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VISUALIZATION OF THREE-DIMENSIONAL DATA FIELD AND ITS APPLICATION IN MACHINE TESTING
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作者 YIN Aijun QIN Shuren TANG Baoping 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第1期81-84,共4页
In order to realize visualization of three-dimensional data field (TDDF) in instrument, two methods of visualization of TDDF and the usual manner of quick graphic and image processing are analyzed. And how to use Op... In order to realize visualization of three-dimensional data field (TDDF) in instrument, two methods of visualization of TDDF and the usual manner of quick graphic and image processing are analyzed. And how to use OpenGL technique and the characteristic of analyzed data to construct a TDDF, the ways of reality processing and interactive processing are described. Then the medium geometric element and a related realistic model are constructed by means of the first algorithm. Models obtained for attaching the third dimension in three-dimensional data field are presented. An example for TDDF realization of machine measuring is provided. The analysis of resultant graphic indicates that the three-dimensional graphics built by the method developed is featured by good reality, fast processing and strong interaction 展开更多
关键词 visualization in scientific computing Three-dimensional data field (TDDF) Test
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Comparison of Snellen and Early Treatment Diabetic Retinopathy Study charts using a computer simulation 被引量:5
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作者 Reuben R.Shamir Yael Friedman +2 位作者 Leo Joskowicz Michael Mimouni Eytan Z.Blumenthal 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2016年第1期119-123,共5页
AIM:To compare accuracy,reproducibility and test duration for the Snellen and the Early Treatment Diabetic Retinopathy Study(ETDRS)charts,two main tools used to measure visual acuity(VA).·M ETHODS:A compute... AIM:To compare accuracy,reproducibility and test duration for the Snellen and the Early Treatment Diabetic Retinopathy Study(ETDRS)charts,two main tools used to measure visual acuity(VA).·M ETHODS:A computer simulation was programmed to run multiple virtual patients,each with a unique set of assigned parameters,including VA,false-positive and false-negative error values.For each virtual patient,assigned VA was randomly chosen along a continuous scale spanning the range between 1.0 to 0.0 log MAR units(equivalent to 20/200 to 20/20).Each of 30 000virtual patients were run ten times on each of the two VA charts.·RESULTS:Average test duration(expressed as the total number of characters presented during the test±SD)was12.6±11.1 and 31.2±14.7 characters,for the Snellen and ETDRS,respectively.Accuracy,defined as the absolute difference(±SD)between the assigned VA and the measured VA,expressed in log MAR units,was superior in the ETDRS charts:0.12±0.14 and 0.08±0.08,for the Snellen and ETDRS charts,respectively.Reproducibility,expressed as test-retest variability,was superior in the ETDRS charts:0.23±0.17 and 0.11±0.09 log MAR units,for the Snellen and ETDRS charts,respectively.·CONCLUSION:A comparison of true(assigned)VA to measured VA,demonstrated,on average,better accuracy and reproducibility of the ETDRS chart,but at the penalty of significantly longer test duration.These differences were most pronounced in the low VA range.The reproducibility using a simulation approach is in line with reproducibility values found in several clinical studies. 展开更多
关键词 Early Treatment Diabetic RetinopathyStudy Snellen computer simulation visual acuity testing virtual patients
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Applications of dynamic visual acuity test in clinical ophthalmology 被引量:5
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作者 Ting-Yi Wu Yue-Xin Wang Xue-Min Li 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2021年第11期1771-1778,共8页
Dynamic visual acuity test(DVAT)plays a key role in the assessment of vestibular function,the visual function of athletes,as well as various ocular diseases.As the visual pathways conducting dynamic and static signals... Dynamic visual acuity test(DVAT)plays a key role in the assessment of vestibular function,the visual function of athletes,as well as various ocular diseases.As the visual pathways conducting dynamic and static signals are different,DVATs may have potential advantages over the traditional visual acuity tests commonly used,such as static visual acuity,contrast sensitivity,and static perimetry.Here,we provide a review of commonly applied DVATs and their several uses in clinical ophthalmology.These data indicate that the DVAT has its unique clinical significance in the evaluation of several ocular disorders. 展开更多
关键词 dynamic visual acuity test CATARACT DIZZINESS optic neuritis GLAUCOMA
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Working Memory Function in Chinese Dyslexic Children:A Near-Infrared Spectroscopy Study 被引量:2
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作者 朱冬梅 王晶 吴汉荣 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2012年第1期141-145,共5页
