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Novel acoustic features for speech emotion recognition

Science China(Technological Sciences) 2009年第7期52卷 1838-1848页

作者： ROH Yong-Wan KIM Dong-Ju lee woo-Seok HONG Kwang-Seok School of Information and Communication Engineering Sungkyunkwan University300Chunchun-dongJangan-guSuwonKyungki-do440-746Korea Development Division / DSP Development Team Tamul Multimedia10th Fl.Anyang Trade Center1107Bisan-DongDongAn-GuAnyang-City431-050Korea

This paper focuses on acoustic features that effectively improve the recognition of emotion in human *** novel features in this paper are based on spectral-based entropy parameters such as fast Fourier transform(FFT) spectral entropy,delta FFT spectral entropy,Mel-frequency filter bank(MFB) spectral entropy,and Delta MFB spectral ***-based entropy features are *** reflect frequency characteristic and changing characteristic in frequency of *** implement an emotion rejection module using the probability distribution of recognized-scores and *** reduces the false recognition rate to improve overall ***-scores and rejected-scores refer to probabilities of recognized and rejected emotion recognition results,*** scores are first obtained from a pattern recognition *** pattern recognition phase uses the Gaussian mixture model(GMM).We classify the four emotional states as anger,sadness,happiness and *** proposed method is evaluated using 45 sentences in each emotion for 30 subjects,15 males and 15 *** results show that the proposed method is superior to the existing emotion recognition methods based on GMM using energy,Zero Crossing Rate(ZCR),linear prediction coefficient(LPC),and pitch *** demonstrate the effectiveness of the proposed *** of the proposed features,combined MFB and delta MFB spectral entropy improves performance approximately 10% compared to the existing feature parameters for speech emotion recognition *** demonstrate a 4% performance improvement in the applied emotion rejection with low confidence score.

关键词： speech emotion recognition MFB spectral entropy entropy emotion recognition rejection

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pH-induced structural changes of surface immobilized poly (L-lysine) by two-dimensional (2D) infrared correlation study

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Chinese Chemical Letters 2015年第2期26卷 173-176页

作者： Eun Joo Yoo Boknam Chae Young Mee Jung Seung woo lee School of Chemical Engineering Yeungnam University Pohang Accelerator Laboratory Department of Chemistry Kangwon National University

This paper reports the pH-induced structural changes in the surface immobilized poly（L-lysine）（PLL）***-dimensional（2D） correlation analysis was applied to the Fourier transform infrared（FTIR）spectra of the surface-immobilized PLL film to examine the spectral changes induced by the alternations of the protonation state of the amino group in the side *** spectral changes in the FTIR spectra of the PLL film were observed between pH 7 and *** decrease in the protonation state of the amino group in the side chain induced spectral changes in the amino group as well as conformational changes in the alky]group in the side *** pH 1-8,the spectral changes in the amino and alkyl groups in the side chain occurred before those of the amide group in the main chain of the surface immobilized PLL film.

关键词： Poly(L-lysine)(PLL) Surface-immobilized polypeptide FT-IR spectroscopy 2D correlation spectroscopy

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Formation and Thermal Stability of Large Precipitates and Oxides in Titanium and Niobium Microalloyed Steel

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Journal of Iron and Steel Research International 2008年第3期15卷 70-77页

作者： ZHUO Xiao-jun woo Dae-hee WANG Xin-hua lee Hae-geon Metallurgical and Ecological Engineering School University of Science and Technology Beijing Belling 100083 China Graduate Institute of Ferrous Technology Pohang University of Science and Technology Pohan4g 790 784 South Korea

As-cast CC slabs of microalloyed steels are prone to surface and sub-surface cracking. Precipitation phenomena initiated during solidification reduce ductility at high temperature. The unidirectional solidification unit is employed to simulate the solidification process during continuous casting. Precipitation behavior and thermal stability are systematically investigated. Samples of adding titanium and niobium to steels have been examined using field emission scanning electron microscope （FE-SEM）, electron probe X-ray microanalyzer （EPMA）, and transmission electron microscope （TEM）. It has been found that the addition of titanium and niobium to high-strength low-alloyed （HSLA） steel resulted in undesirable large precipitation in the steels, i. e. , precipitation of large precipitates with various morphologies. The composition of the large precipitates has been determined, The effect of cooling rate on （Ti, Nb）（C, N） precipitate formation is investigated. With increasing the cooling rate, titanium-rich （Ti,Nb）（C,N） precipitates are transformed to niobium-rich （Ti,Nb）（C,N） precipitates. The thermal stability of these large precipitates and oxides have been assessed by carrying out various heat treatments such as holding and quenching from temperature at 800 and 1 200℃. It has been found that titanium-rich （Ti,Nb）（C,N） precipitate is stable at about 1 200 ℃ and niobium-rich （Ti,Nb）（C,N） precipitate is stable at about 800 ℃. After reheating at 1 200℃ for 1 h, （Ca,Mn）S and TiN are precipitated from Ca-Al oxide. However, during reheating at 800 ℃ for l h, Ca-Al-Ti oxide in specimens was stable. The thermodynamic calculation of simulating the thermal process is employed. The calculation results are in good agreement with the experimental results.

