Advanced Materials Research Vols. 271-273

Abstract: The datacenter of one university owns massive E-Learning resources, and how to support safe and efficient access so as to support large-scale concurrent read and write protection has troubled the administrators of the campus datacenter. In this paper, we presented our E-learning resources storage system. The resources are stored in one HDFS(HADDOP Distributed File System) based storage systems, to effectively support the E-learning scenarios as small write-once files with large-scale concurrent read scenarios. Within the System, the E-learning data can be deployed redundantly across multiple storage nodes, which are distributed so as to improve read and write speed. Furthermore, when a single data node fails the system can also be recovered by redundant node data in the system and improve system security greatly. The system supports that the desktop systems, mobile platforms and web browser can access the system with cross-platform mechanism. The system adopts encryption mechanisms through the establishment of secure storage directory, and the user terminal can encrypts and unencrypts the user-files with offline mode to guarantee the safety of user data.

Abstract: Virtualization technology has revolted the computer technology. In the paper, we present our virtual computer cluster. The components of computer cluster have been improved by virtualization technology from the actual computer server to virtual server instance. Virtual computer cluster includes front-end machine and the cluster nodes. The front-end machine can be physical machines or virtual machines; the cluster node can also be virtual or physical machine node. The front-end machine of the cluster communicates with the cluster nodes through physical or virtual network adapter. The front-end machine connects with the cluster management software in each node so as to monitor and control every physical or virtual node within the cluster. A single virtual computer cluster extends its resources with adding physical or virtual resources including computing resources, storage resources and etc. within secure and stabile occasions with special needs. The technology can be widely applied to cluster and parallel computing demand but with lower-cost system design scenarios.

Abstract: Experiment teaching plays an important role in training new type talents; however, there is a big disparity between our current experiment teaching system and our teaching target. The paper analyzed the existing deficiency in current experiment teaching, and provided practicable reform measures according to the experiment teaching characteristic and law, such as update the thinking mode of experiment teaching, innovate the experiment subjects, change the directing experiment, reinforce the laboratory software and hardware building, pay attention to the experiment teachers` quality cultivation and enhance the link between experiment teaching with the practical engineering. These reform measures will enable the students to fully consolidate and master the knowledge; at the meantime this method will mobilize the exploring spirit of self-study, improve their creative thinking and scientific research ability, as well as promote the improvement of students` engineering practice ability and comprehensive quality. With all the above-mentioned advantages the students will with high employment competition, and finally be the real beneficiary of education and teaching reform.

Abstract: Training applied talent is the goal of current college. Several common experimental teaching methods, such as 1 × N Class -Team Teaching Model, N × N Class-Team Teaching Model, N × N Teacher-Team Teaching Model, are analyzed and compared. These experimental teaching methods have some disadvantages, which are that the ratio of teacher-student is small, or teacher professional expertise is not conducive to student’s comprehensive knowledge. A new experimental practice teaching model is given, which is Double Teams Model of Teachers and Students (DTMTS) experimental practice teaching model. This model can be used in course practice training, students’ research training and academic competition training. The implementation process of this model are teachers team building, students team building, to carry out experimental method of teaching practice, experimental practice teaching organization, the team teaching process management, strengthen the hardware platform construction of experimental practice. Its implementation can improve student’s participation in practice and innovation ability.

Abstract: According to the ambiguous definition of Information Engineering Specialty (IES) and its weakened characteristics in Shijiazhuang Tiedao University, the research determined the specialty’s orientation based on the educational goal, and reformed correspondent curriculum system by constructing several course groups. In this paper, as an example, we select and focus upon the development of signal and information processing course group, which is the most important operational part to guarantee our educational objective of IES, namely thick foundation, broad range, strong ability and high quality. Along with amendment of theoretic contents in teaching, we also proposed an experiment instruction modal to strength students’ practical ability in information engineering. In the end, a new curriculum framework was built. Through specific result, the proposed curriculum reform method is proved to improve our cultivation quality and the students’ professional competence.

Abstract: The main aim of this article is exploring the electronic circuit education with multimedia classroom. Firstly, we declared that it is one of multiple teaching methods. On the basis of it, according to the inner character of electronic circuit curriculum, we studied the means of teaching the emphasis and difficulty using MultiSim simulation platform. In the end, we give two simulated cases to demonstrate the way of curriculum implementation.

Abstract: A chaotic digital watermarking scheme based on logistic mapping was introduced. In the frequency domain, the chaos sequence embedded in DC component DC through using discrete cosine transform (DCT). Being of human visual system(HVS) masking properties, the watermarking adapt itself into the image, which ensure the watermark is invisible.

Abstract: A chaotic digital watermarking scheme based on logistic mapping is tested by experiments. Being of human visual system(HVS) masking properties, the watermarking adapt itself into the image, which ensure the watermark is invisible. Experimental results show that the proposed algorithm has good robustness for the common signal distortion (adding salt & pepper noise, median filtering, etc.) and geometric distortion (lossy compression, shear, etc).

Abstract: The influence of grain size on the lattice constant in some nanocrystallites of perovskite structure was studied in experiment. Some nanometer ultra fine particles of CaMnO3, Nd0.67Sr0.33MnO3 and Nd0.67Sr0.33Mn0.9Cu0.1O3 were prepared by sol-gel method, which were characterized by XRD, thus phase compositions, lattice constants and grain sizes could be obtained. It was found that their lattice constants all decreased with the decreasing grain sizes. In the end, this phenomenon were explained by the binding energy theory.

Abstract: By the questionnaire, the physics course’ establishment and the teaching present situation are investigated in the science & engineering professions of the secondary vocational schools in Tangshan. The results indicate that the physics courses’ establishment cannot meet the specialized need by far, moreover, many problems exist in the established physics courses. Thus, physics courses’ effective educational model and teaching method's reform are imperative.