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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.
Klein Factors and Fermi-Bose Equivalence
Taejin LEE 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.11
Generalizing the kink operator of the Heisenberg spin 1/2 model, we construct a set of Klein factors explicitly such that (1+1)-dimensional fermion theories with an arbitrary number of species are mapped onto the corresponding boson theories with the same number of species and vice versa. The actions for the resultant theories do not possess a nontrivial Klein factor. With this set of Klein factors, we are also able to map the simple boundary states, such as the Neumann and the Dirichlet boundary states, of the fermion (boson) theory onto those of the boson (fermion) theory. Applications of the Fermi-Bose equivalence with the constructed Klein factors to well-known (1+1)- dimensional theories have been discussed.
FineDedup: A Fine-grained Deduplication Technique for Extending Lifetime of Flash-based SSDs
Taejin Kim,Jihong Kim,Sungjin Lee 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.5
Data deduplication is an effective solution in improving the lifetime of flash-based solid-state drives (SSDs) by preventing redundant data from being written to flash memory. Existing deduplication techniques for SSDs, however, fail to fully eliminate potential redundant data because of their coarsegrained granularity. In this paper, a fine-grained deduplication technique for SSDs, called FineDedup, is proposed to improve the likelihood of eliminating redundant data. FineDedup also resolves technical difficulties caused by its finer granularity, i.e., increased memory requirement and read response time. The results show that FineDedup reduces the amount of written data by up to 24% over existing techniques with negligible.
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.