[Objective] The research aimed to study the reproductive health of breed- ing bull after infecting Mycoplasma wenyoniL [Method] The blood and semen quality of breeding bull before and after drug treatment was studied ...[Objective] The research aimed to study the reproductive health of breed- ing bull after infecting Mycoplasma wenyoniL [Method] The blood and semen quality of breeding bull before and after drug treatment was studied by the methods of blood routine examination and breeding soundness examination （BSE）. [Result] Be- fore the treatment with primaquine phosphate, slight anaemia was seen in diseased bull and a lot of M.wenyonfi were seen on blood smears. The scrotal wall of dis- eased bull swelled, testis was softened, the semen quality was reduced, semen quality was decreased and the proportion of primary and secondary deformed sperms was increased. After drug treatment, M.wenyonfi quickly disappeared from blood and the clinical systems were gradually alleviated, so BSE of breeding bulls after one month was passed. [Conclusion] The research laid the foundation for fur- ther study on the relationship between M.wenyonfi and the reduction of bull＇s repro- ductive functions.展开更多
The results of investigation to assess the possibility of copper slag with high MgO to be used as a mineral admixture in concrete were reported in this study. The soundness of cement paste containing the slag has been...The results of investigation to assess the possibility of copper slag with high MgO to be used as a mineral admixture in concrete were reported in this study. The soundness of cement paste containing the slag has been examined by autoclave test. Pozzolanic activity of the slag was studied in comparison to fly ash. The slag was mixed calcium hydroxide and water,and the progress of the pozzolanic reaction was determined by X-ray diffraction,differential thermal analysis-thermogravimetry and scanning electron microscopy from 28 to 90 d. The experimental results showed that the autoclave expansion value of cement paste containing the slag was far below the expansion limit (0.8%). It can be conclude that the slag has little periclase content. The consumption of calcium hydroxide showed the slag exhibits high pozzolanic activity,which was higher than that of fly ash. Hence,use of the copper slag with high MgO but low periclase content as a mineral admixture in concrete seems feasible.展开更多
Workflow management systems are widely used in improving the efficiency of business processes. To develop a workflow management system is the key to workflow modeling. In this paper, the compositional time net is pres...Workflow management systems are widely used in improving the efficiency of business processes. To develop a workflow management system is the key to workflow modeling. In this paper, the compositional time net is presented to model workflow processes on the basis of the analyzing methods of time Petri nets and workflows, and to describe the static relationships and the dynamic semantics of the task of multiple workflow com- position. The paper puts more emphasis on checking the sotmdness of composed workflow, at the same time, combinational problems of non-conditional structure of the compositional time net are introduced and analyzed. A sufficient and necessary condition for determining the soundness of compositional nets is obtained.展开更多
The physical and chemical properties and soundness of Baosteel Power Plant＇ s dry desulphurized fly ash were systematically investigated and compared with those of the similar byproducts produced by some other domest...The physical and chemical properties and soundness of Baosteel Power Plant＇ s dry desulphurized fly ash were systematically investigated and compared with those of the similar byproducts produced by some other domestic power plants. The feasibility of these byproducts used as a construction material was also analyzed. The results show that Baosteel＇s dry desulphurized fly ash is a kind of ash with high calcium and high sulfur contents, which has the characteristics of volcanic ash activity. It contains sulfate and sulfite, and is easy to cause sulfate activation. It has higher activity compared with common fly ash. But higher calcium sulfite and free-CaO contents in ash will bring about soundness concerns to users. Therefore, quality tests and volume control will be necessary when fly ash is used as a construction material.展开更多
Ⅰ. INTRODUCTIONThis note presents the semantic interpretation of predicate calculus system withequality symbol "=" of medium logic M E~* and its Soundness, Completeness, and Compact Theorem. In view of the ...Ⅰ. INTRODUCTIONThis note presents the semantic interpretation of predicate calculus system withequality symbol "=" of medium logic M E~* and its Soundness, Completeness, and Compact Theorem. In view of the characteristic of M E~*, when we construct展开更多
Kapur and Musser studied the theoretical basis for proof by consistency and ob-tained an inductive completeness result: p q if and only if p = q is true in everyinductive model. However, there is a loophole in their p...Kapur and Musser studied the theoretical basis for proof by consistency and ob-tained an inductive completeness result: p q if and only if p = q is true in everyinductive model. However, there is a loophole in their proof for the soundness part:p = q implies p = q is true in every inductive model. The aim of this paper is to give acorrect characterization of inductive soundness from an algebraic view by introducingstrong inductive models.展开更多
