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Thompson, Zachary J.,Stickel, Andrew,Jeong, Young-Gyun,Han, Sanghoon,Son, Byung Hee,Paul, Michael J.,Lee, Byounghwak,Mousavian, Ali,Seo, Giwan,Kim, Hyun-Tak,Lee, Yun-Shik,Kim, Dai-Sik American Chemical Society 2015 NANO LETTERS Vol.15 No.9
<P>We demonstrate that high-field terahertz (THz) pulses trigger transient insulator-to-metal transition in a nanoantenna patterned vanadium dioxide thin film. THz transmission of vanadium dioxide instantaneously decreases in the presence of strong THz fields. The transient THz absorption indicates that strong THz fields induce electronic insulator-to-metal transition without causing a structural transformation. The transient phase transition is activated on the subcycle time scale during which the THz pulse drives the electron distribution of vanadium dioxide far from equilibrium and disturb the electron correlation. The strong THz fields lower the activation energy in the insulating phase. The THz-triggered insulator-to-metal transition gives rise to hysteresis loop narrowing, while lowering the transition temperature both for heating and cooling sequences. THz nanoantennas enhance the field-induced phase transition by intensifying the field strength and improve the detection sensitivity via antenna resonance. The experimental results demonstrate a potential that plasmonic nanostructures incorporating vanadium dioxide can be the basis for ultrafast, energy-efficient electronic and photonic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-9/acs.nanolett.5b01970/production/images/medium/nl-2015-01970q_0007.gif'></P>
Robinson, Thompson G.,Wang, Xia,Arima, Hisatomi,Bath, Philip M.,Billot, Laurent,Broderick, Joseph P.,Demchuk, Andrew M.,Donnan, Geoffery A.,Kim, Jong S.,Lavados, Pablo M.,Lee, Tsong-Hai,Lindley, Richa American Heart Association, Inc. 2017 Stroke Vol.48 No.7
<P>Conclusions-Low-dose alteplase may improve outcomes in thrombolysis-treated acute ischemic stroke patients on prior APT, but this requires further evaluation in a randomized controlled trial.</P>
Validation of a Novel Endoscopic Retrograde Cholangiopancreatography Cannulation Simulator
Pichamol Jirapinyo,Andrew C. Thompson,Hiroyuki Aihara,Marvin Ryou,Christopher C. Thompson 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.3
Background/Aims: Endoscopic retrograde cholangiopancreatography (ERCP) requires a unique skill set. Currently, there is noobjective methodology to assess and train a professional to perform ERCP. This study aimed to develop and validate a novel ERCPsimulator. Methods: The simulator consists of papillae presenting different anatomy and positioned in varied locations. Deep cannulation of thepancreatic duct, followed by the bile duct, was performed. The time allotted was 5 minutes. The content validity indexes (CVIs) forrealism, relevance, and representativeness were calculated. Correlation between ERCP experience and simulator score was determined. Results: Twenty-three participants completed the simulation. The CVIs for realism were orientation of duodenoscope to papilla (1.00),angulation of papillotome to achieve cannulation (0.71), and haptic feedback during cannulation (0.80). The CVIs for relevance wereuse of elevator (1.00), wheels to achieve en face orientation (1.00), and papillotome for selective cannulation (1.00). Regarding CVI forrepresentativeness, the results were as follows: basic cannulation (0.83), papilla locations (0.83), and papilla anatomies (0.80). The novice,intermediate, and experienced groups scored 6.7±8.7, 30.0±16.3, and 74.4±43.9, respectively (p<0.0001). There was a strong correlationbetween the ERCP experience level and the individual’s simulator score (Pearson value of 0.77, R2 of 0.60). Conclusions: This simulator appears to be realistic, relevant, and representative of ERCP cannulation techniques. Additionally, it iseffective at objectively assessing basic ERCP skills by differentiating scores based on clinical experience.
In-line (α,n) source sampling methodology for monte carlo radiation transport simulations
David P. Griesheimer,Andrew T. Pavlou,Jason T. Thompson,Jesse C. Holmes,Michael L. Zerkle,Edmund Caro,Hansem Joo 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.6
A new in-line method for sampling neutrons emitted in (α,n) reactions based on alpha particle source information has been developed for continuous-energy Monte Carlo simulations. The new method uses a continuous-slowing-down model coupled with (α,n) cross section data to precompute the expected neutron yield over the alpha particle lifetime. This eliminates the complexity and computational cost associated with explicit charged particle transport. When combined with an integrated alpha particle decay source sampling capability, the proposed method provides an efficient and accurate method for sampling (α,n) neutrons based solely on nuclide inventories in the problem, with no additional user input required. Results from several example calculations show that the proposed method reproduces the (α,n) neutron yields and energy spectra from reference experiments and calculations.
( Tarek Boutefnouchet ),( Christopher Downham ),( James Bassett ),( Peter Thompson ),( Andrew Sprowson ) 대한슬관절학회 2016 대한슬관절학회지 Vol.28 No.2
A systematic review of the literature was undertaken to evaluate the efficacy of medial patellofemoral ligament (MPFL) reconstruction combined with tibial tuberosity transfer (TTT) in the treatment of patellofemoral instability. Using PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines, a systematic search was carried out to identify and review the published literature pertinent to MFPL reconstruction combined with TTT. Relevant studies were critically appraised with narrative data synthesis. Studies that met the eligibility criteria were suitable for appraisal and consisted of case series and therapeutic series (levels IV & III). All studies had inherent variations in outcomes reporting and limited follow-up. Combined treatment offers restoration of normal anatomy, thus adding clinical value to the currently recommended anatomic approach to MPFL reconstruction. Nevertheless, the current body of evidence does not determine the threshold at which patellofemoral axis requires the need for adjunctive distal realignment as opposed to MPFL reconstruction alone. This review highlighted numerous recurring limitations in the conduct and presentation of the studies, which inadvertently mitigated the interpretation of their results. Future priority should be awarded to larger randomised controlled trials utilising validated patient reported outcome measures.
Anisotropic high-field terahertz response of free-standing carbon nanotubes
Lee, Byounghwak,Mousavian, Ali,Paul, Michael J.,Thompson, Zachary J.,Stickel, Andrew D.,McCuen, Dalton R.,Jang, Eui Yun,Kim, Yong Hyup,Kyoung, Jisoo,Kim, Dai-Sik,Lee, Yun-Shik American Institute of Physics 2016 Applied Physics Letters Vol.108 No.24