The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Liu Dan-dan - One of the best experts on this subject based on the ideXlab platform.
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Virtual Assembly System of Submarine Based on Virtual Reality
Computer Simulation, 2006Co-Authors: Liu Dan-danAbstract:This system is a virtual assembly system of submarine based on virtual reality technology.The system uses Creator/Vega,software of virtual reality,to create very real virtual environment of assembly and makes users feeling present to moving or rolling models optionally with the help of space-ball and position-tracker to finish assembly operation.And this system uses VGIS-VOLUME,a means of volume-Isector technology to conduct Intersection Tests in vega,is applied to resolve the bottle-neck of Intersection Test in virtual assembly.This system sharply shortenes design cycle and saves production cost.
Meng Jun - One of the best experts on this subject based on the ideXlab platform.
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efficient approach based on hybrid bounding volume hierarchy for real time collision detection
Computer Simulation, 2008Co-Authors: Zhu Yuanfeng, Meng JunAbstract:Oriented bounding box (OBB) hierarchy is a popular and efficient approach for accelerating collision detection (CD) among complex rigid models, but it can’t determine the contact status among objects far away as fast as other bounding volumes (BVs), such as axis-aligned bounding boxes (AABB) or sphere BV, because each Intersection Test of OBBs is much more complex than that of others. Through a method of real-time collision detection using hybrid bounding volume hierarchy (HBVH) with OBB and sphere BV, a fast Intersection Test was used to overlap Test among two objects far away by using sphere vs. sphere Test or sphere vs. OBB Test, and also accurately determine the contact status among objects in closer proximity by OBB vs. OBB Test. It is implemented and compared with other competitive algorithm of OBB. Experimental results prove that the HBVH algorithm is a precision and efficient approach for complex models in real-time collision detection.
Stefan B Ttcher - One of the best experts on this subject based on the ideXlab platform.
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Testing Intersection of XPath Expressions under DTDs
Proceedings. International Database Engineering and Applications Symposium 2004. IDEAS '04., 1Co-Authors: Stefan B TtcherAbstract:XPath expressions play a central role in both querying XML databases and searching for XML data which is distributed over the web. Our work focuses on XPath query optimization for XML data, which is distributed over several nodes in a database or several nodes on the web, and which follows a single global schema defined by a DTD, i.e. multiple nodes contain fragments of a global ?virtual? XML document. Whenever the accessible XML content stored in a node is described by an XPath expression, it may be considerably advantageous to search for XML data only on those nodes which contain a relevant fragment of the distributed ?virtual? XML document. To enable this optimization, we present an Intersection Test for XPath expressions that works on the DTD and on the XPath expressions alone, i.e. it does not require any access to XML fragments. The key idea is to construct a graph containing all paths selected by one XPath expression and to show that none of these paths can be selected by the other XPath expression in any document that is valid according to a given DTD.
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.
Lauren M. Mcintyre - One of the best experts on this subject based on the ideXlab platform.
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Intersection Tests for single marker QTL analysis can be more powerful than two marker QTL analysis.
BMC genetics, 2003Co-Authors: Cynthia J. Coffman, Rebecca W. Doerge, Marta L. Wayne, Lauren M. McintyreAbstract:Background It has been reported in the quantitative trait locus (QTL) literature that when Testing for QTL location and effect, the statistical power supporting methodologies based on two markers and their estimated genetic map is higher than for the genetic map independent methodologies known as single marker analyses. Close examination of these reports reveals that the two marker approaches are more powerful than single marker analyses only in certain cases. Simulation studies are a commonly used tool to determine the behavior of Test statistics under known conditions. We conducted a simulation study to assess the general behavior of an Intersection Test and a two marker Test under a variety of conditions. The study was designed to reveal whether two marker Tests are always more powerful than Intersection Tests, or whether there are cases when an Intersection Test may outperform the two marker approach. We present a reanalysis of a data set from a QTL study of ovariole number in Drosophila melanogaster.
