The Experts below are selected from a list of 13896 Experts worldwide ranked by ideXlab platform
Masahiro Kurosaka - One of the best experts on this subject based on the ideXlab platform.
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A development of navigation system with image segmentation in mosaicplasty of the knee
2012 IEEE International Conference on Fuzzy Systems, 2012Co-Authors: Takayasu Toyoshima, Kouki Nagamune, Daisuke Araki, Tomoyuki Matsumoto, Seiji Kubo, Takehiko Matsushita, Ryosuke Kuroda, Masahiro KurosakaAbstract:Mosaicplasty is a surgery that transplants osteochondral grafts for osteochondritis dissecans. In mosaicplasty, cylindrical osteochondral grafts are harvested from normal area, and transplanted to injured area. The one of the most important things of this surgery is that the graft should be perpendicular to the Surface of the cartilage. The navigation system that aims improvement of precision has been already studied, however cannot be applied to use an endoscope. In addition, it is a problem to have low precision of the transplant in the freehand. Therefore, we thought that the system would be widely used if we develop the mosaicplasty navigation system under an endoscope. This study proposes a navigation system to determine a proper position and pose for harvesting. In the experiments, a femoral imitation bone was used as a profile of the femoral Joint Surface. The experiment consists of the following three procedures: Scan and display of the femoral Joint Surface profile. Display of a normal vector for the femoral Joint Surface and a harvester. Measurement of the accuracy of the normal vector. In the results, the developed system could display the femoral Joint Surface and the normal vector for the femoral Joint Surface virtually. Also, the angle between the Surface normal vector and the real normal vector was an average of 6.50 degree. As a future work, the stereographic system using camera should be downsized.
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A development of navigation system for mosaic plasty using electromagnetic sensor
2011 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE 2011), 2011Co-Authors: Takayasu Toyoshima, Kouki Nagamune, Daisuke Araki, Tomoyuki Matsumoto, Seiji Kubo, Takehiko Matsushita, Ryosuke Kuroda, Masahiro KurosakaAbstract:Mosaic plasty is a surgery that transplant osteochondral grafts for osteochondritis dissecans. In mosaic plasty, cylindrical osteochondral grafts are harvested from normal area, and transplanted to injured area. The one of the most important thing of this surgery is that the graft should be perpendicular to the Surface of the cartilage. The navigation system that aims improvement of precision is already studied, however cannot be applied to use an endoscope. In addition, it is a problem to have bad precision of the transplant in the freehand. Therefore, we thought that the system would widely used if we develop the mosaic plasty navigation system under an endoscope. This study proposes a navigation system to determine a proper position and pose for harvesting. In the experiments, a femoral imitation bone is used as a profile of the femoral Joint Surface. The experiment consists of the following three procedures: Trace and display of the femoral Joint Surface profile and a harvester. Display of a normal vector for the femoral Joint Surface. Measurement of the deviation of the normal vector. In the results, the developed system could display the femoral Joint Surface and the normal vector for the femoral Joint Surface virtually. Also, the deviation of the normal vector was an average of 7.27 degrees. As future works, there are to decrease the deviation of the normal vector by improving the precision to acquire the femoral Joint Surface profile, and to visualize the normal vector for the generated Surface.
H. Song - One of the best experts on this subject based on the ideXlab platform.
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Modal Analysis of High-Speed Face Milling System Based on Composite Structure System Analysis Method
Materials Science Forum, 2014Co-Authors: H. SongAbstract:This paper adopts composite structure system analysis method to perform modal analysis of high-speed face milling cutter which is mounted on the machine tool through FEM modal analysis. The key problem of this method is to obtain Joint Surface parameters between the machine tool spindle and face milling cutter through experimental modal analysis and MATLAB software. The Joint Surface parameters consist of linear stiffness, linear damping, rotation stiffness and rotation damping. After getting the frequency response function (FRF) at the tool tip of the face milling system through experimental modal analysis, the contact Surface parameters can be used to eliminate the influence of the machine tool to get modal parameters of the face-milling cutter itself. Based on the finite element model of face milling cutter, composite structure system analysis method can be used easily to acquire the dynamic performance of the face milling system through FEM modal analysis, greatly to improve the reliability of modal analysis, and is helpful to the dynamic design and the structure improvement of high speed face milling cutter.
