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Lee, Jong-Gun,Lee, Jong-Hyuk,An, Seongpil,Yoon, Joshua Yeosong,Choi, Jae-Wook,Kang, Min Gu,Lee, Jeong In,Song, Hee-eun,Al-Deyab, Salem S.,James, Scott C.,Kang, Yoonmook,Kim, Donghwan,Yoon, Sam S.,Lee, Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.695 No.-
<P><B>Abstract</B></P> <P>Supersonic cold sprayed Cu and Ni particles were deposited on Si wafers for potential use as solar-cell front electrodes. Line-printed Ni–Cu electrodes were successfully fabricated with thicknesses between 30 and 50 μm. Choice of carrier gas (nitrogen and air) and effects of particle size and impact velocity on the electrical and mechanical properties of these Ni–Cu electrodes were quantified. The carrier gas had no discernable effect on electrode properties while increased particle sizes slightly decreased electrode specific resistivities. Impact velocity had the most pronounced influence on electrode electrical properties. Both the contact and specific resistivities decreased nearly linearly with increasing impact velocity. Adhesion strength was measured with a STAB-TEST instrument and found sufficient for all measured electrodes. The electrodes were further characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and auger electron spectroscopy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Supersonically sprayed Cu and Ni particles were deposited on Si wafers for potential use as solar-cell front electrodes. </LI> <LI> Line-printed Ni–Cu electrodes were successfully fabricated with thicknesses between 30 and 50 μm. </LI> <LI> Effects of impact conditions on the electrical and mechanical properties of these Ni–Cu electrodes were quantified. </LI> <LI> Both the contact and specific resistivities decreased nearly linearly with increasing impact velocity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Best Core Stabilization for Anticipatory Postural Adjustment and Falls in Hemiparetic Stroke
Lee, Nam G.,You, Joshua (Sung) H.,Yi, Chung H.,Jeon, Hye S.,Choi, Bong S.,Lee, Dong R.,Park, Jae M.,Lee, Tae H.,Ryu, In T.,Yoon, Hyun S. Elsevier 2018 Archives of Physical Medicine and Rehabilitation Vol.99 No.11
<P><B>Abstract</B></P> <P><B>Objectives</B></P> <P>To compare the effects of conventional core stabilization and dynamic neuromuscular stabilization (DNS) on anticipatory postural adjustment (APA) time, balance performance, and fear of falls in chronic hemiparetic stroke.</P> <P><B>Design</B></P> <P>Two-group randomized controlled trial with pretest-posttest design.</P> <P><B>Setting</B></P> <P>Hospital rehabilitation center.</P> <P><B>Participants</B></P> <P>Adults with chronic hemiparetic stroke (N=28).</P> <P><B>Interventions</B></P> <P>Participants were randomly divided into either conventional core stabilization (n=14) or DNS (n=14) groups. Both groups received a total of 20 sessions of conventional core stabilization or DNS training for 30 minutes per session 5 times a week during the 4-week period.</P> <P><B>Main Outcome Measures</B></P> <P>Electromyography was used to measure the APA time for bilateral external oblique (EO), transverse abdominis (TrA)/internal oblique (IO), and erector spinae (ES) activation during rapid shoulder flexion. Trunk Impairment Scale (TIS), Berg Balance Scale (BBS), and Falls Efficacy Scale (FES) were used to measure trunk movement control, balance performance, and fear of falling.</P> <P><B>Results</B></P> <P>Baseline APA times were delayed and fear of falling was moderately high in both the conventional core stabilization and DNS groups. After the interventions, the APA times for EO, TrA/IO, and ES were shorter in the DNS group than in the conventional core stabilization group (<I>P</I><.008). The BBS and TIS scores (<I>P</I><.008) and the FES score (<I>P</I><.003) were improved compared with baseline in both groups, but FES remained stable through the 2-year follow-up period only in the DNS group (<I>P</I><.003).</P> <P><B>Conclusions</B></P> <P>This is the first clinical evidence highlighting the importance of core stabilization exercises for improving APA control, balance, and fear of falls in individuals with hemiparetic stroke.</P>
Microcylinder-laden gelatin-based bioink engineered for 3D bioprinting
Lee, Joshua,Park, Chan Hee,Kim, Cheol Sang Elsevier 2018 Materials Letters Vol.233 No.-
