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- 저자 : 정우석 (검색결과 658 건)
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정우석,김요한,이지용,이선열,김윤희,신용섭,이원형,고영권 대한마취통증의학회 2016 Anesthesia and pain medicine Vol.11 No.3
A 56-year-old man complained of continuous pain in the right foot that began 6 months after undergoing surgery on the right calcaneus bone. The patient was diagnosed with complex regional pain syndrome (CRPS) type I and was treated with medication, lumbar sympathetic ganglion blocks, epidural nerve blocks, and spinal cord stimulation. However, all treatments were halted because they were ineffective or complications developed. Peripheral nerve stimulation (PNS) was planned after confirming the analgesic effects of a sciatic nerve block, and the patient received PNS via minimally invasive ultrasound-guided electrode placement. PNS reduced the pain intensity and the incidence of paroxysmal pain. Other than discomfort at the battery insertion site (resolved with re-implantation), the patient developed no complications. These results suggest that ultrasound-guided minimally invasive PNS is a safe and effective treatment for patients with CRPS in the lower extremities.
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정우석,윤성민,양신혁,황치선 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.5
We developed methods for a process optimization of amorphous In-Ga-Zn-oxide (IGZO, atomic ratio of the IGZO target ◇ In : Ga : Zn = 1 : 1 : 1) for transparent thin-film transistors (TTFTs). During the sputtering process, the ratio of oxygen to the total gas mixture could be chosen in order to obtain better electronic properties, depending on both the RF power and the sputtering pressure. The post-anneal treatment at 300℃ for 1 hour in an O2 ambient was the most suitable condition for the interface between the IGZO channel and the Al2O3 gate insulator Finally, the introduction of a first step (FS) during the deposition was very effective in improving the electronic properties of the top-gate IGZO-TTFTs. Through these optimization methods, we achieved a field effect mobility of 11.7 cm2/sV, a sub-threshold-swing of 0.36 and a drain current on-off ratio of ~108 in the top-gate IGZO-TTFT. We developed methods for a process optimization of amorphous In-Ga-Zn-oxide (IGZO, atomic ratio of the IGZO target ◇ In : Ga : Zn = 1 : 1 : 1) for transparent thin-film transistors (TTFTs). During the sputtering process, the ratio of oxygen to the total gas mixture could be chosen in order to obtain better electronic properties, depending on both the RF power and the sputtering pressure. The post-anneal treatment at 300℃ for 1 hour in an O2 ambient was the most suitable condition for the interface between the IGZO channel and the Al2O3 gate insulator Finally, the introduction of a first step (FS) during the deposition was very effective in improving the electronic properties of the top-gate IGZO-TTFTs. Through these optimization methods, we achieved a field effect mobility of 11.7 cm2/sV, a sub-threshold-swing of 0.36 and a drain current on-off ratio of ~108 in the top-gate IGZO-TTFT.
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정우석,김요한,김재국,김범준,이정은 대한마취통증의학회 2014 Anesthesia and pain medicine Vol.9 No.3
Background: Remifentanil efficiently blunts the stress responseduring endotracheal intubation, but also causes hypotension,especially in geriatric patients. Hence, this study was designed tocompare the hemodynamic changes during the induction withpropofol or etomidate in geriatric patients. Methods: Sixty ASA physical status class I or II geriatric patients,who were scheduled for elective surgery, were randomly assignedto two groups (n = 30 each). Induction was performed with eitherpropofol (2 mg/kg mixed with lidocaine 40 mg, Group P) oretomidate (0.2 mg/kg, Group E). Both groups received a bolus doseof remifentanil (1 g/kg), followed with continuous administration(0.1 g/kg/min). An additional bolus dose (50 g) was repeated,if needed. The systolic, diastolic, mean arterial blood pressure,heart rates and cardiac index were measured before induction(baseline vital signs), after propofol or etomidate administration,before intubation, immediately after intubation and at 1, 3, 5 and10 minutes after intubation. Results: Patient characteristics and baseline vital signs weresimilar in both groups. Systolic blood pressure, diastolic bloodpressure, mean arterial blood pressure and cardiac output weresignificantly decreased in group P compared with those in groupE (P < 0.05). Heart rates decreased after the injection of bothpropofol or etomidate, but were recovered after intubation. 5patients in group P and 14 patients in group E needed an additionalbolus dose of remifentanil (P < 0.05). Conclusions: Etomidate can be used safely with remifentanil forthe stable induction of anesthesia in geriatric patients.
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Simply modified percutaneous tracheostomy using the Cook® Ciaglia Blue RhinoTM -a case series-
정우석,박상일,김병묵 대한마취통증의학회 2016 Korean Journal of Anesthesiology Vol.69 No.3
When first introduced, percutaneous dilatational tracheostomy (PDT) was performed using a bronchoscope. The bronchoscope itself, however, has several disadvantages, including interruption of ventilation. Modifications of the standard PDT technique have suggested that PDT can be safely performed without a bronchoscope. However, the safety of these modifications is unclear and many modifications have yet to be widely adopted. This study retrospectively evaluated the safety of a simplified PDT technique using the CookⓇ Ciaglia Blue RhinoTM in 186 patients. After confirming the underlying structures by palpation, PDT was performed without a bronchoscope or blunt dissection, 2.0 cm below the cricothyroid membrane. Ultrasonography was used only when palpation was difficult. Except for bleeding in three patients with coagulopathy, none of the patients experienced any early or late complications, and there were no deaths related to PDT. These findings confirm that PDT can be safely performed using a simplified technique, which may be useful in situations with limited equipment and medical personnel.
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