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Seon‑A Jang,Seung Namkoong,이성률,Jin Woo Lee,Yuna Park,Gyeongseop So,Sung Hyeok Kim,Mi‑Ja Kim,Ki‑Hyo Jang,Alberto P. Avolio,Sumudu V. S. Gangoda,Hyun Jung Koo,Myung Kyum Kim,Se Chan Kang,Eun‑Hwa Sohn 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.1
Background Excessive intake of fat, one of the causes of obesity, is associated with low-grade infammation in various susceptible organs and eventually causes tissue toxicity. This study examines the multifaceted suppressive efects of Korean red ginseng extract (KRG) on high-fat diet (HFD)-induced lipotoxicity and infammatory responses in the aorta, liver, and brain. Methods Male C57BL/6 mice were fed HFD with or without KRG for 12 weeks. The improvement efect in KRG on lipotoxicity and infammatory potential was determined in the blood and the aorta, liver, and brain tissues. Results KRG signifcantly inhibited 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase activity by >20% in vitro. KRG supplementation suppressed HFD-associated body weight gain, lipid profle changes, and excessive fat deposition in the liver and increased leptin, insulin, and ALT levels in the blood. Infammatory markers in the aorta, liver, and brain were also signifcantly reduced by KRG treatment. In microvascular endothelial cells, the 15% cyclic stretch-mediated upregulation of ICAM-1 and vascular cell adhesion protein-1 (VCAM-1) expression was signifcantly attenuated in the presence of KRG. Conclusion KRG supplementation attenuates HFD-mediated body weight gain, lipid profle changes, and multi-tissue infammatory responses.
Clinical manifestations of headache in children younger than 7 years
Kang, Bu Seon,Lee, Jinsun,Choi, Jin Hyuk,Kwon, Hyeok Hee,Kang, Joon Won The Korean Pediatric Society 2018 Clinical and Experimental Pediatrics (CEP) Vol.61 No.11
Purpose: Headache is a common symptom during childhood. It is usually persistent and requires special care. This study aimed to identify the characteristics of headache in children <7 years of age. Methods: We reviewed 3 years of clinical files on children <7 years of age with a chief complaint of headache. Results: This study included 146 children (66 males, 80 females; mean age, $5.5{\pm}1.0years$). Mean symptom duration was $5.8{\pm}7.9months$. Attack durations were longer than 2 hours in 31 patients, shorter than 2 hours in 70 patients, and unchecked in 45 patients. Attack frequency was $15.1{\pm}10.6$ times per month. Pain locations and characteristics were also variable. Mean pain severity score was $5.1{\pm}2.2$ on the visual analog scale. Of 38 patients who underwent electroencephalography, 9 showed positive findings. Of 41 who underwent brain magnetic resonance imaging, 20 showed positive findings. The diagnoses were migraine (including probable migraine) in 34, tension-type headache in 5, and congenital malformations in 3. Medications were used in 29 patients: acetaminophen in 17, ibuprofen in 8, naproxen sodium in 1, and topiramate or amitriptyline in 3. Conclusion: In children aged <7 years, headache has a relatively benign course, but detailed history taking is needed for more accurate diagnosis.
All-carbon fiber-based chemical sensor: Improved reversible NO<sub>2</sub> reaction kinetics
Choi, Seon-Jin,Lee, Dong-Myeong,Yu, Hayoung,Jang, Ji-Soo,Kim, Min-Hyeok,Kang, Joon-Young,Jeong, Hyeon Su,Kim, Il-Doo Elsevier 2019 Sensors and actuators. B Chemical Vol.290 No.-
<P><B>Abstract</B></P> <P>All-carbon fiber-based chemiresistor is fabricated by assembling reduced graphene oxide (RGO) fiber and carbon nanotube (CNT) fiber as reversible NO<SUB>2</SUB> sensing layer and flexible heater, respectively. Both graphene oxide (GO) and CNT fibers were synthesized by wet-spinning technique facilitating lyotropic nematic liquid crystal (LC) property. Randomly entangled CNT fiber-based heater, which is embedded in one surface of colorless polyimide (cPI) film with thickness of ˜200 μm, exhibits high bending stability and heating property up to 100 °C. Single reduced graphene oxide (RGO) fiber obtained after heat treatment at 900 °C in H<SUB>2</SUB>/N<SUB>2</SUB> ambient was integrated on the CNT fiber-embedded cPI heater, thereby establishing a new type of all-carbon fiber sensing platform. As a result, accelerated NO<SUB>2</SUB> adsorption and desorption kinetics were achieved with RGO fiber at an elevated temperature. In particular, a 9.22-fold enhancement in desorption kinetic (<I>k</I> <SUB>des</SUB> = 8.85 × 10<SUP>–3</SUP> s<SUP>–1</SUP>) was observed at 100 °C compared with the desorption kinetic (<I>k</I> <SUB>des</SUB> = 0.96 × 10<SUP>–3</SUP> s<SUP>–1</SUP>) at 50 °C, which was attributed to the effective heating by CNT fiber networks. This work pioneered a research on the use of emerging carbonaceous fibers for potential application in wearable chemical detectors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel all-carbon fiber-based NO<SUB>2</SUB> sensor was fabricated for reliable environmental monitoring. Both RGO fiber and CNT fiber were synthesized by wet-spinning process, which is facile and compatible with large-scale production. </LI> <LI> Unique sensing architectures of 1D graphene fiber were achieved with nitrogen doping for NO<SUB>2</SUB> sensors. Highly conductive nitrogen-doped reduced graphene oxide (RGO) fiber was achieved with wrinkled surface morphology. </LI> <LI> CNT fibers were firstly demonstrated as heating networks for reversible NO<SUB>2</SUB> reaction. The CNT fibers with high electrical conductivity and mechanical stability are suitable for heating element to control the operating temperature of sensor. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
EPA-SWMM을 이용한 LID 기법의 비점오염 저감효과 분석
조선주 ( Seon Ju Cho ),강민지 ( Min Ji Kang ),권혁 ( Hyeok Kwon ),이재운 ( Jae Woon Lee ),김상단 ( Sang Dan Kim ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.4
Non-point source pollution management is one of the most important issues in Korean water quality/watershed management. In recent years, Low Impact Development (LID) has emerged as an effective approach to control stormwater in an urban area. This study illustrates how to design and evaluate the effect of non-point pollutant management using EPA-SWMM LID module and suggests design parameters for modeling LID facilities. In addition, optimal installation locations of LID can be determined by a simple distributed hydrologic model by using SWMM for a long-term.