경추 퇴행성 질환 환자에서 Cage만을 이용한 2구간 경추 감압술 및 골유합술

이호범,박찬우,유찬종,김우경,이상구,김석민 대한척추신경외과학회 2009 Neurospine Vol.6 No.3

Objective: Anterior cervical discectomy and fusion (ACDF) is a highly successful surgical treatment for nerve root or spinal cord compression caused by disc herniation or spondylosis. Multilevel cervical discectomy usually requires plate and screw fixation for adequate bony fusion and stability. But the use of plate and screw fixation may cause some post-operative complications. So in this study we evaluate the safety and effectiveness of two-level ACDF with carbon or polyetheretherketone (PEEK) cages without cervical plate in cervical degenerative disc disease. Methods: We retrospectively analyzed 18 patients who underwent two-level ACDF with carbon or PEEK cages from February 2002 to August 2008. The mean follow-up period was 31months. Clinical, radiologic and surgical morbidities were assessed in all cases. Outcome assessment was done using Odom’s criteria and visual analogue scale (VAS) score. Radiological assessment was done with bony fusion rate, linear measure of cervical lordosis, cervical lordotic angle and cage subsidence. Results: Radiculopathy was improved in all cases (100%) after surgery, whereas myelopathy was resolved in three of five patients (60%). Radiographic evidence of fusion was found in all patients (100%) at last follow-up. Preoperative mean VAS score was 8.1 compared with a postoperative score 2.5 (p<0.05). The clinical outcome was excellent or good in 16 cases (89%). There were no serious complications such as dislodgement of cages, hardware failure, infection and neurologic deterioration. Linear measure of cervical lordosis at last follow-up was increased from 2.72 ± 1.12 mm to 7.84 ± 1.09 mm. Cervical lordotic angle at last follow-up was increased from 8.9 ± 2.76° to 15.1 ± 2.38°. The mean loss of disc height was 1.40 mm during the follow-up period. However development of subsidence did not influence on clinical outcomes. Conclusion: ACDF in two-level stand-alone cages is a safe and effective procedure in multilevel cervical degenerative diseases. In spite of subsidence, interbody fusion with cages provides load-sharing function and stabilization of the cervical spine by increasing segmental rigidity, thus yielding excellent fusion rates and less graft failure, even in twolevel cervical diseases. Objective: Anterior cervical discectomy and fusion (ACDF) is a highly successful surgical treatment for nerve root or spinal cord compression caused by disc herniation or spondylosis. Multilevel cervical discectomy usually requires plate and screw fixation for adequate bony fusion and stability. But the use of plate and screw fixation may cause some post-operative complications. So in this study we evaluate the safety and effectiveness of two-level ACDF with carbon or polyetheretherketone (PEEK) cages without cervical plate in cervical degenerative disc disease. Methods: We retrospectively analyzed 18 patients who underwent two-level ACDF with carbon or PEEK cages from February 2002 to August 2008. The mean follow-up period was 31months. Clinical, radiologic and surgical morbidities were assessed in all cases. Outcome assessment was done using Odom’s criteria and visual analogue scale (VAS) score. Radiological assessment was done with bony fusion rate, linear measure of cervical lordosis, cervical lordotic angle and cage subsidence. Results: Radiculopathy was improved in all cases (100%) after surgery, whereas myelopathy was resolved in three of five patients (60%). Radiographic evidence of fusion was found in all patients (100%) at last follow-up. Preoperative mean VAS score was 8.1 compared with a postoperative score 2.5 (p<0.05). The clinical outcome was excellent or good in 16 cases (89%). There were no serious complications such as dislodgement of cages, hardware failure, infection and neurologic deterioration. Linear measure of cervical lordosis at last follow-up was increased from 2.72 ± 1.12 mm to 7.84 ± 1.09 mm. Cervical lordotic angle at last follow-up was increased from 8.9 ± 2.76° to 15.1 ± 2.38°. The mean loss of disc height was 1.40 mm during the follow-up period. However development of subsidence did not influence on clinical outcomes. Conclusion: ACDF in two-level stand-alone cages is a safe and effective procedure in multilevel cervical degenerative diseases. In spite of subsidence, interbody fusion with cages provides load-sharing function and stabilization of the cervical spine by increasing segmental rigidity, thus yielding excellent fusion rates and less graft failure, even in twolevel cervical diseases.

