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정연민,송지남,이호석,서재현 대한두개저학회 2015 대한두개저학회지 Vol.10 No.2
It is very uncommon to diagnose the malignant neoplasm of external auditory canal or middle ear cavity. Hearing impairment, chronic suppurative or hemorrhagic otorrhea, otalgia, tinnitus, vertigo, and headache are frequently accompanied symptoms. Occasionally, chronic suppurative or hemorrhagic otorrhea due to malignant lesion supervened with chronic otitis media can cause confusion to diagnosis and treatment of these patients. We report a case of 78 aged female who underwent canal wall down mastoidectomy with impression of chronic otitis media with cholesteatoma but her final pathology was identified to squamous cell carcinoma. As such a case has never been reported yet in Korea, we recommend considerable points for early diagnosis to help treatment.
정연민 한국통신학회 2021 정보와 통신 Vol.38 No.10
본 논문은 미디어 트래픽을 발생시키는 다양한 프로토콜 중 WEB-RTC (Web-Real Time Communication) 기반의 화상 트래픽의 효율적인 전송 매커니즘의 구조에 관한 연구이다. 미디어 단말간 영상 처리 기술을 SFU/MCU/P2P 기술을 효율적으로 연계함으로써 각 서비스에서 발생하는 장점과 단점을 혼용하여 단말 및 서버 간 발생되는 인프라 비용 및 네트워크의 효율적인 관리를 통해 저비용 고가용성의 미디어 환경 구축을 통한 서비스 사업자의 경쟁력 확보를 기대할 수 있게 해준다.
원주방향 급유홈 프로팅링 저널베어링으로 지지된 탄성 회전체의 안정성
정연민,김경웅 대한기계학회 1992 대한기계학회논문집 Vol.16 No.12
The stability of the flexible rotor mounted on circumferentially grooved floating ring journal bearings was investigated theoretically and experimentally. The floating ring journal bearing was analyzed by using JFO reformation boundary condition. The flexible shaft was analyzed by the finite element method based on Rayleigh beam theory. It was found that the measured ring speed agrees well with the theoretical results. The instability of the system due to not only the outer film but also the inner film of the bearing could be predicted by the theory which allows negative vapor pressure. The tendency that reducing the supply pressure of lubricant stabilizes the system was observed both experimentally and theoretically. 본 연구에서는 동 베어링에 대한 해석을 바탕으로 원주방행 급유홈 프로팅링 저널베어링으로 지지된 탄성 회전체의 안정성에 대한 이론을 전개함과 동시에 실험을 통해 동 베어링의 안정성을 조사하고자 한다.
정연민,조성우 한방재활의학과학회 2019 한방재활의학과학회지 Vol.29 No.1
Objectives The purpose of this survey was to investigate the using experiences and attitudes of general public toward the East-West collaborative medical practices (EWCMP). Methods We selected objects in general public and structured questionnaires were administrated to both 295 offline participants and 795 online participants. The data was collected from 15 to 28 February 2016 and analyzed statistically by frequency, χ2 cross-over analysis with SPSS software. Results The total number of participants was 1,090 and 66.1% of them has heard but only 19.5% has ever used EWCMP. For participants who has used EWCMP, the decision to use it was made by themselves (53.2%), 44.0% of them was satisfied with EWCMP, 89.4% of them showed revisiting intention to EWCMP hospital, and 72.2% of them showed the intention to introduce EWCMP to others. And 52.3% of them were optimistic about the prospects of EWCMP, especially in the field of disease treatment (49.9%) and rehabilitation (20.6%). On the reasons for lack of development of EWCMP, 31.9% of them listed prejudices existing on both sides firstly (31.9%). Preferred type of EWCMP was to use both western and Korean medical treatment at the same weight (53.9%). To promote EWCMP, it is required to confirm the concept of collaborative medical practice to the medical professions and government authorities (29.5%). Conclusions Considering low proportion of utilization and positive attitude toward the EWCMP among general populations, it is need to introduce or advertise EWCMP to them. (J Korean Med Rehabil 2019;29(1):41-61)