The modern aircraft Thermal Management System(TMS)faces significant challenges due to increasing thermal loads and limited heat dissipation pathways.To optimize TMS during the conceptual design stage,the development o...The modern aircraft Thermal Management System(TMS)faces significant challenges due to increasing thermal loads and limited heat dissipation pathways.To optimize TMS during the conceptual design stage,the development of a modeling and simulation tool is crucial.In this study,a TMS simulation model library was created using MATLAB/SIMULINK.To simplify the complexity of the Vapor Cycle System(VCS)model,a Response Surface Model(RSM)was constructed using the Monte Carlo method and validated through simulation experiments.Taking the F-22 fighter TMS as an example,a thermal dynamic simulation model was constructed to analyze the variation of thermal response parameters in key subsystems and elucidate their coupling relationships.Furthermore,the impact of total fuel flow and ram air flow on the TMS was investigated.The findings demonstrate the existence of an optimal total fuel flow that achieves a balance between maximizing fuel heat sink utilization and minimizing bleed air demand.The adaptive distribution of fuel and ram air flow was found to enhance aircraft thermal management performance.This study contributes to improving modeling efficiency and enhancing the understanding of the thermal dynamic characteristics of TMS,thereby facilitating further optimization in aircraft TMS design.展开更多
The rapid development of large language models(LLMs)has opened new avenues across various fields,including cybersecurity,which faces an evolving threat landscape and demand for innovative technologies.Despite initial ...The rapid development of large language models(LLMs)has opened new avenues across various fields,including cybersecurity,which faces an evolving threat landscape and demand for innovative technologies.Despite initial explorations into the application of LLMs in cybersecurity,there is a lack of a comprehensive overview of this research area.This paper addresses this gap by providing a systematic literature review,covering the analysis of over 300 works,encompassing 25 LLMs and more than 10 downstream scenarios.Our comprehensive overview addresses three key research questions:the construction of cybersecurity-oriented LLMs,the application of LLMs to various cybersecurity tasks,the challenges and further research in this area.This study aims to shed light on the extensive potential of LLMs in enhancing cybersecurity practices and serve as a valuable resource for applying LLMs in this field.We also maintain and regularly update a list of practical guides on LLMs for cybersecurity at https://github.com/tmylla/Aweso me-LLM4C ybers ecurity.展开更多
A double-zone aspheric diffractive intraocular lens （IOL） was designed and manufactured aiming to regain a continuous range of clear vision for pseudophakic presbyopia. After obtaining the IOL structure parameters t...A double-zone aspheric diffractive intraocular lens （IOL） was designed and manufactured aiming to regain a continuous range of clear vision for pseudophakic presbyopia. After obtaining the IOL structure parameters through optimization based on an aphakic model eye, its imaging performances were analyzed in the model eye. The modulation transfer function at 50 cycles/mm remained above 0.29 within ±5° field of view for object distance ranging from 6 to 0.66 m. In addition, the imaging qualities are robust for pupil changes, polychromatic light, and different corneal asphericities. The manufactured IOL exhibits the abilitv to extend depth of focus.展开更多
文摘The modern aircraft Thermal Management System(TMS)faces significant challenges due to increasing thermal loads and limited heat dissipation pathways.To optimize TMS during the conceptual design stage,the development of a modeling and simulation tool is crucial.In this study,a TMS simulation model library was created using MATLAB/SIMULINK.To simplify the complexity of the Vapor Cycle System(VCS)model,a Response Surface Model(RSM)was constructed using the Monte Carlo method and validated through simulation experiments.Taking the F-22 fighter TMS as an example,a thermal dynamic simulation model was constructed to analyze the variation of thermal response parameters in key subsystems and elucidate their coupling relationships.Furthermore,the impact of total fuel flow and ram air flow on the TMS was investigated.The findings demonstrate the existence of an optimal total fuel flow that achieves a balance between maximizing fuel heat sink utilization and minimizing bleed air demand.The adaptive distribution of fuel and ram air flow was found to enhance aircraft thermal management performance.This study contributes to improving modeling efficiency and enhancing the understanding of the thermal dynamic characteristics of TMS,thereby facilitating further optimization in aircraft TMS design.
基金supported by the Strategic Priority Research Programr of Chinese Academy of Sciences,the System of Cybersecurity Large Model.
文摘The rapid development of large language models(LLMs)has opened new avenues across various fields,including cybersecurity,which faces an evolving threat landscape and demand for innovative technologies.Despite initial explorations into the application of LLMs in cybersecurity,there is a lack of a comprehensive overview of this research area.This paper addresses this gap by providing a systematic literature review,covering the analysis of over 300 works,encompassing 25 LLMs and more than 10 downstream scenarios.Our comprehensive overview addresses three key research questions:the construction of cybersecurity-oriented LLMs,the application of LLMs to various cybersecurity tasks,the challenges and further research in this area.This study aims to shed light on the extensive potential of LLMs in enhancing cybersecurity practices and serve as a valuable resource for applying LLMs in this field.We also maintain and regularly update a list of practical guides on LLMs for cybersecurity at https://github.com/tmylla/Aweso me-LLM4C ybers ecurity.
基金supported by the National Natural Science Foundation of China(No.11474172)
文摘A double-zone aspheric diffractive intraocular lens （IOL） was designed and manufactured aiming to regain a continuous range of clear vision for pseudophakic presbyopia. After obtaining the IOL structure parameters through optimization based on an aphakic model eye, its imaging performances were analyzed in the model eye. The modulation transfer function at 50 cycles/mm remained above 0.29 within ±5° field of view for object distance ranging from 6 to 0.66 m. In addition, the imaging qualities are robust for pupil changes, polychromatic light, and different corneal asphericities. The manufactured IOL exhibits the abilitv to extend depth of focus.
