Computer simulation is an effective means for the research of robot navigation algorithms. In order to implement real-time, three-dimensional, and visual navigation algorithm simulation, a method of algorithm simulation based on secondary development of Unity3D is proposed. With this method, a virtual robot prototype can be created quickly with the imported 3D robot model, virtual joints, and virtual sensors, and then the navigation simulation can be carried out using the virtual prototype with the algorithm script in the virtual environment. Firstly, the scripts of the virtual revolute joint, virtual LiDAR sensors, and terrain environment are written. Secondly, the A* algorithm is improved for navigation in unknown 3D space. Thirdly, taking the Mecanum wheel mobile robot as an example, the 3D robot model is imported into Unity3D, and the virtual joint, sensor, and navigation algorithm scripts are added to the model. Then, the navigation is simulated in static and dynamic environments using a virtual prototype. Finally, the navigation tests of the physical robot are carried out in the physical environment, and the test trajectory is compared with the simulation trajectory. The simulation and test results validate the algorithm simulation method based on the redevelopment of Unity3d, showing that it is feasible, efficient, and flexible.

Navigation Simulation of a Mecanum Wheel Mobile Robot Based on an Improved A* Algorithm in Unity3D

Currently there is an increasing trend to implement functionalities that allow for the development of applications based on Cloud computing. In education there are high expectations for Learning Management Systems since they can be powerful tools to foster more effective collaboration within a virtual classroom. Tools can also be integrated with these systems that can provide assistance to students on any topic covered in class through the proliferation and popularity of publicly available Web APIs. However, generally most students and teachers still face technological barriers to access these resources and integrate them into their educational systems. This paper discusses an effort to overcome this problem by proposing a method of resource access through linked data, which is explicitly defined with semantic annotations related to the learning environment. Doing so, we are able to decorate the Cloud providers API's, thus providing easy integration into learning applications and important benefits for learning. The effectiveness of our approach has been measured and evaluated through usability methods and cognitive load theory principles.

http://openaccess.uoc.edu/webapps/o2/bitstream/10609/123266/1/Gutierrez_JETS_Integrating_Learning.pdf

Integrating Learning Services in the Cloud: An Approach That Benefits Both Systems and Learning.

Adoption of technology and Higher Education are two major driving forces, especially for emerging economies. Cloud computing is one such technology which is not only transforming enterprise businesses but also higher education. Adoption of cloud computing in the primary, higher and research-oriented education is playing an important role as far as ease of functionality, user support, cybersecurity, on-demand scaling, time-saving, and costing are the concern. Education institutions should be encouraged and mentored very well for the adoption of the technology-based teaching and learning to improve and overcome their operational and academic challenges, which will be a win-win situation for all stakeholders i.e. Educational Institutions, Government, Technology Companies. This research article introduces a conceptual framework for the adoption of Hybrid EduCloud in higher education. This study is based on Ethiopia, one of the SubSaharan African country. The qualitative research methodology was adopted to formulate Hybrid EduCloud model and the fivestep conceptual framework of cloud computing implementation strategies for higher education while quantitative research methodology was used for questionnaire survey in connection with five steps of cloud computing implementation strategy model. The result shows that this model can be an important contribution to boost cloud-computing adoption in higher education.

Hybrid EduCloud Model in Higher Education: The case of Sub-Saharan Africa, Ethiopia

The invention relates to a pneumatic spring vibration isolator of an air flotation type forward and backward swing concatenation mechanism based on a ball head connecting rod, which belongs to the ultra-precise measurement and processing field. An inner cylinder is assembled in an outer cylinder of the vibration isolator, an air bag for an air spring is sleeved outside the upper end of the inner cylinder, a support rod is arranged in the chamber of the inner cylinder after penetrating through an annular cover plate, and the upper end and the lower end of a diagonal cable wire are respectively fixed with the annular cover plate and the support rod to form a single swing mechanism; an upper ball seat and a lower ball seat are respectively arranged on the lower end of the support rod and the upper end surface of the air spring, and the upper end and the lower end of the ball head connecting rod are respectively arranged in the upper ball seat and the lower ball seat to form a reversed swing mechanism; and the single swing mechanism and the reversed swing mechanism form the forward and backward swing concatenation mechanism. The air spring is used as a reversed swing spring, and the rigidity of the reversed swing spring can be changed by continuously adjusting the internal pressure of the air spring, thereby the real time adjustment of the rigidity of the forward and backward swing concatenation mechanism can be realized to meet requirements of different operating conditions. The pneumatic spring vibration isolator is introduced by the forward and backward swing concatenation mechanism, which not only enhances the comprehensive vibration isolation performance of the isolator, but also overcomes many disadvantages of other types of isolators.

