A model of autonomous positioning through associating environment memory information is presented for unmanned combat aerial vehicle(UCAV).The representation strategy of environment by constructing place cells is used...A model of autonomous positioning through associating environment memory information is presented for unmanned combat aerial vehicle(UCAV).The representation strategy of environment by constructing place cells is used to produce the memory information,and the landmarks in memory are retrieved through perceiving and processing the environment.During UCAV′s flight,the landmarks are obtained in real-time and are matched with the landmarks in memory.Then,the idea of ranging positioning is adopted to calculate UCAV′s location based on the corresponding relationship between current obtained landmarks and the memorized landmarks.Simulation shows that the proposed model can realize autonomous positioning in the memorized environment,and the positioning performance is well when the sensor has a high precision.展开更多
Plants grow in dynamic environments where they receive diverse environmental signals.Swift and precise control of gene expression is essential for plants to align their development and metabolism with fluctuating surr...Plants grow in dynamic environments where they receive diverse environmental signals.Swift and precise control of gene expression is essential for plants to align their development and metabolism with fluctuating surroundings.Modifications on histones serve as histone code" to specify chromatin and gene activities.Different modifications execute distinct functions on the chromatin,promoting either active transcription or gene silencing.Histone writers,erasers,and readers mediate the regulation of histone modifications by catalyzing,removing,and recognizing modifications,respectively.Growing evidence indicates the important function of histone modifications in plant development and environmental responses.Histone modifications also serve as environmental memory for plants to adapt to environmental changes.Here we review recent progress on the regulation of histone modifications in plants,the impact of histone modifications on environment-controlled developmental transitions including germination and flowering,and the role of histone modifications in environmental memory.展开更多
基金supported by the National Natural Science Foundation of China(No.61273048)
文摘A model of autonomous positioning through associating environment memory information is presented for unmanned combat aerial vehicle(UCAV).The representation strategy of environment by constructing place cells is used to produce the memory information,and the landmarks in memory are retrieved through perceiving and processing the environment.During UCAV′s flight,the landmarks are obtained in real-time and are matched with the landmarks in memory.Then,the idea of ranging positioning is adopted to calculate UCAV′s location based on the corresponding relationship between current obtained landmarks and the memorized landmarks.Simulation shows that the proposed model can realize autonomous positioning in the memorized environment,and the positioning performance is well when the sensor has a high precision.
基金supported by the startup funding from State Key Laboratory of Plant Genomics and Institute of Genetics and Developmental Biology,Chinese Academy of Sciences
文摘Plants grow in dynamic environments where they receive diverse environmental signals.Swift and precise control of gene expression is essential for plants to align their development and metabolism with fluctuating surroundings.Modifications on histones serve as histone code" to specify chromatin and gene activities.Different modifications execute distinct functions on the chromatin,promoting either active transcription or gene silencing.Histone writers,erasers,and readers mediate the regulation of histone modifications by catalyzing,removing,and recognizing modifications,respectively.Growing evidence indicates the important function of histone modifications in plant development and environmental responses.Histone modifications also serve as environmental memory for plants to adapt to environmental changes.Here we review recent progress on the regulation of histone modifications in plants,the impact of histone modifications on environment-controlled developmental transitions including germination and flowering,and the role of histone modifications in environmental memory.
