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Circuit breakers are important equipment to control the energy distribution and fault isolation in power grid. With the development of the power grid in China, the evaluation of health status of circuit breaker in operation becomes an important part of the operation management. A number of studies have been made on the evaluation of circuit breaker health status, but are mostly limited to interpretation...
Due to its lots of advantages, CT20 type spring operating mechanism is widely used in the 126kV high voltage circuit breaker. This type mechanism should not meet the requirement of higher interrupting capacity circuit breaker while the interrupting capacity is increasing. In this situation, sometimes the vibration of the closing latch during closing may cause the closing process failed if there is...
In the field of advance scientific research where world is moving towards less human resources and more machine. Distributed representation has been one of the major field in which the prospects of neural usage have shifted immensely. In this research paper we have discussed how distributed representations are being used in streaming data clustering, and how to build a sequential evolution model for...
Wind power short-term power prediction is an important index to evaluate the level of wind power operation, and it is also an important parameter to guide the safe operation of power system. Considering the singleness one-sidedness of the existing evaluation index, this paper aims to construct a comprehensive evaluation index system for regional wind power forecasting. The traditional single evaluation...
In this paper, we compare the statistical properties of high-speed train (HST) wireless channels in different scenarios using a generic non-stationary HST channel model that has been verified by channel measurements [1]. We mainly focus our comparison and analysis on the three most common HST scenarios, i.e., the rural area, cutting, and viaduct scenarios. Several channel statistical properties such...
Structured machine learning refers to learning a structured hypothesis from data with rich internal structure. We apply semantics-enabled (semi-)supervised learning for perfect and imperfect domain knowledge to fulfill the vision of structured machine learning for big data analytics and modeling. First, domain knowledge is modeled as RDF(S) ontologies, and SPARQL enables approximate queries for a...
Active deception jamming Scenario generation technique to SAR plays an important role in the development of SAR system and the evaluation of anti-jamming ability. Research on active deception jamming scenario generation technique to SAR is simple now. SAR jamming scenario echo simulation is studied aimed at the problem, through analyzing the basic principle of SAR and deducing the mathematic model...
Travel activities have been widely applied to quantify spatial interactions between places, regions, and nations. In this paper, we model the spatial connectivities between 652 Traffic Analysis Zones (TAZs) in Beijing by a taxi OD dataset. First, we unveil the gravitational structure of intra-urban spatial connectivities of Beijing. Overall, the inter-TAZ interactions are well governed by the Gravity...
When grounding fault occurs in power transmission line in neutral-point grounded system, fault current of the fault phase tends to increase dramatically. In the meantime, the amplitude and phase of the current of non-fault phase also changes abruptly in some degree due to mutual inductance between phases. Firstly, by building model with complete electrical parameters based on induction between phases,...
As the microblogging service (such as Weibo) is becoming popular, spam becomes a serious problem of affecting the credibility and readability of Online Social Networks. Most existing studies took use of a set of features to identify spam, but without the consideration of the overlap and dependency among different features. In this study, we investigate the problem of spam detection by analyzing real...
With the fast development of the e-commercial and content management web application in web 2.0 communities, more and more web communities support users in making comment about the objects they have reviewed. Comments do assist users to learn about the items they are reviewing. However, there are always hundreds of comments about an item, and to review them one by one is a time consuming job. Since...
Multi-layer lithography machine is one of the crucial equipments in the semiconductor integrated circuit industry. Recently, more and more research interests have been attracted to develop higher precision lithography machine. The error analysis plays an important role in the development of ultra-precision lithography machine. In this paper, the error analysis of six degrees of freedom micro-displacement...
Design of complex system often involves a multitude of decision variables and parameters. In order to relieve the computational burden, manage the complexity in design processes, and achieve concurrent analysis and design, a complex system can oftentimes be decomposed into several subsystems with hierarchical relation according to their functional attributes, physical structures, or scale magnitudes...
Dynamic fault tree analysis method can be used to model and analyze reliability of complex engineering systems with dynamic failure characteristics. By incorporating the Bayesian Networks into dynamic fault tree method can alleviate the state space explosion problem involving in the latter. Based on Bayesian networks, a novel dynamic fault tree analysis method under fuzzy numbers is presented in this...
Failure rate is a commonly used reliability measure for engineering systems. Accurately describing failure rate of a system often plays a crucial role in maintainability analysis and modeling. The failure dependency among components will accelerate the failure process of entire system. This paper proposes a new failure rate model with considering the failure interaction between components. Examples...
According to the disturbance, complexity and derivative of unconventional emergencies, studying the evolution rules in order to monitor the complexity and development trend of event processing has become one of the hot research issues. This paper proposed a trend monitoring model and formal description for unconventional emergencies based the NFA, and designed the events evolutionary algorithm. The...
Possibilistic reliability theory is the study of reliability based on the principles of possibility theory. In this paper, the possibilistic reliability function of multi-state system is redefined and analyzed utilizing the possibility distribution of system lifetime. In order to express the internal relationship between system state and residual lifetime, state corresponding most possible residual...
This paper proposes a new simulation model for emergency evacuation of civil aircrafts taking into account of influences from passengers' physical attributes. The new model uses the staggered mesh discretization method to generate evacuation map and the intelligent agent-based model to simulate evacuation process. With the proposed model, artificial passengers are able to enter the same cell if they...
The model and dynamics of a kind of buoyancy-ballast driven airship are studied. Based on Kirchhoff equations and Newton-Euler laws, we developed the six degree of freedom nonlinear dynamic model for an airship equipped with independent ballonets and ballast by analysis its movement and stress. On the condition of little perturbation, the nonlinear dynamic model is divided into three group equations...
The canoe is an event that athletes use a paddle on one side of the boat to row, by harmonizing muscle groups in upper- and lower-limbs and trunk, so research on the cooperation among human, oars and boat is most important to improve athlete's technology and performance. In this paper, we measured 7 kinematic parameters, such as force and angles (pitching and upset) of oar, speed and angles (pitching...
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