To fulfill the requirements for hybrid real-time system scheduling, a long-release-interval-first （LRIF） real-time scheduling algorithm is proposed. The algorithm adopts both the fixed priority and the dynamic prior...To fulfill the requirements for hybrid real-time system scheduling, a long-release-interval-first （LRIF） real-time scheduling algorithm is proposed. The algorithm adopts both the fixed priority and the dynamic priority to assign priorities for tasks. By assigning higher priorities to the aperiodic soft real-time jobs with longer release intervals, it guarantees the executions for periodic hard real-time tasks and further probabilistically guarantees the executions for aperiodic soft real-time tasks. The schedulability test approach for the LRIF algorithm is presented. The implementation issues of the LRIF algorithm are also discussed. Simulation result shows that LRIF obtains better schedulable performance than the maximum urgency first （MUF） algorithm, the earliest deadline first （EDF） algorithm and EDF for hybrid tasks. LRIF has great capability to schedule both periodic hard real-time and aperiodic soft real-time tasks.展开更多
Dear Sir,Iam Dr.Ye Zhang,from Beijing Tongren Eye Center,Beijing Tongren Hospital,Beijing,China.I write to present a case report of bilateral retinoblastoma(Rb)with10-year-interval of onsets.Rb is the most common mali...Dear Sir,Iam Dr.Ye Zhang,from Beijing Tongren Eye Center,Beijing Tongren Hospital,Beijing,China.I write to present a case report of bilateral retinoblastoma(Rb)with10-year-interval of onsets.Rb is the most common malignant intraocular tumor of infancy and childhood,with the majority of cases being diagnosed before 5 years of age.It may involve in unilateral or bilateral eye.Studies showed that the interval of the onsets of bilateral Rb is always within three years.So it is very rare展开更多
This paper uses Gaussian interval type-2 fuzzy se theory on historical traffic volume data processing to obtain a 24-hour prediction of traffic volume with high precision. A K-means clustering method is used in this p...This paper uses Gaussian interval type-2 fuzzy se theory on historical traffic volume data processing to obtain a 24-hour prediction of traffic volume with high precision. A K-means clustering method is used in this paper to get 5 minutes traffic volume variation as input data for the Gaussian interval type-2 fuzzy sets which can reflect the distribution of historical traffic volume in one statistical period. Moreover, the cluster with the largest collection of data obtained by K-means clustering method is calculated to get the key parameters of type-2 fuzzy sets, mean and standard deviation of the Gaussian membership function.Using the range of data as the input of Gaussian interval type-2 fuzzy sets leads to the range of traffic volume forecasting output with the ability of describing the possible range of the traffic volume as well as the traffic volume prediction data with high accuracy. The simulation results show that the average relative error is reduced to 8% based on the combined K-means Gaussian interval type-2 fuzzy sets forecasting method. The fluctuation range in terms of an upper and a lower forecasting traffic volume completely envelopes the actual traffic volume and reproduces the fluctuation range of traffic flow.展开更多
