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Histogram equalization using a reduced feature set of background speakers' utterances for speaker recognition

Frontiers of Information Technology & Electronic Engineering 2017年第5期18卷 738-750页

作者： myung-jae kim Il-ho YANG Min-seok kim Ha-jin YU School of Computer Science University of Seoul

We propose a method for histogram equalization using supplement sets to improve the performance of speaker recognition when the training and test utterances are very short. The supplement sets are derived using outputs of selection or clustering algorithms from the background speakers' utterances. The proposed approach is used as a feature normalization method for building histograms when there are insufficient input utterance *** addition, the proposed method is used as an i-vector normalization method in an i-vector-based probabilistic linear discriminant analysis(PLDA) system, which is the current state-of-the-art for speaker verification. The ranks of sample values for histogram equalization are estimated in ascending order from both the input utterances and the supplement set. New ranks are obtained by computing the sum of different kinds of ranks. Subsequently, the proposed method determines the cumulative distribution function of the test utterance using the newly defined ranks. The proposed method is compared with conventional feature normalization methods, such as cepstral mean normalization(CMN), cepstral mean and variance normalization(MVN), histogram equalization(HEQ), and the European Telecommunications Standards Institute(ETSI) advanced front-end methods. In addition, performance is compared for a case in which the greedy selection algorithm is used with fuzzy C-means and K-means *** YOHO and Electronics and Telecommunications Research Institute(ETRI) databases are used in an evaluation in the feature space. The test sets are simulated by the Opus Vo IP codec. We also use the 2008 National Institute of Standards and Technology(NIST) speaker recognition evaluation(SRE) corpus for the i-vector system. The results of the experimental evaluation demonstrate that the average system performance is improved when the proposed method is used, compared to the conventional feature normalization methods.

关键词： Speaker recognition Histogram equalization i-vector

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Multi-Stream CNN-Based Personal Recognition Method Using Surface Electromyogram for 5G Security

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Computers, Materials & Continua 2022年第8期72卷 2997-3007页

作者： Jin Su kim Min-Gu kim jae myung kim Sung Bum Pan IT Research Institute Chosun UniversityGwangju61452Korea Interdisciplinary Program in IT-Bio Convergence System Chosun UniversityGwangju61452Korea

As fifth generation technology standard(5G)technology develops,the possibility of being exposed to the risk of cyber-attacks that exploits vulnerabilities in the 5G environment is *** existing personal recognitionmethod used for granting permission is a password-basedmethod,which causes security ***,personal recognition studies using bio-signals are being conducted as a method to access control to *** bio-signal,surface electromyogram(sEMG)can solve the existing personal recognition problem that was unable to the modification of registered information owing to the characteristic changes in its signal according to the performed ***,as an advantage,sEMG can be conveniently measured from arms and *** paper proposes a personal recognition method using sEMG,based on a multi-stream convolutional neural network(CNN).The proposed method decomposes sEMG signals into intrinsic mode functions(IMF)using empirical mode decomposition(EMD)and transforms each IMF into a *** recognition is performed by analyzing time–frequency features from the spectrogram transformed *** database(DB)adopted in this paper is the Ninapro DB,which is a benchmark EMG *** experimental results indicate that the personal recognition performance of the multi-stream CNN using the IMF spectrogram improved by 1.91%,compared with the singlestream CNN using the spectrogram of raw sEMG.

