Chul Hwan Kim

Gyeongsang National University, Shinshū, Gyeongsangnam-do, South Korea

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Publications (87)145.2 Total impact

  • Source
    Yoo Jin Lee · Youngjin Kang · Jiyoon Jung · Seojin Kim · Chul Hwan Kim

    Preview · Article · Jan 2016
  • Ji Young Lee · Eun Hea Kim · Chul Hwan Kim · Jong Hye Park

    No preview · Article · Dec 2015 · Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry
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    ABSTRACT: In a previous study the authors determined that non-woody materials including brewers' grain (BG) and oil palm frond (OPF) could be alternatives to wood powder as organic fillers. However, they have the disadvantage of deteriorating the strength of paperboard. If the strength of paperboard could be improved, then one would expect more production cost reductions and bulk improvements by increasing the addition of organic fillers. In this study, surface modification of organic fillers was used as a method to improve paperboard strength. The goal was to find the most effective condition for surface modifications. Surface modifications of BG and OPF fillers were carried out using cationic and oxidized starches, and the strengths and reductions in the drying energies of the sheets were measured. The zeta potentials of the modified organic fillers showed that the surface modifications were performed properly. Surface modification with starches improved the bulk and strength of the sheets simultaneously, and modification with the addition of a large amount of cationic starch was more effective in improving the strengths and the reductions in drying energies of the sheets than using cationic and oxidized starches together.
    Preview · Article · Nov 2015 · Bioresources
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    ABSTRACT: Wood powder is widely used in paperboard mills to increase bulk and reduce drying-energy consumption, but this material also deteriorates paper strength because it interferes with the bonds between fibers. Although there have been many studies done to improve the strength of paperboard containing wood powder, specific applications have not recently been observed in paperboard mills. In this study, we carried out a new approach for improving paperboard strength by developing a new organic filler with the ability to increase the bonds between fibers. The residue of tapioca starch was used as raw material to manufacture an organic filler. The functionalities, including bulk and strength, were evaluated by making handsheets containing either wood powder or tapioca organic filler, or a mixture of the two, and measuring their physical properties. The organic filler showed lower bulk improvement and higher paperboard strength than the wood powder. The mixture of tapioca organic filler and wood powder showed improved paperboard strength compared to wood powder alone. Therefore, tapioca residue can be used as a raw material to manufacture an organic filler for paperboard mills.
    No preview · Article · Oct 2015 · Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry
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    ABSTRACT: Electron beam irradiation is also an eco-friendly treatment compared to other physical and chemical treatments. In this study, we attempted to evaluate the possibilities of energy savings by applying electron beam irradiation to the refining process. After softwood unbleached kraft pulp (UKP) was irradiated with electron beams at 50 and 100 kGy, it was beaten in a laboratory beater, and then its freeness and fiber properties were analyzed. The physical properties of their fiber handsheet were also and measured. As the irradiation dose of the electron beam and the beating time increased, lower freeness and fiber lengths of the UKP were observed. Handsheets made from UKP that was irradiated by electron beam and beaten showed a reciprocal relationship with the irradiation dose of the electron beam, in particular, the strength of the handsheets decreased dramatically at 100 kGy of irradiation. Therefore, it was confirmed that electron beam irradiation is effective in reducing the beating time or beating energy. But the irradiation dose must be controlled under 50 kGy to minimize the loss of paper strength.
    No preview · Article · Oct 2015 · Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry
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    ABSTRACT: As the production of palm oil has been increased, the generation of oil palm biomass is also increased and the utilization of the oil palm biomass become more significant topic. One third of the oil palm biomass is empty fruit bunch (EFB) and the other two thirds are oil palm trunks and fronds. However, the effective use of oil palm biomass has not been developed and most of it is discarded near oil palm plants. In this study, we investigated the applicability of EFB to the paperboard mills, as an organic filler. The new organic filler was manufactured in a laboratory by grinding and fractionating dried EFB powder, and its properties were analyzed. The particles of EFB organic filler were larger and more spherical than those of the commercial wood powder. The use of EFB organic filler resulted in a higher bulk of the handsheets with similar trends of physical strength, compared to those made with wood powder. It was concluded that EFB could be used as a raw material to manufacture organic filler for paperboard production.
    No preview · Article · Oct 2015 · Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry
  • Source
    Jong Hye Park · Ji Young Lee · Chul Hwan Kim · Eun Hea Kim