<P><B>Abstract</B></P> <P>Developing bioinks for 3D bioprinting that are easy to print and highly biocompatible is essential for the growth of the tissue engineering field. Here, a gelatin methacryloyl-based (GelMA) bioink that is loaded with aminolyzed poly(L-lactic acid) (PLLA) microcylinders is developed. The bioink showed better printing capabilities compared to pure GelMA, which exhibited a smaller window of high quality printability. The addition of microcylinders makes the bioink more forgiving to print by increasing its minimum viscosity while keeping its structural integrity after printing. Cell viability of printed constructs was compared to non-printed constructs to see the effects of shear stress in the new bioink.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aminolyzed PLLA microcylinders were introduced to a GelMA-based bioink for a better printing experience. </LI> <LI> The printed microcylinder-laden bioink proved to have higher resolution than pure GelMA ink. </LI> <LI> The pre-osteoblasts printed with the novel bioink exhibited increased viability compared to the conventional bioink. </LI> </UL> </P>
Joshua Lee Solomon 고려대학교 한국사연구소 2022 International Journal of Korean History Vol.27 No.1
This paper takes Imamura Eiji (1911–?) as a case study in developing a theory of minor literary style and pedagogical poetics in Japanese language Manshū literature. At the same time, it grapples with reading Japanese-language Manshū literature with postcolonial reflexivity. Imamura Eiji was an ethnic Korean who was an active participant in the Japanese language literary community of Japan-occupied Manchuria. While he is best known for his short story “Travel Companions,” this paper contends that his work and position within the Manchukuoan state can be better understood through the juxtaposition of multiple of his diverse works, including another short story entitled “New Womb.” Borrowing from Elleke Boehmer’s “postcolonial poetics,” I approach these texts from the perspective of not merely what politics they attempt, but also how they do so aesthetically and technologically. I conclude that Imamura produced a form of minor style observable in other contemporary literary production as well. While previous work on Imamura has laser focused on decoding his ethnic politics, I argue that we must aim for a more careful and critical reading by remaining aware of the contemporary politics of the academic field and relationality between scholar and text.
Lee, Jung Ho,Lee, Joshua,Unnithan, Afeesh Rajan,Kim, Cheol Sang,Park, Chan Hee American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.6
<P>Electrospinning is a simple, scalable and versatile technique, using strong electrical fields to draw polymer solutions to produce fibers with diameters ranging from micrometers to nanometers that exhibit a high surface area to volume ratio. Electrospun fibers have been the focus of research for applications such a d biomedical, water treatment filter and next-generation energy storage device etc. However, the mass production of electrospun nanofibers is not yet completely established and hence it has to struggle in terms of production cost reduction. Keeping it in mind, in this study we developed a high speed nanofiber production system composed of one meter width cylinder type nozzle block for the mass production of nanofibers. Scanning Electron microscopy (SEM) images and time measurement results showed that our cylinder type mass production system is approximately 80 times more productive than the conventional single nozzle type system. So our system will be able to produce the nanofibers in mass scale and can be effectively applied to various industries, those are in need of large amount of nanofibers.</P>
Lee, Joshua,Kim, In Gi,Oh, Young Min,Park, Chan-Hee,Kim, Cheol Sang American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.2
<P>We have investigated the effect of flow rate on shear stress and in turn thrombus formation on a lab-on-a-chip with a microchannel that is suitable for cell culture and growth. Using a combination of Arduino UNO, Arduino Motor Shield, and a SERVO stepper motor, we created a pump system that closely mimics the in vivo conditions of the human body. With this system, we achieved continuous flow of blood and observed attached platelets at the bottom of the collagen coated microslide, confirming that with shear stress, thrombus formation increases.</P>