To support the rapid automatic services composition and fulfill multi-quality of service （multi- QoS） demand, we propose a novel approach to realize services composition automatically by a prefihering process. Aimed...To support the rapid automatic services composition and fulfill multi-quality of service （multi- QoS） demand, we propose a novel approach to realize services composition automatically by a prefihering process. Aimed at a set of web services with similar functionality and different quality of service （QoS） , a semantic services chain is given and a corresponding constructing algorithm is proposed to construct the data structure. A pre-filtering process is put forward to find whether a composition service before planning exists. It can avoid aborted planning. An optimal planning algorithm is proposed which can choose the most suitable service from a lot of similar candidate services based on semantic service chains and multi-QoS values. The algorithms can improve the correctness and automation performances of automated semantic web services composition. As an example, a concrete composite process is analyzed. Experimental results show the validity of the composite process.展开更多
The sterile insect technique(SIT)for controlling the Mediterranean fruit fly,Ceratitis capitata(Wiedemann),requires the mass-rearing of males in bio-facilities.This study summarizes the implementation of a Pre-Filter ...The sterile insect technique(SIT)for controlling the Mediterranean fruit fly,Ceratitis capitata(Wiedemann),requires the mass-rearing of males in bio-facilities.This study summarizes the implementation of a Pre-Filter system in the mass-rearing process of C.capitata at the Moscamed program's El Pino facility in Guatemala.The Pre-Filter selection process as presented here was aimed to increase the longevity of the VIENNA 8 D53-strain males released for pest control.Over a 9-year period(2015–2024),the longevity of these males was systemically monitored,and the impact of the Pre-Filter system on mortality,half-life,and survival rate were analyzed.Results indicated a significant reduction in mortality at 48 h,declining from 16.47%in 2017 to 2.56%in 2024.Concurrently,the half-life of males increased from 79.55 h in 2018 to 85.97 h in 2024.The Pre-Filter system shifted the frequency distribution of half-lives toward longer durations,with a peak observed between 76.14 and 86.14 h,whereas populations without the Pre-Filter exhibited shorter half-lives,peaking between 56.14 and 66.14 h.Comparative analyses with historical data(2005–2024)demonstrated that the Pre-Filter system significantly improved the male longevity,compared to pre-implementation periods during which mortality rates were higher and more variable.Additionally,the results revealed a gradual reduction in longevity variability within the population,indicating a more homogeneous longevity among the mass-reared males.展开更多
In order to ease the pass-band response distortion of the matrix pre-filter,a simple approach for designing matrix spatial filter is proposed,which minimizes the sum of the k maximal distortion norm（k is the number o...In order to ease the pass-band response distortion of the matrix pre-filter,a simple approach for designing matrix spatial filter is proposed,which minimizes the sum of the k maximal distortion norm（k is the number of the constraint points）within the pass-band,while constraining the filter response within the stop-band.Considering the costly amount of calculation of the high-resolution methods,an algorithm with small amount of calculation based on matrix pre-filtering and subspace fitting using acoustic vector array（MF-VSSF）is proposed.Through joint processing of signal subspace of both pressure and particle velocity,the pre-filtering matrix and the signal subspace is decreased to M-dimensional（M is the number of array-element）,hence reduces the time-consumption of the matrix pre-filter design and DOA searching.Simulation results show that,the method offers the same performance as MUSIC with pre-filtering,but has much lesser amount of calculation.Moreover,the designed prefilter can efficiently suppress the interference in the stop-band and improve the estimation and resolution performance of successive DOA estimators.展开更多
In response to the complex working conditions of the power grid caused by the high proportion of new energy access,which leads to insufficient output accuracy of the second-order generalized integrator(SOGI)phaselocke...In response to the complex working conditions of the power grid caused by the high proportion of new energy access,which leads to insufficient output accuracy of the second-order generalized integrator(SOGI)phaselocked loop,this article proposes an improved frequency adaptive phase-locked loop structure for SOGI.Firstly,an amplitude compensation branch is introduced to compensate for the SOGI tracking fundamental frequency signal,ensuring the accuracy of the SOGI output orthogonal signal under frequency fluctuation conditions.Secondly,by cascading two adaptive SOGI modules,the suppression capability of low-order harmonics and Direct Current(DC)components has been improved.Finally,the positive and negative sequence separation method of orthogonal signals is introduced to eliminate the influence of unbalanced components on the phase-locked loop.The comparative experiment with the classic SOGI-PLL method shows that the proposed phase-locked loop structure effectively improves the accuracy of power grid synchronization detection under complex working conditions such as harmonic components,unbalanced components,and frequency fluctuations.It can complete frequency detection within 1.5 power frequency cycles,and the detected fundamental frequency positive sequence voltage has a higher sinuosity and harmonic distortion rate within 0.5%.展开更多
基金Supported by the National Natural Science Foundation of China （No. 61201252, 60775037） , Humanities and Social Sciences Foundation of the Ministry of Education （No. 10YJC870046 ）, Natural Science Research Key Project of Anhui Provincial Higher Education （No. KJ2011 A128） , Soft Science Project of Anhui Province （ No. 11020503009）.
