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이재영(Jae-Young Lee),정우성(Woo-Sung Jung),권태순(Tae-Soon Kwon),방윤석(Yoon-Sock Bang) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Recently, the national target of GHG reduction has be presented voluntarily in whole world as it will be allocated regionally in Post-Kyoto mechanism. Korean government will also set up the GHG reduction target of 2020 soon. In the Korean railroad, ERP(Eco-green Railway Program) 2020 has been performing to countermeasure climate change polices from 2008. The aim of this study was to analyze CO2 emission and to predict its prospects by 2020 if the additional efforts do not be carried out for CO2 reduction. The CO2 emission was calculated using the amount of energy consumption from the operation of railcars and facilities, and then the change till 2020 was estimated. In the future, the GHG reduction target of Korean Railroad in 2020 will be determined reasonably on the application of railroad policies and technologies.
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 ℃.
권태순(Tae-Soon Kwon),이승태(Seung-Tae Lee),송철화(Chul-Hwa Song) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A new design feature of DVI+, to mitigate an ECC bypass fraction and to prevent switching an ECC outlet to a break flow inlet during a DVI line break, is presented for an advanced DVI system. The injected ECC water into the downcomer is easily shifted to the broken cold leg by a high steam cross flow which is coming from the intact cold legs during the late reflood phase of a LBLOCA in the current DVI system. For a protective ECC flow down channel from a high-speed cross flow in a downcomer, a 4-duct which is called an ECC extension duct is installed at the outside of a core barrel cylinder. The ECC extension duct has a gap (height to the radial direction) of 3/25~7/25 of the downcomer annulus gap. The DVI nozzle and the ECC extension duct are only connected by the ECC water jet which is called a hydrodynamic water bridge during an ECC injection period. Otherwise these two components are disconnected from each other without any pipes inside the downcomer. The ECC extension duct is fully separated ECC water down flow channels from the steam flow downcomer annulus during a LOCA event. The injected ECC water flows downward into the lower down comer through the ECC extension duct without a strong entrainment to a steam cross flow. The outer downcomer annulus of the ECC extension duct is the major steam flow zone coming from the intact cold leg during a LBLOCA. During a DVI line break, the separated DVI nozzle and extension duct have the effect of preventing the level of the cooling water from being lowered in the downcomer due to an inlet-outlet reverse phenomenon at the lowest position of the outlet of the DVI extension duct. The feasibility of DVI+ has been tested to evaluate the LOCA performance using the CFX code. The test results show that it predicts the ECC water flows to the lower downcomer well and the ECC bypass fraction is very low
권태순(Tae-Soon Kwon),정우성(Woo-Sung Jung),권성태(Sung-Tae Kwon),이종범(Jong-Beom Lee),김희만(Hee-Man Kim),강성해(Sung-Hae Kang) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Reduction of CO₂ emission is one of major issues in the whole industries, especially transport system. Railroad companies in the advanced countries such as EU, Japan, etc. have made great efforts on the improvement of their systems including energy sources, operational efficiency and PR of achievement resulted. Recently, to emphasize the environment-friendly characteristics of the railroad as public transport, the importance of PR is emerging. The achievements were listed in annual, sustainability and corporate responsibility reports. And the superiority of railroad in CO₂ emission can be confirmed in web sites and simple advertizing materials. In this study, we proposed the PR programs of achievement and ongoing works in Korean railroad through the case studies on web-based and off-line programs of railroad companies in EU and Japan.