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Synthesis and characterization of fluorosulfonyl imide isatin biphenylene block copolymer for PEMFC
Ryu, Taewook,Chandra, Sabuj Sutradhar,Ahmed, Faiz,Lopa, Nasrin Siraj,Yoon, Soojin,Yang, Hanmo,Lee, Seungchan,Choi, Inhwan,Kim, Whangi Elsevier 2018 International journal of hydrogen energy Vol.43 No.26
<P><B>Abstract</B></P> <P>In this study, A fluorosulfonyl imide-containing precursor derived from fluorosulfonyl isocyanate was synthesized and grafted on poly (isatin-biphenylene) random and block copolymers. The carbon-carbon structured poly (isatin biphenylene)s were prepared by super acid catalyzed polyhydroxyalkylation reaction with istain, 2,2′-biphenyl, 2,2′-dihydroxybiphenyl. A fluorosulfonyl imide-containing precursor was prepared from chlorosulfuric acid and fluorosulfonylisocyanate. Fluorosulfonyl imide group have higher acidity than sulfonic acid group, therefore the membranes containing fluorosulfonyl imide groups instead of sulfonic acid groups were studied. These membranes showed slightly higher performance of proton conductivity, low water uptake, and good dimensional stability. The structure of the synthesized polymer was investigated by <SUP>1</SUP>H NMR spectroscopy. Surface morphologies will also be assessed by atomic force microscope (AFM). Microphase-separated block copolymers are preferred over random copolymers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Block and random copolymers were synthesized from biphenyl, 2,2′-biphenol and isatin via super acid catalyzed. </LI> <LI> Fluorosulfonyl imide super strong acid was grafted on copolymers instead of sulfonic acid. </LI> <LI> Block copolymer showed better proton conductivity, physical, and chemical stability than random copolymer. </LI> <LI> Block copolymer showed the IEC and water uptake value 1.45 meq./g and 19.14% respectively. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Random and block copolymers successfully synthesized from isatin, biphenyl and 2.2′-biphenol with super acid catalyst. Block copolymer membranes show higher proton conductivity than random copolymers. The block copolymer showed the IEC value 1.45 meq./g, water uptake 19.14% and the proton conductivity 78.89 mS/cm at 80 °C under 90% RH. Block copolymer membrane showed a greater dependence of proton conductivity on the relative humidity, and had higher conductivity and cell performance than that of random copolymer with similar IEC value. These results showed that the morphology of polymer matrix greatly affected the cell performance and membrane with well-separated hydrophilic/hydrophobic phase is very important in the fuel cell application. This research demonstrated the possibility of promising BPIIB membranes for excellent proton conductivity and cell performance.</P> <P>[DISPLAY OMISSION]</P>
Ryu, Taewook,Ahmed, Faiz,Sutradhar, Sabuj Chandra,Lopa, Nasrin Siraj,Yang, Hanmo,Yoon, Soojin,Lee, Seungchan,Choi, Inhwan,Kim, Whangi Elsevier 2018 International journal of hydrogen energy Vol.43 No.26
<P><B>Abstract</B></P> <P>The grafted block copolymer based polymer electrolyte membrane (PEM) was successfully synthesized by the superacid-catalyzed polyhydroxyalkylation reaction from biphenyl, 2,2′-biphenol and isatin and the performance of the block copolymer were compared in conjunction with the random copolymer. These polymers have all carbon-carbon structure on polymer backbone without ether linkage. The bromoalkylsulfone potassium salt was prepared from 1,3-propane sultone and potassium bromide. Particularly, the attached alkyl sulfone groups were afforded better stability due to less reactivity towards nucleophilic substitution reaction. Moreover, the block copolymer exhibited better proton conductivity (76.84 mS/cm under 90% relative humidity at 80 <SUP>°</SUP>C), water resistivity, chemical, and thermal stability compared to the random copolymer, because block copolymer membranes showed good hydrophilic/hydrophobic phase separation and wide ionic channels. The structures of the resultant PEMs were confirmed by <SUP>1</SUP>H NMR spectroscopy and thermogravimetric analysis (TGA). These membranes were studied by proton conductivity, water uptake (WU), and ion exchange capacity (IEC). Fenton test was attended by Fenton's reagent (4 ppm Fe<SUP>2+</SUP>, 3% H<SUB>2</SUB>O<SUB>2</SUB>) for confirmation of the polymer degradation and the surface morphology of membranes was also analyzed by atomic force microscope.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The grafted block copolymer was synthesized via super acid catalyzed reaction. </LI> <LI> The properties of the block copolymer were compared in conjunction with random copolymer. </LI> <LI> Block copolymer exhibited better cell performance compared to random copolymer. </LI> <LI> Grafted block copolymer showed 18.75% water uptake. </LI> </UL> </P>
( Taewook Kong ),( Sukjoon Chang ),( Jiheum Paek ),( Hyogyeong Park ),( Seongwoo Kang ),( Heesug Ryu ) 대한산부인과학회 2015 Obstetrics & Gynecology Science Vol.58 No.5
To evaluate the learning curve of laparoscopic radical hysterectomy (LRH) for gynecologic oncologists who underwent residency- and fellowship-training on laparoscopic surgery without previous experience in performing abdominal radical hysterectomy (ARH).We retrospectively reviewed 84 patients with FIGO (International Federation of Gynecology and Obstetrics) stage IB cervical cancer who underwent LRH (Piver type III) between April 2006 and March 2014. The patients were divided into two groups (surgeon A group, 42 patients; surgeon B group, 42 patients) according to the surgeon with or without ARH experience. Clinico-pathologic data were analyzed between the 2 groups. Operating times were analyzed using the cumulative sum technique.The operating time in surgeon A started at 5 to 10 standard deviations of mean operating time and afterward steeply decreased with operative experience (Pearson correlation coefficient=-0.508, P=0.001). Surgeon B, however, showed a gentle slope of learning curve within 2 standard deviations of mean operating time (Pearson correlation coefficient=-0.225, P=0.152). Approximately 18 cases for both surgeons were required to achieve surgical proficiency for LRH. Multivariate analysis showed that tumor size (>4 cm) was significantly associated with increased operating time (P=0.027; odds ratio, 4.667; 95% confidence interval, 1.187 to 18.352).After completing the residency- and fellowship-training course on gynecologic laparoscopy, gynecologic oncologists, even without ARH experience, might reach an acceptable level of surgical proficiency in LRH after approximately 20 cases and showed a gentle slope of learning curve, taking less effort to initially perform LRH.
