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이낭 침범성 측두골 골절에 동반된 내이기종의 진단과 임상양상
고일주,이효정 대한이비인후과학회 2008 대한이비인후과학회지 두경부외과학 Vol.51 No.12
Pneumolabyrinth, the presence of air in the inner ear is an evidence of a pathological connection between the fluid-filled space of inner ear and the air-filled space of mastoid/middle ear cavity. The aim of this study is to evaluate the clinical characteristics of pneumolabyrinth combined with temporal bone fracture. Subjects and Method:Among 51 patients with temporal bone fracture, those who visited a secondary referral center between January 2005 to March 2008, 6 patients (7 ears, one bilateral case) with pneumolabyrinth were selected for a retrospective review on their medical records and radiologic findings. Results:All six patients were male, and had concomitant otic capsule-violating fracture in the affected side. All pneumolabyrinths were diagnosed in the CT images taken on the date of trauma, and in one case, the pneumolabyrinth disappeared in a follow- up CT which was taken after 5 days. Six affected ears out of 5 patients showed profound sensorineural hearing loss and one patient with down-sloping severe sensorineural hearing loss showed partial recovery of hearing threshold a month later. Vestibular function tests were performed in four cases and vestibular weaknesses were identified in all affected ears. Conclusion:Immediate high-resolution CT might improve the detection rate of pneumolabyrinth combined with temporal bone fracture. Otic capsule- disrupting fracture has been considered to be synonymous with irreversibly severe to profound sensorineural hearing loss, but one case showed partial recovery in this study. Follow-up audiometric tests are needed to check the recovery of hearing threshold. (Korean J Otorhinolaryngol-Head Neck Surg 2008;51:1081-7)
정상인에서 외안근 전정유발근전위의 특성: 경부 전정유발근전위와의 비교 연구
고일주,홍성광,장은석,이효정,김형종 대한이비인후과학회 2009 대한이비인후과학회지 두경부외과학 Vol.52 No.12
Background and Objectives While vestibular evoked myogenic potentials (VEMPs) can be measured from extra-ocular muscle as well as cervical muscle, there are uncertainties about the patterns and discomfort level of ocular vestibular evoked myogenic potentials (oVEMPs). This study is to identify the properties of oVEMPs parameters and degree of subjective discomfort when compared to cervical vestibular evoked myogenic potentials (cVEMPs) in healthy subjects. Subjects and Method Twenty volunteers with normal hearing were enrolled in this study. The oVEMPs were recorded from electrodes placed beneath the eyes using ipsilateral and contralateral acoustic stimulation with 500 Hz short tone bursts with subjects in sitting position and maximal upward gaze. The cVEMPs were measured using 500 Hz short tone bursts with subject in supine position and their head elevated and turned away from the test side. The latency, interlatency and interamplitude of oVEMPs responses were compared to those of cVEMPs. The subjective discomfort levels of oVEMPs and cVEMPs were compared using a questionnaire survey. Results The cVEMPs appeared as positive-negative biphasic responses in all 40 ears whereas oVEMPs were measured in 27 ears (67.5%) with ipsilateral stimulation and 20 ears (85%) with contralateral stimulation which appeared as negative-positive biphasic responses. The oVEMPs had smaller amplitude than the cVEMPs. The oVEMPs thresholds tended to have higher level than the cVEMPs thresholds. The 18 subjects (90%) reported that the discomfort level of oVEMPs measurement was lower or equal to that of cVEMPs measurement. Conclusion oVEMPs test may be used as a complementary and comfortable diagnostic tool for evaluating the integrity of vestibular-ocular system.
고일주(Il-Ju Ko),구광효(Kwang-Hyo Koo),성보경(Bo-Kyung Sung),김정수(Bung-Soo Kim) 한국컴퓨터정보학회 2008 한국컴퓨터정보학회 학술발표논문집 Vol.16 No.1
객관화된 메타정보를 이용하는 검색방법 과는 다르게 내용기반 검색에서는 전처리된 데이터가 동일하지 않을 수 있다는 문제점이 있다. 특히 디지털 음악데이터의 경우 인코딩과정을 거칠 때 마다 미세하지만 파형의 변화가 생긴다. 이러한 변형은 타임코드를 쉬프트 시켜 동일한 데이터 검색에 어려움을 발생시킨다. 본 논문에서는 이러한 문제를 해결하고자 음악의 시작점을 검출 할 수 있는 방법을 제안하였다. 사람이 소리를 인지하는 원리는 공기가 진동하여 청각기관을 자극하기 때문이며 공기의 진동은 파동을 형성한다. 파동을 구성하는 최소파형모형의 존재 여부를 검사하여 음악의 시작점을 검출 하였다. 녹음환경 및 디지털 압축 과정으로 음을 구성하는 파형에 노이즈가 포함될 경우 음악의 시작점 검출에 방해 요인이 된다. 노이즈의 영향을 받지 않고 음악의 시작점을 검출하기 위해 노이즈가 포함된 파형의 특징을 분류하고, 이 분류를 예외 조건을 두어 해결하였다. 제안한 방법의 성능을 측정하기 위해 600개의 음원을 실험 하였으며 86%의 일치율을 보였다.
고일주,최형일 崇實大學校 生産技術硏究所 1994 論文集 Vol.24 No.-
The role of character recognition is becoming essential, as the amount of document information to be processed is increasing. In the past, the major target of research in character recognition was alphanumeric characters, but recent research is challenging a system that can recognize the Korean and the Chineese Characters as well as the alpanumerics. However, the problem of recognizing oriental characters is much more difficult than that of western characters, since oriental languages have much larger character sets compared to western languages. In order to solve such a problem, a very special care has to be paid in extracting features, since features are main key to recognize characters. That is, it is essential to extract features whose discriminating power is very high. This paper proposed a feature extraction method that uses the contour information of a character. The contour information has known to be very useful in recognizing alphanumeric characters. However, extracting the contour information of oriental characters is not a simple problem, since a oriental character may be splited into several connected components. To solve such a problem, this paper first extracts a minimum enclosing polygon of a character by combining the results of four directional projections. It next applies a background thinning approach to the extracted polygon, and finally it obtains the contour information based on the thinning results.