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Hao-Yang Song,오광중,전수빈,Se-Yong Jang,이상섭,Seong-Kuy Kang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.7
In our previous study, a high CO2 absorption rate was achieved using a blended absorbent containing AMP,NH3, and TEA. The species of the blended absorbent was determined in this study using 13C nuclear magnetic resonance(NMR) spectroscopy and a modified Kent-Eisenberg model. The carbamate formation constant was also regressedusing the model. Bicarbonate and carbonate ions decrease the absorption efficiency and have a positive effect on CO2stripping. Carbamate has a negative effect on regeneration; a regeneration temperature of 373 K minimized the energyneeded. In conclusion, the prediction equation and NMR analysis provide an easy way of determining carbonate groupspecies and carbamate species concentrations, and this method will be helpful in optimizing CO2 capture with blendedabsorbents.
Synchronous Ectopic Pancreatoblastoma in a Child: A Case Report
Zhi-Hao Yang,Jian-Bo Gao,Song-Wei Yue,Xue-Hua Yang,Hua Guo 대한의학회 2011 Journal of Korean medical science Vol.26 No.6
Pancreatoblastoma is a rare primary pancreatic neoplasm of children that may arise in any portion of the pancreas. We report a case of a 3-yr-old boy who presented to with abdominal pain our hospital and a progressive bulge in his right abdomen. Biochemical evaluation and serum levels of tumoral markers were within reference limits. On the computed tomography, two tumors were found. One located in the head of the pancreas;however, a laparotomy revealed that the head of pancreas was compressed but normal. The other was in the left abdomen near the spleen and the tail of the pancreas. The diagnosis of two synchronous pancreatoblastoma originating from the omentum was confirmed by pathology. Therefore, a pancreatoblastoma should be considered when a large well-defined, lobulated, and heterogeneous mass is identified in the pancreas of children. In addition, an ectopic pancreatoblastoma should be considered when identified within or near the ectopic pancreatic tissue.
페로니켈 슬래그로 부터 제조된 Mg(OH)₂를 이용한 CO₂ 고정화
송호양(Hao-Yang Song),서종범(Jong-Beom Seo),강성규(Seong-Kuy Kang),김인득(In-Deuk Kim),최봉욱(Bong-Wook Choi),오광중(Kwang-Joong Oh) 한국청정기술학회 2014 청정기술 Vol.20 No.1
본 논문은 페로니켈 슬래그를 이용하여 간접적으로 CO₂를 고정화시키는 기술에 대한 연구를 하였으며, 효율적으로 Mg를 추출하여 제조된 Mg(OH)₂의 CO₂ 고정화 최적 조건을 제시하고자 하였다. 실험 결과, 최적의 추출조건은 1 M H₂SO₄, 반응온도 333 K이었으며, 용출액에 NaOH를 첨가하여 pH값을 8까지 높일 경우, 침전물은 Fe₂O₃로 확인되었다. 또한 pH 값이 11까지 높아질 때 , 그 성분은 Mg(OH)₂로 나타났다. 이렇게 제조된 Mg(OH)₂ slurry 용액을 CO₂ 고정화실험에서 준 2차 탄산화반응 모델을 통해 적용한 결과, 반응온도 및 초기 CO₂분압에 따라 초기 CO₂의 고정화 속도를 증진할 수 있는 반면 반응온도가 323 K 이상 높아질 경우, 고정화속도가 감소하는 것으로 나타났다. 또한 CO₂고정화반응 시 이온을 조사한 결과, CO₂를 고정화 할 수 있는 최적의 pH 조건으로 8.38 이상 유지해야 할 것으로 판단되었다. 종합적으로 본 연구에서는 페로니켈 슬래그를 이용하여 CO₂를 고정화하기 위한 최적의 조건을 도출하였으며, 향후 CO₂를 고정화 하기 위한 연구의 기초자료로 활용할 수 있을 것으로 판단된다. In this study, the Mg(OH)₂ slurry was made form ferro-nickel slag and then used for CO₂ sequestration. The experiments were in the order as leaching step, precipitation, carbonation experiments. According to the leaching results, the optimal leaching conditions were H₂SO₄ concentration of 1 M and the temperature of 333 K. In the Mg(OH)₂ manufacturing step, NaOH was added to increase the pH upto 8, the first precipitation was confirmed as Fe₂O₃. After removal the first precipitation, the pH was upto 11, the Mg(OH)2 was generated by XRD analysis. The Mg(OH)₂ slurry was used for CO₂ sequestration. The pseudo-second-order carbonation model was used to apply for CO₂ sequestration. The CO₂ sequestration rate was increased by the CO₂ partial pressure and temperature. However, CO₂ sequestration rate was decreased when temperature upto 323 K. After CO₂ sequestrated by Mg(OH)₂, the CO₂ can be sequestrated stable as MgCO₃. This study also presented optimal sequestration condition was the pH upto 8.38, the maximum MgCO₃ can be generated. This study can be used as the basic material for CO₂ sequestration by ferro-nickel slag at pilot scale in the future.
