In our work, we investigate efficient usage of TTCN-3 (Testing and Test control Notation version 3) based test components in the emerging field of distributed performance testing of communicating systems. TTCN-3 is a ...
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In our work, we investigate efficient usage of TTCN-3 (Testing and Test control Notation version 3) based test components in the emerging field of distributed performance testing of communicating systems. TTCN-3 is a high level formal specification language used for the specification of abstract test suites (ATSs) suitable for various testing purposes mainly in telecommunication systems testing. A TTCN-3 based test system may consist of several distributed parallel test components (PTCs) and can be executed utilizing diverse hardware platforms. Our aim is to aid development of load tests by establishing a framework, while collecting best practices at the same time, that can be used to execute tests over mixed hardware resources efficiently. We, mainly focus on automated and dynamic deployment of load test components implemented purely in TTCN-3. Also, the deployment method takes test system load into account by monitoring the participating workstations' behavior on-line. A potential test method is shown that can be used for testing server applications using low-cost or even legacy hardware as the platform for distributed lest components. A basic scenario involving SMTP (simple mail transfer protocol) service testing is presented as an example.
Vision, as a key perceptional capability for cognitive systems relates to rather difficult problems -such as visual object recognition, representation, categorization, and scene understanding. State-of-the-art solutio...
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Vision, as a key perceptional capability for cognitive systems relates to rather difficult problems -such as visual object recognition, representation, categorization, and scene understanding. State-of-the-art solutions, using object appearance based models, already reached certain maturity. They achieve excellent recognition performance and provide learning structures that are subsequently utilized for object recognition and tracking. However, in context of object topology understanding for cognitive tasks, these methods cannot be directly compared with human performance, because it is obvious that appearance based methods do not contribute to understanding of structures in 3D. Research findings from infant psychology and animal investigation give evidence for using hierarchical models of object representation, based on image primitives e.g. such as edges, corners, shading or homogeneity of object colors. It is the objective of this paper to present an approach based on both, findings from biological studies and cognitive science, as enablers for autonomous cognitive investigation of natural scenes and their understanding. We present the architecture of a compound cognitive framework and its first behavioral level with the implementation of a vision model of the mammalian striate visual cortex in five layers. The proposed implementation is exemplified with an object similar to the Necker cube.
Tracking multiple targets is a great challenge for most tracking algorithms, since these algorithms tend to loose some of the targets when they get close to each other. Hence, several algorithms like the MHT, the JPDA...
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ISBN:
(纸本)9728865600
Tracking multiple targets is a great challenge for most tracking algorithms, since these algorithms tend to loose some of the targets when they get close to each other. Hence, several algorithms like the MHT, the JPDAF and the PMHT have been developed for this task. However, these algorithms are specialized on punctiform targets, whereas in mobile robotics one has to deal with extended targets. Therefore, in this paper an algorithm is proposed that can solve this problem. It uses the Viterbi algorithm and some geometrical characteristics of the problem. The proposed algorithm was tested with real world data.
This paper proposes a Particle-Filter approach and a set of motion strategies to cooperatively localize a team of three robots. The allocated mission consists on the path following of a closed trajectory and obstacle ...
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ISBN:
(纸本)9728865600
This paper proposes a Particle-Filter approach and a set of motion strategies to cooperatively localize a team of three robots. The allocated mission consists on the path following of a closed trajectory and obstacle avoidance in isolated and unstructured scenarios. The localization methodology required for the correct path following relies on distance and orientation measurements among the robots and the robots and a fixed active beacon. Simulation results are presented.
Throughout history, spoken language and face-to-face communication have been the primary mechanics of interaction between two or more people. While processing speech, it is often advantageous to determine the emotion ...
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ISBN:
(纸本)9728865600
Throughout history, spoken language and face-to-face communication have been the primary mechanics of interaction between two or more people. While processing speech, it is often advantageous to determine the emotion of the speaker in order to better understand the context of the meaning. This paper looks at our current effort at creating a static based emotion detection system, using previously used techniques along with a custom FPGA neural network to speed up recognition rates.