Pneumatic spring vibration isolator of air flotation type forward and backward swing concatenation mechanism based on ball head connecting rod

The article is devoted to the peculiarities of the practical use of cloud services for the organization of qualitative professional training of future specialists. It is established that in order to implement state policy, there is an essential need for using various ICT, in particular cloud services, which are not only economically acceptable in the new educational environment, but also a powerful tools of obtaining new knowledge, skills and abilities.
The advantages and disadvantages of using cloud services in the educational process of higher education are substantiated; the examples discuss the methods of using cloud services in the process of studying fundamental disciplines. The object of the study is the professional training of students in higher education institutions. The subject of research is the process of organizing professional training of future specialists with the use of cloud services. 
To achieve the set goals, a set of general scientific (analysis, synthesis, comparison) and specific scientific (bibliographic, problem-based) was used. Observation and conversation manipulation allowed to highlight the advantages and disadvantages of using cloud services and draw conclusions from the problem under investigation.
The foreign experience of using cloud services has been researched and the features of the application of traditional and distance technology training abroad have been determined.
It describes the use of the blog as a media-educational technology during the advent of pedagogical practice. The methods of using cloud-based services on the example of creation of a distance course “Linear algebra and analytic geometry” are considered.
The prospects of research, which consist in getting acquainted with cloud technologies of the humanitarian profile future specialists at the second higher education, are determined. It has been established that the practical application of cloud technologies in the educational process will promote more qualitative and progressive learning; the formation of a close interaction between the teacher and student; development of professional skills and abilities of independent work.

Practical use of cloud services for organization of future specialists professional training

Cloud computing has become the one of most popular vocabulary in IT areas recently. Cloud computing in university education information resources management application also becomes hot gradually. The paper introduces the basic concept of cloud computing. On the basis of the development outline of cloud computing, the author thoroughly discusses university education in cloud computing information resource management of three main problems which encountered in the cloud computing technique to university. Problems are described as below: the opportunities brought by cloud computing technology in college teaching management application, cloud computing library information resources management application and effects, and cloud computing technology in the application of distance education. Finally, this paper analyzes the problems which we must pay attention in education field application about cloud computing, and discusses the problems of modern computing clouds education influence.

The Application of Cloud Computing in Universities’ Education Information Resources Management

The invention provides a precise vibration isolation system which comprises a first layer of vibration isolator, a second layer of vibration isolator and a micrometric displacement detector; the first layer of vibration isolator is formed by connecting a first air spring and a magnetorhelogical fluid vibration isolation device in parallel, and the second layer of vibration isolator is formed by connecting a second air spring and a micrometric actuating element in parallel; the second layer of vibration isolator is arranged above the first layer of vibration isolator, and the first layer of vibration isolator and the second layer of vibration isolator are connected in series to be an integral; the micrometric displacement detector is connected with the magnetorhelogical fluid vibration isolation device of the first layer of vibration isolator, and the micrometric actuating element is connected with a vibration measurement sensor; a precise instrument is arranged above the second layer of vibration isolator and connected with the micrometric displacement detector by a vibration measurement light path. By adopting a double layer vibration isolation structure based on control by the micrometric actuating element, the invention can meet the requirement of the precise instrument on low frequency vibration isolation noise reduction and greatly improve anti-vibration capacity of the precise instrument.

Precise vibration isolation system

Magneto-rheological grease attracts the attention as a new kind of intelligent material. Under the external magnetic force, it is difficult to use traditional mathematics model to solve and analysis internal structure because of its complexity and polytropy. The modeling and simulation for complex system using computer becomes a good way to investigate complex system. Based on the electromagnetic theory and computer simulation, this paper constructed the model of shear stress to describe the characteristic of magneto-rheological grease that is to use body centered cubic pillars model to analysis the mechanism and characteristics of magneto-rheological grease. Using matlab simulink toolkit to compose the simulation program, simulate and analysis using theoretic model, and plot the shear stress curve of magneto-rheological grease with magnetic strength and particle size, and the shearing force under zero field. The simulation and experimental results indicate that the simulated shear stress curve is coincidence with experimental curve when the density of ferromagnetic particle is low, and it is lower than experimental curve when the density is high (the variation tendency is close), which verified the accuracy of theoretical model. It needs to improve the model by considering the still friction between ferromagnetic particles.

The Model and Simulation of Magnetorheological Grease Characteristics

Design of M-Learning Platform based on Cloud Computing

This paper described the characteristics of open virtual equipment platform LabVIEW, and introduced the method to construct data collecting system using this platform. And developed computer controlled monitoring unit of magneto-rheological grease conductivity, tested the relation between magneto-rheological grease conductivity and external magnetic field, particle concentration, and thickness of magneto-rheological grease. In windows system, the virtual instrument constructed by using LabVIEW programming implemented the real time measurement, display, record of conductivity output, analysis its conductivity characteristics, and fitted the output electric resistance data and determined the best fitting curve. The experiment certified that this method doesn't need complex programming, reduces the programming time, and simplifies the development procedure, and increases the flexibility of detection system.

Test Unit Design of Magnetorheological Greases Conductivity Research Based on Labview

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