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Synthesis and Characterization of Gel Polymer Electrolyte Using LifsI
류태욱,윤수진,진레이,Wei Zhang,임현민,장기석,김환기 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Solid electrolyte is a field that is receiving much attention recently. However, it has problems that must be solved. When a solid electrolyte is combined with the positive and negative electrodes, a void is created at the interface, which causes a high resistance value. To solve this problem, a new in-situ method was adopted. By using the in-situ method, the polymer is formed directly between the anode and cathode, so it has a low resistance value, which shows a high conductivity. In addition, LiFSI is a catalyst and acts as an electrolytic salt at the same time to suppress side reactions and feature high conductivity. in-situ polymerization technology of solid-state electrolyte is very promising for high-performance solid state lithium batteries.
류태욱,이정훈,강성호,엄기환 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.3
인터넷전화(Internet telephony)는 network를 통하여 음성데이터를 주고받는 응용프로그램으로 좋은 음질의 제공은 필수적이다. 그러나 음성데이터가 네트워크를 통하여 전송이 되면서 전송지연과 지연 편차 등의 Jitter현상에 영향을 받아 음질의 저하를 유발하므로 수신측에서는 적절한 jitter buffer를 제공해야만 한다. 본 논문에서는 인터넷전화에서 보다 양질의 음성을 제공하기 위하여 단말기 입장에서 버퍼관리 알고리즘을 제안한다. 제안한 알고리즘은 현재 단말기에서 사용하고 있는 압축알고리즘의 종류와 수신된 데이터만을 근거 자료로 수신데이터의 변화에 적응적으로 반응하면서 음질을 향상할 수 있는 버퍼관리 알고리즘이다. 제안한 알고리즘의 유용성을 확인하기 위하여 다양한 네트워크 상황에서 기존의 알고리즘과 네트워크 상황판단의 성능을 비교한다. Internet telephony is an application that transmits voice data for conversation. Therefore it must provide high sound quality. However while audio packets are transferred through the network, they are affected by delay variations and jitters, which could result in poor sound quality of the receiving end does not have an appropriate jitter buffer to overcome network factors. This thesis introduces a buffer management algorithm that could be used to provide better sound quality for Internet phone terminals. This algorithm actively responds to both the compression algorithms that are used by the terminals, as well as to the received data to provide an improvement in sound quality. In order to verify the effectiveness of the proposed algorithm, we experimented in variance network settings. The results show that the proposed algorithm improves on the performance of the conventional buffer management algorithm.
In-Situ Polymer Synthesis and Research Using Epoxy Monomers
류태욱,윤수진,Wei Zhang,임현민,장기석,장호현,김환기 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Solid electrolyte is a field that is receiving much attention recently. However, it has problems that must be solved. When a solid electrolyte is combined with the positive and negative electrodes, a void is created at the interface, which causes a high resistance value. To solve this problem, a new in-situ method was adopted. By using the in-situ method, the polymer is formed directly between the anode and cathode, so it has a low resistance value, which shows a high conductivity. In addition, LiFSI is a catalyst and acts as an electrolytic salt at the same time to suppress side reactions and feature high conductivity. in-situ polymerization technology of solid-state electrolyte is very promising for high-performance solidstate lithium batteries.
Synthesis and characterization of sulfonated mutiphenyl conjugated polyimide for PEMFC
류태욱,Sabuj Chandra Sutradhar,Faiz Ahmed,최건영,양한모,윤수진,이성권,김환기 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
A new monomer, di-sulfuricacid-1,1-bis(4-aminophenyl)-2,2-diphenylethylene (SBAPDPE), was synthesizedby direct sulfonation of the parent diamine, 1,1-bis(4-aminophenyl)-2,2-diphenylethylene(BAPDPE) using concentrated sulfuric acid. A series of the side-chain-type sulfonated conjugatedtetraphenylethylene polyimides (SCTPPIs) with different degrees of sulfonation were prepared fromdianhydrides with SBAPDPE and non-sulfonated diamine. The SCTPPIs generally showed good solubilityin m-cresol and DMSO. The membranes were studied by FT-IR, 1H NMR spectroscopy, and TGA. Sorptionexperiments were conducted to observe the interaction of sulfonated polymers with water. The ionexchange capacity (IEC) and proton conductivity were evaluated with increase of degree of sulfonation