The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Romeo Mark A. Mateo - One of the best experts on this subject based on the ideXlab platform.
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car Collision verification system for the ubiquitous parking management
Journal of Internet Computing and Services, 2011Co-Authors: Romeo Mark A. Mateo, Hyunho YangAbstract:Most researches in WSN-based parking management system used wireless sensors to monitor the Events in a car parking area. However, the problem of car Collisions in car parks was not discussed by previous researches. The car position details over time are vital in analyzing a Collision Event. This paper proposes a Collision verification method to detect and to analyze the Collision Event in the parking area, and then notifies car owners. The detection uses the information from motion sensors for comprehensive details of position and direction of a moving car, and the verification processes an object tracking technique with a fast OBB intersection test. The performance tests show that the location technique is more accurate with additional sensors and the OBB Collision test is faster compared to a normal OBB intersection test.
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KES-AMSTA - Collision Detection for Ubiquitous Parking Management Based on Multi-agent System
Agent and Multi-Agent Systems: Technologies and Applications, 2009Co-Authors: Romeo Mark A. MateoAbstract:Most of the researchers and designers of WSN-based parking management system used wireless sensors to detect the car presence in automating the parking system. However, the problem of car-to-car Collisions in the parking system was not discussed by these researches where the position details of cars are important to analyze the Collision Event. This paper presents the ubiquitous parking management system (UPMS) where the sensors are used to detect car presence and designed in multi-agent system to disseminate efficiently the information through the system. The proposed system uses a location technique based on RSS which is processed in multi-lateration method to know the position details of the cars. Also, the car active RFID (CARFID) is equipped with vibration sensors to detect the car Collision Event. The system verifies the Collision Event in the proposed oriented bounded box (OBB) intersection test. Experiment shows that the Collision detection is more accurate if more wireless sensors are used in our proposed technique.
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Collision detection for ubiquitous parking management based on multi agent system
Agent and Multi-Agent Systems: Technologies and Applications, 2009Co-Authors: Romeo Mark A. MateoAbstract:Most of the researchers and designers of WSN-based parking management system used wireless sensors to detect the car presence in automating the parking system. However, the problem of car-to-car Collisions in the parking system was not discussed by these researches where the position details of cars are important to analyze the Collision Event. This paper presents the ubiquitous parking management system (UPMS) where the sensors are used to detect car presence and designed in multi-agent system to disseminate efficiently the information through the system. The proposed system uses a location technique based on RSS which is processed in multi-lateration method to know the position details of the cars. Also, the car active RFID (CARFID) is equipped with vibration sensors to detect the car Collision Event. The system verifies the Collision Event in the proposed oriented bounded box (OBB) intersection test. Experiment shows that the Collision detection is more accurate if more wireless sensors are used in our proposed technique.
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car Collision detection for ubiquitous parking management system
한국인터넷정보학회 학술발표대회 논문집, 2008Co-Authors: Romeo Mark A. Mateo, Hyunho YangAbstract:Wireless sensors networks (WSN) is mostly used technique by research practitioners to implement their applications in ubiquitous environment. Most of the researchers and designers of WSN-based parking management system used wireless sensors to detect the car presence in automating the parking system. However, the problem of car-to-car Collisions in the parking system was not discussed by these researches where the position details of cars are important to decide which car causes the Event. This paper presents the ubiquitous parking management system (UPMS) where the sensors are used to detect car presence and designed in multi-agent system to disseminate efficiently the information through the system. The proposed system uses a location technique based on RSS which is processed in multi-lateration method to know the position details of the cars. Also, the car active RFID (CARFID) is equipped with vibration sensors to detect the car Collision Event. The system verifies the Collision Event in the proposed oriented bounded box (OBB) intersection test. Experiment shows that the Collision detection is more accurate if more wireless sensors are used in our proposed technique.
Frédéric Gruy - One of the best experts on this subject based on the ideXlab platform.
