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Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In response to the issue of poor performance of external knowledge-based visual question answering tasks, a framework is constructed for external knowledge-based visual question answering (VQA) models that integrated cross-modal Transformers. By introducing an external knowledge base outside the VQA model, the inference ability of the VQA model on external knowledge-based tasks was improved. Further, the model utilized a bidirectional cross attention mechanism to enhance the semantic interactive and fusion ability of text problems, images, and in order to optimize the problem of insufficient reasoning ability commonly found in VQA models in the face of external knowledge. The results show that compared with the baseline model LXMERT, the overall performance index of the proposed model overall improves by 15. 01% on the OK VQA dataset. Meanwhile, compared with the existing latest model, the overall performance index of the proposed model overall improves by 4. 46% on the OK VQA dataset. It can be seen that the proposed model improves the performance of external knowledge-based VQA tasks. [ABSTRACT FROM AUTHOR]

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to determine the apron U-zone spatial efficiency assessment index system and the importance of its indexes, the evaluation index system of apron U-zone spatial efficiency was established from two dimensions of apron design and apron operation. Based on this, a spatial efficiency assessment method based on the paradigm gray correlation-dynamic efficacy coefficient method for apron U-zones was proposed. And the U-zone apron corresponding to the terminal buildings of 10 domestic large-scale transportation airports was calculated as an example, and the weights of each index affecting the spatial efficiency of the apron's U-zone were obtained as well as the spatial efficiency scores of the U-zone apron corresponding to the terminal buildings of each airport. It is proposed that three indexes should be emphasized in the design of U-zone, including the number of gates at the edge of the finger corridor, the depth of the finger corridor and the length of the bottom edge of the U-zone. The results show that this method can scientifically analyze the factors affecting the spatial efficiency of the apron U-zone, effectively judge the spatial efficiency of the U-zone in different configurations. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Technology Economics is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to provide theoretical basis for developing and optimizing aircraft surface operation strategies for close range parallel runway airports, improve the safety and efficiency of runway operation, reduce airport operation surface conflicts, and reduce safety hazards. Based on the goal of the minimum average ground taxiing time for inbound and outbound flights, an operation strategy model of the end-around taxiway (EAT) was analyzed and established. The feasibility of the model was verified by performing both numerical calculations and software simulations run by AirTOp software using two close parallel runways at an airport with the EAT as an example. The results of the numerical calculations show that the EAT strategies determined by the model can simultaneously reduce the delay level of inbound and outbound flights and improve ground taxiing efficiency. Through further study on the flight operation data of the airport demonstrates that a more obvious positive correlation exists between takeoff runway traffic density and the EAT utilization rate. Therefore, a EAT operation strategy was proposed for this airport under peak hourly operating sorties and variations in takeoff / landing ratios. [ABSTRACT FROM AUTHOR]

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

For the complex layout of large civil transport airports with multiple terminals and aprons, to scientifically determine the usage pattern of the multi-terminal area, based on the construction of multi-terminal area operation influence factors set, the adversarial interpretive structure modeling method(AISM) was improved by using the fuzzy theory, The horizontal intercept distribution was indepth analyzed by the fuzzy reachable matrix, and then the confrontation hierarchy model of multi-terminal area operation influence factors was obtained. Finally, the correlation and logic between the factors were analyzed by the topology diagram of the adversarial hierarchy and the fuzzy driver-dependency diagram, and the long-term planning of one of the trunk airports of the Guangdong-Hong Kong-Macao Greater Bay Area was used as an example to verify. The results show that the annual airline passenger traffic and the number of airline peak hour passengers have higher driving force and weaker dependence. The airline space allocation and utilization strategy and the accessibility of the decentralized inter-terminal mass rapid transit(MRT) system have lower driving force and higher dependence. Combining the surface, intermediate, and deep influencing factors revealed by the confrontation hierarchy topology diagram, it is clear that annual airline passenger traffic and peak hour passenger count are the most root and critical design influencing factors of zonal operation. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Technology Economics is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The increasing volume of airport flights inevitably brings about the increase of airport delay level during peak hours, so the scientific prediction of airport delay level is of great significance to ensure the efficiency of airport operation. Firstly an airport queuing network model was established based on aircraft operation characteristics. Then the Lempel-Ziv algorithm was used to calculate the complexity of flight time series at different time scales, the small time scale was determined to portray flight delays. Thus, the queuing network model parameters were determined and verified by example. Finally, the AirTop simulation software was used to simulate the trend of airport delay level with the average delay of the whole day and the average delay of the peak hour as the key indicators. By comparing the simulated data with the calculated results, it is found that the airport queuing network model can better reflect the real airport delays. And the small time scale of 15 min is chosen for the calculation of airport queuing network model parameters, the results are closer to the real airport delay level. [ABSTRACT FROM AUTHOR]

