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Infected Part Detection based on Affinity Propagation Clustering
Naser S. A. Abusulaiman,Wesam M Ashour 보안공학연구지원센터 2016 International Journal of Software Engineering and Vol.10 No.7
Manual identification of defected objects consumes time and effort. These leading researchers try to find out an automatic infected objects detection systems to reduce these denigrate issues, which affects trade business fields, as an example, infected fruits or vegetables in agricultural field. This paper presents an image segmentation method based on affinity propagation (AP) clustering algorithm for detecting infected part in fruits or vegetables. Results show that this methodology is good comparing to K-means algorithm, which gives good results. Nevertheless, AP outperforms that does not need pre-specify cluster number, which is needed in K-means. Some deficiencies occur when using traditional AP, but using sparse version of AP overcomes most of these deficiencies. Extra feature of AP that it works better than K-means as cluster number is increasing or complexity of infected objects is amplifying. AP works better than K-means in widespread and various sized defected regions. Another contribution in this paper, choosing adequate color space provides preferable results. Experimental results clarify that NTSC or YCbCr color space are more stable to act as image color space since they enhance Silhouette values rhythmically. However, methodology presented in this paper needs to collaborate with other image techniques, as indexed color techniques and lossless compression methods, to overcome operation speed problem. In addition, more enhancements are anticipated when using adaptive AP, as it introduces solutions through adaptive damping, adaptive preference scanning and adaptive escaping oscillations.
Selective production of propylene from methanol over nanosheets of metal-substituted MFI zeolites
Naser Hadi,Reza Alizadeh,Aligholi Niaei 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
The nanosheets of M-substituted (M: Mn, Ce, W) MFI zeolites were successfully synthesized via hydrothermal method. The catalysts were satisfactorily characterized by different techniques and the well synthesized nanostructures were approved. The prepared catalysts were examined in methanol to propylene process and showed improved performance compared to the conventional H-ZSM-5. The Wsubstituted MFI nanosheets productively represented the best performance with complete methanol conversion, propylene selectivity of 55.70%, total selectivity to light olefins of 88.04% and catalytic lifetime of 81 h. Furthermore, TGA and BET analyses were conducted to characterize the coke deposition. The lowest coke was detected on W-substituted MFI nanosheets.
Marginal bone loss around crestal or subcrestal dental implants: prospective clinical study
Naser Sargolzaie,Hosein Hoseini Zarch,Hamidreza Arab,Tahereh Koohestani,Mahdiye Fasihi Ramandi 대한구강악안면외과학회 2022 대한구강악안면외과학회지 Vol.48 No.3
Objectives: The stability of crestal bone has been reported as a major factor in the success of dental implants. Implants can be placed in an equicrestal (crestal) or subcrestal position. The aim of this study was to evaluate the effect of implant depth placement on marginal bone loss. Materials and Methods: The study was created in a split-mouth design. Immediately after implant surgery, digital parallel radiographs were prepared and levels of bone were measured where marginal bone loss and bone level changes occurred. These measurements were repeated at 3-month and 6-month follow-up periods. Results: In this interventional study, 49 implants were evaluated in 18 patients. Primary bone height was not significant between the intervention and control groups in both mesial and distal aspects at 3 months and 6 months from the baseline. The mean marginal bone loss on the mesial side was 1.03 mm in the subcrestal group and 0.83 mm in the crestal group. In addition, mean marginal bone loss on the distal side was 0.88 mm and 0.81 mm in the subcrestal and crestal groups, respectively. Marginal bone loss was not significantly different between sexes, the maxilla or mandible, and in the anterior or posterior regions as well as between different lengths and diameters of implants. Conclusion: Based on the results of this study, there was no significant difference in terms of marginal bone loss between crestal and subcrestal implants.