Improved WPAN meshed adaptive tree routing algorithm

To expand network coverage and enhance the reliability of wireless personal area network (WPAN), the problem of address overflow resulting from applying the meshed adaptive tree algorithm in large scale mesh network wis studied. By dividing the entire network into smaller sub networks, the subarea meshed adaptive tree wis constructed. An improved meshed adaptive tree routing algorithm wis proposed employing the hierarchical topology structure of the subarea meshed adaptive tree. Experimental results show that the algorithm expands the network coverage without increasing the routing overhead and the network load. It also effectively reduces the end to end delay and increases the packet delivery ratio and communication efficiency. It maintains a good performance in the networks with different scales and provides a theoretical basis for enhancing the coverage and reliability of WPAN.     

MAC of IEEE802.11 b

IEEE802.11b LAN use wireless media to transmit information. Since the wireless media is more complex than wired media, the MAC layer access controling mechanism of IEEE802.11b is more complex. The thesis describes the MAC layer access controling mechanism of IEEE802.11b--CSMA/CA(carrier sense multiple access/collision avoid) and two implementation modes,which are DCF(distributed coordination function) controling mode and PCF(point coordination function) controling mode. At the same time, the thesis simply introduces the error controling problem.     

A parallel cluster algorithm for self adaptive particle swarm optimization

Full scale data mining, such as in cluster problems, requires large numbers of computations. A parallel cluster algorithm for self adaptive particle swarm optimization was proposed to deal with this problem. The proposed parallel particle swarm optimization algorithm reduced the impact of the initial conditions via parallel searches of the globally best position amongst a varied population. Task parallelization and partially asynchronous communication of the algorithm were employed to decrease computing time. Furthermore, if combined with the characteristics of self adaptive and dynamical optimization parameters of the parallel particle swarm algorithm, the problems of particle mobility loss and the end of evolution could be dealt with successfully. When modified thusly, the algorithm maintains individual diversity and restrains degeneration. The simulation experiments indicate the algorithm helps increase computing speed and improve cluster quality.     

Adaptive clonal competition algorithm and its application in automatic electroplating production line scheduling

Aiming at small batch and multi-type electroplating production scheduling system with flexible process, an adaptive clonal competition algorithm(ACCA）is proposed. The capability of searching the global optimal value and the local optimal value of the new algorithm can be adjusted through the function between the cloning and mutation probability and the number of iterations. Besides, the population diversity of the adaptive clonal competition algorithm can be ensured through the competition mechanism, the elite migration mechanism and the raising new members mechanism. Compared with traditional clonal selection algorithm, adaptive clonal competition algorithm has higher searching ability and faster convergence speed.     

An Empirical Research on The Relationship Between Board of Directors Governance and Corporate Performance of Chinese Public Companies

Board of directors is an important component part of corporate governance. As a governance mechanism, we empirically study relationship among the scale of the board of directors, the structure of the board of directors and the duality leadership structure with corporate performance in Chinese public companies. The result shows that the scale of the board of the directors is smaller, the performance is better. With the ownership structure changes better, the structure of the board of the directors will change better and promotes the performance. The duality leadership structure doesn't affect the corporate performance. The fundamental method for the governance effectiveness of the Board is to set up the reasonable ownership structure and the marketing mechanism for occurrences in human.     

Analysis of a New Distributed-Pump Scheme Applied in District Heating Network

It is helpful for energy efftciency to use distributed pumps instead of valves to regulate hydraulic balance in a district heating system (DHS). A new scheme of distributed pump-system is presented based on performance comparison of hydraulic regime and power saving of single-heat-source dendritic pipeline networks with regulating valves and/or distributed pumps. Supposing that the new scheme was employed in multi-sources looped-pipe network, theoretical analysis and case study were carried out to evaluate off-design performances including hydraulic self-regulation, supply water temperature stability and power-saving potential. The results indicated that the proposed scheme would contribute to minimizing power consumption, retarding water temperature change, and would be convenient to adjust the quality and quantity independently in the looped-pipe heat supply networks.     