China’s annual Central Economic Work Conference, which ended in Beijing on December 7, emphasized that the country should give priority to the soundness of economic operations instead of the growth rate in the future...China’s annual Central Economic Work Conference, which ended in Beijing on December 7, emphasized that the country should give priority to the soundness of economic operations instead of the growth rate in the future. Comparing the quality-first approach with the previous focus on GDP growth, a Xinhua News Agency commentary hails the adjustment as a significant change in the development strategy of the country.展开更多
The active sound absorption technique excels in mitigating low-frequency sound waves,yet it falls short when dealing with medium and high-frequency sound waves.To enhance the sound-absorbing effect of medium and high-...The active sound absorption technique excels in mitigating low-frequency sound waves,yet it falls short when dealing with medium and high-frequency sound waves.To enhance the sound-absorbing effect of medium and high-frequency sound waves,a novel semi-active sound absorption method has been introduced.This method modulates the surface impedance of a loudspeaker positioned behind the sound-absorbing material,thereby altering the sound absorption coefficient.The theoretical sound absorption coefficient is calculated using MATLAB and compared with the experimental one.Results show that the method can effectively modulates the absorption coefficient in response to varying incident sound wave frequencies,ensuring that it remains at its peak value.展开更多
Metal foams are a fascinating group of materials that possess distinct physicochEMIcal properties and interconnected strut features with high surface area-to-volume ratios, high specific strength and lightweight natur...Metal foams are a fascinating group of materials that possess distinct physicochEMIcal properties and interconnected strut features with high surface area-to-volume ratios, high specific strength and lightweight nature. These characteristics make them ideal for applications in vibration damping, heat insulation and weight reduction. In recent years, there has been increasing interest in the application of interfering energy conversion such as electromagnetic wave (EMW) and sound, where the metal foams could emerge as a solution. This paper will present a comprehensive review of the preparation methods as well as the interference energy converting mechanisms for metal foams. Typically, the progress and prospective aspects of metal foams for EMW absorption, electromagnetic interference (EMI) shielding and sound absorption have been emphasized. Through this review, we aspire to offer valuable insights for the development of multifunctional applications with metal foam materials.展开更多
Ultrasound computed tomography(USCT)is a noninvasive biomedical imaging modality that offers insights into acoustic properties such as the sound speed(SS)and acoustic attenuation(AA)of the human body,enhancing diagnos...Ultrasound computed tomography(USCT)is a noninvasive biomedical imaging modality that offers insights into acoustic properties such as the sound speed(SS)and acoustic attenuation(AA)of the human body,enhancing diagnostic accuracy and therapy planning.Full waveform inversion(FWI)is a promising USCT image reconstruction method that optimizes the parameter fields of a wave propagation model via gradient-based optimization.However,twodimensional FWI methods are limited by their inability to account for three-dimensional wave propagation in the elevation direction,resulting in image artifacts.To address this problem,we propose a three-dimensional time-domain full waveform inversion algorithm to reconstruct the SS and AA distributions on the basis of a fractional Laplacian wave equation,adjoint field formulation,and gradient descent optimization.Validated by two sets of simulations,the proposed algorithm has potential for generating high-resolution and quantitative SS and AA distributions.This approach holds promise for clinical USCT applications,assisting early disease detection,precise abnormality localization,and optimized treatment planning,thus contributing to better healthcare outcomes.展开更多
Objective:To explore the research landscape and hotspots of Computerized Respiratory Sound Analysis(CORSA)and provide a reference for future in-depth studies.Methods:Literature related to CORSA published up to August ...Objective:To explore the research landscape and hotspots of Computerized Respiratory Sound Analysis(CORSA)and provide a reference for future in-depth studies.Methods:Literature related to CORSA published up to August 27,2020,was retrieved from the Web of Science Core Collection.CiteSpace 5.6.R3 was used to perform co-authorship analysis,institutional collaboration analysis,keyword co-occurrence analysis,and co-citation analysis.Results:A total of 1,897 publications were included.Co-authorship analysis identified several influential contributors,including Zahra Moussavi,Kenneth Sundaraj,and H.Pasterkamp.Major research institutions included the University of