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Jiwon Choi(Jiwon Choi),Keesin Jeong(Keesin Jeong),Haiyoung Jung(Haiyoung Jung) 한국화재소방학회 2022 International Journal of Fire Science and Engineer Vol.36 No.4
Dust and fine dust exist in various forms and can lead to various problems such as dust explosion and air pollution. To reduce them, recently, research on electrospray electric precipitation, among various dust collection methods, has been actively conducted. In this study, comparative analysis experiments were performed on microdroplet generation characteristics for direct and indirect charging methods of electrospray electric precipitation. A visualization device was fabricated to generate microdroplets, and microdroplets were photographed with a high-magnification camera according to each charging method. The size and number of microdroplets were then analyzed via ImageJ software.
Jeong, Jiwon,Alfreider, Markus,Konetschnik, Ruth,Kiener, Daniel,Oh, Sang Ho Elsevier 2018 ACTA MATERIALIA Vol.158 No.-
<P><B>Abstract</B></P> <P>To investigate the mechanism of { 10 1 ¯ 2 } twinning in magnesium (Mg) single crystal and its influence on mechanical size effects and strain rate dependent deformation behavior, in-situ microcompression of Mg [ 2 1 ¯ 1 ¯ 0 ] pillars of various sizes from 0.5 μm to 4 μm was carried out in a scanning electron microscope (SEM) and also in a transmission electron microscope (TEM), covering strain rates from 10<SUP>−4</SUP> to 10<SUP>−2</SUP> s<SUP>−1</SUP>. The in-situ observations directly showed that the pile-up of prismatic <<I>a</I>> dislocations acts as local stress concentration for the twin nucleation. Preceding the twin nucleation, the lead dislocation from the dislocation pile-up cross-slips to the basal plane and dissociates into partial dislocations, one of which trails a stacking fault (SF) behind. The twin nucleus of a finite size formed at the junction between prismatic <<I>a</I>> dislocations and basal SFs and subsequently propagated rapidly across the pillar. The present in-situ observations reveal that not only the dislocation pile-up but also the dissociation reaction of <<I>a</I>> dislocations play critical roles in the nucleation of { 10 1 ¯ 2 } twins. Furthermore, the { 10 1 ¯ 2 } twinning exhibits a relatively strong size effect in terms of the twin nucleation stress (size exponent <I>n</I> = 0.7). This pronounced size effect may arise from the fact that the precursor to twin nucleation, namely dislocation pile-up and junction formation, depends more strongly on the crystal size than the ordinary dislocation source operation. Moreover, a noticeable effect of the strain rate is that a higher rate (10<SUP>−2</SUP> s<SUP>−1</SUP>) promotes the activation of basal slip within the { 10 1 ¯ 2 } twin. While the twin nucleation occurs more easily at a high strain rate, here the twin growth rate cannot cope with the applied strain rate, so that strain energy accumulation increases with applied strain. When the twin grows to reach the required twin thickness for basal slip, the basal slip promptly activates within the twinned region to release the accumulated strain energy and plastic deformation swiftly catches up with the applied strain rate.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jiwon Jeong,Chul Hoon Chung,Yongjoon Chang,Kuylhee Kim,Soyeon Jung 대한수부외과학회 2024 대한수부외과학회지 Vol.29 No.1
The incidence of high-pressure injection injuries is increasing with the development of industry and use of injectors. Although high-pressure injection injuries are relatively rare, they commonly lead to complications such as skin necrosis, infection, and amputation. Moreover, the initial presentation is prone to be underestimated because of the small entry point at the patient’s first encounter in emergency care. A prompt surgical intervention is required, with appropriate and rapid initial treatments, including broad-spectrum antibiotics and tetanus toxoid. The surgical treatment involves wide debridement for foreign material removal and subsequent reconstruction. In this case report, we present three cases we encountered and the ensuing complications. All three patients who received the same treatments are discussed in detail.
Jeong, Sanghwa,Won, Nayoun,Lee, Jinsik,Bang, Jiwon,Yoo, Jeongsoo,Kim, Sang Geol,Chang, Jeong Ah,Kim, Joonghyun,Kim, Sungjee Royal Society of Chemistry 2011 Chemical communications Vol.47 No.28
<P>A new multiplexed NIR <I>in vivo</I> imaging is showcased by using quantum dots and NaYF<SUB>4</SUB>:Yb<SUP>3+</SUP>,Tm<SUP>3+</SUP> nanoparticles. The ‘temporal’ multiplexing is demonstrated by alternating the excitation wavelengths and unmixing the emissions of different probes. Multiplexed cellular imaging and the cellular trafficking in animal models are shown.</P> <P>Graphic Abstract</P><P>A new multiplexed imaging scheme is demonstrated by alternating the excitation wavelength of quantum dots and NaYF<SUB>4</SUB>:Yb<SUP>3+</SUP>,Tm<SUP>3+</SUP> nanoparticles. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc12746b'> </P>