전기 수직이착륙 항공모빌리티용 동력플랫폼 개발을 위한 이착륙 실험시스템 연구

원준성,노광현 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.4

In modern society, UAM (Urban Air Mobility) transportation system is being developed as an alternative to urban traffic congestion and environmental problems, and electric vertical take-off and landing (eVTOL) is a combination of vertical take-off and landing function and electric power. It is attracting attention as an innovative next-generation transportation method as an eco-friendly alternative that reduces noise and air pollution by providing efficient mobility within the city. Since eVTOL development requires designing and implementing airframes suitable for various mission purposes, the power system needs to be developed as a platform concept before airframe development. In this study, we empirically proposed a test bench concept equipped with a stable power supply and an efficient control system, essential in developing a power platform with a combined function in the form of a fuselage and module type specialized for various mission purposes. The proposed drivetrain platform test bench consists of a system verifying the stable take-off and landing software and a power platform adjusting the motor's thrust. It will serve as a verification system that can be developed.

자기공명영상을 이용한 회전근 개 질환의 경과 관찰

원준성,이우승,박재홍,고승남,서인욱 대한정형외과학회 2018 대한정형외과학회지 Vol.53 No.1

Purpose: Rotator cuff disease (RCD) is a common cause of shoulder pain. However little is known about the progression of RCD during conservative management. This study aimed to identify the progression of RCD using magnetic resonance imaging (MRI). Materials and Methods: This study was conducted between 2013 and 2015; 48 patients who underwent MRI after at least one year of conservative treatment for RCD were enrolled for follow-up analysis. Rotator cuff tear (RCT) and retraction were measured using an MRI. Tear progression was defined as an increase of 3 mm or more in tear size or retraction. Patients were divided into two groups: Small tear group and medium/large tear group. The progression of tears was analyzed. Results: RCT occurred in 25 cases and tendinosis occurred in 23 cases. The progression was observed in 12 cases (48.0%), and new tears were observed in 2 cases (8.7%). The pre-treatment tear size and retraction were 17.8 mm and 18.9 mm, respectively; while the post treatment tear size and amount of tendon retraction were 20.2 mm and 22.3 mm, respectively. The pre-treatment anteroposterior diameter of tears showed a positive correlation with the pre-treatment tendon retraction (r=0.830, p<0.001) but a negative correlation with the anteroposterior tear size progression (r=-0.473, p=0.017). Small size tears were found in 5 cases (20.0%) and medium/large size tears were found in 20 cases (80.0%). Among the 5 cases of small size tears, 4 cases (80.0%) showed progression, with a mean anteroposterior diameter of 7.4 mm and a mean amount of retraction of 5.9 mm. Among the 20 cases with medium/large size tears, 8 cases (40.0%) showed progression, with a mean anteroposterior diameter of 4.1 mm and a mean retraction of 6.8 mm. The frequency of tear progression was significantly different between the two groups (p<0.001). Conclusion: The need to use MRI monitoring during the conservative treatment of rotator cuff tears to evaluate the possibility of switching to surgical treatment. This study also suggests that an aggressive surgical treatment should be considered even for small tears, since the size of tear and retraction of tears may progress similarly regardless of the size of tear. 목적: 회전근 개 질환은 견관절 통증의 흔한 원인이다. 그러나 보존적 치료 시 파열의 진행이나 파열의 발생에 대해서는 잘 알려져있지 않아 자기공명영상을 이용하여 회전근 개 질환의 진행 정도를 알아보고자 하였다. 대상 및 방법: 2013년부터 2015년까지 회전근 개 질환으로 최소 1년 이상 보존적 치료를 시행 후 자기공명영상을 촬영한 48예를 대상으로 하였다. 나이는 평균 64.3세(범위, 45-83세), 추시 기간은 평균 17.6개월(범위, 12-37개월)이었다. 자기공명영상에서 파열의전후 크기와 대결절부터 건의 퇴축을 측정하였다. 파열의 크기나 건의 퇴축이 3 mm 이상 증가 시 파열의 진행으로 정의하였다. 10 mm 미만의 소 파열과 10 mm의 중·대 파열 두 군으로 나누어 파열의 진행을 분석하였다. 결과: 치료 전 자기공명영상에서 회전근 개 파열은 25예였으며, 회전근 개 부분 파열은 23예였다. 파열의 진행은 12예(48.0%), 회전근 개 부분 파열에서 새로운 파열이 2예(8.7%) 관찰되었다. 파열 크기는 치료 전 전후 직경 17.8 mm, 건의 퇴축 18.9 mm였으며, 치료 후 각각 20.2 mm, 22.3 mm였다. 치료 전 파열의 전후 크기는 수술 전 퇴축과 양의 상관관계(r=0.830, p<0.001), 전후 크기의진행과 음의 상관관계(r=-0.473,p=0.017)를 보였다. 소 파열은 5예(20.0%)였고 중·대 파열은 20예(80.0%)였다. 소 파열군 5예중 4예(80.0%)에서 진행하였고 전후 크기는 평균 7.4 mm (범위, 4.1-11.7 mm), 퇴축은 5.9 mm (범위, 4.7-7.7 mm) 진행하였다. 중·대 파열군 20예 중 8예(40.0%)에서 파열이 진행하였으며 전후 크기는 평균 4.1 mm (범위, 0.16-.3 mm), 퇴축은 6.8 mm (범위 , 3.4-14.8 mm) 진행하였다. 소 파열군과 중·대 파열군에서 파열 진행의 빈도는 통계적으로 유의한 차이를 였보다(p<0.001). 결론: 회전근 개 파열의 보존적 치료 시 자기공명영상을 통한 추시 관찰을 통해 수술적 치료로의 전환을 고려해야 할 것으로 생각되며 소 파열군에서도 중·대 파열과 같이 파열의 크기와 퇴축이 진행하므로 소 파열의 경우에도 적극적인 수술적 치료를 고려해야 한다.