Manitoba,the University of Queensland,and Aristotle University of Thessaloniki.Keyword co-occurrence analysis indicated that“respiratory sound,”“lung sound,”“asthma,”“children,”and“classification”were major research themes.The most frequently co-cited articles were published by Arati Gurung(2011),Mohammed Bahoura(2009),and H.Pasterkamp(1997).Highly cited journals included Chest,the American Journal of Respiratory and Critical Care Medicine,and IEEE Transactions on Biomedical Engineering.Conclusion:CORSA research is primarily driven by European and North American scholars and institutions,with China still in an early stage of development.Current hotspots include respiratory sound acquisition and processing,feature extraction methods such as Mel-frequency cepstral coefficients(MFCCs),and classification techniques based on machine learning and deep learning.CORSA is suitable for diverse populations and is widely applied in respiratory diseases,especially bronchial asthma.Its non-invasive nature offers particular advantages for infants and pregnant women.Although CORSA demonstrates strong clinical potential,its clinical translation remains limited.Advancing clinical applications and bridging the gap between research and practice will be key directions for future development.The prominence of top-tier respiratory and engineering journals among citations suggests that CORSA is an emerging and influential research frontier.展开更多
To the editor:The superior semicircular canal dehiscence was first described by Minor et all in 1998 as a condition in which the superior semicircular canal lacks a bony covering and has gained constantly increasing i...To the editor:The superior semicircular canal dehiscence was first described by Minor et all in 1998 as a condition in which the superior semicircular canal lacks a bony covering and has gained constantly increasing interest since its discovery.2 The symptoms are varied but specific what is known as Minor syndrome or‘third mobile window’syndrome,'as patients may experience autophony with abnormally loud sounds like footsteps,chewing,breathing,eye movement,echoing voice,distortion of environmental sounds and pulsatile tinnitus.展开更多
一、单词拼写1.Light travels much faster than___(声音).2.It's______(容易的)for us to pay online with Alipay now,3.The teacher often____(测试)his students in math.4.At that time,things could be_____(困难的)for the w...一、单词拼写1.Light travels much faster than___(声音).2.It's______(容易的)for us to pay online with Alipay now,3.The teacher often____(测试)his students in math.4.At that time,things could be_____(困难的)for the workers.5.It's said that she's__(储备)nearly one ton of potatoes at home.6.In his spare time,Dr.Yuan loves playing the piano and listening to__(音乐),especially Mozart's.展开更多
The emerging millimeter-wave microphones have garnered considerable attention in recent years due to their potential for sound detection in various applications,particularly in situations where traditional microphones...The emerging millimeter-wave microphones have garnered considerable attention in recent years due to their potential for sound detection in various applications,particularly in situations where traditional microphones may be impractical.However,despite their promise,there is a notable lack of evidence demonstrating high-quality sound recovery of moving sources,which remains a significant challenge in thefield.This paper addresses this critical gap by proposing a novel method for displacement alignment that improves the detection and recovery of sound signals from moving sources.The proposed method works byfirst aligning the displacement of the sound source over time,which ensures that the signals are synchronized and avoids interference from movement of sources.Subsequently,precise surface vibrations are extracted from the aligned signals,providing data for sound recovery.Afinite impulse response(FIR)filter is applied to remove low-frequency motion,which often interferes with the clarity of the detected sound.Experimental results demonstrate the method’s effectiveness in recovering high-quality sound from moving sources,offering a promising solution for advancing the emerging millimeter-wave microphone technology in real-world applications.This work could pave the way for more accurate and reliable sound detection systems,particularly in dynamic environments.展开更多
The classification of respiratory sounds is crucial in diagnosing and monitoring respiratory diseases.However,auscultation is highly subjective,making it challenging to analyze respiratory sounds accurately.Although d...The classification of respiratory sounds is crucial in diagnosing and monitoring respiratory diseases.However,auscultation is highly subjective,making it challenging to analyze respiratory sounds accurately.Although deep learning has been increasingly applied to this task,most existing approaches have primarily relied on supervised learning.Since supervised learning requires large amounts of labeled data,recent studies have explored self-supervised and semi-supervised methods to overcome this limitation.However,these approaches have largely assumed a closedset setting,where the classes present in the unlabeled data are considered identical to those in the labeled data.In contrast,this study explores an open-set semi-supervised learning setting,where the unlabeled