AIM:To evaluate the role of medical treatment in the management of inflammatory punctum stenosis guided by spectral domain anterior segment optical coherence tomography(OCT).METHODS:This prospective study included 60 ...AIM:To evaluate the role of medical treatment in the management of inflammatory punctum stenosis guided by spectral domain anterior segment optical coherence tomography(OCT).METHODS:This prospective study included 60 patients complaining of epiphora due to inflammatory punctual stenosis.They were divided into two groups:Group A(30 patients)treated with a combination of preservative free hydrocortisone sodium phosphate 3.35 mg/m L eye drops,and preservative free artificial tears based on sodium hyaluronate,polyethylene and propylene Glycol;Group B(30 patients)treated with the same preservative free artificial tears only.Thirty normal subjects were included for comparison of pre-treatment anatomical parameters.Before starting treatment,all patients underwent anterior segment assessment including slit lamp examination,measurement of intraocular pressure(IOP),fluorescein dye disappearance test,and measurement of the outer punctum diameter(OPD)by Spectral domain anterior segment OCT.All assessments were repeated at each follow up done at 1 and 3 mo later,together with subjective evaluation of patient’s satisfaction of the treatment outcome by simple rating questionnaire.RESULTS:Punctual diameter increased significantly with treatment in both groups(P<0.0001);although the widening was more in Group A as compared to group B(16.2%vs 8%of the original punctual size,mean difference of 28.933μm,P=0.0076).Subjective satisfaction with treatment outcome was also better in group A(70%vs 40%,Chi-square P=0.0397).CONCLUSION:A combination of preservative free steroid eye drops and artificial tears causes significant widening of inflammed stenotic punctae and improvement of the associated epiphora.展开更多
The overall punctuality of the railway system is of particular importance for customers in order to use trains as a means of public transport. Investigating the drivers of low punctuality of trains is an essential ste...The overall punctuality of the railway system is of particular importance for customers in order to use trains as a means of public transport. Investigating the drivers of low punctuality of trains is an essential step for improving their punctuality. Severe weather conditions are assumed to be one of the drivers of delays and low punctuality of the transportation system. This paper addresses the extent to which the weather factors such as temperature, snow,precipitation and wind influence the punctuality of trains on the Norwegian railways. The data for the study are collected from the passenger trains on the Nordland Line.The study period is 10 years, from the beginning of 2007 to the end of 2016. Data are analysed on a daily and weekly basis, and correlation and regression analyses are used to perform the statistical analysis. The results show that extreme cold weather during the winters is a crucial influencing factor contributing to delays and low punctuality. We also found that the weather variable that best explains variations in punctuality of passenger trains on this line is snow depth.展开更多
Aviation service plays an indispensable role in the process of social and economic development.In this process,the problem of flight punctuality becomes more and more serious.Flight delay will bring a variety of impli...Aviation service plays an indispensable role in the process of social and economic development.In this process,the problem of flight punctuality becomes more and more serious.Flight delay will bring a variety of implicit and explicit losses to individual passengers and airlines,so it is necessary to analyze the influencing factors of flight punctuality rate.Complex network can be used to study various objects with complex relations,obtain the relations of these objects and calculate the influence of different indicators on the objects.This article mainly has carried on the three aspects:Firstly,get the flight data from the Internet,and use the knowledge of the complex network to obtain the data to build into a directed network.Secondly,to analyze the building of directed network,computing network centricity index,study the influence of different centricity index for flight punctuality.Thirdly,get the statistics of airport indicators including network indicators and calculate the correlation of different indicators and punctuality.Through the above three points,the degree of influence of different influencing factors on flight on-time rate is studied,which is the positive influence or the negative influence.The study of these factors will provide some references for the practical application of the improvement of flight punctuality.展开更多
