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Hadronic effects on the abundance of strange resonances in heavy ion collisions
Cho Sungtae 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.6
he strange resonance abundance during the hadronic stage. Starting from the discussion on the reduction of the K∗ meson abundance in the hadronic medium, we extend the rate equation in order to understand the abundance of hadrons involving more than three hadrons. Then, we investigate qualitatively the hadronic efects on the Σ(1385) baryon abundance during the hadronic stage; we discuss possible interactions between the Σ(1385) and light mesons in the hadronic matter, and further investigate the time evolution of the Σ(1385) abundance based on the time evolution equation, or the rate equation. We show how the interplay between the decay and formation of the Σ(1385) baryon in the hadronic medium results in the fnal abundance of the Σ(1385) baryon measured in experiments.
Cho, Young-Dan,Kim, Sungtae,Ku, Young Korean Academy of Periodontology 2021 Journal of Periodontal & Implant Science Vol.51 No.-
Purpose: This study aimed to evaluate the effectiveness of the partial split-flap technique with a K-incision on vertical guided bone regeneration (vGBR) and to retrospectively analyze the clinical and radiographic outcomes of dental implantation using this approach. Methods: In total, 78 patients who received 104 dental implants with vGBR, categorized as (1) pre-GBR and post-implantation and (2) simultaneous GBR and implantation, were enrolled. Data analysis was based on periapical radiographs, clinical photos, and dental records. The 2-sample t-test was used to compare the 2 surgical procedures. Results: The baseline vertical bone level, augmented bone height (ABH), and treatment duration were significantly higher in the pre-GBR procedure group. The survival rates of the implants were 96.1% and 94.8% in implant- and patient-based analyses, respectively. In Cox regression analysis, high rates of implant failure were found in the presence of ABH of ≥4 mm, smoking, and diabetes. Conclusions: Within the limitations of this retrospective study, the partial split-flap technique using a K-incision for vGBR showed stable clinical outcomes and favorable dental implant survival.
Rescue of a periodontally compromised tooth by non-surgical treatment: a case report
Cho, Young-Dan,Kim, Sungtae,Koo, Ki-Tae,Seol, Yang-Jo,Lee, Yong-Moo,Rhyu, In-Chul,Ku, Young Korean Academy of Periodontology 2016 Journal of Periodontal & Implant Science Vol.46 No.2
Purpose: This article describes a case of the successful non-surgical management of a periodontally compromised maxillary premolar. Methods: A combination therapy, including root planing, occlusal adjustment, and tooth splinting, was applied. Clinical and radiographic examinations were performed during the 16-month follow-up period. Results: All periodontal parameters were improved. There were dramatic decreases (3-6 mm) in the probing pocket depth, tooth mobility, and marginal bone loss. Interestingly, gradual resolution of the periapical radiolucency and alveolar bone regeneration were observed in the radiographs, and the periodontal condition was maintained during the follow-up period. Conclusions: Within the limits of this study, these results demonstrate the importance of natural tooth preservation through proper periodontal treatment and occlusal adjustment of the periodontally compromised tooth, which is typically targeted for tooth extraction and dental implantation.
실내 환경에서의 AR.Drone 군집 비행 시스템 개발
문성태(SungTae Moon),조동현(Dong-Hyun Cho),한상혁(Sang-Hyuck Han),류동영(DongYoung Rew),공현철(HyunCheol Gong) 한국항공우주연구원 2014 항공우주기술 Vol.13 No.1
최근 쿼드콥터에 대한 관심이 증가하면서 방송에서 군에 이르기까지 다양한 분야에서 활용되고 있다. 특히 다수의 쿼드콥터를 동시에 제어하는 군집 비행 연구는 중요 임무 수행 성공 확률을 높일 수 있고, 예술과 융합되어 군무를 수행하는 등 다양한 응용에 활용될 수 있다. 본 논문에서는 AR.Drone을 활용하여 실내에서 모션 캡쳐 기반으로 다수의 비행체가 서로의 위치를 파악하고, 시나리오에 맞춰 정해진 임무를 수행하기 위해 개발된 군집 비행 시스템을 소개한다. Recently, small quadcopters have been widely used in various areas ranging from military to entertainment applications because interest in the quadcopter increases. Especially, the research on swarm flight which control quadcopters simultaneously without any collision can increase success probability of a important mission. In addition the swarm flight can be applied for demonstrating choreographed aerial maneuvers such as dancing and playing musical instruments. In this paper, we introduce multiple AR.Drone control system based on motion capture for indoor environment in which quadcopters can recognize current position each other and perform scenario based mission.