The architecture and working principle of coordinated search and rescue system of unmanned/manned aircraft,which is composed of manned/unmanned aircraft and manned aircraft,were first introduced,and they can cooperate...The architecture and working principle of coordinated search and rescue system of unmanned/manned aircraft,which is composed of manned/unmanned aircraft and manned aircraft,were first introduced,and they can cooperate with each other to complete a search and rescue task.Secondly,a threat assessment method based on meteorological data was proposed,and potential meteorological threats,such as storms and rainfall,can be predicted by collecting and analyzing meteorological data.Finally,an experiment was carried out to evaluate the performance of the proposed method in different scenarios.The experimental results show that the coordinated search and rescue system of unmanned/manned aircraft can be used to effectively assess meteorological threats and provide accurate search and rescue guidance.展开更多
In 2012, the Italian Ministry of Education introduced in the Guidelines for preschool the need to evaluate one aspect of coordination related to the eye-hand relationship. Meinel＇s theoretical model provides an overv...In 2012, the Italian Ministry of Education introduced in the Guidelines for preschool the need to evaluate one aspect of coordination related to the eye-hand relationship. Meinel＇s theoretical model provides an overview of the eye hand coordination, based on capacity to integrate anatomic-functional skills with specific and synchronic hand＇s actions. Meinel＇s model is rich of possible teaching ideas which are consistent with the Italian school system. They might also be a topical theoretical support to choose and use the motor evaluation tests in the Italian preschool, in order to evaluate the eye hand coordination and its constituent elements.展开更多
A healthy ecosystem depends on the coordination of ecosystem structure and function.The coordination among ecosystem components,however,is seldom taken into account in current ecosystem health assessments(EHA).Neglect...A healthy ecosystem depends on the coordination of ecosystem structure and function.The coordination among ecosystem components,however,is seldom taken into account in current ecosystem health assessments(EHA).Neglect of such coordination may lead to large degrees of uncertainty in EHA and fail to support ecosystem management.We propose an approach to quantify the level of dynamic mismatching between ecosystem structure and function and the impact on ecosystem health by incorporating the ecosystem coordination index into EHA.The coordination degree is calculated using variation coefficient of six proxies for ecosystem structure and functions.The ecosystem at Jiaozhou Bay,as a microcosm of China's coast,has been documented to fluctuate from healthy to unhealthy status over the past three decades.The results indicate that there is a 3%-17% lower health level than that calculated by common methods used in the literature,indicating that the health of Jiaozhou Bay has become worse than expected.Habitat change contributes 20%-52% to ecosystem mismatches and is the most uncoordinated factor.Mismatch-related declines account for approximately one-fourth of the total ecological declines.Restoration scenarios that aim to resolve ecosystem mismatches could increase efficiency by about 50% compared to restoration scenarios that do not consider mismatches.This study investigates ecological declines in a coastal bay due to 30 years of rapid economic development.In doing so,this study provides novel insights and enhances our understanding of the reasons for failure in ecological restoration.展开更多
