Applied Mechanics and Materials Vols. 668-669

Abstract: Marine environment data warehouse can store massive data. After the full amount of historical data has been initially loaded, the incremental update mode must be applied to ensure timely updates of data. In this paper, in view of the marine environment data warehouse’s characteristics, such as massive data amount, large number of historical data and low update frequency, a complete set of mechanisms for incremental update of marine environment data warehouse was proposed to greatly improve the operating efficiency of marine environment data warehouse.

Abstract: Image acquisition and wireless transmission is a key technology in the Internet of Things. This paper reports a ARM Cortex-M4 processor hand-held based Image acquisition and wireless transmission terminal. The terminal utilizes STM32F407VGT6 as its master controller, respectively. It uses Nordic nRF24L01 as its wireless transceiver module and OV9655 as its camera module. The system works in 2.4GHz ISM microwave band and can capture images and wirelessly transmit images within 20m indoors and 50m outdoors. The actual measurement of image acquisition and transmission shows that this terminal is highly stable and comparable in 2.4GHz microwave frequency.

Abstract: For this paper, we analyze the achievable sum rate of zero-forcing (ZF) pre-coding and Maximum Ratio Transmission (MRT) pre-coding with Matrix Normalization in massive MIMO system with Imperfect CSIT. We compare the performances of these two pre-codings and find that ZF pre-coding outperforming MRT pre-coding in the high SNR region while MRT pre-coding outperforming ZF pre-coding in the low SNR region. Then we derive the threshold of the pre-coding selection and provide the procedure of pre-coding schemes selection.

Abstract: In recent years, near-space platforms become a major military power of research. Performance evaluation of System for a comprehensive optimization design has a very important role. For the current network-centric warfare environment information superiority significant impact on system performance, it establishes a whole process of near space information system performance evaluation index system. For the assessment of near space multi-level system performance, complexity, and other characteristics, a kind of multi-level gray comprehensive evaluation model phased approach is proposed. Using the approach for performance evaluation of near space system in information operations phase for example verifies the practicality.

Abstract: Our home is becoming more and more intelligentized. In the home network, the residential gateway plays a key role in the data interchange between external networks and home network, this paper proposes an idea that the home network should guarantee a unique visiting interface. Furthermore, this paper designs and implements the central forwarding mechanism of the residential gateway, and exchanges between outer networks and home network must be through the residential gateway. This paper is of valuable reference for network researchers and engineers to be engaged in the further study on the home network.

Abstract: This paper presents a study of an intelligent augmented reality tourist guide application aiming to run on Android smart phones. The strategy for positioning the target scene and intelligent planning strategy of tourist routes are proposed. Some important parts in the system implement stage are also described in detail. The results of a follow-up user study show that the intelligent augmented reality tourist guide application is very helpful for tourists, particularly enhancing self-guided tours and improving tourists’ experience in their touring.

Abstract: Retracted paper: Many theorists would agree that, had it not been for the emulation of 802.11b, the simulation of digitaltoanalog converters might never have occurred. Here, we validate the understanding of multicast solutions. In this work, we validate not only that A* search and Btrees can synchronize to address this problem, but that the same is true for the UNIVAC computer.

Abstract: In recent years, microblog has become one of the most popular social tools for the majority of Internet users. More and more people are actively sharing information with others, expressing their opinions on microblog. The microblog messages which they share usually have emotional tendencies, which are positive, negative and netural. In this paper, we judge emotional tendencies by analyzing sina microblog messages and focus on the calculation method of text emotional tendencies.

Abstract: Entertainment places have special structure; large fire load, personnel-intensive features, and function layout often change in the process of operation, so the fire risk level will change frequently. The current fire risk assessment studies for only one stage in entertainment places without considering the impact of risk factors at different stages. For this situation, this paper presents a fire risk assessment method in entertainment places based on full life cycle, divides the entertainment places into different stages, analyzes risk factors at different stages, and then uses the method of Gustav to get the fire risk levels of different stages. The assessment results show that the level of fire risk in entertainment places are different at different stages, you can take the appropriate risk control measures against fire risk factors at different stages, which has important guiding significance for fire risk management in entertainment places.

Abstract: With the development of construction engineering, multifarious structure and component, together with numerous composite components of different material, appear continuously. In the light of the concentric compressed state of components of masonry and concrete and from the perspective of collaborative working of two kinds of materials, this paper discusses the issue about the value for intensity design of two kinds of materials.