关键词： Personal recognition electromyogram signal multi-stream network empirical mode decomposition

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User Recognition System Based on Spectrogram Image Conversion Using EMG Signals

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Computers, Materials & Continua 2022年第7期72卷 1213-1227页

作者： jae myung kim Gyu Ho Choi Min-Gu kim Sung Bum Pan Interdisciplinary Program in IT-Bio Convergence System Chosun UniversityGwangju61452Korea IT Research Institute Chosun UniversityGwangju61452Korea

Recently,user recognitionmethods to authenticate personal identity has attracted significant attention especially with increased availability of various internet of things(IoT)services through fifth-generation technology(5G)based mobile *** EMG signals generated inside the body with unique individual characteristics are being studied as a part of nextgeneration user recognition ***,there is a limitation when applying EMG signals to user recognition systems as the same operation needs to be repeated while maintaining a constant strength of muscle over ***,it is necessary to conduct research on multidimensional feature transformation that includes changes in frequency features over *** this paper,we propose a user recognition system that applies EMG signals to the short-time fourier transform(STFT),and converts the signals into EMG spectrogram images while adjusting the time-frequency resolution to extract multidimensional *** proposed system is composed of a data pre-processing and normalization process,spectrogram image conversion process,and final classification *** experimental results revealed that the proposed EMG spectrogram image-based user recognition system has a 95.4%accuracy performance,which is 13%higher than the EMGsignal-based *** a user recognition accuracy improvement was achieved by using multidimensional features,in the time-frequency domain.

关键词： EMG user recognition spectrogram CNN

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Regulation of sleep by astrocytes in the hypothalamic ventrolateral preoptic nucleus

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Neural Regeneration Research 2025年第4期20卷 1098-1100页

作者： jae-Hong kim Ruqayya Afridi Il-Sung Jang Maan Gee Lee Kyoungho Suk Brain Korea 21 four KNU Convergence Educational Program of Biomedical Sciences for Creative Future Talents School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacology School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacology School of DentistryKyungpook National UniversityDaeguRepublic of Korea Brain Science&Engineering Institute Kyungpook National UniversityDaeguRepublic of Korea

Astrocytes are functionally dynamic cells that support neurons in multiple ways throughout an organism’s *** astrocytic regulation of neuronal activity has been increasingly recognized in recent *** are now recognized as playing a more complex role than mere bystanders in the central nervous ***,their role in regulating the sleep neurocircuitry is not well *** this perspective,we highlight the role of astrocytes in sleep modulation,with a particular focus on regulatory mechanisms related to the ventrolateral preoptic nucleus(VLPO)of the *** briefly discuss recent literature reporting the role of VLPO astrocytes in regulating sleep-associated behaviors.

关键词： sleep ventrolateral astrocytes

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Early bile duct cancer

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World Journal of Gastroenterology 2007年第25期13卷 3409-3416页

作者： jae myung Cha myung-Hwan kim Se Jin Jang Department of Internal Medicine University of Kyunghee College of Medicine East-West Neo Medical Center Seoul Korea Department of Internal Medicine University of Ulsan College of Medicine Asan Medical Center Seoul Korea Department of Pathology University of Ulsan College of Medicine Asan Medical Center Seoul Korea

Bile duct cancers are frequently diagnosed as advanced diseases. Over half of patients with advanced bile duct cancer present with unresectable malignancies and their prognosis has been very poor even after curative resections. Although there has been a need to diagnose bile duct cancer at its eady stage, it has been a difficult goal to achieve due to our lack of knowledge regarding this disease entity. Early bile duct cancer may be defined as a carcinoma whose invasion is confined within the fibromuscular layer of the extrahepatic bile duct or intrahepatic large bile duct without distant metastasis irrespective of lymph node involvement. Approximately 3%-10% of resected bile duct cancers have been reported to be early cancers in the literature. The clinicopathological features of patients with early bile duct cancer differ from those of patients with advanced bile duct cancer, with more frequent asymptomatic presentation, characteristic histopathological findings, and excellent prognosis. This manuscript is organized to emphasize the need for convening an international consensus to develop the concept of early bile duct cancer.