New strategies and methods for assessing the security of protection systems to reduce the risk of unnecessary disturbances and blackouts are the main topic of the present paper. The system behavior of a protection sys...New strategies and methods for assessing the security of protection systems to reduce the risk of unnecessary disturbances and blackouts are the main topic of the present paper. The system behavior of a protection system and network is analyzed and assessed as a whole. Hence, the established algorithms are capable to handle complex network structures with regard to an intelligent data management as well as data validation. Protection security assessment comprised two different aspects: on the one hand the behavior regarding dependability and security in terms of speed and sensitivity, on the other hand the behavior regarding the response on dynamic network phenomena as voltage stability and transient stability. A new automated method for assessing the dependability and security of protection systems is shown. The short-circuit simulation tool is used to provide a simulation system including network and protection devices as a whole. The handling of the large amount of resulting data is done by an intelligent visualization method like a “fingerprint” analysis. Further on the paper is focused on the protection response on dynamic network phenomena and presents innovative strategies for this investigation aspect. The structure of simulation environment will be described. Results of a case study show the application of this method on a real network. The system tool which is concluding these two aspects of protection assessment is called SIGUARD? PSA.展开更多
故障限流是保障直流输电系统安全运行的关键技术,现有源侧和网侧限流方法通常独立配置且未与故障严重程度相匹配,难以兼顾限流能力与设备成本。针对上述问题,该文提出一种考虑故障严重程度的源网自适应限流策略,利用源侧模块化多电平换...故障限流是保障直流输电系统安全运行的关键技术,现有源侧和网侧限流方法通常独立配置且未与故障严重程度相匹配,难以兼顾限流能力与设备成本。针对上述问题,该文提出一种考虑故障严重程度的源网自适应限流策略,利用源侧模块化多电平换流器(modular multilevel converter,MMC)与网侧故障限流器(fault current limiter,FCL)的限流贡献度配合,实现主动匹配限流目标和故障条件的自适应限流。能够在保障限流能力的前提下,降低FCL配置成本及MMC降压运行对电网的不利影响。首先,分别定量分析源侧MMC与网侧FCL的限流贡献度,进而推导考虑限流贡献度配合的源网协同限流计算方法;基于此提出限流贡献度匹配故障严重程度的自适应故障限流策略;最后,在电磁暂态仿真中对所提策略的有效性进行验证。展开更多
火灾事故频繁发生,做好火灾受损评估工作,有助于查明起火原因、损失核定、灾后修复等工作顺利开展。针对火灾勘验墙体受损评估中存在的速度慢、结果不够准确、过于依赖个人经验等问题,提出了一种墙体火灾受损程度智能评估方法(YOLOv5-wa...火灾事故频繁发生,做好火灾受损评估工作,有助于查明起火原因、损失核定、灾后修复等工作顺利开展。针对火灾勘验墙体受损评估中存在的速度慢、结果不够准确、过于依赖个人经验等问题,提出了一种墙体火灾受损程度智能评估方法(YOLOv5-wall damage assessment,YWDA)。该方法基于YOLOv5(you only look once v5)网络进行改进,首先在加强特征提取网络插入坐标注意力(coordinate attention,CA)机制模块,提高了网络对墙体火灾受损特征的检测能力;其次,在损失函数中引入Focal loss,缓解了数据样本不平衡的问题。结合火灾勘验现场全景三维模型,建立一个居民住宅火灾受损评估数据集,并在此数据集上进行实验验证。结果表明:所提方法YWDA相较于其他算法,具有速度快、精度高、模型小等优点,在实际评估任务中具有较强的鲁棒性。因此,所提方法满足墙体火灾受损评估任务高效性、准确性、客观性等要求,可为现代化火灾勘验工作提供技术支持。展开更多
基金the Study on the Impact of the Construction and Development of Southwest Plateau Airport on the Ecological Environment(CZKY2023032).
文摘The architecture and working principle of coordinated search and rescue system of unmanned/manned aircraft,which is composed of manned/unmanned aircraft and manned aircraft,were first introduced,and they can cooperate with each other to complete a search and rescue task.Secondly,a threat assessment method based on meteorological data was proposed,and potential meteorological threats,such as storms and rainfall,can be predicted by collecting and analyzing meteorological data.Finally,an experiment was carried out to evaluate the performance of the proposed method in different scenarios.The experimental results show that the coordinated search and rescue system of unmanned/manned aircraft can be used to effectively assess meteorological threats and provide accurate search and rescue guidance.
文摘In 2012, the Italian Ministry of Education introduced in the Guidelines for preschool the need to evaluate one aspect of coordination related to the eye-hand relationship. Meinel＇s theoretical model provides an overview of the eye hand coordination, based on capacity to integrate anatomic-functional skills with specific and synchronic hand＇s actions. Meinel＇s model is rich of possible teaching ideas which are consistent with the Italian school system. They might also be a topical theoretical support to choose and use the motor evaluation tests in the Italian preschool, in order to evaluate the eye hand coordination and its constituent elements.