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Multi(4)-variate population balance modeling for shear aggregation in 3D space
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Frédéric Gruy, Patrice NortierAbstract:Shear aggregation of micrometric particles is an important phenomenon occurring in agitated chemical reactors. The resulting clusters of particles are porous and more or less elongated. It has previously been proved that the equivalent ellipsoid computed from the inertia tensor describes well the colliding clusters [F.Gruy and P. Nortier « Statistics about Collisions of ellipsoids under shear flow » Colloids and Surfaces A: Physicochemical and Engineering Aspects, 558(2018)250-262]. The aim of the current paper is to consider chosen kinetic and morphological aspects of the complete aggregation dynamics. Monte Carlo simulations are used as a means of investigation. Four representations of the Collision Event have been compared: the classical Collision of oriented clusters of sphere (A), the Collision of oriented equivalent ellipsoids (B), the orientation-averaged Collision of equivalent ellipsoids (C), the use of approximate expressions for C (D). For each case, the probability density functions of various morphological parameters of the cluster population are calculated as a function of the time. The comparison of the generated data shows that the approximate expressions for the aggregation kernel and the ellipsoid parameters allow for fast and representative simulations of the shear aggregation of suspensions.
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Statistics about Collisions of ellipsoids under shear flow
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018Co-Authors: Frédéric Gruy, Patrice NortierAbstract:Shear aggregation is an important phenomenon occurring during particle precipitation in a stirred chemical reactor. It concerns micro-particles that are often non-spherical or aggregated. Modelling of precipitation involves the selection of internal parameters describing the particle. Among them, morphological or geometrical descriptors are required. In this paper, the inertia or gyration tensor of primary particles and of their cluster is considered and evaluated for the modelling of aggregation. An equivalent ellipsoid is defined from the inertia tensor. In this framework, the Collision Event becomes the Collision between two equivalent ellipsoids and leads to a larger ellipsoid. The inertia tensor and the semi-axis lengths of the equivalent ellipsoid are explicitly calculated in the case of shear aggregation in a three-dimensional space. Two ways for performing these calculations are presented. The statistics of the equivalent ellipsoids associated with the set of Collision Events undergone by two given ellipsoids have been computed. Statistics includes the probability density for geometrical parameters and the average value. Collision rate constant, i.e. aggregation kernel, is also calculated. Corresponding approximate expressions are presented and checked. Finally, equivalence between the sphere cluster and the equivalent ellipsoid with respect to the aggregation act is checked and ascertained.
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Inertia tensor as morphological descriptor for aggregation dynamics
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015Co-Authors: Frédéric GruyAbstract:Multidimensional population balance modelling is a powerful tool to study the dynamics of the precipitation and particularly the aggregation of particles. This approach involves the selection of internal parameters describing the particle. Among them, morphological or geometrical descriptors are required. In this paper, the inertia or gyration tensor is considered and evaluated for the modelling of aggregation. An equivalent ellipsoid to the aggregate is defined from the tensor. Firstly, a general expression for the inertia tensor of the aggregate resulting from the Collision of two aggregates is presented. In this framework, the Collision Event becomes the Collision between two equivalent ellipsoids and leads to a larger ellipsoid. Secondly, the inertia tensor and the characteristics of the equivalent ellipsoid are explicitly calculated in the case of shear aggregation in a two-dimensional space. An approximate calculation is also presented and checked. Finally, the shear aggregation of a set of disks in a two-dimensional space is simulated using simultaneously this modelling of the Collision Event and Monte-Carlo simulations for all the Collisions. This is compared with classical Monte Carlo simulations where the colliding particles are clusters of disks. Physical properties of the cluster population as, for instance, the distribution of elongation or anisotropy factor at different times are presented.
Zhenxing Liang - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical Dynamics of a Single Platinum Nanoparticle Collision Event for the Hydrogen Evolution Reaction.
Angewandte Chemie (International ed. in English), 2018Co-Authors: Zhi-peng Xiang, Haiqiang Deng, Pekka Peljo, Suli Wang, Daniel Mandler, Gongquan Sun, Zhenxing LiangAbstract:Chronoamperometry was used to study the dynamics of Pt nanoparticle (NP) Collision with an inert ultramicroelectrode via electrocatalytic amplification (ECA) in the hydrogen evolution reaction. ECA and dynamic light scattering (DLS) results reveal that the NP colloid remains stable only at low proton concentrations (1.0 mm) under a helium (He) atmosphere, ensuring that the Collision Events occur at genuinely single NP level. Amperometry of single NP Collisions under a He atmosphere shows that each discrete current profile of the Collision Event evolves from spike to staircase at more negative potentials, while a staircase response is observed at all of the applied potentials under hydrogen-containing atmospheres. The particle size distribution estimated from the diffusion-controlled current in He agrees well with electron microscopy and DLS observations. These results shed light on the interfacial dynamics of the single nanoparticle Collision electrochemistry.
