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브레이크 로봇을 활용한 제동안정성평가 신뢰성 향상방안 연구
조성우(Seongwoo Cho),최인성(Inseong Choi),안장모(Jangmo Ahn),김성섭(Seongsub Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The Korean New Car Assessment Program (KNCAP) has been carried out by the Korean government since 1999 in order to encourage that the auto makers shall launch the safer cars into the domestic market. The brake NCAP test has been adopted to reduce the stopping distance. Braking tests were performed with pedal force applied by driver/robot individually and their effects upon pedal force requirements were analyzed. The differences of stopping distance were significantly shorter with pedal force applied by brake robot compared to pedal force applied by driver. Accordingly, this study evaluated the effectiveness of brake robot that will reduce the deviation of stopping distances through pedal force requirements of brake NCAP. The methodology to integrate the respective ratings from the braking tests considering environmental variables would be studied for the future application.
부산도시철도 1호선의 라돈농도 분포 및 특성에 관한 연구
최성우(Seongwoo Choi),차영욱(Youngwook Cha),조영만(Youngman Cho),조정구(Jeonggu Cho) 대한환경공학회 2020 대한환경공학회지 Vol.42 No.1
목적 : 실내 라돈은 제한된 공간에서 인체 건강에 심각한 악영향을 미친다. 도시철도 역사 대부분은 지하공간에 위치하고, 지하철과 같은 지하공간은 라돈성분이 증가하는 것으로 알려져 있다. 방법 : RAD-7을 이용하여 지하철 1호선에서 실내공기의 라돈농도를 연속측정하였다. 결과 및 토의 : 측정 결과 40개 지하철역에 측정한 평균 라돈농도는 8.9 Bq/m³이었으며, 심도가 깊은 지하역사에서 상대적으로 높은 라돈농도가 측정되었다. 지하철 운행이 중단되고 환기시설이 가동되지 않는 0시에서 5시에 라돈농도가 증가하였고, 승강장과 대합실에서 측정한 평균 라돈농도는 온도가 낮을수록 높은 것으로 나타났다. 결론 : 부산 지하철 1호선은 비화강암 지역에 위치하여 상대적으로 낮은 라돈농도가 나타났다. Objective : Adverse health effects of Radon with a particular focus on indoor environment has been outlined. Most of the metro stations and platforms are situated under the ground where relatively enhanced concentration of radon has been observed. Method : On-line measurements of indoor Radon have been made in Metro Line 1 in Busan using RAD-7. Results and Discussion : The average concentration of Radon was 8.9 Bq/m³ (n=40). In general, a positive relation was shown between the level of radon and the depth of station. Slightly enhanced radon concentrations were observed between 0 a.m. ~ 5 a.m. when the station is closed under the non-operation of ventilation system. Interestingly, the negative relation was seen between the radon revel and temperature. Conclusions : Relatively low levels of indoor radon has been observed in Metro Line 1 in Busan, which may be associated with geographical location of non-granite regions.
Cho, Sangeun,Lee, Seongwoo,Hou, Bo,Kim, Jongmin,Jo, Yongcheol,Woo, Hyeonseok,Pawar, Sambhaji M.,Inamdar, Akbar I.,Park, Youngsin,Cha, SeungNam,Kim, Hyungsang,Im, Hyunsik Pergamon Press 2018 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>Mesoporous Ni-Co oxide (NCO) nanosheet electrodes are fabricated on Ni foam via an electrodeposition technique. Their bifunctional activities for electrochemical energy storage and electro-catalysis for water splitting in strong alkaline media are optimized by varying the ratio of concentrations of the Ni and Co precursors. The ratio-based changes vary the pore size of the NCO nanosheets between 92.5 and 200 nm, and structural analyses reveal that the electrode films have a spinel NiCo<SUB>2</SUB>O<SUB>4</SUB> structure. The obtained specific capacitance varies dramatically between 613 and 2704 Fg<SUP>−1</SUP> at 2 mA cm<SUP>−2</SUP>, with good capacity retention (80–90%) after 2000 cycles. The NCO nanosheet electrodes also exhibit a good oxygen evolution reaction at the surface. The lowest overpotential (315 mV at 10 mA cm<SUP>−2</SUP>) is obtained with a Tafel slope of 59 mV dec<SUP>−1</SUP>. The observed bifunctional activities of the new NCO nanosheet electrode are superior to those of nanostructured NCO electrodes prepared via hydrothermal and SILAR methods. The analyses regarding the electrochemically active surface area and electrochemical impedance spectroscopy, together with the observed electrochemical performance, reveal that the most-optimized Ni and Co composition produces the synergetic effects of an electrochemically active surface area and great stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mesoporous Ni-Co oxide (NCO) nanosheet electrodes are fabricated on Ni foam via an electrodeposition technique. </LI> <LI> Excellent specific capacitance and electrochemical stability are obtained. </LI> <LI> The overpotential of 315 mV at 10 mA cm<SUP>−2</SUP> is obtained with a Tafel slope of 59 mV dec<SUP>−1</SUP>. </LI> </UL> </P>
Seongwoo Choi,Juhee Lee,Yeomyeong Lee,Pil Joo Kim,Ju-Sik Cho,Yong Hwa Cheong,Yo-Sup Rim,Sang Yoon Kim 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4
Ethephon is one of the chemical stimulator of crop growth that is also considered as a structural analogue of coenzyme M (CoM), having a promising potential for methanogenic inhibitor. However, the effect of ethephon application on greenhouse gas (GHG) emissions under rice cultivation has not been studied yet. In this pot experiment, different levels of ethephon (0, 2.5, 5 and 10 ㎎ L<SUP>-1</SUP>) were applied at the presence or absence of manure compost as an organic amendment to study its effect on GHGs emissions in particular CH₄ and rice productivity during the cultivation. Application of ethephon effectively suppressed CH₄ emissions in particular the initial periods (ca. 3 weeks) right after the application as compared with control soil during rice cultivation, but did not significantly affect N₂O emissions. In addition, the maximum CH₄ reduction (82% reduction over control) was found at 10 ㎎ L<SUP>-1</SUP> ethephon application right after its addition for 3 weeks during rice cultivation. Rice productivity and yield properties were mainly affected by ethephon application, enhancing ripened grains and number of grains per panicle. Soil properties were not influenced by ethephon application except for available phosphate, which is probably due to enhanced root growth in rhizosphere soils. Conclusively, ethephon could be a new and pioneering amendment for reducing CH₄ emission in particular at the initial 3 weeks after the application without increasing other GHG emissions and enhancing rice productivity in paddy soils.