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A Comparative Study of Request Strategies between Native and Non-Native Speakers of English
Donghee Son(Donghee Son) 한국사회언어학회 2023 사회언어학 Vol.31 No.1
This paper aims to investigate Korean EFL learners’ pragmatic performance in request speech acts in comparison with native speakers of English. Written discourse completion tasks (WDCT) are used to examine how native and non-native speakers request in terms of request strategies, internal modifications, and external modifications. The results show that first, Korean learners had a higher frequency of inappropriate strategies than native speakers. Second, they lacked the quantity and variety of internal modifications both lexically and syntactically. However, regarding external modifications, their use of supportive moves was similar to that of natives in frequency and order. In addition, this study identified newly emergent supportive moves that are Korean-specific and detrimental to communication goals. The findings shed light on pragmatic instruction in the Korean EFL situation by providing research-informed data. Several pedagogical implications are suggested for application in teaching.
Son, Donghee,Koo, Ja Hoon,Song, Jun-Kyul,Kim, Jaemin,Lee, Mincheol,Shim, Hyung Joon,Park, Minjoon,Lee, Minbaek,Kim, Ji Hoon,Kim, Dae-Hyeong American Chemical Society 2015 ACS NANO Vol.9 No.5
<P>Electronics for wearable applications require soft, flexible, and stretchable materials and designs to overcome the mechanical mismatch between the human body and devices. A key requirement for such wearable electronics is reliable operation with high performance and robustness during various deformations induced by motions. Here, we present materials and device design strategies for the core elements of wearable electronics, such as transistors, charge-trap floating-gate memory units, and various logic gates, with stretchable form factors. The use of semiconducting carbon nanotube networks designed for integration with charge traps and ultrathin dielectric layers meets the performance requirements as well as reliability, proven by detailed material and electrical characterizations using statistics. Serpentine interconnections and neutral mechanical plane layouts further enhance the deformability required for skin-based systems. Repetitive stretching tests and studies in mechanics corroborate the validity of the current approaches.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-5/acsnano.5b01848/production/images/medium/nn-2015-01848z_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b01848'>ACS Electronic Supporting Info</A></P>
Nanomaterials in Skin-Inspired Electronics: Toward Soft and Robust Skin-like Electronic Nanosystems
Son, Donghee,Bao, Zhenan American Chemical Society 2018 ACS NANO Vol.12 No.12
<P>Skin-inspired wearable electronic/biomedical systems based on functional nanomaterials with exceptional electrical and mechanical properties have revolutionized wearable applications, such as portable Internet of Things, personalized healthcare monitors, human-machine interfaces, and even always-connected precise medicine systems. Despite these advancements, including the ability to predict and to control nanolevel phenomena of functional nanomaterials precisely and strategies for integrating nanomaterials onto desired substrates without performance losses, skin-inspired electronic nanosystems are not yet feasible beyond proof-of-concept devices. In this Perspective, we provide an outlook on skin-like electronics through the review of several recent reports on various materials strategies and integration methodologies of stretchable conducting and semiconducting nanomaterials, which are used as electrodes and active layers in stretchable sensors, transistors, multiplexed arrays, and integrated circuits. To overcome the challenge of realizing robust electronic nanosystems, we discuss using nanomaterials in dynamically cross-linked polymer matrices, focusing on the latest innovations in stretchable self-healing electronics, which could change the paradigm of wearable electronics.</P> [FIG OMISSION]</BR>
Bioresorbable Electronic Stent Integrated with Therapeutic Nanoparticles for Endovascular Diseases
Son, Donghee,Lee, Jongha,Lee, Dong Jun,Ghaffari, Roozbeh,Yun, Sumin,Kim, Seok Joo,Lee, Ji Eun,Cho, Hye Rim,Yoon, Soonho,Yang, Shixuan,Lee, Seunghyun,Qiao, Shutao,Ling, Daishun,Shin, Sanghun,Song, Jun- American Chemical Society 2015 ACS NANO Vol.9 No.6
<P>Implantable endovascular devices such as bare metal, drug eluting, and bioresorbable stents have transformed interventional care by providing continuous structural and mechanical support to many peripheral, neural, and coronary arteries affected by blockage. Although effective in achieving immediate restoration of blood flow, the long-term re-endothelialization and inflammation induced by mechanical stents are difficult to diagnose or treat. Here we present nanomaterial designs and integration strategies for the bioresorbable electronic stent with drug-infused functionalized nanoparticles to enable flow sensing, temperature monitoring, data storage, wireless power/data transmission, inflammation suppression, localized drug delivery, and hyperthermia therapy. <I>In vivo</I> and <I>ex vivo</I> animal experiments as well as <I>in vitro</I> cell studies demonstrate the previously unrecognized potential for bioresorbable electronic implants coupled with bioinert therapeutic nanoparticles in the endovascular system.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-6/acsnano.5b00651/production/images/medium/nn-2015-00651k_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b00651'>ACS Electronic Supporting Info</A></P>
Adaptive Damage-Durable Electronic Epineurium for Long-Term Stable Soft Neuroprosthetics
Donghee Son(손동희) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Soft neuroprosthetics capable of monitoring sensory signals and delivering feedback motor information have pursued the perfect replacement for damaged nerves. Although such efforts have been made to the long-term stability of the peripheral neural interfaces, nerve compression and device fatigue issues still remain challenging due to the lack of optimal materials that simultaneously meet tissue-device modulus matching, biocompatibility, and electrical/mechanical self-recovery. Here, we report an adaptive self-recoverable electronic epineurium that can prevent its electrical degradation induced by repetitive deformation. Such performances originate from its unique mechanical properties: i) spontaneous rearrangement of Au nanoshell-coated Ag flakes dispersed in a self-healing polymer and ii) dynamic stress relaxation of the electronic epineurium enabling its mechanical adaptation to nerve modulus. Finally, we successfully demonstrate stable bidirectional neural recording and stimulation.
Nanoneedle Transistor-Based Sensors for the Selective Detection of Intracellular Calcium Ions
Son, Donghee,Park, Sung Young,Kim, Byeongju,Koh, Jun Tae,Kim, Tae Hyun,An, Sangmin,Jang, Doyoung,Kim, Gyu Tae,Jhe, Wonho,Hong, Seunghun American Chemical Society 2011 ACS NANO Vol.5 No.5
<P>We developed a nanoneedle transistor-based sensor (NTS) for the selective detection of calcium ions inside a living cell. In this work, a single-walled carbon nanotube-based field effect transistor (swCNT-FET) was first fabricated at the end of a glass nanopipette and functionalized with Fluo-4-AM probe dye. The selective binding of calcium ions onto the dye molecules altered the charge state of the dye molecules, resulting in the change of the source-drain current of the swCNT-FET as well as the fluorescence intensity from the dye. We demonstrated the electrical and fluorescence detection of the concentration change of intracellular calcium ions inside a HeLa cell using the NTS.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-5/nn200262u/production/images/medium/nn-2011-00262u_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn200262u'>ACS Electronic Supporting Info</A></P>