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Driven by the energy situation, technological innovation and information technology, the new energy will be substantially connected to the grid; power electronic technology will be widely used in the manufacture of the electric power equipment; electricity networks are highly integrated with the information communication network. The development of grid pattern has put forward a series of challenges...
With the promotion of tube tower in transmission line, to improve processing efficiency and quality, the substitute of butt welded forged flanges for traditional flange is become the trend of future development. With solid elements and contact elements of the general-purpose finite element software ANSYS, this paper analyzes the mechanical characteristics of forged flanges with neck, summarizes characteristics...
802.11i is the latest security protocol of WLAN, providing confidentiality, integrity and mutual authentication schemes. The paper analyzed the 4-way handshake mechanism of 802.11i protocol, and pointed out the weakness of 4-way handshake protocol flaws and possible attacks. Two improved mechanisms are proposed: 1. ANonce encryption, the transmission of plaintext of ANonce in the method is avoided...
The steel tower applying large size angel steel which limb width exceeds 200mm is characterized with good integrity of material, clear force transmission, simple node structure, saving bolts and filling plate, convenient assembly and erection etc advantages. Technical and economic advantage of Q420 large size angle steel tower has been validated in ±800kv ultra-high DC Jinping-Sunan power transmission...
Threshold segmentation is the fastest method of defect detection in the modern defect inspection system based on computer vision. But in the real paper defect detection system, the segmentation thresholds usually change with the paper image luminance which is influenced by many factors. In order to resolve this problem, an adaptive threshold segmentation method based on BP neural network is proposed...
We investigate a class of quasi-linear multi-point boundary value problem with one-dimensional p-Laplacian. By applying monotone iterative technique, some sufficient conditions for the existence of twin positive solutions are established, they are the maximal and minimal solutions of the above problem. At the same time, we also establish iterative schemes for approximating this twin solutions, which...
In this paper, the analysis model which suites to Cognitive Radio (CR) communication together with amplify-and-forward cooperative communication systems where cognitive users can act as cooperative diversity relays to the licensed users based on average Channel State Information (CSI) is presented. Firstly, the model of the cooperative and cognitive radio system is given. Then, the transmitting protocols...
In this paper, the Symbol Error Rate (SER) performance formulation which suited to multi-node amplify-and-forward cooperative communication M-PSK constellation systems with the mean channel gains is derived. Firstly, the closed-form theory symbol error rate formulation with M-PSK modulation is derived. Then, a Low Bound (LB) is established to show the asymptotic performance of the cooperation protocol...
XML has broken through the restriction of HTML fixed tag set, and been the open criterion of the data description in the Internet and data exchange in the application system. This article focuses on the application analysis to the construction and performance of B/S system as well as the comparative study of XML technology applied into the B/S system to get a series of advantages of B/S system based...
It's the first used in 1000kV Transmission Line in China. To verify the validity of optimize, calculate and select material in UHV AC test and pilot project tower, choose several typical towers to conduct test and research. This article Through analyze the test data, it provides optimize proposal, reference for UHV tower design.
How to decrease the volume in DNA computers has become an important problem in the research of DNA computing. And the poor scalability in the DNA-based algorithms roots in the poor scalability of the DNA models. In this paper, we modified Chang's model by add biological operations the operations of fluorescence labeling and gel electrophoresis into Adleman-Lipton model and change the structure of...
In the HRL field, there are several main methods such as HAMs, options, MAXQ. These methods all rely on the theory of SMDPs. However, SMDPs does not specify how the overall task can be decomposed into a collection of subtasks. This paper introduces the concept of ldquopolicy-coupledrdquo SMDPs into HAMs. It defines the concept of HAM-decomposable and makes the relations among the HAM machine, HAM-decomposable,...
Hierarchical finite state machine (HFSM) has proven to be a powerful tool for controlling non-player characters (NPCs) in computer games due to its flexibility and modularity. For most implementations, however, it is often the case that the control details at all levels are hand-coded. As a result, the development process is often time intensive and error prone. In this paper, we explore the use of...
In the HRL field, there are several main methods such as HAMs, options, MAXQ. A main problem that exists in HAMs is its joint state space consisting of the cross-product of the machine states in the HAM and the states in the original MDP, which can not be completely solved by a subroutine-based state abstraction method. This paper analyzes this problem in detail, provides formal definitions of homomorphism...
The lateral vibration of the high-speed rotation slice-disk is controlled using the hydrodynamic film and the control of the disk was studied by the finite element method and the experimental measurement. The slice-disk was meshed by elements of the fan-shaped grid. A dynamic equation of the rotation disk was established by the Lagrange equation and the theory of the hydrodynamic lubrication. The...
In order to guarantee the QoS for multimedia data transmission over wireless ad hoc network, the data flow entering the node was regulated by leaky bucket, and the node provided rate-latency service for the flow. We had derived the end-to-end upper jitter bound for wireless ad hoc network based on the existing link throughput model using network calculus theory, for grid network topologies, all simulated...
Recently, variants of hybrid PSO algorithms are presented, but hybrid Optimization technique combining classical local line search with PSO is less focused on. In this paper, we proposed a new hybrid cooperative evolutionary algorithm by integrating local line search technique and basic PSO. The performance of our algorithm tested using four typical nonlinear optimization problems is reported and...
In the HRL (hierarchical reinforcement learning) field, there are three main methods such as HAMs (hierarchical abstract machines), options, MAXQ. These methods all rely on the theory of SMDPs. While the SMDP framework allows us to directly model the high-level actions that take varying amounts of time, it provides little in the way of concrete representational guidance, which is critical from a computational...
In this paper, we analyze the symbol-error-rate (SER) performance for a two-user amplify-and-forward cooperative system. By making use of M-PSK modulation, the closed-form SER formulation and corresponding upper bound are derived first. According to the SER performance analysis, the impact of relay location is discussed by making use of a simple line topology. If the power allocation to the source...
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