MPF-MMAC：A novel wireless sensor network MAC protocol

A novel cluster expanding and scheduling strategy is put forward,and then a multi-channel medium access control (MAC) protocol is designed for wireless sensor network (WSN) applications that ask for high network throughput and low transmission delay. The proposed MAC protocol based on TDMA can effectively improve throughout and channel utilization with a controllable hybrid channel access method. The protocol is simulated with OMnet++ software and the outcomes show that the protocol has good throughput performance and low delay time.     

Curve fitting of main section for subsidence basin by observing data

The existing section function for mining subsidence prediction has several shortcomings, such as complex expression, uncertainty of coordinates origin and parameters in application. The features of observing data in the ground subsidence of rectangular goaf are studied and a new fit function of main section is proposed for mining subsidence prediction.This new function has some merit that the mathematical formula is simple and the parameter is also easy to identify in practices. It is proved that the results of this new function is fit well with on site survey .     

Metadata prefetching based on 3 gram model and datamining technology

An efficient and accurate metadata oriented prefetching scheme is critical for achieving the best metadata service performance in large distributed storage systems. Most previously developed algorithms, however, do not consider the characteristics of metadata, such as small size. In light of this issue, we presented a 3 gram based model and datamining technique to use the traces of metadata accessing to prefetch groups of users’ future metadata operations. By using large trace driven simulations in which our new prefetching scheme was adopted, it is shown that the hit rate for metadata access extracted from the traces can be increased by up to 3.9% and 16 % compared with NEXUS and least recently used(LRU), respectively.     

New Monitoring and Assessment Method for the Joints of Steel and Concrete Connection in Large span Bridge

The joints of steel and concrete (JSC) is the key substructure to composite bridge, the method of condition monitoring and safety assessment were carried out for JSC with perfobond shear connectors (PBL) and local prestressed tendon in large span bridge. According to the damage mechanism of JSC, new monitoring parameters were proposed. The sensor location layout and the assessment thresholds of PBL were addressed with the consideration of the disadvantage influences of environment, load and concrete creep to local prestressed loss assessment and validated by the static load experiment. Compared the experimental results with field monitoring data, it was found that the new monitoring parameters and new assessment method were feasible and can be used as reference to the same type connectors in large span bridges.     

To maintain maximum throughput IEEE 802.11 DCF protocol power control mechanism

Transmission power control has been extensively used not only to save energy,but also to improve the network throughput in wireless ad hoc networks. A new adaptive power control algorithm,i.e.,PCMAC algorithm,based on IEEE 802.11 DCF protocol for Vehicular Ad hoc networks is proposed. According to the communication status,the algorithm dynamically adjusts the transmit powers of the CTS frames of receiving nodes and the data packets of the transmitting nodes,furthermore,adjusts the transmit powers of the RTS frames of the transmitting nodes according to the optimal number of access nodes such that the network throughput is maximized,in order to avoid conflicts and increase throughput. The simulation results show that the proposed PCMAC (power control media access control)algorithm can not only decrease the average energy consumption so as to prolong the lifetime of the network,but also improve spatial reuse of the wireless channel so as to improve the average throughput of the network.     

Internet Telerobotics and Its Applications

According to a new trend of telerobot control, some key techniues are researched to solve the Internet telerobotics , such as distributed intelligent computation on the Internet, human-computer interface,and Internet-robot interface etc.The current development status of the Internet telerobotics is reviewed. Based on the new directions of the network software development, the authors discuss that the middleware technique CORBA plays an important role in solving the problems of the Internet telerobotics,and it is an effective way to use Java language to control the telerobot and improve its system performance. The application perspective of the Internet telerobotics is investigated.It is indicated that the development trend of the telerobot control is a human-centred collaboration mechanism of mutual reinforce and coordination in human-machine intelligent.     

A Method of Adaptive Fuzzy Classfication on Rockmass Blast Ability

This paper presents a series of targets which are usefull for engineering.The paper also presents an adaptive weight function according to the fail mechanism of rockmass and a fuzzy aynthetic evaluation medel on rockmass blast ability.The model is applied to evaluate the blast ability of rockmass in an engineering and the result shows that the model is effective.     