data may contain additional,unknown classes.To address this challenge,a distance-based prototype network is employed to classify respiratory sounds in an open-set setting.In the first stage,the prototype network is trained using labeled and unlabeled data to derive prototype representations of known classes.In the second stage,distances between unlabeled data and known class prototypes are computed,and samples exceeding an adaptive threshold are identified as unknown.A new prototype is then calculated for this unknown class.In the final stage,semi-supervised learning is employed to classify labeled and unlabeled data into known and unknown classes.Compared to conventional closed-set semisupervised learning approaches,the proposed method achieved an average classification accuracy improvement of 2%–5%.Additionally,in cases of data scarcity,utilizing unlabeled data further improved classification performance by 6%–8%.The findings of this study are expected to significantly enhance respiratory sound classification performance in practical clinical settings.展开更多
This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal...This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal and fixed at both ends.Through our procedure we experimentally find the first 9 Eigen frequencies(21 Hz,60 Hz,116 Hz...)and correlate them using the cantilever theory.展开更多
A centrifugal pump with a specific speed ns=67 is considered in this study to investigate the impact of blade cutting(at the outlet edge)on the fluid-induced noise,while keeping all the other geometric parameters unch...A centrifugal pump with a specific speed ns=67 is considered in this study to investigate the impact of blade cutting(at the outlet edge)on the fluid-induced noise,while keeping all the other geometric parameters unchanged.The required unsteady numerical calculations are conducted by applying the RNG k-εturbulence model with the volute dipole being used as the sound source.The results indicate that the internal pressure energy of the centrifugal pump essentially depends on the blade passing frequency and its low-frequency harmonic frequency.Moreover,the pressure pulsation distribution directly affects the noise caused by the centrifugal pump.The sound pressure inside and outside the centrifugal pump and the sound power at the blade passing frequency gradually decrease increasing cutting distance of the impeller blades.When the cutting percentage is 1.21%,that is,the clearance ratio between impeller blade and tongue is 8.57%,the comprehensive performance of the centrifugal pump is the best.展开更多
Passerine mimics often imitate various vocalizations from other bird species and incorporate these sounds into their song repertoires.While a few anecdotes reported that wild songbirds imitated human-associated sounds...Passerine mimics often imitate various vocalizations from other bird species and incorporate these sounds into their song repertoires.While a few anecdotes reported that wild songbirds imitated human-associated sounds,besides captive parrots and songbirds,systemic and quantitative studies on human-made sound mimicry in wild birds remain scarce.In this study,we investigated the mimetic accuracy and consistency of electric moped sounds imitated by an urban bird,the Chinese Blackbird(Turdus mandarinus).We found that:(1)Only one type of electric moped sound was imitated,i.e.,13 of 26 males mimicked the first part of the antitheft alarm,a phrase containing a series of identical notes.(2)The mimicry produced by male Chinese Blackbirds had fewer notes and lower consistency within phrases compared to the model alarms.(3)The mimicry of male Chinese Blackbirds was imperfect,i.e.,most of the acoustic parameters differed from the model alarms.Additionally,mimetic notes were lower in frequency than the models.Mimetic notes from two areas were also different in acoustic structures,suggesting Chinese Blackbirds might learn mimicry mainly from conspecific neighbors within each area respectively rather than electric mopeds,namely the secondary mimicry.Imperfect mimicry of human-made sounds could result from cost and physical constraints,associated with high consistency,frequency,and repetitions.Consequently,Chinese Blackbirds copied a simplified version of electric moped alarms.We recommend further attention to mimic species inhabiting urban ecosystems to better understand vocal mimicry's adaptation to ongoing urbanization.展开更多
A heart attack disrupts the normal flow of blood to the heart muscle,potentially causing severe damage or death if not treated promptly.It can lead to long-term health complications,reduce quality of life,and signific...A heart attack disrupts the normal flow of blood to the heart muscle,potentially causing severe damage or death if not treated promptly.It can lead to long-term health complications,reduce quality of life,and significantly impact daily activities and overall well-being.Despite the growing popularity of deep learning,several drawbacks persist,such as complexity and the limitation of single-model learning.In this paper,we introduce a residual learning-based feature fusion technique to achieve high accuracy in differentiating abnormal cardiac rhythms heart sound.Combining MobileNet with DenseNet201 for feature fusion leverages MobileNet lightweight,efficient architecture with DenseNet201,dense connections,resulting in enhanced feature extraction and improved model performance with reduced computational cost.To further enhance the fusion,we employed residual learning to optimize the hierarchical features of heart abnormal sounds during training.The experimental results demonstrate that the proposed fusion method achieved an accuracy of 95.67%on the benchmark PhysioNet-2016 Spectrogram dataset.To further validate the performance,we applied it to the BreakHis dataset with a magnification level of 100X.The results indicate that the model maintains robust performance on the second dataset,achieving an accuracy of 96.55%.it highlights its consistent performance,making it a suitable for various applications.展开更多
