The Experts below are selected from a list of 22068 Experts worldwide ranked by ideXlab platform
Li Zhi-jun - One of the best experts on this subject based on the ideXlab platform.
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Fast Multiple Target Tracking Algorithm in Radar Network System
Computer Simulation, 2009Co-Authors: Li Zhi-junAbstract:Aiming at the characteristic of the radar network system, a method for Real-time multi-target tracking was proposed. First, the minimum Normalized Distance nearest neighbor assignment was used to associate the measurement data, and then Fuzzy Data Association was used to associate the local tracks with the system tracks. Finally, α-β filter was used to receive the fusion result. The simulation results of simulated data and measured data show that what we proposed is a real-time algorithm to track multi-target effectively, and it’s valuable for project use.
Wenyi Zeng - One of the best experts on this subject based on the ideXlab platform.
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Normalized Distance, similarity measure, inclusion measure and entropy of interval-valued fuzzy sets and their relationship
Information Sciences, 2008Co-Authors: Wenyi ZengAbstract:In this paper, we introduce an axiomatic definition of an interval-valued fuzzy sets' inclusion measure which is different from Bustince's [H. Bustince, Indicator of inclusion grade for interval-valued fuzzy sets, Applications to approximate reasoning based on interval-valued fuzzy sets, International Journal of Approximate Reasoning, 23 (2000) 137-209]. The relationship among the Normalized Distance, the similarity measure, the inclusion measure, and the entropy of interval-valued fuzzy sets is investigated in detail. Furthermore, six theorems are proposed showing how the similarity measure, the inclusion measure, and the entropy of interval-valued fuzzy sets can be deduced by the interval-valued fuzzy sets' Normalized Distance based on their axiomatic definitions. Some formulas have also been put forward to calculate the similarity measure, the inclusion measure, and the entropy of interval-valued fuzzy sets.
Michael B. Smith - One of the best experts on this subject based on the ideXlab platform.
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MR imaging and T2 mapping of femoral cartilage: in vivo determination of the magic angle effect.
AJR. American journal of roentgenology, 2001Co-Authors: Timothy J. Mosher, Harvey E. Smith, Bernard J. Dardzinski, Vincent J. Schmithorst, Michael B. SmithAbstract:OBJECTIVE. The purpose of this study was to perform a quantitative evaluation of the effect of static magnetic field orientation on cartilage transverse (T2) relaxation time in the intact living joint and to determine the magnitude of the magic angle effect on in vivo femoral cartilage.MATERIALS AND METHODS. Quantitative T2 maps of the femoral—tibial joint were obtained in eight asymptomatic male volunteers using a 3-T magnet. Cartilage T2 profiles (T2 vs Normalized Distance from subchondral bone) were evaluated as a function of orientation of the radial zone of cartilage with the applied static magnetic field (B0).RESULTS. At a Normalized Distance of 0.3 from bone, cartilage T2 is 8.6% longer in cartilage oriented 55° to B0 compared with cartilage oriented parallel with B0. Greater orientation variation is observed in more superficial cartilage. At a Normalized Distance of 0.6, cartilage T2 is 18.3% longer. The greatest orientation effect is observed near the articular surface where T2 is 29.1% longer at...
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MR imaging and T2 mapping of femoral cartilage: In vivo determination of the magic angle effect
2001Co-Authors: Timothy J. Mosher, Harvey E. Smith, Bernard J. Dardzinski, Vincent J. Schmithorst, Michael B. SmithAbstract:OBJECTIVE. The purpose of this study was to perform a quantitative evaluation of the effect of static magnetic field orientation on cartilage transverse (T2) relaxation time in the intact living joint and to determine the magnitude of the magic angle effect on in vivo femoral cartilage. MATERIALS AND METHODS. Quantitative T2 maps of the femoral-tibial joint were obtained in eight asymptomatic male volunteers using a 3-T magnet. Cartilage T2 profiles (T2 vs Normalized Distance from subchondral bone) were evaluated as a function of orientation of the radial zone of cartilage with the applied static magnetic field (B 0 ). RESULTS. At a Normalized Distance of 0.3 from bone, cartilage T2 is 8.6% longer in cartilage oriented 55° to B 0 compared with cartilage oriented parallel with B 0 . Greater orientation variation is observed in more superficial cartilage. At a Normalized Distance of 0.6, cartilage T2 is 18.3% longer. The greatest orientation effect is observed near the articular surface where T2 is 29.1% longer at 55°, CONCLUSION. The effect of orientation on cartilage T2 is substantially less than that predicted from prior ex vivo studies. The greatest variation in cartilage T2 is observed in the superficial 20% of cartilage. Given the small orientation effect, it is unlikely that the magic angle effect accounts for regional differences in cartilage signal intensity observed in clinical imaging. We hypothesize that regional differences in the degree of cartilage compression are primarily responsible for the observed regional differences in cartilage T2.
