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.
Hierarchical agglomerative algorithm is widespread used in community detection of social networks. This paper explores an enhanced similarity which is based on interactive behavior of social members. The enhanced similarity expands the concept of similarity from vertexes to communities in the social network. Furthermore, the hierarchical agglomerative algorithm has been applied and the enhanced similarity...
With the development of Social Networking Services, users can publish and receive information expediently. With the scale of information to be processed is becoming bigger, the information acquisition rules adopted by traditional search engine met with many difficulties. To solve the problem, we must develop new UGC collection strategy. We think there are three main factors: user, UGC and the interactive...
In order to overcome the puzzle of optimal status being difficult to adjust after once setting PID parameters, the paper proposed a sort of auto-tuning method of fuzzy-PID parameters based on self-learning system. Combined fuzzy logic control with classical PID control, it conducted the fuzzy on-line auto-tuning of PID parameter, and after that, the parameters of adjusted system were switched to the...
In this paper, the role of local finiteness of truth values domain of fuzzy automata is analyzed, in which the truth value domain of fuzzy automata is the (commutative) lattice-ordered monoid. We introduce a hierarchy of lattice-valued fuzzy finite automata and the languages which were recognized by these automata. Besides, the role of local finiteness of truth value domain of fuzzy languages to the...
Domain ontology, as a conceptual model, provides a meaningful framework for semantic representation of textual information. In this paper, we explore the feasibility of using the ontology in solving multi-document summarization problems in the domain of disaster management. We provide an empirical study of different approaches in which the ontology has been used for summarization tasks. Extensive...
This paper presents a multivariate spectral conjugate gradient projection method (MSCGP) for solving the nonlinear monotone equations with convex constraints. The proposed method has low storage requirement and it does not need the computation of the derivative as well as the solution to some linear equations. Under some appropriate assumptions, globally convergent is established. Numerical results...
Cu/Ti metallic thin bilayer films, xCu/yTi/Si (x,y=10nm, 20nm, 30nm),were deposited by DC magnetron sputtering technique. XRD was used to examine the crystallization structures of Cu/Ti thin films. A four-point probe method was applied to measure the sheet resistance of Cu/Ti films. Sheet resistance changes obviously with the variation of Ti film thickness when Cu film thickness is smaller than 20nm...
In light of the analysis on different colorization techniques, a local motion based video colorization method integrating color transfer and color blending is put forward to restraint errors occurred in inter-frame color transfer. On this basis, an interactive processing framework for video colorization is proposed. Key frames are colorized by color blending method, the rest frames get colors from...
A modeling method based on genetic neural network used for book purchasing is put forward on account of lacking of a set of scientific and uniform purchasing mode and model in current book purchasing process. This method improves standard genetic algorithm first, and then uses the improved standard genetic algorithm as a method of feed forward neural network training and threshold value of feed forward...
With the development of power electronics technology, the three-level converter has been proposed with the low switch voltage and low output voltage harmonics. Multilevel AC - AC converter circuit topology has many advantages and has been used extensively in high output voltage field. This paper deals with the study of a thin multi-level AC-AC converter, the operating and control scheme are analyzed...
A novel three-level buck-boost type inverter is proposed in this paper. It combines the series-parallel diode-capacitor network with the traditional buck-boost converter, plus the full bridge inverter as the back stage. The new inverter can boost or lower the input voltage. The operation principle of the inverter is investigated, theoretical waveforms are shown, relevant formulas are deducted. The...
A novel push-pull three-level isolated DC-DC boost converter is invented. The new circuit topology is proposed based on the push-pull three-level converter. The idea of symmetry is applied into the invention of the new topology. This paper describes the basic circuit and the operating principle for the new circuit. Besides, some theoretical idealized waveforms are given, relevant formulas are derived,...
This paper firstly discusses the necessity of conducting personal knowledge management in the web 2.0 technology environment. On this basis, the author describes the content and characteristics of Twitter, the concepts of personal knowledge management and its processes, and elaborates the features of Twitter's application in personal knowledge management. And then from the view of practical operation,...
In this paper, we construct an integrated index for open-ended funds to describe the total return of Chinese fund market. By using multivariate GARCH model, we study the volatility relationship between the stock open-ended fund and bond open-ended fund of China. The results show that there is the volatility persistence between the index of stock open-ended funds and the integrated stock index in Chinese...
LNG is refered to the liquefied natural gas. The transport method of LNG is more flexible and convenient than that of the pipeline natural gas. What's more, compared with other energy, it is cleaner. Therefore, LNG plays an important role in the energy market. Along with the progress of LNG liquefied technology and the reduction of transportation cost, LNG trade has developed more rapidly. This article...
Network security is becoming an increasingly important issue, since the rapid development of the Internet. Network Intrusion Detection System (IDS), as the main security defending technique, is widely used against such malicious attacks. Data mining and machine learning technology has been extensively applied in network intrusion detection and prevention systems by discovering user behavior patterns...
Physical interest is the mental tendency of students to actively get to know and give priority to the participation in physical learning or physical training and one of the basic momentums for students to take part in physical activities. It is also the important factor to affect students' awareness and enthusiasm to take part in physical training in the physical education of school. This paper analyzed...
The present study was designed to examine the characteristics and development of prosocial behaviors online of adolescents. Four hundred forty-seven adolescents were assessed 6 types of prosocial behaviors online through questionnaire. The results indicated that (1) adolescents' conducted lots of prosocial behaviors on the Internet; (2) adolescents reported dire prosocial behaviors online the most,...
Arrangement of sorting sequence is an important part for formulation of stage plan on marshalling station. In this paper, we establish a model to minimize the waiting time of wagon as objective function ,and we present simulated annealing algorithm to optimize the problem of sorting sequence, through searching feasible solution in solution space, for each initial solution, we use distribution car...
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.