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Cho, Joon-Hyung,Jeon, Soo-Bin,Kang, Min-Kyoung,Kim, Jin-Seop,Cho, Sang-Won,Oh, Kwang-Joong Elsevier 2017 Separation and purification technology Vol.184 No.-
<P><B>Abstract</B></P> <P>Ion exchange technology is the most effective and economical to remove heat stable salts (HSS) in CO<SUB>2</SUB> absorption processes. However, the disadvantage of high waste generation remains an unsolved problem. This study attempted to reduce the amount of waste generated during the Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regeneration process through resource recovery by using ZrCl<SUB>4</SUB> coagulant, then recycling the recovered Zr(OH)<SUB>4</SUB> precipitate to produce Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regenerant. The experimental results showed a waste coagulant efficiency of about 75%. The coagulation mechanism was suggested based on the conductivity and zeta potential analysis. The recovered Zr(OH)<SUB>4</SUB> had no differences in terms of chemical composition and regeneration efficiency, when compared with virgin material. These results indicate that the recovery and recycling of Zr(OH)<SUB>4</SUB> from the waste stream using ZrCl<SUB>4</SUB> as a coagulant reduced a large amount of the waste generated from the ion exchange process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reduction efficiency using ZrCl<SUB>4</SUB> coagulant from ion exchange waste is about 75.0%. </LI> <LI> Coagulation mechanism of four stages with respect to the coagulant dose is proposed. </LI> <LI> Recovery efficiency of hydroxide, as Zr(OH)<SUB>4</SUB>, from the waste is about 99.2%. </LI> <LI> The recovered Zr(OH)<SUB>4</SUB> has no difference in regeneration efficiency of virgin material. </LI> </UL> </P>
Cho, Joon-Hyung,Jeon, Soo-Bin,Yang, Kyeong-Soon,Seo, Jong-Beom,Cho, Sang-Won,Oh, Kwang-Joong Elsevier 2015 Separation and purification technology Vol.156 No.2
<P><B>Abstract</B></P> <P>In the CO<SUB>2</SUB> absorption process, heat stable salts (HSS) have been reported to be a major cause of operational problems, such as excessive foaming, corrosion, amine loss, and capacity reduction. Ion exchange technology has been the most effective and economical way for the removal of HSS. However, the disadvantage of this technology is its low regeneration efficiency. This study attempted to improve the low regeneration efficiency of anion exchange resin loaded with HSS by using a novel zirconium pentahydroxide (ZrOH<SUB>5</SUB> <SUP>−</SUP>) displacement technique. The experimental results showed, in the batch system, that the most effective potential metal-hydroxide regenerant, Zr(OH)<SUB>5</SUB> <SUP>−</SUP>, exhibited an efficiency that is 15.2% higher than for conventional NaOH, and in the continuous system, Zr(OH)<SUB>5</SUB> <SUP>−</SUP> had an efficiency that is 28.0–17.8% higher for 1.5–5bed volume (BV). The differences of the BV corresponded to the breakthrough point for the initial breakthrough and after the 1st and 2nd regenerations were only 1.5–3.9%, which means that there was no significant deterioration of the resin’s performance by Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regeneration. The mechanism of the general ion exchange steps as well as the regeneration by Zr(OH)<SUB>5</SUB> <SUP>−</SUP> was determined by performing an FT-IR analysis. These results indicate that the novel Zr(OH)<SUB>5</SUB> <SUP>−</SUP> displacement technique improves the low regeneration efficiency of the ion exchange process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Zr(OH)<SUB>5</SUB> <SUP>−</SUP> is the most effective regenerant of the candidates that were tested. </LI> <LI> The Zr(OH)<SUB>5</SUB> <SUP>−</SUP> exhibits higher regeneration efficiency than for conventional NaOH. </LI> <LI> There is no significant deterioration of the resin’s performance by Zr(OH)<SUB>5</SUB> <SUP>−</SUP>. </LI> <LI> The regeneration mechanism for water structure enforced-ion pairing is proposed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jeon Ga Won,Ahn So Yoon,Kim Su Min,Yang Misun,Sung Se In,Sung Ji-Hee,Oh Soo-young,Roh Cheong-Rae,Choi Suk-Joo,Chang Yun Sil 대한의학회 2023 Journal of Korean medical science Vol.38 No.44
Background: Though antenatal magnesium sulfate (MgSO4) is widely used for fetal neuroprotection, suspicions about the long-term neuroprotection of antenatal MgSO4 have been raised. Methods: We investigated short- and long-term outcomes of antenatal MgSO4 use for 468 infants weighing < 1,500 g with a gestational age of 24–31 weeks. Results: Short-term morbidities and the risk of developmental delay, hearing loss, and cerebral palsy at a corrected age of 18–24 months and 3 years of age did not decrease in the MgSO4 group (infants who were exposed to MgSO4 for any purpose) or neuroprotection group (infants who were exposed to MgSO4 for fetal neuroprotection) compared with the control group (infants who were not exposed to MgSO4). The z-scores of weight, height, and head circumference did not increase in the MgSO4 group or neuroprotection group compared with the control group. Conclusion: Antenatal MgSO4 including MgSO4 for neuroprotection did not have beneficial effects on long-term neurodevelopmental and growth outcomes.
