Advanced Materials Research Vols. 268-270

Abstract: Now many customers browse a large number of online reviews to know others’ word-of-mouth about products and services prior to making their decisions. Meanwhile customer reviews serve as a feedback mechanism that can help suppliers improve their products and services, gaining competitive advantages. Specifically, product feature extractions from reviews are expected to further investigate the views and attitudes of customers. This study aims at analyzing Chinese customer reviews. Our approach was based on a recently introduced mining approach, and adding infrequent feature to the candidate features dataset by the algorithm proposed in this paper. Experiments were conducted using the reviews download from Internet as datasets. Empirical results proved that in Chinese reviews feature mining, it is not appropriate for add the infrequent features.

Abstract: To protect digital evidence during Computer Forensics, the measure of protection digital evidence was analyzed, and a project of protection digital evidence (Digital Evidence Protection System, called DEPS) was designed. In this paper, the framework and element of DEPS was introduced, and the mechanism of multi-digital-signature and digital time-stamp of DEPS was described.

Abstract: The article analyzed national aesthetic theory and emotion thinking.The culture system of Heiyi zhuang national minority costume is emotion expression for this national labor people. Heiyi zhuang costume culture was famed ‘living fossil’ of zhuang culture. Heiyi zhuang’s special color aesthetic conscious of making and dyeing cloth have very high lever aesthetic value, and reflecting the history continue of national tradition aesthetic culture system.

Abstract: A monitoring and alarm system for the ship’s engine room based on CAN bus is introduced in this paper. The paper describes the sensors and signal processing circuit used in the monitoring and alarming system in detail. Analog isolated measurement modules is designed in order to avoid damage to the interface circuit of the system. To get the greatest possible reliability in communication, protection circuit is increased to the CAN bus and implemented on the CAN bus physical layer redundancy.

Abstract: As the multi-DOF ship motion in the ocean, the ordinary satellite antenna can not be normal used on the ship. A ship-borne automatic tracking system is introduced in this paper. First, the MCU will calculate the satellite antenna pointing solution according to GPS and electronic compass, and then will drive the motors to specified angle according to the azimuth, pitch angle and polarization angle. Finally, the antenna system will track the satellite automatically according to three-axis gyro sensor signals. In order to overcome the sensor drift and get better satellite tracking precision, a conical scan algorithm is used in the tracking system.

Abstract: In this study, it is based on the processing theory and equipments for Chinese fermented meat products and western fermented meat products. The result shows that lactic acid bacteria in the process of manufacturing fermented hams have always been in the state of dominant bacteria and maintained a high level. From whether nitrites can decompose protein and fat, etc. aspects conduct strain screenings, and the result shows that, LP and Pc can be used as starters of hams. Although the lactic acid streptococci (St) and La do not break down fat and protein, their resistances to salts and nitrites both are very poor, not suitable for starters of manufactured meats.

Abstract: Compared with traditional three-phase motors, six-phase induction motors due to their high reliabilities and low DC side voltages can achieve high power drives using devices with lower voltage level. In this paper, it analyzes the research status of six-phase induction motors, introduces the winding structures of six-phase induction motors, and finally designs the vector control system for six-phase induction motors taking the Digital Signal Processor (DSP) as the core. It introduces DSP circuit implementations, emphasizes to describe software structures of the control system, and proposes a detailed software flow chart.

Abstract: Now, the complication and systemization of the industry is increasing day after day, which make it hard to design the motion control system. However, the technology of field control is increasing, and the motion control system based on the network is widely used. The company of beck Hoff introduced the Ether CAT network, which can be configured easily, and the speed of communication is high, and in some way, the technology has become the focus of the studying the automation. This paper analyst the application for the Ether CAT in the multi-axis motion control system.

Abstract: Power consumption models for low-power wireless communications, where transmitter and receiver electronics power consumption is comparable to PA power consumption, are based on channel path loss, depending on distance between transmitter and receiver, making them suitable for energy-efficiency consideration of multi-hop vs. single-hop communication. We propose L – model, based on total channel-loss, that is more suitable for transmission energy consumption optimization in the sense of different modulation and coding techniques than d – models. Since total channel loss information is available at current transceivers in terms of RSSI and LQI, L – model is more suitable for TPC techniques optimization than d – models.

Abstract: An image watermarking algorithm using Least Significant Bit is presented. Firstly, Logistic chaotic map is utilized to generate embedding bits for the watermark. Then, the discrete cosine transform is performed on the host image, and the hiding bit is embedded in the coefficient of discrete cosine transform by replacing Least Significant Bit, which causes minimal distortion of the host image.The original host image is not required when extracting the watermark . Experimental results show that the watermarked image almost has no difference from the original host image, and the quality of the extracted image is satisfying, the capacity of this algorithm is high. This algorithm is robust to many attacks, such as noise attack, JPEG Compression attack. Introduction