• Journal of Broadcast Engineering
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• v.27 no.1
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• pp.20-30
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• 2022

Recently, as VR (Virtual Reality) technology has been in the spotlight, 360° panoramic images that can view lively VR contents are attracting a lot of attention. Image stitching technology is a major technology for producing 360° panorama images, and many studies are being actively conducted. Typical stitching algorithms are based on feature point-based image stitching. However, conventional feature point-based image stitching methods have a problem that stitching results are intensely affected by feature points. To solve this problem, deep learning-based image stitching technologies have recently been studied, but there are still many problems when there are few overlapping areas between images or large parallax. In addition, there is a limit to complete supervised learning because labeled ground-truth panorama images cannot be obtained in a real environment. Therefore, we produced three fisheye images with different camera centers and corresponding ground truth image through carla simulator that is widely used in the autonomous driving field. We propose image stitching model that creates a 360° panorama image with the produced fisheye image. The final experimental results are virtual datasets configured similar to the actual environment, verifying stitching results that are strong against various environments and large parallax.

• The Journal of the Korea Contents Association
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• v.18 no.7
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• pp.412-422
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• 2018

The purpose of this research was to compare structural organization of North Korean English textbooks pre and post North Korean 2013 curriculum revision. 5 revised textbooks were selected and compared with old textbooks. First, revised textbooks are dramatically changed into colored printed edition. Second, there appears phrases related to Kim Jong Un for the very first time in the preface. Third, while old textbooks emphasized only reading and writing skills, new textbooks integrate 4 skills. Fourth, new textbooks follow united organization system according to the kinds of school; 7 sub skills of Reading, Listening, Speaking, Writing, Grammar, Vocabulary, Pronunciation for general high middle textbooks and 5 sub skills of Listening, Speaking, Reading, Writing, English in Use for the first high middle textbooks. Also, new textbooks integrate English and other subject contents such as science, geography or computer. Finally, the changed structure organization of new textbooks seems to be similar with the ones of English books in the reference which is presented for the first time in North Korean textbooks.

• Journal of Practical Agriculture & Fisheries Research
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• v.7 no.1
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• pp.90-96
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• 2005

Tubers(4-5cm diameter) of Zantedeschia 'Black Magic' were used to study the induction of flowering in GA₃ soaking times and concentration. The GA₃ soaking were 10 seconds and 30 minutes at the GA₃ concentrations of 50, 100, 250, and 500 mg·L¹. The time to emergence in GA₃ treatment were 1.1~4.0 days shorter than control Growth characteristics were good in GA₃ treatment but that was no significance in GA₃ soaking time and concentration. When GA₃ soaking time and concentration were increased, days to flowering was shorter, but flower stalk length, flower stalk width, flower length, flower width were no difference. The number of flower per tuber was most as 4.0~4.3 in 250~500 mg·L¹ GA₃ concentration and that was about 2 times compared to control. The normal flower ratio and bulb enlargement were similar compared with GA₃ soaking time and concentration. GA₃ 250~500 mg·L¹ treatment is necessary for improvement of number of flowers per bulb.