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박재성,전종배,최희영,Jae Sung Park,Jong Bae Jeon,Hee Young Choi,Ph,D 대한안과학회 2007 대한안과학회지 Vol.48 No.8
Purpose: We assessed the relationship between the surgical outcome of intermittent exotropia and initial postoperative alignment by checking it on the first postoperative day or the day of strabismus surgery. Methods: Seventy-three patients with intermittent exotropia underwent bilateral lateral rectus recession or unilateral medial rectus resection and lateral rectus recession. Thirty-two patients had their postoperative alignment checked on the day of surgery, and forty-one patients were checked on the first postoperative day. Success was defined as sustained alignment six months postoperatively from esotropia 10PD to exotropia 10PD. Overcorrection was defined as esotropia greater than 11PD, and undercorrection was exotropia greater than 11PD. We assessed the relationship between the alignment on the day of surgery or on the first postoperative day and also at six months postoperatively, as well as the success rate according to the initial postoperative alignment. Results: There was a statistically significant relationship between alignments on the day of surgery or on the first postoperative day and those at six months postoperatively (p<0.001, p<0.001). The deviation on the first postoperative day had a greater correlation coefficient compared to the deviation on the day of the operation (Pearson correlation coefficient=0.704, and 0.593, respectively). The alignment of overcorrection ranged from 11~20PD on the day of surgery, and on the first postoperative day it produced a relatively high success rate (p=0.016, p=0.035). There was no statistically significant difference in the success rate between the two types of surgery (p=0.832). Conclusions: The alignment on the day of surgery showed a high correlation to the outcome on the sixth postoperative month in intermittent exotropia patients. The initial postoperative overcorrection of 11 to 20PD on the day of surgery and on the first postoperative day resulted in the best long-term outcomes.
약시, 시신경위축, 시신경염에서의 시유발전위 비교 연구
이석재(Seok Jae Lee),전종배(Jong Bae Jeon),박영민(Young Min Park),이종수(Jong Soo Lee) 대한검안학회 2015 Annals of optometry and contact lens Vol.14 No.4
Purpose: This study evaluated diagnostic use of pattern reversal visual evoked potential between amblyopia, optic atrophy, and a control group. Methods: We retrospectively examined 63 patients with amblyopia, 39 patients with optic atrophy causing decreased visual acuity and 148 patients as the control group for pattern reversal-visual evoked potential (PR-VEP) results. We compared with control group and ocular disease group based on the mean value of P100 latency, N1-P1 amplitude. The comparision with P100 latency ratio and P100 amplitude ratio was performed to confirm the difference between amblyopia and optic atrophy. Results: The mean value of P100 latency (msec) in the control group was 100.98 ± 7.76, 111.19 ± 16.00 in amblyopia, 121.88 ± 24.56 in optic atrophy and showed significant delay in both diseases (p ˂ 0.001). The mean value of amplitude (μV) in the control group was 7.40 ± 5.34 of N1-P1, 6.47 ± 3.24 in amblyopia and 4.33 ± 2.32 in optic atrophy and showed significant decrease in both diseases (p ˂ 0.001). The value of P100 latency ratio (p = 0.041) and P100 amplitude ratio (p = 0.042) between amblyopia and optic atrophy showed significant difference and there was a positive correlation for difference of visual acuity in both eyes and P100 amplitude ratio (r = 0.723, p = 0.002) and P100 latency ratio (r = 0.589, p ≤ 0.001). Conclusions: We found a significant delay of P100 latency and decreasing P100 amplitude in amblyopia and optic atrophy compared to the control group. There was a statistical difference of P100 amplitude ratio and P100 latency ratio between two diseases and this is probably because the difference of visual acuity in amblyopia is significantly smaller than optic atrophy.
STS304의 후열처리에 따른 용접부 미세조직과 기계적 특성 평가
장대한 ( Daehan Jang ),김광윤 ( Kwangyoon Kim ),김형찬 ( Hyoung Chan Kim ),전종배 ( Jong Bae Jeon ),남대근 ( Dae-geun Nam ),손근용 ( Keun Yong Sohn ),김병준 ( Byung Jun Kim ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.9
Abstract: Austenitic stainless steels have excellent mechanical property and corrosion resistance, and are for these reasons used in demanding applications such as power plant, nuclear reactor and off-shore plant. Especially, austenitic stainless steel 304 (STS304) is mainly used as a pipe material in nuclear power plants. Submerged arc welding (SAW) is a commonly used method of welded steel pipes. This method has some problems of microstructure and mechanical properties such as heterogeneous microstructure, ductility decreases, brittleness of a weld region after SAW process. Especially, delta ferrite and dendrite structure is happened in the weld metal after welding process, which affects the decrease of toughness and ductility. Therefore, it requires the post weld heat treatment (PWHT) in order to solve these problems. In this study, welded STS304 was investigate the microstructure and mechanical properties after SAW process. In order to improve the toughness and ductility of weld region, PWHT was performed by controlling the delta-ferrite and dendrite structure. It was found that the mechanical property of the weld region were increased due to the decrease of the delta- ferrite and the recrystallization of the austenite structure after PWHT. (Received March 30, 2017; Accepted May 31, 2017)