检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

噪声声品质主观评价研究中数据分析的新特点

声学技术 2005年第z1期24卷 107-108页

作者：焦风雷刘克毛东兴中国科学院声学研究所北京100080 中国科学院声学研究所北京100080 同济大学声学研究所上海200092

　　1引言　　噪声声品质研究是环境声学中一项新的研究领域,起源于当声压级下降到一定程度,A声级及1/3倍频程不能反映人们对于噪声声品质的评价[1].噪声声品质评价主观性较强,因此主观实验评价研究起着重要的作用,可通过对于第一手实... 详细信息

　　1引言　　噪声声品质研究是环境声学中一项新的研究领域,起源于当声压级下降到一定程度,A声级及1/3倍频程不能反映人们对于噪声声品质的评价[1].噪声声品质评价主观性较强,因此主观实验评价研究起着重要的作用,可通过对于第一手实验数据的科学分析和合理分析,将人们对于噪声声品质的主观感知属性进行量化,从而直接获得人们对于噪声信号的主观感知反映属性[2].　　……

关键词：噪声声品质评价研究数据分析 subjective assessment 主观感知属性质的评价噪声信号研究领域实验数据品质研究品质评价科学分析环境声学合理分析主观性声压级倍频程声级起源

Statistical Inference of User Experience of Multichannel Audio on Mobile Phones

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2020年第11期65卷 1253-1270页

作者： Fesal Toosy Muhammad Sarwar Ehsan University of Central Punjab Lahore54700Pakistan

Mobile phones and other handheld electronic devices are now ubiquitous and play an important role in our everyday *** the last decade,we have seen a sharp rise in the sophistication of both hardware and software for these devices,thus significantly increasing their utility and *** devices are now commonly used for the streaming of audio and video and for the regular playback of *** audio has now become a popular format and with recent updates in software,the latest audio codecs that support this format can effectively be played back on most electronic *** a result,more audio content that is now compatible with these devices is being *** is important to perform subjective quality tests for multichannel audio verses traditional stereo and mono on devices like mobile phones while using *** paper presents the results and analysis of such listening tests that evaluate basic audio quality and quality of *** results show that while multichannel audio scores higher than stereo and mono for both of these attributes,the difference in score was less for the ratings of quality of *** results were processed using an Analysis of Variance(ANOVA)to show the statistical *** of the effect size showed that the audio content had little bearing on the results.

关键词： subjective assessment multichannel audio MUSHRA listening test

Emotional evaluation of lighting in university classrooms:A preliminary study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2018年第4期7卷 600-609页

作者： Nuria Castilla Carmen Llinares Fabio Bisegna Vicente Blanca-Gimenez Dpto.Construcciones Arquitectonicas Universitat Politecnica de ValenciaCamino de Veras/nValencia 46022Spain Instituto de Investigacion e Innovacion en Bioingenieria i3BUniversitat Politecnica de ValenciaCamina de Veras/nValencia 46022Spain Dept.of Astronautical Electrical and Energetic Engineering (DIAEE)SAPIENZA University of RomeVia Eudossiana 18Rome 00184Italy

In educational environments an improvement in the quality of interior lighting has a direct benefit in increasing productivity and alertness of students and teachers, as well as very important implications for the energy efficiency of the education facilities but when a replacement with different lighting is analyzed, research may be tarnished by users' preformed opinions, influenced by manufacturers and advertising. Consequently, it is necessary to understand the users' point of view, even before of being subjected to any change in the lighting stimulus. Based on the Kansei Engineering framework, the general objective of this paper is to evaluate and compare the subjective evaluation of students' pre-formed opinions to lighting provided by two types of lamps (fluorescent and LED). The subjective assessment of 427 university students has been compared over four years. The results show significant differences in students' subjective evaluation. This finding highlights the existence of symbolic or functional attributes of the usefulness perceived by the student that could influence on investigations in which different types of lighting are compared. (C) 2018 Higher Education Press Limited Company. Production and hosting by Elsevier B.V. on behalf of KeAi.