    Preview · Article · Oct 2015 · Bioresources

  • No preview · Article · Aug 2015 · Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry
  • Jaehyuk Cho · Jae Seon Eo · Kwang Ho In · Chul Hwan Kim · Jae Gol Choe
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    ABSTRACT: Bronchial mucous gland adenoma is a very rare benign tumor that arises from the bronchial mucous-secreting glands. Its detection and appearance using F-FDG PET/CT has not been well characterized. We present a case of a 59-year-old man with FDG-avid mucous gland adenoma that mimicked lung cancer on F-FDG PET/CT.
    No preview · Article · Aug 2015 · Clinical nuclear medicine
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    ABSTRACT: Fluorescent whitening agents (FWAs) are widely applied in the papermaking process to improve the CIE whiteness and the ISO brightness of papers. Large amounts of FWAs are used in the paper and paperboard industry, but no standard method exists for quantitative FWA analysis. Therefore, a new method is needed to analyze the presence of FWAs in paper and paperboard to control their additions and applications. In particular, FWA analysis must concentrate on those used for surface treatment of paper because their use in surface applications has increased recently. The purposes of this study were to measure the optical properties of papers surface-treated with oxidized starch containing FWAs and to deduce the regression equations for the quantitative analysis of FWAs used for surface treatments. Surface sizing was carried out to treat the surface of a base paper with T-FWA and H-FWA, and the pickup weight of the surface sized paper was measured to determine the real weight of FWAs transferred onto the paper surface. After surface sizing and preconditioning, the paper was evaluated for CIE whiteness, ISO brightness, fluorescence index, and reflectance at 440 nm using an Elrepho spectrophotometer. The CIE whiteness and the ISO brightness increased linearly as FWA content increased. The fluorescence index and the reflectance showed linear relationships with T-FWA and H-FWA. Linear regression equations were determined for the quantitative analysis of FWAs used for surface treatments.
    No preview · Article · Jun 2015 · Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry
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    Yun Hee Cho · Kyung-Sik Ahn · Chang Ho Kang · Chul Hwan Kim
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    ABSTRACT: Calcifying aponeurotic fibroma (CAF) is a rare, benign fibroblastic tumor that typically occurs in the palms of the hands and soles of the feet, in children and adolescents. Due to its infiltrative nature, this tumor can mimic malignancy on preoperative magnetic resonance imaging (MRI) and has a predilection for local recurrence. There are very few reports in the literature that describe features of CAF on MRI, especially those arising in the foot. We present an unusual case of a CAF affecting the dorsum of the foot in a four-year-old boy.
    Full-text · Article · Apr 2015 · Iranian Journal of Radiology
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    ABSTRACT: White ledger usually includes white office paper, computer paper, and copy machine paper. Because these grades need high optical properties, fluorescent whitening agents (FWAs) are widely used in the papermaking process. FWAs are the most powerful and effective chemical used to obtain high CIE whiteness and ISO brightness in papers. The rising demand for white or ultra-white papers has increased the use of FWAs. However, FWAs used in white ledger can restrict its use, even though white ledger is widely used as a raw material in paperboard mills. Therefore, it is necessary to develop methods to control FWAs from white ledger to increase its use in paperboard mills. In this study, the behaviors of disulpho fluorescent whitening agent (D-FWA), tetrasulpo fluorescent whitening agent (T-FWA), and hexasulpho fluorescent whitening agent (H-FWA) during the recycling process were identified as a first step to remove FWAs from white ledger. We prepared four types of papers (dyed with D-FWA, T-FWA, and H-FWA), disintegrated