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The minimum Steiner tree theory is the basis theory of global shortest path. It is one of the classic NP-hard problems in nonlinear combinatorial optimization. A visualization experiment approach has been used to find Steiner points and the system shortest path named Steiner minimum tree. However, the obstacles must be taken into consideration in some problems. An obstacle-avoiding Steiner minimal...
Machine learning requires sufficient and reliable data to enhance the prediction performance. However, environmental data sometimes is short and/or contains missing data. Often existing prediction models built on machine learning fail to predict environmental problems accurately. We argue that spatial domain data can be used to facilitate the training of temporal prediction model. This paper formulates...
In order to overcome the problems existing in Kalman filter(KF), extended Kalman filter(EKF) and unscented Kalman filter(UKF) in the vehicle integrated navigation system, a method is adopted to solve this problem. UKF algorithm is introduced, and an improved UKF was presented which is an adapted factor is introduced in UKF. It is shown, in vehicle integrated navigation system, UKF is superior to the...
Power plant control of the embedded data acquisition system had been developed from centralized control, distributed control into fieldbus control. The paper puts forward a design program combining Modbus communication protocol with 32-bit ARM Coretx-M0 microprocessor as its core. The overall design scheme of the system and the content of Modbus Communication Protocol are introduced while the circuit...
Ranging by Time of Arrival (TOA) of Narrowband ultrasound (NBU) has been widely used by many locating systems for its characteristics of low cost and high accuracy. However, because it is hard to support code division multiple access in narrowband signal, to track multiple targets, existing NBU-based locating systems generally need to assign exclusive time slot to each target to avoid the signal conflicts...
H-type vertical axis wind turbine (VAWT), with higher wind energy utilization, is one of the most common forms of Darrieus-type vertical axis wind turbine. A simplified mathematical modeling analysis is proposed to obtain the performance of H-type VAWT in this research. Blade element momentum theory is used to calculation the power and efficiency of H-type VAWT, and computational fluid dynamics (CFD)...
Wind energy is increasingly attracting the world's attention because of it is a renewable energy cleanly and inexhaustibly. How to improve the stability and efficiency of the wind power conversion system is particularly important. A maximum power point tracking algorithm is proposed based on the experiment data: the open-jet & return-flow wind tunnel is used to simulate the natural wind and the...
Indoor localization using Time-of-Arrival (TOA) of ultrasound is accurate, but remarkable errors may occur occasionally due to effects by indoor environment issues, such as when ultrasound propagates in Non-Line-Of-Sight (NLOS) paths, or synchronization signal is interfered by background signals. This paper presents an algorithmic and systematic approach to address these issues to improve robustness...
Wind energy is a renewable energy without pollution in the nature world. Researchers dedicate to improve wind energy utilization of vertical axis wind turbine (VAWT). A new type of wind rotor named fish-ridged rotor is proposed based on bionic simulation of swimming fish. Geometric structure of the rotor is designed and analyzed. Wind tunnel tests are carried out to study performance of the rotor...
The wind permanent-magnet generator experimental platform will be developed which drives directly through three phase asynchronous motor. The system hardware is mainly composed of the three phase power supply unit, the inverter, three phase asynchronous motor, External rotor permanent generator, three phase resistive load, the torque and rotational speed sensor, data collector with the USB interface,...
Wind tunnel test is one of the important methods to research the characteristics of vertical axis wind turbine (VAWT). To improve the test performance, intelligent test equipment for VAWTs is developed. The whole equipment is divided into three subsystem: support and adjustment, intelligent data-acquisition and analysis and loading system, each of them is analyzed and designed. An intelligent test...
Abstraction refinement techniques in probabilistic model checking are prominent approaches to the verification of very large or infinite-state probabilistic concurrent systems. At the core of the refinement step lies the implicit or explicit analysis of a counterexample. This paper proposes an abstraction refinement approach for the probabilistic computation tree logic (PCTL), which is based on incrementally...
This paper proposes a novel incremental learning based image change detection method capable of detecting changes over image series. Given two images for change detection, an intelligent agent is trained by incremental learning on the source image. As detecting changes to target image, the agent conducts “one-step more” incremental learning on the target image to find its difference against what has...
Composite Insulators exposed to atmospheric environment with pollution and ultraviolet rays for long-term would become aging. Hydrophobic was an important parameter of the composite insulator characteristics. Under the impetus of the STRI laboratory, the static contact angle evaluation method had been changed by receding angle evaluation method internationally. China could not be directly used, the...
In this paper, we present an efficient authenticating mechanism for supporting full interactive functions of video streaming. The server stores multiple versions of the same video for different playback speed. Our mechanism uses a tree-based structure to amortize frame level signature, merges multiple authenticating paths into this structure according to the frame chosen result of the video's different...
With the development of automobile industry, the number of private cars is increasing more rapidly than ever. In developing countries such as China, the crowded traffic which is caused by large quantities of private cars has brought very serious and bad effect to the development of some cities. Under this circumstance, people realize that the best way to solve the crowded traffic problem is to construct...
Monitoring the energy consumptions of the massive electrical appliances in buildings has attracted great attentions for smart, green and sustainable living. Traditional approaches generally require large-scale smart sensor/meter networks, and thus suffer from the high deployment, maintenance and data collection costs. In this paper, we propose methodologies and algorithms to optimize the smart meter...
The cross roller guide way used in high-acceleration and high-precision motion platform of chip packaging equipment has an important effect on the dynamic performance of the platform. In this paper, the cross roller guide way is simplified to a five degree-of-freedom system and the theoretical model is built according to its working conditions. An experimental system is established and the stiffness...
This paper presents a novel tracking laser Doppler velocimeter that can achieve precision measurement of the target's velocity along the optical axis. To meet the needs, we designed a feedback control system and the Pseudo-Random Sample Consensus algorithm, which are able to ensure the rapid identification and automatic tracking of the target. In addition, employing the retroreflective sheeting makes...
Abstract-A new selective transmission mode in a three-node relay system is proposed when interference cancellation (IC) is not applicable on receivers. According to the effective Signal-to-Noise-Ratio (SNR) of each link, the source determines whether to transmit new information in the second slot while the relay node is forwarding the information received during the first slot. By the proposed monitoring...
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