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권동일,고기영,Young Baek Kwon,윤현기,성규보 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.2
Objective: To investigate the technical and clinical outcomes of plug-assisted retrograde transvenous obliteration (PARTO) for the treatment of gastric varices (GV) and to evaluate the role of intra-procedural cone-beam computed tomography (CBCT) performed during PARTO to confirm its technical success. Materials and Methods: From January 2016 to December 2016, 17 patients with GV who had undergone PARTO were retrospectively evaluated. When the proximal part of the afferent vein was identified on a fluoroscopy, non-contrast CBCT images were obtained. In patients with incomplete embolization of GV, an additional injection of gelatin sponges was performed. Follow-up data from contrast-enhanced CT and upper intestinal endoscopy, as well as clinical and laboratory data were collected. Results: Plug-assisted retrograde transvenous obliteration procedures were technically successful in all 17 patients. Complete embolization of GV was detected on CBCT images in 15 patients; whereas, incomplete embolization was detected in two. Complete embolization of GV was then achieved after an additional injection of gelatin sponges in these two patients as demonstrated on the 2nd CBCT image. The mean follow-up period after PARTO was 193 days (range, 73−383 days). A follow-up CT obtained 2−4 months after PARTO demonstrated marked shrinkage or complete obliteration of GV and portosystemic shunts in all 17 patients. There were no cases of variceal bleeding during the follow-up. Conclusion: Plug-assisted retrograde transvenous obliteration is technically and clinically effective for the treatment of GV. In addition, intra-procedural CBCT can be an adjunct tool to fluoroscopy, because it can provide an immediate and accurate evaluation of the technical success of PARTO.
권동일(Dongil Kwon),이경우(Kyung Woo Lee),김성훈(Sung-Hoon Kim),김주영(Ju-Young Kim),이윤희(Yun-Hee Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The nanoindentation technique is widely used to investigate the mechanical properties of nano-microscale materials. The nanoindentation method for assessing mechanical properties at low loads and shallow depths is already well established for the characterization of thin films as well as bulk materials. In this study, we evaluated residual stress in DLC and Au thin films usign nanoindentation technique with a new stress-relaxation model. Moreover, We suggest a composite hardness equation and quantify the magnitude of hardness increase by using an equation based on the interface hardness and the interface thickness, derived by comparing results derived from this equation and those determined in nanoindentation tests. Finally, We present an indentation size effect (ISE) model that extends the available contact depth for ISE application down to several tens of nanometers by considering the tip bluntness effect.
스포츠센터 동호인의 자기관리행동이 자기통제력에 미치는 영향
권동일(Kwon, Dong-Il),남경완(Nam, Kyung-Wan),임승현(Lim, Seung-Hyun) 세계태권도문화학회 2017 세계태권도문화학회지 Vol.8 No.1
This research investigates how sports center users’ self-management affects their self-control. This research will provide fundamental data that identify ways to popularize sports centers and contribute to positive community development of sports through individual change. The purpose of this study is to provide empirical data in order to increase program development for self-control and to provide training resulting in positive change to self-management. There are five sports centers between D metropolitan city and G city. We surveyed users who are from these five sports centers. We explained the object of this study to two graduate students, who already had a prior education, and one researcher. Survey subjects carried out the survey by one of the non-probability sampling, the sampling method in an independent location. We gathered data from 569 subjects and utilized SPSS 18.0 program of Windows in order to draw a conclusion with frequency analysis and factor analysis, reliability analysis, correlation analysis, and multiple regression analysis. First, it shows that the sports center members who displayed good self-management and self-control are statically correlated. Second, it shows that the sports center members who displayed good self-management and its sub factors such as willpower management and life management, intrinsic behavior, and physical management have a positive outcome to self-control of impulsive behavior. Third, it shows that the sports center members who displayed good self-management and its sub factors such as willpower management and life management, intrinsic behavior, and physical management have a positive outcome to self-control of task completion. Fourth, it shows that the sports center members who displayed good self-management and its sub factors such as willpower management and life management, intrinsic behavior, and physical management have a positive outcome to self-control of self-centeredness. Fifth, it shows that the sports center members who displayed good self-management and its sub factors such as willpower management and life management, intrinsic behavior, and physical management have a positive outcome to self-control of negative emotions.and a behavioral commitment, and in a cognitive commitment, a behavioral commitment, a sincerity and an ability, we could verify significant correlations. Third, It proved that player s concentration is influenced by a behavioral pattern of training and instruction, a democratic behavioral pattern, and an authoritative behavioral pattern, which are the sub-factors of leaders leadership. This conclusion shows that a leader s leadership and confidence are very crucial factors when it comes to takwondo players concentrating on the game and maintaining their best game handling ability in the competition. Therefore, there is a need for developing various programs and applying them with taking interest in and caring for takwondo players.