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백승국,하명숙,Seung Kook Baek,MD,Myung Sook Ha,MD 대한안과학회 2014 대한안과학회지 Vol.55 No.5
Purpose: This study evaluated the relationship of nasal cavity state and surgical results after endonasal dacryocystorhinostomy (DCR).<br /> Methods: We retrospectively analyzed 306 eyes of 204 patients between January 2007 and December 2011. The correlation between the existence of preoperative nasal cavity abnormality, postoperative nasal cavity complications after proper management of nasal cavity abnormality, and postoperative nasal cavity complications according to nasal packing material were investigated. We analyzed the success rates and the correlation between each set of factors.<br /> Results: The success rate of primary operations performed six months after tube removal was 87.3% (267/306). The success rate after secondary revision, granuloma removal and punctoplasty was 90.5% (277/306). Postoperative nasal cavity complications were inspected in 40 eyes. Of the 306 eyes, patients treated with Nasopore showed significantly more postoperative nasal cavity complications (47.8%, 32/67) than in patients treated with Merocel (3.3%, 8/239). The rate of postoperative nasal cavity complications was 8.7% in patients with normal nasal cavity, 16.7% in patients who received treatment, and 20% in patients without treatment, with significant statistical increase if the nasal cavity was abnormal (p = 0.019). The incidence of complications influenced the primary success rate (p = 0.008); however, preoperative nasal cavity abnormalities were not correlated with primary success (p = 0.479).<br /> Conclusions: In the case of endonasal DCR, preoperative nasal cavity abnormality and type of nasal packing material used did not affect the success rate but significantly affected postoperative nasal cavity complications. In conclusion, endonasal DCR with preoperative treatment of nasal cavity abnormality and Merocel packing is expected to reduce postoperative nasal cavity complications and increase patient satisfaction.<br /> J Korean Ophthalmol Soc 2014;55(5):633-639
망막앞막이 동반된 다발성 망막 모세혈관종에서 시행한 일차 유리체절제술 1예
백승국,진선영,이영훈,이태곤,Seung Kook Baek,MD,Sun Young Jin,MD,Young Hoon Lee,MD,Tae Gon Lee,MD 대한안과학회 2014 대한안과학회지 Vol.55 No.6
Purpose: To report the clinical result of pars plana vitrectomy (PPV) as the primary treatment in a patient with multiple bilateral retinal capillary hemangiomas (RCH) accompanying epiretinal membrane (ERM). Case summary: A 17-year-old female patient visited our clinic for decreased bilateral vision 4 days in duration. At the first visit, the vision in her right eye was 20/25 and, 20/100 in her left eye. Bilateral multiple retinal capillary hemangiomas were observed at the peripheral retina in both eyes on fundus examination, fluorescein angiography (FAG) and optical coherence tomography (OCT). ERM and associated macular edema (ME) were noted in her left eye. For her left eye, focal laser photocoagulation (PC) was performed 6 times. ME was decreased and her vision improved to 20/25. However, 3 months after the initial visit, her vision decreased to 20/400 accompanied with exacerbated ERM and ME. Therefore, PPV was performed in her left eye. ERM and associated ME were decreased and her vision improved to 20/25 after 18 months. PPV was performed in the right eye immediately after her vision worsened (best corrected visual acuity, BCVA 20/40) and ERM occurred. After 15 months later, vision in her right eye improved to 20/20 and ERM was also decreased. J Korean Ophthalmol Soc 2014;55(6):928-935
열공망막박리의 일차수술에서 25게이지 경결막 무봉합 유리체 절제술의 임상 결과
백승국,이영훈,Seung Kook Baek,Young Hoon Lee 대한안과학회 2015 대한안과학회지 Vol.56 No.1
Purpose: To evaluate 25-gauge transconjunctival sutureless vitrectomy for primary repair of rhegmatogenous retinal detachment (RRD). Methods: We performed a retrospective study of 46 consecutive eyes of 46 patients who underwent 25-gauge transconjunctival sutureless vitrectomy to repair primary RRD. Outcome measures included single surgery anatomical success rate, final anatomical success rate, postoperative visual acuity, and surgical complications.Results: Forty eyes were phakic and six eyes were pseudophakic. Twenty-six eyes had superior quadrant retinal tear, 12 eyes had inferior quadrant tear and eight eyes had both. The mean operation time was 56.3 minutes. The single surgery anatomical success rate was 93.48% (43/46). Two eyes with recurrent retinal detachment underwent fluid gas exchange: one received barrier laser treatment in the outpatient clinic, and the other underwent reoperation; the final success rate was 100%. The best corrected visual acuity improved from 1.34 log MAR to 0.48 log MAR (p < 0.01) in macula - off patients (30 eyes) and from 0.32 log MAR to 0.07 log MAR (p = 0.279) in macula - on patients (16 eyes). Postoperative complications included wound leaking (two eyes), cataract progression (13 eyes), vitreous hemorrhage (one eye), transient hypotony (one eye), and increased intraocular pressure (seven eyes). Conclusions: Primary repair of RRD using 25-gauge transconjunctival vitrectomy resulted in an excellent final anatomical success rate and postoperative visual outcomes. J Korean Ophthalmol Soc 2015;56(1):55-61
분산형 고속전철 차량 현가장치의 주요강성이 차량진동에 미치는 영향
백승국(Seung-Guk Baek),박기수(Ki-Soo Pack),신범식(Bum-Sik Shin),이래민(Rae-Min Lee),이상원(Sang-Won Lee),구자춘(Ja-Choon Koo),최연선(Yeon-Sun Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The Korean high speed train (G7) is developed as a type of the concentrated-power train. The next generation high speed train is being under development as a type of distributed-power train. The architecture of a bogie of distributed-power train differs from the one of G7. Hence, a new architecture design is required for the distributed-power train. In addition to bogie, current EMU design should be modified for the application to the distributed-power train. It is difficult to apply making EMU to make distributed-power train. Since the current EMU is a low speed model. In this study a set of design parameter study has been performed for reduction of vibration. Although dynamics of a single power car is considered, the study result may implicate overall design strategy for next generation high speed train.