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( Jinoh Park ),( Hyun-sook Kim ),( Hye Jeon Hwang ),( Dong Hyun Yang ),( Hyun Jung Koo ),( Joon-won Kang ),( Young-hak Kim ) 대한내과학회 2017 The Korean Journal of Internal Medicine Vol.32 No.5
Background/Aims: To evaluate the geographic and demographic variabilities of the quantitative parameters of computed tomography perfusion (CTP) of the left ventricular (LV) myocardium in patients with normal coronary artery on com-puted tomography angiography (CTA). Methods: From a multicenter CTP registry of stress and static computed tomog-raphy, we retrospectively recruited 113 patients (mean age, 60 years; 57 men) with-out perfusion defect on visual assessment and minimal (< 20% of diameter steno-sis) or no coronary artery disease on CTA. Using semiautomatic analysis software, quantitative parameters of the LV myocardium, including the myocardial attenu-ation in stress and rest phases, transmural perfusion ratio (TPR), and myocardial perfusion reserve index (MPRI), were evaluated in 16 myocardial segments. Results: In the lateral wall of the LV myocardium, all quantitative parameters ex-cept for MPRI were significantly higher compared with those in the other walls. The MPRI showed consistent values in all myocardial walls (anterior to lateral wall: range, 25% to 27%; p = 0.401). At the basal level of the myocardium, all quan-titative parameters were significantly lower than those at the mid- and apical levels. Compared with men, women had significantly higher values of myocardial attenuation and TPR. Age, body mass index, and Framingham risk score were significantly associated with the difference in myocardial attenuation. Conclusions: Geographic and demographic variabilities of quantitative param-eters in stress myocardial CTP exist in healthy subjects without significant coro-nary artery disease. This information may be helpful when assessing myocardial perfusion defects in CTP.
Park Jongmin,Yoo Jinoh,Kim Taehyung,Ha Jong Moon,Youn Byeng D 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.4
Fault diagnosis of rolling element bearings (REBs), one type of essential mechanical element, has been actively researched; recent research has focused on the use of deep-learning-based approaches. However, conventional deep-learning-based fault-diagnosis approaches are vulnerable to various operating speeds, which greatly affect the vibration characteristics of the system studied. To solve this problem, previous deep-learning-based studies have usually been carried out by increasing the complexity of the model or diversifying the task of the model. Still, limitations remain because the reason of increasing complexity is unclear and the roles of multiple tasks are not well-defined. Therefore, this study proposes a multi-head de-noising autoencoder-based multi-task model for robust diagnosis of REBs under various speed conditions. The proposed model employs a multi-head de-noising autoencoder and multi-task learning strategy to robustly extract features under various speed conditions, while effectively disentangling the speed- and fault-related information. In this research, we evaluate the proposed method using the signals measured from bearing experiments under various speed conditions. The results of the evaluation study show that the proposed method outperformed conventional methods, especially when the training and test datasets have large discrepancies in their operating conditions.
Park, Jin Seo,Shin, Dong Sun,Chung, Min Suk,Hwang, Sung Bae,Chung, Jinoh WILEY-LISS, INC 2007 Clinical Anatomy Vol. No.