이미지 분석기법을 이용한 콘크리트 구조물의 균열 검출 시스템 개발

이호범,김종우,장일영 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회 논문집 Vol.16 No.1

본 연구에서는 디지털 이미지 분석기술을 이용하여 콘크리트 구조물의 대표적인 열화인자인 콘크리트의 균열을 검지할 수 있는 기술을 개발하기 위해 형태수리학에 근거한 모폴로지 기법이 도입된 이미지 분석기법을 적용한 균열검출 시스템을 개발하였다. 개발된 시스템에는 분석결과의 효율적인 관리를 고려하여 촬영된 다수의 이미지를 하나의 전체 이미지로 재구성하는 이미지 조합기술이 추가로 적용되었다. 그리고 개발된 시스템의 적용성 및 신뢰도 검증은 균열이 발생된 콘크리트 암거를 이용한 현장검증 실험을 통해 이루어졌으며, 실험에 사용된 촬영장비로는 40m까지 0.2mm의 균열을 검지할 수 있는 성능을 확인하였다. 이미지 분석을 통해 산정된 균열폭의 경우 실측 균열폭과의 차이가 최대 0.08mm로 나타나 일정 수준 이상의 정확도를 구명하였고, 이미지 조합의 경우 추상 패턴 이미지 면에 대한 분할 촬영 이미지를 조합한 결과 실제 전체촬영 원본 이미지와 육안으로 차이를 확인할 수 없을 정도로 우수한 조합결과를 도출하였다. In this study, the crack detecting system with digital image processing techniques based on the mathematical morphology method was developed to detect cracks in concrete structures. In the developed system, the image combining technique of reconstructing multiple images as an entire single image considering efficient management of analysis results was applied as an additional module. The developed system was verified through a field test with the cracked concrete culvert and the crack width of 0.2 mm was able to be detected in the 40m span. In the image analysis, the difference between calculated crack width and actual crack width were less than 0.08mm. For image combination in the stitching test of pattern images, the stitched image was identical with the original picture of entire subject in the visual perception level.

소면적 작물 오미자(Schisandra chinensis)에 대한 농약의 안전사용기준 설정

이호범,이영철,최세정,김은제,김현왕,김예진,조연수,조서연,김용석 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.5

반도체 정밀 생산기기 방$\cdot$제진을 위한 미진동 Design Guide Line 해석

이호범 한국공기청정협회 1999 空氣淸淨技術 Vol.12 No.1

식생이 다른 계류수의 수질영향인자에 관한 연구

이호범,이중기,하훈,김양기,박찬오,박혜영,박송인,허남칠,신대윤,북도순이 대한환경공학회 2006 대한환경공학회 학술발표논문집 Vol.2006 No.12

구조물에 대한 진동 및 진동제어 방법에 관한 해석

이호범 한국공기청정협회 1996 空氣淸淨技術 Vol.9 No.2

실험적 응력해석의 IITC 방식에 의한 콘크리트 구조물 잔류응력 평가

이호범,한상희,장일영,Lee, Ho Beom,Han, Sang Hee,Jang, Il Young 대한토목학회 2014 대한토목학회논문집 Vol.34 No.2

기존 콘크리트 구조물 내력은 변위 및 스트레인 게이지를 통해 기지의 가력에 따른 변화량을 계측하고, 그 결과를 수치해석 결과와 비교하여 평가한다. 이는 결과적으로 현존 콘크리트의 잔류응력을 계측 평가하므로써 완성될 수 있다. 본 논문은 실험적 응력해석법의 일환으로 콘크리트 구조물에 대한 잔류응력을 비파괴적인 방식으로 평가하는 IITC (Instrumented Indentation Technique for Concrete) 시스템 개발과 관련된 것으로 콘크리트 구조물 표면에서 압입하중과 압입깊이와의 상관관계를 이용한 실험적 평가방법을 논하였다. 본 연구에서는 구성되는 H/W 및 분석용 S/W는 새롭게 개발하였으며, 다각도의 실험결과를 이용하여 콘크리트 구조물에서의 실험적 잔류응력 추정식을 창출하였고, 자동으로 잔류응력을 평가케 함으로써 콘크리트 구조물의 축성단계에서부터 유지관리 단계에까지 자유롭게 내력을 산정할 수 있도록 하였다. The carrying capacity of existing concrete structures is evaluated by the measured data from displacement and strain gauges for given loads and the results of numerical analysis that are compared with the measured ones. Consequently, this process could be accomplished in doing the direct measurement of residual stress on existing concrete. This study is concerned with the development of IITC (Instrumented Indentation Technique for Concrete) system which is based on the experimental stress analysis technique using non-destructive test method to evaluate the residual stress of concrete structures depending on the types of applied loadings in analysing indentation load - indentation depth curve derived experimentally on concrete surface. As a result, in this paper, almost all of systematized H/W and S/W were newly developed to estimate the residual stresses of concrete structures. Thus, the creation of new experimental equations for deriving residual stresses and automatical calculations of residual stresses using the empirical formula can lead to evaluate the structural resistances conveniently in the structures from construction phase to maintenance stage.