基金Supported by Spark Program of Ministry of Science and Technology(2012GA6200025)Science and Technology Development Plan Program in Shijiazhuang City(08150132A-3)Program of Qinhuangdao Science and Technology Bureau(200901A070)~~
文摘[Objective] The research aimed to study the reproductive health of breed- ing bull after infecting Mycoplasma wenyoniL [Method] The blood and semen quality of breeding bull before and after drug treatment was studied by the methods of blood routine examination and breeding soundness examination （BSE）. [Result] Be- fore the treatment with primaquine phosphate, slight anaemia was seen in diseased bull and a lot of M.wenyonfi were seen on blood smears. The scrotal wall of dis- eased bull swelled, testis was softened, the semen quality was reduced, semen quality was decreased and the proportion of primary and secondary deformed sperms was increased. After drug treatment, M.wenyonfi quickly disappeared from blood and the clinical systems were gradually alleviated, so BSE of breeding bulls after one month was passed. [Conclusion] The research laid the foundation for fur- ther study on the relationship between M.wenyonfi and the reduction of bull＇s repro- ductive functions.
文摘The results of investigation to assess the possibility of copper slag with high MgO to be used as a mineral admixture in concrete were reported in this study. The soundness of cement paste containing the slag has been examined by autoclave test. Pozzolanic activity of the slag was studied in comparison to fly ash. The slag was mixed calcium hydroxide and water,and the progress of the pozzolanic reaction was determined by X-ray diffraction,differential thermal analysis-thermogravimetry and scanning electron microscopy from 28 to 90 d. The experimental results showed that the autoclave expansion value of cement paste containing the slag was far below the expansion limit (0.8%). It can be conclude that the slag has little periclase content. The consumption of calcium hydroxide showed the slag exhibits high pozzolanic activity,which was higher than that of fly ash. Hence,use of the copper slag with high MgO but low periclase content as a mineral admixture in concrete seems feasible.
基金Supported by the National Natural Science Foundation of China (61103115)the Key Project of Guangdong and Hong Kong (2007A090601001)
文摘Workflow management systems are widely used in improving the efficiency of business processes. To develop a workflow management system is the key to workflow modeling. In this paper, the compositional time net is presented to model workflow processes on the basis of the analyzing methods of time Petri nets and workflows, and to describe the static relationships and the dynamic semantics of the task of multiple workflow com- position. The paper puts more emphasis on checking the sotmdness of composed workflow, at the same time, combinational problems of non-conditional structure of the compositional time net are introduced and analyzed. A sufficient and necessary condition for determining the soundness of compositional nets is obtained.
文摘The physical and chemical properties and soundness of Baosteel Power Plant＇ s dry desulphurized fly ash were systematically investigated and compared with those of the similar byproducts produced by some other domestic power plants. The feasibility of these byproducts used as a construction material was also analyzed. The results show that Baosteel＇s dry desulphurized fly ash is a kind of ash with high calcium and high sulfur contents, which has the characteristics of volcanic ash activity. It contains sulfate and sulfite, and is easy to cause sulfate activation. It has higher activity compared with common fly ash. But higher calcium sulfite and free-CaO contents in ash will bring about soundness concerns to users. Therefore, quality tests and volume control will be necessary when fly ash is used as a construction material.
文摘Ⅰ. INTRODUCTIONThis note presents the semantic interpretation of predicate calculus system withequality symbol "=" of medium logic M E~* and its Soundness, Completeness, and Compact Theorem. In view of the characteristic of M E~*, when we construct
文摘Kapur and Musser studied the theoretical basis for proof by consistency and ob-tained an inductive completeness result: p q if and only if p = q is true in everyinductive model. However, there is a loophole in their proof for the soundness part:p = q implies p = q is true in every inductive model. The aim of this paper is to give acorrect characterization of inductive soundness from an algebraic view by introducingstrong inductive models.