<P>This article describes the technique of semiautomatic surface reconstruction of anatomic structures using widely available commercial software. This technique would enable researchers to promptly and objectively perform surface reconstruction, creating three-dimensional anatomic images without any assistance from computer engineers. To develop the technique, we used data from the Visible Korean Human project, which produced digitalized photographic serial images of an entire cadaver. We selected 114 anatomic structures (skin [1], bones [32], knee joint structures [7], muscles [60], arteries [7], and nerves [7]) from the 976 anatomic images which were generated from the left lower limb of the cadaver. Using Adobe Photoshop, the selected anatomic structures in each serial image were outlined, creating a segmented image. The Photoshop files were then converted into Adobe Illustrator files to prepare isolated segmented images, so that the contours of the structure could be viewed independent of the surrounding anatomy. Using Alias Maya, these isolated segmented images were then stacked to construct a contour image. Gaps between the contour lines were filled with surfaces, and three-dimensional surface reconstruction could be visualized with Rhinoceros. Surface imperfections were then corrected to complete the three-dimensional images in Alias Maya. We believe that the three-dimensional anatomic images created by these methods will have widespread application in both medical education and research. Clin. Anat. 20:871–879, 2007. © 2007 Wiley-Liss, Inc.</P>
복잡한 동작에 강건한 모터 전류 신호 분석 기반 산업용 로봇 고장 감지 기법
유진오(Jinoh Yoo),박종민(Jongmin Park),하종문(Jong M. Ha),윤병동(Byeng D. Youn) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Industrial robots are essential equipment performing various roles throughout the entire line in an automated factory. Thus, the unexpected failure of the industrial robot leads to downtime and economic loss. Therefore, many fault detection approaches for industrial robots have been researched. Among these approaches, due to their cheap and non-invasive advantages, studies based on motor current signature analysis(MCSA) receive considerable attention in recent years. However, previous studies dealt with relatively simple motion profiles, which are hard to describe the complex motion profiles used in real industrial sites. In this paper, we propose the fault detection approach robust to complex motion profiles based on MCSA. The features related to signal oscillation and modulation caused by the fault condition are extracted in the current signals. The performance of the given approach is validated by using a 6-DOF industrial robot with normal and faulty conditions, where a fault reducer is located at the 4<SUP>th</SUP> joint.
박지영(Park, Jiyoung),김진오(Kim, Jinoh),여화선(Yeo, hwasun) 한국디자인지식학회 2014 디자인지식저널 Vol.31 No.-
본 연구는 보행자의 시야를 차단하거나 보행에 불편함을 주는 보행지장물의 개선에 따라 보행서비스수준의 개선 가능성을 고찰하고 있다. 이를 위해, 하루 평균 20만명 이상의 유동인구가 분포하는 강남대로 약 139m 구간을 연구대상지로 선정했다. 현장조사, 기존 자료조사, 보행서비스수준(PLOS) 분석 등을 기반으로 해서, 강남대로의 보행서비스수준을 저하시키는 요인인 보행지장물을 개선함으로써 보행서비스수준 개선 가능성을 고찰했다. 그 결과, 다음과 같은 결론을 도출했다. 첫째, 강남대로 약 139m구간의 보행교통류율은 83.33으로 보행자가 보행속도를 임의대로 선택할 수 없고, 다른 보행자를 추월, 역행, 통과하기 어렵다. 둘째, 강남대로의 상황에 맞게 적정 보도 폭을 산정하면 적정 보도 폭은 12.5m로 현 강남대로의 보도 폭이 5m인 것을 감안할 때 강남대로의 보도 폭이 좁은 것을 알 수 있었다. 셋째, 강남대로의 통행을 방해하는 보행지장물을 개선하고 개선 후 보행자 서비스수준을 알아보기 위해, 개선을 예측하여 보행자 서비스수준을 산정하였다. 보행자 서비스수준을 산정한 결과, 결과 값은 62.52 이하로 보행자 서비스수준을 20.81 이상 개선 가능하였으며 보행지장물의 수종 대체로 보행자의 시야를 확보하였고, 강남대로의 보행환경을 개선할 수 있는 가능성을 제시하였다. This study reviews the possibility of improving pedestrian level of service according to the improvement of walking obstructions blocking the pedestrian"s view or causing inconvenience in walking. For this, a 139m interval of Gangnam-daero where an average floating population of over 200,000 is distributed was selected as the area for study. Based on site study, research on existing material, pedestrian level of service etc., the possibility of improving pedestrian service level by improving the walking obstructions acting as a factor of deteriorating the pedestrian service level of Gangnam-daero was reviewed. The following conclusions were reached. First, as the pedestrian flow rate in the 139M interval of Gangnam-daero is 83.33, a pedestrian cannot select the walking speed nor overtake and pass another pedestrian. Second, the appropriate sidewalk width calculated according to Gangnam-daero"s conditions was 12.5m; considering that the width at Gangnam-daero is 5m, we could see that the sidewalk there is narrow. Third, to improve the walking obstacles obstructing the walking at Gangnam-daero and identify the pedestrian service level after improvement, As a result, the value was below 62.52; therefore, the pedestrian service level can be improved by over 20.81, the pedestrian"s sight secured by replacing walking obstacles with new tree species and the possibility of improving the walking environment of Gangnam-daero was provided.