Networked robotics is an area that straddles robotics and network technology. A robot system controlled via the WWW exploits the Internet network and hence is one realisation of networked robotics. A set of field robo...
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ISBN:
(纸本)9728865600
Networked robotics is an area that straddles robotics and network technology. A robot system controlled via the WWW exploits the Internet network and hence is one realisation of networked robotics. A set of field robots that exploit wireless networks to share and distribute tasks might also be considered an exemplar of networked robotics. But isn't this just an exemplar of distributed robotics? And if so, what does networked robotics bring to the 'robotics' table? These are questions and issues addressed in this paper. The paper will propose that networks are at once both enabling and constraining to robotics. They enlarge the scope of the robotics discipline yet introduce challenges that must be overcome if that potential is to be fully realized. In short, when the network becomes a design issue - normally when performance of the system is at a premium - networked robotics is at play.
in the article we present various theoretical and experimental approaches to the problem of stereo matching and disparity estimation. We propose to calculate stereo disparity in the moments space, but we also present ...
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ISBN:
(纸本)9728865600
in the article we present various theoretical and experimental approaches to the problem of stereo matching and disparity estimation. We propose to calculate stereo disparity in the moments space, but we also present correlation based method. In order to calculate disparity vector we decided to use discrete orthogonal moments of Tchebichef, Zernike and Legendre. In our research of stereo disparity estimation all of these moments were tested and compared. In the article we also propose the original method of determining the global displacement vector between the stereopair images in order to find the common part of these images (adequate for matching) and the margins of these stereo images. Experimental results confirm effectiveness of the presented methods of determining stereo disparity and stereo matching for robotics and machine vision applications.
"The URC (Ubiquitous Robotic Companion, Server computer-based networked robotic)" systems exploiting Internet-related technologies and Server computer require effective techniques for timely delivery of requ...
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ISBN:
(纸本)9728865600
"The URC (Ubiquitous Robotic Companion, Server computer-based networked robotic)" systems exploiting Internet-related technologies and Server computer require effective techniques for timely delivery of requested data to remote clients. In these systems, there is a need to process real-time data in server computer from/to robots and clients during system operation. In this paper, we describe and evaluate ASR, TTS server systems in the context of a real-time environment for the URC applications. Experimental results show that the server-based ASR, TTS support timely delivery of data to a potentially large number of robots during system operation.
In this paper we describe an original method for the 3D free form object tracking in monocular vision. The main contribution of this article is the use of the skeleton of an object in order to recognize, locate and tr...
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ISBN:
(纸本)9728865600
In this paper we describe an original method for the 3D free form object tracking in monocular vision. The main contribution of this article is the use of the skeleton of an object in order to recognize, locate and track this object in real time. Indeed, the use of this kind of representation made it possible to avoid difficulties related to the absence of prominent elements in free form objects (which makes the matching process easier). The skeleton is a lower dimension representation of the object, it is homotopic and it has a graph structure. This allowed us to use powerful tools of the graph theory in order to perform matching between scene objects and models (recognition step). Thereafter, we used skeleton extremities as interest points for the tracking.
This paper reviews the design and development of a human arm-like mechanical manipulator, which is the basis of research currently being undertaken at Lancaster University, in order to address the complex tasks found ...
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ISBN:
(纸本)9728865600
This paper reviews the design and development of a human arm-like mechanical manipulator, which is the basis of research currently being undertaken at Lancaster University, in order to address the complex tasks found in the rapidly expanding field of nuclear decommissioning. The requirements of multi-arm robot architecture for use in decommissioning tasks are discussed. The manipulators are integrated to work cooperatively and perform similar functions to humans in both scale and dexterity. The role that automation and robotics can play in enabling quicker demolition and at the same time reducing the exposure of workers to harmful radiation is examined. The key issues surrounding radioactive materials and safe dose levels are explained. The different stages of a particular system engineering process are outlined together with the essential physical steps. The paper will conclude by identifying the compliance of the system engineering used here with the requirements of designing a multi-arm robot.
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