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Object Tracking and Elimination using Level-of-Detail Canny Edge Maps
Park, Jihun Research Institute of Science and Technology HONGI 2005 Hongik Journal of Science and Technology Vol.9 No.-
We propose a simple method for tracking a nonparameterized subject contour in a single video stream with a moving camera. Then we eliminate the tracked contour object by replacing the background scene we get from other frame that is not occluded by the tracked object. Our method consists of two parts: first we track the object using LOD (Level-of-Detail) canny edge maps, then we generate background of each image frame and replace the tracked object in a scene by a background image from other frame. In order to track a contour object, LOD Canny edge maps are generated by changing scale parameters for a given image. A simple (strong) Canny edge map has the smallest number of edge pixels while the most detailed Canny edge map, Wcanny_(N) , has the largest number of edge pixels. To reduce side-effects because of irrelevant edges, we start our basic tracking by using simple (strong) Canny edges generated from large image intensity gradients of an input image, called Scanny edges. Starting from Scanny edges, we get more edge pixels ranging from simple Canny edge maps until the most detailed (weaker) Canny edge maps, called Wcanny maps along LOD hierarchy. LOD Canny edge pixels become nodes in routing, and LOD values of adjacent edge pixels determine routing costs between the nodes. We find the best route to follow Canny edge pixels favoring stronger Canny edge pixels. The first frame background scene is determined by camera motion, and other background scenes are computed from the previous background scenes.
Park, Jihun,Kim, Joohee,Kim, Kukjoo,Kim, So-Yun,Cheong, Woon Hyung,Park, Kyeongmin,Song, Joo Hyeb,Namgoong, GyeongHo,Kim, Jae Joon,Heo, Jaeyeong,Bien, Franklin,Park, Jang-Ung The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.20
<P>Herein, we report the fabrication of a highly stretchable, transparent gas sensor based on silver nanowire-graphene hybrid nanostructures. Due to its superb mechanical and optical characteristics, the fabricated sensor demonstrates outstanding and stable performances even under extreme mechanical deformation (stable until 20% of strain). The integration of a Bluetooth system or an inductive antenna enables the wireless operation of the sensor. In addition, the mechanical robustness of the materials allows the device to be transferred onto various nonplanar substrates, including a watch, a bicycle light, and the leaves of live plants, thereby achieving next-generation sensing electronics for the 'Internet of Things' area.</P>
Jihun Jang,박지혜,Park Soo Jung,Park Jae Jun,천재희,김태일 대한장연구학회 2023 Intestinal Research Vol.21 No.4
Background/Aims: Patients with more than 10 cumulative polyps might involve a greater genetic risk of colorectal neoplasia development. However, few studies have investigated the risk factors of polyposis recurrence and development of advanced neoplasms among patients with non-hereditary colorectal polyposis.Methods: This study included patients (n=855) with 10 or more cumulative polyps diagnosed at Severance Hospital from January 2012 to September 2021. Patients with known genetic mutations related to polyposis, known hereditary polyposis syndromes, insufficient information, total colectomy, and less than 3 years of follow-up were excluded. Finally, 169 patients were included for analysis. We collected clinical data, including colonoscopy surveillance results, and performed Cox regression analyses of risk factors for polyposis recurrence and advanced neoplasm development.Results: The 169 patients were predominantly male (84.02%), with a mean age of 64.19±9.92 years. The mean number of adenomas on index colonoscopy was 15.33±8.47. Multivariable analysis revealed history of cancer except colon cancer (hazard ratio [HR], 2.23; 95% confidence interval [CI], 1.23–4.01), current smoking (HR, 2.39; 95% CI, 1.17–4.87), and detection of many polyps (≥15) on index colonoscopy (HR, 2.05; 95% CI, 1.21–3.50) were significant risk factors for recurrence of polyposis. We found no statistically significant risk factors for advanced neoplasm development during surveillance among our cohort.Conclusions: The presence of many polyps (≥15) on index colonoscopy, history of cancer except colon cancer, and current smoking state were significant risk factors for polyposis recurrence among patients with non-hereditary colorectal polyposis.
The GOMS and Keystroke-level Model for User Performance Time with vi Editor
Park,Jihun 부산외국어대학교 1991 外大論叢 Vol.9 No.2
이 논문은 vi editor에 대한 GOMS 및 Keystroke-level에 대한 model을 다룬다. 원래의 vi editor와 SpaceBall이 연결된 vi editor가 서로 비교 및 분석되었다. 이 논문에서는 vi editor에 대한 GOMS model을 하였고, 분석의 결과로서 SpaceBall이 연결된 vi editor가 원래의 vi editor 보다 성능이 떨어지는 것이 판명되었다. This report deals with GOMS and keystroke-level model for user performance time with vieditors. Pure vi editor and vi editor interfaced with SpaceBall are compared and analyzed. Also GOMS model for each vi editor is provided. As a result of analysis, vi editor interfaced with Space Ball is not better than pure vi editor.
Log-canonical thresholds on del Pezzo surfaces of degrees ≥ 2
Park, Jihun,Won, Joonyeong Cambridge University Press 2010 Nagoya mathematical journal Vol.200 No.-
<B>Abstract</B><P>We compute the global log-canonical thresholds (lct) of del Pezzo surfaces of degrees ≥ 2 with du Val singularities.</P>
Jihun Park,Minkyung Kim,Jae-Eun Hyun 한국예방수의학회 2024 예방수의학회지 Vol.48 No.1
An ameroid constrictor (AC) was placed to occlude the shunt vessel in a dog diagnosed with a single extrahepatic portocaval shunt, and the patient showed favorable outcomes post-surgery. However, the 1-year postoperative assessment revealed that the shunt vessel was completely occluded, but the AC had migrated into the abdominal cavity. The examination of the surgically removed migrated AC revealed an internal space filled with fibrous tissues with no swelling in the casein, and notably, the key remained securely in place. This is the first veterinary medicine case in which migration of the AC without dislodgement of ameroid key was identified.