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2유체 분사노즐을 이용한 분무 및 연소특성에 관한 실험적 연구
백민수,오상헌 대한기계학회 1995 대한기계학회논문집 Vol.19 No.2
An experimental investigation has been conducted to study the spray and combustion characteristics using the air-assisted twin fluid atomizer. Axial mean and fluctuating velocity components as well as drop-size distributions in non-reaction spray were measured with a nonintrusive phase doppler technique. Droplet number density distributions were also visualized using high speed CCD camera. Locations of spray and flame boundaries are obtained by direct photographic method. It is confirmed that at the fixed fuel flow rate, the increase of the atomizing air flow causes improvements on both spray and combustion characteristics under stable flame conditions. Internal group combustion modes where flame is located inside the spray boundary are observed to exist in the upstream region of higher droplet number density.
플라이애시를 다량 사용한 콘크리트의 강도특성에 관한 연구
백민수,이영도,정상진,Paik, Min-Su,Lee, Young-Do,Jung, Sang-Jin 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.4
To study of binder and fine aggregate a lot of replacement fly-ash concrete, initial characteristics, standard environment of curing temperature $20^{\circ}C$, hot-weather environment, cold weather environment of curing temperature $5^{\circ}C$. Flash concrete tested slump, air contest, setting and Hardening concrete valuated setting period of form, day of age 3, 7, 28 compression strength in sealing curing. Underwater curing specimen compression strength of age 3. 7, 28day used strength change accordingly fly-ash concrete curing temperature. Purpose of study is consultation materials in field that variety of fly-ash replacement concrete mix proportion comparison and valuation. (1) Setting test result, fly-ash ratio of replacement higher delay totting time. Same volume of fly-ash ratio of replacement is lower fly-ash ratio of replacement fine aggregate delay setting time. Setting test in curing temperature $35^{\circ}C$ over twice fast setting in curing temperature $20^{\circ}C$ and all specimen setting delay in curing temperature $5^{\circ}C$. F40 specimen end of setting about 30 time. (2) Experiment result age 28day compression strength more fisher plan concrete then standard environment in curing temperature $20^{\circ}C$, cold weather environment in curing temperature $5^{\circ}C$, most strength F43 is hot-weather environment in curing temperature $35^{\circ}C$ replacement binder 25%, fine aggregate 15%. (3) Hot-weather environment replacement a mount of fly-ash is a same of plan concrete setting period of form. Age 28day compression strength replacement a mount of fly-ash more hot-weather concrete then plan concrete.
인공수정체공막고정술 이후 발생한 인공수정체 동공끼임환자에서 레이저홍채절개술의 치료 2예
백민수,박율리,조경진 대한안과학회 2019 대한안과학회지 Vol.60 No.4
Purpose: We report two cases of intraocular lens (IOL) pupillary optic capture following IOL scleral fixation treated with argon laser iridotomy. Case summary: (Case 1) A 69-year-old man presented with suddenly decreased visual acuity of the left eye. The best-corrected visual acuity was finger count (FC) 30 cm in the left eye. Slit lamp examination revealed subluxation of the left eye IOL. An IOL scleral fixation and anterior vitrectomy were performed and no specific findings were observed. During the follow-up period, pupillary optic capture was repeated without specific causes, such as trauma, or IOL decentration thus, argon laser iridotomy was performed. (Case 2) A 77-year-old man presented with a 3-day history of congestion of the left eye and decreased visual acuity. Best-corrected visual acuity was 0.4 logarithm of the minimum angle of resolution (logMAR) in the left eye. Slit lamp examination revealed subluxation of the left eye IOL. An IOL scleral fixation and anterior vitrectomy were performed, and no specific findings were observed. During the follow-up period, pupillary optic capture was found, and IOL repositioning and argon laser iridotomy were performed. Conclusions: Laser iridotomy can be used to prevent recurrence of pupillary optic capture in eyes with IOL scleral fixation without decentration or distortion. 목적: 인공수정체공막고정술 이후 발생한 인공수정체 동공끼임환자에서 아르곤레이저홍채절개술을 통해 치료한 증례 2예를 보고하고자 한다. 증례요약: (증례 1) 69세 남자 환자가 갑작스러운 좌안 시력저하로 내원하였다. 최대교정시력 좌안 안전수지 30 cm였고, 세극등현미경검사상 좌안 인공수정체 불완전 이탈이 확인되었다. 인공수정체공막고정술 및 앞유리체절제술을 시행하였으며 이후 경과 관찰 도중 외상 등 특별한 원인 없이 인공수정체 동공끼임이 2회 반복되었고, 인공수정체 재위치 및 레이저홍채절개술을 시행하였다. (증례 2) 77세 남자 환자가 3-4일 전부터 발생한 좌안 충혈을 주소로 내원하였다. 최대교정시력은 좌안 0.4 logMAR였고, 세극등현미경검사상 좌안 인공수정체 불완전 이탈이 확인되었다. 좌안 인공수정체공막고정술 및 앞유리체절제술을 시행하였으며, 이후 경과 관찰 도중 발생한 인공수정체 동공끼임이 발견되어 인공수정체 재위치 및 레이저홍채절개술을 시행하였다. 결론: 인공수정체공막고정술 이후 중심이탈 또는 뒤틀림 등의 소견이 없던 눈에서 동공끼임이 발생하였을 경우에 레이저홍채절개술시행이 재발을 억제할 수 있는 치료 방법으로 고려될 수 있겠다.
