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윤강섭,Yoon, Kang-Sup 한국전자통신학회 2011 한국전자통신학회 논문지 Vol.6 No.5
실내에서 이동로봇의 절대위치 측정을 위해서 초음파를 이용하는 초음파 위치측정 시스템이 많이 연구되고 있다. 이러한 초음파 위치측정 시스템들은 초음파의 혼신을 피하기 위해 순차 발신하는 방법을 사용하고 있다. 그러나 이러한 순차 발신으로 인해 이동로봇이 이동하는 경우에는 초음파의 수신위치가 변하므로 위치측정 정도가 떨어지게 된다. 본 논문에서는 수신시점에 따른 가중치를 적용하는 새로운 위치추정 알고리즘을 제안하였다. 그리고 제안된 알고리즘을 기존의 초음파위성시스템에 적용하여 개선된 초음파위성시스템을 구축하였다. 그리고 실험을 통하여 제안된 알고리즘을 가진 개선된 초음파위성시스템의 위치측정 성능을 입증하였다. For the measurement of absolute position of mobile robot in indoor environments, the ultrasonic positioning systems using ultrasound have been researched for several years. Most of these ultrasonic positioning systems to avoid interference between the ultrasound are used for sequential transmitting. However, due to the use of sequential transmitting, the positions of transmitter to receive an ultrasound will change when the mobile robot moves. Therefore the accuracy of positioning is reduced. In this paper, the new position estimation algorithm with weighting factor according to the time of receipt is proposed. By applying the proposed algorithm to existing Ultrasonic Satellite System(USAT), the improved USAT is configured. The positioning performance of the improved USAT with the proposed position estimation algorithm are verified by experiments.
고관절 전치환술시 발생되는 지방 색전증에 대한 경식도 심초음파(Transesophageal Echocardiography)를 이용한 연구
윤강섭 ( Kang Sup Yoon ),이지호 ( Ji Ho Lee ),김원중 ( Won Joong Kim ),박진수 ( Jin Soo Park ),조주희 ( Joo Hee Cho ),김철호 ( Cheol Ho Kim ) 대한고관절학회 1996 Hip and Pelvis Vol.8 No.2
Hypotensive episode commonly occurring in the cemented hip arthroplasty is often associated with a circulatory collapse and sudden death of the patient. We performed transesophageal echocardiography on 20 patients subjected to cemented or uncemented hip arthroplasties. Embolic phenomena were detected by transesophageal echocardiography and the echogenic pattern showed an embolic cascade which developed in a relatively scheduled fashion. Age greater than 50 and cemented hip arthroplasty caused greater incidence and prolonged period of embolic phenomenon compared to the group with age less than 50 years and uncemented arthroplasty. Embolic phenomenon most frequently occurred during operative procedures which increase intramedullary pressure. This results imply that a careful assessment of perioperative cardiopulmonary function is a prerequisite to cemented arthroplasty in the patients with age more than 50 years old.
유소년기 감염성 고관절염으로 인한 골관절염의 외전근 활주를 이용한 2단계 고관절 전 치환술
윤강섭 ( Kang Sup Yoon ),강승백 ( Seung Baik Kang ) 대한고관절학회 1998 Hip and Pelvis Vol.10 No.2
Total hip arthroplasty for adults with the sequelae of pediatric hip infection presents a series of difficult problems because of soft tissue contractures, hypoplasia of acetabulum, distorted femur, suboptimal abductor function, leg-length discrepancy and recurrence of infection. During the past 5 years, two stage total hip arthroplasty using abductor slide has been performed for the twenty one patients with the sequelae of pediatric hip infection and followed up for average 29.1 months. No trochanteric osteotomy was done and the aMuctor was released subperiosteally and aUowed to slide distally over the wing of the ilium. The mean Harris hip score and the Enghs radiographic assessment score were 84.4 and 22.7 respectively. One hip, which showed migration of the acetabular cup, rated as poor and the revision of the acetabular cup seemed to be impending. The frequency of the pain was 19.0% and limping was seen in 47.6%. The average correction of leg length discrepancy was 3.3 cm and there was no sciatic and common peroneal nerve palsy except one case of temporary femoral nerve palsy which recovered completely 4 months after operation. Vascular injury, postoperative dislocation, deep infection were not detected in all cases and heterotopic ossification occurred in 1 1 hips(52.4%). Two stage total hip arthroplasty for adults with the sequelae of pediatric hip infection would be a safe technique, having many advantages such as safe, sufficient correction of leg length discrepancy, avoidance of nerve palsy and trochanteric problem, restoration of abductor function, detection of latent bone infection and measurement of true leg length in the presence of severe joint contracture and so on. Gentle tissue handling to avoid heterotopic ossfication and longer follow-up will be needed to uncover any hidden advantages or disadvantages of this technique.