반도체공장 클린룸 구조에서의 미진동 연구

이호범 한국공기청정협회 1992 空氣淸淨技術 Vol.5 No.2

추간반 및 후관절의 퇴행 정도를 이용한 요추 불안정 판단의 임상적 유용성

이호범,박찬우,이상구,김우경,유찬종 대한척추신경외과학회 2009 Neurospine Vol.6 No.3

Objective: Treatment for symptomatic lumbar stenosis is usually surgical decompression and additional global fusion is recommended for patients with segmental instability. The aim of this article is to evaluate that degeneration degree of the disc and facet joint could be the indicator of judgment for segmental instability. Methods: We retrospectively reviewed 84 patients who underwent surgical treatment for lumbar spinal stenosis. Patients in Group 1 (30 patients) with radiological instability underwent decompression with global fusion, patients in Group 2 (54 patients) without radiological instability underwent decompression with global fusion or decompression only according to the existence and nonexistence of clinical instability. Magnetic resonance images were used to assess the disc degeneration from Grade I (normal) to Grade V (advanced) and the facet joints degeneration from Grade 0 (normal) to Grade 3 (advanced). All patients were checked with the simple X-ray stress view and evaluated. Results: Severity of the disc degeneration had no significant association with the segmental instability, and no correlation with the facet joint degeneration. Severity of facet joint degeneration had significant correlation with the radiological instability. The segmental instability was increased with increasing severity of facet joint degeneration, especially translation. There was a significant association between facet joint degeneration and clinical instability. The facet joint degeneration was increased in patients with clinical instability. Conclusion: Our results suggest that the facet joint degeneration may be the useful indicator of judgment for segmental instability Objective: Treatment for symptomatic lumbar stenosis is usually surgical decompression and additional global fusion is recommended for patients with segmental instability. The aim of this article is to evaluate that degeneration degree of the disc and facet joint could be the indicator of judgment for segmental instability. Methods: We retrospectively reviewed 84 patients who underwent surgical treatment for lumbar spinal stenosis. Patients in Group 1 (30 patients) with radiological instability underwent decompression with global fusion, patients in Group 2 (54 patients) without radiological instability underwent decompression with global fusion or decompression only according to the existence and nonexistence of clinical instability. Magnetic resonance images were used to assess the disc degeneration from Grade I (normal) to Grade V (advanced) and the facet joints degeneration from Grade 0 (normal) to Grade 3 (advanced). All patients were checked with the simple X-ray stress view and evaluated. Results: Severity of the disc degeneration had no significant association with the segmental instability, and no correlation with the facet joint degeneration. Severity of facet joint degeneration had significant correlation with the radiological instability. The segmental instability was increased with increasing severity of facet joint degeneration, especially translation. There was a significant association between facet joint degeneration and clinical instability. The facet joint degeneration was increased in patients with clinical instability. Conclusion: Our results suggest that the facet joint degeneration may be the useful indicator of judgment for segmental instability

기초침하에 의해 손상된 송전철탑 구조물의 구조성능개선

이호범,박종권,김일수,장일영,송재호 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 논문집 Vol.17 No.2

일반적으로 송전철탑 부재들의 보강은 적절한 그라우팅재를 활용한 인젝션과 구조 보강재 부착을 이용한 단면 확장에 따른 강성보강 방식을 주로 사용한다. 이와 같은 그라우팅 인젝션 및 단면보완은 주로 축력능력을 확장시키는 데에 의미를 갖는다. 그렇지만 보다 안정적 상태를 유지케 할 수 있는 보강방안이 적극 요구되는데 그 방법은 좌굴에 의해 손상을 받은 부재를 원상태의 길이로 환원시키고, 또한 내부적 보강효과를 동시에 갖는 새로운 부재로 교체하는 것이다. 본 연구에서는 기초침하로 구조적 손상을 받은 송전철탑의 손상회복을 위한 실증적 과정으로 우선 현장에서의 손상도 확인점검과 손상상태 및 회복상태에 대한 수치 해석적 결과를 도출하였고, 새롭게 고안한 잭킹시스템을 이용하여 보강된 부재를 교체하는 과업을 수행하였다. 이 결과는 송전철탑 유지관리의 차원상승 효과를 갖게 한다. Generally the capacities of electric power transmission tower's members are improved by increasing their stiffness nature through injection of grout or attachment of other structural stiffeners. Those are for upgrading their axial strength by fulfillment of proper materials into pipe members, increment of member dimension by addition of section, or a combination of the two. However the use of innovative and unusual procedures would be positively recommended for getting more stable state. It is that buckled members are replaced with lengthened and strengthened members. In providing the structural restoration procedures for the existing electric power transform tower whose main members have been damaged due to unequal foundation settlement, structural damage inspection works and numerical analyses for the damaged one and the restored one were done in detail at first. secondarily member-exchanging works using a newly-generated jacking system and strengthened members were achieved. This figures are to point clearly to inherent advantages attending the management of the towers.