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자연어 음성인식 기술을 이용한 음성 대화 서비스 개발동향
정호영,송화전,강병옥,정의석,정훈,오유리,권오욱,이기영,이윤근,Jung, H.Y.,Song, H.J.,Kang, B.O.,Chung, E.S.,Chung, H.,Oh, Y.R.,Kwon, O.W.,Lee, K.Y.,Lee, Y.K. 한국전자통신연구원 2011 전자통신동향분석 Vol.26 No.5
모바일 혁명과 빅데이터(big data) 시대에 접어들면서 사용자 중심의 자연스러운 인터페이스와 정보검색에 대한 요구가 늘어가고 있다. 모바일 환경에서의 쉽고 자연스러운 검색을 위해 음성인식 기술을 이용한 음성검색 서비스가 대세를 이루고 있으며 대화형 검색 서비스로 발전하게 될 것이다. 음성 대화 서비스의 주요 응용 분야인 음성검색 및 외국어 교육 서비스에서의 자연어 음성인식 기술 역할 및 사용자 경험을 바탕으로 하는 선순환 구조의 인식 성능 개선에 대해 소개한다. 또한 두 응용분야에서의 국내외 개발동향을 소개하고 실제 개발 사례를 통해 무제한급 자연어 음성인식 기술에 기반한 음성 대화 서비스의 가능성을 살펴본다.
정호영,이지윤,박양춘,정인철,조충식,Jeong, Ho-young,Lee, Ji-yoon,Park, Yang-chun,Jung, In-chul,Cho, Chung-sik 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.3
Objective: The purpose of this study was to develop a standard tool of pattern identification, which will be applied to clinical research, for benign prostatic hyperplasia. Method: The items and structure of the instrument were based on a review of the published literature in China and Korea. The advisory committee on this study included 11 kidney-endocrine professors of the Korean Medical Colleges Division and 4 Korean medicine doctors who had a doctor's degree in the Kidney-Endocrine Division. The advisory committee was questioned regarding pattern identification importance, symptom weight, treatment importance, changes in the symptoms, rare changes in the symptoms, and frequency of prescriptions regarding benign prostatic hyperplasia. Results: The Korean instrument of pattern identification was completed; it was composed of four questions for benign prostatic hyperplasia. Conclusion: We sincerely look forward to improving the instrument through the continuous clinical studies.
SPH 코드를 사용한 TBM 디스크커터의 암석 절삭에 대한 수치해석적 연구
정호영,전석원,조정우,Jeong, Ho-Young,Jeon, Seok-Won,Cho, Jung-Woo 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.3
본 연구에서는 SPH(Smoothed Particle Hydrodynamics) 코드를 사용하여 TBM에 장착되는 디스크커터에 의한 암석의 절삭과정을 모사하였다. 이를 위하여 본 연구에서는 3차원 FEM 해석 상용프로그램인 AUTODYN3D를 사용하였으며 이를 통해 국내 황등화강암을 대상으로 총 25개의 절삭조건에 대한 수치적인 절삭시험을 수행하였다. 암석과 디스크커터를 각각 라그란지안 솔버와 SPH 솔버를 사용하여 3차원 형상으로 모델링 하고 두 개의 디스크커터가 순차적으로 암석을 절삭하도록 모델링 하였다. 수치해석과 LCM시험에서 측정한 디스크커터의 작용력은 오차 10%이내의 값을 보여 대체로 일치하는 것으로 나타났고 균열의 전파양상과 암석의 파쇄양상 또한 유사한 것으로 나타났다. 또한 절삭된 최적 커터간격을 측정한 결과 LCM시험 결과와 일치하였다. 이를 통해 SPH코드를 사용한 수치해석기법의 적용성을 확인할 수 있었으나 해석시간을 단축하기 위한 Lagrange-SPH코드의 커플링에 관한 후속연구가 필요할 것으로 판단되었다. Numerical simulation on rock cutting by a TBM disc cutter was carried out using SPH (Smoothed Particle Hydrodynamics) code. AUTODYN3D, a commercial software program based on finite element method, was used in this study. The three-dimensional geometry of a disc cutter and a rock specimen were modeled by Lagrange and SPH code respectively. The numerical simulation was carried out for Hwangdeung granite for 10 different cutting conditions. The results of the numerical simulation, i.e. the relation between cutter force and failure behavior, had a good agreement with those from LCM test. The cutter forces measured in the numerical simulation had 10% deviation from the LCM test results. Moreover, the optimum cutter spacing was almost identical with the experimental results. These results indicate that SPH code can be successfully used had applicability for simulation on rock cutting by a TBM disc cutter. However, further study on Lagrange-SPH coupled modelling would be necessary to reduce the computation time.
정호영,장미호,홍규갑,조원철,이태식,Jung,Ho-Young,Jang,Mi-Ho,Hong,Gue-Gab,Cho,Won-Cheol,Lee,Tae-Shik 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
Korea`s road traffic has been the important role of social and economic development, and it`ll be a much more important in the future. But we require a far more efficient road traffic system to solve the problem of vehicle increases. So this paper is analyzed and researched both road traffic systems and road traffic safety, and hypothesized a solution to the problem by using small town`s road traffic system demands as a good example. The road traffic system should harmonize around the structure of the town, and be related to the safety, By analyzing road traffic system, we can understand how importantly the traffic system is related with safety, efficiency and overall benefits for our community.
