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Development of a Real-time Measurement Program on the Size of Plum (Prunus mume) by 3D Images
( Gyeong Jang ),( Tangina Akhter ),( Seong-jin Park ),( Mohammod Ali ),( Gwang-sim Kim ),( Jaeyoon Cha ),( Hoon Seonwoo ),( Yeong-hwan Bae ),( Hyuck-joo Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Plums (prunus mumes) are known as an effective healthy food. Thereby, their domestic demands increased gradually, and the industry related to plum processing is also expanding. In order to improve the quality of plums and to reduce losses in production, it should be sure to avoid them to Eurytomidae, the most damaging insect. However, it is difficult to distinguish infection with the naked eye, since the larvae of Eurytomidae are inside the nucleus of the plums. Therefore, prevention of them with a remote diagnostic system to monitor the size of plums by growth stages is required. In this study, a program to measure plum sizes through 3D images was developed to improve the ability to predict optimum timing for extermination. The experiment used the Xbox Kinect 2.0 sensor, allowing simultaneous measurement of color image and depth information. To identify the plums in images obtained by Kinect 2.0 camera. Because plum shape is round, we used the imfindcircles function, which is implemented in MATLAB R2017b for the circular hough transform. However, it is difficult to recognize plums by untreated images. Hence, we adjust the sensitivity and edges of the algorithms. The edge detection algorithm was performed before circle-finding algorithm. In addition, we developed and performed algorithms using color information to remove non-fruit parts and leave green plums only. As a result, recognition success rate was 55.3% (26 Normal Recognition / All 47 objects), and error rate was 7.1% (2 recognitions error / All 28 recognition). By looking at the depth image and obtaining the depth information manually, the number of pixels corresponding to the diameter of the recognized object is multiplied by the spatial resolution per pixel. As a result, plum sizes were estimated with 9.2% error rate, limited to plums identified in color images. However, in order to collect real-time size information of plums in a field scan quickly, it is necessary to improve object recognition and the acquisition rate of depth information by complementing the imaging conditions, analysis algorithms, and algorithm designs to represent color images and depth images entered in Kinect 2.0 in the same coordinate system and Sensor Calibration. With Information and Communication Technology (ICT) convergence system, it is possible to establish optimum timing to control based on understanding the growth of plums and harmful insects. These attempt to graft ICT technologies into the agricultural sector to respond to changes of the 4th industrial revolution in the world is judged that it is possible to boost the competitiveness of Korean agriculture and to function as a catalyst for promoting fused research by combining engineering technology with pest ecology research to improve the productivity of fruit trees and horticulture.
Comparison of Hot-deformation Behavior and Magnetic Properties between Nd-Fe-B HDDR and MQU-F Powder
Jae-Gyeong Yoo,Hee-Ryoung Cha,Dong-Hwan Kim,Yang-Do Kim,Jung-Goo Lee 한국자기학회 2020 Journal of Magnetics Vol.25 No.1
Hot-deformation behavior of Nd-Fe-B HDDR powder was investigated in order to understand the difference in texturing mechanism of HDDR and MQU-F powder during hot-deformation. The composition of the HDDR powder was the same as that of MQU-F powder. However, the grain size of HDDR powder (~300 nm) was eight times larger than that of MQU-F powder (~40 nm). After being subjected to hot-pressing at 700 °C under 200 MPa in a vacuum, the grains of the magnets made from HDDR powder and MQU-F powder have globular and platelet shapes, respectively. The remanence was 12.2 kG after die-upsetting process at the strain of 0.5. And it increased up to 13 kG at the strain of 1.4 although the grains still maintained globular-like shapes. The remanence of 13 kG was almost the same as that obtained the magnet from MQU-F powder at the same deformation condition. These results indicate that the hot-deformation behavior is quite different between HDDR and MQU-F powder.