Oh, Mi Rae,Hong, Heeok,Li, Hong Liang,Jeon, Byong Tae,Choi, Cheong Hee,Ding, Yu Ling,Tang, Yu Jiao,Kim, Eun Kyung,Jang, Se Young,Seong, Hye Jin,Moon, Sang Ho Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.12
The objective of this study was to determine the effects of physically effective neutral detergent fiber (peNDF) content in total mixed ration (TMR) on dry matter intake, digestibility, and chewing activity in fattening Hanwoo (Bos taurus coreanae) heifers. The experiment was designed as a replicated $3{\times}3$ Latin square using 12 heifers. Fattening heifers were offered one of three diets [high (T1), medium (T2), and low (T3) peNDF] obtained by different mixing times (3, 10, and 25 min) for the same TMR feed. The peNDF content of TMR was determined by multiplying the proportion of dry matter retained by a 1.18 mm-screen in a Penn State Particle Separator by the dietary NDF content. The $peNDF_{1.18}$ content was 30.36%, 29.20%, and 27.50% for the T1, T2, and T3 diets, respectively (p<0.05). Dry matter intake was not affected by peNDF content in TMR. Total weight gain in T1 group was significantly higher (p<0.05) than in T2 and T3 groups. However, weight gain did not differ between T2 and T3 groups. The feed conversion ratio decreased with an increase in the peNDF content (T1: 12.18, T2: 14.17, and T3: 14.01 g/g). An increase in the peNDF content of TMR was associated with a linear increase in the digestibility of dry matter, crude protein, crude fiber, neutral detergent fiber, and acid detergent fiber (p<0.05). Also, an increase in peNDF content of the TMR resulted in a linear increase in the number of chews in eating and ruminating (p<0.05), and consequently in the number of total chews (p<0.05). These results indicate that peNDF content affects digestibility and chewing activity. Consequently, the peNDF content of TMR should be considered for improving feed efficiency, digestibility, body weight gain, and performance in fattening heifers.
Jeon, Jin Pyeong,Cho, Won-Sang,Kang, Hyun-Seung,Kim, Jeong Eun,Kim, Seung-Ki,Oh, Chang Wan The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.57 No.2
Objective : Elevated cellular retinoic acid binding protein-I (CRABP-I) is thought to be related to the abnormal proliferation and migration of smooth muscle cells (SMCs). Accordingly, a higher CRABP-I level could cause disorganized vessel walls by causing immature SMC phenotypes and altering extracellular matrix proteins which could result in vulnerable arterial walls with inadequate responses to hemodynamic stress. We hypothesized that elevated CRABP-I level in the cerebrospinal fluid (CSF) could be related to subarachnoid hemorrhage (SAH). Moreover, we also extended this hypothesis in patients with vascular malformation according to the presence of hemorrhage. Methods : We investigated the CSF of 26 patients : SAH, n=7; unruptured intracranial aneurysm (UIA), n=7; arteriovenous malformation (AVM), n=4; cavernous malformation (CM), n=3; control group, n=5. The optical density of CRABP-I was confirmed by Western blotting and presented as mean${\pm}$standard error of the measurement. Results : CRABP-I in SAH ($0.33{\pm}0.09$) was significantly higher than that in the UIA ($0.12{\pm}0.01$, p=0.033) or control group ($0.10{\pm}0.01$, p=0.012). Hemorrhage presenting AVM (mean 0.45, ranged 0.30-0.59) had a higher CRABP-I level than that in AVM without hemorrhage presentation (mean 0.16, ranged 0.14-0.17). The CRABP-I intensity in CM with hemorrhage was 0.21 and 0.31, and for CM without hemorrhage 0.14. Overall, the hemorrhage presenting group (n=11, $0.34{\pm}0.06$) showed a significantly higher CRABP-I intensity than that of the non-hemorrhage presenting group (n= 10, $0.13{\pm}0.01$, p=0.001). Conclusion : The results suggest that elevated CRABP-I in the CSF could be related with aneurysm rupture. Additionally, a higher CRABP-I level seems to be associated with hemorrhage development in vascular malformation.
Oh, Hyun-Jeong,Ahn, Hyo-Min,So, Kyoung-Ha,Kim, Sang-Suk,Yun, Pil-Yong,Jeon, Gyeong-Lyong,Riu, Key-Zung The Korean Society for Applied Biological Chemistr 2007 Journal of Applied Biological Chemistry (J. Appl. Vol.50 No.3
Three coniferous essential oils were extracted from Abies koreana, Cryptomeria japonica, and Torreya nucifera by hydrodistillation. The chemical composition of each oil was analyzed by GCMS, and their antimicrobial activities were tested against two bacteria and one yeast strains. Fortyseven compounds were identified from A. koreana oil, 39 from C. japonica, and 59 from T. nucifera. Main components of the essential oils were limonene (23.5%), bornyl acetate (17.9%), ${\alpha}-pinene$ (11.1%), and camphene (10.2%) in A. koreana, kaurene (26.3%), ${\gamma}-eudesmol$ (19.0%), elemol (6.9%), and sabinene (5.1%) in C. japonica, limonene (13.5%), ${\delta}-cadinene$ (10.5%), ${\alpha}-bisabolol$ (10.2%), and ${\alpha}-copaene$ (7.7%) in T. nucifera. Among the three coniferous trees tested, the essential oils of A. koreana exhibited higher and broader antimicrobial activity against the tested organisms than those of C. japonica and T. nucifera.