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포만트 공간에서의 주파수 변환을 이용한 이중 언어 음성 변환 연구
채의근(Chae, Yi-Geun),윤영선(Yun, Young-Sun),정진만(Jung, Jin Man),은성배(Eun, Seongbae) 한국음성학회 2014 말소리와 음성과학 Vol.6 No.4
This paper describes several approaches to transform a speaker’s individuality to another’s individuality using frequency warping between bilingual formant frequencies on different language environments. The proposed methods are simple and intuitive voice conversion algorithms that do not use training data between different languages. The approaches find the warping function from source speaker’s frequency to target speaker’s frequency on formant space. The formant space comprises four representative monophthongs for each language. The warping functions can be represented by piecewise linear equations, inverse matrix. The used features are pure frequency components including magnitudes, phases, and line spectral frequencies (LSF). The experiments show that the LSF-based voice conversion methods give better performance than other methods.
토지이용도와 기상모델을 이용한 서울기후분석(CAS)지도 개발
이채연 ( Chae Yeon Yi ),엄정희 ( Jeong Hee Eum ),최영진 ( Young Jean Choi ),김규랑 ( Kyu Rang Kim ),( Dieter Scherer ),( Ute Fehrenbach ),김근회 ( Geun Hoi Kim ) 한국지리정보학회 2011 한국지리정보학회지 Vol.14 No.1
도시 및 환경계획에서는 국지적 기후에 미치는 부정적인 영향을 줄이고 긍정적인 영향을 지속시킬 수 있는 계획 도출이 필요하다. 본 연구는 서울의 도시 및 환경계획 수립을 위해 국지 기온과 바람의 흐름을 고려하여 현실적인 기후분석지도의 개발을 목적으로 수행되었다. 서울기후분석(Climate Analysis Seoul, CAS) 지도는 서울의 도시환경 구조 변화 양상을 적시에 반영하기 위하여 도시기후 분석 및 기후지도 프로세스를 갖춘 전자지도(digital map)이다. 지면의 피복과 기복에 대한 분석자료와 중규모 기상모델인 MetPhoMod의 모의수행 분석결과를 바탕으로 찬공기 생성·이동·정체, 바람흐름, 열적 환경 등을 정량적으로 분석한 결과가 CAS 지도에 담겨있다. 본 연구에서 개발된 CAS를 이용함으로써 도시 개발이 기후에 미치는 영향의 분석 및 평가가 용이하게 되었다. 도시기후분석지도를 통해 도시 및 환경 분야의 계획 과정에서 삶의 질 향상을 위한 기후요소의 활용이 더욱 편리해 질 것으로 기대한다. It is needed to preserve good effects and to prevent bad influences on local climate in urban and environmental planning. This study seeks to develop climate analysis maps to provide realistic information considering local air temperature and wind flows. Quantitative analyses are conducted by CAS for the production, transportation, and stagnation of cold air, wind flow and thermal conditions by incorporating GIS analysis on land cover and elevation and meteorological analysis from MetPhoMod - a mesoscale weather model. The CAS helps The easier analysis and assessment of urban development on local climate. It will contribute to the better life of the people in cities by providing better understanding of the local climate to the urban space planners.
More Efficient k-Modes Clustering Algorithm
Kim, Dae-Won,Chae, Yi-Geun 한국데이터정보과학회 2005 한국데이터정보과학회지 Vol.16 No.3
A hard-type centroids in the conventional clustering algorithm such as k-modes algorithm cannot keep the uncertainty inherently in data sets as long as possible before actual clustering(decision) are made. Therefore, we propose the k-populations algorithm to extend clustering ability and to heed the data characteristics. This k-population algorithm as found to give markedly better clustering results through various experiments.
Performance Comparison of Sensor-Programming Schemes According to the Shapes of Obstacles
Chung, Jong-In,Chae, Yi-Geun The Institute of Internet 2021 International Journal of Internet, Broadcasting an Vol.13 No.3
MSRDS(Microsoft Robotics Developer Studio) provides the ability to simulate these technologies. SPL(Simple Programming Language) of MSRDS provides many functions for sensor programming to control autonomous robots. Sensor programming in SPL can be implemented in two types of schemes: procedure sensor notification and while-loop schemes. We considered the three programming schemes to control the robot movement after studying the advantages and disadvantages of the sensor notification procedure and the while-loop scheme. We also created simulation environments to evaluate the performance of the three considered schemes when applied to four different mazes. The simulation environment consisted of a maze and a robot with the most powerful sensor, i.e., the LRF(Laser Range Finder) sensor. We measured the required travel time and robot actions (number of turns and number of collisions) needed to escape the maze and compared the performance outcomes of the three considered schemes in the four different mazes.