The deficiency theories of dyslexia are quite contradictory and the cross-cultural studies in recent years mainly focused on whether the dyslexics among cultures shared the same cognitive profile or just based on the ... The deficiency theories of dyslexia are quite contradictory and the cross-cultural studies in recent years mainly focused on whether the dyslexics among cultures shared the same cognitive profile or just based on the language.This study used Near-Infrared Spectroscopy (NIRS) imaging to measure the regional cerebral blood volume (BV) and the changes of cerebral activation in the left prefrontal cortex of 12 Chinese dyslexic children and their 12 age-matched normal controls during the Paced Vis-ual Serial Addition Test (PVSAT).Results showed that the scores of PVSAT of dyslexic children were significantly lower than those of the normal children (t=3.33,P<0.01).The activations of the left pre-frontal cortex in the normal group were significantly greater than those of dyslexic children (all P<0.01).Our results indicated that Chinese dyslexia had a general deficiency in working memory and this may be caused by the abnormal metabolic activity of brain blood volume in the left prefrontal cortex and the deficits in brain function might be the basis of neuropathology of Chinese dyslexia.Present study sup-ports the difference on brain activation of dyslexics from different languages may be caused by the same cognitive system related to reading. 展开更多
关键词 working memory Near-Infrared Spectroscopy Chinese dyslexia paced visual serial addi-tion test
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THE SIGNIFICANCE OF TESTING PREOPERATIVE VISUAL FUNCTION IN CATARACT USING LASER INTERFEROMETRIC VISUAL ACUITY AND ERG 被引量:2
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作者 De-Zheng Wu Lezheng Wu Xijing Xu Hui Chen Taiqing Luo Zhongshan Ophthalmic Center Sun Yat-sen University of Medical Sciences Guangzhou 510060, China 《眼科学报》 1991年第1期21-24,共4页
Tests of preoperative visual function and prediction of postoperative E chart visual acuity(ECVA) using laser interferometric visual acuity(LIVA) and electroretinogram(ERG) were performed in 16 cases(19 eyes) of catar... Tests of preoperative visual function and prediction of postoperative E chart visual acuity(ECVA) using laser interferometric visual acuity(LIVA) and electroretinogram(ERG) were performed in 16 cases(19 eyes) of cataract. The results showed that the coincident rate between preoperative LIVA and postoperative ECVA was 63.2%, and there was a parallel correlation between preoperative amplitude of photopic ERG b-wave and postoperative ECVA in 79.0% of the eyes. Comparing these two methods, the test of LIVA ... 展开更多
关键词 THE SIGNIFICANCE OF TESTING PREOPERATIVE VISUAL FUNCTION IN CATARACT USING LASER INTERFEROMETRIC VISUAL ACUITY AND ERG
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Investigating Iranian Test-takers' Performance Over Taking Different Modalities of Listening Comprehension Test
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作者 Sajad Faramarzi Atefeh Elekaei, Reza Biria 《Sino-US English Teaching》 2015年第5期327-340,共14页
Visual and pictorial materials are extensively used in teaching listening comprehension textbooks. Although the use of still image is currently implemented in some distinguished testing systems, video test is not a po... Visual and pictorial materials are extensively used in teaching listening comprehension textbooks. Although the use of still image is currently implemented in some distinguished testing systems, video test is not a popular modality due to the fact that this kind of test may result in test-takers' confusion during the test. In the present study, a sample of 80 Iranian EFL (English as a Foreign Language) students was selected to compare their performance on three different modalities of listening test: audio-only test, pictorial (listening with still image test), and visual (video) listening test. The analysis of one-way repeated measure ANOVA (Analysis of Variance) was used to compare the students' scores. The results of Bonferroni Post Hoc Test confirm that there were significant differences in scores among audio-only, pictorial, and visual tests. The results of this study highlight the greater performance of students in pictorial listening test which is statistically significant. 展开更多
关键词 visual listening test pictorial listening test test-taker performance listening assessment still imagelistening test video listening test
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Neurofeedback Treatment Study for ADHD by Using the Brain-Computer Interface Neurofeedback System
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作者 LIU Tian WANG Jue +2 位作者 CHEN Yan-ni WANG Rong SONG Meng 《Chinese Journal of Biomedical Engineering(English Edition)》 2018年第2期81-86,共6页
Neurofeedback or electroencephalogram(EEG) biofeedback technology is widely used in clinical rehabilitation field. In this paper, we used a brain-computer interface(BCI) neurofeedback system for attention deficit hype... Neurofeedback or electroencephalogram(EEG) biofeedback technology is widely used in clinical rehabilitation field. In this paper, we used a brain-computer interface(BCI) neurofeedback system for attention deficit hyperactivity disorder(ADHD) children treatment.After 20 training sessions, integrated visual and auditory-conhnuous performance test(IVA-CPT), DSM-IV and conner scale results suggested that the attention ofsubjectshad been strengthened, which showed that the BCI neurofeedback system could provide an effective therapyfor treating ADHDchildren. 展开更多
关键词 NEUROFEEDBACK attention deficit hyperactivity disorder(ADHD) electroencephalogram(EEG) integrated visual and auditory-continuous performance test(IVA-CPT) scale assessment
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