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결정 트리 모델링에 의한 한국어 문맥 종속 음소 분류 연구
이선정 한국컴퓨터산업학회 2001 컴퓨터産業敎育學會論文誌 Vol.2 No.2
본 논문에서는 한국어 음소가 좌, 우 음소에 따라 발음 방식이 달라질 때 매 음소를 모델링 하는 방법에 관한 연구를 수행한다. 이를 위해 유니트 감소 알고리즘과 결정 트리(Decision Tree)를 사용하는 방법을 사용하여 비교 연구한다. 유니트 감소 알고리즘은 통계적 특성만을 이용한 알고리즘이며 결정 트리 모델링 방식은 한국어 음운정보와 통계적 정보를 이용하여 문맥종속 음소를 분류하는 방식이다. 특히 본 논문에서는 결정 트리를 사용하여 문맥종속 음소를 분류하는 것에 대하여 상세히 기술한다. 마지막으로 결정 트리를 사용하여 분류된 문맥종속 음소의 성능을 실험하였다. In this paper, we show a study on how to model a phoneme of which acoustic feature is changed according to both left-hand and right-hand phonemes. For this purpose, we make a comparative study on two kinds of algorithms; a unit reduction algorithm and decision tree modeling. The unit reduction algorithm uses only statistical information while the decision tree modeling uses statistical information and Korean acoustical information simultaneously. Especially, we focus on how to model context-dependent phonemes based on decision tree modeling. Finally, we show the recognition rate when context-dependent phonemes are obtained by the decision tree modeling.
러시아어 /t′/의 파찰음화 현상에 대한 음향적 특성 연구
이선정,이용권 한국슬라브어학회 2020 슬라브어연구 Vol.25 No.2
This paper aims to examine some acoustic properties of Russian affricated dental plosive /t′/. Russian language has ‘palatalized’ consonants, and they are produced by raising the front of the tongue so as to touch the hard palate. Palatalized labial consonants are different from dental plosives. When dental plosives are palatalized, they are merged with another articulation which is frication. To analyze Russian affricated dental plosive /t′/, recordings were made of 5 native Russian male speakers producing 5 vowels (/a/, /e/, /i/, /o/, /u/) in isolation and in CV syllables. Measurements were made of duration, intensity, CoG, formant vowel transitions, spectrogram and spectral shapes. The results showed that /t′/ is affricated, the place and manner of articulation were similar to affricate /c/ and /č/. However, when succeeded by vowels, /t′/ still had the acoustic characteristics of dental plosive /t/. This study contributes to a better understanding of acoustic characteristics of Russian affricated /t′/.
이선정,홍현숙,이은혜,박정미,이민희 대한영상의학회 2011 대한영상의학회지 Vol.65 No.5
Purpose: To evaluate the CT perfusion parameters for differentiating between a benign and malignant lymphadenopathy in the neck spaces. Materials and Methods: Seventeen patients with cervical lymphadenopathy underwent perfusion CT. Perfusion parameters, including blood flow (BF), blood volume (BV), permeability index (PI), and mean transit time, were calculated at the regions of interest in the enlarged lymph nodes (LNs). The enlarged LNs were diagnosed by fine needle aspiration, surgical excision, and clinical follow-up. The LNs were classified as either reactive hyperplasia (n = 26), metastatic LNs (n = 11), or LNs of lymphoma (n = 14). Results: Significant differences were found for BF, BV, and PI among the three groups (p < 0.05). Reactive hyperplasia had a significantly higher BF than metastatic LN (p < 0.0167). The LNs of lymphoma had a significantly lower BF, BV, and PI than reactive hyperplasia (p < 0.0167). No significant difference was observed between the metastatic LNs of the head and neck cancer and LNs of lymphoma for all perfusion parameters. Conclusion: In patients with head and neck cancer, perfusion CT is not useful for differentiating between metastatic LNs and inflammatory reactive hyperplasia. However, perfusion CT can be useful for differentiating between LNs of lymphoma and reactive hyperplasia.
Treatment of a Recurrent Chest Wall Desmoid Tumor Using a CT-Guided Steroid Injection
이선정,백상현,신화균,박재성,이은혜 대한영상의학회 2012 Korean Journal of Radiology Vol.13 No.3
We report on a 41-year-old woman with a chest wall desmoid tumour who was successfully treated with a computed tomography (CT)-guided steroid injection. She presented with a palpable mass in the right upper chest wall and was treated by surgical excision and postoperative radiation therapy due to recurrence of the mass at the surgical site. At 20 months after the second operation, a recurrent mass was again detected in the anterosuperior portion of the previous surgical site on CT. We performed a CT-guided steroid injection weekly for 4 weeks by applying a mixture of 3 mL of triamcinolone acetonide (40 mg/mL) and 3 mL of 1% Lidocaine, administering 4-6 mL of the mixture, to the lesion. Six months later, CT showed a marked decrease in the size of the mass.