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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>
( Joon-bum Lee ),( Hyun-jae Joe ),( Byung-ho Oh ),( Young- Wook Ryoo ),( Sung-ae Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2
Background: Acanthosis nigricans(AN) is a velvety thickening of the epidermis, usually seen on nape, axillae, groin and inframammary folds. Also, AN is linked to obesity and insulin resistance. Major adipokines are known to be dysregulated in obesity and are key players in the pathogenesis of metabolic syndrome. We expected that various obesity-related factors in serum and skin structure were associated with AN patients. Objectives: The purpose of this study was to analyze the laboratory findings and histopathological features of obesity-related factors and to figure out correlation between disease and these factors in AN patients. Methods: Total 23 patients were included in this study. For laboratory analysis, a control group consisting of obese people was recruited and blood samples were collected for analysis of various obesity-related factors. For histopathological analysis, 11 patients with epidermal nevus showing similar clinical features were recruited, immunohistochemical staining of adipokine and leptin receptor was performed. Results: The median serum leptin of patient group was significantly higher than that of control group(p=0.021). Serum insulin growth factor-1 was also significantly higher in patient group(p=0.017). In immunohistochemical staining comparison, the patient groups shows significantly higher staining intensity in ObR(p=0.002). Conclusion: In conclusion, the serum leptin, IGF-1 titer and ObR expression in skin tissue are associated with AN patients.
Multiple Cavitary Pulmonary Nodules Caused by Mycobacterium intracellulare
Sang Hoon Yoo,Seo Ree Kim,Joon Young Choi,Jae Woo Choi,Yu Mi Ko,Sun Hee Jang,Jun Kyu Park,Ye Gyu Sung,Yun Jung Park,Su Yun Oh,Se Young Bahk,Ju Hyun Lee,Myung Sook Kim 대한가정의학회 2016 Korean Journal of Family Medicine Vol.37 No.4
Nontuberculous mycobacteria (NTM) have been increasingly recognized as an important cause of chronic pulmonary infections. The Mycobacterium avium complex (MAC), which is composed of two species, Mycobacterium avium and Mycobacterium intracelluare, is the most commonly encountered pathogen associated with NTM lung disease. MAC pulmonary infection typically presents in a fibrocavitary form or a nodular bronchiectatic form. However, there have been atypical presentations of MAC pulmonary infections, including solitary pulmonary nodules (SPN). There have been several previous reports of SPN due to MAC infection in the United States, Japan, and Korea. In 2009, Sekine and colleagues reported a case of MAC pulmonary infection presenting with multiple nodules. To date, however, there have been no cases of NTM lung infection with multiple cavitary pulmonary nodules, and neither a fibrotic change nor nodular bronchiectasis. The present case showed a multiple cavitating nodular lung infection due to MAC, which is very rare and different from the typical presentation of MAC pulmonary infections. We also showed that percutaneous transthoracic needle aspiration can be a useful diagnostic tool to evaluate a case of multiple cavitary nodules.
[P143] A refractory case of pemphigus vegetans
( Joon Bum Lee ),( Young Wook Ryoo ),( Byung Ho Oh ),( Sung Ae Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Pemphigus vegetans is a rare clinical form of pemphigus and is characterized by verrucous intertriginous plaques. There are two subtypes of pemphigus vegetans, characterized by flaccid bullae and erosions, the Neumann type or pustules, the Hallopeau type. In this case, a 43 years old woman visited us with a 6-month history of vegetating, papilomatous plaques on inguinal folds, axilla and erosions of the oral mucosa, perioral area. The cutaneous lesions started with vesicles and bullae, later formed the vegetating lesions. We diagnosed as the Neumann type pemphigus vegetans and treated her with systemic steroids and azathioprine. Despite the 3 years of treatment, the symptoms were not completely resolved. Herein, we report a rare case of the Neumann type pemphigus vegetans.
Sang-Joon Kim,Jong-Wan Bae,Hannah Oh 한국재무학회 2017 한국재무학회 학술대회 Vol.2017 No.05
In this study, we explore a condition where corporate debt can be strategically used in the stock market by governing its interpretations from investors. To disentangle the performance implications of corporate debt, we pay attention to the signaling aspect of debt financing. Acknowledging that investors can interpret the value of a firm with the level of debt, we postulate that debt can convey differentiated signals (i.e. driver vs. distress). In addition, we argue that the bifurcated role of debt can be moderated by marketing activities, which can affect the stakeholders’ interpretations. This idea is empirically examined in a population of SMEs (Small- and Medium-sized Enterprises). Using COMPUSTAT database of 2,174 U.S. public firms ranging from 1982 to 2010, we find resource-independent debt (called idiosyncratic debt) has bifurcated impacts on Buy-and-Hold Abnormal Returns (BHARs) and the marketing moderation of such relationship is also bifurcated.
Numerical Analysis of Turbulent Gas-Particle Flow and Coal Combustion in a Fluidized-Bed Calciner
Oh, Sea Cheon,Kim, Dong Wook,Yoon, Joon Yong,Byun, Sung Joon,Kwon, Woo-Teck,Kim, Soo-Ryong,Kim, Hee Taik 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.2
In this paper, we analyze numerically the characteristics of turbulent gas-particle flow, heat transfer, and coal combustion process in a fluidized-bed calciner for a cement manufacturing process. The simulation model was based on FLUENT, a commercially avaliable fluid dynamics code. The effects of the mutual interactions between particles were simulated by a discrete phase modeling approach, while the decomposition of calcium carbonate into calcium oxide and carbon dioxide upon heating was handled by a finite-rate reaction modeling approach. To verify the validity of the numerical simulation approach used in this work, the simulation results were compared with field data, for example, the gas velocity and temperature in some sampling points. The simulation results showed comparatively good correlations with the field data.