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Development of the Titanium Dioxide Photocatalyst Coating for Asphalt Pavement
Daeseong Jang,Young Kim,Dr. SangHoon Kim,Dr. JaeJun Lee 한국도로학회 2018 한국도로학회 학술대회 발표논문 초록집 Vol.2018 No.05
This study shows the development of a photocatalytic technology for the road to decompose the nitrogen oxides(NOx) using a titanium oxide(TiO2) photocatalyst coating method for reducing the air pollution
Nanopatterns with a Square Symmetry from an Orthogonal Lamellar Assembly of Block Copolymers
Cha, Seung Keun,Yong, Daeseong,Yang, Geon Gug,Jin, Hyeong Min,Kim, Jang Hwan,Han, Kyu Hyo,Kim, Jaeup U.,Jeong, Seong-Jun,Kim, Sang Ouk American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.22
<P>A nanosquare array is an indispensable element for the integrated circuit design of electronic devices. Block copolymer (BCP) lithography, a promising bottom-up approach for sub-10 nm patterning, has revealed a generic difficulty in the production of square symmetry because of the thermodynamically favored hexagonal packing of self-assembled sphere or cylinder arrays in thin-film geometry. Here, we demonstrate a simple route to square arrays via the orthogonal self-assembly of two lamellar layers on topographically patterned substrates. While bottom lamellar layers within a topographic trench are aligned parallel to the sidewalls, top layers above the trench are perpendicularly oriented to relieve the interfacial energy between grain boundaries. The size and period of the square symmetry are readily controllable with the molecular weight of BCPs. Moreover, such an orthogonal self-assembly can be applied to the formation of complex nanopatterns for advanced applications, including metal nanodot square arrays.</P> [FIG OMISSION]</BR>
Establishment of Management System for Radioactive Waste Containings Hazardous Substances
Yunjeong Hong,Dongju Lee,Daeseong Nam,Jonghwa Pack,Yungun Jung,Heungju Cho,Sungjin Han,Wonhyuk Jang,Tackjin Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
As the acceptance criteria for low-intermediate-level radioactive waste cave disposal facilities of Korea Radioactive Waste Agency (KORAD) were revised, the requirements for characterization of whether radioactive waste contains hazardous substances have been strengthened. In addition, As the recent the Nuclear Safety and Security Commission Notice (Regulations on Delivery of Low- Medium-Level Radioactive Waste) scheduled to be revised, the management targets and standards for hazardous substances are scheduled to be specified and detailed. Accordingly, the Korea Atomic Energy Research Institute (KAERI) needs to prepare management methods and procedures for hazardous substances. In particular, in order to characterize the chemical requirements (explosiveness, ignitability, flammability, corrosiveness, and toxicity) contained in radioactive waste, it must be proven through documents or data that each item does not contain hazardous substances, and quality assurance for the overall process must be provided. In order to identify the characteristics of radioactive waste that will continue to be generated in the future, KAERI needs to introduce a management system for hazardous substances in radioactive waste and establish a quality assurance system. Currently, KAERI is thoroughly managing chelates (EDTA, NTA, etc.), but the detailed management procedures for hazardous substances related to chemical requirements in radioactive waste in the radiation management area specified above are insufficient. The KAERI’s Laboratory Safety Information Network has a total periodic regulatory review system in place for the purchase, movement, and disposal of chemical substances for each facility. However, there is no documents or data to prove that the hazardous substances held in the facility are not included in the radioactive waste, and there are no procedures for managing hazardous substances. Therefore, it is necessary to establish procedures for the management of hazardous substances, and we plan to prepare management procedures for hazardous substances so that chemical substances can be managed according to the procedures at each facility during preliminary inspection before receiving radioactive waste. The procedure provides definitions of terms and types of management targets for each characteristic of the chemical requirements specified above (explosiveness, ignition, flammability, corrosiveness, and toxicity). In addition, procedure also contains treatment methods of radioactive waste generated by using hazardous substances and management methods of in/out, quantity, history of that substances, etc. As the law is revised in the future, management will be carried out according to the relevant procedures. In this study, we aim to present the hazardous substance management procedures being established to determine whether radioactive waste contains hazardous substances in accordance with the revised the notice and strengthened acceptance criteria. Through this, we hope to contribute to improving reliability so that radioactive waste could be disposed of thoroughly and safely.
동적 거동을 이용한 토크컨버터 댐퍼 충격량 및 강도에 대한 연구
성상현(Sanghyun Sung),홍순석(Soonseok Hong),장재덕(Jaeduk Jang),주인식(Insik Joo),배대성(DaeSeong Bae) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Torque converter in automatic transmission transfers the engine power to transmission by ATF. A Torque converter consists of the hydrodynamic clutch device and the lock-up clutch device. The retaining plate and driven plate are part of the lock-up clutch. Lock-up clutch transfers the engine torque directly to automatic transmission. So it must have resistance and durability. And between retaining plate and driven plate happen impact. To analysis the dynamic Motion of damper system has been carried out using Torque Converter Toolkit made by OPEN API module in DAFUL. This paper is provided torque converter engineer with useful information for stopper impact and stress of damper system.