쇼트피닝 가공 Ti-6Al-4V의 추가 표면 가공에 따른 부식 저항

오성훈(Sunghun Oh),정성균(Seong-Kyun Cheong),신기훈(Ki-Hoon Shin) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.2

철도 차량용 방진고무의 온도에 따른 뮬린스 효과

오성훈(Sunghun Oh),이수영(Su-Yeong Lee),유지혜(Jihye You),김홍석(Hong Seok Kim),정성균(Seong-Kyun Cheong),신기훈(Ki-Hoon Shin) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.2

냉동식품 번들용 테이핑 머신의 유한요소해석

오성훈(Sung-Hun Oh),정종설(Jong-Seol Jeong),정성균(Seong-Kyun Cheong),신기훈(Ki-Hoon Shin) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12

PCB 기구와 이종골을 이용한 경추체간 전방 유합술

박정현,오성훈,이형중,김주헌,김영수,고용,김광명,오석전,Park, Jeong Hyun,Oh, Seong Hoon,Yi, Hyeong Joong,Kim, Ju Heon,Kim, Young Soo,Ko, Yong,Kim, Kwang Myung,Oh, Suck Jun 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.11

Objective : PCB cervical instrument is a newly introduced fusion device which comprises cervical plate, cage (spacer) and screw system. It is developed to enhance fusion rate and stability, as well as to reduce complications related to hardware failure. We investigated the efficacy of clinical and radiological results of PCB instrument and Lubboc bone. Methods : From August, 1998 to October, 1999, authors performed 54 cases of anterior cervical interbody fusion with PCB instrument and Lubboc bone. Retrospective analysis was undertaken based on clinical and radiological findings. Clinical improvement was evaluated according to Odom's criteria. Cervical plain films and tomography were taken every 2 months to evaluate the degree of interbody fusion and disc height changes. Results : Bone fusion was observed in 36 cases(90%) over 6 months after operation, and during which time there was no significant interval change. There were 3 cases of hardware dislodgement. Disc height was increased significantly and preserved in all cases. Clinical outcome over good degree was seen more than 94% of patients. Conclusion : Longer follow-up period and comparative studies to similar instrument appear to be necessary, but this instrumentation system has shown high fusion rate and fewer adverse effects in our series. We believe this system might be indicated for the treatment of cervical trauma and degenerative disease in selective cases.

퇴행성 요추 질환에서 후방경유 추체간 유합술과 360° 고정술의 비교

이녹영,오성훈,이우택,배재성,이형중,김영수,고용,김광명,오석전,Lee, Nok Young,Oh, Seong Hoon,Rhee, Woo Tack,Bae, Jae Seong,Yi, Hyeong Joong,Kim, Young Soo,Ko, Yong,Kim, Kwang Myung,Oh, Suck Jun 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.10

Objectives : The goal of operation for degenerative lumbar diseases is to relieve radiculopathy and low back pain and to prevent further degeneration. The authors analyzed the surgical results of posterior lumbar interbody fusion(PLIF) and $0^{\circ}$ fixation to evaluate the proper treatment policy in spinal stenosis, degenerative spondylolisthesis and low grade isthmic spondylolisthesis. Material and Methods : The authors performed PLIF on 92 patients and $0^{\circ}$ fixation on 138 patients with spinal stenosis, degenerative spondylolisthesis and low grade isthmic spondylolisthesis. We retrospectively studied clinical outcomes and subjective satisfaction of these patients by several criteria such as visual analog scale(VAS), Prolo's economic and functional outcome scale, medication usage after operation and questionaire for overall outcome. Result : Pre- and postoperative VAS on back pain and leg pain showed decrease of pain from 6.5, 6.7 to 2.2, 2.4 in PLIF group and from 7.0, 7.2 to 2.5, 2.7 in $0^{\circ}$ fixation group. Excellent and good outcomes on Prolo's scale were 81.5% in PLIF group and 82.6% in $0^{\circ}$ fixation group. Medication usage after operation was reduced in 79.3% of PLIF group and in 78.3% of $0^{\circ}$ fixation group. Patients' self-reported overall success of their procedure showed 82% in PLIF group and 84% in $0^{\circ}$ fixation group. Conclusion : Both PLIF and $0^{\circ}$ fixation showed good outcomes and provided biomechanically stable fusion in spinal stenosis, degenerative spondylolisthesis and low grade isthmic spondylolisthesis. Therefore, only PLIF seems necessary and considered a proper surgical treatment for these disorders.

