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하이브리드 커패시터의 열안정성 개선을 위한 LiFePO<sub>4</sub> 복합양극 소재에 관한 연구
권태순 ( Tae-soon Kwon ),박지현 ( Ji-hyun Park ),강석원 ( Seok-won Kang ),정락교 ( Rag-gyo Jeong ),한상진 ( Sang-jin Han ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.2
The application of composite cathode materials including LiFePO<sub>4</sub> (lithium iron phosphate) of olivine crystal structure, which has high thermal stability, were investigated as alternatives for hybrid battery-capacitors with a LiMn<sub>2</sub>O<sub>4</sub> (spinel crystal structure) cathode, which exhibits decreased performance at high temperatures due to Mn-dissolution. However, these composite cathode materials have been shown to have a reduction in capacity by conducting life cycle experiments in which a LiFePO<sub>4</sub>/activated carbon cell was charged and discharged between 1.0 V and 2.3 V at two temperatures, 25 ℃ and 60 ℃, which caused a degradation of the anode due to the lowered voltage in the anode. To avoid the degradation of the anode, composite cathodes of LiFePO<sub>4</sub>/LiMn<sub>2</sub>O<sub>4</sub> (50:50 wt%), LiFePO<sub>4</sub>/activated carbon (50:50 wt%) and LiFePO<sub>4</sub>/LiNi<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> (50:50 wt%) were prepared and the life cycle experiments were conducted on these cells. The composite cathode including LiNi<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> of layered crystal structure showed stable voltage behavior. The discharge capacity retention ratio of LiFePO<sub>4</sub>/LiNi<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> was about twice as high as that of a LiFePO<sub>4</sub>/LiMn<sub>2</sub>O<sub>4</sub> cell at thermal stability experiment for a duration of 1,000 hours charged at 2.3 V and a temperature of 80 ℃.
원자층 증착법을 이용한 Al₂O₃/TiO₂ 보호막의 수분 보호 특성
권태석(Tae-Suk Kwon),문연건(Yeon-Keon Moon),김웅선(Woong-Sun Kim),문대용(Dae-Yong Moon),김경택(Kyung-Taek Kim),신새영(Sae-Young Shin),한동석(Dong-Suk Han),박재근(Jae-Gun Park),박종완(Jong-Wan Park) 한국진공학회(ASCT) 2010 Applied Science and Convergence Technology Vol.19 No.6
원자층 증착법(ALD: atomic layer deposition)을 이용하여 PES (poly (ether sulfon)) 기판위에 증착 온도, 플라즈마 파워에 따라 Al₂O₃와 TiO₂ 박막을 증착했다. 공정 조건에 따라 Al₂O₃와 TiO₂ 박막의 밀도, 탄소의 함유량이 달라지는 것을 알 수 있었으며, 공정 조건을 변화시켜 고밀도의 박막을 얻을 수 있었다. 플라즈마에 의한 PES 기판 손상을 막기 위해 buffer layer를 도입했으며, 또한 박막 내부 결함에 의한 수분 투과를 지연 또는 막기 위해 다층 구조를 증착했다. 이를 분석하기 위해 MOCON test를 이용해 투습률을 조사하였다. 플라스틱 기판에 다층 구조의 무기물 보호막을 적용했을 시 플라스틱 기판의 투습률 특성이 개선되었으며, 수분 투과에 대한 activation energy 또한 증가하는 것을 알 수 있었다. In this study, Al₂O₃ and TiO₂ films was deposited on to PES (poly(ethersulfon) substrate by using atomic layer deposition as functions of deposition temperature and plasma power. The density and carbon contents of Al₂O₃ and TiO₂ films was changed by varying process conditions. High density thin films was achieved through optimizing the process conditions. Buffer layer was deposited prior to the processing of upper thin films to avoid PES surface destruction during the high power plasma process and to enhances the tortuous path for water vapor permeation for the defect decoupling effect. The water vapor transmission rate by using MOCON test was investigated to analyze the effect. Water vaper permeation properties was improved by using the inorganic multi-layer passivation layer and activation energy of the water vapor permeation was increased.
