Design and practice of virtual simulation experiment for broadband wireless communication

Power system is an important knowledge point in the course of Electrotechnics. In order to solve the difficulties in the experiment of power system, the virtual simulation technology was introduced into the experimental teaching. a virtual simulation experiment system named Generation, transmission and application of electric power based on offshore wind power generation was constructed. The design idea, scheme, content, method and platform of the experimental teaching are elaborated in detail. Through this experiment, student can not only learn the generation-transformation-transmission-distribution-application whole process of electricity, but also associate the knowledge points learned in the theoretical course with the actual application scenarios. The student can carry out experiment on the virtual experimental platform just like in the real scene. This method can effectively improve the effectiveness of experimental teaching and cultivate the practical ability of student.

At present, in the innovative practice of computer courses and teaching reform in colleges and universities, we have adopted the innovative teaching mode of virtual simulation experiments in programming languages, combined the methods of online and offline, and the combination of virtual and real, to improve the experimental teaching mode and use experiments. The teaching virtual simulation program has set a virtual simulation experiment platform for order language. This can not only achieve the goal of improving experimental teaching, but also make up for the problems of traditional experimental teaching students' lack of initiative and poor theoretical learning effect. This article expounds on the construction of virtual simulation experiment platform and the design innovation of the teaching mode. It reflects on the way of using virtual simulation experiment in the teaching of computer science in colleges and universities, hoping to have reference value for improving the teaching level of virtual experiment teaching.

The pharmaceutical analysis course is an important bridge to train students' competence in evaluating drug quality. The members of the research group combined the position requirements of quality control (QC) in pharmaceutical factory with many years of teaching experience, and wrote the pharmaceutical analysis experiment handout and PBL teaching case in line with the development of The Times. This paper analyzes the relationship between the key words in PBL case and the knowledge of the pharmaceutical analysis course, expounds the implementation process of PBL teaching and its significance, and briefly introduces the rain classroom and virtual simulation experiment platform used in teaching. Over the years, the teaching mode of combining rain classroom, PBL and virtual simulation experiment has gradually become the feature of the course of pharmaceutical analysis in our school. This paper discusses the three-dimensional teaching reform of rain classroom, PBL and virtual simulation experiment, and analyzes the teaching effect of the teaching reform with a questionnaire survey. The change of students' learning ability is analyzed from the aspects of student achievement, student self-evaluation and mutual evaluation and classroom evaluation, and it is found that the teaching mode can improve students' self-learning ability, critical thinking innovation ability, and cooperation and communication ability to a certain extent.

Traffic capacity planning is a challenging task in multiple input multiple output (MIMO) & orthogonal frequency division (OFDM) based long term evolution (LTE) cellular networks, resulted from emerging diverse multimedia traffic requirement, together with highly open & flexible air interface design in LTE. In this paper, a new methodology for dynamic real-time capacity planning is proposed for LTE radio network dimensioning, based on unified traffic process mechanism, fresh simulation methodology for air interface, and smart self-evaluation and optimization. By corresponding software design and implementation, it provides powerful tool for LTE network planners to get efficient, accurate and professional capacity planning outcome without much manual effort.

The modern telecommunication has come into the Long-Term Evolution (LTE) era. The whole transmission network gradually has evolved to the IP network. The overall network organization is likewise becoming more and more similar to the metropolitan data network. A mobile Packet Transport Network (PTN) transmission network construction is investigated. The specific bearing requirements of time division long-term evolution (TD-LTE) are analyzed. The topology structures of L3 and L2/L3 and the equipment applications in different network levels of the PTN network are discussed. The existing problems concerning the circuit scheduling, disaster tolerance requirement, security connection and business pressure are analyzed in detail. Their corresponding optimization strategies are presented. Finally, the network level having a clear, robust and complete coverage is reached. It proves that the optimized network can meet the third level of the disaster tolerance international standard SHARE 78.

