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No full textMKE & IITA through
IT Leading R&D Support Projec
Choi Sung Jun
No full text학위논문(석사)--아주대학교 일반대학원 :의학과,2010. 2TABLE OF CONTENTS
ABSTRACT ⅰ
TABLE OF CONTENTS iii
LIST OF FIGURES iv
LIST OF TABLES v
Ⅰ. INTRODUCTION 1
Ⅱ. PATIENTS AND METHODS 3
A. Study design 3
B. Patients 4
C. Stent and stent insertion 4
D. Statistics 4
Ⅲ. RESULTS 6
Ⅳ. DISCUSSION 13
REFERENCES 18
국문요약 24MasterBackground: The covered self expanding metal stent (SEMS) has become the main treatment option of malignant esophageal obstruction. However, the fully covered SEMS has not been as popular as the partially covered one for the fear of migration in spite of much advantage. So, we performed a prospective study to evaluate clinical efficacy of the fully covered SEMS.
Methods: Between October 1998 and February 2009, 100 consecutive patients with malignant esophageal obstruction who were treated with the fully covered Niti-S stent (Niti-S, Taewoong Medical, Seoul, Korea) were included. Data collected contained technical success rate of deployment and retrieval, dysphagia score changes, success rate of esophagorespiratory fistula (ERF) resolution, survival, stent patency and complications. We also conducted analyses concerning the associations between results and variables.
Result: Technical success rate of stent deployment was 100%. Dysphagia score was improved significantly from a mean of 3.1±0.8 to 1.3±0.7 (p=0.000) and 13 of 14 patients(14/100,14%) with ERF were resolved successfully with the initial stent(13/14, 92.9%). Median survival and stent patency was 74(51~97) and 54(47~67) days respectively. Recurrent dysphagia occurred in 19 patients (19/100,19%) with tumor ingrowth (2/100,2%), tumor overgrowth(7/100,7%), stent migration(6/100,6%), and food impaction(4/100,4%). Among other complications, early(≤7days) complications were chest pain (12/100, 12%), regurgitation (2/100 2%), tracheal compression (1/100, 1%) and late(>7days) ones were bleeding (2/100, 2%), persistent chest pain (2/100, 2%), and GERD (7/100, 7%). Reintervention had to be done in 19 patients (19/100,19%). Among them, endoscopic stent retrieval and replacement was done in 17 patients (17%) with 100% success rate and additional stents were inserted for the remaining two patients. There was no stent related mortality or 30 day mortality. In our analyses, there was no significant variable associated with clinical outcomes and complications.
Conclusions: The fully covered Niti-S metal stent has proved its effectiveness in palliation of malignant dysphagia and safety of endoscopic retrieval with a comparably low migration rate maintaining its good advantage of lower incidence of tumor ingrowth and overgrowth.
Key words; malignant dysphagia, fully covered SEMS, stent migration, stent retrieval
Variations on the Choi-Jamiolkowski isomorphism
No full textThe Choi-Jamiolkowski isomorphism is an essential component in every quantum information theorist's toolkit: it allows to identify linear maps between two quantum systems with linear operators on the composite system. Here, we analyse this widely used gadget from a new perspective. Namely, we explicitly distinguish between its kinematical and dynamical properties, that is, we study the isomorphism on two different levels: Jordan algebras and the different C∗-algebras they arise from, which are distinguished by their order of composition.
A number of important and novel insights stem from our analysis. We find that Choi's theorem, which asserts that Choi's version of the isomorphism [M.-D. Choi, Lin. Alg. Appl., 10, 285 (1975)] further maps the positive cone of completely positive linear maps (such as quantum channels) to the cone of positive linear operators (such as quantum states) on the composite system, crucially
depends on the dynamical (compositional) structure in C∗-algebras. This in turn lies at the heart of the mismatch between the basis-dependence of Choi's version of the isomorphism, and the basis-independent version by Jamiolkowski [A. Jamiolkowski, Rep. Math. Phys., 3, 275 (1972)]. Here, we overcome this subtle but pervasive issue in a number of ways: first, we prove a version
of Choi's theorem for Jamiolkowski's isomorphism, second, we define a basis-independent variant of Choi's isomorphism and, third, by making explicit the dynamical distinction between Jordan and C∗-algebras, we combine the different variants of the isomorphism into a unified description, that subsumes their individual features. We also embed and interpret our results in the graphical calculus of categorical quantum mechanics.Full Tex
Hommage à M. Choi Seung-Un
No full textIl y a un an jour pour jour, le 13 octobre 2013, M. Choi Seung-Un nous quittait. Le jour anniversaire de sa disparition est l’occasion pour le Réseau des études sur la Corée de lui rendre un modeste hommage. Nous exprimons à sa veuve notre profonde sympathie en ce jour de souvenir. J’ai eu personnellement la chance et l’honneur de côtoyer M. Choi en tant qu’étudiant, puis en tant que collègue pendant dix ans à l’université Paris Diderot. M. Choi a connu et accompagné presque tous les stades d..
