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We introduce an opportunistic interference alignment (OIA) scheme for multiple cellular networks with multiple-input multiple-output interference multiple access channels (MIMO-IMAC). This OIA scheme does not need the global channel state information (CSI). It corresponds to an uplink scenario in a cellular network with multiple base stations consisting of M receive antennas per basestation, and multiple...
Emergency food transportation is an important part of emergency food logistics. How to deal with various difficulties and to transport required quantity and quality emergency food to the demand point in time during natural disaster is worth studying deeply. This paper, with reasonable assumptions about transportation problem, proposed an optimization model of emergency food transportation plan during...
Name ambiguity has long been viewed as a challenging problem in many applications, such as scientific literature management, people search, and social network analysis. When we search a person name in these systems, many documents (e.g., papers, web pages) containing that person's name may be returned. It is hard to determine which documents are about the person we care about. Although much research...
In many social networks, there exist two types of users that exhibit different influence and different behavior. For instance, statistics have shown that less than 1% of the Twitter users (e.g. entertainers, politicians, writers) produce 50% of its content, while the others (e.g. fans, followers, readers) have much less influence and completely different social behavior. In this paper, we define and...
Barrier coverage is an important problem for sensor networks to fulfill some given sensing tasks. Barrier coverage guarantees the detection of events happened crossing a barrier of sensors. In majority study of barrier coverage using sensor networks, sensors are assumed to have an isotropic sensing model. However, in many applications such as monitoring an area using video camera, the sensors have...
In this paper, we focus on designing efficient query of top-k data produced by sensor nodes in a wireless sensor network (WSN). Assume that we are given a connected WSN of diameter D, consisting of n nodes with maximum node degree Δ. Two different models are studied. In the first model, each node holds a numeric element, the goal is to determine the top-k smallest (or biggest) of these elements from...
We present a 10 channel, polarization-multiplexed QPSK receiver photonic integrated circuit, with 25 GHz channel spacing, operating at 28 Gbaud (112 Gbit/s per channel). With 10 channels operating, this is a Terabit Superchannel receiver.
Because of High-Pressure Swing Spraying Grouting Engineering Test needs more parameters to define, and the tests of construction unit are simple and bold, the engineering cost is very high. Through analyzing the internal relations between different parameters and comparing their importance by the introduction of the hydraulic formulas based on the South-to-North Water Transfer Project, this paper...
The control methods and operation characteristics of D-STATCOM under unbalanced grid voltage are studied in this paper. Through methods of switching function and sequence network, the effects on voltage output of D-STATCOM caused by grid voltage unbalance and its over current are analyzed. The performance of voltage output of D-STATCOM is improved with modified modulation method of switching function...
To improve the voltage quality of the power supply is an important function of the D-STATCOM. A novel voltage control strategy based on active-disturbance rejection control under unbalance voltage conditions is proposed in this paper. The active-disturbance rejection control for D-STATCOM is proposed to overcome the difficulty result from the nonlinear, multivariable and coupling characteristics of...
This paper tries to find the relationship between value congruence and employees' coping. It explores the structure of employees' coping strategy and classifies coping into confronting coping, planning, behavioral disengagement, and wishful thinking, with two dimensions of positive-negative and behavior- cognition. This paper tests relations among four sub-dimensions of value congruence and coping...
Distribution static synchronous compensator can bu used to improve the voltage quaLity through exchanging the reactive power between the D-STATCOM and the power system. Keep the voltage of the point of common coulpLing constant and balance is a very important power quaLity issues. The voltage controll strategy which has the function of voltage compensation and balance of the D-STATCOM is investigated...
Nonnegative matrix factorization method is a kind of new matrix decomposition method. It is an effective tool for large data processing and analysis. At the same time, NMF has an important performance on intelligent information processing and pattern recognition. This paper first analyses and discusses the NMF algorithms based on its basic theory. We then propose new methods of data clustering and...
Social influence, the phenomenon that the actions of a user can induce her/his friends to behave in a similar way, plays a key role in many (online) social systems. For example, a company wants to market a new product through the effect of ``word of mouth'' in the social network. It wishes to find and convince a small number of influential users to adopt the product, and the goal is to trigger a large...
A real-time monitor and rescue system must be able to both quickly and reliably detect the event happening in its monitoring region. Furthermore, it is required to fulfill certain rescue mission, e.g., navigate victims to exit through safe path in case of emergency. Current monitor and rescue approaches generally rely on either teleoperated robots, or teams of wireless robots. Typically the robots...
This paper mainly describes a method based on structured singular value (μ) for analyzing the robustness of unmanned helicopter flight control system. The helicopter is a complex controlled system with static instability, non-linearity, multi-variables and strong coupling. In this paper, based on the introduction of basic theory of LFT and μ-analysis, the X-Unmanned Helicopter(X-UMH) is chosen as...
A multiple optimization algorithm, the Cultural Algorithm based on Particle Swarm Optimization (CAPSO) was applied to flight control law clearance. The algorithm provides a more accurate performance in function optimization when compared with the traditional Particle Swarm Optimization (PSO). A short-period of longitudinal flight control system for a certain aircraft was designed before the validation...
Recent advances in the modeling of deformable one-dimensional objects (DOOs) such as surgical suture, rope, and hair show significant promise for improving the simulation, perception, and manipulation of such objects. An important application of these tasks lies in the area of medical robotics, where robotic surgical assistants have the potential to greatly reduce surgeon fatigue and human error by...
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