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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.
Jihun Kang(Jihun Kang),Taeyun Kim(Taeyun Kim),Kyung-Do Han(Kyung-Do Han),Jin-Hyung Jung(Jin-Hyung Jung),Su-Min Jeong(Su-Min Jeong),Yo Hwan Yeo(Yo Hwan Yeo),Kyuwon Jung(Kyuwon Jung),Hyun Lee(Hyun Lee) 한국역학회 2023 Epidemiology and Health Vol.45 No.-
OBJECTIVES: We examined the associations of socioeconomic factors, health behaviors, and comorbidities with early-onset lung cancer. METHODS: The study included 6,794,287 individuals aged 20-39 years who participated in a Korean national health check-up program from 2009 to 2012. During the follow-up period, 4,684 participants developed lung cancer. Multivariable Cox regression analysis was used to estimate the independent associations of potential risk factors with incident lung cancer. RESULTS: Older age (multivariable hazard ratio [mHR], 1.13; 95% confidence interval [CI], 1.12 to 1.14) and female sex (mHR, 1.62; 95% CI, 1.49 to 1.75) were associated with increased lung cancer risk. Current smoking was also associated with elevated risk (<10 pack-years: mHR, 1.12; 95% CI, 1.01 to 1.24; ≥10 pack-years: mHR, 1.30; 95% CI, 1.18 to 1.45), but past smoking was not. Although mild alcohol consumption (<10 g/day) was associated with lower lung cancer risk (mHR, 0.92; 95% CI, 0.86 to 0.99), heavier alcohol consumption (≥10 g/day) was not. Higher income (highest vs. lowest quartile: mHR, 0.86; 95% CI, 0.78 to 0.94), physical activity for at least 1,500 metabolic equivalent of task-min/wk (vs. non-exercisers: mHR, 0.83; 95% CI, 0.69 to 0.99) and obesity (vs. normal weight: mHR, 0.89; 95% CI, 0.83 to 0.96) were associated with lower lung cancer risk, whereas metabolic syndrome was associated with increased risk (mHR, 1.13; 95% CI, 1.03 to 1.24). CONCLUSIONS: In young adults, age, female sex, smoking, and metabolic syndrome were risk factors for early-onset lung cancer, while high income, physical activity, and obesity displayed protective effects.
Jihun Oh,Jaewoo Yang,Jungmin Yang,Minsoo Kang,Sukyoung Kim,Minjun Lee,Jinwoong Lim 대한침구의학회 2023 대한침구의학회지 Vol.40 No.3
Laryngopharyngeal reflux (LPR) disease is a condition in which the stomach contents return to the larynx and pharynx via the esophagus, causing mucosal injury. While conventional treatments, such as proton pump inhibitors, have limitations, acupuncture has been shown to reduce LPR symptoms. However, its effectiveness has not been systematically assessed. This study aimed to systematically evaluate the effectiveness of acupuncture in treating LPR. We review 10 electronic databases with a consistent search strategy, and 2 independent reviewers screened the articles based on the inclusion and exclusion criteria. This study selected and analyzed 7 randomized controlled trials after the screening to assess primary outcomes, including reflux symptom index and reflux finding score, and secondary outcomes, including upper and lower esophageal sphincter pressure. The results revealed the statistically significant effectiveness of acupuncture in combination with conventional treatment in reducing LPR symptoms compared with conventional treatment alone. The most commonly used acupuncture points were CV22, ST36, and LR3. However, the meta-analysis demonstrated low reliability, as assessed using the GRADE Tool. Further research is needed to improve the evidence and draw clear conclusions regarding the clinical use of acupuncture for treating LPR.
Jihun Kang,Young-Shik Yun,Eun-Hye Kang,In-Sik Yun,Jong-Souk Yeo 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Cellular traction forces (CTFs) are essential factors for various cell behaviors. However, previous studies have not completely identified the relationships between cellular traction forces and cell behaviors. Herein, human adipose-derived stem cells (hASCs) were cultured on polyurethane (PUA) nanopillars, and their interactions were observed with a scanning electron microscopy. With the analyses, the individual force of spring-like actomyosin was characterized by calculating CTFs on each nanopillar. Then, the relationships between the forces of actomyosin and cellular behaviors were proposed.
Jihun Park,Jae-Nam Lee,Lee, One-Ki Daniel,Yunmo Koo IEEE 2017 IEEE TRANSACTIONS ON ENGINEERING MANAGEMENT - Vol.64 No.3
<P>Only a few firms possess all of the information technology (IT) resources required to compete effectively in today's dynamic business environment. Consequently, firms face critical challenges in developing their IT governance by integrating, building, and reconfiguring IT resources available internally and externally to achieve a competitive advantage. However, prior studies have mostly examined IT governance only from an internal (e.g., IT organization design) or external (e.g., IT outsourcing) perspective. Therefore, how the internal and external IT governance of firms simultaneously lead to firmperformance remains unclear. To address this research gap, we conceptualize internal and external IT governance from the extended resource-based view, propose three alignments between both types of governance, and hypothesize their effects on distinctive firm performance. We then empirically test these hypotheses using 213 Korean firms that have implemented IT outsourcing. Results show that a hierarchy-based alignment (i.e., between internal and external hierarchy governance) optimizes the operational efficiency of firms, a market-based alignment (i.e., between internal and external market governance) offers the greatest advantage in terms of market growth, and a network-based alignment (i.e., between internal and external network governance) leads to the best innovation performance. Furthermore, our post hoc test also reveals some unexpected alignments (e.g., between internal market and external hierarchy governance) that positively influence firm performance, which call for new areas of discussion with alternative theoretical perspectives. This study guides practitioners in choosing outsourcing alignments by comprehensively analyzing the effects of various alignments on distinctive outcomes.</P>