文摘China’s annual Central Economic Work Conference, which ended in Beijing on December 7, emphasized that the country should give priority to the soundness of economic operations instead of the growth rate in the future. Comparing the quality-first approach with the previous focus on GDP growth, a Xinhua News Agency commentary hails the adjustment as a significant change in the development strategy of the country.
基金National Natural Science Foundation of China(No.51705545)。
文摘The active sound absorption technique excels in mitigating low-frequency sound waves,yet it falls short when dealing with medium and high-frequency sound waves.To enhance the sound-absorbing effect of medium and high-frequency sound waves,a novel semi-active sound absorption method has been introduced.This method modulates the surface impedance of a loudspeaker positioned behind the sound-absorbing material,thereby altering the sound absorption coefficient.The theoretical sound absorption coefficient is calculated using MATLAB and compared with the experimental one.Results show that the method can effectively modulates the absorption coefficient in response to varying incident sound wave frequencies,ensuring that it remains at its peak value.
基金supported by the National Natural Science Foundation of China(No.52271180)the Leading Goose R&D Program of Zhejiang Province(2022C01110).
文摘Metal foams are a fascinating group of materials that possess distinct physicochEMIcal properties and interconnected strut features with high surface area-to-volume ratios, high specific strength and lightweight nature. These characteristics make them ideal for applications in vibration damping, heat insulation and weight reduction. In recent years, there has been increasing interest in the application of interfering energy conversion such as electromagnetic wave (EMW) and sound, where the metal foams could emerge as a solution. This paper will present a comprehensive review of the preparation methods as well as the interference energy converting mechanisms for metal foams. Typically, the progress and prospective aspects of metal foams for EMW absorption, electromagnetic interference (EMI) shielding and sound absorption have been emphasized. Through this review, we aspire to offer valuable insights for the development of multifunctional applications with metal foam materials.
基金supported by the National Key Research and Development Program of China(2022YFA1404400)the National Natural Science Foundation of China(62122072,12174368,61705216,62405306)+4 种基金Anhui Provincial Department of Science and Technology(202203a07020020,18030801138)Anhui Provincial Natural Science Foundation(2308085QA21,2408085QF187)the USTC Research Funds of the Double First-Class Initiative(YD2090002015)the Institute of Artificial Intelligence at Hefei Comprehensive National Science Center(23YGXT005)the Fundamental Research Funds for the Central Universities(WK2090000083).
文摘Ultrasound computed tomography(USCT)is a noninvasive biomedical imaging modality that offers insights into acoustic properties such as the sound speed(SS)and acoustic attenuation(AA)of the human body,enhancing diagnostic accuracy and therapy planning.Full waveform inversion(FWI)is a promising USCT image reconstruction method that optimizes the parameter fields of a wave propagation model via gradient-based optimization.However,twodimensional FWI methods are limited by their inability to account for three-dimensional wave propagation in the elevation direction,resulting in image artifacts.To address this problem,we propose a three-dimensional time-domain full waveform inversion algorithm to reconstruct the SS and AA distributions on the basis of a fractional Laplacian wave equation,adjoint field formulation,and gradient descent optimization.Validated by two sets of simulations,the proposed algorithm has potential for generating high-resolution and quantitative SS and AA distributions.This approach holds promise for clinical USCT applications,assisting early disease detection,precise abnormality localization,and optimized treatment planning,thus contributing to better healthcare outcomes.
