In order to overcome the problem that the CUR matrix decomposition algorithm loses a large amount of information when compressing images, the quality of reconstructed images is not high, we propose a CUR matrix decomp...In order to overcome the problem that the CUR matrix decomposition algorithm loses a large amount of information when compressing images, the quality of reconstructed images is not high, we propose a CUR matrix decomposition algorithm based on standard deviation sampling. Because of retaining more image information, the reconstructed image quality is higher under the same compression ratio. At the same time, in order to further reduce the amount of image information lost during the sampling process of the CUR matrix decomposition algorithm, we propose the SVD-CUR algorithm. The experimental results verify that our algorithm can achieve high image compression efficiency, and also demonstrate the high precision and robustness of CUR matrix decomposition algorithm in dealing with low rank sparse matrix data.展开更多
Standard deviation(SD)and standard error of the mean(SEM)have been applied widely as error bars in scientific plots.Unfortunately,there is no universally accepted principle addressing which of these 2 measures should ...Standard deviation(SD)and standard error of the mean(SEM)have been applied widely as error bars in scientific plots.Unfortunately,there is no universally accepted principle addressing which of these 2 measures should be used.Here we seek to fill this gap by outlining the reasoning for choosing SEM over SD and hope to shed light on this unsettled disagreement among the biomedical community.The utility of SEM and SD as error bars is further discussed by examining the figures and plots published in 2 research articles on pancreatic disease.展开更多
针对无线智能音响系统音源声道与音箱手动配置烦琐的问题,文章提出了一种新的自适应配置方法,利用音箱Wi-Fi接收信号强度指示(Received Signal Strength Indicator,RSSI)参数实现无线智能音响系统自动配置。该方法通过采集音箱间的相互...针对无线智能音响系统音源声道与音箱手动配置烦琐的问题,文章提出了一种新的自适应配置方法,利用音箱Wi-Fi接收信号强度指示(Received Signal Strength Indicator,RSSI)参数实现无线智能音响系统自动配置。该方法通过采集音箱间的相互发射-接收信号的RSSI参数,组成原始数组,采用数据统计分析方法提取数组的数据特征,对比分析数据特征置信区间的重叠度,辨识各音箱功能;进行音源声道与音箱的自动匹配连接,实现智能音响系统音源声道的自适应配置。实测结果表明,该方法不仅稳定可靠,还能为用户带来更高的人工智能(Artificial Intelligence,AI)服务体验。展开更多
AIM: Prospectively analyze the long term structural and functional changes in patients of primary open angle glaucoma(POAG) receiving medical therapy(beta blockers and non beta blockers). In this study an attempt has ...AIM: Prospectively analyze the long term structural and functional changes in patients of primary open angle glaucoma(POAG) receiving medical therapy(beta blockers and non beta blockers). In this study an attempt has been made to evaluate whether medical reduction of IOP prevents or delays the progression of glaucomatous visual field loss and/or optic nerve damage in patients with open angle glaucoma. · METHODS: Study conducted over a period of 27 months,at a tertiary eye care hospital including both eyes of 40 patients with POAG. Group 1(20 patients,40 eyes) received beta-blockers,and Group 2(20 patients,40 eyes) received non-beta-blockers. Each patient underwent intraocular pressure measurement,best corrected visual acuity,slit-lamp,fundus examination,gonioscopy,central corneal thickness,visual field assessment by Humphrey automated perimetry and retinal nerve fibre layer thickness by Stratus optical coherence tomography at baseline and at two subsequent visits. The average time interval between each visit was 10-11 months. The statistical analysis was done using one-way analysis of variance(ANOVA). Post-hoc test,using tukey’ method were adopted. Probablity(P) value of 0.05 or less was considered to be statistically significant. ·RESULTS: A total of 80 eyes of 40 patients of POAG were enrolled,24 males,16 females,age group 50-80 years. In both beta and non beta blocker group,reduction(improvement) in mean IOP from initial levels to the levels achieved at the 2nd and 3rd visits was statistically significant. One way ANOVA(df=2),fisher f value =11.64,P =0.000,one way ANOVA(df =3),fisher f value =35.61,P =0.000. Both mean deviation(MD) and pattern standard deviation(PSD) in both beta and nonbeta blockers at different visits were not statistically significant. Retinal nerve fibre layer thickness(RNFL)-only mean inferior retinal nerve fibre layer,the difference between the mean value in beta and non beta blocker groupwere statistically significant. [unpaired t test value(df =78) =2.27,P =0.03]. Side effects with beta blocker were conjunctival hyperemia(10%),burning(5%),and conjunctival hyperemia(5%) in non beta blockers. ·CONCLUSION: Non-beta-blockers are as effective as beta-blockers in bringing about a significant lowering of intraocular pressure to the normal range,and in preventing progressive damage to the visual fields and retinal nerve fibre layer. The absence of systemic side effects and superior IOP lowering efficacy has made non beta-blockers attractive for first line therapy for the treatment of glaucoma worldwide.展开更多
