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An Junho,Nam Yoojin,Cho Hyoun,Chang Jeonga,Kim Duk-Kyung,Lee Kyung Soo 대한의학회 2022 Journal of Korean medical science Vol.37 No.10
In acute pulmonary embolism (PE), circulatory failure and systemic hypotension are important clinically for predicting poor prognosis. While pulmonary artery (PA) clot loads can be an indicator of the severity of current episode of PE or treatment effectiveness, they may not be used directly as an indicator of right ventricular (RV) failure or patient death. In other words, pulmonary vascular resistance or patient prognosis may not be determined only with mechanical obstruction of PAs and their branches by intravascular clot loads on computed tomography pulmonary angiography (CTPA), but determined also with vasoactive amines, reflex PA vasoconstriction, and systemic arterial hypoxemia occurring during acute PE. Large RV diameter with RV/left ventricle (LV) ratio > 1.0 and/or the presence of occlusive clot and pulmonary infarction on initial CTPA, and clinically determined high baseline PA pressure and RV dysfunction are independent predictors of oncoming chronic thromboembolic pulmonary hypertension (CTEPH). In this pictorial review, authors aimed to demonstrate clinical and serial CTPA features in patients with acute massive and submassive PE and to disclose acute CTPA and clinical features that are related to the prediction of oncoming CTEPH.
외국어로서의 한국어 교육과정 평가를 위한 평가 체계 개발 연구
이준호 ( Lee¸ Junho ),안정호 ( Ahn¸ Jungho ),임형옥 ( Lim¸ Hyung-ok ) 국제한국어교육학회 2021 한국어 교육 Vol.32 No.4
This study aims to design and present the framework of an evaluation system for the Korean language curriculum as a foreign language. To design the framework, this study first looked at the representative evaluation models that have been used for curriculum or educational program evaluation, and paid particular attention to the strengths of the CIPP model. In addition, this study examined some case studies of using the CIPP model that has been published in Korea as well as in overseas. And this study reviewed the results of studies conducted to evaluate the foreign language curriculum using the CIPP model. Through this procedure, the framework of an evaluation system was designed. Accordingly, the evaluation category was divided into ‘the plan of the curriculum, the contents and structure of the curriculum, the operation and execution of the curriculum, and the performance and improvement of the curriculum’ so that situation evaluation, input evaluation, process evaluation, and result evaluation are possible. The evaluation stage of the curriculum plan is further sub-categorized into environmental analysis, needs analysis, and curriculum development principles. The stage of the content and structure is sub-categorized into curriculum goals, curriculum content system, curriculum achievement standards, teaching/learning and evaluation. The operation and implementation stage of the curriculum is sub-categorized into teacher education, curriculum operation support plan, and curriculum execution. Finally, the outcomes and improvement stage are sub-categorized by dividing them into outcomes and improvement of the curriculum. In addition, detailed evaluation items were developed to fit the evaluation contents of each sub-category, and the details were described for each category. (Gyeongin National University of EducationㆍKorea University ㆍ Korea University)
Total Synthesis and Configurational Validation of (+)‐Violapyrone C
Lee, Jong Seok,Shin, Junho,Shin, Hee Jae,Lee, Hwa‐,Sun,Lee, Yeon‐,Ju,Lee, Hyi‐,Seung,Won, Hoshik WILEY‐VCH Verlag 2014 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.2014 No.21