APPLICATION OF DECOMPOSITION COORDINATION METHOD OF LARGE - SCALE SYSTEMS AND METHOD OF NONLINEAR PROGRAMMING TO ECONOMIC SCHEDULING OF POWER SYSTEM

In this paper,we discuss a mathematical mode) for optimization of active power dispatch of large-scale hydro-thermal power systems with cascaded hydropower stations. The following factors are taken into account: the variation of the head in the hydropower stations, water transport delay between cascaded stations etc. Using the decomposition-coordination method of large scale systems, we obtain a three-layer-hierarchical coordination system and a three-layer-hierarchical computational structure. We also discuss the computational methods which are used by each hierarchy. We have taken a test computation and analysing the result of an actual hydrothermal power system. The computational results show that it may obtain a satisfactory economic benefit. The paper provides some research work on the economic scheduling of hydrothermal power systems by the decomposition-coordination method of large-scale systems,multiplier method and a new variable metric method.     

A NEW CLASS OF AUGMENTED LAGRANIAN FUNCTION FOR NONLINEAR PROGRAMMING

In this paper, a new class of augmented Langrangian function for solving optimization problem with twice continuously differentiable inequality constraints is studied. Under mild assumptions on the parameters of augmented function, the equivalence of stationary points of the function and K-T points of the restricted problem is proved as well as their extreme points.     

Analysis of Global Stability of Soil Nailing Bracing Structures in Non-homogeneous Soil

Based on Swedish slices limited equilibrium method, a new computation formula of stability safety factor is presented for interior stability analysis of soil nailing wall in non-homogeneous soil. A new genetic algorithm is put forward by adopting dynamic self-adaptive technology and nonstandard genetic operators. Applying the dynamic self-adaptive technology and nonstandard genetic operators into the field of soil-nailing wall interior stability analysis, the dynamic adaptive genetic algorithm for searching the arbitrary critical slip surface is established. It is shown that the dynamic adaptive genetic algorithm has better performance in finding optimal solution, quicker convergence than traditional algorithm as well as more reasonable results.     

Hybrid distributed model predictive control using dynamic cooperation

For complex cooperative control problem of multi-agent systems, a distributed model predictive control scheme based on the dynamic cooperative rules is proposed. The collision avoidance constraint is transformed into hybrid rules based on the positions, and the Boolean function term was introduced in the cost function. In order to accommodate the complex time-varying environment, at each sample moment, the dynamic cooperative rules are designed according to the relative positions among the agents and the relative distances between the agents and the destination, so as to determine the weights in the Boolean function. This scheme reinforces consistencies of motion direction and control action, and improves stability and feasibility of distributed predictive control. As the control target can be achieved via a small prediction horizon, this scheme also enhances the real-time ability and practicality of distributed model predictive control. Simulation examples are given to illustrate the effectiveness of the proposed scheme.     

Intrusion Detection Technology in Ad Hoc Network

With the rapid development of wireless network and mobile computing,the security of network becomes more important.As one of wireless mobile network,mobile Ad hoc network has new vulnerabilities that do not exist in a fixed wired network,and is susceptible to attacks.This paper introduces some methods which used in intrusion detection system and provides a new model of system based on multi-layer integrated distributed technology,especially recommend the protocol analyzing method in this system.     

Temperature Control of High Temperature Melt Viscosity Test Instrument

The construction and function of high temperature melt viscosity test instrument are introduced in this paper. And the character of temperature control system is given. In order to improve dynamic and static performance of the temperature control system, a new method is proposed which combines threshold control with adaptive fuzzy PID control. While the current temperature of the heating furnace is much lower than the given temperature, threshold control works in order to protect system and improve dynamic performance. When the current temperature is close to the given value, adaptive fuzzy PID control works to improve static performance. At last, simulation and experiment results validate the proposed control method.     

FxLMS algorithm’s realization and verification by hardware in the loop simulation

Active vibration control uses an active anti-force from secondary path to suppress or attenuate vibration and noises. One of the wildly-used control algorithms is filtered-x least mean square(FxLMS) adaptive algorithm. Based on structure of FxLMS algorithm,Level-2 S function is used to build a new FxLMS blocks in Matlab/Simulink,which is applied to offline vibration active control system simulation. On the condition of convergence,performance analysis is carried out by adjusting interior parameters to test the control algorithm block. Finally,the custom FxLMS block is downloaded to dSPACE as controller,and used in hardware-in-the-loop simulation of active vibration control on a gear transmission system. Results verified the custom FxLMS block’s feasibility built by Level-2 S function and control algorithm’s efficiency.