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The leakage and diffusion accident of inflammable and explosive toxic gas has become a serious problem in the field of environment and security. Based on the optimized three-dimensional finite element model (FEM3) and the actual condition in complex and sealed space, a three-dimensional simulation system is developed to simulate the dynamic process of leakage and diffusion of gas in complex and sealed...
This paper presents a model-driven approach to developing pervasive computing applications that exploits design time information to support the engineering of planning and optimisation algorithms that reflect the presence of uncertainty, dynamism and complexity in the application domain. In particular the task of generating code to implement planning and optimisation algorithms in pervasive computing...
Search and rescue operations can greatly benefit from the use of autonomous UAVs to survey the environment and collect evidence about the position of a missing person. To minimize the time to find the victim, some fundamental parameters need to be accounted for in the design of the search algorithms: 1) quality of sensory data collected by the UAVs, 2) UAVs energy limitations, 3) environmental hazards...
In this paper, a method is proposed for reconstructing the trajectory and shape of a rigid body in a damped environment from distributively collected, asynchronous data. In this problem setting, both the shape parameters of the rigid body and its trajectory are unknown. The shape/trajectory recovery problem is modeled as a minimization of energy dissipation under geometric and acceleration constraints...
This paper compares different alternative aggregation techniques for Wireless Sensor Networks Optimization based on tree construction. The main idea is to efficiently elect parent nodes responsible of data aggregation according to their connectivity degree. Thus, the quantity of data transmitted on the network remains minimal during the transfer from all sensors towards the sink. Simulations have...
A numerical modelling methodology for the embodiment design of three-dimensional miniaturised/integrated products is developed and demonstrated. The focus is on the numerical techniques and methods that underpin the development of reduced order models (ROMs). These models are used together with methods for estimating variations in performance/quality characteristics and probabilistic optimisation...
The observations in many applications consist of counts of discrete events, such as photons hitting a detector, which cannot be effectively modeled using an additive bounded or Gaussian noise model, and instead require a Poisson noise model. As a result, accurate reconstruction of a spatially or temporally distributed phenomenon (f) from Poisson data (y) cannot be accomplished by minimizing a conventional...
Dynamic testing is often used to study the response of structures under earthquake loading. Such testing is either carried out with a prescribed input such as an earthquake ground motion, or using computation-in-the-loop, where a physical substructure is made to interact with a virtual substructure. This latter form of dynamic testing is also referred to as hybrid simulation. In both cases, the test...
Many of the current efforts in the sphere of homeland security, and national defense involve the use of fixed sites to provide sensor coverage, RF communications coverage, or RF relay coverage for terrestrial areas and/or airspace volumes. For terrestrial infrastructure, it is more cost effective to utilize existing towers/buildings for sensor/antenna sites, rather than to build new ones. If a mission...
Paper discussed collision detection techniques theoretically, including polygon and non-polygon expression of collision model, collision model's bounding box tree optimization, and query of collision. Then introduced VRML's collision sensing technique and its Collision node's syntax and application, mainly about speeding collision detection by using a simple model substitute. Finally virtual simulated...
The grating eddy current displacement sensor (GECDS) for displacement or position measurement used in watertight electronic digital caliper was described. The parameters optimization of the sensor is essential for economic and efficient production. The purpose of this study is to determine the optimal combination of the sensor parameters and analyze the effects of these parameters on the nonlinearity...
Many sensor network studies assume that the energy cost for sensing is negligible compared with the cost of communications or computing. Opportunities exist to deploy sensor networks utilizing active sensors with a high energy cost such as radar. For a node utilizing radar as its primary sensor, the actual sensing procedure is the main power consumer. In the worst case almost 50% of the power is consumed...
Recently, electric utilities decide to permanently monitor the SF6 gas level in gas insulated switchgear. This is mainly because of two reasons: The optimization of their maintenance strategy and environmental awareness associated with greenhouse gas emissions. The detection of small gas leakages is not an easy task. The authors propose a model which allows using pressure sensors. The problem of high...
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