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Myeongjin Kang,Kunok Chang 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Spent nuclear fuel temporary storage in South Korea is approximately 70% of total storage capacity as of the 4th quarter of 2022 amount is stored. In addition, according to the analysis of the Korean Radioactive Waste Society, saturation of nuclear power plant temporary storage is expected sequentially from 2031, and accordingly, the need for high-level radioactive waste disposal facilities has emerged. Globally, after the conclusion of the EU Taxonomy, for nuclear energy in order to become an ecofriendly energy, it is necessary to have a high-level radioactive waste disposal site and submit a detailed operation plan for high-level radioactive waste disposal site by 2050. Finland and Sweden have already received permission for the construction of high-level radioactive waste disposal facilities, and other countries, such as Switzerland, Japan, the United States, and Canada, are in the process of licensing disposal facilities. In order to establish a repository for high-level radioactive waste, the performance and safety analysis of the repository must be conducted in compliance with regulatory requirements. For safety analysis, it needs a collection of arguments and evidence. and IAEA defined it as ‘Safety case’. The Systematic method, which derives scenarios by systematizing and combining possible phenomena around the repository, is widely used for developing Safety case. Systematic methods make use of the concept of Features, Events and Processes (FEP). FEP identifies features that affect repository performance, events that can affect a short period of time, and processes that can have an impact over a long period of time. Since it is a characteristic of the Systematic method to compose a scenario by combining these FEP, the Systematic method is the basic premise for the development of FEP. Completeness is important for FEP, and comprehensiveness is important for scenarios. However, combining all the FEP into one scenario is time-consuming and difficult to ascertain the comprehensiveness of the scenario. Therefore, an Integrated FEP list is being developed to facilitate tracking between FEP and scenarios by integrating similar FEP. In this study, during the integrated FEP development process, a method for utilizing experts that can be used for difficult parts of quantitative evaluation and a quantitative evaluation process through the method were presented.
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Integration of FEPs for Development of Scenarios
Myeongjin Kang,Hyungdae Kim,Gyunyoung Heo,Kunok Chang 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
According to the analysis of the Korean Radioactive Waste Society, saturation of nuclear power plant temporary storage is expected sequentially from 2031, and accordingly, the need for highlevel radioactive waste disposal facilities has emerged. In order to establish a repository for high-level radioactive waste, the performance and safety analysis of the repository must be conducted in compliance with regulatory requirements. For safety analysis, it needs a collection of arguments and evidence. and IAEA defined it as ‘Safety case’. The Systematic method, which derives scenarios by systematizing and combining possible phenomena around the repository, is widely used for developing Safety case. Systematic methods make use of the concept of Features, Events and Processes (FEP). FEP identifies features that affect repository performance, events that can affect a short period of time, and processes that can have an impact over a long period of time. Many countries, such as Finland, Sweden, Japan, United States, etc., are in process of licensing disposal facilities by using ‘Safety case’. And they then develop their own project-specified FEP lists and employ them for performing safety assessments. However, the systematic procedure for generating scenarios for safety evaluation is not clearly defined. According to the International Atomic Energy Agency (IAEA) Safety Standards Series (SSG- 23), the bottom-up method is an approach for conducting safety analysis using Features, Events, and Processes (FEPs). However, the process of how each FEP is utilized to establish a scenario for safety evaluation remains unclear. Additionally, there exists not only a bottom-up approach for generating scenarios using FEPs, but also a hybrid scenario development method that incorporates a top-down approach based on safety functions. Each country address scenario derivation in accordance with the adopted hybrid method. Nevertheless, a challenge arises in its application due to discrepancies between their approach and the hybrid approach specific which we are going on. Hence, this study introduces the FEP integration methodology for generating scenarios based on the hybrid scenario development method using the FEP list.
