전방 불안정성과 동반된 슬관절 내측 구획 진행성 관절염환자에서 전방십자인대 재건술 및 인공 관절 부분 치환술의 결과 - 3예 보고 -

이철형,송인수,지종훈,김태인,Lee, Chul Hyung,Song, In Soo,Ji, Jong Hun,Kim, Tae In 대한관절경학회 2013 대한관절경학회지 Vol.17 No.1

비교적 젊은 연령의 환자에서 슬관절 내측 구획의 퇴행성 관절염(Kellegrene-Laurence 제 3단계 및 Outerbridge 제 4단계)과 전방십자인대의 파열이 동반되어 전방 불안정성이 있는 3예에서 2예는 전방십자인대 재건술의 6개월 이후 단계적으로 인공 관절 부분 치환술을 시행하고 나머지 1예는 동시에 전방십자인대 재건술 및 부분 치환술을 시행하였으며 수술 전, 후의 International Knee Documentation Committee (IKDC), Lysholm 점수와 최종 추시 상 Hospital for special surgery (HSS)와 knee society score (KSS) 점수를 측정하였다. 저자들의 슬관절의 전방 불안정성과 동반된 내측 구획의 진행성 관절염에서 전방십자인대 재건술과 함께 동시에 또는 단계적으로 시행한 내측 구획 인공 관절 부분 치환술은 슬관절 불안정성과 진행성 관절염에 의한 통증을 동시에 또한 만족스럽게 해결할 수 있는 좋은 선택이라고 사료된다. Three cases who had medial compartment osteoarthritis of the knee (Kellgrene-Laurence grade 3 and Outerbridge grade 4) and anterior instability of the knee due to rupture of the anterior cruciate ligament in relative young ages underwent staged anterior cruciate ligament reconstruction followed by medial unicondylar arthroplasty in 2 cases and simultaneous anterior cruciate ligament reconstruction and unicondylar arthroplasty. We evaluated clinical results some kinds of preoperative and postoperative International Knee Documentation Committee (IKDC), Lysholm score and last follow-up hospital for special surgery (HSS), knee society score (KSS). We consider that medial unicondylar arthroplasty with staged or simultaneous anterior cruciate ligament reconstruction is very good option of the treatment for the anterior instability and pain from advanced arthritis.

카프란수차모헝의 수력학적 성능특성 분석

이철형(Lee, Chul-Hyung),박완순(Park, Wan-Soon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06

The Kaplan turbine model has been tested and analyzed. The blade angle and the guide vane opening of the turbine model were designed to be varied according to the best combination of guide vane and runner blade opening. When the changes in head and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed model in this study will be suitable for small hydropower stations with large changes In head and load such as agricultural reservoir.

송풍기의 고효율에너지기자재 인증 방안

이철형(Chul-Hyung Lee) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-

프란시스수차의 수력학적 성능특성 분석

이철형(Lee, Chul-Hyung),박완순(Park, Wan-Soon) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06

The Francis type hydro turbine with vertical axis has been designed and analized for hydraulic performance verification. The guide vane angle of turbine casing were designed to be varied according to the condition of head and flowrate. When the changes in flowrate and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed hydro turbine in this study will be suitable for small hydro power stations with medium and high head such as agricultural reservoirs and large dam.

불안정성 원위 요골 골절의 치료에 있어 한국형 이중 연골하 지지고정 전방 금속판의 임상적 및 방사선학적 결과

이철형(Chul-Hyung Lee),정덕희(Deukhee Jung),안충한(Chung-Han An),정의탁(Uitak Jeong) 대한정형외과학회 2020 대한정형외과학회지 Vol.55 No.6