EXPONENTIAL SYNCHRONIZATION OF KURAMOTO OSCILLATORS WITH TIME DELAYED COUPLING
No full textWe discuss the asymptotic frequency synchronization for the non-identical Kuramoto oscillators with time delayed interactions. We provide explicit lower bound on the coupling strength and upper bound on the time delay in terms of initial configurations ensuring exponential synchronization. This generalizes not only the frequency synchronization estimate by Choi et al. [Phys. D, 241(7):735{754, 2012] for the non-identical Kuramoto oscillators without time delays but also improves previous result by Schmidt et al. [Automatica, 48(12):3008{3017, 2012] in the case of homogeneous time delays where the initial phase diameter is assumed to be less than pi/2. The proof relies on a Lyapunov functional approach
Expositions : Lee Kang-So et Choi Byung-So
No full textChoi Byung-So, "Untitled" (Sans titre), 2005. Stylo à bille sur papier journal. 54,5 x 40,2 cm. Courtesy de l'artiste et de la Wooson Gallery. Expositions : Lee Kang-So et Choi Byung-So Musée d'art moderne et contemporain - Saint-Étienne Jusqu’au 16 octobre 2016 À l’occasion de l’année France-Corée 2015-2016, le Musée poursuit son ouverture sur la scène artistique coréenne et accueille deux expositions temporaires consacrées à Lee Kang-So et Choi Byung-So. Depuis 2005, le Musée a accueilli d..
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Molybdenum gate technology for ultrathin-body MOSFETs and FinFETs
No full textDamage-free sputter deposition and highly selective dry-etch processes have been developed for molybdenum (Mo) metal gate technology, for application to fully depleted silicon-on-insulator ( devices such as the ultrathin body (UTB) MOSFET and double-gate FinFET. A plasma charge trap effectively eliminates high-energy particle bombardment during Mo sputtering; hence the gate-dielectric integrity (TDDB, Q(BD)) is significantly improved and the field-effect mobility in Mo-gated MOSFETs follows the universal mobility curve. The effects of etch process parameters such as chlorine (Cl-2) and oxygen (O-2) gas flow rate, and source and bias radio frequence powers, were investigated in order to optimize the Mo etch rate and selectivity to SiO2. A highly selective etch process was successfully applied to pattern Mo gate electrodes for UTB MOSFETs and FinFETs without leaving any residue or stringers. Measured electrical characteristics and physical analysis results are discussed.This work was supported in part by the MARCO Focus Center on Materials, Structures,
and Devices, funded by the Massachusetts Institute of Technology, in part by MARCO under Contract 2001-MT-887, and in part by DARPA under Grant MDA972-01-1-0035. The review of this paper was arranged by Editor C.-Y. Lu. D. Ha, H. Takeuchi, and T.-J. King are with the Department of Electrical
Engineering and Computer Sciences, University of California, Berkeley, CA
94720 USA (e-mail: [email protected]).
Y.-K. Choi is with the Department of Electrical Engineering and Computer Sciences,Korea Advanced Institute of Science and Technology, Daejeon,Korea.
Digital Object Identifier 0.1109/TED.2004.83975
Figure 5 from: Bakalin V, Choi SS, Park SJ (2021) Revision of Gymnomitriaceae (Marchantiophyta) in the Korean Peninsula. PhytoKeys 176: 77-110. https://doi.org/10.3897/phytokeys.176.62552
No full textFigure 5 Marsupella tubulosa Steph. A gynoecium longitudinal section B stem cross section (fragment) C plant habit, dorsal view D leaf margin cells E, F leaves G elater, H midleaf cells. Scale bars: 1 mm (A, C, E, F); b 100 µm (B, D, G, H). All from Choi 3732 (JNU)
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