Further Education for Asian University Sports: AUSF Education and Development Centre
( Hao Cheng ),( Pei Liu ),( Jian Wang ),( Tieli Yang ),( Jun Xie ),( Bingshu Zhong ),( Qing Song ),( Cheng Fave Seetow ),( Yuetong Yan ),( Zhen Shen ),( Yanqing Xue ),( Kunning Chen ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1
Hao Fang,Chen Zhao,Xiang-Yang Song,Mu Chen,Zheng Chang,Jie Chu 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.2
Two improvement approaches comprising of a mixed culture of Trichoderma reesei and Aspergillus niger and the addition of surfactants were employed in this study in order to enhance cellulolytic enzyme production as well as to improve the composition. Different delay times of A. niger inoculation (0, 24, and 48 h) and inoculum ratios of T. reesei versus A. niger (1:1 and 5:1) derived six mixed culture forms, which were 0 h/1:1, 0 h/5:1, 24 h/1:1, 24 h/5:1,48 h/1:1, and 48 h/5:1. It was found that the form 48 h/5:1allowed the highest FPA, 3.30 ± 0.34 IU/mL, and a relatively high BGA, 1.01 ± 0.25 IU/mL, thereafter being selected for the subsequent improvement step addition of surfactants. Among the three surfactants, including Triton X-100, CHAPS and sodium taurocholate, the third one was found to be the best one giving rise to the highest FPA and BGA, 5.02 ± 0.40 and 1.48 ± 0.28 IU/mL, respectively. Differently sourced cellulases were compared in the enzymatic hydrolysis of steam-exploded corn stover (SECS). Moreover, the cellulase produced by the mixed culture form 48 h/5:1 using SECS as a substrate showed the highest yield at 80.93 ± 2.04%, indicating that the composition of this cellulase was improved by the mixed culture of T. reesei and A. niger. The results validate that these two improvement approaches are efficient and applicable in cellulase production.
Yang Li,Jianxin Fu,Nai Hao,Weidong Song,Ling Yu 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.5
With the increasing depletion of shallow-earth mineral resources, deep mining will become the primary route of future mineral resources development. However, deep mining technology is a long way from being mature, and there are still a great number of issues that severely limit the growth of resources. In this paper, the acoustic emission (AE) tests of triaxially loaded and unloaded deep diorite are conducted. The results show that when confining pressure is at a low level, the failure mode of rock sample is mainly tension fracture; however as confining pressure increases, the failure mode gradually changes to shear failure. Under different stress paths, AE counting characteristics can be separated into four stages, including initial low-energy zone, pre-peak quiet zone, peak sudden burst zone and post-peak failure intensive zone (post-peak fast attenuation zone or post-peak high density zone). The damage variable is defined as the ratio of the AE count rate of a certain stage to the cumulative AE count rate of the failure process, and it accounts for the largest proportion at the stage of unloading confining pressure. In addition, when confining pressure increases, thedamage variable changes from a flat growth to a rapid growth, with the abrupt transition occurring around the peak stress.
