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조용선,정현교,노종석,중용식,천창율 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
In the current paper, we propose a new modeling algorithm to analyze the coupling between an incident electromagnetic field (EMF) and a twisted conducting line, which is a kind of non-uniform line. Typically, analysis of external field coupling to a uniform transmission line (TL) is implemented by the Baum-Liu-Tesche (BLT) equation so that the induced load responses can be obtained. However, it is difficult to apply this method to the analysis of a twisted conducting line. To overcome this limitation, we used a chain matrix composed of ABCD parameters. The proposed algorithm expands the dimension of the previous chain matrix to consider the EMF coupling effectiveness of each twisted pair, which is then applied to multi-conductor transmission line (MTL)theory. In addition, we included a comparative study that involves the results of each method applied in the conventional BLT equation and new proposed algorithm in the uniform two-wire TL case to verify the proposed method.
경피적 척추성형술을 이용한 Kummell씨의 병의 치료
조용선,조성도,김범수,박태우,류석우,황수연 대한척추외과학회 2001 대한척추외과학회지 Vol.8 No.3
연구계획 : 수술적 치료가 어렵거나 보존적 요법에도 불구하고 만성적인 통증이 있는 Kummell씨 병에 대하여 골시멘트를 이용한 경피적 척추성형술을 시행하였다. 연구목적 : 보존적 요법에 잘 듣지 않는 Kummell씨 병에 대하여 골 시멘트를 이용한 경피적 척추성형술을 시행하여 치료 결과를 알아 보고자 하였다. 대상 및 방법 : 1999년 6월부터 2000년 7월까지 14명의 환자 18 척추체의 Kummell씨 병에 대하여 골시멘트를 이용한 경피적 척추성형술을 시행한 후 1일, 1개월, 3개월, 6개월째에 하였으며 이후 매6개월마다 각각 통증의 호전 정도와 합병증을 조사하였다. 결과 : 모든 환자에서 시술 24시간 이내에 통증이 호전되었으며, 시술 3개월까지의 추시 소견상 우수가 10명(71.5%), 양호 3명(21.4%), 보통 1명(7.1%)이었다. 6개월 째에는 우수가 9명(64.3%), 양호 3명(21.5%), 보통 1명(7.1%), 불량 1명(7.1%)였다. 최종 추시상 우수가 8명(57.2%), 양호 4명(28.6%), 보통 2명(14.2%)이었다. 시술중 5명(35.7%)에서 시멘트가 척추체외의 공간으로 누출되는 합병증이 있었으나 증상을 유발하지는 않았다. 결론 : 골시멘트를 이용한 경피적 척추성형술은 적절한 보존적 치료에 반응하지 않거나 수술적으로 치료하기 어려운 Kummell씨 병에서 즉각적인 통증의 완화를 얻을 수 있는 최소 침습적인 시술로 생각된다. Study Design : Prospective study about fourteen consecutive patients with Kummell's disease who were treated by percutaneous vertebroplasty with bone cement. Objectives : To evaluate the results of percutaneous vertebroplasty using bone cement in the treatment of Kummell' s disease. Summary of literature Review : Kummell's disease is a rarely reported, poorly documented, and poorly understood phenomenon. It is associated with intravertebral vacuum phenomenon and clinically manifested by painful kyphosis. The treatment of the disease had been conservative or surgical reconstruction, but both conservative and operative treatment were not satisfactory in some patients. Materials and Methods : A review was conducted of 14 patients with 18 vertebrae treated with percutaneous vertebroplasty from June 1999 to May 2000. They had posttraumatic vertebral collapse or Kummell's disease and had failed medical therapy. Immediate and long-term pain response and complications of percutaneous vertebroplasty with bone cement were evaluated. Results : All patients reported complete relief of pain within the first 24 hours. Ten(71.5%) were evaluated as excellent; three(21.4%), good; one(7.l%), fair until 3 months postoperatively. Eight(57.2%) were evaluated as excellent; four(28.6%), good; fair(7.1%), one; poor(7.1%), one at final follow-up. Five(35.7%) patients had cement extrusion into the disc, paravertebral vessels and epidural space without significant systemic symptoms. Conclusion : For patients with posttraumatic vertebral collapse or Kummell's disease, percutaneous vertebroplasty technique using bone cement would be a minimally invasive treatment option to achieve immediate relief of pain and stabilization without significant side effects.