In order to further improve the road performance of asphalt pavement, the multihole hollow silica nanoparticles (MHSN) was proposed to be used as the adsorbent of asphalt smoke and mixed into asphalt mixture to measure the road performance of modified asphalt. Nano-MHSN prepared by hydrothermal method was characterized by scanning electron microscope(SEM), transmission electron microscope ( TEM) and Brunauer-Emmett-Teller(BET), and the rheological properties and VOC emission of modified asphalt were determined. The results show that most of the pores on the surface of MHSN are continuously distributed between 0 and 50 nm. The addition of MHSN reduces the penetration of asphalt, increases the softening point, increases the composite shear modulus of asphalt, and slightly reduces the phase angle of asphalt, which can improve the rutting resistance of asphalt mixture at high temperature. The addition of MHSN can significantly reduce the total emission of asphalt VOC and inhibit the emission of various components in asphalt VOC to varying degrees. It can be seen that the asphalt mixture with nanometer MHSN has excellent road performance and can be used in road construction, with obvious economic and social benefits. [ABSTRACT FROM AUTHOR]

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the adjustment and upgrading of global industrial value chain, how a country can effectively enhance its position and role in the global value chain in its inherent state becomes the key to economic development. As a fundamental industry for the development of energy economy, it is important to improve its industrial foundation capacity and risk management level. The manufacturing production risk was studied from the perspective of multi-value chain synergy. A simulated spatial digital elevation model was established to analyze the multidimensional influencing factors affecting manufacturing production risk. The manufacturing production risk decision objectives and constraints of multi-value chain synergy were set. The manufacturing production risk decision model was developed to propose effective risk management strategies for manufacturing production operations. The research results show that only by ensuring that the production scale is within a reasonable range can the risk of each link of the multi-value chain be reduced collaboratively, so as to effectively control the overall manufacturing production risk level. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Technology Economics is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Composite highway-rail tunnel is different from other composite rail tunnel, and its dynamic response is also different under vehicle and train combined load. In order to study the dynamic response of the composite highway-rail tunnel under the composite traffic load, the excitation force method, cellular automata and vehicle dynamic model were used to simulate the train load, vehicle flow and vehicle load, and the finite element software Plaxis3D was used to analyze the dynamic response of the tunnel under different loads and with or without cushion. The results show that the acceleration response of highway tunnel and railway tunnel is mainly to vehicle load and train load, respectively. The acceleration response of railway tunnel is significantly greater than that of highway tunnel, which is about 20 times of the latter. At different locations of the tunnel, the stress response to the two traffic loads are different. The stress response of the railway tunnel is mainly controlled by the train load. However, when large vehicles pass through the highway tunnel, it will have a great influence on the stress response of the railway tunnel, and even play a leading role. The dynamic response of highway tunnels will be increased by setting cushion between highway and railway tunnels. However, the stiffness difference of the soil below the highway tunnel is reduced by cushion and then the stress value of the soil is reduced. Under the combined effect, the stress state of highway tunnels will be improved after setting cushion. [ABSTRACT FROM AUTHOR]

In order to obtain the practical seismic design method of the metro station structure with large chassis of upper frame buildings, the influence law of upper frame building structure on seismic response of metro station structure was investigated based on series of numerical simulation experiments on dynamic interaction of soil-metro station with the upper frame building system and a simplified method called mode decomposition method-reaction acceleration method was proposed for the seismic design of seismic analysis of underground structure in the integrated structure system which refered to the basic principle of traditional reaction acceleration method as well. Firstly, the feasibility of mode decomposition-reaction acceleration method was verified theoretically, and the mechanical model and implementation steps of the proposed method were introduced in detail. Secondly, taking the integration project of subway station and upper cover high-rise building in a core area of Beijing as the background, the influence factors such as peak acceleration, structural stiffness, soil stiffness, upper cover structure height and seismic wave type were used to analyze computational accuracy of mode decomposition method-reaction acceleration method by comparing with the results of time history method and traditional reaction acceleration method. The results show that the proposed method is a simplified analysis method with simple operation, high accuracy and calculating results biased towards safety, which can be applied to the seismic calculation of similar projects. [ABSTRACT FROM AUTHOR]