基金supported by the National Natural Science Foundation of China–Shandong Joint Fund of Marine Science Research Centers of China(No.U1406403)the NSFC(No.41306100)the Scientific Research Foundation of Guangxi University(No.XGZ 160281)
文摘A healthy ecosystem depends on the coordination of ecosystem structure and function.The coordination among ecosystem components,however,is seldom taken into account in current ecosystem health assessments(EHA).Neglect of such coordination may lead to large degrees of uncertainty in EHA and fail to support ecosystem management.We propose an approach to quantify the level of dynamic mismatching between ecosystem structure and function and the impact on ecosystem health by incorporating the ecosystem coordination index into EHA.The coordination degree is calculated using variation coefficient of six proxies for ecosystem structure and functions.The ecosystem at Jiaozhou Bay,as a microcosm of China's coast,has been documented to fluctuate from healthy to unhealthy status over the past three decades.The results indicate that there is a 3%-17% lower health level than that calculated by common methods used in the literature,indicating that the health of Jiaozhou Bay has become worse than expected.Habitat change contributes 20%-52% to ecosystem mismatches and is the most uncoordinated factor.Mismatch-related declines account for approximately one-fourth of the total ecological declines.Restoration scenarios that aim to resolve ecosystem mismatches could increase efficiency by about 50% compared to restoration scenarios that do not consider mismatches.This study investigates ecological declines in a coastal bay due to 30 years of rapid economic development.In doing so,this study provides novel insights and enhances our understanding of the reasons for failure in ecological restoration.
文摘New strategies and methods for assessing the security of protection systems to reduce the risk of unnecessary disturbances and blackouts are the main topic of the present paper. The system behavior of a protection system and network is analyzed and assessed as a whole. Hence, the established algorithms are capable to handle complex network structures with regard to an intelligent data management as well as data validation. Protection security assessment comprised two different aspects: on the one hand the behavior regarding dependability and security in terms of speed and sensitivity, on the other hand the behavior regarding the response on dynamic network phenomena as voltage stability and transient stability. A new automated method for assessing the dependability and security of protection systems is shown. The short-circuit simulation tool is used to provide a simulation system including network and protection devices as a whole. The handling of the large amount of resulting data is done by an intelligent visualization method like a “fingerprint” analysis. Further on the paper is focused on the protection response on dynamic network phenomena and presents innovative strategies for this investigation aspect. The structure of simulation environment will be described. Results of a case study show the application of this method on a real network. The system tool which is concluding these two aspects of protection assessment is called SIGUARD? PSA.
文摘故障限流是保障直流输电系统安全运行的关键技术,现有源侧和网侧限流方法通常独立配置且未与故障严重程度相匹配,难以兼顾限流能力与设备成本。针对上述问题,该文提出一种考虑故障严重程度的源网自适应限流策略,利用源侧模块化多电平换流器(modular multilevel converter,MMC)与网侧故障限流器(fault current limiter,FCL)的限流贡献度配合,实现主动匹配限流目标和故障条件的自适应限流。能够在保障限流能力的前提下,降低FCL配置成本及MMC降压运行对电网的不利影响。首先,分别定量分析源侧MMC与网侧FCL的限流贡献度,进而推导考虑限流贡献度配合的源网协同限流计算方法;基于此提出限流贡献度匹配故障严重程度的自适应故障限流策略;最后,在电磁暂态仿真中对所提策略的有效性进行验证。
文摘火灾事故频繁发生,做好火灾受损评估工作,有助于查明起火原因、损失核定、灾后修复等工作顺利开展。针对火灾勘验墙体受损评估中存在的速度慢、结果不够准确、过于依赖个人经验等问题,提出了一种墙体火灾受损程度智能评估方法(YOLOv5-wall damage assessment,YWDA)。该方法基于YOLOv5(you only look once v5)网络进行改进,首先在加强特征提取网络插入坐标注意力(coordinate attention,CA)机制模块,提高了网络对墙体火灾受损特征的检测能力;其次,在损失函数中引入Focal loss,缓解了数据样本不平衡的问题。结合火灾勘验现场全景三维模型,建立一个居民住宅火灾受损评估数据集,并在此数据集上进行实验验证。结果表明:所提方法YWDA相较于其他算法,具有速度快、精度高、模型小等优点,在实际评估任务中具有较强的鲁棒性。因此,所提方法满足墙体火灾受损评估任务高效性、准确性、客观性等要求,可为现代化火灾勘验工作提供技术支持。