Previous studies on the collaborative control of signals and vehicles—including both connected autonomous vehicles and connected autonomous buses(CABs)—in networked intersections predominantly emphasized enhancing t...Previous studies on the collaborative control of signals and vehicles—including both connected autonomous vehicles and connected autonomous buses(CABs)—in networked intersections predominantly emphasized enhancing the stability of heterogeneous flows to augment intersection efficiency.However,these studies often overlooked the crucial criterion of CAB punctuality.Addressing this significant gap,the present paper introduces a CAB travel time estimation model and a punctuality evaluation index into optimization problems to ensure the adherence to bus schedules.A mixed integer linear programming model,incorporating binary signal state variables,is established with the goals of heterogeneous platoon operation stability,bus arrival punctuality,and intersection efficiency.To ensure efficient model resolution,binary auxiliary logic variables are employed to linearize the relationship between signal transitions and the operational state of the heterogeneous flow.An evaluation is conducted using a standard four-arm intersection,wherein parameters like CAB proportions and overall traffic volume are varied for comprehensive testing.Simulation outcomes compellingly show that the proposed approach markedly improves CAB punctuality and diminishes energy consumption by enhancing heterogeneous flow stability.Specifically,there is an average increase of 22.3%in punctuality and a reduction of at least 15.1%in energy consumption.展开更多
We present a general formulation based on punctual kriging and fuzzy concepts for image restoration in spatial domain. Gray-level images degraded with Gaussian white noise have been considered. Based on the pixel loca...We present a general formulation based on punctual kriging and fuzzy concepts for image restoration in spatial domain. Gray-level images degraded with Gaussian white noise have been considered. Based on the pixel local neighborhood, fuzzy logic has been employed intelligently to avoid unnecessary estimation of a pixel. The intensity estimation of the selected pixels is then carried out by employing punctual kriging in conjunction with the method of Lagrange multipliers and estimates of local semi-variances. Application of such a hybrid technique performing both selection and intensity estimation of a pixel demonstrates substantial improvement in the image quality as compared to the adaptive Wiener filter and existing fuzzykriging approaches. It has been found that these filters achieve noise reduction without loss of structural detail information, as indicated by their higher structure similarity indices, peak signal to noise ratios and the new variogram based quality measures.展开更多
In this paper,two types of frequency amplitude fomulation method are initially utilized to obtain frequency-amplitude relationship of nonlinear vibration of a punctual charge in the electric field of a charged ring.In...In this paper,two types of frequency amplitude fomulation method are initially utilized to obtain frequency-amplitude relationship of nonlinear vibration of a punctual charge in the electric field of a charged ring.In order to obtain the nonlinear natural frequency of the considered system,Reng-Gui and Geng-Cai modified methods are implemented.A table is also prepared to provide a brief review of recent development of nonlinear differential equations.The coectness of the obtained results is compared with those obtained from harmonic balance method(HBM)and energy balance method(EBM).A numerical simulation is caied out to investigate the accuracy of the used methods.In accordance with it,the relative errors of the employed approaches are numerically and analytically found based on the exact numerical solutions.It is exposed that the exerted approaches are very reliable and applicable for solving the nonlinear differential equations.展开更多
目的探讨失效模式和效应分析(failure mode and effect analysis,FMEA)在改进MRI检查执行流程中提高预约执行准时率的效果。方法组建FMEA项目研究团队,运用FMEA对成都大学附属医院MRI检查执行流程中的失效环节进行风险分析,根据其严重程...目的探讨失效模式和效应分析(failure mode and effect analysis,FMEA)在改进MRI检查执行流程中提高预约执行准时率的效果。方法组建FMEA项目研究团队,运用FMEA对成都大学附属医院MRI检查执行流程中的失效环节进行风险分析,根据其严重程度(severity,S),发生频度(frequency of occurrence,O),可探测度(liklihood of detection,D),计算各环节风险优先数(risk priority number,RPN),对高风险环节进行流程再造,制定标准操作流程,观察预约执行准时率及医、患满意度改善情况。结果MRI预约检查执行准时率由改进前的50.00%上升到改进后的86.55%,患者满意度由原来的62.40%上升到87.28%,医护人员的满意度由原来的77.77%上升到87.78%,P均<0.05,有统计学意义。结论运用FMEA对住院患者MRI检查流程进行失效环节改进,有效改善了MRI的运行效率。展开更多
