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Recently, some researchers attempt to find a relationship between the evolution of rare events and temporal-spatial patterns of social media activities. Their studies verify that the relationship exists in both time and spatial domains. However, few of them can accurately deduce a time point when social media activities are highly affected by a rare event. Thus, it is difficult to characterize an...
Previous research on dimensionality reduction has shown that global and local information is both important for capturing the crucial features of data sets. In this paper, we develop a new approach that can effectively retain both global and local features of a dataset for supervised dimensionality reduction. A new quadratic measure is developed to accurately describe the local features of a dataset...
Agricultural modernization is not only an expressive form of modernization, but also a symbol of social civilization. Based on previous studies, this study established index system and comprehensively evaluated Chinese agricultural modernization from 2008 to 2013. In order to evaluate accurately Chinese agricultural modernization, we studied from three aspects: agricultural production efficiency,...
Dimensionality reduction is a problem of fundamental importance in both machine learning and data mining. In this paper, we develop a new approach that can process labeled datasets and accurately reduce their dimensionalities. The approach is based on a new objective that contains information from both the global and local structures of a data set. An iterative approach is used to compute the directions...
This work designs an emergency traffic light strategy at signalized traffic intersections in order to prevent traffic congestion. Some additional warning lights are used. The emergency strategy is realized by the cooperation of traffic lights and warning lights. It contains a ban signal strategy, and a warning signal strategy. A two-way rectangular grid network is modeled via the cell transmission...
When the multi-fault occured in distribution systems, the scheduling scheme of repair's resource plays an important role in the rush repairs and restoration of power supply. However, it is difficult to set a reliable restoration scheme quickly only by experience of dispatchers, because the multi-fault restoration involves many factors. Therefore, this paper discusses how to make a scientific and reasonable...
Petri nets (PNs) are well utilized as a visual and mathematical formalism in modeling, analysis and control of urban traffic. This work adopts timed Petri nets to design a traffic-signal-based emergency control policy such that emergency response is provided and the incident-induced large-scale congestion is prevented. A reachability graph method is adopted to demonstrate how the models are used to...
Petri nets (PNs) are well utilized as a visual and mathematical formalism to model discrete event systems. Some extensions to PNs enhance their modeling capability. This work uses Time Petri nets (TPNs) and Synchronized Petri nets (SPNs) to design a traffic control system (ITCS) for intersections dealing with accidents such that emergency response is provided and additional accidents are prevented...
Scientists' engagement in public outreach plays a crucial role in the advancement of science for public at large. China has issued a number of policies to encourage scientists to participate in communicating science with general public. Currently, national leaders are calling for scientists to get more involved in public outreach in the process of their scientific research. To communicate the latest...
a compact high sensitivity micro-displacement sensor based on a long-period fiber grating (LPG) with an air-cavity is proposed and experimentally demonstrated. The sensor head is obtained by composing an air-cavity with a LPG and a single mode fiber (SMF). The shift of the wavelength of the LPG is depended on the length of the air gap. The experimental results show that the sensitivity 0.2155nm/μm...
A logical net unit (LNU) model is defined according to logical Petri nets (LPNs). The Web service composition takes a service cluster as a minimal granularity for the first time, and a service cluster is formally modeled by an LNU in a virtual layer. The composition of service cluster model LNUs generates Service Nets and the basic composite patterns of LNU models are discussed. And the Service Nets...
Scientists have incomparable professional advantages in science communication and have the obligation to inform public about what they are doing and what affect their research has to the society. This article in the first place introduced the main forms that scientists communicate with public in China and the extent of their participation. The policy background was also discussed in the first part...
This paper presents a novel second order sliding mode observer to estimate the rotor position and speed in the sensorless control for PMSM. The second order sliding mode control law is achieved by a Lyapunov function approach and the algorithm is easily to be realized. Compared to the conventional sliding mode observer, the novel method can successfully eliminate the system chattering problem omitting...
Odor source localization is very important in real-world applications. We studied the problem of odor source localization and presented a modified particle swarm optimization algorithm for odor source localization of multi-robot. The algorithm dynamically adjusts two learning factors in the velocity update equation based on the effect of wind on self-cognition and social cognition of a particle. In...
Biodiesel has been gaining increased attention as a nontoxic, biodegradable and renewable new green alternative diesel fuel. Production of biodiesel can be synthesized by chemical or by lipase methods, while lipase method has more advantages compared to chemical synthetic method. In this article, the microbial strains with activity of lipase were isolated from long time oil-contaminated soil and strain...
The magnetic surface acoustic wave (MSAW) devices developed in recent years are a class of tunable surface acoustic wave devices (such as filters, tuners, oscillators, etc.) which are important parts of radar, sonar, TV, computers and other modern communication systems. Giant magnetostrictive thin films (RGMFs) have high energy, large magnetic response, and high elastic modulus as well as the function...
Rare earth giant magnetostrictive thin films (RGMFs) belong to a new type of electro (magnetic) - mechanical conversion functional materials. Such materials have broad application prospects in magnetic surface acoustic wave (MSAW) devices. In this paper, RGMFs samples are fabricated by ion beam sputtering deposition (IBSD). In order to improve the magnetic sensitivity, films after forming are heat-treated...
With the promotion of people's demand on information security, access authentication gets more and more attention nowadays. However, most of the traditional access authentication schemes, such as 802.1X, Web authentication, etc., have a great deal of limitations and disadvantages in security and mobility. They can't meet increasing challenges especially from wireless authentication. In this paper,...
To help further processing the data from Chang'E-1 lunar orbiter (CE-1), an initial comparison is made between simulated brightness temperature (TB) of lunar surface and TB observed by microwave radiometer on CE-1. First, a simulation model is presented and simulated TB is given for global moon. Then, global observed TB map is established based on the observed TB from CE-1. Further, the difference...
Multihoming and mobility can provide more stability and convenience in the future network, but they still bring new challenges such as addresses change in mid-session. This paper introduces a new application context which integrates NAT66 and GSE with multihoming. Then we implement HIP to solve this challenge. In this paper, we specialize in the implementation of HIP on solving mobile IP and addresses...
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