BackgroundVirtual simulation experiment is a vital component of higher education digitalization, emerging from the deep integration of specialty disciplines and information technology. Chinese universities have invested heavily in the construction of virtual simulation experiment projects, and the number of projects is considerably large. However, the popularity and effectiveness of these projects are not satisfactory. As an important index to measure the teaching quality, analyzing the influencing factors and mediating effects of learning satisfaction of virtual simulation experiment is an effective entry point to improve the quality and efficiency of virtual simulation experiment teaching and improve the learning effect.MethodsThis study used quantitative research methods. The research sample includes 538 students from various levels of higher education institutions such as Nanjing University, Nantong University, Nanjing Medical University, and Jiangsu University, covering 11 majors. They started to study the virtual simulation experiment course for one academic year in September 2023 and conducted a questionnaire survey at the end of the course. The questionnaire survey involved four aspects, mainly from the student dimension, course dimension, the technical dimension, and the embodied dimension to evaluate the learning satisfaction of the virtual simulation experiment course. The data were analyzed using SPSS and AMOS.ResultsAccording to the results of the structural equation modeling (SEM), all of the student dimension (learning motivation {β = 0.658,p < 0.001} and task value {β = 0.339,p < 0.001}), course dimension (course content {β = 0.275,p < 0.001}, course flexibility {β = 0.052,p < 0.002}, and course quality {β = 0.635,p < 0.001}), technical dimension (interface design {β = 0.445,p < 0.001}, interaction design {β = 0.151,p < 0.001}, technical adaptability {β = 0.225,p < 0.001}, and technical reliability y{β = 0.140,p < 0.001}), and embodied dimension (social presence {β = 0.270,p < 0.001} and spatial presence {β = 0.689,p < 0.001}) have positive effects on improving the learning satisfaction of virtual simulation experiments. Meanwhile, the technical dimension exhibited a mediating effect in the influence of embodied dimension on learning satisfaction.ConclusionsTo enhance the learning effectiveness of virtual simulation experiments, we can put forward the strategies from four dimensions including students, course, technical, and embodied to specifically address learning satisfaction. This approach would provide directional guidance for the development of medical virtual simulation experiments.

This article explains the significance of "virtual-actual combination" teaching mode of virtual simulation experiment, construction content of "virtual-actual combination" teaching platform on the basis of " virtual simulation experiment teaching center of machinery foundation and textile equipment design" construction work in school of mechanical engineering in Tianjin Polytechnic University, taking dynamic performance analysis simulation module of high speed and mixed-phase device as example, the implementation effect of "virtual-actual combination" is expounded, and the "virtual-actual combination" teaching platform construction of machinery foundation and textile equipment virtual simulation experiment center are prospected.

Through the analysis of the current research situation at home and abroad, this article finds that there is a lack of evaluation standards and methods in the virtual simulation experiment of e-commerce logistics smart warehousing. Therefore, it seriously affects the standardization and rationality of the experiment. To solve the problems in the evaluation of the current virtual simulation experiment, this article proposes a virtual simulation experiment evaluation model of e-commerce logistics smart warehousing based on multidimensional weighting. This article firstly sorts out the basic process of e-commerce logistics smart warehousing experiment activities and establishes the evaluation object. Then, based on the duality degree of the output results of the experimental steps, it proposes a method that conforms to the corresponding operation steps. Thus, a three-dimensional evaluation model of the completion degree of the operation steps, the reasonable degree of the operation steps, and the completion time of the operation steps are constructed. An automatic scoring evaluation model is proposed based on the combination of three-dimensional weighted evaluation of experimental steps. Finally, the feasibility and convenience of the evaluation model are verified through the experiment analysis.

For the practical teaching of computer specialized courses in colleges and universities, this study proposes the construction method of virtual simulation experiment platform based on OpenStack, Docker, Seafile and Raspberry Pi, and on this basis, deeply discuss the design and implementation details of the course experiment. The construction and application of virtual simulation experiment platform change the traditional teaching method fundamentally, reduce the cost of laboratory construction and management, which have important reference value to realize the remote experiment teaching. The virtual simulation experiment platform is composed of four parts: virtual machine, application container, cloud storage and client, which can meet the daily teaching needs, cultivate students’ interest in learning, and improve their innovation ability.

According to the characteristics of Packet Transport Network (PTN) mesh network topology, an improved dynamic elimination algorithm for topological design of PTN mesh networks, Dynamic Elimination of Stable Route (SR-DE) algorithm, was proposed to improve computational efficiency of PTN mesh network topology design. The algorithm first analyzed the PTN network resource and business information, and then the algorithm dynamically changed the number of eliminated branches in each loop of eliminating redundant links, routed the business through stable route, so it could reduce the number of network weights change and avoid the repeat route of business and increase the efficiency of computation. The simulation results show it can improve the computational efficiency of PTN mesh topology design.

