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성공적인 망막박리수술 후 빛간섭단층촬영으로 진단된 중심소와 박리
강재훈,윤희성.Jae-Hoon Kang. M.D.. Hee-Seong Yoon. M.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.10
Purpose: To investigate the time course and occurrence of foveal retinal detachment presenting with symptoms of metamorphopsia and decreased visual acuity after successful surgery for macula-off retinal detachment. Methods: This study included 9 eyes of 9 patients who were diagnosed with foveal retinal detachment using optical coherence tomography (OCT) among 198 patients who had decreased visual acuity and metamorphopsia after successful rhegmatogenous retinal detachment surgery. Results: All eyes were diagnosed with foveal retinal detachment by OCT. Foveal retinal detachment occurred after scleral buckling surgery in 8 eyes (88%) and after vitrectomy and pneumoretinopexy in 1 eye. The degree and frequency of foveal retinal detachment was milder and lower after vitrectomy and pneumoretinopexy than after scleral buckling surgery. All foveal retinal detachments were reattached spontaneously after 9 months (range, 5~14 months). In all eyes, the symptom of metamorphopsia was improved and visual acuity increased after the foveal retinal detachment was reattached. Conclusions: OCT can be used to diagnose foveal retinal detachment in cases when the fundus and fluorescein angiography do not show specific findings but, presenting symptoms of decreased visual acuity and metamorphopsia. In all cases evaluated, the foveal retinal detachment was reattached spontaneously without treatment.
특발성 망막전막 제거술 전후의 다국소 망막전위도 비교에 대한 연구
강재훈,최은수,윤재문,윤희성,Jae Hoon Kang,Eun Su Choi,Jae Moon Yoon,Hee Sung Yoon 대한안과학회 2008 대한안과학회지 Vol.49 No.1
`Purpose: To assess macular function before and after vitrectomy and membrane removal in epiretinal membranes by means of multifocal electroretinogram (mfERG). Methods: The mfERGs (RETIscan?, Roland, Germany) of 28 consecutive patients (28 eyes) with idiopathic epiretinal membranes were recorded before epiretinal membrane surgery and 3 to 6 months after surgery. The average retinal response density and implicit time of each local response were estimated as anatomic macular areas corresponding roughly to 5 rings. Preoperative and postoperative responses of mfERG were compared. The correlation of the change of retinal response density and postoperative macular configuration on optical coherent tomography (OCT) was statistically analyzed. Results: The postoperative value of P1 amplitude and implicit time were not statistically correlated with the preoperative value (p>0.05). There were no significant correlations between the changes of rings 1 and 2 with regard to the retinal response density of the mfERGs and visual acuity. There was no significant correlation between the change of retinal response density and postoperative macular configuration according to OCT. Conclusions: The use of mfERGs does not seem useful for predicting clinical prognosis after epiretinal membrane surgery. Further studies of influence of internal limiting membrane removal on mfERG response should be conducted.`
강재훈(J. H. Kang),최종호(J. H. Choi) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Recently, wind turbine system capacity has been increased more and more to coped with adaptive electric supply as the national green energy policy is carried out strongly. Wind turbine blade is also increased in size to satisfy sufficiently characteristic desired. Such extra large sized wind turbine blade manufactured with GFRP material needs trimming process certainly due to production method. High efficient type automatic trimming system model with sufficient energy saving effect is established in this study to prevent serious environment problems occurred in manual work process.
강재훈(Jae-Hoon Kang) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
High rigidity must to be required to cutting tip changeable type tool with high ratio length to diameter for stable cutting process. Specially in precision drilling and milling process, deflection can be occurred at the end of tool is regarded as very serious problem, because it effects to accuracy and quality of machined parts finally as major trouble parameter.. In this study, various analytic simulations are carried out to predict deflection and stress distribution can be occurred on tool bodyr for obtaining raw data can be used to modify more proper shape model.