외상으로 안구파열된 테리엔 변연변성 환자 치험 1예

권정도,김상우,박도훈,이창환,Jeong Do Kwon,Sang Woo Kim,Do Hoon Park,Chang Hwan Lee 대한안과학회 2006 대한안과학회지 Vol.47 No.7

Purpose: To report a primary surgical repair of a severe corneal laceration, a lens prolapse and a traumatic aniridia by blunt trauma in Terrien`s marginal degeneration. Methods: A 46-year-old female visited our hospital for corneal laceration due to a blunt trauma of the right eye. A primary corneal suture was done and 8 days later, amniotic membrane transplantation was performed. Results: The perforated eyeball regained its integrity with a stabilized cornea. Also, the anterior chamber was reformed and visual acuity improved. Conclusions: In the first case of Terrien`s marginal degeneration in the right eye, which had a 360-degree iridodialysis(aniridia) with aphakia due to blunt traumatic separation of the iris root from the ciliary body. We achived a good operative result with primary corneal suture and amniotic membrane transplantation.

건성안에서 눈물점마개의 치료와 탈락률에 대한 임상 고찰

권정도,박도훈,박동,이창환,Jeong Do Kwon,Do Hoon Park,Dong Park,Chang Hwan Lee 대한안과학회 2006 대한안과학회지 Vol.47 No.8

Purpose: To investigte the extrusion rate of punctal plugs and to evaluate their long-term effectiveness related to punctal occlusion. Methods: The subjects were 120 eyes of 60 patients with tear-deficient dry eye who underwent punctal occlusion using a silicone punctal plug from May 2003 to Jun 2004. They were followed up for 382.3±164.3 days. We studied the extrusion rate and the period of extrusion for each plug and examined the differences between the objective and subjective indicators of dry eye syndrome before and after plug insertion and between extruded and non-extruded punctal plugs. Results: In this study, 25.8% of all plugs were extruded during the follow-up period. The majority of plugs (41.9%) were extruded within 100 days after plug insertion. As objective indicators, results of Schirmer test and BUT were significantly increased after plug insertion. As subjective indicators, the patients` clinical symptoms significantly improved. Patient use of artificial tear drops significantly decreased and was discontinued by 70.8% after plug insertion. There were however no significant differences between the extrusion group and the non-extrusion group in each case. Conclusions: Punctal plug occlusion therapy for tear-deficient dry eye is effective, but the extrusion rate is relatively high. Regardless of punctal plug extrusion, patients experienced a symptomatic improvement. Serious consideration of this fact may greatly aid in making therapeutic adaptations and maintaining a good relationship.

특허정보를 활용한 그린IT 현황 및 기술수준분석

권정도,최강모 한국경영정보학회 2012 한국경영정보학회 학술대회논문집 Vol.2012 No.1

슈퍼 커패시터 및 태양전지를 이용한 로봇청소기용 양방향 충전시스템 설계

정도(Tao Zheng),박성욱(Sheng-Xu Piao),권대환(Dae-Hwan Kwon),구위경(Wei-Jing Qiu),김희제(Hee-Je Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.1

In this paper, a bidirectional power supply charger is proposed. This system used a solar cell panel to generate electricity and used super capacitors to store these energies, which can be used for the robot cleaner or some other electronic products. This system include a phase-shift controlled bidirectional dual active bridge (DAB) converter, solar panel super capacitors and DSP controller. In the daytime it can charge to the super capacitors to store the energy generated by the solar cell panel and in the night it will release the energy stored in the super capacitors to loads. A prototype of the proposed bidirectional power supply charger system was designed which can achieve 18V to 30V input, 10V/20W output to super capacitors and 9V/6.5W output when it acts as a charger for the robot cleaner. The system is verified to be sTable and reliable by both the simulation and experimental results.

