Electronics Science Technology and Application (E-Journal)
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User-Centered Intelligent Interface of Vending Machines Modeling
Get PDFConvenience and speed of service makes vending machines popular world-wide.However, the development and use of vending machines in China have not kept pace with global markets. In this paper, in order to determine the key design factors, interface elements and parameters which affect the convenience of user-machine interaction, the author analyzes the interaction problems in current vending machine design and finds out that unreasonable design results from machine-centered logic design. Then, with user-centered design principles, a new user-centered intelligent interaction model of vending machines is developed.The result of the test shows that the user-centered interface system can effectively reduce the operational time and decrease the mistake type and mistake rate. The process followed in the present study can also serve as a general framework for the analysis and development of UCD interfaces for other self-service systems
Improved SVD + + Recommendation Algorithm Based on Fusion Time Factor
Get PDFCollaborative filtering algorithm is widely used in recommendation system. Aiming at the problems of data sparsity and low recommendation accuracy in traditional collaborative filtering algorithm, an improved recommendation algorithm is proposed PT _ SVD++. Firstly, the attribute information of users and the implicit feedback information of items are introduced to improve the SVD++ algorithm, which solves the insufficient utilization of information and alleviates the problem of sparse data；Secondly the time effect model is established to further improve the accuracy of the prediction results. The experimental results on MovieLens dataset show that compared with other algorithms, the average absolute error and root mean square error of this algorithm are lower, and its recommendation accuracy is higher
Several Inequalities of Gronwall and Their Proofs
Get PDFIt is well known that integral inequalities play a very important role in studying the properties of solutions to ordinary differential equations and integral equations. In 1919, Gronwall established a class of basic integral inequalities when he studied the dependence of differential equations on parameters, which is called Gronwall's inequalities. Gronwall's inequality play a very important role in ordinary differential equations, and it is also an important tool to study the properties of differential equations and integral equation solutions. There are several proofs of Gronwall's inequality, in particular, Agarwal, Deng and Zhang studied the Gronwall-Bellman inequality with multiple nonlinear terms, which made the adaptability of the Gronwall-Bellman inequality widely. Gronwall's inequality has various generalization forms and different proving methods, which is also a good tool for solving many mathematical problems. Different kinds of Gronwall's inequalities and their proofs are discussed in this paper. By researching the induction of Gronwall's inequality forms and their proofs, this paper aims to solve the problems of inequality as much as possible
Design of Two-Stage Operational Amplifier Based on IC Design
Get PDFModern integrated circuit technology includes analog integrated circuit design and digital integrated circuit design. Analog circuit refers to the circuit used to transmit, transform, process, amplify, measure and display analog signals. Analog signals are electrical signals that change continuously. Analog circuit is the basis of electronic circuit. It mainly includes amplification circuit, signal operation and processing circuit, oscillation circuit, modulation and demodulation circuit and power supply. Compared with single-stage amplifier, multi-stage operational amplifier has higher magnification
Discussion on Fermi Level of Intrinsic Semiconductor and Pn Junction of Non-Intrinsic Semiconductor
No full textSubstances are usually classified according to their electrical conductivity as conductors, insulators, and semiconductors. The specific positions of Fermi energy levels of intrinsic semiconductors and two kinds of extrinsic semiconductors are analyzed. By using carrier concentration, the Boltzmann constant, effective density of states and other physical quantities as well as the related formula, it is concluded that the Fermi energy levels of intrinsic semiconductors lies in the middle of the forbidden band, The Fermi level of n-type semiconductor is higher than the intrinsic Fermi level, while p-type semiconductor is lower than the intrinsic Fermi level. Based on the knowledge of forward bias pn junction and reverse bias pn junction, the basic framework of semiconductor theme is summarized. At the same time, I pay attention to the latest research results of semiconductor, and the future research direction of the semiconductor field has been grasped roughly
Hybrid Teaching Reform and Practice of Circuit Analysis Based on the Internet of Things
No full textCircuit analysis technology belongs to one of the more important basic courses of mechanical and electrical professional teaching, want to improve the education effect, you need to use mixed teaching methods, show the Internet of things + advantages, innovative education activities, do a good job of craftsman spirit training, help students master the basic knowledge of circuit analysis, strengthen professional quality, meet the requirements of professional positions.Based on this paper briefly expounds the basic hybrid teaching reform of circuit analysis under the Internet of Things + for reference only
Design of Computer-Assisted Models for Preventive Medicine Perspective
Get PDFThe simulation exercise of building accidents is conducive to improving the human survival rate after urban building accidents. This is the content of preventive medicine. The remote sensing technology of city map can monitor the building structure and ecological conditions of specific cities, which can be used to build a rapid response model for emergency medicine departments. Therefore, the economic construction can be enhanced to improve the survival rate of the people affected by the disaster, which is beneficial to urban construction. The research team analyzes and reports on the specific model development of computer technology, the computer intelligent simulation of the program setting for specific populations, and the rapid response of emergency medicine as the application object for the relevant workflow analysis, and enhance the perfection of preventive medicine system from the perspective of intelligent economic development
Brief Introduction of the Application of Calculus Concepts to Geometry
Get PDFCalculus has a long development history and its ideas can be traced back to the ancient Greek period. After the second crisis in mathematics, calculus thought keeps evolving and eventually formed the thought of calculus today. The idea of calculus is of great significance to mathematics and has a wide range of applications in geometric figures, such as calculating the quality of space geometry above geometry area.This paper briefly describes the development history of calculus, and analyzes the application of calculus ideas in geometry
Junction Temperature Consistency Analysis of MMC Submodule
Get PDFAlthough modular multilevel converter（MMC）is currently widely used in the field of DC power transmission due to its excellent topology performance, the natural DC bias characteristics inevitably cause thermal imbalance of internal devices. Too high temperature at the junction of power devices is one of the major causes of damage. Therefore, it is necessary to further investigate the factors that affect the device junction temperature. This paper calculated the power loss and junction temperature by combined the thermal impedance model and compared junction temperature under two typical modulation strategies
Effect of Different Minority Carrier Lifetime of Multicrystalline Wafer on Solar Cell Performance
Get PDFIn this article, a study of the effect of different minority carrier lifetime (τ) of wafers on solar cell performance in a conventional industrial production line has been carried out. The results clearly showed that the ultimate efficiency of the solar cells made by wafers of 1μs <τ<1.2μs and 1.2μs <τ<1.5μs is much higher than that of solar cells made by wafers of τ<1μs. The gap of both is about 0.38%–0.53%. Differently, there is no significant difference between wafers of 1μs<τ<1.2μs and 1.2μs <τ<1.5μs. The results obtained are useful when the solar cell companies establish original wafers test standard in industry