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Kim, Sangjae,Matsunaga, Naoya,Kuroda, Kensuke,Okido, Masazumi The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.1
Aluminum electrodeposition was carried out in dimethylsulfone ($DMSO_2$) baths containing 6.2-28.3 mol% $AlCl_3$ at 403 K. The electrochemically active species for Al electrodeposition in $DMSO_2$ baths were investigated. Electrochemical behavior of the electrolyte and the deposition mechanism were studied via cyclic voltammetry (CV). Properties of the deposits were assessed by scanning electron microscopy with energy-dispersive X-ray spectroscopy and X-ray diffraction. In addition, structures of the ionic complexes formed with aluminum in the bath were characterized by $^{27}Al$ nuclear magnetic resonance (NMR) spectroscopy. NMR spectra revealed that all baths contained two ionic species: $AlCl_4{^-}$ and $[Al(DMSO_2)_3]^{3+}$. Al electrodeposited when the $[Al(DMSO_2)_3]^{3+}$ concentration was the highest (23.3 mol% $AlCl_3$) exhibited fine grain sizes, relatively smooth surfaces, and high purities.
Novel Peptide Vaccine GV1001 Rescues Hearing in Kanamycin/Furosemide-Treated Mice
Kim, Shin Hye,Jung, Gaon,Kim, Sangjae,Koo, Ja-Won Frontiers Media S.A. 2018 Frontiers in cellular neuroscience Vol.12 No.-
<P>The cell-penetrating peptide GV1001 has been investigated as an anticancer agent and recently demonstrated anti-oxidant and anti-inflammatory effects. It has shown a protective effect on a kanamycin (KM)-induced ototoxicity mouse model. In the present study, we administered GV1001 at different time points after inducing hair cell damage, and examined if it rescues hair cell loss and restores hearing. A deaf mouse model was created by intraperitoneal injection of KM and furosemide. First, to test the early temporal change of hearing and extent of hair cell damage after KM and furosemide injection, hearing and outer hair cells (OHCs) morphology were evaluated on day 1, day 2 and day 3 after injection. In the second experiment, following KM and furosemide injection, GV1001, dexamethasone, or saline were given for three consecutive days at different time points: D0 group (days 0, 1, and 2), D1 group (days 1, 2, and 3), D3 group (days 3, 4, and 5) and D7 group (days 7, 8, and 9). The hearing thresholds were measured at 8, 16, and 32 kHz before ototoxic insult, and 7 days and 14 days after KM and furosemide injection. After 14 days, each turn of the cochlea was imaged to evaluate OHCs damage. GV1001-treated mice showed significantly less hearing loss and OHCs damage than the saline control group in the D0, D1 and D3 groups (<I>p</I> < 0.0167). However, there was no hearing restoration or intact hair cell in the D7 group. GV1001 protected against cochlear hair cell damage, and furthermore, delayed administration of GV1001 up to 3 days rescued hair cell damage and hearing loss in KM/furosemide-induced deaf mouse model.</P>
Kim, Sungbum,Lee, Sangjae,Jeong, Seongkyeong,Lim, Myunghee,Song, Youngil,Ahn, Euisan,Jeong, Hoyong,Kim, Najin,Lee, Hyunjoo,Choi, Sungwoon 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.1
지난 3년('13~'15)간 화학물질사고는 301건이 발생하였으며, 연평균 약 100건이 집계됐다. 이와 같은 화학사고는 인명과 환경에 많은 피해를 가져왔다. '13년~'15년에 발생한 운반차량 화학사고는 연평균 21건으로 전체 화학사고의 약 21%를 차지한다. 화학물질 운반차량의 사고는 지역에 관계없이 도로상에서 발생하고 있기 때문에, 관계기관의 대응 및 사후처리 등 체계적인 현장조사가 필요하다. 또한 화학물질 운반업자 및 화물주 등의 협조가 절대적으로 필요한 상황이다. 따라서, 본 논문에서는 화학물질 운반차량의 사고발생에 대한 현장조사 및 처리 절차를 조사 분석하였다. 이를 통해 운반차량의 화학사고에 대한 원인을 분석하고 현장조사와 처리절차를 체계적으로 마련하는 기초자료가 될 것으로 판단된다. 301 cases of chemical accidents occurred during the recent three years('13~15) recording about 100cases on average in Korea.. Chemical accidents has brought casualties and negative impact on the environment. The chemical accident by transporting vehicles during recent 3 years records 21 on average & takes about 21% of the whole chemical accident. Systematic investigation on chemical accident was needed by corresponding authorities since the transport accident has occurred on the road, all over the nation. For the systematic investigation on the accident scene by the corresponding authorities, the cooperation of transport companies and transport contractor is highly necessary. The investigation of such accident scene was examined and analyzed in this study. Through this study, the results can be basis to analyzed the cause of chemical accident by transporting vehicles and to prepare procedures for on-site investigation and handling systematically.
Catalytic Gasification of Rice Husk using Coal Bottom Ash and Incineration Bottom Ash
( Sangjae Jeong ),( Taeho Lee ),( Young-min Kim ),( Seungdo Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
The demand for alternative energy is increasing rapidly due to global warming and the exhaustion of fossil fuels. Gasification is a technology for gaseous fuels by the incomplete combustion of waste or biomass. However, tar formed by incomplete combustion may cause plugging of gasifier and gas turbine. Therefore, tar reduction in the producer gas is an essential element. In this study, the catalytic gasification of rice husks was performed using a fluidized bed gasifier. To improve gas yield and reduce tar, coal bottom ash and incineration bottom ash were introduced as alternative materials. Gasification was carried out at 600℃, 700℃ and 800℃. Silica sand, dolomite, coal bottom ash, incineration bottom ash were used for bed materials. The ER (equivalence ratio), which is defined as the ratio of the actual fuel/air ratio to the stoichiometric fuel/air ratio, was set to 0.3. As the temperature increased, not only the yield of the gas, but also the concentration of H<sub>2</sub> and CO was increased. In addition, tar the producer gas was reduced. As a result of using alternative materials, although coal bottom ash didn’t show any significant differences compared to silica sand, dolomite and incineration bottom ash have been shown to be effective in improving the yield of H<sub>2</sub> and reducing tar content. This is expected to be due to the high content of alkaline earth metals (Ca, Mg) in dolomite and incineration bottom ash. Therefore, it is expected that incineration bottom ash can be used as a catalyst to replace dolomite.
An Adjustable Scheduling Algorithm for Multi-User MIMO Systems
KIM, Jaehong,LEE, Sangjae,KIM, Sehun The Institute of Electronics, Information and Comm 2009 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.92 No.2
<P>Multiple Input Multiple Output (MIMO) represents a highly promising technique for 4G communication networks as it uses multiple antennas at the transmitter and receiver to improve the reliability of transmissions and to provide a high data rate. This paper introduces an adjustable scheduling algorithm for multi-user MIMO systems that can provide an advantageous trade-off solution between throughput maximization and fair resource allocation among users. Specifically, our algorithm is proposed as a solution to system requirement issues through the flexible control of fairness factors.</P>