitoring data collected in North Carolina, United States, to investigate the relationship between bat activity, lunar cycle, and light pollution. We examined whether the amount of.lunar illumination af.ected species-specif.c nightly activity and whether hourly bat activity patterns varied between nights with dif.erent moon phases. We f.rther investigated if.the relationship between bat activity and the lunar cycle might be altered by light *** We f.und that seven bat species showed activity variation across nights in relation to the amount of.moon illumination when ALAN was absent. In general, bats were less active on f.ll moon nights compared to new moon nights. Light pollution interacted with the bat–lunar relationship in f.ve of.the seven species, masking the ef.ect of.the lunar cycle. We identif.ed delayed bat activity patterns on nights with a f.ll or waxing moon in seven species, and light pollution altered that pattern in f.ur species. Overall, ALAN was associated with decreased bat activity inde-pendent of.lunar cycle *** Our study demonstrated that at a broad spatial scale, ALAN negatively af.ected many North American temperate bat species and altered their lunar chronobiology. As light pollution is spreading to historically dark areas and habitats, ALAN might couple with other threats, such as the white-nose syndrome or climate change, to cause cascading damage in the environment that depends on ecosystem services such as pest control provided by bats. We argue that f.rther research and conservation actions are needed to mitigate

关键词： Artif.cial light at night ALAN Bats Chiroptera Chronobiology Light pollution Lunar cycle Moonlight

Managerial perspectives of.scaling up robotic-assisted surgery in healthcare systems:A systematic literature review

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Laparoscopic, Endoscopic and Robotic Surgery 2024年第3期7卷 113-122页

作者： Ravichandran Anitha Komattu Chacko john Gnanadhas Jabarethina Sri Ramachandra f.culty of.Management Sciences Sri Ramachandra Institute of Higher Education and Research(Category-I Deemed to be University)ChennaiIndia

Objectives Robotic-assisted surgery(RAS)is a minimally invasive technique practiced in multiple *** training is essential f.r the acquisition of.RAS *** cost of.RAS is considered to be high,which makes it a burden f.r institutes and unaf.ordable f.r *** systematic literature review(SLR)f.cused on the various RAS training methods applied in dif.erent surgical specialties,as well as the cost elements of.RAS,and was to summarize the opportunities and challenges associated with scaling up *** An SLR was carried out based on the Pref.rred Reporting Items f.r Systematic reviews and Meta-Analyses reporting *** PubMed,EBSCO,and Scopus databases were searched f.r reports f.om January 2018 through January ***-text reviews and research articles in the English language f.om Asia-Pacif.c countries were *** that outlined training and costs associated with RAS were *** The most common training system is the da Vinci *** simulation technique,which includes dry-lab,wet-lab,and virtual reality training,was f.und to be a common and important *** cost of.RAS encompasses the installation and maintenance costs of.the robotic system,the operation theatre rent,personnel cost,surgical instrument and material cost,and other miscellaneous *** synthesis of.SLR revealed the challenges and opportunities regarding RAS training and *** The results of.this SLR will help stakeholders such as decision-makers,inf.uencers,and end users of.RAS to understand the signif.cance of.training and cost in scaling up RAS f.om a managerial *** any healthcare innovation to reach a vast population,cost-ef.ectiveness and standard training are crucial.

关键词： da Vinci system Healthcare Robotic-assisted surgery Robotic surgery Robotic training Robotic surgery cost

What diameter?What height?Inf.uence of.measures of.average tree size on area-based allometric volume relationships

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f.rest Ecosystems 2024年第1期11卷 100-109页

作者： Yilin Wang john A.Kershaw Mark J.Ducey Yuan Sun James B.McCarter Integrated f.rest Mensuration and Systems Analysis Laboratory Faculty of Forestry and Environmental ManagementUniversity of New BrunswickFrederictonNBCanada Department of.Natural Resources and the Environment University of New HampshireDurhamNHUSA College of.f.restry Nanjing Forestry UniversityNanjing210037China Scientif.c Programmer RayonierYuleeFLUSA

Volume is an important attribute used in many f.rest management *** f.om 83 f.xed-area plots located in central New Brunswick,Canada,are used to examine how dif.erent measures of.stand-level diameter and height inf.uence volume prediction using a stand-level variant of.Honer's(1967)volume *** density was included in the models(Volume=f.Diameter,Height,Density))choice of.diameter measure was more important than choice of.height *** density was not included(Volume=f.Diameter,Height)),the opposite was *** models with density included,moment-based estimators of.stand diameter and height perf.rmed better than all other *** models without density,largest tree estimators of.stand diameter and height perf.rmed better than other *** overall best equation used quadratic mean diameter,Lorey's height,and density(root mean square error=5.26 m^3·ha^(-1);1.9%relative error).The best equation without density used mean diameter of.the largest trees needed to calculate a stand density index of.400 and the mean height of.the tallest 400 trees per ha(root mean square error=32.08 m^(3)·ha^(-1);11.8%relative error).The results of.this study have some important implications f.r height subsampling and LiDAR-derived f.rest inventory analyses.

关键词： Allometric relationships Stand structure Volume estimation Stand-level attributes