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Junghan Kim,Yoon-Ah Kook,Mohamed Bayome,Jae Hyun Park,Won Lee,Hojae Choi,Noha H. Abbas 대한치과교정학회 2019 대한치과교정학회지 Vol.49 No.4
Objective: The aim of this study was to evaluate the amount of tooth movement and histologic changes with different corticotomy designs and micro-osteoperforation in rabbits. Methods: The sample consisted of 24 rabbits divided into three experimental groups (triangular corticotomy [TC] and indentation corticotomy [IC] with flap, and flapless micro-osteoperforations [MP]) and a control. A traction force of 100 cN was applied by connecting the first premolars to the incisors. The amount of tooth movement was measured. Kruskal–Wallis test was used to assess differences in tooth movement between the groups. Micro-computed tomography, hematoxylin and eosin staining, and tartrate-resistant acidic phosphatase (TRAP) analysis were performed. Analysis of variance was applied to assess differences in TRAP-positive osteoclast count between the groups. Results: The amount of tooth movement increased by 46.5% and 32.0% in the IC and MP groups, respectively, while the bone fraction analysis showed 69.7% and 8.5% less mineralization compared to the control. There were no significant intergroup differences in the number of TRAPpositive osteoclasts. Conclusions: The micro-osteoperforation group showed no significant differences in the amount of tooth movement compared to the corticotomy groups, nor in the TRAP-positive osteoclast count compared to both corticotomy groups and control.
Method for Predicting Thermal Fatigue Life of Thermal Barrier Coatings Using TGO Interface Stress
Junghan Yun,Sunguk Wee,Soo Park,Jeong-Min Lee,Hyunwoo Song,Chang-Sung Seok 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.9
Thermal barrier coatings (TBCs) applied to high-temperature components of gas turbines consist of a ceramic top coat, a metallic bond coat, and thermally grown oxide (TGO) generated between the top coat and bond coat. Because TBCs are subjected to repeated thermal stress at the coating interface under thermal fatigue conditions and eventually breakage, it is crucial to evaluate the thermal fatigue durability of TBCs according to the stress. In this study, coin-type TBC specimens were prepared by depositing commercial coating powders on Ni-based super alloys via the air plasma spray method, and the thermal fatigue life of the TBCs was experimentally evaluated. According to the test results and references, a finite-element analysis was conducted. The maximum stress of the TGO interface was evaluated according to the thickness and equivalent elastic modulus, and simulating the microstructure including the pores of the top coat. Using these relationships, a thermal fatigue life prediction equation considering the coating thickness (t), equivalent elastic modulus (E), and operating temperature (T) was derived, and subsequently verified.
A Measurement Study on Evaluating Container Network Performance for Edge Computing
Junghan Yoon,Jian Li,Sangho Shin 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
With the development of cloud technology, people are focusing on lightweight container technology. Container networking is a core technology in providing high-level cloud services, and there are various implementation models such as Container Network Model (CNM) and Container Network Interface (CNI). Among them, CNI is a de-facto standard adopted by various container platforms. There are many plugins that implement the CNI networking model, and the implementation method differs, showing a great difference in a view of performance. MEC (Multi-Access Edge Computing) is a technology that provides services by locating the server closest to the user who wants to use mobile communication services. In this paper, the performance was measured by applying various CNI network plugins to the CoV architecture. Through this measurement, we analyzed the factors of network performance degradation. The result of the analysis is expected to be used as a good reference in constructing the CoV architecture for low latency in the future.