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"Temporal Information Processing Technology and Its Applications" systematically studies temporal information processing technology and its applications. The book covers following subjects: 1) time model, calculus and logic; 2) temporal data models, semantics of temporal variable ‘now’ temporal database concepts; 3) temporal query language, a typical temporal database management system:...
This paper presents a working solid-state coaxial carbon fiber micro supercapacitor with more than 100X smaller diameter as compared with the state-of-art, including: (1) an overall size of 10μm in diameter; (2) well-controlled electrodeposition and mechanical pulling processes for electrolyte and electrode coatings toward high volumetric energy density and power density; and (3) scalable and low-cost...
Overhead transmission line icing is one of the main factors affecting safety and reliability of power grid, and the cascading failure may occur due to the iced transmission line. In this paper, a risk evaluation method is proposed to evaluate the cascading failure risk caused by the transmission line icing. Based on the ice accretion model of the transmission line, a piecewise linear model of the...
With the development of power grid in China, multi-infeed HV AC/DC systems are embedded into South China power grid and East China power grid. Multi-infeed short circuit ratio (MSCR) can simultaneously reflect the strength degree of HVAC systems and interaction among HVDC systems, so it is an important reference index in the construction of multi-infeed HVDC power system. The factors influencing MSCR...
Online social networks (OSN) have become more and more popular and have accumulated a great many users. Friend recommendation can help users discover their interested friends and alleviate the problem of information overload. However, most of existing recommendation methods only consider user link or content information and hence are not effective enough to provide high quality recommendations. In...
Kernel Malware resides and performs malicious functions in the operating system kernel space. It is more difficult to be detected and cleared than the malwares implemented in the user space because of its higher authority. It also has better flexibility compared with the malware based on the firmware. As a result, the kernel malware is one of the challenging threats in information security. This paper...
Instant Messaging systems are widely used in social software, especially in the mobile Internet era. With the diversified and rapid development of mobile terminal, the systems play an important role in the mobile platform. In this paper, we introduce a kind of technology to implement the cross-platform instant messaging system, which through the HTTP protocol, XMPP protocol, TCP protocol and SSH,...
The paper studies a method for recommendation based on community partition applying for user in social network. Firstly, the largest connected component in friend-relationship complex network are taken as the logic unit, and divide up the largest connected component into non-intersect kernel sub-network, the kernel sub-network based on The maximum complete sub-graph which has the mathematics foundation...
With regard to the real-time adjustment for conflict-free taxiing route planning of A-SMGCS aircrafts on airport surface, a colored taxiway-oriented Petri net model was proposed. The process of aircrafts accessing an airport road section according to the planned time windows could be interpreted as the access priority of aircrafts for a road section. Aircraft taxiing route was adjusted by decreasing...
MLAT (Multilateration) techniques have been successfully deployed for airport surveillance for quite some time now, it makes use of signals transmitted by an aircraft to calculate the position of aircraft. However, Multilateration techniques when applied in a wide area surveillance environment for aircraft target positioning, for the impact of Geometric Dilution of Precision (GDOP), the three-dimensional...
This paper presents the design and simulation of a Q band gyrotron backward wave oscillator (Gyro-BWO) which is operated at fundamental TE01 mode. A tapered interaction circuit with distributed wall loss is employed to suppress both the transverse and axial mode competitions. A nonlinear code is used to study the starting oscillation condition and interaction behavior. A simulation result of 127 kW...
The paper introduce a particle simulation of a Q-band gyro-TWT operating in the circular waveguide TE01 mode at the fundamental cyclotron harmonic. The simulation predict that it can produce an output peak power over 265 kW at 46.5GHz, corresponding to a 37.8% efficiency, 47.2 dB gain, the 3dB bandwidth is about 3.5GHz. The potential backward wave oscillations (BWOs) TE11 TE21 and TE02 spurious modes...
The growing emergence of a variety of network applications have stringent Quality of Service (QoS) requirements which cannot be always met by the best-effort Internet. To provide QoS, several QoS frameworks have been explored over last two decades, but none of them has been truly successful and globally implemented. This paper proposes QOF, a novel QoS framework based on the OpenFlow. It uses the...
According to the algorithms based on Gaussian assumption are not accurate due to the presence of non-Gaussian signals and noise in the real environment. In this paper, a non-Gaussian noise model based on alpha stable distribution is set, and a time-delay estimation algorithm based on fractional lower order statistics is studied, where fractional lower order covariance matrix makes the time-delay estimation...
Role-Based Collaboration (RBC) is a computational thinking methodology where roles provide an underlying mechanism to facilitate abstraction, classification, separation of concerns, dynamics, and interactions. From a meta theoretical perspective, the specification of groups, roles and agents is a critical element of RBC. In consideration of the relationships and hierarchies faced by groups, roles...
In a typical virtualized cloud system, network-attached storage (NAS) is the common technology for storing the disk image files of virtual machine (VM). Although the client/server model on NAS is more reliable and manageable, a concurrent accessing behavior from multiple VMs on the shared NAS server may exhaust the underlying network bandwidth, thus hurting the disk I/O performance of VMs. In this...
For the data sparsity and malicious behavior problems of traditional collaborative filtering algorithm, the paper introduces a new kind of social network-based collaborative filtering algorithm. In order to improve the accuracy of the personalized recommendation technology, we first define empty state in the state space of multi-dimensional semi-Markov processes and obtain extended multi-dimensional...
Social networks are very dynamic objects, since new edges and vertices are added to the graph over the time. Link prediction is an important task in social network analysis and is useful in many application domains. In the recent years, there is significant interest in methods that represent the social network in the form of a graph and leverage topological and semantic measures of similarity between...
The problem of discovering covert nodes in social network has been widely studied because of its tremendous number of applications in determining critical points in social network, such as detecting terrorist, recommending item for possible customer, finding the source of spreading gossip, etc. In this paper, we utilize game theory to solve this problem. Firstly, we propose the model which analyzes...
The significance of time in information production and consumption has been recognised in information retrieval research. Temporal information plays an important role in the webpage retrieval. The webpage has both the temporal metadata and temporal semantics in the content. However, the existing search engines conduct the information retrieval based on text keywords rather than temporal semantics...
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