유지보수 일정계획을 위한 철도차량용 고무타이어의 비례위험모형 분석

유재윤,정도식,A.J. Endharta,이창재,김심인,권일 한국철도학회 2021 한국철도학회 학술발표대회논문집 Vol.2021 No.11

정상인에서 수면시간대 체위변동에 따른 안압 변화

이응,권정도,Eung Lee,MD,Jeong Do Kwon,MD 대한안과학회 2011 대한안과학회지 Vol.52 No.11

Purpose: The present study examined how intraocular pressure is affected by changes in sleeping posture (22-2400 hours) from the sitting position to the supine, prone, and lateral positions in normal subjects. Methods: Ophthalmological examination was performed on 140 eyes of 70 healthy adult men, and changes in the intraocular pressure were measured according to posture during sleep. The subject was initially relaxed and the base intraocular pressure was measured in the sitting position. In order to reduce the influence of intraocular pressure among the positions, namely, the supine, the prone, and the lateral recumbent positions, the subject was seated for ten minutes before assuming each position. Intraocular pressure was measured twice at 0 and 10 minutes in each position, and the mean of the two values was used for comparison. Results: Compared to the intraocular pressure in the sitting position, intraocular pressure increased significantly in the supine, prone, and lateral positions (p < 0.05). Compared to the base intraocular pressure, the intraocular pressure measured in the prone position showed the largest difference, increasing 6.34 mm Hg in the right eye and 6.43 mm Hg in the left eye. The intraocular pressure measured in the lateral position was 3.62 mm Hg higher in the right eye and 3.63 mm Hg higher in the left eye, and that in the supine position was 2.42 mm Hg and 2.28 mm Hg higher in the right and left eyes, respectively. Conclusions: The change in posture during sleeping from the sitting position to the supine, prone, and lateral positions caused increases in intraocular pressure in normal subjects. The results show that the change in sleeping posture induced by sleeping habits may raise intraocular pressure. J Korean Ophthalmol Soc 2011;52(11):1318-1325

임산부에서 시력저하로 발견된 림프구성 뇌하수체염 1예

김상우,권정도,박도훈,Sang Woo Kim,Jung Do Kwon,Do Hoon Park 대한안과학회 2006 대한안과학회지 Vol.47 No.7

Purpose: To report a rare case of lymphocytic hypophysitis in a 31-year-old woman who presented with gradually progressive bilateral visual loss during the third trimester of pregnancy. Methods: Ophthalmologic examination revealed best corrected visual acuity of 0.02 OD and counting fingers at 20 cm OS. Pupil examination revealed no relative afferent pupillary defect in either eye and intraocular pressure was normal in both eyes. A visual field test revealed nearly total visual defect sparing superotemporal area OD and total defect OS. An MRI of the head was performed. Results: At the time of transsphenoidal surgery following the patient`s delivery, a frozen biopsy of the lesion revealed diffuse lymphocytic infilteration and fibrosis of the pituitary gland consistent with the diagnosis of lymphocytic hypophysitis. Postoperatively the patient was treated for hypopituitarism. At 5 weeks postoperative, her best corrected visual acuity was 1.0 OU, and visual field defects resolved in both eyes. On follow-up by telephone for postoperative 7 months, the patient remained visually asymptomatic. Conclusions: The clinical presentation of lymphocytic hypophysitis may mimic pituitary adenoma, lymphoma, germinoma, and histiocytosis. The diagnosis should be suspected in any pregnant or postpartum patient with an intrasellar or suprasellar mass.

갑상선 기능항진증과 동반된 양안 재발성 후공막염 1예

이응,정상문,권정도,Eung Lee,Sang Moon Jeoung,Jeong Do Kwon 대한안과학회 2010 대한안과학회지 Vol.51 No.12

