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( Rob Lahaye ),( Sang-eun Lee ) 한국교육공학회 2018 Educational Technology International Vol.19 No.2
Universities in Korea have driven universities’ new attempts to adopt more learner-centered and active learning in English. Problem-based Learning (PBL) is one of the well-known constructive teaching and learning methodologies in higher education. Our research goal was to design and develop the optimal PBL practices for a college physics course taught in English to promote learning and course satisfaction. For four semesters, we have tried and adjusted PBL components, and looked at the trend of the exam scores and group work achievement in each semester. We found that the number of problems and the duration of problem solving are the critical factors that influence the effect of PBL in a college physics course taught in English by going through iterative implementation. The iterative process of applying, designing, and constructing PBL to physics classes was meaningful not only in that we have found the optimal PBL model for learning a college physics course, but also in that we have been reflecting on the continuous interaction with learners during the course.
Reactive ion scattering study of physisorbed adsorbates: experiment and theory
R.J.W.E.Lahaye,강헌 한국물리학회 2003 Current Applied Physics Vol.3 No.1
We have studied reactive ion scattering (RIS) of hyperthermal (1–100 eV) Csþ projectiles from physisorbed surfaces. RIS experiments from physisorbed water on Pt(1 1 1) reveal scattering products of Cs(H2O)þn (n ¼ 1–3) cluster ions. The yields for RIS products are extremely high compared to those with chemisorbed species. Classical molecular dynamics simulations provide a new mechanism that explains the enhanced RIS yields with physisorbed species. Slow Csþ projectiles pick up physisorbed molecules via an ion–surface abstraction reaction, preferably without direct collisions between projectile and adsorbate. This RIS process is very efficient and mechanistically different from the RIS process responsible for chemisorbed species that occurs through direct collisioninduced desorption. 2002 Elsevier Science B.V. All rights reserved.
Lee, Chang-Woo,Lee, Poong-Ryul,Lahaye, Rob J. W. E.,Kang, Heon Royal Society of Chemistry 2009 Physical chemistry chemical physics Vol.11 No.13
<P>The effect of the adsorbate mass on an Eley–Rideal (ER) reaction is examined for the reactive ion scattering (RIS) of Cs<SUP>+</SUP> from physisorbed adsorbates (Ar, Kr, Xe and N<SUB>2</SUB>) on a Ru(0001) surface at hyperthermal energy (10–60 eV). The measurement of the RIS cross-section, or the efficiency for ER-type abstraction of surface adsorbates, reveals an inverse proportionality between the square root of the cross-section and the mass of the noble gases. This relationship is explained by the inertia effect which can determine the probability of successful abstraction events of the adsorbates. The result confirms a theoretical prediction that the inertia effect is important for the dynamics of an ER reaction in the hyperthermal energy regime.</P> <P>Graphic Abstract</P><P>The efficiency of an Eley–Rideal reaction with energetic projectiles is governed by the inertia effect, as demonstrated for a series of noble gas adsorbates. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b815764b'> </P>
Development of ITER-relevant plasma control solutions at DIII-D
Humphreys, D.A.,Ferron, J.R.,Bakhtiari, M.,Blair, J.A.,In, Y.,Jackson, G.L.,Jhang, H.,Johnson, R.D.,Kim, J.S.,LaHaye, R.J.,Leuer, J.A.,Penaflor, B.G.,Schuster, E.,Walker, M.L.,Wang, H.,Welander, A.S. International Atomic Energy Agency 2007 Nuclear fusion Vol.47 No.8
<P>The requirements of the DIII-D physics program have led to the development of many operational control results with direct relevance to ITER. These include new algorithms for robust and sustained stabilization of neoclassical tearing modes with electron cyclotron current drive, model-based controllers for stabilization of the resistive wall mode in the presence of ELMs, coupled linear–nonlinear algorithms to provide good dynamic axisymmetric control while avoiding coil current limits, and adaptation of the DIII-D plasma control system (PCS) to operate next-generation superconducting tokamaks. Development of integrated plasma control (IPC), a systematic approach to model-based design and controller verification, has enabled successful experimental application of high reliability control algorithms requiring a minimum of machine operations time for testing and tuning. The DIII-D PCS hardware and software and its versions adapted for other devices can be connected to IPC simulations to confirm control function prior to experimental use. This capability has been important in control system implementation for tokamaks under construction and is expected to be critical for ITER.</P>