부양형 고속회전 자이로의 질량불균형 모멘트 제어를 위한 비선형 제어기 설계

송형민,이영재,성상경,이상우 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11

부양형 고속회전 자이로는 정전기력을 이용하여 관성 질량체를 물리적 접촉 없이 부양시키고 이후 고속회전 운동을 하는 구조로 되어있다. 이때 관성 질량체의 질량 불균형으로 인해, 고속회전 운동 시와블링 효과가 발생할 수 있다. 이로 인해 부양형 자이로스코프의 수직축 변위신호의 안정성이 떨어질 수 있다. 이를 제어하기 위해 본 논문에서는 부양형 자이로스코프의 수직축 변위 모델과 x, y 축별 모멘트 모델에 대한 운동방정식을 세우고, 비선형 제어기를 구성하여 시뮬레이션을 수행하였다. 제시된 비선형 제어기를 이용해 부양형 자이로스코프의 수직축 변위량이 감소하는 결과를 얻을 수 있었다. A Levitated gyroscope is operated by nonphysical connection and excited by electrostatic force. If proof mass has a unbalancing mass distribution, then the gyroscope rotated with wobbling effect. This wobbling effect cause unstable vertical displacement output. In this paper, I design a motion of equation about gyroscope’s vertical displacement and axial moment. To control gyroscope’s vertical displacement and axial moment, I use a nonlinear controller based on Lyapunov stability theorem.

Silastic Block을 이용한 제 1 형 갑상성형술의 합병증

송형민,최승호,김상윤,남순열 대한이비인후과학회 2006 대한이비인후과학회지 두경부외과학 Vol.49 No.2

Background and Objectives:The type I thyroplasty has become the gold standard against which glottal incompetence caused by unilateral vocal fold palsy may be improved. The primary purpose of this study was to investigate the types and incidence of complications in the type I thyroplasty with sialstic block. Material and Method:Fifty-eight patients undergoing medialization thyroplasty due to unilateral vocal fold palsy between January 1996 and December 2003 were included for this study. Of 58 patients, 23 were women and 35 were men, with an age range of 18 to 88 years (average 47.8±16.4 years). A retrospective study was performed with medical records for surgical complications. Results:The most common complications were incompletely corrected posterior chink in four patients. Other complications include incorrected aspiration in two patients, poor voice quality requiring revision surgery in one patient and endolaryngeal extrusion of implant in one patient. But there were no airway complications acquiring intervention. The overall complication rate was 13.7% but major complication rate was 6.7%. Conclusion: Complications of the type I thyroplasty with silastic block are relatively few. This procedure can be used safely in patients with unilateral vocal cord palsy. Surgeons should be well aware of complications of the type I thyroplasty with silastic block to cope with them. (Korean J Otolaryngol 2006;49:199-203)

등골고정증에서 등골절개술 후 청력결과

송형민,최세준,이광선 대한이비인후과학회 2007 대한이비인후과학회지 두경부외과학 Vol.50 No.1

Background and Objectives:Many studies have demonstrated that stapedotomy is a successful means of improving hearing for stapes fixation. The aim of this study was to analyze the pre and post-operative hearing improvements and causes of unsucc-essful cases after stapedotomy. Subjects and Method:We reviewed the medical records and video recordings of 38 patients (39 ears)having other ossicular anomaly, stapes fixation in chronic midle ear disease and past history of ear surgery, were excluded. Patient ages ranged from 6 to 60 years, with the patients consisting of 15 males, 16 ears and 23 females, 23 ears. Observation ranged from 8 to 50 months and the mean observation time was 15.4± 1.6 months. Hearing improvements at the final examination were designated as successful when air-bone gap was reduced to 20 dB or less. Results:Pre-operative mean bone and air con-duction thresholds were 21.6± 10.8 (mean± SD) dBHL, 53.4± 12.1 dBHL respectively and mean air-bone gap were 31.8± 8.8 dB. After stapedotomy, mean bone and air conduction thresholds were 17.6± 9.0 dBHL, 29.6± 1.9 dBHL respectively and mean air-bone gap were 1.5± 7.1dB at the last audiologic folow-up. Sucesful hearing improvements were achieved in 36 ears (92.3%). Three patients underwent revision surgery. Conclusion:improvement for stapes fixation with unknown etiology. (Korean J Otolaryngol 207 ;50 :14-8)

보통사람들에게 밀려난 「빵이냐 몽둥이냐」의 정권

송형민 세계평화교수협의회 1986 廣場 Vol.158 No.-

두경부에 생긴 과립세포종 9예

송형민,남순열,김상윤,최승호 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.6

Granular cell tumor (GCT) is a rather uncommon neoplasm. Though GCTs are usually small, solitary and benign in most cases,a small number (1-2%) of cases are malignant. They can originate from anywhere in the body but are most frequently found in thehead and neck, particularly in an oral cavity. Histopathologically, GCT is composed of large, round, or polygonal cells with smalldense nuclei. Cytoplasm contains abundant eosinophilic granules. In an immunohistochemical study, granules of GCT are positivefor S-100 protein. Surgical intervention, wide excision with enough margin, is the treatment modality of choice. Inadequateresection of a tumor may result in local recurrence, even with a benign GCT. We have experienced 9 cases of GCT betweenDecember 1997 and June 2003, and report on them with a review of literatures.