Purpose: Posterior scleritis is known to be a rare disease. The authors of the present study herein report a case of posterior scleritis, which occurred in a patient’s eye, accompanied by hyperthyroidism and recurring in the other eye one year later. Case summary: A 39-year-old female patient visited the hospital for ocular pain in the left eye and a headache. The patient was diagnosed with posterior scleritis through fundus examination, ultrasonography, CT and MRI, and an effective outcome of treatment was obtained by oral administration of methylprednisolone. Four months after discharge, the patient received left subtotal thyroidectomy for thyroid papillary cancer. Seven months after surgery she visited again, due to ocular pain that started 1 week earlier in the left eye, as well as a headache, and was diagnosed with posterior scleritis upon fundus examination, ultrasonography and MRI. Methylprednisolone was administered orally and an effective treatment result was obtained. After discharge, the patient was followed up for 5 months and did not show any signs of recurrence. Conclusions: When a hyperthyroidism patient has ocular pain or a headache, the possibility of posterior scleritis accompaniment should be considered, as well as the possibility that posterior scleritis, which already occurred in one eye, may recur in the other eye. J Korean Ophthalmol Soc 2010;51(12):1659-1664

스쿠버 잠수활동과 안압, 시신경 및 시야의 변화

정상문,김성길,권정도.Sang Moon Jeoung. MD. Sung Gil Kim. Jeong Do Kwon. MD 대한안과학회 2010 대한안과학회지 Vol.51 No.12

Purpose: To examine how SCUBA diving activities in high-pressure underwater environment affect their intraocular pressure (IOP), visual field (VF), retinal nerve fiber layer (RNFL), and the shape of optic disc. Methods: We performed visual acuity and refractory test, IOP test, VF test, RNFL photography, optical coherent tomography, and 3D optic disc photography for a group of 32 people and a control group of 32 non-divers, and analyzed the differences between the two groups. For the diver group, we conducted a questionnaire survey on the patterns of diving and diving experience, and analyzed their correlation with results of test. Results: Compared to the Control, the diver group showed significant difference in the mean IOP (diver group: 15.71 ± 2.54 mmHg, control group: 14.23 ± 2.15 mmHg, p = 0.019), and abnormal visual field (diver group: 7 eyes (11.3%), control group: 0 eye (0%), p = 0.006). 85.7% of abnormal visual field belonged to early defect. The diver group did not showed significant difference in the shape of optic disc (p = 0.546), but the optic nerve atrophy in shape of optic disc test field (diver group: 8 eyes (12.9%), control group: 2 eyes (3.1%), p=0.042) was significantly different. Conclusions: Divers who did SCUBA diving activities need to have a glaucoma test regularly. Additional research and large cross or longitudinal study are needed to evaluate causes that scuba diving activities affect. J Korean Ophthalmol Soc 2010;51(12):1598-1605

전신 마취하 복강경 수술 시 복강 내압과 체위 변동이 안압에 미치는 영향

송해윤,최종우,권정도,Hae Yoon Song,Jong Woo Choi,Jeong Do Kwon 대한안과학회 2011 대한안과학회지 Vol.52 No.10

Purpose: The present study proposes to examine the change of IOP in response to the rise of abdominal pressure and in response to position change during laparoscopic surgery. Methods: The subjects of the present study included 28 patients who had laparoscopic appendectomy and 20 patients who had laparoscopic cholecystectomy. In both groups, the IOP was measured before surgery, after general anesthesia, after the occurrence of pneumoperitoneum, after position change according to operative method, after the removal of pneumoperitoneum and under general anesthesia. Results: When comparing the IOP before and after the occurrence of pneumoperitoneum, the IOP after the occurrence increased by 3.70 ± 0.96 mm Hg in the appendectomy group and by 3.15 ± 0.5 mm Hg in the cholecystectomy group. After the occurrence of pneumoperitoneum, the IOP measured in the head-low position was 3.25 ± 0.16 mm Hg higher than measured in the level position in the appendectomy group, and the IOP measured in the head-high position was 2 ± 0.12 mm Hg lower than measured in the level position in the cholecystectomy group. Between the 2 groups, there was a significant difference of 6.5 mm Hg in IOP according to the change of head position. Conclusions: In the present study, the occurrence of pneumoperitoneum in laparoscopic surgery increased IOP, and position change according to operative method also changed IOP. In addition, IOP was significantly different between the 2 groups. In order to prevent the patient from being exposed to high IOP for a long period during laparoscopic surgery, keeping the duration of pneumoperitoneum and a head-low position to a minimum may be helpful. J Korean Ophthalmol Soc 2011;52(10):1208-1214