요추간반 탈출증에 있어 MED(Microendoscopic Discectomy) System을 이용한 수술의 효율성과 수기

홍현종,오성훈,백광흠,김재민,김충현,김영수,고용,오석전,김광명,이상구,김남규,Hong, Hyun Jong,Oh, Seong Hoon,Bak, Kwang Hum,Kim, Jae Min,Kim, Choong Hyun,Kim, Young Soo,Ko, Yong,Oh, Suck Jun,Kim, Kwang Myung,Lee, Sang Gu,Kim, Nam Kyu 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.1

Objective : Percutaneous lumbar approaches such as arthroscopic discectomy, laser discectomy, and nucleotome remain controversial and have technical limitations to free fragment disc, bony pathology and access to L5-S1, The purpose of this study was to determine efficacy of this new endoscopic system and to report techniques and tactics. Methods : From July 1997 to May 1998, we treated 40 consecutive patients(43 levels) with the MED system. Mean age was 32 years(range ; 18 to 62). There were 30 males and 10 females. All patients had sciatica with SLRT limitation. There were 23 patients with disc herniation at L4-5 and 14 patients at L5-S1. Three patients had 2 level disc herniations. There was one far lateral disc herniation at L4-5. Results : Using modified MacNab criteria, there were 37 excellent results and 3 good result. Most patients were discharged within 3-4 days except 2 patients with dural tearing. There were no other complications. Mean operation time was 1.5 hours(range : 40 minutes to 2.5 hours). Conclusion : The MED system is a reliable approach to lumbar disc herniations. This system combines the advantages of conventional open surgery and a minimally invasive technique. As tactics for the doctors who wish to attempt, "palpate" the lamina by first dilator, identification of interlaminar space by removal of overlying soft tissue and confirmation of the shoulder portion of nerve root before discectomy are important to this procedure. We conclude that lumbar disc herniations can be successfully treated with MED approach.

소멸형 잔반처리기 수분조정제 개발에 관한 연구

채성준(Seong Joon Chae),문정호(Jeong Ho Moon),박윤서(Yun Seo Park),박상규(Sang Kyu Park),오성훈(Seong Hoon Oh) 유기성자원학회 1997 유기물자원화 Vol.5 No.1

음식쓰레기의 처리가 사회적인 문제로 대두되기 시작한 지도 얼마되지 않았다. 하지만 이의 처리방법에 대해서는 여러해 전부터 많은 논란을 일으켜 온 것이 사실이다. 현재 국내 벚 일본에서 크게 관심을 가지고 있는 처리방식으로는 음식쓰레기를 고옴으로 건조시키는 방법과 일정량의 담체 (수분조정제)를 반응조의 내부에 담아 놓고 일정기간동안 계속적으로 투입하면서 미생물에 의한 분해가 일어날 수있도록 하는 소멸방식이 있다. 본 연구실에서는 위의 두가지 방식 중 소멸형의 잔반처리기에 관심을 가지고 이의 효율적인 음식물 분해를 위한 조건설정에 대해 실험을 진행하게 되었고 얼차척으로 음식물이 투업되고 난후 미생물과의 직접적인 접촉을 이루어지게 하는 수분조정제를 개발하기 위한 실험을 진행하게 되었다. 이를 위해 수분조정제로 쓰일 물질의 선정과 초기 미생물의 성장을 극대화시킬 수 있는 물질의 첨가에 의한 개선, 탈취 흡착제의 첨가에 의한 반응시 발생효}는 악취의 농도 변화 등에 대해 실험을 진행하게 되었고, 이에 대한 양호한 결과를 얻게 되었다. 1t is not long since treatment of food waste became a social problem. However, it is a fact that there have been a lot of debates on the treatment of food waste since several years ago. At present, two ways of disposing food waste are under great interest in Korea and Japan. One is drying of food waste at high temperature. The other is disappearance type , in which analysis by microorganism takes place with continuous supply of a bulking agent for a certain period of time that was stored in a reactor. 1n our laboratory, Disappearance type Food Waste Disposer is under interest, and experiments regarding condition establishment for efficient analysis of food waste were conducted. As preceding experimentation, experiments were done with regard to the selection of a substance to be used as a bulking agent, improvement by addition of a substance which maximizes initial growth of microorganism, and a concentration change in rank odors generated by reaction with deodorizer (absorbent). The results turned out to be satisfactory.

재발된 누선과 안와 선양낭포암에 대한 전안와제거술 - 증례보고 -

박정현,김영수,최희윤,고용,오성훈,오석전,Park, Jeong Hyun,Kim, Young Soo,CHoi, Hee Yoon,Ko, Yong,Oh, Seong Hoon,Oh, Suck Jun 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.3

A 54-year-old woman presented with an exophthalmos and a mass on her right eye, which proved to be recurred adenoid cystic carcinoma of the lacrimal gland. Orbital CT and MRI showed that tumor was located in the right orbit, but skin over right eye brow was also involved. There was no visualization of tumor extension into the intracranial compartment. The authors have performed an en bloc orbitectomy. Although en bloc orbitectomy is known to be useful in reducing recurrence, this case showed the tumor recurrence and even distant metastasis that occurred after total tumor removal via en bloc orbitectomy. As adenoid cystic carcinoma of lacrimal gland is known to have high rate of recurrence and metastasis, en bloc orbitectomy should be performed to reduce local advancement and distant metastasis. In case of distant metastasis, radiotherapy could be useful strategy in selected case.