文摘AIM:To evaluate the role of medical treatment in the management of inflammatory punctum stenosis guided by spectral domain anterior segment optical coherence tomography(OCT).METHODS:This prospective study included 60 patients complaining of epiphora due to inflammatory punctual stenosis.They were divided into two groups:Group A(30 patients)treated with a combination of preservative free hydrocortisone sodium phosphate 3.35 mg/m L eye drops,and preservative free artificial tears based on sodium hyaluronate,polyethylene and propylene Glycol;Group B(30 patients)treated with the same preservative free artificial tears only.Thirty normal subjects were included for comparison of pre-treatment anatomical parameters.Before starting treatment,all patients underwent anterior segment assessment including slit lamp examination,measurement of intraocular pressure(IOP),fluorescein dye disappearance test,and measurement of the outer punctum diameter(OPD)by Spectral domain anterior segment OCT.All assessments were repeated at each follow up done at 1 and 3 mo later,together with subjective evaluation of patient’s satisfaction of the treatment outcome by simple rating questionnaire.RESULTS:Punctual diameter increased significantly with treatment in both groups(P<0.0001);although the widening was more in Group A as compared to group B(16.2%vs 8%of the original punctual size,mean difference of 28.933μm,P=0.0076).Subjective satisfaction with treatment outcome was also better in group A(70%vs 40%,Chi-square P=0.0397).CONCLUSION:A combination of preservative free steroid eye drops and artificial tears causes significant widening of inflammed stenotic punctae and improvement of the associated epiphora.
文摘The overall punctuality of the railway system is of particular importance for customers in order to use trains as a means of public transport. Investigating the drivers of low punctuality of trains is an essential step for improving their punctuality. Severe weather conditions are assumed to be one of the drivers of delays and low punctuality of the transportation system. This paper addresses the extent to which the weather factors such as temperature, snow,precipitation and wind influence the punctuality of trains on the Norwegian railways. The data for the study are collected from the passenger trains on the Nordland Line.The study period is 10 years, from the beginning of 2007 to the end of 2016. Data are analysed on a daily and weekly basis, and correlation and regression analyses are used to perform the statistical analysis. The results show that extreme cold weather during the winters is a crucial influencing factor contributing to delays and low punctuality. We also found that the weather variable that best explains variations in punctuality of passenger trains on this line is snow depth.
基金supported by the National Natural Science Foundation of China(61871046).
文摘Aviation service plays an indispensable role in the process of social and economic development.In this process,the problem of flight punctuality becomes more and more serious.Flight delay will bring a variety of implicit and explicit losses to individual passengers and airlines,so it is necessary to analyze the influencing factors of flight punctuality rate.Complex network can be used to study various objects with complex relations,obtain the relations of these objects and calculate the influence of different indicators on the objects.This article mainly has carried on the three aspects:Firstly,get the flight data from the Internet,and use the knowledge of the complex network to obtain the data to build into a directed network.Secondly,to analyze the building of directed network,computing network centricity index,study the influence of different centricity index for flight punctuality.Thirdly,get the statistics of airport indicators including network indicators and calculate the correlation of different indicators and punctuality.Through the above three points,the degree of influence of different influencing factors on flight on-time rate is studied,which is the positive influence or the negative influence.The study of these factors will provide some references for the practical application of the improvement of flight punctuality.
基金supported by the key project of National Natural Science Foundation of China(No.52432011)Jiangsu Province Science Fund for Distinguished Young Scholars(No.BK20200014),and VINNOVA(No.2024-00810).
文摘Previous studies on the collaborative control of signals and vehicles—including both connected autonomous vehicles and connected autonomous buses(CABs)—in networked intersections predominantly emphasized enhancing the stability of heterogeneous flows to augment intersection efficiency.However,these studies often overlooked the crucial criterion of CAB punctuality.Addressing this significant gap,the present paper introduces a CAB travel time estimation model and a punctuality evaluation index into optimization problems to ensure the adherence to bus schedules.A mixed integer linear programming model,incorporating binary signal state variables,is established with the goals of heterogeneous platoon operation stability,bus arrival punctuality,and intersection efficiency.To ensure efficient model resolution,binary auxiliary logic variables are employed to linearize the relationship between signal transitions and the operational state of the heterogeneous flow.An evaluation is conducted using a standard four-arm intersection,wherein parameters like CAB proportions and overall traffic volume are varied for comprehensive testing.Simulation outcomes compellingly show that the proposed approach markedly improves CAB punctuality and diminishes energy consumption by enhancing heterogeneous flow stability.Specifically,there is an average increase of 22.3%in punctuality and a reduction of at least 15.1%in energy consumption.
