Search

With the growth of Internet multimedia data,text image retrieval has become a research hotspot.In image and text retrieval,the mutual attention mechanism is used to achieve better image-text matching results by interacting image and text features.However,this method cannot obtain image features and text features separately,and requires interaction of image and text features in the later stage of large-scale retrieval,which consumes a lot of time and is not able to achieve fast retrieval and ma-tching.However,the cross-modal image text feature learning based on Transformer has achieved good results and has received more and more attention from researchers.This paper designs a novel Transformer-based text image retrieval network structure(HAS-Net),which mainly has the following improvements:a hierarchical Transformer coding structure is designed to better utilize the underlying grammatical information and high-level semantic information;the traditional global feature aggregation method is improved,and the self-attention mechanism is used to design a new feature aggregation method;by sharing the Transformer coding layer,image features and text features are mapped to a common feature coding space.Finally,experiments are conducted on the MS-COCO and Flickr30k datasets,the cross-modal retrieval performance has been improved,and it is in a leading position among similar algorithms.It is proved that the designed network structure is effective.

High lift system is one of the key systems to ensure aircraft flight safety, so its safety and reliability are highly required.In the development of high lift system, the application of less mature technology will increase the development risk.Combined with engineering data, on the basis of airworthiness safety design and analysis methods, a development technology is established.Taking a civil aircraft high lift system as an example, the risk identification method identifies the technical risks affecting its safety, and gives the technical improvement method and risk control strategy.The results show that there are risks in the non-commanded down of the flap and the non-commanded retract of the flap in a high lift system of a civil aircraft.By reducing the failure probability of the control channel and the monitor channel module of the flap electronic control unit, the failure probability of the non-command down/retract of the flap can be reduced from 1.656×10-9/fh to 9.424×10-10/fh, which meets the system safety requirements and avoids risks.