목적: 본 연구는 요골 원위부 골절에 대해 국내에서 이중 연골하 지지고정 개념으로 개발된 전방 잠김 금속판의 수술 후 정복 유지효과 및 이에 영향을 줄 수 있는 요인들에 대해 평가해 보고자 하였다. 대상 및 방법: 2017년 7월부터 2018년 12월까지 요골 원위부 골절 환자 중 관혈적 정복 및 금속판 고정술을 시행한 54예를 대상으로 하였다. 수술 직후와 최종 추시 시 촬영한 단순방사선 사진을 이용해 요골 길이, 요골경사, 수장측 경사, 척골 변위, 원위 배측 피질 거리(distal dorsal cortical distance)를 측정하여 골절 정복 유지 효과에 대해 평가하였다. 환자 나이, 골절 분류, 금속판 위치를 기준으로 전체 환자군을 세부 그룹으로 나누어 비교함으로써 각 요인이 골절 정복 유지에 미치는 영향을 분석하였다. 결과: 수술 직후 원위 배측 피질 거리는 평균 5.91 mm (표준 편차, ±1.95 mm)로 측정되었으며 요골 길이(p=0.038), 척골 변위(p=0.001)는 수술 직후와 최종 추시 시 촬영한 단순 방사선 사진에서 유의한 차이가 확인되었다. 전체 환자군을 각 요인에 따라 세부 그룹으로 나누어 평가했을 시 척골 변위는 나이가 65세 이상이거나 AO/OTA 분류 C3형에 해당하는 경우 혹은 금속판 위치가 Soong classification grade 0에 해당하는 경우 수술 직후에 비해 최종 추시 시 유의하게 증가하였다(p=0.007, p=0.012, =p0.046). 결론: 국내에서 이중 연골하 지지고정 개념으로 생산된 전방 잠김 금속판을 이용하여 요골 원위부 골절 정복술을 시행하는 경우 충분한 정복을 확보할 수 있으며 골절 정복 유지에 대해 전반적으로 긍정적인 결과를 보이나, 환자가 고령인 경우, 관절 내 골절의 분쇄 정도가 심한 경우, 금속판이 분수령선의 근위부에 위치한 경우에 척골 변위의 증가를 보여 요골 월상골와의 정복 유지를 위한 고려가 필요하다. Purpose: The aim of this study was to assess the effectiveness of domestically developed volar locking plate which has the concept of double-tiered subchondral support (DSS) in maintaining the reduction after distal radial fracture surgery. Materials and Methods: From July 2017 to December 2018, 54 patients were assessed. Plain radiographs were obtained immediately after surgery and at the last follow-up, and the radiographic parameters were measured in those images: radial length, radial inclination, volar tilt, ulnar variance, and distal dorsal cortical distance. The patients were subdivided into their age, type of fracture, and the position of the plate to evaluate the influence of each factors on the reduction maintenance. Results: Distal dorsal cortical distance in radiographs after the surgery was 5.91 mm (standard deviation, ±1.95 mm) on average. Significant differences in the radial length (p=0.038) and ulnar variance (p=0.001) were observed between immediately after surgery and at the last follow-up. When the parameters were evaluated by dividing the patients into subgroups according to the three specific factors, the ulnar variance showed a significant increase at the last follow-up when the patients were included 65-years-old or older. AO/OTA type C3 fracture, and Soong classification grade 0 plate position (p=0.007, p=0.012, p=0.046, respectively). Conclusion: Using the domestically developed DSS-type volar locking plate, significant reduction after distal radial fracture surgery could be maintained successfully. On the other hand, further study will be needed to determine about the reduction loss of the lunate facet identified in special cases that deal with fractures in elderly patients, unstable AO/OTA type C3 distal radial fractures, and Soong classification grade 0 plate position.

하수처리수를 이용한 소수력발전소 설계 및 성능예측

이철형(Lee, Chul-Hyung),박완순(Park, Wan-Soon),김원경(Kim, Won-Kyoung),김정연(Kim, Jeong-Yeon),채규정(Chae, Kyu-Jung) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.2

A methodology to predict the output performance of small hydro power plant using treated effluent in waste water treatment plant has been studied. Existing waste water treatment plant located in Kyunggi-Do were selected and the output performance characteristics for these plants were analyzed. Based on the models developed in this study, the hydrologic performance characteristics for SHP sites have been analyzed. The results show that the flow duration characteristics of small hydropower plant for waste water treatment plant have quite differences compared with small hydropower plant for the river. As a result, it was found that the developed model in this study can be used to analyze the output characteristics for small hydro power in waste water treatment plant. Additionally, primary design specifications such as design flowrate, capacity, operational rate and annual electricity production were estimated and discussed. It was found that the models developed in this study can be used to decide the design performance of small hydropower plant for waste water treatment plant effectively.

저낙차 수자원 활용을 위한 카프란수차 연구

이철형(Lee Chul Hyung),박완순(Park Wan Soon) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

하수처리장의 소수력발전소 적용

이철형(Lee, Chul-Hyung),박완순(Park, Wan-Soon) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.4

A methodology to predict the output performance of small hydro power plant using treated effluent in waste water treatment plant has been studied. Existing waste water treatment plant located in Kyunggi-Do were selected and the output performance characteristics for these plants were analyzed. .Based on the models developed in this study, the hydrologic performance characteristics for SHP sites have been analyzed. The results show that the flow duration characteristics of small hydropower plant for waste water treatment plant have quite differences compared with small hydropower plant for the river. As a result, it was found that the developed model in this study can be used to analyze the output characteristics for small hydro power in waste water treatment plant. Additionally, primary design specifications such as design flowrate, capacity, operational rate and annual electricity production were estimated and discussed. It was found that the models developed in this study can be used to decide the design performance of small hydropower plant for waste water treatment plant effectively.

입축 프로펠러수차 모형의 수력학적 성능특성

이철형(Lee Chul-Hyung),박완순(Park Wan-Soon) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-

The propeller type hydro turbine model with vertical axis has been tested and analized. The blade angle of runner of turbine model were designed to be varied according to the condition of head and flowrate. When the changes in head and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed model in this study will be suitable for small hydro power stations with large changes in head and load such as sewage treatment plants and agricultural reservoirs.