基金Beijing Hospitals Authority Clinical Medicine Development of Special Funding Support,Code(Project No.:YGLX202514)。
文摘Objective:To explore the research landscape and hotspots of Computerized Respiratory Sound Analysis(CORSA)and provide a reference for future in-depth studies.Methods:Literature related to CORSA published up to August 27,2020,was retrieved from the Web of Science Core Collection.CiteSpace 5.6.R3 was used to perform co-authorship analysis,institutional collaboration analysis,keyword co-occurrence analysis,and co-citation analysis.Results:A total of 1,897 publications were included.Co-authorship analysis identified several influential contributors,including Zahra Moussavi,Kenneth Sundaraj,and H.Pasterkamp.Major research institutions included the University of Manitoba,the University of Queensland,and Aristotle University of Thessaloniki.Keyword co-occurrence analysis indicated that“respiratory sound,”“lung sound,”“asthma,”“children,”and“classification”were major research themes.The most frequently co-cited articles were published by Arati Gurung(2011),Mohammed Bahoura(2009),and H.Pasterkamp(1997).Highly cited journals included Chest,the American Journal of Respiratory and Critical Care Medicine,and IEEE Transactions on Biomedical Engineering.Conclusion:CORSA research is primarily driven by European and North American scholars and institutions,with China still in an early stage of development.Current hotspots include respiratory sound acquisition and processing,feature extraction methods such as Mel-frequency cepstral coefficients(MFCCs),and classification techniques based on machine learning and deep learning.CORSA is suitable for diverse populations and is widely applied in respiratory diseases,especially bronchial asthma.Its non-invasive nature offers particular advantages for infants and pregnant women.Although CORSA demonstrates strong clinical potential,its clinical translation remains limited.Advancing clinical applications and bridging the gap between research and practice will be key directions for future development.The prominence of top-tier respiratory and engineering journals among citations suggests that CORSA is an emerging and influential research frontier.
文摘To the editor:The superior semicircular canal dehiscence was first described by Minor et all in 1998 as a condition in which the superior semicircular canal lacks a bony covering and has gained constantly increasing interest since its discovery.2 The symptoms are varied but specific what is known as Minor syndrome or‘third mobile window’syndrome,'as patients may experience autophony with abnormally loud sounds like footsteps,chewing,breathing,eye movement,echoing voice,distortion of environmental sounds and pulsatile tinnitus.
文摘一、单词拼写1.Light travels much faster than___(声音).2.It's______(容易的)for us to pay online with Alipay now,3.The teacher often____(测试)his students in math.4.At that time,things could be_____(困难的)for the workers.5.It's said that she's__(储备)nearly one ton of potatoes at home.6.In his spare time,Dr.Yuan loves playing the piano and listening to__(音乐),especially Mozart's.
基金supported by the National Natural Science Foundation of China under Grant No.51905341the Natural Science Foundation of Shanghai under Grant 22ZR1433900.
文摘The emerging millimeter-wave microphones have garnered considerable attention in recent years due to their potential for sound detection in various applications,particularly in situations where traditional microphones may be impractical.However,despite their promise,there is a notable lack of evidence demonstrating high-quality sound recovery of moving sources,which remains a significant challenge in thefield.This paper addresses this critical gap by proposing a novel method for displacement alignment that improves the detection and recovery of sound signals from moving sources.The proposed method works byfirst aligning the displacement of the sound source over time,which ensures that the signals are synchronized and avoids interference from movement of sources.Subsequently,precise surface vibrations are extracted from the aligned signals,providing data for sound recovery.Afinite impulse response(FIR)filter is applied to remove low-frequency motion,which often interferes with the clarity of the detected sound.Experimental results demonstrate the method’s effectiveness in recovering high-quality sound from moving sources,offering a promising solution for advancing the emerging millimeter-wave microphone technology in real-world applications.This work could pave the way for more accurate and reliable sound detection systems,particularly in dynamic environments.
基金supported by Innovative Human Resource Development for Local Intellectualization Programthrough the Institute of Information&Communications Technology Planning&Evaluation(IITP)grant funded by the Korea government(MSIT)(IITP-2025-RS-2022-00156360).
文摘The classification of respiratory sounds is crucial in diagnosing and monitoring respiratory diseases.However,auscultation is highly subjective,making it challenging to analyze respiratory sounds accurately.Although deep learning has been increasingly applied to this task,most existing approaches have primarily relied on supervised learning.Since supervised learning requires large amounts of labeled data,recent studies have explored self-supervised and semi-supervised methods to overcome this limitation.However,these approaches have largely assumed a closedset setting,where the classes present in the unlabeled data are considered identical to those in the labeled data.In contrast,this study explores an open-set semi-supervised learning setting,where the unlabeled data may contain additional,unknown classes.To address this challenge,a distance-based prototype network is employed to classify respiratory sounds in an open-set setting.In the first stage,the prototype network is trained using labeled and unlabeled data to derive prototype representations of known classes.In the second stage,distances between unlabeled data and known class prototypes are computed,and samples exceeding an adaptive threshold are identified as unknown.A new prototype is then calculated for this unknown class.In the final stage,semi-supervised learning is employed to classify labeled and unlabeled data into known and unknown classes.Compared to conventional closed-set semisupervised learning approaches,the proposed method achieved an average classification accuracy improvement of 2%–5%.Additionally,in cases of data scarcity,utilizing unlabeled data further improved classification performance by 6%–8%.The findings of this study are expected to significantly enhance respiratory sound classification performance in practical clinical settings.