关键词： Kansei engineering Lighting Fluorescent LED subjective assessment University classroom

Reliability assessment and correlation analysis of evaluating orthodontic treatment outcome in Chinese patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Oral Science 2014年第1期6卷 50-55页

作者： Guang-Ying Song Zhi-He Zhao Yin Ding Yu-Xing Bai Lin Wang Hong He Gang Shen Wei-Ran Li Sheldon Baumrind Zhi Geng Tian-Min Xu Department of Orthodontics School and Hospital of Stomatology Peking University State Key Laboratory of Oral Diseases Department of Orthodontics West China Hospital of Stomatology Sichuan University Department of Orthodontics School of Stomatology Fourth Military Medical University Department of Orthodontics School of Stomatology Capital Medical University Department of Orthodontics Institute of Stomatology Nanjing Medical University Department of Orthodontics School and Hospital of Stomatology Wuhan University Key Laboratory for Oral Biomedical Engineering Wuhan University Department of Orthodontics School of Stomatology Shanghai Jiao Tong University Department of Orthodontics School of Dentistry University of the Pacific School of Mathematical Sciences Peking University

This study aimed to assess the reliability of experienced Chinese orthodontists in evaluating treatment outcome and to determine the correlations between three diagnostic information sources. Sixty-nine experienced Chinese orthodontic specialists each evaluated the outcome of orthodontic treatment of 108 Chinese patients. Three different information sources： study casts （SC）, lateral cephalometric X-ray images （LX） and facial photographs （PH） were generated at the end of treatment for 108 patients selected randomly from six orthodontic treatment centers throughout China. Six different assessments of treatment outcome were made by each orthodontist using data from the three information sources separately and in combination. Each assessment included both ranking and grading for each patient. The rankings of each of the 69 judges for the 108 patients were correlated with the rankings of each of the other judges yielding 13 873 Spearman rs values, ranging from -0.08 to ＋0.85. Of these, 90% were greater than 0.4, showing moderate-to-high consistency among the 69 orthodontists. In the combined evaluations, study casts were the most significant predictive component （R2=0.86, P〈0.000 1）, while the inclusion of lateral cephalometric films and facial photographs also contributed to a more comprehensive assessment （R2=0.96, P〈0.000 1）. Grading scores for SC＋LX and SC＋PH were highly significantly correlated with those for SC＋LX＋PH （r（SC＋LX）vs.（SC＋LX＋PH）=0.96, r（SC＋PH）vs.（SC＋LX＋PH）=0.97）, showing that either SC＋LX or SC＋PH is an excellent substitute for all three combined assessment,

关键词： correlation analysis orthodontic treatment outcome reliability subjective assessment

Applicability of nonmetric multidimensional scaling to noise quality research

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 2006年第3期25卷 277-288页

作者： JIAO Fenglei CHEN Yaobin JIANG Jian GU Fengshou Andrew BALL MAO Dongxing Institute of Acoustics Chinese Academy of Sciences Beijing 100080 Manchester School of Engineering University of Manchester Manchester M139PL UK Institute of Acoustics Tongji University Shanghai 200092

With loudness-equalized car interior noise as sound stimuli, the work focused on apphcabihty of nonmetric multidimensional scaling （NMDS） to sound quality research. It is presented that NMDS is an effective tool for subjective assessment research of sound quality, when listeners are clustered through correlation between hsteners. With this key clustering process, the perceptual structure of car interior noise with strong consistency is revealed. The results shown that： for car interior noise, ‘preference＇ can be regarded as a main sub-dimension in ‘similarity＇ space and listeners could be divided into two groups; For both groups of listeners, the perceptual ‘preference＇ can be characterized as one-dimensional descriptor, with one group has a positive relation to ‘low-frequency＇, while another group has a negative relation to ‘low- frequency＇.