Virtual simulation experiments in intelligent manufacturing serve as an effective extension and complement to theoretical courses and physical experiments in manufacturing disciplines. Relying on the Internet, students engage in experimental operations such as process planning, production control, and logistics management on virtual intelligent manufacturing production lines that integrate CNC machine tools and robotic arms. Conducting reasonable evaluations on the correctness of students' experimental designs and operations, as well as their mastery of knowledge, is an effective way to improve the quality of teaching. Considering the characteristics of virtual simulation experiments in intelligent manufacturing, this study proposes a structured evaluation method, including classification and evaluation based on knowledge points, evaluation of engineering operation skills, and overall evaluation of process rationality and safety. By using automated evaluation by virtual simulation software, in addition to manual evaluation by instructors and self-evaluation by students, a standardized and practical experimental evaluation method was established. After implementation across multiple courses and semesters, the evaluation results were found to be reliable and accurate, demonstrating the rationality and universality of the proposed method.

In order to solve the problem that students cannot fully grasp the analysis and design methods of the engineering physical control system without the automatic control comprehensive experimental device in the laboratory, the virtual simulation experiment teaching design of the linear inverted pendulum control system is carried out by taking the linear first-stage inverted pendulum and the linear second-stage inverted pendulum as examples. Three-dimensional animation technology, visualization technology, computer programming technology and database technology are used to provide students with virtual simulation experiment training on the structure and disassembly of linear inverted pendulum system, as well as photoelectric encoder principle, modeling of linear inverted pendulum system, single loop PID control, double closed-loop PID control, state feedback control and LQR control. Adopting a student-centered teaching approach, and through the self-interactive virtual simulation experiment, the students master the classical nonlinear system modeling, analysis and controller design methods, and the teaching effect of “With the virtual to fill the real, deep interaction, integration of theory and practice ” is achieved.

ABSTRACTTechnological advancements have spurred the development of unmanned ground vehicles (UGVs) and their innovative military applications and strategies. Such applications include expendable UGVs. However, public research concerning expendable military UGVs remains sparse. Particularly, the unclassified literature does not contain studies regarding their capabilities and effectiveness in combat. This study introduces a new low‐cost expendable UGV called Laykka. Moreover, the study presents a virtual simulation experiment to evaluate Laykkas' operational capabilities and their impact on advancing mechanized infantry units. The experiment involved armored reserve officer students assuming the roles of infantry troops forming an attacking opposing force while staff officers controlled simulated infantry troops operating the UGVs. A total of 16 battle simulations were fought. The simulated UGVs operated by a single soldier were able to stall the advancement of the mechanized infantry company's primary combat units three times out of four and a smaller force 11 out of 12 times. The best stalling effect was observed using a mix of UGVs with different module types. These modules allowed reconnaissance, loitering mine, and anti‐tank operations. The simulation experiment revealed that the UGV was an effective defensive tool due to its self‐destructive capability, causing marked battle damage, disruption, and confusion to the opposing forces.

With the development of virtual reality technology, different kinds of terminal device were employed in virtual simulation experiment teaching, and many new release forms of virtual experiment came out. The feature of human-computer interaction in different kinds of terminal device was analyzed in this paper, and the demands for human-computer interaction feature of different learning aims were specified. Combined the impact of different virtual experiment systems release forms on the virtual experimental environment, a suggested solution was proposed for virtual experiment designer choosing a proper releasing terminal device. At last, 527 virtual experiments were selected from candidates for national virtual simulation experiment teaching projects in 2019, and the suggested solution was employed to assess these experiments. As a result, 12% of experiments were released in improper terminal, this indicated that there are existing misunderstandings when the virtual experiment system designer choosing terminal device.

In the current environment of burgeoning demand for mobile broadband, Long Term Evolution (LTE) is the most preferred wireless technology for the mobile operators. Considering the legacy multi-technology networks, operators need to strategically work upon maximizing their revenue while minimizing their cost and satisfying the subscriber’s requirements as well. Operators have a choice between 2 network strategies- LTE overlay and single radio access network (SRAN). A survey carried out proved SRAN to be the optimum LTE deployment strategy considering the total cost of ownership (TCO). This paper discusses the effect on the system performance due to the up gradation of network from second generation (2G) to third generation (3G) to long term evolution (LTE) systems using Nokia Siemens Network Flexi multi-radio base stations. Measurements of RSRP (Reference Signal Received Power), SINR (Signal to Interference plus Noise Ratio) and throughput were carried out by a drive test within 2Km of the deployed site area which indicated that all the 3 parameters were affected as the user equipment moved away from the site area and towards the cell edges. This problem can be addressed by deployment of low power relay nodes, one of the promising techniques, for increasing the coverage of LTE advanced networks (the future of LTE systems).