http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Acute Shunt Malfunction Caused by Percutaneous Endoscopic Gastrostomy without Shunt Infection
Choi, Jingyu,Ki, Seung Seog,Park, Seoungwoo The Korean Neurosurgical Society 2014 Journal of Korean neurosurgical society Vol.56 No.4
Percutaneous endoscopic gastrostomy tube placement is often performed in patients with a ventriculoperitoneal shunt and it has been accepted as a safe procedure. The authors report a case of a 50-year-old male who developed acute exacerbation of the hydrocephalus immediately after the percutaneous endoscopic gastrostomy tube placement without any signs of shunt infection, which has not been reported until now. After revision of the intraperitoneal shunt catheter, the sizes of the intracranial ventricles were normalized.
Juhee Lee(이주희),Seoungwoo Choi,Yeomyeong Lee,Hyerin An,Sang Yoon Kim 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Ammonia (NH₃) volatilization is one of the major nitrogen (N) losses from rice paddies, which leads to low crop productivity lowering N use efficiency as well as deteriorating environmental air quality. Comparing to urea, ammonium sulfate can decrease the soil and water pH, which may reduce NH₃ volatilization loss in rice paddy soils. However, its impact of ammonium sulfate of NH₃ volatilization has been largely unexplored in paddy fields. In this study, the field study was conducted to investigate NH₃ volatilization in rice paddy soils amended with different type of N fertilizers, urea [(NH₂)₂CO], and ammonium sulfate [(NH₄)₂SO₄], at a rate of 0 (PK, control), 45, 90, and 180 kg N ha<SUP>-1</SUP> before the rice transplanting. Moreover, biochemical properties including extractable NH₄<SUP>+</SUP>-N in soils and irrigation water including pH, EC were investigated during cultivation. Application of both N fertilizers significantly increased the amount of NH₃ volatilization as compared to control. NH₃ emissions significantly increased with increasing N application levels, irrespective of types of fertilizers. Ammonium sulfate application effectively reduced NH₃ volatilization, which showed approximately 5 times lower emission than the urea application. In particular, ammonium sulfate application significantly reduced pH at the initial rice cultivation season, but increased EC in irrigation water. Soil NH₄<SUP>+</SUP>-N contents were higher in ammonium sulfate amended soils than the urea applications. This result indicates that more soil NH₄<SUP>+</SUP>-N was released in ammonium sulfate treatment, but NH₃ volatilization was suppressed in the surface water due to its lower pH condition, showing effective reduction of NH₃ emissions. In conclusion, ammonium sulfate application could be considered a promising way to effectively mitigate NH₃ volatilization in rice paddies.
Song, Jihun,Shin, Dong Ok,Byun, Seoungwoo,Roh, Youngjoon,Bak, Cheol,Song, Juhye,Choi, Jaecheol,Lee, Hongkyung,Kwon, Tae-Soon,Lee, Young-Gi,Ryou, Myung-Hyun,Lee, Yong Min The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.2
The microblade cutting method, so-called SAICAS, is widely used to quantify the adhesion of battery composite electrodes at different depths. However, as the electrode thickness or loading increases, the reliability of adhesion values measured by the conventional method is being called into question more frequently. Thus, herein, a few underestimated parameters, such as friction, deformation energy, side-area effect, and actual peeing area, are carefully revisited with ultrathick composite electrodes of 135 ㎛ (6 mAh cm<sup>-2</sup>). Among them, the existence of side areas and the change in actual peeling area are found to have a significant influence on measured horizontal forces. Thus, especially for ultrahigh electrodes, we can devise a new SAICAS measurement standard: 1) the side-area should be precut and 2) the same actual peeling area must be secured for obtaining reliable adhesion at different depths. This guideline will practically help design more robust composite electrodes for high-energy-density batteries.
펄스 측정법에 기반한 리튬이차전지 출력 측정에 관한 전산 모사
박주남,변승우,한세경,최진혁,유명현,이용민,Park, Joonam,Byun, Seoungwoo,Appiah, Williams Agyei,Han, Sekyung,Choi, Jin Hyeok,Ryou, Myung-Hyun,Lee, Yong Min 한국전력공사 2015 KEPCO Journal on electric power and energy Vol.1 No.1
시간대별 효율적인 전력 운영과 전력품질 향상을 위해 ESS (Energy Storage System)의 보급이 세계적으로 활발하게 이루어지고 있다. 이러한 ESS용 전원소자로 리튬이차전지의 채용이 급격히 늘어남에 따라, 리튬이차전지의 수명 및 출력 열화 거동을 측정 및 예측하는 기술이 시급히 요구되고 있다. 특히, ESS 운영에 있어 핵심 특성인 리튬이차 전지 출력은 측정이 어려울 뿐만 아니라, 정확한 측정을 위해서는 많은 시간이 소요되는 문제점이 있다. 따라서, 본 연구에서는 ESS용 리튬이차전지 단전지를 전산 모델링 한 후, 펄스 측정법을 적용하여 충전상태에 따른 방전 및 충전시의 직류저항(DC-IR)과 출력을 예측한다. 또한, 두 가지 펄스 측정법인 HPPC (Hybrid Pulse Power Characteristics)와 J-Pulse (JEVS D 713, Japan Electric Vehicle Association Standards)의 결과를 비교 분석한다. Energy storage systems (ESSs) have been utilized widely in the world to optimize the power operation system and to improve the power quality. As lithium secondary batteries are the main power supplier for ESSs, it is very important to predict its cycle and power degradation behavior. In particular, the power, one of the hardest electrochemical properties to measure, needs lots of resources such as time and facilities. Due to these difficulties, computer modelling of lithium secondary batteries is applied to predict the DC-IR and power value during charging and discharging as a function of state of charge (SOC) by using pulse-based measurement methods. Moreover, based on the hybrid pulse power characteristics (HPPC) and J-Pulse (JEVS D 713, Japan Electric Vehicle Association Standards) methods, their electrochemical properties are also compared and discussed.