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AI를 활용한 스토리텔링 시스템에 대한 연구 – 유치원 생활기록 시스템 디자인을 중심으로
이건우(Kunwoo-Lee),박다솜(Dasom Park),반영환(Younghwan Pan) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.6
This study aims to study how to apply artificial intelligence technology to describe storytelling, which is the most natural form of sharing human experiences. In the kindergarten setting, teachers have to record childrens lives and share them with parents. However, many teachers usually have difficulty collecting and recording data that observe young children, and the shorter the teachers career is, the more difficult it is to write records. In this study, we propose a system that automatically creates storytelling in the form of a diary by combining and analyzing images entered through wearable cameras worn by kindergarten children using artificial intelligence technology. Based on this, it is expected that teachers will be able to improve their difficulties and provide a satisfactory service by delivering accurate information about their childs kindergarten life to parents.
SLA를 이용한 신속시작작업을 위한 지지대 자동생성 시스템의 개발
허정훈,이건우,Hur, Junghoon,Lee, Kunwoo 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
stereolithography is a process used to rapidly produce polymer components directly from a computer representation of the part. There are several considerations to be made for the efficient use of the process. Especially, the necessity of support structures, which prevent the part from warping, sagging, or parachuting and toppling as the elevator moves up and down in the resin, is one concern. After solidification, the support structures must by removed in the end. Bacause this post-treatment process is often performed manually, the more the support structures, the more it increases the finishing operations. Especially for a complicated part, the removal operations may be difficult, take so much time, and even reduce the accuracy of the product. Thus it is important to efficiently generate the efficient support structure for each part geometry. This paper proposes a procedure to automatically generate the supprot structures focused on accuracy, efficiency, convenience, and generation speed.
Initial closed curve for active contour model on mesh
JuSung Lee(이주성),JeongHun Lim(임정훈),Kunwoo Lee(이건우) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
The accurate margin line extraction is a crucial process in computer-aided orthodontics. Margin line is boundary line of treatment region. Though curvature field is traditionally used for detect feature line, different shapes and scanning noises make hard to detect margin line automatically. Thus current dental CAD systems mostly require the user interactive definition of points by the user. So, we also use interactive defined starting points by the user. In medical image processing, active contour model is used to extract feature line. However it doesn’t work when initial curve is improper. To solve this problem, this paper proposes a novel closed curve initialization algorithm that makes initial curve on mesh by using starting points. Some experiments show our initialization method is robust and fast.
인솔 설계 변수에 따른 발목 과-회내 환자의 보행 시 좌우 방향 무릎 관절 하중의 변화
이상준(SangJun Lee),백승엽(Seung-Yeob Baek),손진규(JinKyou Son),김동욱(Dongwook Kim),이건우(Kunwoo Lee) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
The over-pronation of the knee joint causes the mechanical overloading transferred to proximal areas (i.e. ankles, knees, or hips) over time. Thus, the over-pronation is recognized as a contributory factor in a wide variety of musculo-skeletal pathologies in lower extremities. Commonly, over-pronated ankles are treated using specially designed insoles that support medial heels and correct the posture of lower limbs. However, the biomechanical effects of the insoles are not yet fully understood, so there still are controversies whether such insoles really have clinical significance. In this study, in order to verify the effects of insoles and determine the best shape of the insoles, we examined how the medio-lateral knee joint reaction force changes due to insole conditions. As shape parameters of insoles, the medio-lateral heel post angle and the arch support height were chosen. We then collected marker trajectories and ground reaction forces and moments of one male subject with overpronation walking with different insole conditions. The OpenSim software was employed for the simulation of each trial. Finally, the medio-lateral knee joint reaction force curves of each trial were plotted, and the efficacy of each insole condition was evaluated by comparing their peak values. As a result, it is revealed that the medial heel post, which drastically reduced the peak medio-lateral knee joint reaction force, has significant effects on the gait of the over-pronated patients. However, in case that the arch support is combined together, the positive effect of the medial heel post may rather decrease.
이주성(Jusung Lee),백승엽(Seung-Yeob Baek),이건우(Kunwoo Lee) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
Medical image acquisition techniques such as CT and MRI have disadvantages in that the numerous time and efforts are needed. Furthermore, a great amount of radiation exposure is an inherent proberty of the CT imaging technique, a number of side-effects are expected from such method. To improve such conventional methods, a number of novel methods that can obtain 3D medical images from a few X-ray images, such as algebraic reconstruction technique (ART), have been developed. Such methods deform a generic model of the internal body part and fit them into the X-ray images to obtain the 3D model; the initial shape, therefore, affects the entire fitting process in a great deal. From this fact, we propose a novel method that can generate a 3D vertebraic generic model based on the statistical database of CT scans in this study. Moreover, we also discuss a method to generate patient-tailored generic model using the facts obtained from the statistical analysis. To do so, the mesh topologies of CTscanned 3D vertebra models are modified to be identical to each other, and the database is constructed based on them. Furthermore, from the results of a statistical analysis on the database, the tendency of shape distribution is characterized, and the modeling parameters are extracted. By using these modeling parameters for generating the patient-tailored generic model, the computational speed and accuracy of ART can greatly be improved. Furthermore, although this study only includes an application to the C1 (Atlas) vertebra, the entire framework of our method can be applied to other body parts generally. Therefore, it is expected that the proposed method can benefit the various medical imaging applications.
이주성(Jusung Lee),백승엽(Seung-Yeob Baek),이건우(Kunwoo Lee) (사)한국CDE학회 2010 한국CDE학회 논문집 Vol.15 No.4
Medical image acquisition techniques such as CT and MRI have disadvantages in that the numerous time and efforts are needed. Furthermore, a great amount of radiation exposure is an inherent proberty of the CT imaging technique, a number of side-effects are expected from such method. To improve such conventional methods, a number of novel methods that can obtain 3D medical images from a few X-ray images, such as algebraic reconstruction technique (ART), have been developed. Such methods deform a generic model of the internal body part and fit them into the X-ray images to obtain the 3D model; the initial shape, therefore, affects the entire fitting process in a great deal. From this fact, we propose a novel method that can generate a 3D vertebraic generic model based on the statistical database of CT scans in this study. Moreover, we also discuss a method to generate patient-tailored generic model using the facts obtained from the statistical analysis. To do so, the mesh topologies of CTscanned 3D vertebra models are modified to be identical to each other, and the database is constructed based on them. Furthermore, from the results of a statistical analysis on the database, the tendency of shape distribution is characterized, and the modeling parameters are extracted. By using these modeling parameters for generating the patient-tailored generic model, the computational speed and accuracy of ART can greatly be improved. Furthermore, although this study only includes an application to the C1 (Atlas) vertebra, the entire framework of our method can be applied to other body parts generally. Therefore, it is expected that the proposed method can benefit the various medical imaging applications.