Charles Spence - One of the best experts on this subject based on the ideXlab platform.
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A comparison of different informative vibrotactile forward Collision warnings: does the warning need to be linked to the Collision Event?
PloS one, 2014Co-Authors: Robert Gray, Charles SpenceAbstract:Recent research demonstrates that auditory and vibrotactile forward Collision warnings presenting a motion signal (e.g., looming or apparent motion across the body surface) can facilitate speeded braking reaction times (BRTs). The purpose of the present study was to expand on this work by directly comparing warning signals in which the motion conveyed was constant across all Collision Events with signals in which the speed of motion was dependent on the closing velocity (CV). Two experiments were conducted using a simulated car-following task and BRTs were measured. In Experiment 1, increasing intensity (looming) vibrotactile signals were presented from a single tactor attached to the driver's waist. When the increase in intensity was CV-linked, BRTs were significantly faster as compared to a no-warning condition, however, they were not significantly different from constant intensity and CV-independent looming warnings. In Experiment 2, a vertical array of three tactors was used to create motion either towards (upwards) or away (downwards) from the driver's head. When the warning signal presented upwards motion that was CV-linked, BRTs were significantly faster than all other warning types. Downwards warnings led to a significantly higher number of brake activations in false alarm situations as compared to upwards moving warnings. The effectiveness of dynamic tactile Collision warnings would therefore appear to depend on both the link between the warning and Collision Event and on the directionality of the warning signal.
Patrice Nortier - One of the best experts on this subject based on the ideXlab platform.
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Multi(4)-variate population balance modeling for shear aggregation in 3D space
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Frédéric Gruy, Patrice NortierAbstract:Shear aggregation of micrometric particles is an important phenomenon occurring in agitated chemical reactors. The resulting clusters of particles are porous and more or less elongated. It has previously been proved that the equivalent ellipsoid computed from the inertia tensor describes well the colliding clusters [F.Gruy and P. Nortier « Statistics about Collisions of ellipsoids under shear flow » Colloids and Surfaces A: Physicochemical and Engineering Aspects, 558(2018)250-262]. The aim of the current paper is to consider chosen kinetic and morphological aspects of the complete aggregation dynamics. Monte Carlo simulations are used as a means of investigation. Four representations of the Collision Event have been compared: the classical Collision of oriented clusters of sphere (A), the Collision of oriented equivalent ellipsoids (B), the orientation-averaged Collision of equivalent ellipsoids (C), the use of approximate expressions for C (D). For each case, the probability density functions of various morphological parameters of the cluster population are calculated as a function of the time. The comparison of the generated data shows that the approximate expressions for the aggregation kernel and the ellipsoid parameters allow for fast and representative simulations of the shear aggregation of suspensions.
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Statistics about Collisions of ellipsoids under shear flow
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018Co-Authors: Frédéric Gruy, Patrice NortierAbstract:Shear aggregation is an important phenomenon occurring during particle precipitation in a stirred chemical reactor. It concerns micro-particles that are often non-spherical or aggregated. Modelling of precipitation involves the selection of internal parameters describing the particle. Among them, morphological or geometrical descriptors are required. In this paper, the inertia or gyration tensor of primary particles and of their cluster is considered and evaluated for the modelling of aggregation. An equivalent ellipsoid is defined from the inertia tensor. In this framework, the Collision Event becomes the Collision between two equivalent ellipsoids and leads to a larger ellipsoid. The inertia tensor and the semi-axis lengths of the equivalent ellipsoid are explicitly calculated in the case of shear aggregation in a three-dimensional space. Two ways for performing these calculations are presented. The statistics of the equivalent ellipsoids associated with the set of Collision Events undergone by two given ellipsoids have been computed. Statistics includes the probability density for geometrical parameters and the average value. Collision rate constant, i.e. aggregation kernel, is also calculated. Corresponding approximate expressions are presented and checked. Finally, equivalence between the sphere cluster and the equivalent ellipsoid with respect to the aggregation act is checked and ascertained.