Thermoluminescence Fading in ZnO Irradiated by Beta-rays
Sang Min PARK,홍사용,Yi Geun Chae 한국물리학회 2014 새물리 Vol.64 No.6
In this study, zinc oxide (ZnO) powder was fabricated using the combustion technique, and its thermoluminescence (TL) fading behavior was observed. An X-ray diffraction test was conducted to confirm the hexagonal lattice of ZnO. Further, to investigate the luminescence spectrum produced by the TL, the photoluminescence (PL) spectrum generated by a 325 nm laser was measured. The luminescence spectrum was divided into UV (390 nm), green (530 nm), and red (630 mm) domains. To obtain the TL glow curve, the ZnO powder was irradiated by beta-rays, and the TL intensity was measured as it heated from room temperature to 350℃. Here, if the ZnO powder is maintained at room temperature for a certain period of time after beta-ray irradiation, the TL glow curve changes because of the fading effect; to explain this, the energy band model was used. The 83℃ TL peak, which had a mean lifetime of 31 min, showed the greatest fading; in contrast, the intensity of the TL peak at 196℃ increased over time. Therefore, the TL fading behavior of ZnO should be considered in radiation dosimetry.
Gyo In,Nam-Geun Ahn,Bong-Seok Bae,Myoung-Woo Lee,Hee-Won Park,Kyoung Hwa Jang,Byung-Goo Cho,Chang Kyun Han,Chae Kyu Park,Yi-Seong Kwak 고려인삼학회 2017 Journal of Ginseng Research Vol.41 No.3
Background: The chemical constituents of Panax ginseng are changed by processing methods such as steaming or sun drying. In the present study, the chemical change of Panax ginseng induced by steaming was monitored in situ. Methods: Samples were separated from the same ginseng root by incision during the steaming process, for in situ monitoring. Sampling was sequentially performed in three stages; FG (fresh ginseng) / SG (steamed ginseng) / RG (red ginseng) and 60 samples were prepared and freeze dried. The samples were then analyzed to determine 43 constituents among three stages of P. ginseng. Results: The results showed that six malonyl-ginsenoside (Rg1, Rb1, Rb3, Rc, Rd, Rb2) and 15 amino acids were decreased in concentration during the steaming process. In contrast, ginsenoside-Rh1, 20(S)-Rg2, 20(S, R)-Rg3 and Maillard reaction product such as AF (arginine-fructose), AFG (arginine-fructoseglucose), and maltol were newly generated or their concentrations were increased. Conclusion: This study elucidates the dynamic changes in the chemical components of P. ginseng when the steaming process was induced. These results are thought to be helpful for quality control and standardization of herbal drugs using P. ginseng and they also provide a scientific basis for pharmacological research of processed ginseng (Red ginseng).
In, Gyo,Ahn, Nam-Geun,Bae, Bong-Seok,Lee, Myoung-Woo,Park, Hee-Won,Jang, Kyoung Hwa,Cho, Byung-Goo,Han, Chang Kyun,Park, Chae Kyu,Kwak, Yi-Seong The Korean Society of Ginseng 2017 Journal of Ginseng Research Vol.41 No.3
Background: The chemical constituents of Panax ginseng are changed by processing methods such as steaming or sun drying. In the present study, the chemical change of Panax ginseng induced by steaming was monitored in situ. Methods: Samples were separated from the same ginseng root by incision during the steaming process, for in situ monitoring. Sampling was sequentially performed in three stages; FG (fresh ginseng) ${\rightarrow}$ SG (steamed ginseng) ${\rightarrow}$ RG (red ginseng) and 60 samples were prepared and freeze dried. The samples were then analyzed to determine 43 constituents among three stages of P. ginseng. Results: The results showed that six malonyl-ginsenoside (Rg1, Rb1, Rb3, Rc, Rd, Rb2) and 15 amino acids were decreased in concentration during the steaming process. In contrast, ginsenoside-Rh1, 20(S)-Rg2, 20(S, R)-Rg3 and Maillard reaction product such as AF (arginine-fructose), AFG (arginine-fructose-glucose), and maltol were newly generated or their concentrations were increased. Conclusion: This study elucidates the dynamic changes in the chemical components of P. ginseng when the steaming process was induced. These results are thought to be helpful for quality control and standardization of herbal drugs using P. ginseng and they also provide a scientific basis for pharmacological research of processed ginseng (Red ginseng).