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Noise Robust Automatic Speech Recognition Scheme with Histogram of Oriented Gradient Features
Park, Taejin,Beack, SeungKwan,Lee, Taejin The Institute of Electronics and Information Engin 2014 IEIE Transactions on Smart Processing & Computing Vol.3 No.5
In this paper, we propose a novel technique for noise robust automatic speech recognition (ASR). The development of ASR techniques has made it possible to recognize isolated words with a near perfect word recognition rate. However, in a highly noisy environment, a distinct mismatch between the trained speech and the test data results in a significantly degraded word recognition rate (WRA). Unlike conventional ASR systems employing Mel-frequency cepstral coefficients (MFCCs) and a hidden Markov model (HMM), this study employ histogram of oriented gradient (HOG) features and a Support Vector Machine (SVM) to ASR tasks to overcome this problem. Our proposed ASR system is less vulnerable to external interference noise, and achieves a higher WRA compared to a conventional ASR system equipped with MFCCs and an HMM. The performance of our proposed ASR system was evaluated using a phonetically balanced word (PBW) set mixed with artificially added noise.
Taejin Choi,Yong Il Lee 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
Apatite and zircon fision track (FT) analyses werecarried out to reconstruct the thermal histories of the CretaceousPungam and Yeongdong basins, Korea. These basins were formedalong the sinistral strike-slip faults in the Early Cretaceous andwere compressed in the Late Cretaceous by transpressional stressesdue to the change in subduction direction of the Kula/Pacific Plate.sistent FT ages of ca. 50 Ma and ca. 63 Ma, respectively, muchyounger than their stratigraphic ages. In contrast, the zircon FTages of both basins show relatively wide ranges, i.e., from 89 to70 Ma in the Pungam Basin, and from 83 to 64 Ma in the Yeo-ngdong Basin. Zircon single-grain age spectra also show multipleage populations. Co-existence of both the older and younger FTages in comparison to the depositional age (Pungam Basin: ~70Ma, Yeongdong Basin: ~100 Ma) indicates that the zircon samplesfrom both basins were partially annealed. The Pungam Basin wasvolcanic activity and associated hydrothermal fluid, then cooledbelow the apatite closure temperature at ca. 50 Ma. The Yeong-dong Basin was also heated into the ZPAZ after deposition byburial and volcanic activity, then cooled down below the apatiteclosure temperature at ca. 63 Ma, and was uplifted to the presentsurface. Comparing these data with those of the GyeongsangBasin, the response to transpressional stresses seems not to be con-trolled by the distance of the basin from the active continentalmargin. Further studies are needed to clarify such tectonic inver-sion of the sedimentary basins in the active continental margin.
Effect of Surface Oxidation Layer on Tensile Strength of Cu-Ni Alloy in Friction Stir Welding
Taejin Yoon,Sangwon Park,Sungwook Chung,Joongsuk Noh,Kwangho Kim,Chungyun Kang 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.3
Friction stir welding (FSW) of thick Cu-Ni plate was successfully completed. The fracture position after tensile testing was located at the weld nugget zone (WNZ), where surface oxidation occurred. The oxidation morphologies on the surface of the base metal were analyzed by SEM, EPMA and XRD, with the oxide layer being obtained by simple and useful way to analyze the oxide products, namely, collecting oxide powders after immersing of the oxidized specimen into HNO3 solution. The results highlighted that an oxide layer of 30 μm thickness consists of a mixture of two phases, Cu2O and NiO, on the surface of the base metal. After FSW, the thickness of the oxide layer on the surface was decreased to approximately 5 μm, and broken oxide particles, which is NiO, penetrated into the WNZ by the rotating tool. NiO was preferentially formed at the surface after FSW because it has a lower Gibbs free energy value at 950 °C, which is the peak temperature measured during FSW. Oxide layer of Cu-Ni plate was clearly only removed by mechanical method grinding with 1200-grit SiC paper. The removal of oxide layer results in improved mechanical strength.
Taejin Kim,Jeong Seon Sang,Myung-Ja Park 복식문화학회 2017 服飾文化硏究 Vol.25 No.6
This study aims to gather precise information on the real fabric color and texture, and purchasing intention of mobile shoppers buying clothes. Eighty volunteers participated in the sensory test on three smartphones with four colors and two fabricssmooth taffeta and hairy doeskin. This study carried out the posteriori test using the one-way ANOVA and Duncan test by SPSS21.0. In the analysis’ results of color preference, there were no differences among the four colors of taffeta between the smartphones, but different preferences between the red and yellow doeskin exist. In the case of the Samsung phone, which has an immense color distortion, the red fabric has a low color preference. In contrast, on the Apple phone yellow fabric had the highest preference because of its brightness. The Apple phone also has the highest purchasing intention of yellow colored taffeta, which is similar to the color preference results, although the real fabric has the opposite result. For doeskin, the real red and blue colored fabric has the highest purchasing intention. The Samsung phone has the biggest color mismatch with the real fabric. It also has the lowest purchasing intention of red taffeta fabric, while the LG phone has the lowest purchasing intention of blue fabric. Using the paired comparison method of the similarity between ‘real’ fabrics and the mobile version of fabric colors has a low similarity on all four colors of taffeta and doeskin fabrics. Therefore it can be concluded that phones do not represent the ‘real’ fabric color.
A Spatial Audio System Using Multiple Microphones on a Rigid Sphere
Taejin Lee,강경옥,김진웅,정대권,Daeyoung Jang,Hareo Hamada 한국전자통신연구원 2005 ETRI Journal Vol.27 No.2
The main purpose of a spatial audio system is to give a listener the same impression as if he/she were present in a recorded environment. A dummy head microphone is generally used for such purposes. Because of its humanlike shape, we can obtain good spatial sound images. However, its shape is a restriction on its public use and it is difficult to convert a 2-channel recording into multichannel signals for an efficient rendering over a multispeaker arrangement. In order to solve the problems mentioned above, a spatial audio system is proposed that uses multiple microphones on a rigid sphere. The system has five microphones placed on special points of the rigid sphere, and it generates audio signals for headphone, stereo, stereo dipole, 4-channel, and 5-channel reproduction environments. Subjective localization experiments show that front/back confusion, which is a common limitation of spatial audio systems using the dummy head microphone, can be reduced dramatically in 4-channel and 5-channel reproduction environments and can be reduced slightly in a headphone reproduction