The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a guidance law design for synchronized path following of multiple underactuated unmanned surface vehicles (USVs) without using a global reference velocity. Firstly, a distributed observer is proposed to eliminate the need of reference velocity known to all the vehicles. Secondly, a line-of-sight based guidance law is derived to force each vehicle to follow a parameterized path...
This paper presents a fully distributed fiber acoustic sensing (DAS) system. Combined with the phase-sensitive optical time domain reflectrometry (Φ-OTDR) technology and phase generated carrier (PGC) demodulation technology, the system can detect and acquire seismic wave signal in real time. The system has a 3.05dB flatness of frequency response from 5Hz to 1kHz, which with sampling interval of each...
The application of microfluidic technology to manipulate cells or biological particles is becoming one of the rapidly growing areas in recent years. In this paper, we design three categories chip with different microstructure, including seamless, single-slit and double-slit U-type micro-trap, to evaluate the optimal structure and parameter of cell-trap microfluidic chip. Velocity control and optimization...
Maximum power point tracking (MPPT) is mandatory for improving the power-conversion efficiency of photovoltaic (PV) systems. Although classical MPPT techniques are widely used by virtue of their simplicity and ease of implementation, the tracking performance is degraded compared with artificial-intelligence based techniques under rapidly changing environmental conditions. This paper proposes an on-line...
Alignment-free sequence comparison methods can compute the similarity between a large number of sequences much faster than methods that depend on sequence alignment. We propose a new alignment-free sequence comparison method, called K2, based on the non-parametric Kendall statistic. Compared with the state-of-the-art alignment-free comparison methods (e.g., D2, D2*, D2sh, and Chisquare(χ2) statistic),...
In this paper, a visual tracking algorithm based on adaptive background modeling and improved particle filter was proposed, which can be effectively used to track the players in sports video. Adaptive background modeling was used to extract motion information in the dynamic scene, and obtained precise motion region through a designed target selection filter, then, do the tracking algorithm under particle...
In this paper, we propose a novel two-way coherent TM01 mode combiner that combines the two-way TM01 mode to a one-way TM01 mode with high power capacity and combining efficiency. It is mainly composed of two two-way TM01 mode to TE10 mode power dividers, one four-way TE10 mode to TM01 mode power combiner and four H-plane bend rectangular waveguides. Simulation shows that, at center frequency 9.3...
High range resolution profile (HRRP) contains important target structure signatures and is easy to be acquired, which makes HRRP target recognition keep drawing great attention from the radar target recognition community. Firstly, data are preprocessed and the features are weighted with their sensitive-values. Then, using feature extraction method based on manifold learning to reduce the feature dimensions...
In this paper we consider a decentralized maintenance policy for a multi-state system (MSS) consisting of heterogeneous components under a POMDP framework. Components in MSS are classified into low priority components (LPCs) and high priority components (HPCs). Different components may have different deteriorated performances at the same time, and hence the behavior of the system needs to be modeled...
Objective: To observe the nutritional support effects of calorie for senile chronic diseases. Methods: The 72 selected senile patients were divided into 2 groups, or the calorie restriction group and the non-calorie restriction group. Nutritional support was given by nasal feeding. The change of the nutritive index and the incidences of complications were observed in the 2 groups. Results: Hematochrome,...
In order to shorten test time and realize rapid evaluation of the reliability of high reliability and long lifetime competing risk products, based on the rules of optimum design plan of double stresses accelerate life test, this paper presents a method of simulation based on optimal designs for double stresses accelerated life test with competing risks (CRDS-ALT) and presents a procedure of the test...
With the development of desktop virtualization technology, more and more companies begins to deploy virtual desktop. Traditional NAS and SAN storages can only support small-scale users due to network bandwidth limit and poor scalability. Another disadvantage is that NAS and SAN storages are very expensive. The distributed file systems such as GFS, PVFS, and Lustre are with low cost, high scalability...
This study will investigate whether current economic activities in china have explanatory power over stock returns, or not. Monthly data of Shanghai Securities Exchange Composite Index and a set of macroeconomic variables, including money supply (M2), Value-added of industry (VAI), are used in this study. Engel-Granger, Johansen-Juselius co-integration tests and Granger Causality test are used to...
Despite the strong ability to description, OWL-S is a non-formal language and cannot verify whether there are livelock, deadlock, service compatibility and other issues. This paper seeks to use Pi-calculus to formalizing OWL-S, and transform the description of workflow patterns based on OWL-S into the description of workflow patterns in term of Pi-calculus.
Steam pipelines play an important role in industrial enterprises. They joint the heat producer and users, and constitute the energy transmission networks. The total cost on steam pipelines include the expense of steel and heat insulator, converted expense of heat loss, and construction cost. This study develops a mathematical model of total cost on steam pipelines with golden section algorithm. The...
Mobile Agent technology has broad application prospects, mobile strategy of which will directly affect the performance of Mobile Agent and even completion of its Task. Therefore, the research on self-migration calculation of Mobile Agent has theoretical significance and application value. Sequence will be regarded as a part of selective task, so this paper only discusses migration issues of Mobile...
With the changes in computing environment, the research on mobile Agent has attracted wide range of applications; Migration strategy of mobile Agent becomes one of popular research topics. Based on extended itinerary graph, this paper presents encoding scheme and data structure of sequential, selective and parallel tasks, and the using of improved genetic algorithms to solve problems of migration...
With the development of artificial intelligence, the Agent theory and technology research and application has aroused great concern and attention. Agent studies in the past, mainly research the structure of Agent. With the development of biology and psychology, joined the Agent in the emotional, increasingly attracted the attention of computer scientists. In this paper, put forward a formal model...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.