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排序方式: 共有761条查询结果,搜索用时 15 毫秒
21.
Dan Chen Roland Ewald Georgios K. Theodoropoulos Ton Oguara Brian Logan 《Journal of Systems and Software》2008,81(12):2345-2360
Distributed simulation has emerged as an important instrument for studying large-scale complex systems. Such systems inherently consist of a large number of components, which operate in a large shared state space interacting with it in highly dynamic and unpredictable ways. Optimising access to the shared state space is crucial for achieving efficient simulation executions. Data accesses may take two forms: locating data according to a set of attribute value ranges (range query) or locating a particular state variable from the given identifier (ID query and update). This paper proposes two alternative routing approaches, namely the address-based approach, which locates data according to their address information, and the range-based approach, whose operation is based on looking up attribute value range information along the paths to the destinations. The two algorithms are discussed and analysed in the context of PDES-MAS, a framework for the distributed simulation of multi-agent systems, which uses a hierarchical infrastructure to manage the shared state space. The paper introduces a generic meta-simulation framework which is used to perform a quantitative comparative analysis of the proposed algorithms under various circumstances. 相似文献
22.
Decision trees are well-known and established models for classification and regression. In this paper, we focus on the estimation
and the minimization of the misclassification rate of decision tree classifiers. We apply Lidstone’s Law of Succession for
the estimation of the class probabilities and error rates. In our work, we take into account not only the expected values
of the error rate, which has been the norm in existing research, but also the corresponding reliability (measured by standard
deviations) of the error rate. Based on this estimation, we propose an efficient pruning algorithm, called k-norm pruning, that has a clear theoretical interpretation, is easily implemented, and does not require a validation set.
Our experiments show that our proposed pruning algorithm produces accurate trees quickly, and compares very favorably with
two other well-known pruning algorithms, CCP of CART and EBP of C4.5.
Editor: Hendrik Blockeel. 相似文献
23.
Dimitrios Tzovaras Konstantinos Moustakas Georgios Nikolakis Michael G. Strintzis 《Personal and Ubiquitous Computing》2009,13(1):51-58
This paper presents a mixed reality tool developed for the training of the visually impaired based on haptic and auditory
feedback. The proposed approach focuses on the development of a highly interactive and extensible Haptic Mixed Reality training
system that allows visually impaired to navigate into real size Virtual Reality environments. The system is based on the use
of the CyberGrasp™ haptic device. An efficient collision detection algorithm based on superquadrics is also integrated into
the system so as to allow real time collision detection in complex environments. A set of evaluation tests is designed in
order to identify the importance of haptic, auditory and multimodal feedback and to compare the MR cane against the existing
Virtual Reality cane simulation system. 相似文献
24.
Anwar Syed Muhammad Irmakci Ismail Torigian Drew A. Jambawalikar Sachin Papadakis Georgios Z. Akgun Can Ellermann Jutta Akcakaya Mehmet Bagci Ulas 《Journal of Signal Processing Systems》2022,94(5):497-510
Journal of Signal Processing Systems - Segmentation of thigh tissues (muscle, fat, inter-muscular adipose tissue (IMAT), bone, and bone marrow) from magnetic resonance imaging (MRI) scans is useful... 相似文献
25.
Christos Bouras Apostolos Gkamas Georgios Kioumourtzis 《Journal of Network and Systems Management》2011,19(2):143-177
In this paper, we present Adaptive Smooth Simulcast Protocol (ASSP) for simulcast transmission of multimedia data over best-effort
networks. ASSP is a new multiple-rate protocol that implements a single rate TCP-friendly protocol as the underlying congestion
control mechanism for each simulcast stream. The key attributes of ASSP are: (a) TCP-friendly behavior, (b) adaptive per-stream
transmission rates, (c) adaptive scalability to large sets of receivers and (d) smooth transmission rates that are suitable
for multimedia applications. We evaluate the performance of ASSP under an integrated simulation environment which combines
the measurements of both network and video performance metrics. We also compare ASSP against other proposed solutions and
the results demonstrate that the performance of ASSP is significantly better than the tested solutions. Finally, ASSP is a
practical solution with very low implementation complexity for video transmission over best-effort networks. 相似文献
26.