these papers, and made handsheets. This recycling process was carried out three times in a laboratory. After each round of recycling, the handsheets' CIE whiteness and fluorescence index were measured, and the distribution of FWAs in the Z-direction was observed using CLSM images. FWA reductions in the model papers were calculated using fluorescence indices as a function of the number of recycling. FWAs in handsheets containing T-FWA and H-FWA decreased linearly as a function of the number of recycling, but D-FWA did not show a significant reduction in the fluorescence index after recycling. T-FWA and H-FWA showed similar distributions of D-FWA after recycling. Therefore, as much T-FWA and H-FWA as possible must be detached in the early processes of papermaking at paperboard mills.
    No preview · Article · Feb 2015 · Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry
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    ABSTRACT: One of the most serious complications of breast reconstruction and augmentation using silicone implants is capsular contracture. Several preventive treatments, including vitamin E, steroids, antibiotics, and cysteinyl leukotriene inhibitors, have been studied, and their clinical effects have been reported. However, the problem of capsular contracture has not yet been completely resolved. This study was performed to compare anti-adhesion barrier solution (AABS) and fibrin in their ability to prevent fibrotic capsule formation and simultaneously evaluated their effect when used in combination by capsular thickness analysis and quantitative analysis of matrix metalloproteinases (MMPs), tissue inhibitors of metalloproteinases (TIMPs), and type I collagen within the fibrous capsule. This study used female six-week-old Sprague-Dawley rats. Eighty rats were equally subdivided into the four following groups: AABS-treated, fibrin-treated, AABS and fibrin combined-treated, and untreated control groups. Each rat received two silicone chips under the panniculus carnosus muscle layer. The test materials were applied around the silicon chips. Four weeks later, the implantation sites including the skin and muscle were excised to avoid the risk of losing the fibrous capsule around the implants. The capsular thickness was analyzed by Masson's trichrome stain. Quantitative analysis of type I collagen, MMPs, and TIMPs was performed by real-time PCR, Western blot, and zymography. The mean capsular thickness was 668.10 ± 275.12 μm in the control group, 356.97 ± 112.11 μm in the AABS-treated group, 525.96 ± 130.97 μm in the fibrin-treated group, and 389.24 ± 130.51 μm in the AABS and fibrin combined-treated group. Capsular thickness was significantly decreased in all experimental groups (p < 0.05). Capsular thickness was greater in the fibrin-treated group than in the AABS-treated group (p < 0.05). There was no statistically significant difference in capsular thickness between the AABS and fibrin combined-treated group and the AABS- or fibrin-treated group (p > 0.05). Compared to the control group, the experimental groups had significantly lower expressions of type I collagen and MMP-1 (p < 0.05), but there was no statistically significant difference in expressions of type I collagen and MMP-1 between the AABS-, fibrin-, and AABS and fibrin combined-treated groups (p > 0.05). The expressions of MMP-2 and TIMP-2 were not significantly different between the control and the experimental groups (p > 0.05). AABS is more effective in reducing capsular thickness compared with fibrin treatment in a white rat model. This journal requires that authors assign a level of evidence to each submission to which Evidence-Based Medicine rankings are applicable. This excludes Review Articles, Book Reviews, and manuscripts that concern Basic Science, Animal Studies, Cadaver Studies, and Experimental Studies. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors http://www.springer.com/00266 .
    No preview · Article · Dec 2014 · Aesthetic Plastic Surgery