헛개나무열매 열수추출물 투여에 의한 흰쥐의 지구력 향상 효과
권태형,한준희,이선엽,유근형,Kwon, Tae-Hyung,Han, Joon-Hee,Lee, Sun-Yeop,Yu, Keun-Hyung 한국식품영양학회 2020 韓國食品營養學會誌 Vol.33 No.4
This study was designed to evaluate the improvement in exercise endurance by Hovenia dulcis fruit hot water extract (HDWE) for the potential application as a functional food material. The effect was based on the evaluation of the forced-swimming capacity and changes in biochemical parameters in mice. Six-week-old mice were classified into four groups based on a randomized block design: the negative control group, the HDWE 50 mg/kg body weight group, the HDWE 200 mg/kg body weight group, and the 1-octacosanol 50 mg/kg body weight group (n=8 mice per group). The swimming exercise time in the HDWE-50 group was increased at 545±43 sec compared to the control group at 263±28 sec. The HDWE-200 fatigue indicators, lactate acid and ammonia content, decreased to 4.99±0.33 mg/mL and 0.63±0.05 mg/mL, respectively. In addition, the content of glycogen in the liver and muscle tended to increase in the group administered HDWE but was not significant. Likewise, the LDH and glucose contents were increased compared to the control group. The muscle damage indicators ALT (52.7±2.6 U/L) and AST (42.5±5.2 U/L) tended to decrease compared to the control group (76.4±10.2 U/L).
원자층 증착법을 이용한 Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> 보호막의 수분 보호 특성
권태석,문연건,김웅선,문대용,김경택,신새영,한동석,박재근,박종완,Kwon, Tae-Suk,Moon, Yeon-Keon,Kim, Woong-Sun,Moon, Dae-Yong,Kim, Kyung-Taek,Shin, Sae-Young,Han, Dong-Suk,Park, Jae-Gun,Park, Jong-Wan 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.6
원자층 증착법(ALD: atomic layer deposition)을 이용하여 PES (poly (ether sulfon)) 기판위에 증착 온도, 플라즈마 파워에 따라 $Al_2O_3$와 $TiO_2$ 박막을 증착했다. 공정 조건에 따라 $Al_2O_3$와 $TiO_2$ 박막의 밀도, 탄소의 함유량이 달라지는 것을 알 수 있었으며, 공정 조건을 변화시켜 고밀도의 박막을 얻을 수 있었다. 플라즈마에 의한 PES 기판 손상을 막기 위해 buffer layer를 도입했으며, 또한 박막 내부 결함에 의한 수분 투과를 지연 또는 막기 위해 다층 구조를 증착했다. 이를 분석하기 위해 MOCON test를 이용해 투습률을 조사하였다. 플라스틱 기판에 다층 구조의 무기물 보호막을 적용했을 시 플라스틱 기판의 투습률 특성이 개선되었으며, 수분 투과에 대한 activation energy 또한 증가하는 것을 알 수 있었다. In this study, $Al_2O_3$ and $TiO_2$ films was deposited on to PES (poly(ethersulfon) substrate by using atomic layer deposition as functions of deposition temperature and plasma power. The density and carbon contents of $Al_2O_3$ and $TiO_2$ films was changed by varying process conditions. High density thin films was achieved through optimizing the process conditions. Buffer layer was deposited prior to the processing of upper thin films to avoid PES surface destruction during the high power plasma process and to enhances the tortuous path for water vapor permeation for the defect decoupling effect. The water vapor transmission rate by using MOCON test was investigated to analyze the effect. Water vaper permeation properties was improved by using the inorganic multi-layer passivation layer and activation energy of the water vapor permeation was increased.
권태성 ( Kwon Tae Seong ),박영석 ( Park Yeong Seog ),권영한 ( Kwon Yeong Han ),송미영 ( Song Mi Yeong ),신상철 ( Sin Sang Cheol ),박지두 ( Park Ji Du ) 한국산림과학회 2003 한국산림과학회지 Vol.92 No.6
This study was carried out to estimate the effects of aerial applications of fenitrothion on arthropod communities in pine forests. Since 1988 the applications have been conducted in Busan and Gyeongsangnam-province to control Monochamus alternatus Hope, a vector of the pine wilt disease, Bursapelenchus xylophilus (Steiner 81 Buhrer) Nickle. Abundance, species richness and community structure of arthropods in crown, undergrowth and ground of pine forests were compared between the aerial-sprayed and un-sprayed sites in the 4 regions in Busan and Gyeongsannam-province of Korea. The pesticide aerial applications did not make any significant influences on the abundances (No. individuals per sample) and taxon composition of arthropods, whereas it made some effects on species diversity. Arthropod richness (no. species per site) in undergrowth was lower in long-term pesticide applied sites than in short-term applied sites, whereas P-diversity (heterogeneity of species) of arthropod communities in ground was lower in pesticide-treated sites than in untreated sites.