文摘To support the rapid automatic services composition and fulfill multi-quality of service （multi- QoS） demand, we propose a novel approach to realize services composition automatically by a prefihering process. Aimed at a set of web services with similar functionality and different quality of service （QoS） , a semantic services chain is given and a corresponding constructing algorithm is proposed to construct the data structure. A pre-filtering process is put forward to find whether a composition service before planning exists. It can avoid aborted planning. An optimal planning algorithm is proposed which can choose the most suitable service from a lot of similar candidate services based on semantic service chains and multi-QoS values. The algorithms can improve the correctness and automation performances of automated semantic web services composition. As an example, a concrete composite process is analyzed. Experimental results show the validity of the composite process.
文摘The sterile insect technique(SIT)for controlling the Mediterranean fruit fly,Ceratitis capitata(Wiedemann),requires the mass-rearing of males in bio-facilities.This study summarizes the implementation of a Pre-Filter system in the mass-rearing process of C.capitata at the Moscamed program's El Pino facility in Guatemala.The Pre-Filter selection process as presented here was aimed to increase the longevity of the VIENNA 8 D53-strain males released for pest control.Over a 9-year period(2015–2024),the longevity of these males was systemically monitored,and the impact of the Pre-Filter system on mortality,half-life,and survival rate were analyzed.Results indicated a significant reduction in mortality at 48 h,declining from 16.47%in 2017 to 2.56%in 2024.Concurrently,the half-life of males increased from 79.55 h in 2018 to 85.97 h in 2024.The Pre-Filter system shifted the frequency distribution of half-lives toward longer durations,with a peak observed between 76.14 and 86.14 h,whereas populations without the Pre-Filter exhibited shorter half-lives,peaking between 56.14 and 66.14 h.Comparative analyses with historical data(2005–2024)demonstrated that the Pre-Filter system significantly improved the male longevity,compared to pre-implementation periods during which mortality rates were higher and more variable.Additionally,the results revealed a gradual reduction in longevity variability within the population,indicating a more homogeneous longevity among the mass-reared males.
基金supported by the National Natural Science Foundation of China(61201411)
文摘In order to ease the pass-band response distortion of the matrix pre-filter,a simple approach for designing matrix spatial filter is proposed,which minimizes the sum of the k maximal distortion norm（k is the number of the constraint points）within the pass-band,while constraining the filter response within the stop-band.Considering the costly amount of calculation of the high-resolution methods,an algorithm with small amount of calculation based on matrix pre-filtering and subspace fitting using acoustic vector array（MF-VSSF）is proposed.Through joint processing of signal subspace of both pressure and particle velocity,the pre-filtering matrix and the signal subspace is decreased to M-dimensional（M is the number of array-element）,hence reduces the time-consumption of the matrix pre-filter design and DOA searching.Simulation results show that,the method offers the same performance as MUSIC with pre-filtering,but has much lesser amount of calculation.Moreover,the designed prefilter can efficiently suppress the interference in the stop-band and improve the estimation and resolution performance of successive DOA estimators.
基金supported by the Science and Technology Project of China Southern Power Grid Co.,Ltd.(Grant No.ZBKJXM20232471)the National Key R&D Program of China(Grant No.2021YFB1600200)the Innovation Capability Support Program of Shaanxi(Grant No.2022KXJ-144)。
文摘In response to the complex working conditions of the power grid caused by the high proportion of new energy access,which leads to insufficient output accuracy of the second-order generalized integrator(SOGI)phaselocked loop,this article proposes an improved frequency adaptive phase-locked loop structure for SOGI.Firstly,an amplitude compensation branch is introduced to compensate for the SOGI tracking fundamental frequency signal,ensuring the accuracy of the SOGI output orthogonal signal under frequency fluctuation conditions.Secondly,by cascading two adaptive SOGI modules,the suppression capability of low-order harmonics and Direct Current(DC)components has been improved.Finally,the positive and negative sequence separation method of orthogonal signals is introduced to eliminate the influence of unbalanced components on the phase-locked loop.The comparative experiment with the classic SOGI-PLL method shows that the proposed phase-locked loop structure effectively improves the accuracy of power grid synchronization detection under complex working conditions such as harmonic components,unbalanced components,and frequency fluctuations.It can complete frequency detection within 1.5 power frequency cycles,and the detected fundamental frequency positive sequence voltage has a higher sinuosity and harmonic distortion rate within 0.5%.
