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가금에서 정맥튜브 및 근막을 이용한 굴곡건초 재건에 관한 실험적 연구
김승홍,윤병일,민대홍,백무현,한형일,고용범,이기룡 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.4
Tendon sheath is an important structure in nutrition, healing and gliding motion of the tendon. To know the effect of tendon sheath restoration with fasica and vein graft after tendon surgery, experimental surgery was done in chickens. Middle toe profundus tendon was severed and repaired. After tendon repair, sheath was treated in three ways. In group A, tendon sheath of 1cm length was simply excised. Then, sheath was excised and restored with femoral rectus muscle fascia in group B and vein conduit graft in group C. After casting in flexion for 14 days, the operated foot and digits were taken through a full passive range of motion every 3 days. At the 30th postoperative day, all immobilization was removed and free active range of motion began. Active flexion was measured after death by continuous traction on the proximal produndus tendon(simulated active flexion). The non-operated contralateral foot served as the control. All operated middle toes achieved significant greater functional return when the sheath was restored either with fascia patch or vein conduit graft in comparison with simple excision of the sheath. The histologic examination showed that area of healing was better organized with less adhesion when the sheath defect was grafted. The results indicated the possibility of utilizing fascia patch or vein conduit during primary tendon repairs as well as the efficacy of sheath closure.
A 30 MeV-cyclotron-based quasi-monoenergetic neutron source
Chu Kuo-Yuan,Kuo Weng-Sheng,Lee How-Ming,Fuh Yiin-Kuen 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
This study developed a quasi-monoenergetic neutron source (QMN) for the semiconductor device's soft error rate test (SER). Quasi-monoenergetic neutrons are generated by 9Beðp; nÞ 9B nuclear reaction with a 1 mm beryllium target and 30 MeV protons from a cyclotron. An 8 mm water in the back of the beryllium target is used for avoiding proton penetration. The neutron spectra simulated by MCNP showed that the peak energy was around 26.5 MeV. The heat flow and mechanical properties are numerically analyzed, and the safe operating conditions are therefore determined.