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Higuchi, Tatsuo,Kawamata, Masayuki,Abe, Masahide 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
This paper proposes evolutionary digital filters as a new concept for adaptive digital filters. Evolutionary digital filters are adaptive filters which are controlled by adaptive algorithm based on the evolutionary strategies of organisms. An evolutionary digital filter consists of many linear but time-variant inner digital filters which correspond to organisms. The output of the evolutionary digital filter is the output of an inner filter of which fitness is maximum at every iteration. The adaptive algorithm controls and changes the coefficients of inner filters using asexual reproduction method or sexual reproduction method. The adaptive algorithm is inherently parallel because of the natural independence of evolutionary operations. An example for interference canceling shows the effectiveness of evolutionary digital filters.
A Fast and Efficient Blotch Detection Algorithm for Degraded Image Sequences Based on MRF Models
Sang-Churl Nam,Masahide Abe,Masayuki Kawamata 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper proposes an efficient blotch detection algorithm based on a Markov Random Field (MRF) model with less computational complexity and with lower false alarm rate than the existing MRF-based algorithms. The proposed algorithm can save the computational time for detecting the blotches by restricting the attention of the detection process only to the candidate areas. To solve the problem of confusion with the blotches in the vicinity of the moving object, we incorporate the weighting function with respect to the detected moving edge pixels into the formuation. Experimental result shows that our method can provides the computational simplicity and an efficient detecting performance for the blotches.
Novel condylar repositioning method for 3D-printed models
Sugahara, Keisuke,Katsumi, Yoshiharu,Koyachi, Masahide,Koyama, Yu,Matsunaga, Satoru,Odaka, Kento,Abe, Shinichi,Takano, Masayuki,Katakura, Akira Korean Association of Maxillofacial Plastic and Re 2018 Maxillofacial Plastic Reconstructive Surgery Vol.40 No.-
Background: Along with the advances in technology of three-dimensional (3D) printer, it became a possible to make more precise patient-specific 3D model in the various fields including oral and maxillofacial surgery. When creating 3D models of the mandible and maxilla, it is easier to make a single unit with a fused temporomandibular joint, though this results in poor operability of the model. However, while models created with a separate mandible and maxilla have operability, it can be difficult to fully restore the position of the condylar after simulation. The purpose of this study is to introduce and asses the novel condylar repositioning method in 3D model preoperational simulation. Methods: Our novel condylar repositioning method is simple to apply two irregularities in 3D models. Three oral surgeons measured and evaluated one linear distance and two angles in 3D models. Results: This study included two patients who underwent sagittal split ramus osteotomy (SSRO) and two benign tumor patients who underwent segmental mandibulectomy and immediate reconstruction. For each SSRO case, the mandibular condyles were designed to be convex and the glenoid cavities were designed to be concave. For the benign tumor cases, the margins on the resection side, including the joint portions, were designed to be convex, and the resection margin was designed to be concave. The distance from the mandibular ramus to the tip of the maxillary canine, the angle created by joining the inferior edge of the orbit to the tip of the maxillary canine and the ramus, the angle created by the lines from the base of the mentum to the endpoint of the condyle, and the angle between the most lateral point of the condyle and the most medial point of the condyle were measured before and after simulations. Near-complete matches were observed for all items measured before and after model simulations of surgery in all jaw deformity and reconstruction cases. Conclusions: We demonstrated that 3D models manufactured using our method can be applied to simulations and fully restore the position of the condyle without the need for special devices.