With the improvement of our country's economy and people's living standard, tunnels and underground works have been further developed and popularized. Tunnel and underground engineering is a promising science ...With the improvement of our country's economy and people's living standard, tunnels and underground works have been further developed and popularized. Tunnel and underground engineering is a promising science to solve the traffic and industrial problems in our country. Taking the shield section from Yingrenshi Station to Luozu Station in the fourth work area of Shenzhen metro line 13 as an example, this paper expounds the application of the conductor layout method in the long section shield tunnel, which adopts the addition of a common edge between the main conductor and the auxiliary conductor to form a closed loop, compares and analyzes with the gyro directional data, and measures the penetration error after the tunnel is penetrated, so as to provide help for the layout of the long section shield tunnel control survey control network.展开更多
Asymptotic eigenvalues and eigenfunctions for the Orr-Sommerfeld equation in two-dimensional and three-dimensional incompressible flows on an infinite domain and on a semi-infinite domain are obtained. Two configurati...Asymptotic eigenvalues and eigenfunctions for the Orr-Sommerfeld equation in two-dimensional and three-dimensional incompressible flows on an infinite domain and on a semi-infinite domain are obtained. Two configurations are considered, one in which a short-wave limit approximation is used, and another in which a long-wave limit approximation is used. In the short-wave limit, Wentzel-Kramers-Brillouin (WKB) methods are utilized to estimate the eigenvalues, and the eigenfunctions are approximated in terms of Green’s functions. The procedure consists of transforming the Orr-Sommerfeld equation into a system of two second order ordinary differential equations for which the eigenvalues and the eigenfunctions can be approximated. In the long-wave limit approximation, solutions are expressed in terms of generalized hypergeometric functions. Our procedure works regardless of the values of the Reynolds number.展开更多
目的:国外文献提示运动平板试验QT间期延长是长QT综合征(LQTS)的表现之一,但国内常规运动平板试验检查未测量分析QT/校正QT(QTc)间期。本研究旨在探索运动平板试验作为国人LQTS辅助诊断操作流程的可行性和有效性。方法:前瞻性连续入选2...目的:国外文献提示运动平板试验QT间期延长是长QT综合征(LQTS)的表现之一,但国内常规运动平板试验检查未测量分析QT/校正QT(QTc)间期。本研究旨在探索运动平板试验作为国人LQTS辅助诊断操作流程的可行性和有效性。方法:前瞻性连续入选2023年7月至2024年7月在中国医学科学院阜外医院行运动平板试验者80例,包括健康对照37例、常见心血管疾病患者25例及基因和临床诊断或疑诊LQTS患者18例,即健康对照组、常见心血管疾病组和疑诊LQTS组。研究对象均行本研究设置的辅助诊断LQTS的运动平板试验检查方案,即在运动平板试验开始前卧位、坐位、立位及运动峰值、恢复期1 min和4 min共6个时间点记录12导联心电图并测量QTc间期。对比3组研究对象在上述6个时间点的QTc间期差异。结果:健康对照组和常见心血管疾病组在运动平板试验检查前后6个时间点的QTc间期均<480 ms,且两组差异均无统计学意义(P均>0.05)。疑诊LQTS组恢复期4 min QTc间期≥480 ms者占66.7%(12/18),其中5例基因检测有明确LQTS致病基因突变(包括1例基因诊断LQTS1型,卧位心电图QTc间期489 ms,恢复期4 min QTc间期636 ms);5例为Schwartz评分≥4分临床确诊患者(基因检测阴性或未检测),另2例Schwartz评分为3分。疑诊LQTS组恢复期4 min QTc间期在445~480 ms者占27.8%(5/18),包括2例临床Schwartz评分≥4分和3例临床疑诊(Schwartz评分2~3分)患者。还有1例临床疑诊(Schwartz评分3分)患者恢复期4 min QTc间期<445 ms,后期基因检测阴性。受试者工作特征(ROC)曲线分析显示,恢复期4 min QTc间期≥482 ms辅助诊断LQTS的灵敏度为83.3%、特异度为98.4%。结论:测量多个时间点QTc间期的运动平板试验检查方案能够有效识别LQTS,在临床实践中有较强的可行性和推广性。展开更多
基金The Natural Science Foundation of Jiangsu Province(NoBK2005408)
文摘To fulfill the requirements for hybrid real-time system scheduling, a long-release-interval-first （LRIF） real-time scheduling algorithm is proposed. The algorithm adopts both the fixed priority and the dynamic priority to assign priorities for tasks. By assigning higher priorities to the aperiodic soft real-time jobs with longer release intervals, it guarantees the executions for periodic hard real-time tasks and further probabilistically guarantees the executions for aperiodic soft real-time tasks. The schedulability test approach for the LRIF algorithm is presented. The implementation issues of the LRIF algorithm are also discussed. Simulation result shows that LRIF obtains better schedulable performance than the maximum urgency first （MUF） algorithm, the earliest deadline first （EDF） algorithm and EDF for hybrid tasks. LRIF has great capability to schedule both periodic hard real-time and aperiodic soft real-time tasks.