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Early implant failure: a retrospective analysis of contributing factors
Kang, Dae-Young,Kim, Myeongjin,Lee, Sung-Jo,Cho, In-Woo,Shin, Hyun-Seung,Caballe-Serrano, Jordi,Park, Jung-Chul Korean Academy of Periodontology 2019 Journal of Periodontal & Implant Science Vol.49 No.5
Purpose: The aim of this retrospective study was to determine the prevalence of early implant failure using a single implant system and to identify the factors contributing to early implant failure. Methods: Patients who received implant treatment with a single implant system ($Luna^{(R)}$, Shinhung, Seoul, Korea) at Dankook University Dental Hospital from 2015 to 2017 were enrolled. The following data were collected for analysis: sex and age of the patient, seniority of the surgeon, diameter and length of the implant, position in the dental arch, access approach for sinus-floor elevation, and type of guided bone regeneration (GBR) procedure. The effect of each predictor was evaluated using the crude hazard ratio and the adjusted hazard ratio (aHR) in univariate and multivariate Cox regression analyses, respectively. Results: This study analyzed 1,031 implants in 409 patients, who comprised 169 females and 240 males with a median age of 54 years (interquartile range [IQR], 47-61 years) and were followed up for a median of 7.2 months (IQR, 5.6-9.9 months) after implant placement. Thirty-five implants were removed prior to final prosthesis delivery, and the cumulative survival rate in the early phase at the implant level was 95.6%. Multivariate regression analysis revealed that seniority of the surgeon (residents: aHR=2.86; 95% confidence interval [CI], 1.37-5.94) and the jaw in which the implant was placed (mandible: aHR=2.31; 95% CI, 1.12-4.76) exerted statistically significant effects on early implant failure after adjusting for sex, age, dimensions of the implant, and type of GBR procedure (preoperative and/or simultaneous) (P<0.05). Conclusions: Prospective studies are warranted to further elucidate the factors contributing to early implant failure. In the meantime, surgeons should receive appropriate training and carefully select the bone bed in order to minimize the risk of early implant failure.
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Lee, Hyunkoo,Kang, Chan-Mo,Park, Myeongjin,Kwak, Jeonghun,Lee, Changhee American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.6
<P>We demonstrated highly efficient inverted bottom-emission organic light-emitting diodes (IBOLEDs) using tin dioxide (SnO<SUB>2</SUB>) nanoparticles (NPs) as an electron injection layer at the interface between the indium tin oxide (ITO) cathode and the organic electron transport layer. The SnO<SUB>2</SUB> NP layer can facilitate the electron injection since the conduction band energy level of SnO<SUB>2</SUB> NPs (−3.6 eV) is located between the work function of ITO (4.8 eV) and the lowest unoccupied molecular orbital (LUMO) energy level of typical electron transporting molecules (−2.5 to −3.5 eV). As a result, the IBOLEDs with the SnO<SUB>2</SUB> NPs exhibited a decrease of the driving voltage by 7 V at 1000 cd/m<SUP>2</SUP> compared to the device without SnO<SUB>2</SUB> NPs. They also showed a significantly enhanced luminous current efficiency of 51.1 cd/A (corresponds to the external quantum efficiency of 15.6%) at the same brightness, which is about two times higher values than that of the device without SnO<SUB>2</SUB> NPs. We also measured the angular dependence of irradiance and electroluminescence (EL) spectra in the devices with SnO<SUB>2</SUB> NPs and found that they had a nearly Lambertian emission profile and few shift in EL spectrum through the entire viewing angles, which are considered as remarkable and essential results for the application of OLEDs to display devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-6/am302787y/production/images/medium/am-2012-02787y_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302787y'>ACS Electronic Supporting Info</A></P>
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주은선(EunSun Joo),강명진(MyeongJin Kang),최민정(MinJung Choi) 한국보육지원학회 2018 한국보육지원학회지 Vol.14 No.5
Objective: The purpose this study is to explore the relationship between grandmothers and mothers when grandmothers take care of their grandchildren, and to understand the particular meaning of it. Methods: The Participants were 5 grandmothers who have supported or have experience in caring for their grandchildren, and their daughters(5 working mothers) who have entrusted their children to them. In-depth interviews were conducted and analysed by the phenomenological qualitative research method. Results: Seventeen sub-constructs and 5 constructs resulted in: (1) Motivation of grandmothers and mothers for taking care of grandchildren. (2) Pressure of grandmothers and satisfaction of mothers for the support. (3) Grandmothers stepping back and saying Not my child and mothers saying It s my child and thinking their influence is big. (4) Consistent sacrifice of grandmothers and mothers who cannot do the same. (5) Grandmothers feeling empty after caring for their grandchildren and mothers realizing their efforts. Conclusion/Implications: This study attempted to understand the relationship between grandmothers and mothers when grandmothers take care of their grandchildren from multi-perspectives. Through the findings, the need for developing healthy relationships and a caring environment for grandmothers and their grandchildren is stressed.
