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비인식대상 문장 거부 기능을 위한 음소 기반 인식 네트워크의 구성에 관한 연구
이병혁(Byeong-Hyeok Lee),하진영(Jin-Young Ha) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅱ
음성인식 시스템에서 입력된 음성 데이터에 대해 비인식 대상에 대한 거부기능은 신뢰도 보장 측면에서 상당히 중요하다. 비인식 대상의 단어 거부는 지금까지 여러 연구가 이루어져 왔으나, 문장 거부에 대한 연구는 사실상 부족한 실정이다. 본 논문에서는 비인식 대상 문장 거부기능의 신뢰도를 한층 높일 수 있도록, 음소 기반 네트워크에 유성자음(VC), 무성자음(C), 모음(V) 단위의 필러 음향 모델을 생성하여 다양한 음소기반 인식 네트워크의 구성방법을 작용하여 비인식 대상 문장에 대해 거부 기능을 구현하고, 그에 따라 인식률과 거부율이 달라질 수 있음을 보인다. 구현된 시스템에서 제안한 3가지 음소단위 인식 네트워크 중 문장의 각 단어별 필러 모델을 구성했을 때가 가장 좋은 구성임을 알 수 있었다.
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일반철도 유지보수 합리화를 위한 궤도틀림 기준 연구방향
김수정(Soo-Jeong KIM),이병혁(Byeong-Hyeok Lee),이두재(Du-Jas Lee),엄종우(Jong-Woo Eom) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Currently the train operating environment to affect track irregularity is changed rapidly such as speed-up linear improvement and rolling stack upgrade. The recent track maintenance criteria of track irregularity was quoted from past Japan's and the needs of revision of criteria are increased because of the rapid change in train operating environment. In case of enhance the track irregularity criteria it secure driving safety and riding comfort but maintenance cost are increase. And also decrease ballast durability by frequent corrective work. In case of mitigate the criteria it decrease driving safety and riding comfort but save the maintenance cost. The study for enacting rational criteria did not carry out so far. In this study survey the domestic and international track irregularity and case study for track irregularity inspection results and maintenance history for guideline of enacting irregularity criteria study.
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필러 모델과 음소 모델 네트워크를 이용한 비인식 대상 문장 거부
이병혁,하진영 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-
Non-recognition utterance rejection is very important to improve the confidence of speech recognition system. Research efforts have been made for out-of-vocabulary word rejection. However, little attention has been paid to non-recognition sentence rejection. According to the appearance of pronunciation correction systems using speech recognition technology, it is needed to reject non-recognition sentences to provide users with more accurate and robust results. In this paper, we introduce three recognition network structures - phone-level, word-level, and sentence-level filler model network - using phone models and filler models to implement non-recognition sentence rejection system. We present three types of filler models: VC(Voiced Consonant), C(unvoiced Consonant), and V(Vowel) in the recognition network. Several experiments were performed to select the best network structure. We found that the word-level filler model network outperforms both phone-level model network and sentence-level filler model network. In addition, another experiment has been performed to find an optimal garbage ratio threshold according to the number of words in each target sentence. Experimental results show that we can achieve better performance using a length dependent threshold than using a constant threshold in terms of the average of FAR and FRR.
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발효다시마 및 홍국미 함유 식이가 고콜레스테롤혈증 흰쥐의 혈액성분 및 혈청 콜레스테롤, 혈당, GOT, GPT 수준에 미치는 영향
李雄洙,李龍林,李炳赫 충주대학교 산업대학원 2002 大學院論文輯 Vol.3 No.-
This research was carried out to investigate the hypocholesterolemic effects of diets containing sea tangle(Laminaria japonica) fermented and rice cultures by Monascus ruber in Sprague-Dawley male rats. After 2 weeks feeding with basal diet, 6 week old rats were fed with basal diet, diets containing 1% cholesterol, and 5% sea tangle+soybean protein(9:1), 5% sea tangle+soybean protein+rice cultures(8:1:1, 6:1:3, 3:1:6) and 5% rice cultures+soybean protein(9:1) with 1% cholesterol for 2, 4, and 6 weeks. And then we measured the levels of WBC, RBC, hemoglobin and hematocrit in blood, and GOT, GPT, glucose, triglyceride, total-, HDL- and LDL- cholesterol in plasma. The body weights of rats fed with diets that contained more sea tangle were significantly lower than diets that contained more rice cultures, while there was no difference in the levels of WBC, RBC, hemoglobin and hematocrit in each groups. The levels of triglyceride, total- and LDL-cholesterol were decreased remarkable in the diet groups contained more rice cultures compared to the groups that contained more sea tangle, while the increase of HDL-cholesterol levels were more effective in groups that contained more sea tangle than more rice cultures. The levels of blood sugar were decreased in all diets groups, and the decrease of levels were more effective in the rats fed for more long than short period. The activities of GOT and GPT were decreased in all diet groups, but the groups that contained more rice cultures were more effective than more sea tangle.
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