关键词： carbonitride microsegregation dendritic region unidirectional solidification heat treatment thermal stability

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Characteristic evaluation of Al_2O_3/CNTs hybrid materials for micro-electrical discharge machining

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 28-32页

作者： Hyun-Seok TAK Chang-Seung HA Ho-Jun lee Hyung-woo lee Young-Keun JEONG Myung-Chang KANG National Core Research Center for Hybrid Materials Solution Pusan National University Department of Electrical Engineering Pusan National University

The characteristic evaluation of aluminum oxide （A1203）/carbon nanotubes （CNTs） hybrid composites for micro-electrical discharge machining （EDM） was described. Alumina matrix composites reinforced with CNTs were fabricated by a catalytic chemical vapor deposition method. A1203 composites with different CNT concentrations were synthesized. The electrical characteristic of A1203/CNTs composites was examined. These composites were machined by the EDM process according to the various EDM parameters, and the characteristics of machining were analyzed using field emission scanning electron microscope （FESEM）. The electrical conductivity has a increasing tendency as the CNTs content is increased and has a critical point at 5% A1203 （volume fraction）. In the machining accuracy, many tangles of CNT in A1203/CNTs composites cause violent spark. Thus, it causes the poor dimensional accuracy and circularity. The results show that conductivity of the materials and homogeneous distribution of CNTs in the matrix are important factors for micro-EDM of A1203/CNTs hybrid composites.

关键词： A1203/CNTs hybrid materials micro-electrical discharge machining micro-hole electrical conductivity

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Recoverable SnO_2-Based Sensors Promoted with MoO_3 and Sb_2O_3 for the Detection of DMMP

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稀有金属材料与工程 2006年第A3期35卷 155-156页

作者： woo Suk lee Ho Yun Choi Soo Chool lee Soo Jae lee Duk Dong lee Jeung Soo Huh Jae Chang Kim Department of Chemical Engineering Kyungpook National UniversityDaegu 702-701Korea School of Electrical Engineering and Computer Science Kyungpook National UniversityDaegu 702-701Korea Department of Materials Science and Metallurgy Kyungpook National UniversityDaegu 702-701Korea

The sensitivity and the recovery behavior of SnO_2-based gas sensor prepared from a commercial SnO_2 powder were tested under the low concentration of DMMP(0.5μg/g) in the flow system at 350℃.In order to improve the sensitivity of the sensor,promoters such as NiO,Nb_2O_5,MoO_3,and Sb_2O_3 were added into SnO_2 *** sensitivities were increased up to 80% from 50% but they were not *** the SnO2-based gas sensor promoted with MoO_3 and Sb_2O_3 was recovered after detection of DMMP,although the recovery rate was *** particular,the SnO_2-based sensor promoted with 5wt% of MoO_3 and 1wt% of Sb_2O_3 simultaneously showed an complete recovery ability,though its sensitivity was 40% which was lower than that of SnO_2 gas sensor without *** ability was discussed in terms of catalytic roles of promoters.

关键词： SnO2 MoO3 Sb2O3 sensor,recovery DMMP

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Spatio-temporal change in forest cover and carbon storage considering actual and potential forest cover in South Korea

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Science China(Life Sciences) 2015年第7期58卷 713-723页

作者： NAM Kijun lee woo-Kyun KIM Moonil KWAK Doo-Ahn BYUN woo-Hyuk YU Hangnan KWAK Hanbin KWON Taesung SUNG Joohan CHUNG Dong-Jun lee Seung-Ho Division of Environmental Science and Ecological Engineering Korea University GIS/RS Center for Environmental Resources Korea University Division of Forest Ecology Korea Forest Research Institute National Forestry Cooperative Federation Division of Forest Economics & Management Korea Forest Research Institute

This study analyzes change in carbon storage by applying forest growth models and final cutting age to actual and potential forest cover for six major tree species in South Korea. Using National Forest Inventory data, the growth models were developed to estimate mean diameter at breast height, tree height, and number of trees for Pinus densiflora, Pinus koraiensis, Pinus rigida, Larix kaernpferi, Castanea crenata and Quercus spp. stands. We assumed that actual forest cover in a forest type map will change into potential forest covers according to the Hydrological and Thermal Analogy Groups model. When actual forest cover reaches the final cutting age, forest volume and carbon storage are estimated by changed forest cover and its growth model. Forest volume between 2010 and 2110 would increase from 126.73 to 157.33 m^3 hm^-2. Our results also show that forest cover, volume, and carbon storage could abruptly change by 2060. This is attributed to the fact that most forests are presumed to reach final cutting age. To avoid such dramatic change, a regeneration and yield control scheme should be prepared and implemented in a way that ensures balance in forest practice and yield.