文摘This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal and fixed at both ends.Through our procedure we experimentally find the first 9 Eigen frequencies(21 Hz,60 Hz,116 Hz...)and correlate them using the cantilever theory.
文摘A centrifugal pump with a specific speed ns=67 is considered in this study to investigate the impact of blade cutting(at the outlet edge)on the fluid-induced noise,while keeping all the other geometric parameters unchanged.The required unsteady numerical calculations are conducted by applying the RNG k-εturbulence model with the volute dipole being used as the sound source.The results indicate that the internal pressure energy of the centrifugal pump essentially depends on the blade passing frequency and its low-frequency harmonic frequency.Moreover,the pressure pulsation distribution directly affects the noise caused by the centrifugal pump.The sound pressure inside and outside the centrifugal pump and the sound power at the blade passing frequency gradually decrease increasing cutting distance of the impeller blades.When the cutting percentage is 1.21%,that is,the clearance ratio between impeller blade and tongue is 8.57%,the comprehensive performance of the centrifugal pump is the best.
基金supported by the National Key Research and Development Program of China(2022YFC3202104)the Western LightKey Laboratory Cooperative Research Cross-Team Project of Chinese Academy of Sciences(xbzg-zdsys-202207)。
文摘Passerine mimics often imitate various vocalizations from other bird species and incorporate these sounds into their song repertoires.While a few anecdotes reported that wild songbirds imitated human-associated sounds,besides captive parrots and songbirds,systemic and quantitative studies on human-made sound mimicry in wild birds remain scarce.In this study,we investigated the mimetic accuracy and consistency of electric moped sounds imitated by an urban bird,the Chinese Blackbird(Turdus mandarinus).We found that:(1)Only one type of electric moped sound was imitated,i.e.,13 of 26 males mimicked the first part of the antitheft alarm,a phrase containing a series of identical notes.(2)The mimicry produced by male Chinese Blackbirds had fewer notes and lower consistency within phrases compared to the model alarms.(3)The mimicry of male Chinese Blackbirds was imperfect,i.e.,most of the acoustic parameters differed from the model alarms.Additionally,mimetic notes were lower in frequency than the models.Mimetic notes from two areas were also different in acoustic structures,suggesting Chinese Blackbirds might learn mimicry mainly from conspecific neighbors within each area respectively rather than electric mopeds,namely the secondary mimicry.Imperfect mimicry of human-made sounds could result from cost and physical constraints,associated with high consistency,frequency,and repetitions.Consequently,Chinese Blackbirds copied a simplified version of electric moped alarms.We recommend further attention to mimic species inhabiting urban ecosystems to better understand vocal mimicry's adaptation to ongoing urbanization.
文摘A heart attack disrupts the normal flow of blood to the heart muscle,potentially causing severe damage or death if not treated promptly.It can lead to long-term health complications,reduce quality of life,and significantly impact daily activities and overall well-being.Despite the growing popularity of deep learning,several drawbacks persist,such as complexity and the limitation of single-model learning.In this paper,we introduce a residual learning-based feature fusion technique to achieve high accuracy in differentiating abnormal cardiac rhythms heart sound.Combining MobileNet with DenseNet201 for feature fusion leverages MobileNet lightweight,efficient architecture with DenseNet201,dense connections,resulting in enhanced feature extraction and improved model performance with reduced computational cost.To further enhance the fusion,we employed residual learning to optimize the hierarchical features of heart abnormal sounds during training.The experimental results demonstrate that the proposed fusion method achieved an accuracy of 95.67%on the benchmark PhysioNet-2016 Spectrogram dataset.To further validate the performance,we applied it to the BreakHis dataset with a magnification level of 100X.The results indicate that the model maintains robust performance on the second dataset,achieving an accuracy of 96.55%.it highlights its consistent performance,making it a suitable for various applications.