요추부 불안정증의 방사선학적 소견

양경훈,김남규,김영수,고용,오성훈,오석전,김광명,Yang, Kyoung Hoon,Kim, Nam Kyu,Kim, Young Soo,Ko, Yong,Oh, Seong Hoon,Oh, Suck Jun,Kim, Kwang Myung 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.1

Objective : Lumbar spinal instability occurs when normal biomechanics support in lumbar vertebrae interrupted. Despite the recent enthusiastic studies, the precise radiological assessment has not been fully established, yet. Therefore, we carefully studied our cases to analyze the radiologic findings in lumbar spinal instability. Patients and Methods : We have put together radiological analysis and assessment based on 38 patients who have been diagnosed and treated for lumbar spinal instabilities from June 1994 to December 1998, Patients who have been diagnosed and treated for trauma were excluded from study. Results : The outcomes are as follows : 1) Lumbar lordotic curve was statistically significant in unstable group by 23.7, compared to the control group ($17.0^{\circ}$). 2) According to the resting x-ray, sagittal plane angulation measured on unstable group was $21.1^{\circ}$, control group $18.0^{\circ}$. Therefore unstable group was noticeably higher(p<0.01). 3) According to the resting x-ray sagittal plane displacement, unstable group had 4.3mm, the comparison had 1.2mm. Therefore measurement from the unstable group were significantly higher(p<0.01). 4) According to stress view, sagittal plane translation was 4.1mm for the unstables and 2.7mm for the comparisons. Therefore unstables were noticeably higher(p<0.01). 5) According to stress view, sagittal plane rotation was $15.1^{\circ}$ at L3-4, $22.0^{\circ}$ at L4-5, $27.9^{\circ}$ at L5S1 for the unstable group and $11.3^{\circ}$, $18.1^{\circ}$, $21.0^{\circ}$ each for the comparison. 6) Facet angle for unstable group, left $29.3^{\circ}-61.5^{\circ}$, right $24.4^{\circ}-63.2^{\circ}$ and the mean for each are $43.1^{\circ}$, $47.2^{\circ}$. The difference between left and right facet angle was $3.5^{\circ}-20.7^{\circ}$ and the mean value $15.3^{\circ}$. Facet angle for the comparisons for the left was $29.3^{\circ}-59.5^{\circ}$, right was in between $25.7^{\circ}-64.5^{\circ}$ range and the each mean are $44.9^{\circ}$ and $47.6^{\circ}$. Also, the difference between left and right facet angle was $4.1^{\circ}-9.3^{\circ}$ and the average was $17.1^{\circ}$. The average and the difference between the left and right angle are found not to have statistic necessity for both unstable and stable measurements(p>0.01). 7) 19 patients were found to have vacuum facet phenomenon among unstable group etc. results were collected. Conclusion : According to above results, we attempted to prepare the application to the patient of radiological analysis and assessment for lumbar spinal instability early checkup.

미세혈관 감압술중 뇌간청각유발전위 감시장치의 유용성

김태준,고용,김영수,오성훈,김광명,오석전,Kim, Tae Joon,Ko, Yong,Kim, Young Soo,Oh, Seong Hoon,Kim, Kwang Myung,Kim, Nam Kyu,Oh, Suck Jun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.5

Objective : Surgery for the microvascular decompression is mostly concerned with injury to the cranial nerves or brain stem by cerebellar retraction. Intraopeartive brain stem auditory evoked potentials(BAEPs) has been continuously monitored on surgery to evaluate the extent of injury, recovery of the nerves and prognosis. Methods : Of the 161 cases of CP angle surgery from Feb. 1996 to Apr. 1998, 103 cases were monitored during operation. Thirty five patients who had undergone similar surgery were selected and evaluated ; 23 patients were monitored and 12 were not during surgery. If monitor showed more than 0.5 mSec delay of latency, surgeon was given a warning not to retract brain any more. If more than 1mSec delay, surgeon was informed to stop surgery and wait for the returning of evoked potentials. The level of amplitudes and delay of latencies during the initial stage of operation, opening the dura, insertion of teflon patches, and closing the dura and recovery were then compared. Resuls : Twenty patients were male and 15 were female. Their average age was 50.26 years. Mean amplitude during the initial stage of operation was $0.60{\pm}0.25mV$, at opening the dura $0.56{\pm}0.26$, after teflon patches insertion $0.49{\pm}0.20$, and after closure of dura $0.47{\pm}0.28mV$. Mean latency during the early stage of operation was $6.08{\pm}0.67mSec$, at opening of dura $6.38{\pm}0.55$, insertion of teflon $6.97{\pm}0.59$, and closing the dura $6.17{\pm}0.54$. There was statistical significance in the difference of amplitudes between each procedures, and in the difference of latencies. For the complete recovery of amplitude and latency, it usually took average 5.65 minutes(0-20 min). In monitored group, only one patient required more than 20 minutes to recover and suffered from hearing disturbance after surgery. Others were recovered within 10 minutes without complications. However, 4 out of 12 patients who were not monitored showed hearing disturbance, and 1 patient had temporary facial palsy and dizziness(p=0.000). Conclusion : The results indicate that continuous intraoperative monitoring of BAEPs during CP angle surgery is seen mandatory procedure to prevent operative complications.