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A Case of Paraffinoma Removal Using Endoscope-Assisted Microdebrider
나윤성,박찬흠,이정우,김명진 대한비과학회 2014 Journal of rhinology Vol.21 No.1
Paraffin has been used illegally in Korea for many years as an oil-soluble substance to augment depressed nasal dorsum. Here we describe the successful management of a case of nasal paraffinoma using an endoscope-assisted microdebrider and primary reconstruction using autologous dermofat and Gore Tex. The patient was placed in the supine position under general anesthesia, and bilateral intercartilaginous incisions were made. The endoscopic views provided an extended image that aided in identifying paraffinoma within the soft tissue. The paraffinoma was removed with a microdebrider. The dorsal defect and irregularities were reconstructed using dermofat and Gore-Tex.At the four-year follow-up, the patient was satisfied with the cosmetic results, and there was no evidence of recurrence.
무리수 개념의 오류 찾기 활동에서 학생 인식과 교사의 발문 전략
나윤성,최송희,김동중 한국수학교육학회 2023 수학교육 Vol.62 No.1
본 연구는 무리수 개념의 수학 오류 찾기 활동에서 학생의 인식뿐 아니라, 오류 활용에 관한 학생의 학습 태도와 수학적 담론 수준의 변화를초래하는 교사의 발문 전략을 살펴보는 데 목적이 있다. 이를 위해 133명의 중학교 학생을 대상으로 오류 찾기 개인별 활동, 모둠 활동과 추가 면담을수행하여, 학생의 인식과 학생의 학습 태도와 수학적 담론 수준의 변화를 위한 교사의 발문 전략을 분석하였다. 연구 결과, 학생들의 인식은 무리수의기호 표상과 소수 표상에 집중하며 수직선 위의 무리수의 존재성은 인식하지만 도형을 활용한 수직선 표현에는 어려움을 겪는 경향이 있었다. 또한학생의 학습 태도와 수학적 담론 수준의 변화를 촉진하기 위해 교사의 유도적-탐구적 발문 전략의 중요성을 관찰할 수 있었다. 본 연구는 수학교수·학습에서 오류의 활용 방법을 구체화하고, 수학 오류 찾기에서 교사의 발문 전략을 정교화하였다는 점에서 가치가 있다.
파지점의 회전 반경을 보상하는 손목 메커니즘의 가동범위 분석
나윤성(Yunseong Na),송재복(Jae-Bok Song),인용석(Yong Seok Ihn) 대한기계학회 2024 大韓機械學會論文集A Vol.48 No.3
Robots generally face several challenges in confined human environments. Owing to the long bending radius of robotic wrists, they require more extensive space than humans, and the end-effector reorientation is constrained by obstacles. To address this problem, we propose a novel 3-DOF wrist mechanism that reduces the space required for reorientation. Through a virtual axis generated by a spatial parallelogram mechanism, it can kinematically reduce the bending radius by 19 mm. Unlike existing wrist joints, the proposed mechanism represents a reversed envelope similar to spatial remote center-of-motion mechanisms, but there is a significant difference in maintaining a compact forearm shape. We analyzed the kinematic characteristics of the wrist and derived an asymmetric range-of-motion generated by the mechanism implementing the virtual center of rotation. The inertial measurement device was used to obtain ranges. We confirmed that the proposed wrist has a compensable range of motion compared to conventional wrist joints.
이중섭,나윤성,이정우,박찬흠 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.5
Maxillary fractures are common traumas in facial lesions, frequently involving the thin bony anterior wall. Minimally invasive operations have been tried in these maxillofacial areas; for example, the Foley balloon inflation technique guided by nasal endoscopy in orbital blow-out fractures have been recently reported with a high success rate. However, in maxillary anterior wall fractures, these minimally invasive surgical procedures have seldom been reported. This report presents the case of a 24-year-old man with an anterior maxillary wall fracture. The fracture was treated with a minimally invasive method that uses an endoscopic approach to the maxillary antrum with a Foley catheter ballooning, which was monitored by real-time ultrasonography. This report presents the imaging studies and a description of the endoscopic procedure. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(5):340-3
협골궁 골절 부정유합 동물 모델에서 치유과정에 대한방사선학적 및 조직학적 연구
김동규,김명진,나윤성,이정우,박찬흠 대한비과학회 2013 Journal of rhinology Vol.20 No.2
Background and Objectives : Zygomatic arch fracture should be treated early, because failure of prompt treatment of these injuries November result in significant morbidity, including malar asymmetry, enopthalmos, and sensory deficits. The purpose of this study was to evaluate the radiologic and histological changes of healing process on zygomatic arch fracture with malunion in animal model. Materials and Method : Ten rats with malunion after zygomatic arch fracture were used in this study. Using micro computerized tomography, we evaluated the defect of fracture site with serial weeks (1, 2, 4, and 8). We also analyzed the histological findings at same period. Results : The 2-D images were able to assess a difference in recovery process of a bone fracture, but it was too small to be recognized. However, we could find to the definite changes of healing process by using the 3-D reconstructed image according to time sequence. Additionally, fracture sites were healed by primary bone healing process in the zygomatic arch fracture malunion state. Conclusion : The 3-D image is more useful to evaluate for fracture healing state. Moreover, the proper evaluation and adequate management is necessary even after eight weeks, because healing of fracture was not completed.
구개수구개인두성형술 후 호전되지 못한 폐쇄성 수면무호흡증 환자에서 약물유도수면내시경을 이용한 결과 분석
김동규,이정우,이준호,이중섭,나윤성,김명진,이민주,박찬흠 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.2
Background and Objectives The purpose of this study is to evaluate drug-induced sleep endoscopy (DISE) findings in patients with persistent obstructive sleep apnea (OSA) after uvulopalatopharyngoplasty (UPPP) surgery. Subjects and Method Patients were included in this study if they had a postoperative DISE evaluation as well as pre- and postoperative polysomnography. DISE findings included the obstructive sites (velum, oropharyngeal lateral walls, tongue base, and epiglottis), and the obstructive patterns of velopharynx (anteroposterior, lateral, and concentric). Results A total of 77 patients were included in this study. Poor-responder patients to UPPP (n=50) and well-responder patients to UPPP (n=27) were similar with regard to age, gender, body mass index, preoperative AHI, and minimal O2 saturation. In our analysis of DISE findings on poor-responder, velopharynx was the most common obstruction site (100%), followed by oropharynx (88%), tongue base (70%), and epiglottis (44%). Results showed that most patients (n=49) had multiple obstructive sites. No significant differences according to position dependency and REM dependency were found in obstructive sites. However, severe OSA patients had tongue base obstruction more frequently than the moderate OSA patients did. The obstructive pattern of velopharynx usually showed concentric configuration (70%, 35 of 50). Conclusion Our results suggest that the preoperative DISE may be a useful method for determination of the personalized surgery to OSA patients because of its more precise information to upper airway obstruction. Korean J Otorhinolaryngol-Head Neck Surg 2014;57:96-102