비인강암으로 방사선치료 후 발생한 방추형세포육종 1예

송형민,정유삼,장용주,이봉재 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.12

Radiation-induced sarcoma of the head and neck (RISHN) is one of long-term complications of radiotherapy. The rarity of this tumor is reflected in a few cases reported in the English language medical literature. The incidence of RISHN is, however, likely to increase due to progressive aging of the population combined with improved survival of head and neck cancer patients resulting from better treatment regimes. Diagnosis and management of this problem can be extremely challenging. We have experienced a case of spindle cell sarcoma arising in the nasopharynx of a 52-year-old who followed radiotherapy for nasopharyngeal undifferentiated carcinoma. So, we elaborate on it in our report with a review of literatures. To our knowledge, this is the first report about radiation-induced spindle cell sarcoma in Korea.

등골절개술의 재수술 결과

송형민,이광선 대한이비인후과학회 2007 대한이비인후과학회지 두경부외과학 Vol.50 No.4

Background and Objectives:The aim of this study is to analyze the causes of recurrent conductive hearing loss following sta-pedotomy, and then the final hearing results. Subjects and Method:This study was a retrospective chart review of 6 patients who underwent revision stapedotomy for recurent or persistent conductive hearing loss after primary stapedotomy. The intraoperative Results:Obstruction of oval window fenestra-tion was demonstrated in 5 patients (83.3%), short prosthesis in 4 patients (66.7%), incus erosion in two patients (33.3%) and granulation around prosthesis and stapes in one patient. Successful hearing improvements, air-bone gap (ABG) reduced to 20 dB or less, were achieved in 5 ears (83.3%). There were no patients who noted sensorineural hearing loss and other significant com-plications after surgery. :More than 83% of revision stapedotomy cases have had successful closure of their ABG. The most common problem was obstruction of oval window fenestration (83.3%). (Korean J Otolaryngol 2007 ;50 :296-9)

안검성형술

송형민 대한이비인후과학회 부산,울산,경남 지부회 2016 임상이비인후과 Vol.27 No.1

소아 만성 비부비동염의 임상양상과 내시경 수술성적

송형민,박형욱,정유삼,이봉재,장용주,유명상 대한이비인후과학회 2006 대한이비인후과학회지 두경부외과학 Vol.49 No.2

Background and Objectives:Pediatric rhinosinusitis continues to be a challenging problem to otolaryngologists. This study aims to assess the clinical characteristics of chronic rhinosinusitis and the treatment outcomes of endoscopic sinus surgery (ESS) in children. Subjects and Method:Forty eight patients (13 women and 35 men with an age range of 7 to 17 years) were available for analysis by medical records and questionnaire. We classified the patients into three groups:25 cases of chronic rhinosinusitis with nasal polyposis (CRSNP), 11 cases of chronic rhinosinusitis without nasal polyposis (CRS), 12 cases of antrochoanal polyps (ACP). Objective outcome of ESS was evaluated through endoscopic examination and subjective outcome through questionnaire. Postoperative follow-up period ranged between 6 and 26 months. Results:Thirty-nine patients were treated with ESS and nine with ESS with concomitant adenoidectomy. Thirty-nine patients (81.2%) showed good outcomes by endoscopic examination. Also, thirty-eight patients (79.2%) reported high satisfaction by questionnaire. There were no statistical differences in the results through endoscopy and subjective satisfaction through questionnaire among three groups. CRSNP and ACP groups tended to have higher recurrence rate than CRS group. CRSNP group showed higher CT Lund-Mackay scores than ACP group and CRSgroup. Synechia occurred in 4 (8.3%) of 48 patients. Ten patients (20.8%) required endoscopic polypectomy or revision surgery. Conclusion:While pediatric ESS is still in progress and its role continues to be defined, the results of current study suggest that pediatric ESS is a safe and efficacious therapy for management of chronic rhinosinusitis in children. (Korean J Otolaryngol 2006;49:168-73)

공개소프트웨어 기반 다자간 음성 및 영상통화용 미디어처리보드 개발

송형민,권재식,김진환,김동길 한국산업정보학회 2019 한국산업정보학회논문지 Vol.24 No.5

Korean military uses 'Tactical information communication network' to exchange information between units. In this study, we developed a media processing board for multi-party voice and video telephony based on open source software. On the other hand, in order to apply open source software for weapon systems and parts that are mounted on weapon systems, appropriate review is required according to the weapon system software development and management manual of the Defense Acquisition Program Administration (DAPA). In this study, the analysis of the requirement items was performed and the appropriate countermeasures were proposed for the open software applied to the media processing board with respect to ‘the guidelines for the application of weapon systems to open source software’, an appendix to the DAPA's manual.