Cheng-Hao Jin,Ung Yang,Song-Hee Kim,Jae-Won Ryu,Jae-Chang Lee,Dong-Seok Lee,Tae-Hoon Lee 한국식품과학회 2007 Food Science and Biotechnology Vol.16 No.4
In this study, we evaluated whether the oral administration of chondroitin from the cartilage of Raja kenojei is effective on the progression of rheumatoid arthritis (RA), using collagen-induced arthritic (CIA) mice. Arthritis development was delayed dose-dependently in the chondroitin-treated groups. The pre- and late-treated groups receiving 1,000 mg/kg of chondroitin had clinical scores that were reduced significantly by 56.9 (p<0.05) and 43.3% (p<0.05), respectively, compared to the vehicle-treated groups. Hematoxylin eosin staining and X-ray radiography showed that the chondroitins reduced the infiltration of inflammatory cells and prevented joint destruction of the knee and paw. Reverse transcription-polyerase chain reaction analysis revealed that chondroitin administration inhibited the expressions of tumor necrosis factor-α (TNF-α), interlukin-1β (IL-1β), and interferon-γ (IFN-γ) in joints more than the administration of vehicle. Chondroitin treatment also decreased the production of rheumatoid factors (RF), IgG and IgM, in the serum of CIA mice. These results indicate that chondroitin administration has a protective effect involving the inhibition of pro-inflammatory cytokine production in CIA mice.
Xiao Song,Tong Mengyuan,Rao Yang,Li Yuhang,Ye Zhizong,Shen Yixiang,Hou Hao,Gao Guoqiang,Wu Guangning,Jin Yaoyao,Zhou Jie,Liu Jie 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
Along with the operating velocity and traction power increasing continuously, the issue related to the safety and reliability of the high-voltage traction power system for high-speed trains have gradually been exposed during the practical service process. When the train passes a neutral section settled roughly per 15 km between two neighboring substations, the on-board vacuum circuit breaker (VCB) must to be operated for changing the input powers with diff erent phases. At the moment of switching on or off the VCB, the arc between the contacts in the arc-extinguishing chamber may be triggered, which tends to result in the operational overvoltage. Due to numerous inductances and capacitances existing in the traction power supply system, the overvoltage may lead to high-frequency electromagnetic oscillation spreading along the transmission routes. The on-board high-voltage equipments within the power supply system may suff er from the impulse brought from the VCB operational overvoltage frequently, which is possible to cause the insulation aging or breakdown issue. To investigate the characteristic of the operational overvoltage of VCBs, a ‘train-rail-catenary’ power supply model is built based on the measured impedance parameters, which has been verifi ed by the experimental tests. The generating mechanism with the infl uence factors of the operational overvoltage when switching on or off the VCB has been explored, meanwhile the distribution of the train body overvoltage on each carriage has also been presented.
( Xue Song Gao ),( Qi Wang ),( Wei Li ),( Biao Yang ),( Hao Song ),( Wei Ju ),( Shu Nai Liu ),( Jun Cheng ) 생화학분자생물학회(구 한국생화학분자생물학회) 2011 BMB Reports Vol.44 No.1
Nucleolar and coiled-body phosphoprotein 1 (NOLC1) is a phosphoprotein that transiently associates with the mature nucleolar H/ACA and C/D box small nucleolar ribonucleoproteins (snoRNPs). Several lines of evidence indicate that NOLC1 plays an important role in the synthesis of rRNA and the biosynthesis of ribosomes. In the present study, we examined the transcriptional regulation mechanisms that govern the expression of NOLC1. We first performed functional dissection of the NOLC1 promoter. We demonstrated that transcription factors NF-κB and CREB could bind to the minimal NOLC1 promoter. This was demonstrated by electrophoretic mobility shift assays and chromatin immunoprecipitation. Mutagenesis and overexpression assays revealed that NF-κB and CREB positively regulated the NOLC1 promoter. These findings may provide new insight into the mechanisms that regulate NOLC1 expression. [BMB reports 2011; 44(1): 70-75]