17669846
Research on the Robustness of a Proportional Integral Switching Surface Based on Sliding Mode Control
In this paper, a novel proportional-integral (PI) switching surface is introduced for determining the synchronization performance of systems in the sliding mode motion. Based on the sliding mode controller, the system is established by a robust control scheme which guarantees the occurrence of a sliding motion of error states even when the parameter uncertainty and external disturbance are present. So this paper researches on robust synchronization problem by investigating a highly complex dynamic nonlinear system—chaotic systems. Some simulation results on controlling different chaotic systems are made and investigated in order to demonstrate the good performance of the method and this control design process is much easier to be completed.
44448884
Products of Mealy-type fuzzy finite state machines
We introduce seven ways of constructing products for Mealy-type fuzzy finite state machines as well as the concept of covering. The properties of transition functions and output functions are discussed. Furthermore, we investigate the covering properties and mutual relationship with regard to these products. We also prove that the covering relationship holds in the product of factor machines.
3009217
Design and Implementation of an Out-of-Band Virtualization System on Solaris 10
In out-of-band virtualization systems, it is typical that the virtual storage manager (VSM) maintains the metadata for all Agents and performs the address mapping. The Agent performs I/O access according to the mapped address. High network latency, poor performance and low scalability are the main problems of this method. This article introduces an improved design and implementation of an out-of-band virtualization system, in which each Agent maintains a copy of the metadata and performs the address mapping by itself, so as to improve performance, reliability and scalability. This article discusses the on-line extension of a logical volume and the related problems such as synchronization. This function improves the ability of uninterrupted service. The system was tested on the UFS of Solaris 10 and the results showed that the performance of a stripe volume consisting of four disks exceeded that of a linear volume by an average of 103.65%.
41505059
Distributed Computation in Local Area Networks of Workstations
This paper describes the performance analysis of the local area network (LAN) of workstations for distributed computing applications. Several application programs represented in a task graph format are scheduled by the user workstation (master) for parallel execution in the idle or lightly loaded processors (slaves) in LAN. The partial results are collected by the master station to synchronize the operation of slave nodes. The system performance is characterized by the network speedup considering scheduling time, network load and size, communication time, TCP/IP communication overhead, task execution, and synchronization time. The sequential and parallel execution times and the performance degradation factors were measured during the implementation for various network loads. The measurement values and theoretical results have shown that the system performance is degraded mostly by the TCP/IP overhead (0.2 s), the network size, and the network load.
6062507
On Data Fusion and Lifetime Constraints in Wireless Sensor Networks
The problems of energy efficient sensor network configuration and local fusion of sensed data have been addressed separately in the previous works. In this paper, we propose to analyze the sensing accuracy with the consideration of the node distribution and fusion overhead in terms of the energy consumption. By extending existing sensing model in the literature, we quantify how the sensing ranges and node densities of sensor nodes impact the sensing accuracy, and how it affects the fusion overhead and the sensing lifetime of the network. We identify the tradeoff between sensing accuracy and energy consumption in an analytical framework. It can be used to choose optimal parameters of sensor networks to meet the specified sensing or lifetime requirements.
7939166
Evaluation methodology for the security of e-finance systems
E-finance refers to financial systems using the emerging Internet and e-commerce systems. Thanks to the worldwide interest in Web-based e-services, we find Web-services being ushered into financial markets that are sensitive to security concerns. This research was carried out to investigate the effectiveness of emerging security features of Web services in the context of financial markets. In the process we have developed a new evaluation framework (SEFAN) for the security of e-finance systems. This paper presents SEFAN model and its evaluation based on contextual interview of experts.
19667746
Study on the Harmonious Operation of Logistics Finance Management of Supply Chain in Ports-Hinterland Based on System Dynamics
Abstract-Taking China's ports-hinterland logistics system as an example, the paper discusses the harmonious operation of logistics finance management of supply chain which is composed of the functional entity activities such as transportation, warehousing, packaging, circulation and information transmission, as well as the goods movement of all sectors of the logistics process. The logistics finance management is complex operating system with dynamics features, which is established on the basis of a "virtual organization" made up by nodes in supply chain. In order to provide a new research perspective on the coordination development of ports-hinterland logistics system, a dynamics model of logistics finance management of supply chain was set up based on the theory of system dynamics.