Applied Mechanics and Materials Vols. 182-183

Abstract: With the tremendous growth of self-service technologies (SSTs) in many industries, SSTs in service provision are recognized as more effective and important technologies to minimize investment costs and maximize service quality. By means of reviewing and integrating literature in several fields, the present paper attempts to provide an understanding of links between SST characteristics, consumer propensity towards SST usage, social pressures, and SST adoption. This paper also advances 14 tentative propositions for additional research and develops a conceptual model to predict and explain consumer attitudes and intentions towards SST usage. Besides the need for empirical confirmation of the propositions given, finally, there are several practical implications for service marketers and future research directions for scholars.

Abstract: This paper presents an intelligent monitoring system based on a ZigBee-base wireless sensor network. The proposed system includes a sensor network configuration module, an expert system shell, and an event-condition-action (ECA) engine. The sensor network configuration module is used to configure the working properties of the ZigBee components and set up the monitoring network. The expert system shell enables users to define the related events occurred at system running, the threshold of working conditions for triggering the corresponding events, and the required commands for fitting the system. The ECA engine is used to monitor the system and provide a suitable command for system fitting in a specified event being fired. The proposed system enables user to quickly establish a wireless sensor network system without well-experienced knowledge about the wireless sensor network and the expert system.

Abstract: Residential district street lamps are important public safety facilities for night illumination. Residential district street lamps are numerous, consume a great deal of power, and are difficult to repair and maintain, as they require high costs in both time and labor to maintain individual luminance and a steady power supply to both the system and the lines. An automatic monitoring maintenance management system for street lamps is put forward in this study, which maintains changes in the loop currents of street lamp switch boxes, and uses the function of GPRS to send detected current change values to a control center in order to identify failures of street lamps of different loops, thus, both the cost of maintenance labor and maintenance time can be greatly reduced. The switching of street lamps can be controlled by a control center, and the utility management of energy and safety of the public can be effectively improved.

Abstract: The atomization process of liquid droplet is an important stage in the fluid movement process in the jet exhausting atomization nozzle. This stage is directly influenced on the diameter and desperation of water droplet. Today two-dimensional model is often used in the most common simulation framework. But the atomization process in nozzle is usually happened in the three-dimensional model, so the results are not quite agreed with the practice. In this paper, a new three-dimensional model was proposed to study the mechanism of the atomization process. After applying the VOF method and turbulent model in CFD software Fluent, a numerical simulation was performed to analyze the mechanism of atomization process and some related factors affecting the atomization. Results indicated that the shapes of atomization were accorded with experimental investigations. According to the results, the necessity of further characteristic parameters on the atomization process was analyzed.

Abstract: Severe weather is a threat to flight safety and the main reason for delays. Rerouting strategy can effectively avoid severe weather, and rerouting path planning is a key issue of rerouting strategy. Aiming at the free flight, an improved artificial potential field model was used to generate a single flight rerouting path. Then genetic algorithm was used to select the best flight path from multiple paths. Finally, a numerical example was carried out and the relevant parameters were analyzed. The results show that the artificial potential field and genetic algorithm can achieve optimum rerouting path, and the relevant parameter values must be in a certain range to get the optimum solution.

Abstract: Three-dimension scene simulation technology of virtual environment maybe widely applied in many fields such as city planning, tourist industry and virtual battlefield. The technique has been applied to the research of “Digital Museum” which can provide a new research topic in the today’s world. In allusion to the problem of Digital Museum GUI, Three-dimension Digital Museum modeling database and virtual scene is constructed through Maya; application environment is realized which using JAVA programming technique based on windows plat; some key technologies about how to realize the system are introduced, including building of 3D modeling databases, Multi-Texture based on Blaxxun/BS, Models simplification and validated them. The paper formed research and exploiting methods and technologies, which provide strong support of Digital Museum services system.

Abstract: The new method has been proposed based on the comparison and analysis of the traditional methods for measuring rotating speed. It can guarantee real-time property with radial gratings at measuring low speed. It is clearly explained that the fundamental principle for measuring rotating speed and characters of the method and presented the constitution of the system hardware and the process flows.

Abstract: This paper introduces a novel GA-based algorithm for location of moving time-harmonic magnetic dipole. Based on the function of propagation of underwater electromagnetic wave, the new location method with the amplitude of the electromagnetic wave picked out from receiving signals is proposed. According to the overall search ability of the genetic algorithm, the passive location of the radiant point about the time-harmonic dipole was achieved by the using of characteristic quantity of the amplitude. The result of the simulation validated that: within the underwater measurement distance, higher precision of passive location can be achieved by using the method based on genetic algorithm.

Abstract: Time-delayed variables is of potentially critical impact on product quality within the processes of Metallurgical industry, Aviation industry and Chemical industry. It is very important to detect the sensor fault and estimate the values of time-delayed variables immediately as soon as faults occurred. Any fault of the time-delayed variable implies that a detrimental effect on the process will go unnoticed until the next sample become available. During this time, of course, poor quality product continues to be manufactured, a situation which is clearly unacceptable from a cost-effectiveness point of view. For nonlinear process with time-delayed variables, kernel partial least squares is introduced to monitor and estimate the fault of the Tennessee Eastman benchmark. Simulation results demonstrate the effectiveness of the proposed algorithm.

Abstract: A novel design methodology for multipliers to reducing both active leakage and dynamic power using dynamic power gating is presented, where sleep transistors are inserted between the real and virtual ground rails of various parts of the multiplier which could be selectively turned on/off. On-chip sleep signals are generated from one input signal of the multiplier which has larger dynamic range. By detecting the magnitude of the input signal, the idle parts of the multiplier are identified and the power gating schemes are dynamically applied even when the multiplier is performing useful computation. Simulations show that the total power dissipation of the proposed multiplier could be reduced up to 39.3% in a typical DSP application.