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Jaemin Jung,Seong-Su Jeon,Sukhoon Kim,Jeong-Hwan Lee,Haeryong Jung 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Bentonite, a material mainly used in buffer and backfill of the engineering barrier system (EBS) that makes up the deep geological repository, is a porous material, thus porewater could be contained in it. The porewater components will be changed through ‘water exchange’ with groundwater as time passes after emplacement of subsystems containing bentonite in the repository. ‘Water exchange’ is a phenomenon in which porewater and groundwater components are exchanged in the process of groundwater inflow into bentonite, which affects swelling property and radionuclide sorption of bentonite. Therefore, it is necessary to assess conformity with the performance target and safety function for bentonite. Accordingly, we reviewed how to handle the ‘water exchange’ phenomenon in the performance assessment conducted as part of the operating license application for the deep geological repository in Finland, and suggested studies and/or data required for the performance assessment of the domestic disposal facility on the basis of the results. In the previous assessment in Finland, after dividing the disposal site into a number of areas, reference and bounding groundwaters were defined considering various parameters by depth and climate change (i.e. phase). Subsequently, after defining reference and bounding porewaters in consideration of water exchange with porewater for each groundwater type, the swelling and radionuclides sorption of bentonite were assessed through analyzing components of the reference porewater. From the Finnish case, it is confirmed that the following are important from the perspective of water exchange: (a) definition of reference porewater, and (b) variations in cation concentration and cation exchange capacity (CEC) in porewater. For applying items above to the domestic disposal facility, the site-specific parameters should be reflected for the following: structure of the bedrock, groundwater composition, and initial components of bentonite selected. In addition, studies on the following should be required for identifying properties of the domestic disposal site: (1) variations in groundwater composition by subsurface depth, (2) variations in groundwater properties by time frame, and (3) investigation on the bedrock structure, and (4) survey on initial composition of porewater in selected bentonite The results of this study are presumed to be directly applied to the design and performance assessment for buffer and backfill materials, which are important components that make up the domestic disposal facility, given the site-specific data.
Yun, Seong-Jae,Song, Young-Kwang,Kim, Minji,Shin, Jaemin,Jin, Sung-Ho,Kang, Sung Kwon,Kim, Young-Inn Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.11
Two novel phosphorescent heteroleptic cationic Ir(III) complexes, Ir(bt)2(dmpe) (Ir1) and Ir (bt)2(dppe) (Ir2), where bt is 2-phenylbenzothiazole, dmpe is 1,2-bis(dimethylphosphino)ethane, and dppe is 1,2-bis(diphenyl-phosphino) ethane, were designed and synthesized. Their photophysical and electrochemical properties and the X-ray structure of the Ir1 complex were investigated. The prepared Ir(III) complexes exhibited blue-green emissions at 503-538 nm with vibronic fine structures in dichloromethane solution and PMMA film, implying that the lowest excited states are dominated by ligand-based $^3{\pi}-{\pi}^*$ transitions. The ${\pi}$-acceptor ability of the diphosphine ancillary ligand leads to blue-shift emission. The room temperature photoluminescent quantum yields (PLQYs) of Ir1 and Ir2 were 52% and 45%, respectively, in dichloromethane solution. These high PLQYs resulted from steric hindrances by the bulky cationic iridium complexes. The crystal structure of Ir1 was determined by X-ray crystallography, which revealed that central iridium adopted a distorted octahedral structure coordinated with two bt ligands (N^C) and one dmpe ligand (P^P) showing cis C-C and trans N-N dispositions. The bent nature of the dmpe ligand resulted in a relatively wide bite angle of $83.83^{\circ}$ of P-Ir-P.
신재민(Jaemin Shin),정성호(Seong-Ho Jeong) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
ICN(Information-Centric Networking) 방식은 호스트 기반의 기존 인터넷 기술과는 달리 정보의 이름 자체에 초점을 두고 정보를 전달하는 네트워킹 방식으로 고속 전송을 위한 캐싱을 비롯한 다양한 기능들을 이용하여 차세대 네트워크에 적용될 수 있는 패러다임으로 주목받고 있다. 한편 SDN(Software-Defined Network)은 제어 평면과 데이터 평면을 분리하고 라우터와 같은 네트워크 장비의 기능을 외부에서 정의하고 데이터 전달 경로 설정 및 제어를 함으로써 다양한 응용 서비스를 효과적으로 지원하기 위한 네트워킹 환경을 제공할 수 있다. 이러한 SDN 의 플로우 기반 통신 기능을 ICN 과 결합하면 전송 효율 등의 측면에서 보다 나은 서비스 제공이 가능하다. 본 논문에서는 OpenFlow 프로토콜을 사용하는 SDN 기능을 ICN 네트워크 환경에 적용하고 컨트롤러의 경로 설정 시 발생하는 과부하 문제를 해결하는 방안을 제시하며 그 성능을 측정 및 분석한다.