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레이놀즈응력모델을 이용한 난류의 고분자물질 첨가 저항감소현상에 대한 수치해석
고강훈,김광용,Ko, Kang-Hoon,Kim, Kwang-Yong 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.1
A modified low-Reynolds-number Reynolds stress model is developed for the calculation of drag-reducing turbulent flows induced by polymer injection. The results without polymer injection are compared with the results of direct numerical simulation to ensure the validity of the basic model. In case of drag reduction, profiles of mean velocity and Reynolds stress components, in two-dimensional channel flow, obtained with a proper value of viscosity ratio are presented and discussed. Computed mean velocity profile is in very good agreement with experimental data. And, the qualitative behavior of Reynolds stress components with the viscosity ratio is also reasonable.
이우천,남기헌,박현수,라종득,이철,고강훈,Lee, Woo-Chun,Nam, Ki-Heon,Park, Hyun-Su,Rha, Jong-Deuk,Lee, Cheol,Ko, Kang-Hoon 대한족부족관절학회 2001 대한족부족관절학회지 Vol.5 No.1
Purpose: to investigate the etiology and the results of surgical treatment of the symptomatic accessory navicular in adults. Materials and Methods: Between 1996 and 2000, 17 cases in 16 adult patients who were older than 20 years were diagnosed as painful accessory na vicular. 11 patients could recall a twisting injury of the ankle, and 8 of them were inversion sprain. 4 patients had tibialis posterior tendon lesions. 13 feet of 12 patients were treated by resection of accessory navicular, the synchondrosis, the medial portion of the navicular and reattachment of tibialis posterior tendon without transposition. 9 feet in 8 patients were followed for more than one year after surgery. In 4 patients with tibialis posterior tendon lesions, additional procedures were performed according to the state of the lesion. Results: All were type II accessory navicular bone which had synchondroses. There was gross motion of the synchondrosis in 'the operating field in all feet. Of the 9 feet which were followed for more than one year after surgery, results were excellent in five and good in four. Conclusion: The painful accessory navicular in adult might be closely associated with inversion ankle sprain, and also with the tibialis posterior tendon lesions. Satisfactory result could be obtained without transposition of the tibialis posterior tendon to the undersurface of the navicular and immediate postoperative weight bearing does not have harmful effect on the result.
이철,이우천,라종득,고한석,남기헌,고강훈 대한골절학회 2001 대한골절학회지 Vol.14 No.4
Purpose: To investigate the indication of transfixation of distal tibiofibular syndesmosis. Materials and Methods: Twenty-two patients were surgically treated for diastasis of the distal tibiofibular syndesmosis and followed for more than one year. The decision to transfix the syndesmosis was made according to the result of intraoperative stress test. Results: In patients with bimalleolar fracture, good or excellent clinical results were obtained in all patients, and no widening of the medial clear space and 1㎜ or no widening of the tibiofibular clear space was observed. In patients with deltoid ligament tear, good or excellent results were obtained in five patients, and the medial clear space was widened more than 1㎜ in three patients and tibiofibular clear space was widened 2㎜ or more in four patients. Conclusion: We be1ieve that transyndesmotic fixation is not required if anatomical bimalleolar fracture fixation is achieved, and in patients who have deltoid ligament rupture, it may be better to transfix the syndesmosis regardless of the level of fibular fracture.