고관절 감염 후유증 환자에서 시행한 3세대 알루미나-알루미나 고관절 전치환술
이혁진(Hyuk-Jin Lee),유정준(Jeong Joon Yoo),구경회(Kyung-Hoi Koo),윤강섭(Kang Sup Yoon),김영민(Young-Min Kim),김희중(Hee Joong Kim) 대한정형외과학회 2008 대한정형외과학회지 Vol.43 No.3
목적: 고관절 감염 후유증 환자는 고관절의 해부학적 변형 정도가 심해 고관절 전치환술을 시행하기 어렵고 이환 연령도 낮은 관계로 치환술 후 합병증 발생률과 실패율이 높다고 알려져 있다. 본 연구에서는 마모와 골 용해 발생이 적다고 알려진 알루미나-알루미나 고관절 전치환술로 치료한 고관절 감염 후유증 환자들의 임상적, 방사선학적 추시 결과를 분석하였다. 대상 및 방법: 고관절 감염 후유증으로 무시멘트성 알루미나 알루미나 고관절 전치환술을 시행 받고 최소 5년 이상 추시(평균 6년 10개월, 5년-8년 7개월)가 가능하였던 48 고관절(48명)을 대상으로 하였다. 수술 당시 평균 연령은 36.7세(18-63세)로 41명이 50세 이하였다. 전례에서 알루미나 관절면(BIOLOX<SUP>®</SUP> forte)을 장착한 PLASMACUP<SUP>®</SUP>SC-BiCONTACT<SUP>®</SUP> system이 사용되었다. Harris 고관절 점수를 이용하여 임상적 평가를 실시하였고 방사선학적 검사로 삽입물의 고정 상태, 골 용해 발생 여부, 수술 전 후 환자의 하지 부동 정도, 수술 전 후 고관절 회전 중심 변화를 평가하였다. 결과: Harris 고관절 점수는 수술 전 평균 61.6점에서 최종 추시 시 92.2점으로 향상되었다. 전예에서 감염의 재발은 없었으며 삽입물의 안정적 고정을 확인하였다. 최종 추시 시 삽입물의 해리는 없었으며 추시 도중 골 용해가 의심되는 경우가 1예에서 관찰되었다. 하지 부동은 술 전 평균 26.2 ㎜에서 술 후 평균 9.5 ㎜로 교정되었다. 고관절 회전 중심은 수술 전과 비교하여 수술 후 평균 11.7 ㎜ 내측으로, 평균 5.2 ㎜ 하방으로 이동하였다. 대전자의 불유합이 2예 있었으나 술 후 감염 및 세라믹의 파손은 없었다. 결론: 알루미나-알루미나 고관절 전치환술로 치료한 고관절 감염 후유증 환자들의 5년 이상 추시 결과는 만족스러웠다. 감염에 의한 고관절의 해부학적 변형이 심한 젊은 환자들에게 알루미나-알루미나 관절면은 유용한 대체 관절면이라 판단된다. Purpose: THA in patients with dysplastic hips secondary to infection of the hip joint is a technically challenging procedure because of long-standing anatomic abnormalities of the bone and soft tissues. Low friction, low wear, alumina-on-alumina bearing surfaces are an attractive alternative to conventional metal-on-polyethylene articulation, and may offer a promising option for young, active patients. Here, we evaluated the results of a modern alumina-on-alumina THA performed in patients with sequelae of the hip joint infection, with a 5-year minimum follow-up. Materials and Methods: We retrospectively analyzed 48 primary cementless alumina-on-alumina THAs that had been performed in patients who had sequelae of the hip joint infection between November 1997 and December 2000. The average age of the patients at the time of the index arthroplasty was 36.7 years (range, 18-63 years) and41 patients were younger than 50 years old. They were followed-up for more than 5 years (average, 82 months range, 60-103 months). Results: All hips had no recurrence of a hip joint infection. The mean Harris hip score improved from 61.6 points preoperatively to 92.2 points at the latest follow-up. All of the implants had radiographic evidence of bone ingrowth and no radiological loosening. During the follow-up period, nocup or stem was revised. Periprosthetic osteolysis was suspected in one hip. Leg length discrepancy was corrected from 26.2 ㎜ preoperatively to 9.5 ㎜ postoperatively. Postoperatively, the hip center migrated 11.7 ㎜ medially and 5.2 ㎜ inferiorly. Nonunion of the osteotomized greater trochanter occurred in two hips, but no postoperative infection or ceramic failure was observed. Conclusion: The 5-year minimum follow-up clinical results of modern alumina-on-alumina THA in patients with sequelae of the hip joint infection were encouraging. Our results show that alumina-on-alumina articulation offers a reliable alternative solution for young patients with technically difficult arthroplasties.