<P><B>Abstract</B></P><P>Gold(I)‐catalyzed intramolecular 6‐<I>endo</I>‐<I>dig</I> cyclization of <I>tert</I>‐butyl ynoates afforded α‐pyrone cores of violapyrones. Moreover, this reaction was successfully applied to the stereospecific syntheses of (+)‐ and (–)‐violapyrone C, which allowed the absolute configuration of natural (+)‐violapyrone C to be assigned by comparison of the optical rotations. This first total synthesis, which proceeded in 22 % yield over 10 steps from (<I>S</I>)‐(–)‐2‐methylbutanol, features silver(I) oxide promoted monobenzylation of 1,4‐butanediol, Wittig olefination, Claisen condensation, Corey–Fuchs reaction, and gold(I)‐catalyzed α‐pyrone synthesis.</P>
Lee, Eun Kyung,Yin, Liang,Lee, Yongjin,Lee, Jong Woon,Lee, Sang Jin,Lee, Junho,Cha, Seung Nam,Whang, Dongmok,Hwang, Gyeong S.,Hippalgaonkar, Kedar,Majumdar, Arun,Yu, Choongho,Choi, Byoung Lyong,Kim, J American Chemical Society 2012 NANO LETTERS Vol.12 No.6
<P>The strongly correlated thermoelectric properties have been a major hurdle for high-performance thermoelectric energy conversion. One possible approach to avoid such correlation is to suppress phonon transport by scattering at the surface of confined nanowire structures. However, phonon characteristic lengths are broad in crystalline solids, which makes nanowires insufficient to fully suppress heat transport. Here, we employed Si–Ge alloy as well as nanowire structures to maximize the depletion of heat-carrying phonons. This results in a thermal conductivity as low as ∼1.2 W/m-K at 450 K, showing a large thermoelectric figure-of-merit (ZT) of ∼0.46 compared with those of SiGe bulks and even ZT over 2 at 800 K theoretically. All thermoelectric properties were “simultaneously” measured from the same nanowires to facilitate accurate ZT measurements. The surface-boundary scattering is prominent when the nanowire diameter is over ∼100 nm, whereas alloying plays a more important role in suppressing phonon transport for smaller ones.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-6/nl300587u/production/images/medium/nl-2012-00587u_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl300587u'>ACS Electronic Supporting Info</A></P>
Spatial Multiplexing of OFDM Signals With QPSK Modulation Over ESPAR
Lee, Junho,Lee, Ju Yong,Lee, Yong H. IEEE 2017 IEEE Transactions on Vehicular Technology VT Vol.66 No.6
<P>An electronically steerable parasitic array radiator (ESPAR) transmitter, employing one active and one parasitic antenna element, which can simultaneously transmit two orthogonal frequency division multiplexing (OFDM) signals with quadrature phase shift keying (QPSK) modulation via spatial multiplexing, is developed. In particular, a minimum mean square error (MMSE) scheme for quantizing the parasitic load impedance is developed to reduce the number of distinct load impedance values that should be realized for spatial multiplexing over ESPAR. To this end, the probability density function of the parasitic load impedance is derived, and the realizable region of the load impedance is analyzed. It is observed that the resistance of the active antenna element should be large enough to transmit OFDM signals. The characteristics of two existing ESPAR antennas with different mutual coupling matrices are examined, and it is observed that the one with the larger active antenna resistance is suitable for OFDM transmission. The bit error rate (BER) and the receive error vector magnitude performances of the proposed ESPAR systems with 6/8-bit quantizers and zero-forcing (ZF) receiver are compared with those of the corresponding ideal multiple-input multiple-output (MIMO) system through computer simulation. The results demonstrate that the performances of the proposed ESPAR with the 8-bit quantizer and the ideal MIMO systems can be almost identical, whereas the proposed ESPAR with the 6-bit quantizer exhibits some performance loss.</P>
Giant Spin-orbit Torques Induced by Orbital Hall Effect
Soogil Lee,Junho Kang,Taekhyeon Lee,Jung-Mok Kim,Dohyoung Kim,Heechan Jang,Eun Kang Park,Dongwook Go,Nyun Jong Lee,Yoshinori Kotani,Yoichi Shiota,Teruo Ono,S. Sonny Rhim,Kyung-Jin Lee,Hyun-Woo Lee,Kab 한국자기학회 2019 한국자기학회 학술연구발표회 논문개요집 Vol.29 No.2