Robert G. Walker

ORCID: 0000-0002-5503-8327
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About
Contact & Profiles
Research Areas
  • Cardiac Arrest and Resuscitation
  • Photonic and Optical Devices
  • Cardiac electrophysiology and arrhythmias
  • Semiconductor Lasers and Optical Devices
  • Advanced Photonic Communication Systems
  • Auditing, Earnings Management, Governance
  • Semiconductor Quantum Structures and Devices
  • Optical Network Technologies
  • Literature: history, themes, analysis
  • Cardiac pacing and defibrillation studies
  • Financial Reporting and Valuation Research
  • American Constitutional Law and Politics
  • Public Policy and Administration Research
  • Cardiac Arrhythmias and Treatments
  • Accounting and Organizational Management
  • Corporate Finance and Governance
  • Cardiac Ischemia and Reperfusion
  • Schizophrenia research and treatment
  • Historical and Literary Studies
  • Trauma and Emergency Care Studies
  • Themes in Literature Analysis
  • Historical Economic and Social Studies
  • Heart Rate Variability and Autonomic Control
  • Preterm Birth and Chorioamnionitis
  • Reformation and Early Modern Christianity

Stryker (United States)
2021-2025

Washington and Jefferson College
2016-2025

St. Elizabeth's Medical Center
2023

Dana-Farber Cancer Institute
2023

Sanford Medical Center
2021

Public Health – Seattle & King County
2021

Nonin Medical (United States)
2021

Johnson Matthey Battery Systems (United Kingdom)
2019-2021

University of Washington
2021

Pontifícia Universidade Católica do Paraná
2019

A description is given of a GaAs-AlGaAs, loaded-line traveling-wave modulator which has achieved bandwidths up to 36 GHz date with low (<6 V) drive voltage into 50 Omega device. The design concept able combine the high efficiency vertical p-i-n-type phase modulators velocity-matched structure obtain very bandwidth/voltage ratios. At 1150 nm, bandwidth 25 for V/sub pi /=4.85 V typically represents performance. 1300 unchanged but higher by expected wavelength-ratio factor. Reduced can be...

10.1109/3.81374 article EN IEEE Journal of Quantum Electronics 1991-03-01

Loss figures for GaAs/GaAlAs heterostructure optical waveguides have been derived from Fabry-Perot cavity resonances. These correlate with the mean guide transmissions within ±0.5 dB 75% of guides measured, losses up to 12 per pass.

10.1049/el:19850411 article EN Electronics Letters 1985-06-20

Background— Minimizing pauses in chest compressions during cardiopulmonary resuscitation is a focus of current guidelines. Prior analyses found that prolonged for defibrillation (perishock pauses) are associated with worse survival. We analyzed resuscitations to characterize the association between all reasons and both ventricular fibrillation termination patient Methods Results— In 319 patients tachycardia/fibrillation out-of-hospital cardiac arrest, we recordings from defibrillators used...

10.1161/circulationaha.115.014016 article EN Circulation 2015-08-08

Background— There is little clear evidence as to the optimal energy levels for initial and subsequent shocks in biphasic waveform defibrillation. The present study compared fixed lower- escalating higher-energy regimens out-of-hospital cardiac arrest. Methods Results— Randomized Controlled Trial Compare Fixed Versus Escalating Energy Regimens Biphasic Waveform Defibrillation (BIPHASIC Trial) was a multicenter, randomized controlled trial of 221 arrest patients who received ≥1 shock given by...

10.1161/circulationaha.106.648204 article EN Circulation 2007-03-13

This article develops a statistical model to explain sources of distress in local government. Whereas ‘financial distress’ the private sector has been equated with failure meet financial commitments, here ‘distress’ is interpreted as an inability maintain pre‐existing levels services community. Since late 1990s councils Australian state (New South Wales) have required estimate cost restoring infrastructure assets satisfactory condition (a requirement which predates that form reporting on...

