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모바일 플랫폼을 이용한 영상·열화상 기반 설비 이상징후 진단 및 예측기법 개발
서준영(Junyoung Seo),문영민(Youngmin Moon),류황열(Hwangryol Ryu),유기성(Kisung Yoo) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
There have been a lot of studies in the past for the method of predicting the failure of a machine, and recently, a lot of researches and applications have been generated to diagnose the physical condition of the machine and the parts and to calculate the remaining life through various methods. Survival models are also used to predict plant failures based on past anomaly cycles. In this paper, we developed a rail-driven mobile system that diagnoses machine abnormalities by receiving machine information from images and thermal images of targets with limited operator access and inspection or requiring long-term monitoring in a wide area. This anomaly diagnosis model uses a 2D temperature array (temperature map) and a motion vector array (motion map) as inputs data of the Wasserstein GAN (wGAN) learning model trained with normal data. Because the difference between the input and output is used as a global loss function (global), the anomaly score is calculated and the condition of the machine is diagnosed according change of anomaly score. This rail-driven mobile system is expected to make a great contribution to equipment maintenance and optimal operation because it provides quantitative evidence to monitor equipment in the long term to diagnose failures early and give maintenance instructions.
스텐트 플렌지 유발 식도 협착을 경구 스테로이드를 이용하여 치료한 예
서준영 ( Junyoung Seo ),박주상 ( Ju Sang Park ) 대한내과학회 2021 대한내과학회지 Vol.96 No.4
Esophageal stent complications include stent migration, tumor ingrowth, perforation, a broncho-esophageal fistula, and gastroesophageal reflux. Development of a new stricture at a flange site after stent removal has been predicted but not yet reported. We experienced the first case of a recurrent esophageal stricture induced by a stent flange after stent removal. A fully covered metallic stent, which had been inserted 2 months ago for treatment of an anastomotic stricture, triggered another stricture at the flange site. Although endoscopic balloon dilatations were repeated several times and then the 2nd stent for rescue therapy was inserted, the stricture was refractory to all treatment. Thus, we prescribed oral prednisolone with repeated endoscopic balloon dilation; the stricture eventually improved. The oral steroid seemed to suppress stricture development. If a stent flange-induced refractory stricture is encountered, an oral steroid combined with endoscopic balloon dilation may be helpful. (Korean J Med 2021;96:352-357)
양병곤(Byunggon Yang),서준영(Junyoung Seo) 한국음성학회 2007 음성과학 Vol.14 No.3
This paper examined the intonation contours of English sentences produced by the Korean students. Thirty students participated in the speaking tasks made up of three parts: an oral interview, picture description and a conversational text reading. Their pronunciations in the parts were recorded on a minidisk. Then, two native instructors evaluated their proficiency level focusing on general intelligibility and suprasegmental aspects of the speech. Based on the results of evaluation they were divided into two groups: high and low proficiency groups. The pitch contours of three sentences produced by both the Korean students and a native speaker were compared to find any similarities and differences in the students’ intonation patterns using Praat. Results showed that there was a moderate correlation in the proficiency scores of the students by the two native speakers. Secondly, students who earned high scores in the proficiency level matched better the native model. Thirdly, the high group students knew more on the pitch contour and tried to carefully realize them while fewer students in the low group answered positively on the questionnaire. In conclusion, English learners need to know the proper intonation patterns and to practice them consciously and sufficiently to realize correct intonation contours. Further studies would be desirable on the students’ pronunciation focused on discourse structure.