Adaptive Aging Safety of Guidance Marks in Rail Transit Connection Systems Based on Eye Movement Data

The aim of this study was to meet the visual cognition needs of the elderly population for the guidance marks and safety guidance marks of the rail transit connection system. Based on the visual characteristics of the elderly population, this paper firstly determined the visual field and sight range of the marks of the elderly population from three aspects—visual angle, visual distance, and height of the elderly population—and constructed the visual recognition space of the elderly population. Then, from the perspective of the setting position, the setting height, and the deflection angle, an adaptive aging safety design method for the guidance marks in the rail transit connection system is proposed. Then, based on the eye movement data of fixation duration, initial fixation duration, and the number of visits, a visual behavior index model is constructed to iteratively optimize the adaptive aging safety design of guidance marks in a rail transit connection system. A radar map is used to calculate the comprehensive index of visual behavior to determine the optimal scheme. Finally, taking the traffic connection system of Shanghai Songjiang University Town Station as an example, the eye movement data of 37 participants were collected, according to the principle that each connection path should only be taken once per person; the above method was used to design 7 connection path guidance marks for an adaptive aging safety design. The results showed that the comprehensive index of visual behavior of different paths had different degrees of improvement of up to 14.00%, which verified the effectiveness of the design method. The research results have certain theoretical significance and application value for the adaptive aging safety design and retrofit of guidance marks of rail transit connection systems.

Search Engine Optimization Method of Online Course Management Platform

This study proposes a method of keyword selection in search engine optimization to improve the accuracy of search engine and website rankings. To promote the development of scientific and technological innovation, this paper selects the innovation and entrepreneurship curriculum platform as the experimental object. By comparing different search engine optimization strategies, the keyword search volume data is analyzed based on “comprehensive index evaluation method”, which analyzes and calculates the change of keyword search comparison and the number of related keywords. Therefore, this paper will use the comprehensive index evaluation method for keyword selection, and establish a set of practical keyword selection method combined with the actual situation of innovation and enterprise curriculum platform. The results show that this program can improve search accuracy and website ranking.

The Analysis and Comparison of the Comprehensive Index of the Development of China Urban Exhibition Industry

With the development of modern economy, exhibition industry has become an important platform for the construction of modern market system and open economic system. At present, there are many indicators to measure the competitiveness of urban exhibition industry in China. The annual index of competitiveness of Chinese city exhibition industry initiated by China convention and exhibition economic association has become the most authoritative report of competitiveness index of city exhibition industry. The exhibition industry is also one of the important evaluation criteria. This paper mainly uses the above two methods to calculate the exhibition competitiveness index of Chinese cities, and introduces the correlation coefficient to compare the stability of the ranking of the exhibition competitiveness index by the two methods. The study found that the correlation coefficient between the cities at the top and bottom of the ranking was large, that is, the ranking was relatively stable and barely changed. However, the ranking correlation coefficient of cities in the middle is smaller and the change is significant. However, the correlation coefficients of the cities ranked 21-40 are less than those of the top 20 cities, which also indicates that the abrupt change in the ranking of individual cities will affect the overall stability. Because of this, it shows that the evaluation indexes under different weights have a certain influence on the calculation of the comprehensive index of the city’s exhibition competitiveness, and the AHP method can better reflect the advantages and disadvantages of the city’s exhibition industry development.

Influence of Fuel Level on Properties, Productivity, and Mineralogy of Russian Vanadiferous Titanomagnetite Sinter

The influence of fuel level on Russian vanadiferous titanomagnetite sinter properties, productivity, and mineralogy are researched by sintering pot testing, metallographic microscopy, scanning electron microscopy analysis, and energy dispersive spectrometer (SEM-EDS) analysis. A comprehensive index is evaluated in conjunction with the same indexes and significance coefficient as that in the Panzhihua Iron and Steel Group. Results show that with the increasing fuel level from 3.5% to 6.0%, flame front speed, yield, tumbling test index (TI), and productivity, all first increase and then decrease. The low temperature reduction degradation index (RDI+3.15) and softening zone (ΔT) gradually increase while the RI and starting temperature of softening (T10), and ending temperature of softening (T40) decrease with increasing fuel levels from 3.5% to 6.0%. With the increase of fuel level from 3.5% to 6.0%, the content of FeO, SiO2, and MgO increase, while TiO2 shows a decrease. For the same increase in fuel level, the number of pores and calcium ferrite and hematite decrease but the silicate increases. In addition, in the fuel level range of 3.5% to 5.5%, magnetite correspondingly increases but then shows a drop after 5.5%. Moreover, when the fuel level increases to greater than 5.0%, FeOx and fayalite quickly increase and a small amount of metallic iron appears under the fuel level of 6.0%. Overall, the optimal fuel level under current production conditions and indicator selection is 4.0%.

