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이산화탄소 레이저($CO_2$ laser)를 이용한 치은에 발생한 자극성 섬유종의 치료
최영찬,박주현,안형준,Choi, Young-Chan,Park, Ju-Hyun,Ahn, Hyung-Joon 대한안면통증구강내과학회 2010 Journal of Oral Medicine and Pain Vol.35 No.2
Carbondioxide($CO_2$) laser is one of the most widely employed lasers in oral soft tissue surgery because of its excellent affinity for water based soft tissues. It has some inherent advantages such as hemostasis, less postoperative swelling, reduction of bacterial population at surgical site, less need for suturing, less scarring, and less postoperative pain compared to conventional surgical therapies including the use of scalpel, diathermy, cryotherapy and electrosurgery. A 30-years-old male was presented with gingival swelling. Clinical examination revealed a well?defined pedunculated fibrotic mass on the buccal gingiva near right maxillary 1st molar. In radiographic examination, no remarkable abnormality was seen. Excisional biopsy was performed with $CO_2$ laser (continuous wave mode, 4.0W). Histological diagnosis was "Irritation fibroma". $CO_2$ laser has advantages those are suitable for surgical treatment of intraoral lesion. If appropriate training and experience are provided, the dentist would be able to manage intraoral lesions more efficiently and successfully with the use of the $CO_2$ laser.
최영찬,권정승,김성택,안형준,Choi, Young-Chan,Kwon, Jeong-Seung,Kim, Seong-Taek,Ahn, Hyung-Joon 대한안면통증구강내과학회 2009 Journal of Oral Medicine and Pain Vol.34 No.4
The purpose of this study was to present basic data that is needed in comprehension of dysesthesia after mandibular nerve injury and grasp meaning. We analyzed medical records of 59 patients who were diagnosed as dysesthesia after mandibular nerve injury from January 2007 to July 2009. The results are summarized as follows. 1. The most frequent cause was implant surgery (59%) and the most frequent injured branch of mandibular nerve was inferior alveolar nerve(81%). 2. The period passed after nerve injury showed significant interrelationship with level of pain. Visual Analogue Scale(VAS) increased from 4.82 to 6.91 after 6 month. 3. The period passed after nerve injury did not show significant interrelationship with recovery of dysesthesia. But, when conservative treatment was offered at earlier stage, ratio of patients who showed recovery of symptom tended to increase. 4. In computed tomography, level of invasion into inferior alveolar nerve canal did not show significant interrelationship with level of pain and recovery of dysesthesia. Conclusively, in the patients with dysesthesia of mandibular nerve, inferior alveolar nerve injury by dental implant surgery dominated most significant problem. Although level of invasion into inferior alveolar nerve is the most important factor to initiation of dysesthesia, there are other various factors exert more influence on the level of pain or recovery of dysesthesia. Therefore, begining conservative therapy at earlier stage is encouraged. Also, because nerve injuries can occur without direct invasion into nerve canal, so leaving enough safe space from nerve canal is needed for prevention of indirect nerve injury.
제주도 바다목장화개발 해역인 차귀도 연안해역의 이화학적특성
최영찬(Young Chan Choi),김진석(Jin Seok Kim) 한국해양환경·에너지학회 2006 한국해양환경·에너지학회 학술대회논문집 Vol.2006 No.-
At ten stations in Chagwi-Do coastal waters, in Jeju Island, there are six pysico-chemical water examinations through testing surface and bottom water in September and November in 2004 and March, May, August and November in 2005. First of all, the water temperature range of fluctuation is 16℃ from 12.2℃ to 28.9℃. Especially, bottom water is l30e in August. Next, salinity ranged from 30.2 to 34.9‰, In August. it shows the lowest salinity because of the land water. Third, NIP ratio, the growth factor of phytoplankton, shows various degrees from 5 to 76 in different stations and seasons. However, the average degree is over 22. That means phosphate phosphorus controlling factor of phytoplankton. Lastly, for organic carbon density, while TOC ranged from 92.5 to 438.3μM with an average 217μM, DOC ranged from 82.5 to 299.2μM with an average 130μM. The ratio of DOC/POC is 60% and dissolved organic carbon is examined mainly.
최영찬(Young-Chan Choi),우명호(Myung-Ho Woo) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Recently, the insulation breakdown accident has been experienced at 66kV inverter driving motor That brought about the reliability degradation of motor driving system We need to find the solution with system engineering level.<br/> The objectives of this study are developing the appropriate filter for the drive to protect the motor and the insulation system of motor which is driven by inverter We clarify the cause of the deterioration of the inverter driving motor through the analysis of insulation breakdown accidents