关键词： climate change final cutting age carbon storage national forestry inventory forest growth model

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Effect of molybdenum on interfacial properties of titanium carbide reinforced Fe composite

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Journal of Materials Science & Technology 2022年第12期107卷 252-258页

作者： Seungchan Cho Junghwan Kim Ilguk Jo Jae Hyun Park Jaekwang lee Hyun-Uk Hong Bong Ho lee wook Ryol Hwang Dong-woo Suh Sang-Kwan lee Sang-Bok lee Composites Research Division Korea Institute of Materials Science(KIMS)Changwon 51508South Korea Advanced Materials Engineering Dong-Eui UniversityBusan 47340South Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityJinju 52828South Korea Department of Physics Pusan National UniversityBusan 46241South Korea Department of Materials Convergence and System Engineering Changwon National UniversityChangwon 51140South Korea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea School of Mechanical Engineering Gyeongsang National UniversityJinju 52828South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyGyeongbuk 37673South Korea

This study shows that the mechanical strength of the composite of Fe matrix and titanium carbide(Ti C)ceramic particles is significantly enhanced with addition of molybdenum(Mo) atoms. Ti C reinforced Fe(Fe-0.2C-7Mn) composites with and without Mo were fabricated by a liquid pressing infiltration(LPI)process and the effect of Mo on interfacial properties of TiC–Fe composite was investigated using atomic probe tomography(APT) analysis, molecular dynamics(MD) simulations, first-principle density functional theory(DFT), and thermodynamic calculations. First, DFT calculations showed that total energies of the Mo-doped Ti C–Fe superlattices strongly depend on the position of Mo defects, and are minimized when the Mo atom is located at the TiC/Fe interface, supporting the probable formation of MoC-like interphase at the TiC/Fe interface region. Then, APT analysis confirmed the DFT predictions by finding that about6.5 wt.% Mo is incorporated in the Ti C–Fe(Mo) composite and that sub-micrometer thick(Ti,Mo)C interphase is indeed formed near the interface. The MD simulations show that Mo atoms migrate to the Mo-free TiC–Fe interface at elevated temperatures and the mechanical strength of the interface is considerably enhanced, which is in good agreement with experimental observations.

关键词： Metal matrix composites(MMCs) Titanium carbide Fe matrix composite Infiltration Molybdenum Interfacial property

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Vasorelaxant effects of 50 commonly used traditional herbal prescriptions on isolated rat aortic rings

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Journal of Traditional Chinese Medicine 2020年第4期40卷 629-639页

作者： Bumjung Kim Cheolmin Jo Somin lee Hanna Choi Kwang-woo Kim Inhye Ham Ho-Young Choi Kyungjin lee Department of Oriental Health Management Kyung Hee Cyber UniversitySeoul 02447Republic of Korea Department of Herbal pharmacology College of Korean MedicineKyung Hee UniversitySeoul 02447Republic of Korea Department of Herbal pharmacology Graduate SchoolKyung Hee UniversitySeoul 02447Republic of Korea Department of Biomedical Science and Technology Graduate SchoolKyung Hee UniversitySeoul 02447Republic of Korea

OBJECTIVE:To investigate the vasorelaxant activities of 50 common traditional herbal prescriptions(THPs)on isolated rat aortic ***:An electric extractor was used to extract *** aortic rings were precontracted using phenylephrine in organ chambers containing Krebs-Henseleit *** of THPs were added in increasing concentrations(10-1000μg/mL)to investigate vasorelaxant *** vasorelaxant effects of THPs were calculated as percentage of contraction in response to ***:Several THPs such as Tianwangbuxin Dan,Banxiaxiexin Tang,and Mahuang Tang,significantly relaxed precontracted aortic *** contrast,Xiaochaihu Tang,Shensuyin,and Guizhifuling Wan significantly contracted aortic ***,these THPs increasingly relaxed or contracted aortic rings relaxed by ***:Our findings suggest that hypertension can be treated using *** some THPs can counteract treatment of *** studies should be developed on use of THPs for treatment of hypertension are critical,and guidelines for use of traditional herbal medicines to treat hypertension.

