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한국인의 반월상 연골 크기 측정에 대한 Pollard 방법과 자기 공명 영상 측정치 비교
최종혁(Chong Hyuk Choi),이정길(Jeong Gil Lee),송우석(Woo Suk Song) 대한정형외과학회 2007 대한정형외과학회지 Vol.42 No.6
목적: 자기 공명 영상의 반월상 연골 측정치와 비교를 통하여, 반월상 연골의 크기 측정 시 흔히 사용되는 Pollard 방법의 정확도를 알아보고자 하였다. 대상 및 방법: 내외측 반월상 연골 각각 50예를 대상으로, 단순 방사선 전후면 사진 및측면 사진상에서 Pollard 방법으로 반월상 연골의 폭과 길이를 측정하였고, 자기 공명 영상의 관상면 영상에서 반월상 연골의 폭을, 시상면 영상에서 길이를 측정하여 비교하였다. 반월상 연골의 두께도 측정하여 개인차의 정도를 알아보았다. 결과: Pollard 방법에 의한 측정치는 자기 공명 영상 측정치와 비교하여 내측 반월상 연골의 폭(p=0.459)과 외측 반월상 연골의 길이(p=0.108)의 차이는 없었으나, 내측 반월상 연골의 길이는 5.16±2.06 mm 차이를 보였고(p=0.000), 외측 반월상 연골의 폭은 2.15±3.75 mm 차이를 보였다(p=0.001). 내측 및 외측 반월상 연골의 두께는 6.26±0.86 mm와 6.47±0.84 mm로 개인별 차이는 거의 없었다. 결론: Pollard 방법에 의한 내측 반월상 연골의 길이 및 외측 반월상 연골의 크기 측정은 MRI 상에서의 측정치와 차이를 보였으며, 정확한 크기의 연골판 이식을 위하여 Pollard 방법에 의한 측정치의 수정이 필요할 것으로 사료되었다. Purpose: The purpose of this study was to investigate the accuracy of the Pollard method for meniscal sizing of the meniscal allograft by comparison with the MRI dimensions. Materials and Methods: The width and length of 50 medial and lateral meniscl were measured and compared using the Pollard method and MRI. The meniscal thickness was measured using MRI and we evaluated the individual differences. Results: The measurements of the width of the medial meniscus and the length of the lateral meniscus using the Pollard method and MRI were similar (p=0.459, p=0.108, respectively). However, the measurements of the length of the medial meniscus and the width of the lateral meniscus using MRI were significantly higher that those measured using the Pollard method (p=0.000 and p=0.001, respectively). The medial and lateral meniscal thicknesses were 6.26±0.86 mm and 6.47±0.84 mm, respectively, and there was no significant individual difference. Conclusion: The measurements of the length of the medial meniscus and the width of the lateral meniscus, using the Pollard method and on MRI had significant differences. The Pollard method must be modified for meniscal sizing.
Chul-Jun Choi,Yun-Jin Choi,In-Bum Song,Chong-Hyuk Choi 대한정형외과학회 2011 Clinics in Orthopedic Surgery Vol.3 No.2
Background: The clinical and radiologic features of radial tears of the medial meniscus posterior horn were compared with those of horizontal tears. Methods: From January 2007 to December 2008, 387 consecutive cases of medial meniscal tears were treated arthroscopically. Among these, 91 were radial tears in the medial meniscus posterior horn, and 95 were horizontal tears in the posterior segment of the medial meniscus. The patients’ data (age, gender, duration of symptom, body mass index, and injury history), radiographic findings (Kellgren and Lawrence score, posterior tibial slope, and femorotibial angle), and chondral lesions were recorded. Results: The patient factors of age, gender, and body mass index were related to radial tears of the medial meniscus posterior horn. Radial tears were significantly correlated with Kellgren and Lawrence score, varus alignment, posterior tibial slope, and severity of the chondral lesion. Conclusions: Radial tears of the medial meniscus posterior horn are a unique clinical entity that are associated with older age, females and obesity, and are strongly associated with an increased incidence and severity of cartilage degeneration compared to horizontal tears.
시뮬레이티드 어닐링을 이용한 유성치차열의 최적설계에 관한 연구
최용혁,정태형,이근호 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
A planetary gear trains has characteristics in compactness, power transformation ability and constant meshing. Usability is increased in applications of auto transmission and industrial gearbox. Study on optimum design of planetary gear train has been progressed on minimization of weight, miniaturization of planetary gear train and improvement of high strength. There are demands of study for the planetary gear train required long life estimation. In this work, being considered life, strength, interference, contact ratio and aspect ratio, the optimum design algorithm is proposed to reduce the volume of planetary gear train with transferring the same amount of power. In the design of algorithm for planetary gear train, the determination of teeth number is separated to achieve simplicity and the simulated annealing method as a global optimal technique is used for optimal design method.
Chong, Eugene,Kim, Sarah,Choi, Jun-Hyuk,Choi, Dae-Geun,Jung, Joo-Yun,Jeong, Jun-Ho,Lee, Eung-sug,Lee, Jaewhan,Park, Inkyu,Lee, Jihye Springer 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1
<P>Fabrication of ZnO nanostructure via direct patterning based on sol-gel process has advantages of low-cost, vacuum-free, and rapid process and producibility on flexible or non-uniform substrates. Recently, it has been applied in light-emitting devices and advanced nanopatterning. However, application as an electrically conducting layer processed at low temperature has been limited by its high resistivity due to interior structure. In this paper, we report interior-architecturing of sol-gel-based ZnO nanostructure for the enhanced electrical conductivity. Stepwise fabrication process combining the nanoimprint lithography (NIL) process with an additional growth process was newly applied. Changes in morphology, interior structure, and electrical characteristics of the fabricated ZnO nanolines were analyzed. It was shown that filling structural voids in ZnO nanolines with nanocrystalline ZnO contributed to reducing electrical resistivity. Both rigid and flexible substrates were adopted for the device implementation, and the robustness of ZnO nanostructure on flexible substrate was verified. Interior-architecturing of ZnO nanostructure lends itself well to the tunability of morphological, electrical, and optical characteristics of nanopatterned inorganic materials with the large-area, low-cost, and low-temperature producibility.</P>