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Modal analysis of high-speed face milling system based on composite structure system analysis method
Materials Science Forum, 2014Co-Authors: L.n. Liu, Z. Y. Shi, Z. Q. Liu, H. SongAbstract:This paper adopts composite structure system analysis method to perform modal analysis of high-speed face milling cutter which is mounted on the machine tool through FEM modal analysis. The key problem of this method is to obtain Joint Surface parameters between the machine tool spindle and face milling cutter through experimental modal analysis and MATLAB software. The Joint Surface parameters consist of linear stiffness, linear damping, rotation stiffness and rotation damping. After getting the frequency response function (FRF) at the tool tip of the face milling system through experimental modal analysis, the contact Surface parameters can be used to eliminate the influence of the machine tool to get modal parameters of the face-milling cutter itself. Based on the finite element model of face milling cutter, composite structure system analysis method can be used easily to acquire the dynamic performance of the face milling system through FEM modal analysis, greatly to improve the reliability of modal analysis, and is helpful to the dynamic design and the structure improvement of high speed face milling cutter. © (2014) Trans Tech Publications, Switzerland.
Takayasu Toyoshima - One of the best experts on this subject based on the ideXlab platform.
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A development of navigation system with image segmentation in mosaicplasty of the knee
2012 IEEE International Conference on Fuzzy Systems, 2012Co-Authors: Takayasu Toyoshima, Kouki Nagamune, Daisuke Araki, Tomoyuki Matsumoto, Seiji Kubo, Takehiko Matsushita, Ryosuke Kuroda, Masahiro KurosakaAbstract:Mosaicplasty is a surgery that transplants osteochondral grafts for osteochondritis dissecans. In mosaicplasty, cylindrical osteochondral grafts are harvested from normal area, and transplanted to injured area. The one of the most important things of this surgery is that the graft should be perpendicular to the Surface of the cartilage. The navigation system that aims improvement of precision has been already studied, however cannot be applied to use an endoscope. In addition, it is a problem to have low precision of the transplant in the freehand. Therefore, we thought that the system would be widely used if we develop the mosaicplasty navigation system under an endoscope. This study proposes a navigation system to determine a proper position and pose for harvesting. In the experiments, a femoral imitation bone was used as a profile of the femoral Joint Surface. The experiment consists of the following three procedures: Scan and display of the femoral Joint Surface profile. Display of a normal vector for the femoral Joint Surface and a harvester. Measurement of the accuracy of the normal vector. In the results, the developed system could display the femoral Joint Surface and the normal vector for the femoral Joint Surface virtually. Also, the angle between the Surface normal vector and the real normal vector was an average of 6.50 degree. As a future work, the stereographic system using camera should be downsized.
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A development of navigation system for mosaic plasty using electromagnetic sensor
2011 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE 2011), 2011Co-Authors: Takayasu Toyoshima, Kouki Nagamune, Daisuke Araki, Tomoyuki Matsumoto, Seiji Kubo, Takehiko Matsushita, Ryosuke Kuroda, Masahiro KurosakaAbstract:Mosaic plasty is a surgery that transplant osteochondral grafts for osteochondritis dissecans. In mosaic plasty, cylindrical osteochondral grafts are harvested from normal area, and transplanted to injured area. The one of the most important thing of this surgery is that the graft should be perpendicular to the Surface of the cartilage. The navigation system that aims improvement of precision is already studied, however cannot be applied to use an endoscope. In addition, it is a problem to have bad precision of the transplant in the freehand. Therefore, we thought that the system would widely used if we develop the mosaic plasty navigation system under an endoscope. This study proposes a navigation system to determine a proper position and pose for harvesting. In the experiments, a femoral imitation bone is used as a profile of the femoral Joint Surface. The experiment consists of the following three procedures: Trace and display of the femoral Joint Surface profile and a harvester. Display of a normal vector for the femoral Joint Surface. Measurement of the deviation of the normal vector. In the results, the developed system could display the femoral Joint Surface and the normal vector for the femoral Joint Surface virtually. Also, the deviation of the normal vector was an average of 7.27 degrees. As future works, there are to decrease the deviation of the normal vector by improving the precision to acquire the femoral Joint Surface profile, and to visualize the normal vector for the generated Surface.
S J Chen - One of the best experts on this subject based on the ideXlab platform.