关键词： Hypertension Vasodilation Vasoconstriction Herbal medicine

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Mechanical strength and corrosion resistance of Al-additive friction stir welded AZ31B joints

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Journal of Magnesium and Alloys 2023年第5期11卷 1519-1535页

作者： Jae-Yeon Kim Eun-woo Kim Dong-O Kim Eun-Kyo Ju Ji-Eun lee Jaeheon lee Jai-Won Byeon Mining Engineering Department Colorado School of MinesGoldenCO 80401USA Department of Materials Science and Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea

Compared to other structural alloys,magnesium alloys have a relatively poor corrosion resistance and low mechanical strength,which can be further deteriorated when these alloys are subjected to joining processes using the existing joining ***,we propose for the first time an additive friction stir-welding(AFSW)using fine Al powder as an additive to improve the mechanical strength as well as corrosion resistance of AZ31B weld *** is a solid-state welding method of forming a high-Al AZ31B joint via an in-situ reaction between pure Al powders filled in a machined groove and the AZ31B *** optimize the process parameters,AFSW was performed under different rotational and transverse speeds,and number of passes,using tools with a square or screw *** particular,to fabricate a weld zone,where the Al was homogenously dispersed,the effects of the groove shape were investigated using three types of grooves:surface one-line groove,surface-symmetric grooves,and inserted symmetric *** homogenous and defect-less AFS-welded AZ31B joint was successfully fabricated with the following optimal parameters:1400 rpm,25 mm/min,four passes,inserted symmetric grooves,and the tool with a square *** AFSW fully dissolved the additive Al intoα-Mg and in-situ precipitated Mg_(17)Al_(12)particles,which was confirmed via scanning electron microscopy,transmission electron microscope,and X-ray diffraction *** microhardness,joint efficiency,and elongation at the fracture point of the AFS-welded AZ31B joint were 80 HV,101%,and 8.9%,*** values are higher than those obtained for the FS-welded AZ31 joint in previous *** corrosion resistance of the AFS-welded AZ31B joint,evaluated via hydrogen evolution measurements and potentiodynamic polarization tests,was enhanced to 55%relative to the FS-welded AZ31B joint.

关键词： AZ31B magnesium alloy Additive friction stir-welding In-situ reaction Mg_(17)Al_(12)particles Joint efficiency Corrosion resistance

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Role of oregano and Citrus species-based essential oil preparation for the control of coccidiosis in broiler chickens

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Journal of Animal Science and Biotechnology 2021年第3期12卷 1089-1097页

作者： Francisco Xavier Gordillo Jaramillo Da-Hye Kim Sang Hyeok lee Sun-Kwan Kwon Rajesh Jha Kyung-woo lee Department of Animal Science and Technology Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea Harim Bio Research Center Jeilfeed Co.LTD136 Techno2-roYuseong-guDeajeon-si 34025Republic of Korea Department of Human Nutrition Food and Animal SciencesCollege of Tropical Agricultural and Human ResourcesUniversity of Hawaii at ManoaHonoluluHI 96822USA

Background:Due to presence of drug-resistant Eimeria strains and raised public health safety concerns about drug residues in the meat,there is renewed interest in the search for natural alternatives to the coccidiosis control *** study was conducted to test the anticoccidial efficacy of oregano and Citrus spp.-based essential oils for ***:A total of 2807-day-old broiler chicks were fed a control diet or diets with salinomycin or essential oils for up to 35 d of *** d 14,half of the control groups and the treated groups were orally challenged with a coccidiosis vaccine at 25 times higher than the recommended vaccine *** diet-fed chickens that were gavaged with phosphate-buffered saline were considered non-challenged control ***:Eimeria challenge or dietary additives failed to affect growth performance during the 7 to 20 d growth period although essential oil-fed chickens exhibited the lowest body wight gain(P=0.332)and the highest feed conversion ratio(P=0.062).Oocysts in the litter were detected in the challenged control diet group and the challenged/essential oil-fed groups at 21 and 35 d,*** dismutase activity in the serum was elevated(P=0.059)in the salinomycin-fed chickens compared to the challenged ***-1-acid glycoprotein was decreased by 28.7%in the salinomycin-fed chickens but increased by 38.1%in the essential oil group compared with the challenged control *** control group exhibited a significantly higher cooking loss of the thigh meat,compared to the non-challenged control diet group,which was marginally mitigated by dietary supplementation with essential *** fed essential oil-added diet had the highest branched-chain fatty acids contents in the ***:In conclusion,this study shows that oregano and Citrus-based essential oil preparation did not affect growth performance in broiler chickens challenged with the coccidiosis vaccine nor did Eimeria-spec

关键词： Broiler chickens Coccidiosis Essential oils Growth performance Salinomycin

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