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조선 초기 관료의 관청이동을 통해 본 주요 통치기구의 위상 - HAVNet 자료를 중심으로 -
최상일 ( Choi Sangil ),백승민 ( Paek Seungmin ),최지우 ( Choi Jiwoo ),예홍진 ( Yeh Hongjin ),이상국 ( Lee Sangkuk ) 수선사학회 2021 史林 Vol.- No.75
This paper is an introductory study to comprehensively grasp the betweenness centrality of government offices in the early Joseon dynasty using HAVNet data. The process of extracting data around the “Annals of the Joseon Dynasty” and designing and building HAVNet as the basis for research was conducted by history and computer science researchers, which were not the usual method in Korean historical research until now. The approach and analysis results carried out in this study are fundamentally different from previous studies related to the government organizations in the early Joseon dynasty. It is unique study in that it was analyzed based on the contents recorded in the Annals of the Joseon dynasty, not on previous research framework of analysis of state administration and government organizations in the early Joseon dynasty. Based on this study, we will conduct an interdisciplinary research that comprehensively analyzes blood ties and relationships among all historical figures of the Joseon dynasty.
Choi, Sangil,Kim, Wondae,Kim, Sungsoo The Basic Science Institute Chosun University 2012 조선자연과학논문집 Vol.5 No.4
In this study, PEDOT thin films polymerized with Iron(III)tosylate ($Fe(PTS)_3$) and grown on acetic acid-catalyzed 3-aminopropyltriethoxysilane self-assembled monolayer (APS-SAM) surfaces by VPP method have been investigated. PEDOT thin films were synthesized on APS self-assembled $SiO_2$ wafer surface at two different concentrations (20 wt% and 40 wt%) and growth time (3 and 30 minutes), and then they were compared. PEDOT vapour phase-polymerized with 40 wt% $Fe(PTS)_3$ oxidant completely formed a thin film on acetic acid-catalyzed APS-SAM surface while with 20 wt% $Fe(PTS)_3$ did not at all. It means that the oxidant can be uniformly coated on acetic acid-catalyzed APS-SAM surface at the 40 wt% concentration, which gives rise to the uniform growth of PEDOT thin film on it.
A Study of Fracture Behavior of Spent Fuel in Long-Term Dry Storage
Sangil Choi,Sangsoon Cho,Seunghwan Yu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
To investigate the mechanical integrity of spent nuclear fuel, the failure behavior of the cladding tube was examined under accident conditions. According to the SNL report, the failure behavior of cladding can be broadly classified into two types. The first is failure due to bending load caused by falling. The second is failure due to pinch load caused by space grid. In this study, mechanical integrity was evaluated through the stress intensity factor applied to the crack in failure behavior due to bending load. Since the exact value of the impact load due to fall was unknown, the load was applied by increasing the value up to 200 G in 20 G increments. The size of the crack is an important input variable, and 300 um was given by referring to the EPRI report, and the elastic modulus, a material property that determines the stress field, was given 75.22 GPa by referring to the FRAPCON code. Since the relationship between the direction of stress and the direction of the crack is also a major variable, simulations were conducted for both cracks perpendicular to and parallel to the stress direction. It was confirmed that at a load of 200 G, when the crack was parallel to the stress direction, stress concentration did not occur and had a very low stress intensity factor 0.01 ???√?. When perpendicular to the direction of stress, the stress intensity factor showed a value of 1 ???√?. However, considering that the critical value of the stress intensity factor due to hydride is 5 ???√?, it can be seen that perpendicular result also ensures the mechanical integrity of the cladding.
Choi Yeram,Park Sangkyu,Lee Seul,Shin Ha-Eun,Kwon Sangil,Choi Jun-Kyu,Lee Myeong-Heon,Seo Seung-Yong,Lee Younghee 한국응용약물학회 2023 Biomolecules & Therapeutics(구 응용약물학회지) Vol.31 No.5
Breast cancer is the most common cancer and a frequent cause of cancer-related deaths among women wordlwide. As therapeutic strategies for breast cancer have limitations, novel chemotherapeutic reagents and treatment strategies are needed. In this study, we investigated the anti-cancer effect of synthetic homoisoflavane derivatives of cremastranone on breast cancer cells. Homoisoflavane derivatives, SH-17059 and SH-19021, reduced cell proliferation through G2/M cell cycle arrest and induced caspase-independent cell death. These compounds increased heme oxygenase-1 (HO-1) and 5-aminolevulinic acid synthase 1 (ALAS1), suggesting downregulation of heme. They also induced reactive oxygen species (ROS) generation and lipid peroxidation. Furthermore, they reduced expression of glutathione peroxidase 4 (GPX4). Therefore, we suggest that the SH-17059 and SH-19021 induced the caspase-independent cell death through the accumulation of iron from heme degradation, and the ferroptosis might be one of the potential candidates for caspase-independent cell death.