关键词： Early bile duct cancer Prognosis Histopathology

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Comparison of excyclotorsion following graded inferior oblique recession for primary versus secondary inferior oblique overaction

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International Journal of Ophthalmology(English edition) 2020年第8期13卷 1281-1286页

作者： Donghun Lee Won jae kim myung Mi kim Department of Ophthalmology Catholic University of Daegu School of MedicineDaegu 42472Republic of Korea Department of Ophthalmology Yeungnam University Medical CenterDaegu 42415Republic of Korea Nune Eye Hospital Daegu 2179Republic of Korea

AIM:To compare the changes in excyclotorsion after inferior oblique(IO)recession in patients with primary and secondary inferior oblique overaction(IOOA).METHODS:We retrospectively analyzed the data obtained from patients with IOOA who underwent graded IO *** patients were followed up for at least 3 mo after *** photographs were taken preand postoperatively,and the sum of the angles of torsion in both eyes was used to analyze changes in *** were divided into two groups:those diagnosed with primary IOOA were enrolled in the 1’IOOA group,and those diagnosed with secondary IOOA caused by superior oblique palsy(SOP)were enrolled in the 2’IOOA *** before and after surgery were compared between the two ***:A total of 78 patients were enrolled in this study:34 eyes in the 1’IOOA group and 44 eyes in the 2’IOOA *** the 78 patients,torsional angle significantly decreased from 15.31°±7.40°to 12.11°±6.53°after IO recession(P<0.001).Mean preoperative torsional angle was larger in the 2’IOOA group than in the 1’IOOA group(P=0.03).In both groups,excyclotorsion significantly decreased after IO recession(P=0.001 and P<0.001,respectively);however,there was no significant difference in the amounts of changes in excyclotorsion between the two ***:Excyclotorsion is significantly larger in secondary IOOA than in primary IOOA,and a significant decrease in the torsional angle occurs after IO recession in both types of IOOA.

关键词： inferior oblique overaction inferior oblique recession ocular excyclotorsion strabismus

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Development and application of quantitative detection method for nervous necrosis virus(NNV) isolated from sevenband grouper Hyporthodus septemfasciatus

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Asian Pacific Journal of Tropical Medicine 2016年第8期9卷 720-726页

作者： Jong-Oh kim jae-Ok kim Wi-Sik kim myung-Joo Oh Department of Aqualife Medicine College of Fisheries and Ocean Science Chonnam National University

Objective:To develop the rapid and efficient quantitative detection tool for nervous necrosis virus isolated from sevenband grouper Hyporhodus ***:The viral genes of the NNV(SGYeosu08) isolated from sevenband grouper were phylogenetically *** addition,novel quantitative PCR primers based on the genomic sequence of SGYeosu08 isolate were designed and compared it with the conventional bio-assay method(TCID_(50)) using in vitro and in vivo ***:The phylogenetic analysis of viral genes demonstrated the relationship of SGYeosu08 with members of red-spotted grouper nervous necrosis virus(RGNNV).The qNNV_Rl primer set(R1_F and R1_R) and the qNNV_R2 primer set(R2_F and R2_R) revealed 93%primer efficiency(regression:y=-0.2861 x + 9.9401,R^2= 0.9976)and the revealed 108%primer efficiency(regression:y=-0.3172 x + 10.0611,R^2= 0.9982),*** comparison with viral infectivity calculated by TCID_(50) method showed similar kinetic pattern at in vitro and NNV challenged fish(in vivo) ***:Result show that this method is rapid and efficient to diagnose NNV infection compare to traditional bioassay method(TCID_(50)).

关键词： Nervous necrosis virus(NNV) Quantitative detection Diagnostic Sevenband grouper

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Noninvasive Parameters and hepatic fibrosis scores in children with nonalcoholic fatty liver disease

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World Journal of Gastroenterology 2012年第13期18卷 1525-1530页

作者： Hye Ran Yang Hae Ryoung kim myung Jin kim jae Sung Ko Jeong Kee Seo Department of Pediatrics Seoul National University College of MedicineSeoul 110-744South Korea Department of Pediatrics Seoul National University Bundang HospitalSeongnam-siGyonggi-do 463-707South Korea Department of Pathology Seoul National University Bundang HospitalSeongnam-siGyonggi-do 464-894 South Korea