회전근개 파열과 상완골두 크기의 연관성

원준성(Jun-Sung Won) 대한견주관절의학회 2017 대한견주관절학회 학술대회논문집 Vol.2017 No.3

변형된 경피적 술식을 이용한 아킬레스 건 봉합술의 임상적 결과

백종륜,곽지훈,원준성,박홍기,Baek, Jong-Ryoon,Kwak, Ji-Hoon,Won, Jun-Sung,Park, Hong-Gi 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.3

Purpose: To investigate the results of percutaneous repair technique of Achilles tendon ruptures, and to describe the surgical technique. Materials and Methods: We retrospectively analyzed the outcomes of 73 patients with ruptured Achilles tendon from October 1995 to September 2009. 28 patients were excluded due to short follow up period. 34 patients were male and 11 patients were female. The mean patient age was 37.19 (10~62) years. The location of rupture site was 6.58 cm proximal to the tendon insertion into the calcaneus on average. Mean follow up period was 55 months and All patients were surgically repaired using percutaneous technique with sural nerve isolation. Results: Arner-lindholm score were excellent in 32 (71%), good in 12 (27%), poor in 1 (2%) case. 44 cases (98%) had the score more than good. Mean American Orthopedic Foot and Ankle Society (AOFAS) Ankle-Hindfoot function score was 92.93 (67~100). We had 1 case of superficial infection, 1 case of soft tissue irritation by suture knot. Conclusion: Percutaneous repair with sural nerve isolation in treating ruptured Achilles tendon showed low complication rate and reliable clinical outcome.

Outcome of Surgical Treatment of AO Type C Pelvic Ring Injury

문도현,김남기,원준성,최장석,김동현 대한고관절학회 2014 Hip and Pelvis Vol.26 No.4

Purpose: To evaluate the radiologic and clinical outcomes of AO type C pelvic ring injury and identify the prognostic factors. Materials and Methods: We studied 53 patients who were treated for AO type C pelvic ring injury from January 2002 to February 2010. Mean age and mean follow-up duration were 42.4 years and 14 months, respectively. We had 8 cases of AO type C1-1, 19 cases of C1-2, 11 cases of C1-3, 6 cases of C2 and 9 cases of C3 injury. We analyzed type of fracture, displacement, method of fixation and associated injuries. Radiologicoutcome was evaluated with Matta and Saucedo criteria and clinical outcome was evaluated using Majeed score. Results: The average Majeed score was 86.2 distributing as 36 excellent cases, 15 good cases and 2 fair cases. Using radiologic Matta and Saucedo criteria, patients were divided as 31 excellent cases, 17 good cases and 5 fair cases. There was no significant difference between the outcomes of anterior, posterior and antero-posteriorfixation. Neurologic injury was the reason for an unsatisfactory functional outcome. We identified two cases with complication, one with postoperative infection and the other with nonunion following anterior-posterior fixation. Conclusion: Satisfactory radiologic and clinical outcomes were obtained with open reduction and internal fixation in the management of AO type C pelvic ring injuries. Neurologic injuries affected the clinical outcome.

Study of the Transverse Foramen in the Subaxial Cervical Spine in Korean Patients With Degenerative Changes: An Anatomical Note

Hridayesh Pratap Malla,김승범,원준성,최만규 대한척추신경외과학회 2018 Neurospine Vol.15 No.2

Objective: The purpose of this study was to provide anatomical data on the dimensions and location of the subaxial transverse foramen (TF) in relation to surgical landmarks routinely used during anterior cervical procedures. Methods: A total of 116 patients who underwent preoperative computed tomography (CT) evaluations for degenerative cervical disease were enrolled. Axial and coronal CT images of the cervical vertebrae from C3 to C6 were analyzed to measure interforaminal distance, the TF distance from the anterior and posterior vertebral body margin, TF dimensions, and the TF medial margin from the tip and medial margin of the uncus. Comparative and correlative analyses were also performed according to age, body mass index (BMI), and sex. Results: All measurement values in male patients were larger than those in their female counterparts. The interforaminal distance gradually increased from C3 to C6. The distance of the TF medial margin from the tip of the uncus was found be above approximately 3 mm in all vertebrae except C6. Correlation analysis revealed that age had a significant negative relationship with the transverse diameter of TF. In contrast, BMI had a significant positive correlation with interforaminal distance. Moreover, the distances of the TF medial margin from the tip and medial margin of the uncus showed strong negative correlations with age. Conclusion: Useful morphometric data were obtained that may help the operating surgeon to avoid vertebral artery injury. The safe distance from the tip of the uncus to the TF medial margin was found to be approximately 3 mm, and this distance should not be violated during lateral decompression. In addition, this value may decrease with age.

퇴축된 회전근 개 파열에서 부착부 내측화를 동반한 일열 봉합의 결과

김영규(Young-Kyu Kim),원준성(Jun-Sung Wom) 대한견주관절의학회 2016 대한견주관절학회 학술대회논문집 Vol.2016 No.7

Glenoid parameters of scapular notching in reverse total shoulder arthroplasty

Young-Kyu Kim,Jun-Sung Won(원준성),Kyu-Hak Jung,Chang-Kyu Park,Seung-Hyun Cho 대한견주관절의학회 2015 대한견주관절학회 학술대회논문집 Vol.2015 No.4