백민수,경성은 대한안과학회 2019 대한안과학회지 Vol.60 No.6
Purpose: We report two patients diagnosed with a sinus thrombosis with papillary edema. Case summary: Case 1 was a 27-year-old male who presented with complaints of headache and vomiting for 2 months and blurred vision in both eyes. The best-corrected visual acuity (BCVA) was 1.0 in the right eye and 1.0 in the left eye. A visual field (VF) examination revealed a binocular peripheral VF defect and optical coherence tomography (OCT) and a fundus examination indicated optic disc swelling in both eyes. Brain magnetic resonance imaging (MRI) showed no specific finding but magnetic resonance venography revealed filling defect signs in the transverse sinus and a cerebrospinal fluid examination indicated elevated intracranial pressure (ICP). Case 2 was a 54-year-old female who came to our hospital with suspicion of bilateral optic disc swelling. The BCVA was 0.9 in the right eye and 1.0 in the left eye. A VF examination revealed an inferior-temporal VF defect and blind spot enlargement in the right eye. OCT and a fundus examination showed optic disc swelling in both eyes. Brain MRI showed no specific finding but magnetic resonance venography revealed a decrease in blood flow in the transverse sinus, sigmoid sinus. A cerebrospinal fluid examination indicated elevated ICP. Conclusions: In the case of optic disc swelling in both eyes, a secondary cause of ICP elevation and the possibility of optic disc swelling due to sinus thrombosis should be considered, and brain MRI and venography are needed to distinguish these possibilities. 목적: 양안 시신경유두부종이 관찰된 2명의 환자에서 정맥동 혈전증을 진단하여 이를 보고하고자 한다. 증례요약: 증례 1) 27세 남자 환자가 2달 전부터 발생한 두통 및 구토, 양안 시야 흐림을 주소로 내원하였다. 최대교정시력은 우안1.0, 좌안 1.0이었으며, 시야검사에서 양안 주변부 시야결손, 빛간섭단층촬영 및 안저검사에서 양안 시신경유두부종이 관찰되었다. 뇌 자기공명영상에서는 정상 소견을 보였으나 뇌 자기공명정맥조영검사에서 횡정맥동 충만결손 소견이 있었고, 뇌척수액검사에서 뇌압상승 소견을 보였다. 증례 2) 54세 여자 환자가 양안 시신경유두부종으로 의뢰되었다. 최대교정시력은 우안 0.9, 좌안 1.0이었으며, 시야검사에서 우안 하이측 시야결손과 맹점확대 소견, 빛간섭단층촬영 및 안저검사에서 양안 시신경유두부종이 관찰되었다. 뇌 자기공명영상에서는 정상 소견을 보였으나 뇌 자기공명정맥조영검사에서 횡정맥동, 구불정맥동에서의 혈류 감소 소견이 있었으며, 뇌척수액검사에서 뇌압상승 소견을 보였다. 결론: 양안의 시신경유두부종이 있는 경우 정맥동 혈전증에 의한 유두부종의 가능성을 고려하여 뇌 자기공명영상과 함께 뇌 자기공명정맥조영검사를 고려하여야 할 것으로 생각된다.