Fast Time-Scale Modification of Speech Using Nonlinear Clipping Methods
정호영,김형순,이성주,Jung, Ho-Young,Kim, Hyung-Soon,Lee, Sung-Joo The Korean Society Of Phonetic Sciences And Speech 2006 말소리 Vol.59 No.-
Among the conventional time-scale modification (TSM) methods, the synchronized overlap and add (SOLA) method is widely used due to its good performance relative to computational complexity But the SOLA method remains complex due to its synchronization procedure using the normalized cross-correlation function. In this paper, we introduce a computationally efficient SOLA method utilizing 3 level center clipping method, as well as zero-crossing and level-crossing information. The result of subjective preference test indicates that the proposed method can reduce the computational complexity by over 80% compared with the conventional SOLA method without serious degradation of synthesized speech quality.
정호영,장미호,조원철,이태식,Jung. Ho-Young,Jang. Mi-Ho,Cho. Won-Cheol,Lee. Tae-Shik 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
These days, mankinds are exposed to many kinds of danger. So there`s sufferer supporting system needed for them to return to their everyday life as a social member after disaster. This research is aimed to look through the content of `sufferer life supporting`, and develop more efficient system.
일체형 재생연료전지 적용을 위한 sGO 함량 변화에 따른 sGO/sPEEK 복합막의 특성 평가
정호영,김민우,임지훈,최진혁,노성희,Jung, Ho-Young,Kim, Min-Woo,Lim, Ji-Hun,Choi, Jin H.,Roh, Sung-Hee 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.1
Polymer electrolyte membrane for unitized regenerative fuel cells requires high proton conductivity, high dimensional stability, low permeability, and low cost. However, DuPont's Nafion which is a commercial polymer electrolyte membrane has high permeability, high cost, and decreasing proton conductivity and dimensional stability over $80^{\circ}C$. To address these problems, sulfonated poly ether ether ketone (sPEEK) which is a low cost hydrocarbon polymer is selected as matrix polymer for the preparation of polymer electrolyte membrane. In addition, composite membrane with improved proton conductivity and dimensional stability is prepared by introducing sulfonated graphene oxide (sGO). The fundamental properties of polymer electrolyte membranes are analyzed by investigating membrane's water content, dimensional stability, proton conductivity, and morphology. The cell test is conducted to consider the possibility of application of sPEEK/sGO composite membrane for an unitized regenerative fuel cell.
정호영,김도영,은종관,이수영,Jung, Ho-Young,Kim, Do-Yeong,Un, Chong-Kwan,Lee, Soo-Young 한국음향학회 1995 韓國音響學會誌 Vol.14 No.5
본 논문에서는 청각 모델을 기초로 잡음에 강한 음성 특징 추출을 연구하였다. 청각모델은 basilar membrane 모델, 섬모세포(hair cell) 모델과 스펙트럼 출력단으로 구성하였다. Basilar membrane 모델은 음파의 진동에 따른 전달 특성을 묘사한 것으로 대역 통과 필터의 열로 나타난다. 섬모 세포 모델은 basilar membrane의 진동에 의한 신경 물질로의 변환을 나타낸다. 이것은 입력의 상대적인 값에 크게 반응하는 adaptation 기능을 이용하게 되며, 잡음 제거에 중요한 역할을 하게 된다. 스펙트럼 출력 단은 각 채널의 평균 firing rate를 이용하여 mean rate spectrum을 형성한다. 그리고 mean rate spectrum을 이용하여 특징 벡터를 추출하였다. 실험 결과는 청각 구조에 기초한 특징 추출이 다른 특징 추출 방법에 비해 잡음에서 더 향상된 성능을 가짐을 보였다. In this paper, we study a noise-robust feature extraction method of speech signal based on auditory modeling. The auditory model consists of a basilar membrane, a hair cell model and spectrum output stage. Basilar membrane model describes a response characteristic of membrane according to vibration in speech wave, and is represented as a band-pass filter bank. Hair cell model describes a neural transduction according to displacements of the basilar membrane. It responds adaptively to relative values of input and plays an important role for noise-robustness. Spectrum output stage constructs a mean rate spectrum using the average firing rate of each channel. And we extract feature vectors using a mean rate spectrum. Simulation results show that when auditory-based feature extraction is used, the speech recognition performance in noisy environments is improved compared to other feature extraction methods.
Cytosine Arabinoside 전처리가 척수후근절 외식편 배양에 미치는 영향
정호영,한성민,박종웅,윤인찬,Jung, H.Y.,Han, S.,Park, J.W.,Youn, I. 대한의용생체공학회 2015 의공학회지 Vol.36 No.6
Explant culture condition of dorsal root ganglion have been used to investigate the pathophysiology of peripheral nerve injury, while applying for the various clinical symptom such as trauma, pressure, and stretch. However, explant culture is usually contaminated by mitotic cells, which may observed as a newly divided cells including fibroblast or glia. The mitotic cells could be able to interrupt and change the cell signaling that make it difficult to avoid detrimental effects during the experiments. To eliminate mitotic cells, anti-mitotic reagents like mixture of uridine and 5-fluorodeoxyuridine or cytosine arabinoside were added to the cultures on the following day, but there is no research that investigate viability of anti-mitotic reagent in dorsal root ganglion explant culture. In this study, we investigate inhibition effect of cytosine arabinoside to mitotic cells in dorsal root ganglion explant culture. Also we visualized and analyzed anti-mitotic effect and toxicity of cytosine arabinoside in various concentration condition. This dorsal root ganglion explant culture condition can be applied to research that effect and mechanism of various stimulation and chemical application which affect peripheral nerve regeneration.