文摘Dear Sir,Iam Dr.Ye Zhang,from Beijing Tongren Eye Center,Beijing Tongren Hospital,Beijing,China.I write to present a case report of bilateral retinoblastoma(Rb)with10-year-interval of onsets.Rb is the most common malignant intraocular tumor of infancy and childhood,with the majority of cases being diagnosed before 5 years of age.It may involve in unilateral or bilateral eye.Studies showed that the interval of the onsets of bilateral Rb is always within three years.So it is very rare
基金supported by the National Key Research and Development Program of China(2018YFB1201500)
文摘This paper uses Gaussian interval type-2 fuzzy se theory on historical traffic volume data processing to obtain a 24-hour prediction of traffic volume with high precision. A K-means clustering method is used in this paper to get 5 minutes traffic volume variation as input data for the Gaussian interval type-2 fuzzy sets which can reflect the distribution of historical traffic volume in one statistical period. Moreover, the cluster with the largest collection of data obtained by K-means clustering method is calculated to get the key parameters of type-2 fuzzy sets, mean and standard deviation of the Gaussian membership function.Using the range of data as the input of Gaussian interval type-2 fuzzy sets leads to the range of traffic volume forecasting output with the ability of describing the possible range of the traffic volume as well as the traffic volume prediction data with high accuracy. The simulation results show that the average relative error is reduced to 8% based on the combined K-means Gaussian interval type-2 fuzzy sets forecasting method. The fluctuation range in terms of an upper and a lower forecasting traffic volume completely envelopes the actual traffic volume and reproduces the fluctuation range of traffic flow.
文摘With the improvement of our country's economy and people's living standard, tunnels and underground works have been further developed and popularized. Tunnel and underground engineering is a promising science to solve the traffic and industrial problems in our country. Taking the shield section from Yingrenshi Station to Luozu Station in the fourth work area of Shenzhen metro line 13 as an example, this paper expounds the application of the conductor layout method in the long section shield tunnel, which adopts the addition of a common edge between the main conductor and the auxiliary conductor to form a closed loop, compares and analyzes with the gyro directional data, and measures the penetration error after the tunnel is penetrated, so as to provide help for the layout of the long section shield tunnel control survey control network.
文摘Asymptotic eigenvalues and eigenfunctions for the Orr-Sommerfeld equation in two-dimensional and three-dimensional incompressible flows on an infinite domain and on a semi-infinite domain are obtained. Two configurations are considered, one in which a short-wave limit approximation is used, and another in which a long-wave limit approximation is used. In the short-wave limit, Wentzel-Kramers-Brillouin (WKB) methods are utilized to estimate the eigenvalues, and the eigenfunctions are approximated in terms of Green’s functions. The procedure consists of transforming the Orr-Sommerfeld equation into a system of two second order ordinary differential equations for which the eigenvalues and the eigenfunctions can be approximated. In the long-wave limit approximation, solutions are expressed in terms of generalized hypergeometric functions. Our procedure works regardless of the values of the Reynolds number.
文摘目的:国外文献提示运动平板试验QT间期延长是长QT综合征(LQTS)的表现之一,但国内常规运动平板试验检查未测量分析QT/校正QT(QTc)间期。本研究旨在探索运动平板试验作为国人LQTS辅助诊断操作流程的可行性和有效性。方法:前瞻性连续入选2023年7月至2024年7月在中国医学科学院阜外医院行运动平板试验者80例,包括健康对照37例、常见心血管疾病患者25例及基因和临床诊断或疑诊LQTS患者18例,即健康对照组、常见心血管疾病组和疑诊LQTS组。研究对象均行本研究设置的辅助诊断LQTS的运动平板试验检查方案,即在运动平板试验开始前卧位、坐位、立位及运动峰值、恢复期1 min和4 min共6个时间点记录12导联心电图并测量QTc间期。对比3组研究对象在上述6个时间点的QTc间期差异。结果:健康对照组和常见心血管疾病组在运动平板试验检查前后6个时间点的QTc间期均<480 ms,且两组差异均无统计学意义(P均>0.05)。疑诊LQTS组恢复期4 min QTc间期≥480 ms者占66.7%(12/18),其中5例基因检测有明确LQTS致病基因突变(包括1例基因诊断LQTS1型,卧位心电图QTc间期489 ms,恢复期4 min QTc间期636 ms);5例为Schwartz评分≥4分临床确诊患者(基因检测阴性或未检测),另2例Schwartz评分为3分。疑诊LQTS组恢复期4 min QTc间期在445~480 ms者占27.8%(5/18),包括2例临床Schwartz评分≥4分和3例临床疑诊(Schwartz评分2~3分)患者。还有1例临床疑诊(Schwartz评分3分)患者恢复期4 min QTc间期<445 ms,后期基因检测阴性。受试者工作特征(ROC)曲线分析显示,恢复期4 min QTc间期≥482 ms辅助诊断LQTS的灵敏度为83.3%、特异度为98.4%。结论:测量多个时间点QTc间期的运动平板试验检查方案能够有效识别LQTS,在临床实践中有较强的可行性和推广性。