Selection of the Optimal Number of Topics for LDA Topic Model—Taking Patent Policy Analysis as an Example

This study constructs a comprehensive index to effectively judge the optimal number of topics in the LDA topic model. Based on the requirements for selecting the number of topics, a comprehensive judgment index of perplexity, isolation, stability, and coincidence is constructed to select the number of topics. This method provides four advantages to selecting the optimal number of topics: (1) good predictive ability, (2) high isolation between topics, (3) no duplicate topics, and (4) repeatability. First, we use three general datasets to compare our proposed method with existing methods, and the results show that the optimal topic number selection method has better selection results. Then, we collected the patent policies of various provinces and cities in China (excluding Hong Kong, Macao, and Taiwan) as datasets. By using the optimal topic number selection method proposed in this study, we can classify patent policies well.

Evaluation of urban water security based on DPSIR model

Assessment of urban water security is an important scientific basis for the sustainable utilization of urban water resources. This study established an evaluation model for urban water security based on DPSIR model, entropy method and comprehensive index method. The model was applied to Gong Qingcheng City (GQCC) in Jiangxi Province, China. An indicator system is developed based on four aspects including social development, water resources status, water pollution and water resources management, as well as summing up predecessors’ experience. This study analysed per capita domestic water consumption; ratio of ecological water compensation; percentage of water conservancy and public infrastructure investment; and water consumption per ten thousand yuan of industrial output value; where ratio of urban sewage treatment are the main effects on urban water security. The results of single index evaluation show that the change of stress subsystem was most dramatic from 2013 to 2017, while others were relatively stable. This indicates that positive interventions were urgently needed to relieve pressure of the stress subsystem. The results of comprehensive index evaluation show that water security at GQCC was in a critical state. In this paper, the causal relationship between social development and water security was clarified while the main factors and other factors affecting urban water security was identified. Finally, a reference for the formulation of urban development planning based on water resources demand was provided.

Research on the Coordination of Green Finance and Green Economy with the Goal of Sustainable Development

In order to give full play to the integration between green finance and green economy, the selection of appropriate evaluation indicators is worth further exploration. Therefore, this paper is conducted with exploration on the combination of comprehensive index system and comprehensive method, which give evaluations on the coupling coordination degree between green finance and green economy by combining the coupling coordination degree model with ESG, so as to achieve the goal of sustainable development.

Denim-fabric-polishing robot size optimization based on global spatial dexterity

This paper presents a novel method to make denim-fabric-polishing robots perform their primary task flexibly and efficiently within a limited workspace. Link lengths are optimized based on an adaptive fireworks algorithm to improve the comprehensive dexterity index. A forward kinematics analysis of the denim-fabric-polishing robot is conducted via the D–H method; the workspace is analyzed according to the needs at hand to determine the range of motion of each joint. To solve the movement condition number of the Jacobian matrix, the concept of low-condition-number probability is established, and a comprehensive dexterity indicator is constructed. The influence of the robot's size on the condition number and comprehensive dexterity index is determined. Finally, the adaptive fireworks algorithm is used to establish the objective optimization function by integrating the dexterity index and other performance indicators. The optimization results show that when the comprehensive dexterity index is taken as the optimization objective, the dexterity comprehensive index and other performance indices of the robot are the lowest; that is, the robot is more flexible. Compared with the traditional genetic algorithm and particle swarm algorithm, the adaptive fireworks algorithm proposed in this paper has better solving speed and solving precision. The optimized workspace of the robot meets the requirements of the polishing task. The design also yields a sufficiently flexible, efficient, and effective robot.

A Great Variety of New and Fine Designs: Advertisements for Painted Backgrounds, 1856--1903

The painted background, as a piece of photographic equipment, has rarely bee studied apart form its decorative function in portraits. This thesis addresses the history, construction, and use of the painted background within studio portrait photography during the latter half of the nineteenth century as revealed from examining advertisements for painted backgrounds. 1,096 advertisements for painted backgrounds were reviewed in nine periodicals published in the United States of America from 1856 to 1903, all taken from the Richard and Ronay Menschel Library at George Eastman House. This material has been compiled into a comprehensive index revealing an increase in the use of painted background within portrait photography during this time period. The analysis of this research also provides information about the history of painted backgrounds, companies advertising backgrounds, sizes, styles, and costs of backgrounds, and ways companies shipped their backgrounds throughout this era.