The Experts below are selected from a list of 24792 Experts worldwide ranked by ideXlab platform
Zheng Guoyan - One of the best experts on this subject based on the ideXlab platform.
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Augmented marker tracking for peri-acetabular osteotomy surgery.
'Springer Science and Business Media LLC', 2022Co-Authors: Pflugi Silvio, Vasireddy, Radhakrishna Rakesh, Lerch Till, Ecker, Timo Michael, Tannast Moritz, Boemke Nane, Siebenrock Klaus-arno, Zheng GuoyanAbstract:OBJECTIVE To develop a hybrid augmented marker-based navigation system for acetabular reorientation during peri-acetabular osteotomy (PAO). METHODS The system consists of a tracking unit attached to the patient's pelvis, augmented marker attached to the acetabular fragment and a Host Computer to do all the computations and visualization. The augmented marker is comprised of an external planar Aruco marker facing toward the tracking unit and an internal inertial measurement unit (IMU) to measure its orientation. The orientation output from the IMU is sent to the Host Computer. The tracking unit streams a live video of the augmented marker to the Host Computer, where the planar marker is detected and its pose is estimated. A Kalman filter-based sensor fusion combines the output from marker tracking and the IMU. We validated the proposed system using a plastic bone study and a cadaver study. Every time, we compared the inclination and anteversion values measured by the proposed system to those from a previously developed optical tracking-based navigation system. RESULTS Mean absolute differences for inclination and anteversion were 1.34 ([Formula: see text]) and 1.21 ([Formula: see text])[Formula: see text], respectively, for the cadaver study. Mean absolute differences were 1.63 ([Formula: see text]) and 1.55 ([Formula: see text])[Formula: see text] for inclination and anteversion for the plastic bone study. In both validation studies, very strong correlations were observed. CONCLUSION We successfully demonstrated the feasibility of our system to measure the acetabular orientation during PAO
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Augmented marker tracking for peri-acetabular osteotomy surgery.
'Institute of Electrical and Electronics Engineers (IEEE)', 2017Co-Authors: Pflugi Silvio, Vasireddy, Radhakrishna Rakesh, Lerch Till, Ecker, Timo Michael, Tannast Moritz, Boemke Nane, Siebenrock Klaus-arno, Zheng GuoyanAbstract:We developed and validated a small, easy to use and cost-effective augmented marker-based hybrid navigation system for peri-acetabular osteotomy (PAO) surgery. The hybrid system consists of a tracking unit directly placed on the patient's pelvis, an augmented marker with an integrated inertial measurement unit ('MU) attached to the patient's acetabular fragment and the Host Computer. The tracking unit sends a live video stream of the marker to the Host Computer where the marker's pose is estimated. The augmented marker with the 'MU sends its pose estimate to the Host Computer where we apply sensor fusion to compute the final marker pose estimate. The Host Computer then tracks the orientation of the acetabular fragment during peri-acetabular osteotomy surgery. Anatomy registration is done using a previously developed registration device. A Kalman filter-based sensor fusion was added to complete the system. A plastic bone study was performed for validation between an optical tracking-based navigation system and our proposed system. Mean absolute difference for inclination and anteversion was 1.63 degrees and 1.55 degrees, respectively. The results show that our system is able to accurately measure the orientation of the acetabular fragment
Liu Ruixiang - One of the best experts on this subject based on the ideXlab platform.
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the implementation and application of programming port communication between industry pc and mitsubishi fx series plc
IEEE International Conference on Intelligent Systems and Knowledge Engineering, 2008Co-Authors: Sun Jian, Lu Peng, Fu Yaqiong, Liu RuixiangAbstract:In this paper, a programming port communication protocol of Mitsubishi FX series PLC is introduced and studied. A part of communication program based on LabVIEW is presented. The serial communication between PLC and industry PC (Host Computer) is implemented, which is a simple hardware structure and quite practicable. This communication has been applied successfully in the supervisory system which is introduced in this paper. It has substituted for the configuration software and also realized the data supervision through the Host Computer. What?s more, the advantage of high efficiency and low price by using this communication is doomed to win great favor.
Kunihiro Kitamura - One of the best experts on this subject based on the ideXlab platform.