10.1111/j.1467-6281.2007.00238.x article EN Abacus 2007-08-16

An account of the formation and characterization stripe waveguides formed by silver/sodium ion exchange is given. It shown that variation effective index with guide width can be predicted good accuracy using a computer model to both solve equation obtain refractive profile calculate modes resulting structure. found while use an anodized aluminum mask results in low-loss waveguides, metallic causes deposition silver at edges guide. The experimental methods used for anodization are described detail.

10.1364/ao.22.001923 article EN Applied Optics 1983-06-15

In September 2017, KDIGO (Kidney Disease: Improving Global Outcomes) convened a Controversies Conference titled Blood Pressure in Chronic Kidney Disease (CKD). The purpose of the meeting was to consider which recommendations from 2012 Clinical Practice Guideline for Management CKD should be reevaluated based on new evidence clinical trials. Participants included multidisciplinary panel and scientific experts. Discussions focused optimal means measuring blood pressure (BP) as well managing BP...

10.1016/j.kint.2018.12.025 article EN cc-by-nc-nd Kidney International 2019-04-19

We demonstrate the first integrated realization of a new modulation format-optical DQPSK. Transmission experiments using an encoder tolerance to chromatic dispersion, polarization mode self phase and low OSNR.

10.1109/ofc.2002.1036787 article EN 2002-01-01

Optimal Monophasic and Biphasic Waveforms. Introduction : The truncated exponential waveform from an implantable cardioverter defibrillator can be described by three quantities: the leading edge voltage, duration, time coastant (τ s ). goal of this work was to develop test a mathematical model defibrillation that predicts optimal durations for monophasic first phase biphasic waveforms different τ values. In 1932, Blair used parallel resistor‐capacitor network as cell membrane equation...

10.1111/j.1540-8167.1995.tb00450.x article EN Journal of Cardiovascular Electrophysiology 1995-09-01

Recurrent pregnancy loss (RPL) affects 2-4% of couples, and remains largely unexplained. Recent studies have examined the role cytokines in maintenance normal pregnancy, which is linked with an increased expression Th2 cytokines. Overexpression Th1 associated RPL. Knowing that functional polymorphisms exist for certain cytokines, it has therefore been suggested women RPL may a genetic predisposition to overexpress cytokines.The genes interleukin-1 beta (IL-1beta) tumor necrosis factor alpha...

10.1111/j.8755-8920.2001.450106.x article EN American Journal of Reproductive Immunology 2001-01-01

Conceptual framework documents can be evaluated in terms of four criteria: clarity expression, consistency assumptions with knowledge commercial practices and the behaviour external users accounting information, internal consistency, comprehensiveness as a guide to financial reporting practice. On this basis, Australian Accounting Research Foundation's (AARF’s) Statements Concepts No. 2 (AARF, 1990a), Objectives General Purpose Financial Reporting , is found wanting. SAC inappropriately...

10.1111/j.1467-6281.2003.00137.x article EN Abacus 2003-10-01

Prior to 1930, the upward revaluation of fixed assets was common in United States. By 1940 practice virtually extinct, and for decades thereafter U.S. corporations which were registered with Securities Exchange Commission (SEC) have been constrained both from making asset revaluations, presenting supplementary information about ‘current values’ assets. These changes effected without publication any rules or guidelines by either SEC accounting profession. This paper traces early history...

10.1111/j.1467-6281.1992.tb00267.x article EN Abacus 1992-03-01

Several recently reported studies have considered whether changes in accounting methods by firms whose securities are publicaly traded led to any discernible response the form of shifts share prices. (I) These been framed differing terms, and looked at price movements under a variety conditions. But common finding has that do not appear had much an effect on stock market This paper presents some evidence method which lead It describes examination prices sample relatively large Australian...

10.2307/2490366 article EN Journal of Accounting Research 1975-01-01

Abstract James Robertson (1713 – 95) was born in Dublin but spent most of his life England. By profession a comic actor associated for two decades with the York Theatre, 1770 he published anonymously relatively large volume poetry (239 pages), title Poems, Consisting Tales, Fables, Epigrams, &amp;c. Nobody. His attribution to Nobody playful, but, an irony history, it has turned out be prophetic. Despite relative success this — went through three additional editions lifetime and despite...

10.1215/00982601-11523704 article EN Eighteenth-Century Life 2025-01-01
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