Wang Su-zhen - One of the best experts on this subject based on the ideXlab platform.
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Research of Text Clustering Based on Fuzzy Granular Computing
Computer Science, 2010Co-Authors: Zhang Xia, Wang Su-zhenAbstract:The traditional K-means is very sensitive to initial clustering centers and the clustering result will wave with the different initial input.To remove this sensitivity,a new method was proposed to get initial clustering centers.This method is as follows:provide a Normalized Distance function in the fuzzy granularity space of data objects,then use the function to do a initial clustering work to these data objects who has a less Distance than granularity d_λ,then get the initial clustering centers.The test shows this method has such advantages on increasing the rate of accuracy and reducing the program times.
Timothy J. Mosher - One of the best experts on this subject based on the ideXlab platform.
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MR imaging and T2 mapping of femoral cartilage: in vivo determination of the magic angle effect.
AJR. American journal of roentgenology, 2001Co-Authors: Timothy J. Mosher, Harvey E. Smith, Bernard J. Dardzinski, Vincent J. Schmithorst, Michael B. SmithAbstract:OBJECTIVE. The purpose of this study was to perform a quantitative evaluation of the effect of static magnetic field orientation on cartilage transverse (T2) relaxation time in the intact living joint and to determine the magnitude of the magic angle effect on in vivo femoral cartilage.MATERIALS AND METHODS. Quantitative T2 maps of the femoral—tibial joint were obtained in eight asymptomatic male volunteers using a 3-T magnet. Cartilage T2 profiles (T2 vs Normalized Distance from subchondral bone) were evaluated as a function of orientation of the radial zone of cartilage with the applied static magnetic field (B0).RESULTS. At a Normalized Distance of 0.3 from bone, cartilage T2 is 8.6% longer in cartilage oriented 55° to B0 compared with cartilage oriented parallel with B0. Greater orientation variation is observed in more superficial cartilage. At a Normalized Distance of 0.6, cartilage T2 is 18.3% longer. The greatest orientation effect is observed near the articular surface where T2 is 29.1% longer at...
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MR imaging and T2 mapping of femoral cartilage: In vivo determination of the magic angle effect
2001Co-Authors: Timothy J. Mosher, Harvey E. Smith, Bernard J. Dardzinski, Vincent J. Schmithorst, Michael B. SmithAbstract:OBJECTIVE. The purpose of this study was to perform a quantitative evaluation of the effect of static magnetic field orientation on cartilage transverse (T2) relaxation time in the intact living joint and to determine the magnitude of the magic angle effect on in vivo femoral cartilage. MATERIALS AND METHODS. Quantitative T2 maps of the femoral-tibial joint were obtained in eight asymptomatic male volunteers using a 3-T magnet. Cartilage T2 profiles (T2 vs Normalized Distance from subchondral bone) were evaluated as a function of orientation of the radial zone of cartilage with the applied static magnetic field (B 0 ). RESULTS. At a Normalized Distance of 0.3 from bone, cartilage T2 is 8.6% longer in cartilage oriented 55° to B 0 compared with cartilage oriented parallel with B 0 . Greater orientation variation is observed in more superficial cartilage. At a Normalized Distance of 0.6, cartilage T2 is 18.3% longer. The greatest orientation effect is observed near the articular surface where T2 is 29.1% longer at 55°, CONCLUSION. The effect of orientation on cartilage T2 is substantially less than that predicted from prior ex vivo studies. The greatest variation in cartilage T2 is observed in the superficial 20% of cartilage. Given the small orientation effect, it is unlikely that the magic angle effect accounts for regional differences in cartilage signal intensity observed in clinical imaging. We hypothesize that regional differences in the degree of cartilage compression are primarily responsible for the observed regional differences in cartilage T2.