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Water supply system has characteristics of non-linear, time-varying parameter, large time delay, so its mathematical model changes time by time. Water supply system widely use PID controller to keep constant pressure and PID controller need accurate mathematical model. The system that use PID controller is along with large overshoot, more adjusting time. Fuzzy controller don't need the accurate mathematical...
Many group activities can be represented as a complex network where entities (vertices) are connected in pairs by lines (edges). Uncovering a useful global structure of complex networks is important for understanding system behaviors and in providing global guidance for application designs. We briefly review existing network models, discuss several tools used in the traditional graph theory, distributed...
Multicast can jointly utilize the network resources when delivering the same content to a set of destinations; hence, it can effectively reduce the consumption of network resources more than individual unicast. The source of a multicast, however, does not need to be in a specific location as long as certain constraints are satisfied. This means the multicast can have uncertain sources, which could...
A robust approach to integrated guidance and control (IGC) involving a terminal angular constraint for hypersonic vehicles is proposed in this paper. A novel state-space model of a hypersonic vehicle that is suitable for bank-to-turn (BTT) technology is established by combining the line-of-sight (LOS) equations describing the relative motion between the vehicle and the target with the attitude motion...
In cloud computing, load balancing is a very important performance factor. Frequent addition and removal of Virtual Machines (VMs) can cause load imbalance across Host Machines (HMs). Therefore, redistribution of VMs to different HMs needs to be performed periodically. This is called VM load rebalancing (VMrB). Existing VMrB solutions consider either balancing across HMs (inter-HM) or balancing within...
Delay tolerant network (DTN) routing provides a communication primitive in intermittently disconnected networks, such as battlefield communications and human-contact networks. In these applications, the anonymity preserving mechanism, which hides the identities of communicating parties, plays an important role as a defense against cyber and physical attacks. While anonymous routing protocols for DTNs...
Power grids reliability and security are influenced by transient behaviors of various power system components. However, analyzing these transient behaviors needs to estimate millions of time-domain state variables with high computational efficiency. Most of the existing simulators are not based on parallel software platforms which have been proven to be powerful in many other applications. They are...
An Agent-based Computational Economics Model based on Classical Economics, the ACE-CE model for short, is established through a combined approach of the theoretical method and computational method. This model has successfully conducted several applications in China, which has proven the feasibility of mixed methods for large-scale computation in economics. It also verifies the theoretical rationality...
Thanks to the advent of clock synchronization via the global positioning system (GPS), phasor measurement units (PMUs) collecting both the magnitude and phase angle with higher precision have implications for monitoring performance across the wide area of smart grids. Owing to high PMUs installation costs, developing optimal strategy of PMUs placement is important to monitor the transmission system...
This article proposed a stochastic volatility model with T-distribution leveraged (ASV-T model), the model can be used to reflect the leverage effect and the fat-tail effect exist in stock market. Through the statistics analysis of the model, it is proved that the model is workable and is best for the fitting of historical data. With empirical research on Chinese GEM index, it is further proved that...
Placing appropriate numbers of PMUs is critical to collect phase angle data for best identifying multiple line outages in wide-area transmission system, because of high deployment costs. This work focuses on exploring the global optimal strategy of PMU deployment for maximizing the average identification capability of multiple line outages. Inspired by Kullback-Leibler (KL) distance, this paper proposes...
Due to intermittent connectivity and uncertain node mobility, opportunistic message forwarding algorithms have been widely adopted in delay tolerant networks (DTNs). While existing work proposes practical forwarding algorithms in terms of increasing the delivery rate and decreasing data overhead, little attention has been drawn to the control overhead induced by the algorithms. The control overhead...
Large-scale network of the renewable energy imposes increasing stringent requirements, especially with regard to harmonic distortion limits imposed by the grid code and the switching losses of the high-power PWM converter itself. This paper presents a new control strategy adopting the receding horizon policy, i. e., model predictive control (MPC), for a diode clamped three-level topology converter...
In online social networks (OSNs), it is an open challenge to select proper recommenders for predicting the trustworthiness of a target. In real life, people who are close and influential to us can usually make more proper and acceptable recommendations. Based on this observation, we present the idea of recommendation-aware trust evaluation (RATE). We further model the recommender selection problem...
In Opportunistic Mobile Networks (OppNets), data is opportunistically exchanged between nodes who encounter each other. In order to enable such data exchanges, nodes in the network have to probe their environment continually, so as to discover neighbor nodes. This can be an extremely energy-consuming process. If nodes probe very frequently, they will consume a lot of energy, and might be energy inefficient...
Nowadays, enterprises are more likely to encounter brand crises. Once brand crises happen, consumers tend to have a negative evaluation on the brand. Different types of brand crisis will lead to different damage to brand evaluation. Compared to passive brand crises, initiative brand crises will make consumers have much more negative evaluation on the brand. Consumer's self-image congruence will moderate...
Small and medium-sized enterprises (SMEs) are the most active component in our country's national economy, whose status, role and achievements have been universally recognized. However, technology innovation is a high-risk economic activity, whose innovation risk is also an important factor of affecting the sustainable development of SMEs. How to respond to the influence of technology innovation risk...
Localization is an important design issue in wireless sensor networks. In this paper, we will focus on the sensor deployment for localization with the consideration of coverage and accuracy. Our pairwise localization pattern requires the information of only two coverages for the target. With this information, there are two possibilities of the position. In order to determine the correct location,...
Delay tolerant networks (DTNs) are a kind of wireless mobile network which may lack continuous network connectivity. Multicast supports the distribution of data to a group of users, a service needed for many potential DTNs applications. While multicasting in the Internet and mobile ad hoc networks has been studied extensively, due to the unique characteristic of frequent partitioning in DTNs, multicasting...
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