物联网(Internet of Things,IoT)是一种通过各种接入技术将海量电子设备与互联网进行互联的大规模虚拟网络,包括RFID、传感器以及执行器的电子设备通过互联网互联互通,将异构信息汇聚后共同完成某项特定的任务。为了解决物联网规模化运...物联网(Internet of Things,IoT)是一种通过各种接入技术将海量电子设备与互联网进行互联的大规模虚拟网络,包括RFID、传感器以及执行器的电子设备通过互联网互联互通,将异构信息汇聚后共同完成某项特定的任务。为了解决物联网规模化运用中的关键技术,首先探讨了物联网与这些网络的区别,给出了物联网的定义、特征以及参考架构。同时,创新性地提出了区域服务器的概念,并通过本体论知识表达等方法的运用解决了物联网中的"信息孤岛"难题。智能信息处理是物联网的核心内容之一,而物联网的知识表达与情景感知等相关技术是物联网智能信息处理的核心内容。据此,着重分析研究了智能信息处理的信息空间定义、信息量化方法以及信息处理各阶段的主要问题及相应的解决办法。展开更多
Global Earth Observing System of Systems(GEOSS)presents a great challenge of System of Systems integration across organisational and political boundaries.One existing paradigm that can address the scale of the challen...Global Earth Observing System of Systems(GEOSS)presents a great challenge of System of Systems integration across organisational and political boundaries.One existing paradigm that can address the scale of the challenge is that of the Sensor Web.In this paradigm,the internet is evolving into an active,macro sensing instrument,capable of drawing sensory data from around the globe to the fingertips of individuals.The Sensor Web will support scientific research and facilitate transparent political decision making.This article presents some of the technologies explored and activities engaged in by the GEOSS Sensor Web community,towards achieving GEOSS goals.展开更多
Reconfigurable devices can be used to achieve multiple logic operation and intelligent optical sensing with low power consumption,which is promising candidates for new generation electronic and optoelectronic integrat...Reconfigurable devices can be used to achieve multiple logic operation and intelligent optical sensing with low power consumption,which is promising candidates for new generation electronic and optoelectronic integrated circuits.However,the versatility is still limited and need to be extended by the device architectures design.Here,we report an asymmetrically gate two-dimensional(2D)van der Waals heterostructure with hybrid dielectric layer SiO_(2)/hexagonal boron nitride(h-BN),which enable rich function including reconfigurable logic operation and in-sensor information encryption enabled by both volatile and non-volatile optoelectrical modulation.When the partial gate is grounded,the non-volatile light assisted electrostatic doping endowed partially reconfigurable doping between n-type and p-type,which allow the switching of logic XOR and not implication(NIMP).When the global gate is grounded,additionally taking the optical signal as another input signal,logic AND and OR is realized by combined regulation of the light and localized gate voltage.Depending on the high on/off current ratio approaching 105 and reliable&switchable logic gate,in-sensor information encryption and decryption is demonstrated by manipulating the logic output.Hence,these results provide strong extension for current reconfigurable electronic and optoelectronic devices.展开更多
文摘物联网(Internet of Things,IoT)是一种通过各种接入技术将海量电子设备与互联网进行互联的大规模虚拟网络,包括RFID、传感器以及执行器的电子设备通过互联网互联互通,将异构信息汇聚后共同完成某项特定的任务。为了解决物联网规模化运用中的关键技术,首先探讨了物联网与这些网络的区别,给出了物联网的定义、特征以及参考架构。同时,创新性地提出了区域服务器的概念,并通过本体论知识表达等方法的运用解决了物联网中的"信息孤岛"难题。智能信息处理是物联网的核心内容之一,而物联网的知识表达与情景感知等相关技术是物联网智能信息处理的核心内容。据此,着重分析研究了智能信息处理的信息空间定义、信息量化方法以及信息处理各阶段的主要问题及相应的解决办法。
文摘Global Earth Observing System of Systems(GEOSS)presents a great challenge of System of Systems integration across organisational and political boundaries.One existing paradigm that can address the scale of the challenge is that of the Sensor Web.In this paradigm,the internet is evolving into an active,macro sensing instrument,capable of drawing sensory data from around the globe to the fingertips of individuals.The Sensor Web will support scientific research and facilitate transparent political decision making.This article presents some of the technologies explored and activities engaged in by the GEOSS Sensor Web community,towards achieving GEOSS goals.
基金supported by the Beijing Natural Science Foundation(No.JQ20027)the National Science Foundation of China(No.62305013)+2 种基金China Postdoctoral Science Foundation(No.2023M730137)the China National Postdoctoral Program for Innovative Talents(No.BX20230033)Beijing Postdoctoral Research Foundation(No.2023-zz-95).
文摘Reconfigurable devices can be used to achieve multiple logic operation and intelligent optical sensing with low power consumption,which is promising candidates for new generation electronic and optoelectronic integrated circuits.However,the versatility is still limited and need to be extended by the device architectures design.Here,we report an asymmetrically gate two-dimensional(2D)van der Waals heterostructure with hybrid dielectric layer SiO_(2)/hexagonal boron nitride(h-BN),which enable rich function including reconfigurable logic operation and in-sensor information encryption enabled by both volatile and non-volatile optoelectrical modulation.When the partial gate is grounded,the non-volatile light assisted electrostatic doping endowed partially reconfigurable doping between n-type and p-type,which allow the switching of logic XOR and not implication(NIMP).When the global gate is grounded,additionally taking the optical signal as another input signal,logic AND and OR is realized by combined regulation of the light and localized gate voltage.Depending on the high on/off current ratio approaching 105 and reliable&switchable logic gate,in-sensor information encryption and decryption is demonstrated by manipulating the logic output.Hence,these results provide strong extension for current reconfigurable electronic and optoelectronic devices.
