In web services testing, accessing the interactive contents of measured Services and the information of service condition accurately are the key issues of system design and realization. A non-intrusive solution based ...In web services testing, accessing the interactive contents of measured Services and the information of service condition accurately are the key issues of system design and realization. A non-intrusive solution based on axis2 is presented to overcome the difficulty of the information retrieval in web service testing. It can be plugged in server side or client side freely to test pre-deployed or deployed web services. Moreover, it provides a monitoring interface and the corresponding subscription publication mechanism for users based on web services to support the quality assurance grounded on service-oriented architecture （SOA） application service.展开更多
Considering the characteristics of strong nonlinearity,aerodynamic uncertainty and channel coupling of aircraft at high angle of attack(AOA)maneuvers,this paper studies the robust adaptive control based on monitoring ...Considering the characteristics of strong nonlinearity,aerodynamic uncertainty and channel coupling of aircraft at high angle of attack(AOA)maneuvers,this paper studies the robust adaptive control based on monitoring mechanism.By treating channel coupling as part of the total disturbances,the flight dynamics is decomposed into the AOA,sideslip angle and roll rate subsystems.For each subsystem,a robust intelligent controller that utilises error feedback and estimation feedforward is designed to achieve desired control moments.Subsequently,the deflections of aerodynamic control surfaces and thrust vector nozzles are calculated using the daisy-chain method.Neural networks are employed to estimate aerodynamic uncertainties,while prediction errors are constructed to design composite update laws.Furthermore,the monitoring mechanism is designed to assist the controller drag flight states back to the boundaries.The uniformly ultimately bounded stability is analysed based on Lyapunov approach.Simulation tests demonstrate that the proposed method provides enhanced tracking performance.展开更多
This paper studies the nature of CPAs＇ audit activities based on neo-institutional economics. CPA auditing is not only a kind of technical activity serving for particular parties, but also systems arrangement for coo...This paper studies the nature of CPAs＇ audit activities based on neo-institutional economics. CPA auditing is not only a kind of technical activity serving for particular parties, but also systems arrangement for coordinate interests conflict in the capital market. The common belief in the elimination and prevention of fraud is the foundation of CPA audit system. Professional auditors and audit organizations possess skills and positions matching the stock market. The incentive of audit fees and the binding force of audit liabilities both guarantee the self-implementation of audit system. Audit reports signal the fairness of accounting information in simplified forms. CPA audit system also has inherent contradictions. The CPA audit activities should be viewed from a system perspective in order that ideas for the perfection of audit activities can be raised from system construction perspective.展开更多
Drought-induced desiccation cracking can trigger several weakening mechanisms in surface soils,potentially precipitating instability and failure of slopes and earthen structures.To investigate the potential applicatio...Drought-induced desiccation cracking can trigger several weakening mechanisms in surface soils,potentially precipitating instability and failure of slopes and earthen structures.To investigate the potential application of distributed fibre optical sensing(DFOS)based on optical frequency domain reflectometry(OFDR)technology in characterizing the twodimensional(2D)desiccation cracking processes of surface soils,a comprehensive test device is utilized to conduct soil evaporation tests,continuously record water content changes,desiccation cracking evolution,and FO sensing strain status.A deep learning-based quantitative analysis method is employed to meticulously examine the relationship between 2D cracking geometric parameters and strain status.The comprehensive analysis not only reveals the mutual feedback response mechanism between the strain status and the soil evaporation-shrinkage-cracking processes,but also clarifies the early detection distance of OFDR technology for 2D desiccation cracking.Specifically,OFDR technology can detect the propagation of horizontal desiccation cracks up to 23 mm in advance with a strain measurement accuracy of 1με.To address the spatial continuity issue in OFDR sensing strain data,an innovative high-resolution characterization framework is proposed by combining the finite element method(FEM)and OFDR technology,referred to as the FEM-OFDR framework.Comparative results indicate that the proposed FEM significantly surpasses both the kriging and radial basis function(RBF)methods in inferring missing OFDR sensing strain data.Notably,during the drying process,reaching a critical water content causes the local decoupling between the uncracked clods and the substrate,resulting in a decreasing trend in the sensing strain at the crack position.This study provides crucial technical means and theoretical support for a deeper understanding of the mechanisms driving 2D desiccation-induced shrinkage and cracking in surface soils.展开更多
Reservoir-induced earthquakes related with the construction of the Three Gorges Project have attracted great concerns of the public. Since the first water impoundment on May 25, 2003, a number of earthquakes have occu...Reservoir-induced earthquakes related with the construction of the Three Gorges Project have attracted great concerns of the public. Since the first water impoundment on May 25, 2003, a number of earthquakes have occurred during the water storage stages, in which the largest was the Badong M5.1 earthquake on December 16, 2013. In this paper, the relationships between seismic activities, b value, seismic parameters, and reservoir water level fluctuations are studied. In addition, based on the digital seismic waveform data obtained since 2000, the focal depth changes and focal mechanism characteristics before and after the water impoundment are studied as well. These provide us important information to understand the earthquake mechanisms. The results show that these earthquakes are typical reservoir-induced earthquakes, which are closely related to water infiltration, pore pressure, and water level fluctuations.The majority of the micro and small earthquakes are caused by karst collapse, mine collapse, bank reformation, superficial unloading, and so on. The larger earthquakes are related to the fault structures to some extent. Due to the persistent effects of water impoundment on the seismic and geological environments around the reservoir and water infiltration into the rocks, the influences on the crustal deformation field, gravity field, seepage field, and fault medium-softening action may vary gradually from a higher strength to a weaker one. Therefore, it is possible that small earthquakes and few medium earthquakes(M≤5.5) will occur in the reservoir area in the future.展开更多
基金supported by the National Natural Science Foundation of China under Grant No 60603035
文摘In web services testing, accessing the interactive contents of measured Services and the information of service condition accurately are the key issues of system design and realization. A non-intrusive solution based on axis2 is presented to overcome the difficulty of the information retrieval in web service testing. It can be plugged in server side or client side freely to test pre-deployed or deployed web services. Moreover, it provides a monitoring interface and the corresponding subscription publication mechanism for users based on web services to support the quality assurance grounded on service-oriented architecture （SOA） application service.
