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Analysis on Degradation of Ferroelectric Memory
Sangwoo Kim,Jeonghan Kim,Soi Jeong,Kiryun Kwon,Changhyeon Han,Eunchan Park,Jiyong Yim,Been Kwak,Jiwon You,Daewoong Kwon 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.10
Subthreshold swing degradation of ferroelectric-gate field effect transistor (FeFET) memory are analyzed through DC and fast drain current (ID)-gate voltage (VG) measurements. From the fast ID-VGs before endurance cycling, it is revealed that acceptor-like traps with millisecond-order response time mainly exist in the gate oxide of FeFETs and the traps cause the different subthreshold swing (SS) between erase and program states.
Sensing of Vascular Permeability in Inflamed Vessel of Live Animal
Park, Sang A,Jeong, Soi,Choe, Young Ho,Hyun, Young-Min Hindawi 2018 Journal of analytical methods in chemistry Vol.2018 No.-
<P>Increase in vascular permeability is a conclusive response in the progress of inflammation. Under controlled conditions, leukocytes are known to migrate across the vascular barriers to the sites of inflammation without severe vascular rupture. However, when inflammatory state becomes excessive, the leakage of blood components may occur and can be lethal. Basically, vascular permeability can be analyzed based on the intensity of blood outflow. To evaluate the amount and rate of leakage in live mice, we performed cremaster muscle exteriorization to visualize blood flow and neutrophil migration. Using two-photon intravital microscopy of the exteriorized cremaster muscle venules, we found that vascular barrier function is transiently and locally disrupted in the early stage of inflammatory condition induced by N-formylmethionyl-leucyl-phenylalanine (fMLP). Measurement of the concentration of intravenously (i.v.) injected Texas Red dextran inside and outside the vessels resulted in clear visualization of real-time increases in transient and local vascular permeability increase in real-time manner. We successfully demonstrated repeated leakage from a target site on a blood vessel in association with increasing severity of inflammation. Therefore, compared to other methods, two-photon intravital microscopy more accurately visualizes and quantifies vascular permeability even in a small part of blood vessels in live animals in real time.</P>
Two-photon intravital imaging of leukocyte migration during inflammation in the respiratory system
Young-Min Hyun,Young Min Kim,Soi Jeong,Young Ho Choe 대한중환자의학회 2019 Acute and Critical Care Vol.34 No.2
Two-photon intravital imaging is a powerful method by which researchers are able to directly observe biological phenomena in live organisms. Researchers in various biomedical research fields have applied two-photon imaging to a variety of target organs by utilizing this technology’s ability to penetrate to significant depths with minimal phototoxicity. The mouse respiratory system in inflammation models is a good example, as two-photon intravital imaging can provide insights as to how the immune system is activated in response to inflammation within the respiratory system. Inflammation models can be generated via influenza viral, bacterial, or lipopolysaccharide injection. To exteriorize the lungs or trachea, thoracotomy or tracheotomy is performed, respectively; the appropriate combination of inflammation induction and organ exposure is selected depending on the study purpose. On the other hand, visualizing the movement of leukocytes is also an important component; to this end, immune cell populations of interest are either labeled via the genetic attachment of fluorescent proteins or stained with antibodies or dyes. With the proper selection of methods at each step, twophoton intravital imaging can yield visual evidence regarding immune responses to inflammation.