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교감신경 의존적 및 비의존적 신경병증 통증 쥐 모델 후근신경절에서 Ca<sup>++</sup> Channel α2δ subunit와 TRPM8 발현
한동우,권태동,김연아,최종범,이윤우,Han, Dong Woo,Kweon, Tae Dong,Kim, Yeon A,Choi, Jong Bum,Lee, Youn Woo 대한통증학회 2008 The Korean Journal of Pain Vol.21 No.1
Background: Peripheral nerve injury induces up-regulation of the calcium channel alpha2delta (${\alpha}2{\delta}$) subunit and TRPM8 in the dorsal root ganglion (DRG) which might contribute to allodynia development. We investigated the expression of the ${\alpha}2{\delta}$ subunit and TRPM8 in the DRG of sympathetically maintained pain (SMP) and sympathetic independent pain (SIP) rat model. Methods: For the SMP model, the L5 and L6 spinal nerves were ligated tightly distal to the DRG. For the SIP model, the tibial and sural nerves were transected, while the common peroneal nerve was spared. After a 7 day postoperative period, tactile and cold allodynia were assessed using von Frey filaments and acetone drops, respectively. Expression of the ${\alpha}2{\delta}$ subunit and TRPM8 in the L5 and L6 DRG were subsequently examined by a Western blot. Results: There were no significant differences between the two models for the thresholds of tactile and cold allodynia. Expression of the ${\alpha}2{\delta}$ subunit in the ipsilateral DRG to the injury was increased as determined on a Western blot as compared to that in the contralateral or sham-operated DRG of the SMP model, but there was no difference in expression seen with the use of the SIP model. There was no difference in the expression of TRPM8 in the ipsilateral DRG to the injury and the contralateral or sham-operated DRG of either model. Conclusions: Up-regulation of the ${\alpha}2{\delta}$ subunit in injured DRG may play a role that contributes to tactile allodynia development in SMP, but not TRPM8 to cold allodynia after peripheral nerve injury.
직류 전계에 의한 Acceptor 첨가 BaTiO<sub>3</sub>의 유전특성 열화 현상
한동우,한영호,Hahn, Dong-Woo,Han, Young-Ho 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.2
Effects of MgO or $R_2O_3$(R:Dy, Ho, Yb) on the capacitance aging behavior of multilayer ceramic capacitors (MLCCs) based on $BaTiO_3$ dielectrics under DC electrical fields has been studied. At a DC field of 1 $V{/\mu}m$, the capacitance of MLCC specimens dropped immediately in a very short period (<10 s, the first stage) and then decreased continuously with time (the second stage). Mn doping significantly increased the aging rate in the second stage. The addition of MgO or $R_2O_3$ notably decreased the second stage aging rate of Mn-doped specimens. Yb doping gives rise to the lowest aging rate in the second stage, which is due to the larger population of defect dipoles associated with oxygen vacancies.
FCAW에서 용접금속 확산성수소량에 미치는 용접변수 영향의 정량적 해석
한동우,방국수,정홍철,이종봉,Han, Dong-Woo,Bang, Kook-Soo,Jeong, Hong-Chul,Lee, Jong-Bong 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.2
The effects of welding parameters such as contact tip-to-work distance (CTWD), voltage, and current on the weld metal diffusible hydrogen contents (HD) were investigated and rationalized by the calculation of heating time and amount of heat generated in the extension length of flux cored wire. As CTWD increased from 15 to 25mm, HD decreased from 8.46 to 5.45mL/100g deposited metal. Calculations showed that, with an increase of CTWD, the amount of heat generated increased from 46 to 92J in addition to an increase of heating time. Increase of current from 250 to 320A, however, gave little variation of HD. It showed that no significant change in the amount of heat generated was found, and heating time was decreased with an increase of current. It also showed that CTWD is more influential than voltage in relatively lower heat input ranges, while voltage is more in higher input ranges
증례보고 : 기관협착 환자의 후두미세수술 시 연장된 기관내관을 이용한 기도관리
한동우 ( Dong Woo Han ),장철호 ( Chul Ho Chang ),이종석 ( Jong Seok Lee ),나성원 ( Sung Won Na ),양혜건 ( Hye Gun Yang ),남상범 ( Sang Beom Nam ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.3
A small sized tube can be used for a patient with tracheal stenosis. However, an ordinary endotracheal tube may be not long enough to pass over stenotic lesion of trachea in adult patient for nasotracheal intubation, when stenotic lesion is located distally. We experienced a patient with severe tracheal stenotic lesion 5 cm above the carina and 3.1 cm length of stenotic lesion scheduled for laryngeal microscopic surgery. The two 4.0 mm tubes-connected tube using modified connector was designed and prepared. We performed fiberoptic-guided awake nasotracheal intubation using the extended endotracheal tube and the patient was successfully managed without complications until the surgery was completed. (Korean J Anesthesiol 2006; 51: 367~70)