Grain size analysis and sedimentology of beach sediments in Lagos, southwestern Nigeria have been studied. Ten fresh beach sediment samples were randomly collected at a depth of 25 cm - 40 cm along Lagos and Badagry a...Grain size analysis and sedimentology of beach sediments in Lagos, southwestern Nigeria have been studied. Ten fresh beach sediment samples were randomly collected at a depth of 25 cm - 40 cm along Lagos and Badagry axis. The sediments were analyzed by wet sieving method. Ternary diagrams indicate that the beach sediment is silty. The graphic mean ranges from 1.02ф (medium grained) to 2.21ф (fine grained) with an average of 1.61ф (medium grained). The preponderance of medium grained sediments and lack of coarse sands suggest moderate to high energy conditions of deposition. Graphic standard deviation ranges from 0.01ф - 0.81ф (very well sorted to moderately well sorted), with an average of 0.52ф (moderately well sorted). This is probably due to rapid back and forth flow of the depositing medium. Inclusive graphic skewness ranges from -0.38 to 1.41 (strongly coarse skewed to strongly fine skewed), with an average of 0.41 (strongly fine skewed). The graphic kurtosis values are between 0.44 and 1.37, which indicates very platykurtic to leptokurtic;with an average of 0.78 (platykurtic). This variation suggests that part of the sediment achieved its sorting elsewhere in high-energy environment. Histograms of the sediments exhibit both unimodal and bimodal trends. The arrangement is dominantly asymmetrical with varying modal class, which could be attributed to variation in the energy of the transporting medium. Bivariate plots (simple skewness vs. standard deviation and mean size vs. standard deviation) show the samples plotting mainly in the river sand zone, which suggests that the sediments were initially river sediments before reworking to the present site;other parameters that discriminate between river channel deposits, overbank deposits and overbank-pool deposits show the beach sediments plotting in the river channel zone. Linear discriminant functions analysis indicates a shallow marine beach environment in agitated water, with inputs from aeolian source. The Passega C-M diagram suggests suspension and rolling as the mode of deposition.展开更多
文摘In order to overcome the problem that the CUR matrix decomposition algorithm loses a large amount of information when compressing images, the quality of reconstructed images is not high, we propose a CUR matrix decomposition algorithm based on standard deviation sampling. Because of retaining more image information, the reconstructed image quality is higher under the same compression ratio. At the same time, in order to further reduce the amount of image information lost during the sampling process of the CUR matrix decomposition algorithm, we propose the SVD-CUR algorithm. The experimental results verify that our algorithm can achieve high image compression efficiency, and also demonstrate the high precision and robustness of CUR matrix decomposition algorithm in dealing with low rank sparse matrix data.
基金BZ research was supported,in part,by the National Institutes of Health grant U24 AA026968the University of Massachusetts Center for Clinical and Translational Science grants UL1TR001453,TL1TR01454,and KL2TR01455.
文摘Standard deviation(SD)and standard error of the mean(SEM)have been applied widely as error bars in scientific plots.Unfortunately,there is no universally accepted principle addressing which of these 2 measures should be used.Here we seek to fill this gap by outlining the reasoning for choosing SEM over SD and hope to shed light on this unsettled disagreement among the biomedical community.The utility of SEM and SD as error bars is further discussed by examining the figures and plots published in 2 research articles on pancreatic disease.