상지 골절에서 생분해성 마그네슘 합금 나사못 및 K-강선을 이용한 치료 결과

이철형(Chul-Hyung Lee),선두훈(Doohoon Sun),권준한(Junhan Kwon) 대한정형외과학회 2022 대한정형외과학회지 Vol.57 No.2

목적: 골절 치료는 금속성 내고정물과 고정 기술의 발달로 견고한 고정과 조기 운동 치료를 가능하게 해 뛰어난 안전성을 보여왔다. 하지만 임플란트 제거를 위한 이차적 수술, 내고정된 금속물로 인한 불편감등의 단점은 여전히 남아있다. 최근 비교적 강도가 높고 분해율이 낮으며 체내 구성물질만을 이용하여 제작한 마그네슘 합금이 나사못 및 K-강선 형태로 개발되어 정형외과 수술에 사용될 수 있게 되었다. 이번 연구의 목적은 생분해성 마그네슘 합금 나사못과 K-강선을 상지 골절 수술에 적용하고 그 결과를 알아보는 것이다. 대상 및 방법: 2019년 5월부터 2019년 9월까지 본원 정형외과에서 상지 골절로 나사못 및 K-강선을 이용한 내고정이 필요한 환자 중 생분해성 마그네슘 합금 재료의 사용에 동의한 44명, 46예(쇄골 11, 상완골 4, 주구 2, 요골두 4, 갈고리 돌기 3, 요골 4, 척골 1, 지골 8, 중수골 8, 유구골 1)를 대상으로 하였다. 본 연구는 U&I Corporation에 의뢰를 받아 전향적 연구를 실시하였다. 수술 후 골유합과 The Disabilities of the Arm, Shoulder and Hand (DASH) score, 수소 가스 발생, 합병증 발생을 평가하였다. 분쇄 골절에서 기존의 금속판과 나사못으로 고정 후 작은 골편에 추가적인 고정을 위해 사용한 경우가 22예였다. 단독으로 골절 고정을 위해 사용 된 경우는 24예였다. 수술 방법은 생분해성 마그네슘 K-강선을 골수강 내 고정한 경우가 10예로 가장 많았다. 결과: 전 예에서 술 후 평균 16주(4–28)에 골유합을 얻었으며, 마지막 추시에 시행한 DASH score는 평균 45.0 (30–116)이었다. 수술 후 수소 가스 처음 발견 시점은 평균 2주 6일 이었으며 평균 12주에 최대를 보였다. 약물과의 이상 상호작용, 수소 가스에 의한 종창 및 통증, 감염, 골용해, 건 파열 등은 전 예에서 관찰되지 않았으며 정복 소실이 2예, 임플란트 파단 1예, 두드러기가 2예에서 발견되었다. 결론: 상지 골절에서 생분해성 마그네슘 나사못 및 K-강선을 적용할 수 있으나 사용에 주의를 요한다. Purpose: The treatment of fractures has shown excellent safety enabling solid fixation and early exercise treatment with the development of internal metal fixtures and fixation techniques. On the other hand, complications remain, such as secondary surgery for implant removal and, discomfort caused by internally fixed metal materials. Recently, a bioabsorbable magnesium implant with relatively high strength and low decomposition, manufactured using only body components, was developed in the form of screws and K-wire for use in orthopedic surgery. This study aimed to apply bioabsorbable magnesium screws and K-wires to upper extremity fracture surgery and investigate the results. Materials and Methods: From May 2019 to September 2019, 46 cases (clavicle 11, humerus 4, olecranon 2, radial head 4, coronoid process 3, radius 4, ulna 1, phalanx 8, metacarpals 8, and hamate 1) in 44 patients who agreed to use a bioabsorbable magnesium implant among patients requiring internal fixation using screws and K-wires for upper extremity fractures at the author’s orthopedic surgery department were enrolled. The U&I Corporation commissioned this study, and a prospective study was conducted. The radiological findings and The Disabilities of the Arm, Shoulder, and Hand (DASH) score, hydrogen gas generation, and complications were evaluated. In comminuted fractures, the magnesium screws and K-wires were used for additional interfragmentary fixation with a conventional metal plate and screws in 22 cases. There were 24 cases of exclusive usage. The most common surgical method was intramedullary fixation of bioabsorbable magnesium K-wires in 10 cases. Results: In all cases, bone union was achieved on average 16 weeks (4–28 weeks) after surgery, and the mean DASH score at the last follow-up was 45.0 (30–116). A hydrogen gas cavity produced around the absorbable magnesium implant was observed at an average of two weeks and six days, and the largest was noted at an average of 12 weeks. There were no interactive reactions with drugs, infection, osteolysis, tendon rupture and swelling with hydrogen gas. There were two cases of the loss of reduction, one case of implant breakage, two cases of urticaria. Conclusion: Bioabsorbable magnesium screws and K-wires can be applied for upper extremity fractures, but caution is required.