基金supported in part by the Science,Technology and Innovation Commission of Shenzhen Municipality[grant number JCYJ 2023080714550000]in part by the National Natural Science Foundation of China[grant number 62403283].
文摘Considering the characteristics of strong nonlinearity,aerodynamic uncertainty and channel coupling of aircraft at high angle of attack(AOA)maneuvers,this paper studies the robust adaptive control based on monitoring mechanism.By treating channel coupling as part of the total disturbances,the flight dynamics is decomposed into the AOA,sideslip angle and roll rate subsystems.For each subsystem,a robust intelligent controller that utilises error feedback and estimation feedforward is designed to achieve desired control moments.Subsequently,the deflections of aerodynamic control surfaces and thrust vector nozzles are calculated using the daisy-chain method.Neural networks are employed to estimate aerodynamic uncertainties,while prediction errors are constructed to design composite update laws.Furthermore,the monitoring mechanism is designed to assist the controller drag flight states back to the boundaries.The uniformly ultimately bounded stability is analysed based on Lyapunov approach.Simulation tests demonstrate that the proposed method provides enhanced tracking performance.
文摘This paper studies the nature of CPAs＇ audit activities based on neo-institutional economics. CPA auditing is not only a kind of technical activity serving for particular parties, but also systems arrangement for coordinate interests conflict in the capital market. The common belief in the elimination and prevention of fraud is the foundation of CPA audit system. Professional auditors and audit organizations possess skills and positions matching the stock market. The incentive of audit fees and the binding force of audit liabilities both guarantee the self-implementation of audit system. Audit reports signal the fairness of accounting information in simplified forms. CPA audit system also has inherent contradictions. The CPA audit activities should be viewed from a system perspective in order that ideas for the perfection of audit activities can be raised from system construction perspective.
基金supported by the National Natural Science Foundation of China(Grant Nos.41925012,42230710,42172290)the Natural Science Foundation of Jiangsu Province(Grant No.BK20211087)+2 种基金the Key Laboratory Cooperation Special Project of Western Cross Team of Western Light,CAS(Grant No.xbzg-zdsys-202107)the China Scholarship Council(Grant No.202206190069)the Fundamental Research Funds for the Central Universities。
文摘Drought-induced desiccation cracking can trigger several weakening mechanisms in surface soils,potentially precipitating instability and failure of slopes and earthen structures.To investigate the potential application of distributed fibre optical sensing(DFOS)based on optical frequency domain reflectometry(OFDR)technology in characterizing the twodimensional(2D)desiccation cracking processes of surface soils,a comprehensive test device is utilized to conduct soil evaporation tests,continuously record water content changes,desiccation cracking evolution,and FO sensing strain status.A deep learning-based quantitative analysis method is employed to meticulously examine the relationship between 2D cracking geometric parameters and strain status.The comprehensive analysis not only reveals the mutual feedback response mechanism between the strain status and the soil evaporation-shrinkage-cracking processes,but also clarifies the early detection distance of OFDR technology for 2D desiccation cracking.Specifically,OFDR technology can detect the propagation of horizontal desiccation cracks up to 23 mm in advance with a strain measurement accuracy of 1με.To address the spatial continuity issue in OFDR sensing strain data,an innovative high-resolution characterization framework is proposed by combining the finite element method(FEM)and OFDR technology,referred to as the FEM-OFDR framework.Comparative results indicate that the proposed FEM significantly surpasses both the kriging and radial basis function(RBF)methods in inferring missing OFDR sensing strain data.Notably,during the drying process,reaching a critical water content causes the local decoupling between the uncracked clods and the substrate,resulting in a decreasing trend in the sensing strain at the crack position.This study provides crucial technical means and theoretical support for a deeper understanding of the mechanisms driving 2D desiccation-induced shrinkage and cracking in surface soils.
基金supported by the National Natural Science Foundation of China (41572354)the Key Foundation of the Institute of Seismology (IS201616254)
文摘Reservoir-induced earthquakes related with the construction of the Three Gorges Project have attracted great concerns of the public. Since the first water impoundment on May 25, 2003, a number of earthquakes have occurred during the water storage stages, in which the largest was the Badong M5.1 earthquake on December 16, 2013. In this paper, the relationships between seismic activities, b value, seismic parameters, and reservoir water level fluctuations are studied. In addition, based on the digital seismic waveform data obtained since 2000, the focal depth changes and focal mechanism characteristics before and after the water impoundment are studied as well. These provide us important information to understand the earthquake mechanisms. The results show that these earthquakes are typical reservoir-induced earthquakes, which are closely related to water infiltration, pore pressure, and water level fluctuations.The majority of the micro and small earthquakes are caused by karst collapse, mine collapse, bank reformation, superficial unloading, and so on. The larger earthquakes are related to the fault structures to some extent. Due to the persistent effects of water impoundment on the seismic and geological environments around the reservoir and water infiltration into the rocks, the influences on the crustal deformation field, gravity field, seepage field, and fault medium-softening action may vary gradually from a higher strength to a weaker one. Therefore, it is possible that small earthquakes and few medium earthquakes(M≤5.5) will occur in the reservoir area in the future.