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characterization of anisotropy of Joint Surface roughness and aperture by variogram approach based on digital image processing technique
Rock Mechanics and Rock Engineering, 2016Co-Authors: S J Chen, Qinglei YuAbstract:The mechanical and hydraulic anisotropy of rock Joints are strongly dependent on the Surface roughness and aperture. To date, accurate quantification of the anisotropic characteristics of Joint Surfaces remains a key issue. For this purpose, the digital image processing (DIP) technique was used to retrieve the Joint Surface topography, and a variogram function was used to characterize the anisotropy of the Joint Surface roughness and estimate the Joint aperture. A new index, SRV, related to both the sill and the range of the variogram is proposed to describe the anisotropy of the Joint Surface roughness, and a new aperture index, b, is derived to quantify the Joint aperture. These newly proposed indexes, SRV and b, were validated by characterizing three artificial triangular Joint Surfaces, then the values of both SRV and b were calculated along 42 directions on an artificial Joint Surface. The range of SRV was between 0.058622 and 0.331283, while that of b was from 0.270433 to 0.397715 mm. The results show that the newly proposed indexes SRV and b are effective for quantifying the anisotropic roughness and aperture of Joint Surfaces, respectively. In addition, based on the hypothesis that there exists a smooth upper wall for the artificial Joint, a relationship between the indexes SRV and b was obtained based on the data analysis. It indicates that the trends of the indexes SRV and b tend to coincide, although some of their individual values differ. In this respect, the hydraulic aperture of rock Joints is related to not only Surface roughness but also the distribution of asperities on the Surface. In addition, this method can also be used to characterize the roughness of real rock Joints when the Joint Surface is treated by dying with ink before taking digital photos. This study provides a new method for properly quantifying the directional variability of Joint Surface roughness and estimating the mechanical and hydraulic properties of rock Joints based on the DIP technique.
Fan-hui Kong - One of the best experts on this subject based on the ideXlab platform.
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A Method for Reconstruction of Solder Joint Surface
2008 Fourth International Conference on Natural Computation, 2008Co-Authors: Fan-hui Kong, Guo-yan YangAbstract:Inspection of solder Joint is a critical step in the assembly of Printed Circuit Board (PCB) which requires high reliability. Non-destructive inspection technology based on image captured by Charge Couple Device (CCD) has been widely used in a production of PCB because of their excellent characters. This paper deals with the reconstruction of the solder Jointpsilas Surface in PCB based on shape form shading technology. Shape-from-shading (SFS) is an important non-contact measurement method that can be affected by the noise combined in image, so a Gaussian Smoothing filter is used pre-reconstruction. Nowadays, more and more researchers pay more attention to 3-D solder Joint inspection. In this paper, compared to other measurement methods, the advantages of SFS method are analyzed firstly. Then, theory of SFS method is introduced. To overcome the disadvantages existing in conventional SFS methods, some improved algorithms are provided and proved by experiments. Experimental results reveal that the proposed method shows practical value in solder Joint inspection.
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Reconstruction of Solder Joint Surface Based On Hybrid Shape from Shading
2008 Fourth International Conference on Natural Computation, 2008Co-Authors: Fan-hui KongAbstract:Inspection of solder Joint is a critical step in the assembly of printed circuit board (PCB) which requires high reliability. Shape-from-shading (SFS) is an important non-contact measurement method. However, the application of SFS for reconstruction of solder Joint Surface has yet to be fully investigated. In this paper, a algorithm of shape from shading based on hybrid reflection is proposed. Hybrid reflection models which containing diffuse reflectance and specular reflectance are used based on Tsai and Shash algorithm. For solder Joint inspection, the images contain specular reflectance component, one of the problems that hinders conventional methods for shape-from-shading is the presence of local specularities which may be misidentified as high curvature Surface features. Traditional shape from shading method directly used to reconstruct the Surface of solder Joint will obtain the result combined structural error, so considering the effect of specular reflectance will improve the precision. This paper summarize the existing method in hybrid reflection, selected a simple model Joint with Tsai and Shash algorithm in order to improve the quality of Surface normal information recoverable using shape-from-shading This paper discusses the flow of solder Joint inspection based on SFS. Experimental results reveal that the proposed method shows practical value in solder Joint inspection.
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Reconstruction of Solder Joint Surface Based on Shape from Shading
Third International Conference on Natural Computation (ICNC 2007), 2007Co-Authors: Fan-hui Kong, Yong-xin WangAbstract:Inspection of solder Joint is a critical step in the assembly of PCB (Printed Circuit Board) which requires high reliability. Previous studies have shown that a visual inspection is tedious and unreliable because the inspection process varies with the mood, time, experience and interpretation skills of an inspector. So, non-destructive inspection technology based on image captured by CCD (Charge Couple Device) has been widely used in a production of PCB because of their excellent characters. This paper deals with the reconstruction of the solder Joint's Surface in PCB based on shape form shading technology. Shape-from-shading (SFS) is an important non-contact measurement method that can be applied in the fields of remote sensing technology, industrial measurement, pattern recognition, product monitoring and micrograph measurement, etc. Therefore, more and more researchers pay more attention to this field recently. However, the application of SFS for reconstruction of solder Joint Surface has yet to be fully investigated. In this paper, compared to other measurement methods, the advantages of SFS method are analyzed firstly. Then, theory and survey of SFS method is introduced. To overcome the disadvantages existing in conventional SFS methods, some improved algorithms are provided and proved by experiments. This paper discusses the flow of solder Joint inspection based on SFS. Experimental results reveal that the proposed method shows practical value in solder Joint inspection.
