Advanced Materials Research Vols. 219-220

Abstract: Deadlock is a common problem in concurrent processing where two or more processes compete for resources in mutually exclusive way to access critical resources. The in-depth analysis and discussion about deadlock would be conducive to the improvement of reliability of the operating system. In this paper, problems about deadlock is analyzed and overviewed, including concept, cause of the deadlock, and prevention, avoidance , detection, and recovery from deadlock, etc .

Abstract: This paper has explored the design of three-dimensional imaging sonar software and its application to the hardware platform. In the process of designing, the software has been optimized in view of characteristics of the hardware structures and calculation of the TMS320C6416, and the specific optimization methods and effects have also been presented. It turns out that the effect of software optimization is obvious and the working system stable and reliable.

Abstract: An important issue in deploying a WSN is to provide target coverage with high energy efficiency and fault-tolerance. Sensor nodes in a wireless sensor network are resource-constrained, especially in energy supply, and prone to failure. In this paper, we study the problem of constructing energy efficient target coverage based on Cliffford Algebra . More specifically, we propose solutions to forming k-connected coverage of targets with the minimal number of active nodes based on Cliffford Algebra. We propose two heuristic algorithms to solve the problem. We have carried out extensive simulations to study the performance of the proposed algorithms. The evaluation results have demonstrated their desirable efficiency.

Abstract: In order to enhance the capability of anti-jamming and Low Probability of Intercept (LPI) of radar system, spread spectrum signals are designed for modern radar system. Emission signal is coded with PN codes at the transmitting terminal. Spectrum of signal is spreaded and multi-signal mixed together, so it is not easy to intercept. At the receiving terminal, undesired signals are spreaded when dispreading desired signal. Signal to noise ratio (SNR) of the received signals is raised after despreading, so the detection range broadens. Computer simulations verify the good performance of the proposed approach.

Abstract: To improve production quality and reduce machining time, machining parameters need to be monitored and adjusted automatically in milling. An integrated controller which is modular, configurable and based on OMAC, is established. The hardware platform, resultant cutting force constraint and its fuzzy control rules have been introduced in detail. In the fuzzy controller designed, two inputs and one output are used with five fuzzy sets for the controller, and the output rate of feed-rate can be changed from 50% to 200%. This controller has the abilities of reducing fluctuation range of cutting force, adjusting feed-rate intelligently, which is a part of CNC system. The experiment results show it can realize the real time status monitoring with this system, reduce the cutting force fluctuation, and adjust the feed-rate intelligently during machining.

Abstract: A simple image restoration scheme based on watermark is proposed in this paper. In the watermark scheme, an image is divided into multi-blocks. Repeat correcting code is adopted to be a copy of the most significant bits (MSBs) which will be selected as watermark that embedded into the least significant bits (LSBs). There are two shares of MSBs and scattered in the LSBs within other blocks. In order to avoid tampering coincidence and to improve the ability of restoration, the distance among the original block and other two blocks that their shares belong to is optimized as long as possible. The experiments indicate that this scheme is simple and easy to implement and the smaller the tampered area, the more pixels in the tampered area can be recovered correctly.

Abstract: Fractal theory was used to study the rules of Yellow River’s food happening. The author put forward a method, grid method, to calculate the riverway’s fractal dimension. After comparing the fractal dimensions and flood peak discharges of the Lower Yellow River parts, some helpful conclusions have been achieved. At a certain scale range, riverway of the Lower Yellow River shows some fractal characteristics, that is self-similarity. The fractal dimension of the Lower Yellow River changes with the flood peak discharge. Usually, the bigger the fractal dimension, the more curving the river way, the bigger the flood peak discharge, the bigger the possibility that flood happens. As a result, the fractal dimension can be regarded as a quantitative index to predict flood.

Abstract: This paper describes hardware design with mechatronics method for gene PCR Probes and analyzes its sub-channels. The temperature sensor is mounted in each sub-channel, and the signals from sensors pass through amplifiers, voltage adjusting circuits and inversing proportion circuits into converter. The heater channels consist of six thermoelectric heat pumps. For each channel, the two heat pumps which contain 71 thermocouples are connected in PCR series. The approach focuses on the use of sensors and actuators to improve the precise of complicated real-time control system. The experimental results show that the resultant curve of the performance of the heat pumps appears as an inverted parabola.

Abstract: This paper researches on a simulation model based on the physical process, which is consisting in modeling and simulation.

Abstract: This paper is based on the theories of consumer market segmentation. With the use of Cluster Analysis and regarding the characters of media market, the article also analyzes the Index System of Audience Structure. With the help of SPSS statistical analysis software, we will set a new analysis system about media audience structure, which has multiple indicators. In addition, there is one specific case about classification and structure of the television audience.