AIM:To evaluate the noninvasive parameters and hepatic fibrosis scores in obese children with nonalcoholic fatty liver disease(NAFLD).METHODS:A total of 77 children diagnosed with NAFLD via liver biopsy were included and divided into 2 subgroups according to the histopathologic staging of hepatic fibrosis:mild(stage 0-1)vs significant fibrosis(stage 2-4).Clinical and laboratory parameters were evaluated in each *** aspartate aminotransferase(AST)/alanine aminotransferase(ALT)ratio,AST/platelet ratio index(APRI),PGA index,Forns index,FIB-4,NAFLD fibrosis score,and pediatric NAFLD fibrosis index(PNFI)were ***:No clinical or biochemical parameter exhibited a significant difference between patients with mild and significant *** noninvasive hepatic fibrosis scores,only APRI and FIB4 revealed a significant difference between patients with mild and significant fibrosis(APRI:0.67±0.54 vs 0.78±0.38,P=0.032 and FIB4:0.24±0.12 vs 0.31±0.21,P=0.010).The area under the receiving operating characteristic curve of FIB4 was 0.81,followed by Forns index(0.73),APRI(0.70),NAFLD fibrosis score(0.58),AST/ALT ratio(0.53),PGA score(0.45),and PNFI(0.41).CONCLUSION:APRI and FIB4 might be useful noninvasive hepatic fibrosis scores for predicting hepatic fibrosis in children with NAFLD.

关键词： Fatty liver Hepatic fibrosis Noninvasive Obesity Child

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Simultaneous emission of orthogonal handedness in circular polarization from a single luminophore

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Light(Science & Applications) 2019年第1期8卷 39-46页

作者： Kyungmin Baek Dong-myung Lee Yu-Jin Lee Hyunchul Choi Jeongdae Seo Inbyeong Kang Chang-jae Yu jae-Hoon kim Department of Electronic Engineering Hanyang University222 WangsimniroSeongdong-guSeoul 04763Republic of Korea LG Display Co. Ltd.LG Science Park30 Magokjungang 10-roGangseo-guSeoul 07796Republic of Korea

The direct emission of circularly polarized(CP)light improves the efficiency of an organic light-emitting diode and characterizes the secondary structure of *** most cases,CP light is generated from a luminescent layer containing chiral characteristics,thereby generating only one kind of CP light in an entire ***,we propose direct CP light emissions using a twisted achiral conjugate polymer without any chiral dopant as an emitting layer(EML).The twisted structure is induced in the mesogenic conjugate polymer due to its elasticity by applying different alignment directions to its upper and lower ***,we demonstrate the simultaneous emission of orthogonal CP light in a single luminescent device by patterning different alignment directions on the surfaces of the *** light source with multipolarization including the orthogonal CP states is applicable to many applications in biosensors and optical devices.

关键词： circular twisted chiral

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Expert recommendation system based on analyzing expertise and networks of human resources in National Science & Technology Information Service

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Journal of Central South University 2013年第8期20卷 2212-2218页

作者： YANG myung-seok KANG Nam-kyu kim Yun-jeong kim jae-soo CHOI Kwang-nam kim Young-kuk NTIS Center Korea Institute of Science and Technology Information Department Of Computer Science and Engineering Chungnam National University

This work aims to implement expert and collaborative group recommendation services through an analysis of expertise and network relations NTIS. First of all, expertise database has been constructed by extracting keywords after indexing national R＆D information in Korea （human resources, project and outcome） and applying expertise calculation algorithm. In consideration of the characteristics of national R＆D information, weight values have been selected. Then, expertise points were calculated by applying weighted values. In addition, joint research and collaborative relations were implemented in a knowledge map format through network analysis using national R＆D information.

关键词： human networks network analysis NTIS R&D information

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