2,074 research outputs found
Gerald M. Phillips\u27 Devotion to Basic Communication Skills
No full textThe passing of Gerald M. Phillips in April 1995 left a void only partially filled by his students and communication scholars familiar with his work. His commitment to basic communication instruction spanned a lifetime of research and service (including Jerry\u27s serving on the editorial board of the Annual over the last two years.)
Julia Wood, long-time colleague, co-author, student and friend, remembers Jerry for his substantial contributions to basic communication instruction and the speech communication field
Simple drag prediction strategies for an Autonomous Underwater Vehicle’s hull shape
No full textThe range of an AUV is dictated by its finite energy source and minimising the energy consumption is required to maximise its endurance. One option to extend the endurance is by obtaining the optimum hydrodynamic hull shape with balancing the trade-off between computational cost and fluid dynamic fidelity. An AUV hull form has been optimised to obtain low resistance hull. Hydrodynamic optimisation of hull form has been carried out by employing five parametric geometry models with a streamlined constraint. Three Genetic Algorithm optimisation procedures are applied by three simple drag predictions which are based on the potential flow method. The results highlight the effectiveness of considering the proposed hull shape optimisation procedure for the early stage of AUV hull desig
New Keynesian Economics and the Phillips Curve.
No full textModels with sticky prices are an important part of New Keynesian economics. The author shows that several of the New Keynesian models imply a formulation that is similar to the expectations-augmented Phillips curve of Milton Friedman and Edmund Phelps. He then presents new estimates of the New Keynesian Phillips curve. The author uses two proxies for price expectations: survey-based measures and an econometric-based measure originally developed by Bennett McCallum (1976). Overall, the results are consistent with the model but the survey-based results are more precise, suggesting that the surveys may be better measures of actual expectations. Copyright 1995 by Ohio State University Press.
Business Cycles in the Phillips Machine
No full textOver the summer of 2003, the author undertook the refurbishment of the Cambridge Phillips Machine with help from technicians in the Cambridge University Engineering Dept and with advice from economists. The Machine now works and - moreover - is safe to work with. The Machine has since been used to give numerous working demonstrations to a wide variety of audiences from schoolchildren to distinguished economists. This paper describes some of the standard experiments that can be conducted on the Machine. Also described are more recent simulations which attempt to demonstrate the possibility of generating business cycles - of both linear and nonlinear Hicksian types - from the basic accelerator-multiplier system.
The use of computational fluid dynamics to assess the hull resistance of concept autonomous underwater vehicles
No full textAutonomous Underwater Vehicles (AUV’s) provide an important tool for collecting detailed scientific information from the oceans depths. The hull resistance of an AUV is an important factor in determining the powering requirements and range of the vehicle. This paper discusses the use of Computational Fluid Dynamics (CFD) to determine the hull resistance of three existing AUV’s, of differing shape and size. The predictions are compared with available experimental data and good agreement found. This work has demonstrated that with use of suitable shape parameterisation it is possible to carry out concept design evaluation using a RANS flow solver
The wage curve and the Phillips curve
No full textlevel of unemployment is related to the fevel of wages. This result is at variance with an application of the original Phillips curve to regional data, which would predict that the change in wages ought to be related to the unemployment rate. On the other hand, there is considerable empirical support for the expectations-augmented Phillips curve using macroeconomic data. I resolve this tension by showing that a standard macroeconomic expectations-augmented Phillips curve can be derived from microfoundations that begin with the wage curve. I am grateful to Kevin Hassett, David Lebow, and Andrew Oswald for helpful comments. The views expressed in this paper are those of the author and not necessarily those of the Board of Governors of the Federal Reserve System or other members of its staff. In their book The Wage Curve, Blanchflower and Oswald (1994) argue that wages are determined by a “wage curve ” that relates an individual’s wage to the level of the unemployment rate in their region or industry. Blanchflower an
Optimal monetary policy rules : theory and estimation for OECD countries
No full textZhang W. Optimal monetary policy rules : theory and estimation for OECD countries. Bielefeld (Germany): Bielefeld University; 2004.This dissertation focuses on monetary policy rules in the OECD countries at both theoretical and empirical levels. It is divided into seven chapters.
Chapter 1 presents some recent literature on monetary policy rules and introduces the goal and organization of this dissertation.
Chapter 2 explores some empirical evidence of IS and Phillips curves, because these two equations have become baseline framework of monetary policy. Both backward- and forward-looking behaviors are considered. A time-varying Phillips curve is also estimated.
Chapter 3 discusses two important monetary policy rules: the money supply rule and the interest rate rule. Advantages and disadvantages of these two rules are explored.
Chapter 4 explores time-varying monetary policy rules with Chow break-point test and Kalman filter. The estimation results indicate that there are some structural changes in the monetary policy in the countries studied. The author also simulates the Euro-area economy under the assumption that the Euro-area had followed the time-varying US monetary policy in the 1990s and concludes that the monetary policy seems to be too tight in the Euro-area in the 1990s.
Chapter 5 explores monetary policy rules under uncertainty. The author first explores empirical evidence of model uncertainty with a state-space model with Markov-switching. Based on this evidence, the author then explores monetary policy under uncertainty with two approaches: the adaptive learning and the robust control. The results indicate that uncertainty does not necessarily require caution and that state variables do not necessarily converge even in a deterministic model with the adaptive learning.
Chapter 6 then explores monetary policy with financial markets. The author endogenizes the probability for the asset price bubble to increase or decrease in the next period and derives a nonlinear policy rule. The author also simulates the economy with financial asset in the presence of the zero-interest-rate bound and concludes that monetary policy should not ignore financial markets.
Chapter 7 presents some concluding remarks of the dissertation
The simulation of free surface flows with Computational Fluid Dynamics
No full textComputational fluid dynamics is a powerful and versatile tool for the analysis of flow problems encountered in themaritime environment. The University of Southampton Fluid-Structure Interactions research group use ANSYS CFX tomodel a wide variety of flow problems; to gain insight into flow physics, improve designs and increase the efficiencyand safety of marine vehicles. A series of three case studies from on-going research looks at: loads applied on liquefiednatural gas tanks due to sloshing, slamming pressures experienced by high speed craft as well as the influence ofpropellers on the resistance characteristics of autonomous underwater vehicles. The presence of the free surface,complex shapes and the unsteady nature of these applications make their simulation with computational fluid dynamicsparticularly challenging. The successful validation of the computational models has resulted in the development of aselection process for suitable multiphase models as well as cost-effective meshing strategies
The history of Pembrokeshire,
No full text"The author had projected a history that would have dealt with the county to the close of the nineteenth century. His outline included three chapters ... Georgian Pembrokeshire, The landing of the French, and Modern days, which he did not live to write." The incomplete manuscript was pub. after his death under the general superintendence of T. C. Rees. cf. Foreword (by J. and M. Phillips)Mode of access: Internet
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