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융합인재교육(STEAM)의 중등 음악수업 적용 및 사례연구
오지향(Oh,Jihyang),정재은(Jeong, Jaeeun),강선영(Kang, Sunyoung),하명진(Ha, Myeongjin) 학습자중심교과교육학회 2014 학습자중심교과교육연구 Vol.14 No.1
본 연구는 음악을중심으로 다른교과와의 연계를통해 다른영역에대한이해를돕고동시에음악적지식과음악활동경험의 심화를 통하여 학생들의 창의적이고 융합적인 능력을 키울수 있도록 융합인재교육(STEAM)을 중등음악수업에 적용하고자 하였다. 이를 위하여 STEAM의 중등교육에의 적용 및 음악교육에의 적용을 중심으로 이론적 고찰을 수행 하였으며,이를 바탕으로 음악중심 융합 수업의 구성 및 방향을 제시 하였다.또한,수업의 구성 및방향을구체화하기 위하여 중학교와 고등학교 음악수업의 실제적용사례를 제시함으로써 음악을중심으로 한 융합인재교육(STEAM)의 가능성을 모색하고자 하였다 The purpose of this study is to apply and suggest the examples of STEAM in secondary music education. To accomplish this purpose, this study is divided into three parts: STEAM and music education, the direction of construction and suggestion of the model of STEAM in Music, and lesson plan for middle and high school music classroom. First of all, preceding research was analyzed for offering the logical basis for this study. STEAM and the case of applying STEAM to music education was examined and investigation of STEAM focused on the National Curriculum was followed. Then the direction of construction and suggestion of the model of STEAM in music was demonstrated. The model of STEAM in music are emphasized on presentation of situation, creative design, emotional experience. Finally, lesson plans for middle school and high school music class were demonstrated for seeking the possibility of STEAM focused on music.
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에지 클라우드 협동 이미지 처리기반 메타버스에서 스트리밍 가능한 저전력 AI 소프트웨어의 런타임 실행
강명진,김호,박정원,양승범,윤준서,박대진,Kang, Myeongjin,Kim, Ho,Park, Jungwon,Yang, Seongbeom,Yun, Junseo,Park, Daejin 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.11
As the interest in the 4th industrial revolution and metaverse increases, metaverse with multi edge structure is proposed and noted. Metaverse is a structure that can create digital doctor-like system through a large amount of image processing and data transmission in a multi edge system. Since metaverse application requires calculating performance, which can reconstruct 3-D space, edge hardware's insufficient calculating performance has been a problem. To provide streamable AI software in runtime, image processing, and data transmission, which is edge's loads, needs to be lightweight. Also lightweight at the edge leads to power consumption reduction of the entire metaverse application system. In this paper, we propose collaborative edge-cloud image processing with remote image processing method and Region of Interest (ROI) to overcome edge's power performance and build streamable and runtime executable AI software. The proposed structure was implemented using a PC and an embedded board, and the reduction of time, power, and network communications were verified.
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