文摘针对无线智能音响系统音源声道与音箱手动配置烦琐的问题,文章提出了一种新的自适应配置方法,利用音箱Wi-Fi接收信号强度指示(Received Signal Strength Indicator,RSSI)参数实现无线智能音响系统自动配置。该方法通过采集音箱间的相互发射-接收信号的RSSI参数,组成原始数组,采用数据统计分析方法提取数组的数据特征,对比分析数据特征置信区间的重叠度,辨识各音箱功能;进行音源声道与音箱的自动匹配连接,实现智能音响系统音源声道的自适应配置。实测结果表明,该方法不仅稳定可靠,还能为用户带来更高的人工智能(Artificial Intelligence,AI)服务体验。
文摘AIM: Prospectively analyze the long term structural and functional changes in patients of primary open angle glaucoma(POAG) receiving medical therapy(beta blockers and non beta blockers). In this study an attempt has been made to evaluate whether medical reduction of IOP prevents or delays the progression of glaucomatous visual field loss and/or optic nerve damage in patients with open angle glaucoma. · METHODS: Study conducted over a period of 27 months,at a tertiary eye care hospital including both eyes of 40 patients with POAG. Group 1(20 patients,40 eyes) received beta-blockers,and Group 2(20 patients,40 eyes) received non-beta-blockers. Each patient underwent intraocular pressure measurement,best corrected visual acuity,slit-lamp,fundus examination,gonioscopy,central corneal thickness,visual field assessment by Humphrey automated perimetry and retinal nerve fibre layer thickness by Stratus optical coherence tomography at baseline and at two subsequent visits. The average time interval between each visit was 10-11 months. The statistical analysis was done using one-way analysis of variance(ANOVA). Post-hoc test,using tukey’ method were adopted. Probablity(P) value of 0.05 or less was considered to be statistically significant. ·RESULTS: A total of 80 eyes of 40 patients of POAG were enrolled,24 males,16 females,age group 50-80 years. In both beta and non beta blocker group,reduction(improvement) in mean IOP from initial levels to the levels achieved at the 2nd and 3rd visits was statistically significant. One way ANOVA(df=2),fisher f value =11.64,P =0.000,one way ANOVA(df =3),fisher f value =35.61,P =0.000. Both mean deviation(MD) and pattern standard deviation(PSD) in both beta and nonbeta blockers at different visits were not statistically significant. Retinal nerve fibre layer thickness(RNFL)-only mean inferior retinal nerve fibre layer,the difference between the mean value in beta and non beta blocker groupwere statistically significant. [unpaired t test value(df =78) =2.27,P =0.03]. Side effects with beta blocker were conjunctival hyperemia(10%),burning(5%),and conjunctival hyperemia(5%) in non beta blockers. ·CONCLUSION: Non-beta-blockers are as effective as beta-blockers in bringing about a significant lowering of intraocular pressure to the normal range,and in preventing progressive damage to the visual fields and retinal nerve fibre layer. The absence of systemic side effects and superior IOP lowering efficacy has made non beta-blockers attractive for first line therapy for the treatment of glaucoma worldwide.
文摘Grain size analysis and sedimentology of beach sediments in Lagos, southwestern Nigeria have been studied. Ten fresh beach sediment samples were randomly collected at a depth of 25 cm - 40 cm along Lagos and Badagry axis. The sediments were analyzed by wet sieving method. Ternary diagrams indicate that the beach sediment is silty. The graphic mean ranges from 1.02ф (medium grained) to 2.21ф (fine grained) with an average of 1.61ф (medium grained). The preponderance of medium grained sediments and lack of coarse sands suggest moderate to high energy conditions of deposition. Graphic standard deviation ranges from 0.01ф - 0.81ф (very well sorted to moderately well sorted), with an average of 0.52ф (moderately well sorted). This is probably due to rapid back and forth flow of the depositing medium. Inclusive graphic skewness ranges from -0.38 to 1.41 (strongly coarse skewed to strongly fine skewed), with an average of 0.41 (strongly fine skewed). The graphic kurtosis values are between 0.44 and 1.37, which indicates very platykurtic to leptokurtic;with an average of 0.78 (platykurtic). This variation suggests that part of the sediment achieved its sorting elsewhere in high-energy environment. Histograms of the sediments exhibit both unimodal and bimodal trends. The arrangement is dominantly asymmetrical with varying modal class, which could be attributed to variation in the energy of the transporting medium. Bivariate plots (simple skewness vs. standard deviation and mean size vs. standard deviation) show the samples plotting mainly in the river sand zone, which suggests that the sediments were initially river sediments before reworking to the present site;other parameters that discriminate between river channel deposits, overbank deposits and overbank-pool deposits show the beach sediments plotting in the river channel zone. Linear discriminant functions analysis indicates a shallow marine beach environment in agitated water, with inputs from aeolian source. The Passega C-M diagram suggests suspension and rolling as the mode of deposition.
