The large array multi-group scanning ultrasonic phased array system can provide better scanning flexibility, image contrast, increase the diversity of focal law and realize distributed scanning. In order to improve resource utilization, ensure realtime performance and realize distributed scanning under limited resources, it is necessary to study system resource reuse and data processing cooperative scheduling, reduce hardware consumption and avoid signal processing overlapping conflicts, and improve instrument performance. Therefore, the scheduling theory, methods and key technologies of multi-group delay and focus, multi-group homogeneous flowshop signal processing, heterogeneous hierarchical multi-DAG (directed acyclic graph) signal processing in multigroup scanning system ultrasonic phased array with large array are mainly studied. The method also applied to the development of multi-group scanning instrument of large-element ultrasonic phased array.

】 By analyzing the current situation of classroom attendance in higher vocational colleges, the application of location at- tendance technology in the evaluation of teaching process is researched and explored. Aiming to the characteristics of centralized classroom teaching, mobile whole-class training and sketching, as well as decentralized off-campus practice, we adopt location atten- dance technology based on Euclidean Distance, Mahalanobis Distance and personal history data to check students’attendance and then form teaching process evaluation data. It conforms to the development trend of teaching process evaluation and has certain ap- plication and popularization value.

】 As an important part of quality education, aesthetic education and moral education, intellectual education, physical ed- ucation are complementary. The penetration of the aesthetic education in the basic teaching of the higher vocational computer con- tributes to the improvement of the comprehensive quality of the students. In this paper, the present situation of aesthetic education in higher vocational education and the carrier of aesthetic education are summarized. At the same time, how to infiltrate the aesthetic education in the basic teaching of computer is also discussed.

In order to implement the National Implementation Plan of Vocational Education Reform, combining with the excel- lent courses of provincial quality project — — “Electronic Technology Foundation and Process Assembly Training”, this paper active- ly explores the construction of practical training courses in vocational colleges from the following aspects: reasonable selection of teaching content, diversified teaching methods, introduction of micro-classroom, relying on enterprise production platform, and close contact with jobs.

With the rapid development of the Internet and smart products, mobile learning based on WeChat, APP, QQ is becom-ing more and more popular. Mobile learning is deeply integrated with teaching in the field of continuing education, and it can effec-tively solve the contradictions in engineering and learning of continuing education students. This paper introduces the development of mobile learning platform in the field of continuing education, which provides convenience for the study of students in continuingeducation, and puts forward the direction of improvement in the future according to the shortcomings of the development of the plat-form.

Aiming at the traditional teaching mode of embedded system course, a mixed online and offline teaching method isproposed. The online and offline teaching mode is designed from the aspects of teaching content, teaching methods and teaching evaluation, aiming at cultivating students' practical and innovative abilities. This paper discusses on the application of online and of-fline interactive teaching method in embedded system course teaching from the aspects of online network resource design and of-fline classroom theory teaching, and analyzes the teaching effect of hybrid teaching mode.

This paper designs a simulation training platform for naval power station based on PLC, which combines PLC control technology, PPU module technology and frequency conversion control technology to realize a multi-functional training platform for naval power station. The training platform can be used for teaching and scientific research in undergraduate or higher vocational colleges, and can be used for students to carry out comprehensive training and practical examination simulator for naval power station. At the same time, the naval power station fully meets the requirements. The functional requirements of actual ships have certain practicability.

Aiming at the massive information brought by big data, the traditional data mining method is no longer applicable. In recent years, many scholars have proposed new data mining methods, or improved the traditional methods. But it is still far from adapting to this vast amount of information. After summarizing the previous methods, an improved K-Means algorithm based on Canopy is proposed in this paper. Compared with the traditional K-Means, the improved method proposed in this paper will first de- termine the initial center by density, and then run the reduced data on the Hadoop distributed cluster. The experimental results show that this method can reduce the computational complexity and improve the computational efficiency under the condition of ensuring the accuracy.

For the problem that thermal printer can’t print gray scale image in the market, this paper proposes a gray-scale processing algorithm based on binary image. By region segmentation, region gray-scale processing and region binary processing of the original RGB bitmap, this algorithm can make the binary image show a certain grayscale effect visually. This algorithm runs on STM32 platform, and is verified by TFTLCD display and tested by actual thermal printer. The result shows that the algorithm is correct and available.