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error evaluation in the design of a special purpose processor that calculates nonbonded forces in molecular dynamics simulations
Journal of Computational Chemistry, 1995Co-Authors: Takashi Amisaki, Takaji Fujiwara, Akihiro Kusumi, Hiroo Miyagawa, Kunihiro KitamuraAbstract:Special-purpose parallel machines that are plugged into a workstation to accelerate molecular dynamics (MD) simulations are attracting a considerable amount of interest. These machines comprise scalable homogeneous multiprocessors for calculating nonbonded forces (Coulombic and van der Waals forces), which consume more than 99% of the central processing unit (CPU) time in standard MD simulations. Each processor element in the machine has a pipeline architecture to calculate the total nonbonded force exerted on a particle by all of the other particles using information regarding the coordinates, the electric charge, and the species of each particle broadcast by the Host Computer. The processor then sends the calculated force back to the Host Computer. This article addresses the precision of the calculated nonbonded forces in the design of a processor LSI with minimal complexity. The precision of the arithmetic inside the processor that is required to calculate forces for MD simulations using Verlet's procedure was critically evaluated. Forward and backward error analysis, coupled with numerical MD experiments on one-dimensional systems, was performed, and the following results were obtained: (1) Each element of the position vector which the processor receives from the Host Computer should have a precision of at least 25 bits; and (2) the pairwise forces should be calculated using floating point numbers with at least 29 bits of mantissa in the processor. Calculation of a pairwise force, which involves second-order polynomial interpolation using a table-driven algorithm, requires a key which contains a duplicate of at least 11 most significant bits of mantissa of the squared pairwise distance. The final result was that (3) the total force that acts on a particle, which is obtained by summing the forces exerted by all of the other particles, should be calculated using an accumulator that has a mantissa of at least 48 bits. © 1995 by John Wiley & Sons, Inc.
Pflugi Silvio - One of the best experts on this subject based on the ideXlab platform.
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Augmented marker tracking for peri-acetabular osteotomy surgery.
'Springer Science and Business Media LLC', 2022Co-Authors: Pflugi Silvio, Vasireddy, Radhakrishna Rakesh, Lerch Till, Ecker, Timo Michael, Tannast Moritz, Boemke Nane, Siebenrock Klaus-arno, Zheng GuoyanAbstract:OBJECTIVE To develop a hybrid augmented marker-based navigation system for acetabular reorientation during peri-acetabular osteotomy (PAO). METHODS The system consists of a tracking unit attached to the patient's pelvis, augmented marker attached to the acetabular fragment and a Host Computer to do all the computations and visualization. The augmented marker is comprised of an external planar Aruco marker facing toward the tracking unit and an internal inertial measurement unit (IMU) to measure its orientation. The orientation output from the IMU is sent to the Host Computer. The tracking unit streams a live video of the augmented marker to the Host Computer, where the planar marker is detected and its pose is estimated. A Kalman filter-based sensor fusion combines the output from marker tracking and the IMU. We validated the proposed system using a plastic bone study and a cadaver study. Every time, we compared the inclination and anteversion values measured by the proposed system to those from a previously developed optical tracking-based navigation system. RESULTS Mean absolute differences for inclination and anteversion were 1.34 ([Formula: see text]) and 1.21 ([Formula: see text])[Formula: see text], respectively, for the cadaver study. Mean absolute differences were 1.63 ([Formula: see text]) and 1.55 ([Formula: see text])[Formula: see text] for inclination and anteversion for the plastic bone study. In both validation studies, very strong correlations were observed. CONCLUSION We successfully demonstrated the feasibility of our system to measure the acetabular orientation during PAO
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Augmented marker tracking for peri-acetabular osteotomy surgery.
'Institute of Electrical and Electronics Engineers (IEEE)', 2017Co-Authors: Pflugi Silvio, Vasireddy, Radhakrishna Rakesh, Lerch Till, Ecker, Timo Michael, Tannast Moritz, Boemke Nane, Siebenrock Klaus-arno, Zheng GuoyanAbstract:We developed and validated a small, easy to use and cost-effective augmented marker-based hybrid navigation system for peri-acetabular osteotomy (PAO) surgery. The hybrid system consists of a tracking unit directly placed on the patient's pelvis, an augmented marker with an integrated inertial measurement unit ('MU) attached to the patient's acetabular fragment and the Host Computer. The tracking unit sends a live video stream of the marker to the Host Computer where the marker's pose is estimated. The augmented marker with the 'MU sends its pose estimate to the Host Computer where we apply sensor fusion to compute the final marker pose estimate. The Host Computer then tracks the orientation of the acetabular fragment during peri-acetabular osteotomy surgery. Anatomy registration is done using a previously developed registration device. A Kalman filter-based sensor fusion was added to complete the system. A plastic bone study was performed for validation between an optical tracking-based navigation system and our proposed system. Mean absolute difference for inclination and anteversion was 1.63 degrees and 1.55 degrees, respectively. The results show that our system is able to accurately measure the orientation of the acetabular fragment
Sun Jian - One of the best experts on this subject based on the ideXlab platform.
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the implementation and application of programming port communication between industry pc and mitsubishi fx series plc
IEEE International Conference on Intelligent Systems and Knowledge Engineering, 2008Co-Authors: Sun Jian, Lu Peng, Fu Yaqiong, Liu RuixiangAbstract:In this paper, a programming port communication protocol of Mitsubishi FX series PLC is introduced and studied. A part of communication program based on LabVIEW is presented. The serial communication between PLC and industry PC (Host Computer) is implemented, which is a simple hardware structure and quite practicable. This communication has been applied successfully in the supervisory system which is introduced in this paper. It has substituted for the configuration software and also realized the data supervision through the Host Computer. What?s more, the advantage of high efficiency and low price by using this communication is doomed to win great favor.