关键词： subjective assessment strong consistency clustering process

A NEW IMAGE QUALITY assessment BASED ON HVS

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2005年第3期22卷 315-320页

作者： DuJuan YuYinglin XieShengli SchoolofElectronicandInfo.Eng. SouthChinaUniv.ofTech.Guangzhou510640China

This letter proposes a new kind of image quality philosophy—Modulate Quality based on Fixation Points (MQFP) based on Human Visual System (HVS) model. Dissimilar to the former HVS-based quality assessment, the new measure emphasizes particularly on modeling the jumping phenomenon of human sight instead of modeling the visual perception of human. In other words, to model the HVS using fixation points and stay-frequency instead of Contrast Sensitive Function (CSF) etc. which models the visual perception of HVS. The experiment on various frequency-distortion images indicates that the new measure is correlated with the subjective judgment more than the former HVS-based measure and is a robust measure.

关键词： Quality assessment Human Visual System (HVS) Fixation points subjective assessment

Return to Sports after Lower Extremity Injuries:assessment of Movement Quality

在线全文

学校读者我要写书评

暂无评论

Health 2017年第10期9卷 1416-1426页

作者： Christiane Wilke Lucie Pfeiffer Ingo Frobose Institute of Health Promotion and Clinical Movement Science German Sport University CologneCologneGermany Birkle-Clinic UberlingenGermany

Numerous high performance athletes experience further damage or recurrent injuries even after successful rehabilitation. This is often caused by an insufficient movement quality, which has been very rarely assessed by test protocols which determine the point of reintegration into high performance sports (Return-to-Play, RTP). In order to assess the movement quality both objective and subjective test protocols exist. Objective methods like 3D-movement analysis are viewed as international gold standard, but are not the most practicable solutions for daily training routine. This study aims at reviewing the available literature on reliability and validity of existing subjective test protocols. Further their use within high-performance sports is evaluated. Up to now subjective methods fail to match sufficient validity. However some practical approaches for assessment of movement quality after injury are known. Based on selected criteria first recommendations for the use of different subjective screening test methods are given. In summary further research focusing on the validity of subjective tests is needed. The subjective testing methods should be used in combination with additional tests (e.g. strength testing) in order to identify other risk factors. Recurrent pre-injury screenings on movement quality should be carried out to enhance injury prevention.

关键词： Lower Extremity Injury Movement Quality subjective assessment

Wavelet Packet-based Feedback System for Medical Image Fusion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Semiconductor Photonics and Technology 2010年第Z1期 102-108页

作者： YU Qiuyan1,HAN Xiaojun2(Department of Information and Communication,Tianjin Polytechnic University,Tianjin 300160,CHN)

In order to meet the requirements of medical research,diagnosis and treatment,a new algorithm for image fusion based on the wavelet packet transform in conjunction with both subjective and objective assessments is put forward in the *** to the wavelet transform,the wavelet packet transform is more intricate and effective for the medical image *** indicated by the experimental results,parameters of the feedback system of the new algorithm are significantly superior to those of the wavelet transform,with practicability and accuracy.

关键词： medical image fusion wavelet packet subjective assessment feedback system

Experimental study on the naturalness of synthetic speech

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 1993年第3期12卷 258-264页

作者： LU Shinan, ZHANG Jialu and QI Shiqian (Institute of Acoustics. Academia Sinica, Beijing 100080)

In the past 10 years a Chinese text-to-speech system including a phonetic library, static tone model and basic synthesis rules had been established in IAAS[1]. The Chinese synthesis of unrestricted vocabulary had been achieved, but further steps must be taken to improve the naturalness of synthesized Chinese. The effect of segmental and suprasegmental features of synthetic speech upon naturalness have been studied by use of subjective assessment method. The results show that the rhythm in time domain and coarticulation occupy a basic position for improving the naturalness of synthetic speech. And the fundamental frequency curve decided by tone model only suit to synthesize short sentence of Chinese. If the synthesis of larger linguistic unit than simple sentence is considered, the fundamental frequency curve should be carefully manipulated. This paper presents the experimental method and results, and discusses the way how to improve the naturalness of synthetic Chinese.

关键词： Chinese synthesis subjective assessment Naturalness.