基金This work has been sponsored by the Higher Education Commission,Government of Pakistan under the Scholarship Grant No.17-6(176)Sch/2001.
文摘We present a general formulation based on punctual kriging and fuzzy concepts for image restoration in spatial domain. Gray-level images degraded with Gaussian white noise have been considered. Based on the pixel local neighborhood, fuzzy logic has been employed intelligently to avoid unnecessary estimation of a pixel. The intensity estimation of the selected pixels is then carried out by employing punctual kriging in conjunction with the method of Lagrange multipliers and estimates of local semi-variances. Application of such a hybrid technique performing both selection and intensity estimation of a pixel demonstrates substantial improvement in the image quality as compared to the adaptive Wiener filter and existing fuzzykriging approaches. It has been found that these filters achieve noise reduction without loss of structural detail information, as indicated by their higher structure similarity indices, peak signal to noise ratios and the new variogram based quality measures.
文摘In this paper,two types of frequency amplitude fomulation method are initially utilized to obtain frequency-amplitude relationship of nonlinear vibration of a punctual charge in the electric field of a charged ring.In order to obtain the nonlinear natural frequency of the considered system,Reng-Gui and Geng-Cai modified methods are implemented.A table is also prepared to provide a brief review of recent development of nonlinear differential equations.The coectness of the obtained results is compared with those obtained from harmonic balance method(HBM)and energy balance method(EBM).A numerical simulation is caied out to investigate the accuracy of the used methods.In accordance with it,the relative errors of the employed approaches are numerically and analytically found based on the exact numerical solutions.It is exposed that the exerted approaches are very reliable and applicable for solving the nonlinear differential equations.
文摘针对既有列车在运行时未能合理实现节能和准点的问题,文章分析列车节能运行和准点运行的耦合机理,提出一种基于多目标动态规划的列车节能准点运行策略(multi-objective dynamic programmingbased energy saving punctuality operation strategy of train,MDP-EP)。首先,依据运行能耗和运行时间的累加特性,根据线路特征信息将列车运行线路设计为若干个子区间,提高对线路特征信息变化的自适应性;然后,通过运动学约束和动力学约束分别生成速度域可达集和牵引/制动力域可达集,通过状态量约束和控制量约束提高对列车复杂操纵特性约束的自适应性,接着,结合节能准点目标的耦合机理设计最小能耗-最优运行时间目标函数,设计多目标动态规划方法进行迭代求解;最后,基于MATLAB仿真环境和试验环境,验证MDP-EP应用于高速列车的节能准点效果,结果表明,所提出的MDP-EP在保证运行时间的前提下使得高速列车均具有良好的节能性能,相比准点规划,节能指标提高10%~12%。
文摘目的探讨失效模式和效应分析(failure mode and effect analysis,FMEA)在改进MRI检查执行流程中提高预约执行准时率的效果。方法组建FMEA项目研究团队,运用FMEA对成都大学附属医院MRI检查执行流程中的失效环节进行风险分析,根据其严重程度(severity,S),发生频度(frequency of occurrence,O),可探测度(liklihood of detection,D),计算各环节风险优先数(risk priority number,RPN),对高风险环节进行流程再造,制定标准操作流程,观察预约执行准时率及医、患满意度改善情况。结果MRI预约检查执行准时率由改进前的50.00%上升到改进后的86.55%,患者满意度由原来的62.40%上升到87.28%,医护人员的满意度由原来的77.77%上升到87.78%,P均<0.05,有统计学意义。结论运用FMEA对住院患者MRI检查流程进行失效环节改进,有效改善了MRI的运行效率。
