• Title/Summary/Keyword: 이열

Search Result 103, Processing Time 0.026 seconds

이열 기계 배치 문제에서의 개체 선택 방법의 비교

  • 김정집;장병탁;김영택
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 1998.10c
    • /
    • pp.66-68
    • /
    • 1998

  • 이열 기계 배치 문제는 기계의 수가 많아지면 기존의 알고리즘으로는 실제적으로 해결이 불가능한 조합 최적화 문제이다. 본 논문에서는 최적의 기계 배치를 찾기 위하여 유전자 알고리즘을 사용하고 기존의 방법과 비교하여 선택 과정의 개선을 통해 최적화의 성능을 향상시키는 방법에 대하여 고찰한다. 실험을 통하여 제안된 방법의 성능을 분석하였다.

  • PDF

The Results of Arthroscopic Double-Row Rotator Cuff Repairs with Combined Knot-tying and Knotless Suture Anchors (매듭 결속과 비매듭 봉합나사를 이용한 관절경적 이열 회전근개 봉합술의 결과)

  • Ku, Jung-Hoei;Lee, Choon-Key;Cho, Hyung-Lae;Choi, Seung-Hyun
    • Journal of the Korean Arthroscopy Society
    • /
    • v.12 no.3
    • /
    • pp.172-179
    • /
    • 2008

  • Purpose: To evaluate the functional and structural results of arthroscopic double-row repair using combined knot-tying and knotless suture anchors in rotator cuff tears. Materials and Methods: From March 2006 to June 2007, twenty-one patients (15 males, 6 females; mean age 55.6 years; range 48 to 67) were included who underwent arthroscopic double-row repair for full-thickness tears of the rotator cuff following conservative treatment for a mean of 6.5 months (range 3 to 11). The tear size was carefully inspected arthroscopically and we found 2 small, 13 medium and 6 large-sized rotator cuff tears, with a mean tear size of 2.5cm(range 1.8 to 3.2). The repair constructs were consisted of horizontal mattress sutures using conventional knot-tying suture anchors medially and simple suture at the same level of medial row stitch with Bioknotless RC anchors (DePuy Mitek, Norwood, MA) as lateral row. Clinical and functional evaluations were made according to the range of motion, the ASES, UCLA scale and the isokinetic strength testing. Postoperative cuff integrity was determined through magnetic resonance imaging. The mean follow-up was 15 months (range 13 to 24). Results: The average clinical outcome scores and strength were all improved significantly at the time of the final follow-up (p < 0.01). Nineteen patients (90%) were satisfied with the result of the treatment. In 17 of 21 patients (81%) were judged to reveal healed tendon on magnetic resonance imaging at a mean of 7 months postoperatively. There were no significant functional differences according to the preoperative tear size (p<0.01), but large-sized tear shows less favorable structural results in 3 out of 6 cases(50%). Conclusion: Our results document the usefulness and variability of arthroscopic double-row rotator cuff repairs comparable to the results of the other types of double-row repairs.

  • PDF