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Simone Rudnin,Josh Greenstein,Abbas Husain 대한응급의학회 2021 Clinical and Experimental Emergency Medicine Vol.8 No.1
Free open access medical education (FOAM) harnesses the power of various digital communication platforms such as websites, blogs, tweets, podcasts, videos, and social media applications. This online community contributes to sharing ideas and “accelerates the translation of research into clinical practice.”1 In this paper, we will explore the use of FOAM to learn and teach pointof-care ultrasound (POCUS) as images and videos of ultrasonography are easily posted and shared online with clinical vignettes and procedure descriptions.
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An Empirical Indoor Path Loss Model for Ultra-Wideband Channels
Ghassemzadeh, Saeed-S.,Greenstein, Larry-J.,Kavcic, Aleksandar,Sveinsson, Thorvardur,Tarokh, Vahid The Korea Institute of Information and Commucation 2003 Journal of communications and networks Vol.5 No.4
We present a statistical model for the path loss of ultrawideband (UWB) channels in indoor environments. In contrast to our previously reported measurements, the data reported here are for a bandwidth of 6GHz rather than 1.25GHz; they encompass commercial buildings in addition to single-family homes (20 of each); and local spatial averaging is included. As before, the center frequency is 5.0GHz. Separate models are given for commercial and residential environments and, within each category, for lineof sight (LOS) and non-line-of-sight (NLS) paths. All four models have the same mathematical structure, differing only in their numerical parameters. The two new models (LOS and NLS) for residences closely match those derived from the previous measurements, thus affirming the stability of our path loss modeling. We find, also, that the path loss statistics for the two categories of buildings are quite similar.
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Nalbandian, Michael J.,Greenstein, Katherine E.,Shuai, Danmeng,Zhang, Miluo,Choa, Yong-Ho,Parkin, Gene F.,Myung, Nosang V.,Cwiertny, David M. American Chemical Society 2015 Environmental science & technology Vol.49 No.3
<P>Titanium dioxide (TiO<SUB>2</SUB>) nanofibers with tailored structure and composition were synthesized by electrospinning to optimize photocatalytic treatment efficiency. Nanofibers of controlled diameter (30–210 nm), crystal structure (anatase, rutile, mixed phases), and grain size (20–50 nm) were developed along with composite nanofibers with either surface-deposited or bulk-integrated Au nanoparticle cocatalysts. Their reactivity was then examined in batch suspensions toward model (phenol) and emerging (pharmaceuticals, personal care products) pollutants across various water qualities. Optimized TiO<SUB>2</SUB> nanofibers meet or exceed the performance of traditional nanoparticulate photocatalysts (e.g., Aeroxide P25) with the greatest reactivity enhancements arising from (i) decreasing diameter (i.e., increasing surface area), (ii) mixed phase composition [74/26 (±0.5) % anatase/rutile], and (iii) small amounts (1.5 wt %) of surface-deposited, more so than bulk-integrated, Au nanoparticles. Surface Au deposition consistently enhanced photoactivity by 5- to 10-fold across our micropollutant suite independent of their solution concentration, behavior that we attribute to higher photocatalytic efficiency from improved charge separation. However, the practical value of Au/TiO<SUB>2</SUB> nanofibers was limited by their greater degree of inhibition by solution-phase radical scavengers and higher rate of reactivity loss from surface fouling in nonidealized matrixes (e.g., partially treated surface water). Ultimately, unmodified TiO<SUB>2</SUB> nanofibers appear most promising for use as reactive filtration materials because their performance was less influenced by water quality, although future efforts must increase the strength of TiO<SUB>2</SUB> nanofiber mats to realize such applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2015/esthag.2015.49.issue-3/es502963t/production/images/medium/es-2014-02963t_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es502963t'>ACS Electronic Supporting Info</A></P>
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Julio T. Chong,Kathleen M. Kan,Courtney K. Phillips,Alexander Greenstein 대한비뇨의학회 2018 Investigative and Clinical Urology Vol.59 No.3
Purpose: Placement of pre-operative ureteral catheters for colorectal surgery can aid in the identification of ureteral injuries. This study investigates whether simultaneous ureteral catheterization with surgery skin preparation can minimize operating room times without increasing post-operative complications. Materials and Methods: Patients undergoing simultaneous colorectal surgery skin preparation and placement of pre-operative ureteral catheters (n=21) were compared to those who underwent these events sequentially (n=28). Operative time-points of anesthesia ready (AR), surgery procedure start (PS), dorsal lithotomy and catheter insertion (CI) times were compared to assess for differences between groups. Complications were compared between groups. Results: There were no differences in age, gender, body mass index (BMI), American Society of Anesthesiologists (ASA), comorbidities, current procedure terminology (CPT) or International Classification of Diseases, 9th revision (ICD-9) codes between groups. Simultaneous catheterization saved 11.82 minutes of operative time between CI to PS (p=0.005, t-test). There was a significant difference in mean time between CI to PS (11.82 minutes, p=0.008) between simultaneous and sequential ureteral catheterization groups in a linear regression multivariate analysis controlling for age, BMI, CPT and ICD-9 codes. There were 4 complications in the simultaneous (19%) and 3 in the sequential group (11%) (p=0.68). Conclusions: Ureteral catheterization and colorectal surgery skin preparation in a simultaneous fashion decreases the time between CI and PS without significant increase in complications. Mean time saved with simultaneous ureteral catheterization was 11.82 minutes per case. Simultaneous ureteral catheterization may be an option in colorectal surgery and may result in cost savings without additional complications.
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