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    ABSTRACT: Reactive oxygen species modulator 1 (Romo1) is a novel protein that plays an important role in intracellular reactive oxygen species generation. Romo1 is overexpressed in most cancer cell lines and related to invasiveness and chemoresistance in vitro. However, little information is available on its clinical implications. We investigated the association between Romo1 expression and the clinical outcomes of non-small cell lung cancer (NSCLC) patients who underwent surgical resection. Romo1 protein expressions were evaluated immunohistochemically in resected tumor specimens. Survival analyses for overall population (n=110) and early-stage patients (n=97) were performed according to clinical parameters including level of Romo1 expression. Multivariate analyses showed that high Romo1 expression in tumor tissues was significantly associated with short disease-free survival (hazard ratio [HR]=3.16, 95% confidence interval [CI]: 1.21-8.22), and with short overall survival (HR=3.22, 95% CI: 1.02-10.21). Stronger associations were observed between Romo1 expression and disease-free survival (HR=3.69, 95% CI: 1.39-9.97) and overall survival (HR=4.21, 95% CI: 1.12-14.67) in stage I and II patients than in the overall population. Romo1 expression was not associated with any clinical parameter including age, gender, smoking status, stage, differentiation, or tumor histology. Increased Romo1 expression in surgically resected NSCLC was found to be significantly associated with early recurrence and poor survival. Romo1 overexpression could be a potential adverse prognostic marker in this setting. Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.
    Full-text · Article · Nov 2014 · Lung cancer (Amsterdam, Netherlands)
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    ABSTRACT: In this study, we investigated the applicability of wood powder to the manufacture of paperboard. Laboratory studies and mill trials were carried out to develop wood powder suitable for a functional additive of paperboard and to determine its ability to improve the sheet bulk and to reduce the drying steam. The wood powder was manufactured by grinding and screening. The maximum particle size was a critical factor affecting the applicability of the wood powder as an additive. In the laboratory studies, handsheets containing the wood powder were made, and their physical strength properties were analyzed. The wood powder increased the sheet bulk and decreased the physical strength of the sheets. The mill trials were performed in a white lined chipboard (duplex board) mill, and the wood powder was added to the middle ply of Sunny Coated (SC) 300 g/m2 and 400 g/m2, a commercial grade of duplex board that contains a back ply made of deinked pulp. As the level of the wood powder was increased, the bulk increased linearly, and the drying steam decreased significantly. We conclude that well-manufactured wood powder can be used as an additive for paperboard and is beneficial with respect to bulk improvement and drying steam reduction.
    No preview · Article · Nov 2014 · Tappi Journal
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    ABSTRACT: The polysulfide shuttle has been an impediment to the development of lithium–sulfur batteries with high capacity and cycling stability. Here, we report a new strategy to remedy the problem that uses alpha-lipoic acid (ALA) as an electrolyte additive to form a polysulfide rejection layer on the cathode surface via the electrochemical and chemical polymerization of ALA and a stable solid electrolyte interface (SEI) layer on the Li metal anode during the first discharge. The poly(ALA) layer formed in situ effectively prevents the polysulfide shuttle and consequently enhances the discharge capacity and cycling stability, owing to the Donnan potential developed between the polysulfide-concentrated cathode and the fixed negative charge-concentrated poly(ALA) layer. Also, the SEI layer additionally prevents the chemical reaction of the polysulfide and Li metal anode. The approach, based on the double effect, encompasses a new scientific strategy and provides a practical methodology for high performance lithium–sulfur batteries.
    Full-text · Article · Oct 2014 · Journal of Materials Chemistry A
  • In Kyung Yoo · Hoon Jai Chun · Chul Hwan Kim