A Study of Mechanical Degradation Behavior of Spent Fuel in Long-term Dry Storage
Sangil Choi,Sangsoon Cho,Seunghwan Yu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Research on the safety of nuclear spent fuel has been heavily experimented and modelled from a mechanical perspective. The issues of corrosion, irradiation creep, hydride and hydrogen embrittlement have been addressed more than two decades since the early 2000s. Among these degradation behavior, hydrogen embrittlement and hydride reorientation have been the most important topics for establishing the integrity of nuclear spent fuel and have been studied in depth. In order to assess the safety of spent nuclear fuel, firstly, it is necessary to establish the safety criteria in all nuclear cycle, i.e., the failure criteria guidelines for nuclear fuel assemblies and nuclear fuel rods, and then examine the safety analysis. The contents of U.S.NRC Regulations, Title 10 General, Chapter 1 Code of Federal Regulation (CFR), Part 50, 71 and 72, describe the safety criteria for the safety assessment of nuclear fuel assemblies and nuclear fuel rods. In this study, technically important points in safety analysis on nuclear fuel are checked through the reference of those NRC regulation. As result, we confirmed that the safety assessment of nuclear fuel after 20 years of interim storage is now being tested by ORNL and PNNL. There are not quantitative criteria related to material safety. However qualitative criteria which is dependent on environmentally condition describe the safety analysis. There is some literature study about DBTT, yield stress, ultimate tensile strength, flexural rigidity data. In FRAPCON code Modelling of yield strength and creep had been established, but radial hydride or hydride reorientation has not considered.
Sangil Choi, Wondae Kim, Sungsoo Kim 조선대학교 기초과학연구원 2012 조선자연과학논문집 Vol.5 No.4
In this study, PEDOT thin films polymerized with Iron(III)tosylate (Fe(PTS)3) and grown on acetic acid-catalyzed 3- aminopropyltriethoxysilane self-assembled monolayer (APS-SAM) surfaces by VPP method have been investigated. PEDOT thin films were synthesized on APS self-assembled SiO2 wafer surface at two different concentrations (20 wt% and 40 wt%) and growth time (3 and 30 minutes), and then they were compared. PEDOT vapour phase-polymerized with 40 wt% Fe(PTS)3 oxidant completely formed a thin film on acetic acid-catalyzed APS-SAM surface while with 20 wt% Fe(PTS)3 did not at all. It means that the oxidant can be uniformly coated on acetic acid-catalyzed APS-SAM surface at the 40 wt% concentration, which gives rise to the uniform growth of PEDOT thin film on it.
프로세스 중심 소프트웨어공학 환경의 구성요소간 인터페이스 설계에 관한 연구
최상일,이형원 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
In order to produce a high-quality software product on planned time, all the software development processes should be effectively managed. Process-centered software engineering environments(PCSEEs) are software engineering environments in which software processes are explicitly defined, modeled and enacted. In this paper, we defined interfaces between components of PCSEEs such as process engine, resource manager and agent manager. These interfaces are major building blocks for PCSEEs, so they can be applied to implement a variety of PCSEEs. Also, we simulated the interfaces with a rule-based language CLiPS.
Choi Junghwan,Lee Sangil,Kim Soyeon 한국해운물류학회 2022 The Asian journal of shipping and Logistics Vol.38 No.3
Unlike commercial vessels, training ships have the unique purpose of providing students attempting to become ships’ officers with the onboard training education referred to in the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW code). More than 100 people, including students, are usually aboard these internationally seagoing vessels. Despite training ships requiring strict safety management to prevent maritime accidents and protect lives, they are excluded from the application of key international rules and regulations concerning the safety of these ships due to an ambiguous legal status. Furthermore, there is no comprehensive safety management system at the central governmental level over training ships as they are operated by individual maritime institutions despite them being national property. Against these backgrounds, this research analyses current regulatory issues of training ships at the IMO level and the domestic level by referring to South Korean case. This research conducts a doctrinal legal study to understand the current legal status of training ships the application limits of the IMO regulatory instruments. The research concludes by referring to the necessity of the development of training ships Code to enhance he safety of training ships in the future. © 2022 The Authors. Production and hosting by Elsevier B.V. on behalf of The Korean Association of Shipping and Logistics, Inc. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/). CC_BY_NC_ND_4.0