Escaping from ancient Rome! Applications and challenges for designing smart cities
Heo, Taewook,Kim, Kwangsoo,Kim, Hyunhak,Lee, Changwon,Ryu, Jae Hong,Leem, Youn Taik,Jun, Jong Arm,Pyo, Chulsik,Yoo, Seung-Mok,Ko, JeongGil Associazione elettrotecnica ed elettronica italian 2014 Transactions on emerging telecommunications techno Vol.25 No.1
<P> From ancient Europe, the renaissance and industrialisation eras, to the modern times, urban planning paradigms have evolved in many ways, advancing the environments where people live in. Nevertheless, the recent development of wireless and wired communication network technologies and low-power miniature sensors for various application domains provide us with another chance of revolutionising cities by making them <I>smarter. Smart cities</I>, propelled by a city-scale infrastructure, where information provided from different application systems integrate together, will initiate the development of new applications that can benefit our everyday lives. This article presents an overview of representative applications that consist a smart city with their respective challenges and application requirements. Furthermore, we share our experiences obtained from designing and deploying examples of such smart systems in multiple application domains and summarise the remaining challenges for making the vision of designing smart cities a reality. </P>
단백질 상호작용 네트워크에서의 단백질 기능예측을 위한 패턴 마이닝
김태욱 ( Taewook Kim ),이미정 ( Meijing Li ),이패패 ( Peipei Li ),류근호 ( Keun Ho Ryu ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
단백질 사이의 상호작용 네트워크(PPI network: Protein-Protein Interaction network)를 이용하여 단백질 기능을 예측 하는 것은 단백질 기능 예측 기법들 중에서 중요한 작용을 한다. 하지만 PPI를 이용한 단백질 기능 예측은 기능의 복잡도와 다양성으로 인해 제한적인 결과를 나타내 왔다. 따라서 본 논문에서는 기존의 연구들 보다 높은 정확도로 단백질 기능을 예측하기 위해 기능 예측을 하려는 단백질과 상호작용 하는 단백질들에 그래프 마이닝 기법을 적용하여 빈발 2-노드 상호작용 패턴을 찾고, 그 패턴을 이용하여 단백질 기능을 예측하는 접근법을 제안하였다. 실험데이터로 DIP(Database of Interacting Proteins)에서 제공하는 단백질 상호작용 데이터를 사용하였으며, 다른 기존의 단백질 기능 예측 기법들보다 높은 정확도를 보여주었다.
2차 충돌 예방을 위한 충돌 후 차량 안정성 확보에 관한 연구
류은혜(Eunhye Ryu),김두용(Dooyong Kim),소민우(Minwoo Soh),권재준(Jaejoon Kwon),홍태욱(Taewook Hong),박기홍(Kihong Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Traffic statistics have shown secondary or multiple event causes fatal injuries more than single event. In this paper, the Secondary Collision Mitigation Algorithm is developed for securing of vehicle stability after impacts. For appropriate control the target yaw rate is created to minimize heading angle and lateral deviation through overlay torque of MDPS and differential braking with ESC module. Impact forces are predicted by 3DOF Collision Model to reconstruct traffic accidents, and these are adopted as CarSim external forces. The performance verification of proposed algorithm is conducted SILS with CarSim.
위험 상황 판단 알고리즘 개발 및 PreScan 기반 성능 검증에 관한 연구
류은혜(Eunhye Ryu),조승우(Seungwoo Jo),권재준(Jaejoon Kwon),홍태욱(Taewook Hong),박기홍(Kihong Park) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
For increasing the performance of the ADAS, a advanced research about awareness of circumstance around the vehicle should be performed. In this paper, therefore, proposes the Risk Situation Awareness Algorithm based on Camera and Radar sensor to combined advantages of each sensor and represents quantitative index of risk situation. The sensors are medeled and driving environment is established using PreScan. To represents vehicle motion, CarSim is adopted. MATLAB/Simulink is used for co-simulation and realizing the awareness algorithm. The performance verification of proposed risk situation awareness algorithm is conducted via SILS with above softwares.