    No preview · Article · Sep 2014 · Gastroenterology
  • Soon Young Jang · Aeree Kim · Jin Kyoung Kim · Chungyel Kim · Youl-Hee Cho · Jong-Ho Kim · Chul Hwan Kim · Ji-Yun Lee
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    ABSTRACT: Metformin is the most widely used anti-diabetic drug in the world. Recent evidence indicates that metformin could potentially inhibit tumorigenesis. In the present study, we found that metformin inhibited cell migration and invasion of phorbol 12-myristate 13-acetate-induced MCF-7 and tamoxifen-resistant MCF-7 breast cancer cells. This inhibition was correlated with the modulation of matrix metalloproteinase-9 (MMP9) via the suppression of its expression and proteolytic activity. These results indicate that metformin leads to the suppression of migration and invasion through regulation of MMP9 and it may have potential as an anticancer drug for therapy in human breast cancer, especially of chemoresistant cancer cells.
    No preview · Article · Aug 2014 · Anticancer research
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    ABSTRACT: An increased understanding of the genetic pathways involved in renal cell carcinoma has resulted in the development of various drugs that target relevant signaling cascades for the specific treatment of this disease. However, no validated predictive markers have been identified to guide the decision whether patients should receive vascular endothelial growth factor-targeted therapy or mammalian target of rapamycin-targeted therapy. We present what is, to the best of our knowledge, the first case of renal cell carcinoma in a patient with tuberous sclerosis complex who was successfully treated with everolimus. The patient was a 49-year-old Korean woman with tuberous sclerosis complex and recurrent renal cell carcinoma. The patient was treated with the tyrosine kinase inhibitor sunitinib followed by the mammalian target of rapamycin inhibitor everolimus. This treatment resulted in a prolonged response and significant clinical benefit. Notably, everolimus ameliorated the symptoms related not only to renal cell carcinoma but also to tuberous sclerosis complex. This case provides a rationale for the use of everolimus as first-line treatment for this specific patient population in order to target the correct pathway involved in carcinogenesis.
    Full-text · Article · Mar 2014 · Journal of Medical Case Reports
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    ABSTRACT: Vascular endothelial growth factor (VEGF) seems to be involved in the pathogenesis of chronic obstructive pulmonary disease (COPD), but its site-specific expression in lung tissue and the relationship with hypoxia inducible factor-1 alpha (HIF-1α) expression in chronic bronchitis (CB) type COPD have not been studied. We evaluated the expression of VEGF and its receptors in various compartments of lung tissue in three groups: non-smokers with normal lung function (non-smokers, n=10), smokers without COPD (healthy smokers, n=10) and smokers with CB (CB, n=10), using immunohistochemical staining and Western blotting. The expression of HIF-1α was assessed by enzyme-linked immunosorbent assay. Compared with healthy smokers, VEGF expression in CB was significantly increased in bronchiolar epithelium, vascular endothelium and vascular smooth muscle (p<0.05). VEGF receptor (VEGFR)-2 expression in CB was also increased in bronchiolar smooth muscle, vascular endothelium and vascular smooth muscle compared with healthy smokers (p<0.05). The level of HIF-1α was increased in CB compared with healthy smokers and positively correlated with those of VEGF (r=0.64, p<0.05). VEGF and VEGFR-2 expression was up-regulated in CB and increased expression of VEGF was related with HIF-1α. HIF-1α-regulated VEGF overexpression may be a characteristic of chronic bronchitis.
    Full-text · Article · Jan 2014 · Clinical biochemistry

Publication Stats

811 Citations
145.20 Total Impact Points

Institutions

  • 2014-2015
    • Gyeongsang National University
      Shinshū, Gyeongsangnam-do, South Korea
    • Orange Power
      Daiden, Daejeon, South Korea
  • 2002-2015
    • Korea University
      • Department of Pathology
      Sŏul, Seoul, South Korea
    • Mayo Clinic - Rochester
      Рочестер, Minnesota, United States
  • 2001-2011
    • Sungkyunkwan University
      • • Department of Electronic, Electrical and Computer Engineering
      • • School of Pharmacy
      Sŏul, Seoul, South Korea
  • 2010
    • University of Seoul
      Sŏul, Seoul, South Korea
  • 2008
    • Cornell University
      Итак, New York, United States
  • 2006
    • Seoul Medical Center
      Sŏul, Seoul, South Korea
  • 2004
    • University of Bath
      • Department of Electronic and Electrical Engineering
      Bath, ENG, United Kingdom
    • Korea University Medical Center
      Sŏul, Seoul, South Korea
  • 2001-2004
    • Chonbuk National University
      Tsiuentcheou, North Jeolla, South Korea