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Industry is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The original geological environment of the Loess Plateau is extremely weak. In recent years, the intensity of human engineering activities (such as building cities on flattened mountains, governing valleys, and retain plateau) are beyond geological land ecological carrying capacity. It leads to frequent geo-disasters. Firstly, the high and steep slopes of loess tableland located in the typical ecological restoration area (in Yan'an City, northern Shaanxi) was selected as demonstration area of disaster prevention and control. The new materials of loess curing agent combined with turf transplant technique was plan to adopt to modify and remediate the loess slope. Several physical simulation contrast experiments was carried out under different rainfall intensity conditions (60, 120, 150,180 mm/h). The dynamic evolution process of loess tableland slope erosion was revealed. Then it was refined that the response relation between underground physical and mechanical parameters and surface deformation and rainfall intensity. Based on the perspective of water controlling, the experimental results show that the application of improved loess and new technology can successfully decreased erosion degree of slope runoff. On the other hand, hypotonic materials slow down surface water vertical infiltration then transformed into groundwater and prevent soil and water loss, collapsibility failure and large range loess collapse deformation. [ABSTRACT FROM AUTHOR]

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The behavior of crack initiation, propagation and coalescence in rock is the key mechanics of rock deformation, strength and stability, and it is important to predict and analyze crack growth behavior by numerical method. Phase field（PF） method overcomes the challenge of the traditional fracture mechanics theory and numerical method to explicitly track the crack surface within the framework of strict and accurate theory, and can simulate crack initiation, propagation, branching and multi-cracking. A multi-scale model that can reflect the internal microstructure of rock materials was established at the main area of crack growth. The failure progress of crack initiation, propagation and coalescence within the basalt under three-point bending test was predicted and analyzed by phase field method. The influence of the distribution of mineral inclusions and energy release rate on the crack propagation behavior was investigated and the numerical simulation results were compared and verified with the experimental data. It is shown that the proposed multi-scale PF model considering the complex internal microstructure of basalt rock is able to simulate and predict the progress of the crack behavior. The behavior of crack initiation, propagation and coalescence in rock is the key mechanics of rock deformation, strength and stability, and it is important to predict and analyze crack growth behavior by numerical method. Phase field（PF） method overcomes the challenge of the traditional fracture mechanics theory and numerical method to explicitly track the crack surface within the framework of strict and accurate theory, and can simulate crack initiation, propagation, branching and multi-cracking. A multi-scale model that can reflect the internal microstructure of rock materials was established at the main area of crack growth. The failure progress of crack initiation, propagation and coalescence within the basalt under three-point bending test was predicted and analyzed by phase field method. The influence of the distribution of mineral inclusions and energy release rate on the crack propagation behavior was investigated and the numerical simulation results were compared and verified with the experimental data. It is shown that the proposed multi-scale PF model considering the complex internal microstructure of basalt rock is able to simulate and predict the progress of the crack behavior. [ABSTRACT FROM AUTHOR]

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To address the problems of low accuracy in matching feature points between images, cracks in the image stitching and long image stitching times in the image stitching process, an image stitching algorithm based on a combination of oriented fast and rotated brief(ORB) and random sample consensus (RANSAC) was proposed. Firstly, the wavelet transform was used to obtain sub-image components representing the approximate, horizontal, vertical and diagonal characteristics of the image, and the sub-image components of the approximate, horizontal and vertical characteristics of the image were selected and superimposed to obtain the image for the next step of feature extraction. Finally, the image was fused using the Laplace Pyramid algorithm. The experimental results show that the average time taken to extract features from the selected images using the combined ORB and RANSAC based image stitching algorithm is about 84. 7% of the traditional scale invariant feature transform(SIFT) algorithm, 36. 4% of the speed-up robust features( SURF) algorithm and 64. 9% of the ORB algorithm, the image feature matching accuracy is improved, the image feature matching time is shortened and there are no obvious cracks at the image stitching. It is concluded that the image stitching algorithm based on the combination of ORB and RANSAC is a high-quality image stitching algorithm. [ABSTRACT FROM AUTHOR]