Key Engineering Materials Vols. 460-461

Abstract: Aiming at the need of on-line performance monitoring and fault diagnosis for diesel generator system, an on-line data acquisition, analysis and diagnosis system based on portable industrial computer, different function sensors and PCL-818HD data acquisition card was constructed. Its design of hardware, software and its test and diagnosis method were given in this paper. Through the vibration signal analysis and on-line fault diagnosis example of generator system, it shows that the diagnosis system can realize on-line performance monitoring and fault diagnosis for diesel generator system.

Abstract: Energy-recycling output pad cells for driving adiabatic chips are designed, which have been fabricated with Chartered 0.35um process and tested. The proposed energy-recycling output pad cells include mainly bonding pads, electrostatic discharge (ESD) protection circuits, and two stage energy-recycling buffers that are used to drive the large load capacitances on chip pads. The two stage energy-recycling buffers are realized using CPAL (Complementary Pass-transistor Adiabatic Logic) and PAL-2N (pass-transistor adiabatic logic with NMOS pull-down configuration), respectively. For comparison, a conventional output pad cell is also embedded in the test chip. The function verifications and energy loss tests for the three output pad cells are carried out. The energy consumption of the proposed two energy-recycling output pad cells has large savings over a wide range of frequencies, as compared with the conventional CMOS counterparts, since the energy on large load capacitances in the chip pads can be well recycled.

Abstract: Power-efficient multipliers are essential for micro systems, where low-power signal processing hardware is demanded. This paper presents an adiabatic array multiplier based on PAL-2N (pass-transistor adiabatic logic with NMOS pull-down configuration) circuits. It is composed of a multiplier array containing partial product generators and 1-bit (half and full) adders, and a final carry-lookahead adder. For comparison, a conventional array multiplier is also implemented. Full-custom layouts are drawn, and HSPICE simulations are carried out using the net-list extracted from their layout. The adiabatic and conventional array multipliers have been embedded in a test chip, which have been fabricated with Chartered 0.35um process and tested to verify its function.

Abstract: The present thesis puts forward a hierarchical P2P model: self-adaptive P2P model of two-level. Super peers compose a self-adaptive DHT network on the top layer, and lower ordinary peers take super peer in the same group as their center server to form a cluster. Data are stored in ordinary peers and super peers hold indices of data and answer for request from ordinary peers. When super peer join or leave, it does not maintain consistency of entire network’s logic topology but only update routing table of its predecessor and successor, besides, super peers update their routing table cache when they transmit messages. The ordinary peers keep backup of super peer for system restore when super peer fails. System can optimize network structure by select peers with high capacity to be super peer and restrict amount of peers in each group.

Abstract: This paper presents a new method using PSO for face detection, which does not utilize training samples. The method is based on the edge density of the image. In the preprocessing stage a face is approximated to a rectangle. Then PSO algorithm is applied to search for the best rectangle region. The rectangle area with best fitness value will be detected as the face region. Simulation results show that this PSO-based method is convergent and effective, especially for the case of images with the non complex background.

Abstract: Aquiculture wastewater, which is rich in nitrogen and phosphorus, is a main reason for the eutrophication of the surrounding water and is always a problem for the sustainable development of aquaculture. Although many treatments have been used in the field, the expensive cost limited their wide application. Microalgea is one of the most potential biomass materials for the renewable energy. However, over expensive cost, especially the raw material cost limited its industrialization. Microalgae can utilize the N and P in the wastewater to grow, so it is feasible to remediate the wastewater by microalgae and produce the biomass energy of microalgae from the wastewater. The present paper studied the growth of Isochrysis zhanjiangensis in three aquiculture wastewaters and optimized the cultivating condition. The research showed that Isochrysis zhanjiangensis could grow in the wastewater from the culture of Cynoglossus semilaevis. Under the condition of pH7, illumination 5000 LX and original inoculation density 0.01 mg/mL, the microalgae had the best growth. Under the optimal condition, the microalgae could eliminate 78% active phosphorus, 100% ammonia nitrogen, 62.3% nitrite nitrogen and 84.7% nitrate nitrogen in the wastewater within 11 days, which suggested that it was a good method for microalgae to cultivate in aquiculture wastewater because it could not only bioremediate the wastewater but also produce the biomass material.

Abstract: A two-stage synthetic method for accurately realizing the track was presented according to the characteristic of controlled mechanism of two degrees of freedom and mechanical character of controlled driving component. An optimized model of controlled mechanism that can accurately realize the track of many points was built. Using the method of generalized inverse based on windows solves the displacement, velocity and acceleration of compensation movement. Controlled mechanism was simulated and analyzed by using visualization way etc. It provided a reliable and practical work platform for researching and applying controlled mechanism.

Abstract: The conservation of historic stone buildings and sculptures is receiving growing attention from many fields because of increasing bad weathering. At present, special attentions are paid to development of new protective materials. In this paper, we review that some findings of crude protective film of biomimetic materials on the historic stone buildings and sculptures, discuss their biological origin, and propose an approach to prepare the protective agents through the biomimetic method. Moreover, an overview of the Principle of biomineraliztion and biomimetics syntheses is provided. Thus, it is dedicated that the biomimetic synthesis should have great potentialities in applied protective methods and should represent a new prospective in stone conservation.

Abstract: Knowledge management modeling is foundation of knowledge management practice. Previous work of knowledge management modeling is mainly about concept architecture. Its tools and methods are not strong. This paper suggested a new knowledge management meta-model based on the analyzing and integration of knowledge management model. The core of the meta-model includes organizational structure, business process, resource and knowledge. A knowledge management definition language (KMDL) is proposed, which defines a least set of knowledge management modeling components and properties. It also offers a shareable exchange format in common sense. Based on the meta-model and KMDL, we developed a knowledge management modeling tool.

Abstract: A novel multi-agent particle swarm optimization algorithm (MAI'SO) is proposed for optimal reactive power dispatch and voltage control of power system. The method integrates multi-agent system (MAS) and particle swarm optimization algorithm (PSO). An agent in MAI.SO represents a particle to PSO and a candidate solution to the optimization problem. All agents live in a lattice-like environment, with each agent fixed on a lattice-point. In order to decrease fitness value, quickly, agents compete and cooperate with their neighbors. and they can also use knowledge. Making use of these agent interactions and evolution mechanism of I.SO. MAPSO realizes the purpose of' minimizing the value of' objective function. MAPSO applied for optimal reactive power is evaluated on an IEEE 30-bus power system. It is shown that the proposed approach converges to better solutions much faster than the earlier reported approaches