This paper describes DLEJena, a practical reasoner for the OWL 2 RL profile that combines the forward-chaining rule engine of Jena and the Pellet DL reasoner. This combination is based on rule templates, instantiating at run-time a set of ABox OWL 2 RL/RDF Jena rules dedicated to a particular TBox that is handled by Pellet. The goal of DLEJena is to handle efficiently, through instantiated rules, the OWL 2 RL ontologies under direct semantics, where classes and properties cannot be at the same time individuals. The TBox semantics are treated by Pellet, reusing in that way efficient and sophisticated TBox DL reasoning algorithms. The experimental evaluation shows that DLEJena achieves more scalable ABox reasoning than the direct implementation of the OWL 2 RL/RDF rule set in the Jena’s production rule engine, which is the main target of the system. DLEJena can be also used as a generic framework for applying an arbitrary number of entailments beyond the OWL 2 RL profile. 相似文献
27.
Vasiliki L. KakaliPanagiotis G. Sarigiannidis Georgios I. Papadimitriou Andreas S. Pomportsis 《Computers & Mathematics with Applications》2011,62(1):474-485
A new machine learning framework is introduced in this paper, based on the hidden Markov model (HMM), designed to provide scheduling in dynamic wireless push systems. In realistic wireless systems, the clients’ intentions change dynamically; hence a cognitive scheduling scheme is needed to estimate the desirability of the connected clients. The proposed scheduling scheme is enhanced with self-organized HMMs, supporting the network with an estimated expectation of the clients’ intentions, since the system’s environment characteristics alter dynamically and the base station (server side) has no a priori knowledge of such changes. Compared to the original pure scheme, the proposed machine learning framework succeeds in predicting the clients’ information desires and overcomes the limitation of the original static scheme, in terms of mean delay and system efficiency. 相似文献
28.
In this paper, we consider the robust interpretation of Metric Temporal Logic (MTL) formulas over signals that take values in metric spaces. For such signals, which are generated by systems whose states are equipped with non-trivial metrics, for example continuous or hybrid, robustness is not only natural, but also a critical measure of system performance. Thus, we propose multi-valued semantics for MTL formulas, which capture not only the usual Boolean satisfiability of the formula, but also topological information regarding the distance, ε, from unsatisfiability. We prove that any other signal that remains ε-close to the initial one also satisfies the same MTL specification under the usual Boolean semantics. Finally, our framework is applied to the problem of testing formulas of two fragments of MTL, namely Metric Interval Temporal Logic (MITL) and closed Metric Temporal Logic (clMTL), over continuous-time signals using only discrete-time analysis. The motivating idea behind our approach is that if the continuous-time signal fulfills certain conditions and the discrete-time signal robustly satisfies the temporal logic specification, then the corresponding continuous-time signal should also satisfy the same temporal logic specification. 相似文献
29.
Temporal logic motion planning for dynamic robots 总被引:1,自引:0,他引:1
In this paper, we address the temporal logic motion planning problem for mobile robots that are modeled by second order dynamics. Temporal logic specifications can capture the usual control specifications such as reachability and invariance as well as more complex specifications like sequencing and obstacle avoidance. Our approach consists of three basic steps. First, we design a control law that enables the dynamic model to track a simpler kinematic model with a globally bounded error. Second, we built a robust temporal logic specification that takes into account the tracking errors of the first step. Finally, we solve the new robust temporal logic path planning problem for the kinematic model using automata theory and simple local vector fields. The resulting continuous time trajectory is provably guaranteed to satisfy the initial user specification. 相似文献
30.
Fuzzy distributed cooperative tracking for a swarm of unmanned aerial vehicles with heterogeneous goals 总被引:1,自引:0,他引:1
Georgios P. Kladis Prathyush P. Menon Christopher Edwards 《International journal of systems science》2016,47(16):3803-3811
This article proposes a systematic analysis for a tracking problem which ensures cooperation amongst a swarm of unmanned aerial vehicles (UAVs), modelled as nonlinear systems with linear and angular velocity constraints, in order to achieve different goals. A distributed Takagi–Sugeno (TS) framework design is adopted for the representation of the nonlinear model of the dynamics of the UAVs. The distributed control law which is introduced is composed of both node and network level information. Firstly, feedback gains are synthesised using a parallel distributed compensation (PDC) control law structure, for a collection of isolated UAVs; ignoring communications among the swarm. Then secondly, based on an alternation-like procedure, the resulting feedback gains are used to determine Lyapunov matrices which are utilised at network level to incorporate into the control law, the relative differences in the states of the vehicles, and to induce cooperative behaviour. Eventually stability is guaranteed for the entire swarm. The control synthesis is performed using tools from linear control theory: in particular the design criteria are posed as linear matrix inequalities (LMIs). An example based on a UAV tracking scenario is included to outline the efficacy of the approach. 相似文献