A hotel reservation management system with complete function is developed by using ASP.NET and SQL Server 2016. The system adopts B / S mode. In the front desk of the system, combined with AJAX and GDI technology, the registration function of members is realized; the conflict judgment algorithm is compiled to realize the residual information prompt function of room reservation; in the background of the system, the page layout is completed by using IFrame framework; the online text editor FreeTextBox is used to realize the release and maintenance of hotel information, which makes the display form of information more diversified. The system can assign permissions according to different roles of users, which ensures the security of system data to a certain extent. In addition, other functions such as room information and personnel management have also been well realized in the system.

Navigation drop-down menu is a common effect in browsing web pages, and it is an important content in the frontend development of WEB. Using DIV + CSS, we can make navigation drop-down menu with rich effect. In this paper, DIV is used for navigation layout. The drop-down menu of horizontal navigation consists of UL unordered list and CSS. In the process of realizing the effect of navigation drop-down submenu, the method of setting the CSS style of each page element is given, and the specific application method of each CSS style attribute is analyzed.

With the arrival of the information age, the application of network is more and more extensive, and the application of computer in various fields is more and more popular. While expanding the enrollment scale of secondary vocational schools, in order to alleviate the tedious daily work of classes and improve the work efficiency of teachers, a class management OA system is devel- oped based on SQL SERVER 2008 database, using ASP.NET technology, according to the characteristics of our school and the actu- al situation of class management. It realizes class attendance management, class announcement, class meeting records, thematic class meeting display, student information management and other class daily work management. And the desired results are achieved through tests.

Network security has attracted more and more people's attention, and data encryption technology provides more reliable guarantee for network security. This paper mainly uses the Visual Studio programming platform for the software programming of encrypt DES data, and realizes the application of DES data encryption algorithm in network communication, which has achieved good results in practical applications.

A complete set of information system is proposed for the management and operation of long-distance pipeline, and it is realized through the open source GIS software. The system includes the developing environment selection, data processing and storage, data distribution and visualization, realizing the functions of basic operation of the map, geometric measurement, map positioning, hidden danger viewing and statistics, and so on. The test shows that the system provides a realistic management scheme for the research of long-distance pipeline, and has a certain reference value.

With the development of the social and economic environment, water conservancy work has gradually transformed towards informationization. Aiming at the limitations of the infrastructure construction, the lack of command center, the scattered information of the emergency information in the current water conservancy application system, the weak analysis and decision-making ability, and the lack of a complete emergency command system, a complete intelligent dispatching emergency command platform system is designed. And the software design, system design, system debugging and operation are described respectively. The system integrates emergency command and dispatch into a management system by utilizing big data, cloud computing, collaborative work and real-time supervision means. Through sharing command platform and information platform, the system can realize unified command and joint action, and improve the level of water resources informatization.

Machine vision is used in industrial robot applications for industrial inspection, flaw detection, precision measurement and control, automatic production lines, medicine and various hazardous applications. Based on the open source robot operating sys- tem ROS, this paper uses Kinect binocular vision sensor to obtain 3D stereo vision data, and combines with OpenCV, OpenNI and other open source machine vision libraries to design a low-cost machine vision system using the auxiliary machine vision tools pro- vided by ROS. The experimental test is carried on the prototype.

Based on the data of China Knowledge Resource Integrated Database and WeChat Public Platform, this paper makes a statistical analysis of the network information dissemination from October 2017 to June 2019 in Sci-tech and Finance magazine. This paper discusses the characteristics of network information dissemination of periodicals from two aspects: the ability of network information dissemination and the influence of content, and probes into the practical application of the Journal online. The results show that Sci-tech and Finance magazine has a certain ability of network information dissemination, and its content has a certain so- cial influence. The journal is rich in content and full of vitality, but it still needs to strengthen the construction of network informa- tion dissemination platform. This paper can provide some reference and thinking for the development of online information dissemi- nation of comprehensive Sci-tech periodicals.

teaching method| outcome-based teaching|visualization teaching

Under the background of information age, the demand of enterprises and individuals for software and related equip- ment is increasing. The software and its affiliated projects have a lot of complexity and uncertainty in the development process. Therefore, risk management for software projects is crucial. This paper firstly expounds the importance of software project risk man- agement, then analyzes the software project risk identification, evaluation and specific countermeasures.