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Jeon, Hwang Gyun,Gong, In Hyuck,Hwang, Jin Ho,Choi, Don Kyung,Lee, Seung Ryeol,Park, Dong Soo Blackwell Publishing Ltd 2012 BJU international Vol.109 No.10
<P>Study Type – Prognosis (case series)</P><P>Level of Evidence 4</P><P><B>What's known on the subject? and What does the study add?</B></P><P>At present, many studies have been executed to identify predictors for chronic kidney disease or renal insufficiency after radical nephrectomy or partial nephrectomy. We examined whether preoperative kidney volume is a predictor for renal function after radical or partial nephrectomies in RCC patients. To our knowledge, this is the first study to report on the relationship between preoperative kidney volume and changes in renal function in RCC patients who underwent radical nephrectomy or partial nephrectomy performed by one surgeon.</P><P><B>OBJECTIVE</B></P><P><P>To investigate whether preoperative kidney volume is a prognostic factor for predicting the postoperative glomerular filtration rate (GFR) in renal cell carcinoma (RCC) patients.</P></P><P><B>PATIENTS AND METHODS</B></P><P><P>We included 133 patients who underwent radical (<I>n</I>= 83) or partial (<I>n</I>= 50) nephrectomy for RCC.</P><P>Kidney parenchymal volume was measured using personal computer‐based software and GFR was estimated before and after surgery at 6 and 12 months.</P><P>We evaluated the change in kidney volume after radical and partial nephrectomy and used regression analysis to identify predictors of lower post‐surgical GFR at 12 months.</P></P><P><B>RESULTS</B></P><P><P>The mean volume of the normal side kidney for the radical nephrectomy group increased from 142.4 mL to 166.0 mL (17.2%) and 171.5 mL (21.2%) after surgery at 6 and 12 months, respectively.</P><P>In the partial nephrectomy group, the volume of the normal side kidney increased from 127.2 mL to 138.8 mL (9.1%) and 140.6 mL (10.9%) after surgery at 6 and 12 months, respectively.</P><P>The volume of the operated side kidney decreased from 128.5 mL to 102.3 mL (20.1%) and 101.8 (20.6%) after surgery at 6 and 12 months, respectively.</P><P>In the radical nephrectomy group, older age (<I>P</I> < 0.001), preoperative volume of the normal kidney (<I>P</I>= 0.022) and preoperative GFR for the normal side kidney (<I>P</I>= 0.045) were significant predictors of lower post‐surgical GFR at 12 months.</P><P>In the partial nephrectomy group, older age (<I>P</I>= 0.001) and preoperative volume for both kidneys (<I>P</I>= 0.037) were significant predictors of lower post‐surgical GFR at 12 months.</P></P><P><B>CONCLUSION</B></P><P><P>Preoperative kidney volume is an independent predictor of GFR in RCC patients who underwent radical or partial nephrectomy.</P></P>
Jeon, Hee-Jae,Ju, Kang-Sig,Joo, Jai-Hwang,Kim, Hyun-Gyun The Korean Institute of Electrical and Electronic 2012 Transactions on Electrical and Electronic Material Vol.13 No.1
LED lighting systems that combine lighting capability, emotional and physiological characteristics are required for lighting source and multifunctional applications. In this work, Simulation studies using optical analysis software packages, Light Tools, are presented. This is done to estimate the uniformity ratio of illuminance and photosynthetic photon flux density (PPFD) of the periodic 2D lattice arrangements, such as square, diamond, two-way bias quadrangular, hexagonal, and Kagome lattices, under the same transmissivity, absorptance and reflectivity. It has been found out that the two-dimensional Kagome lattice arrangement exhibited high uniformity ratio of illuminance and PPFD compared to other lattices. Accordingly, these results can be used to guide a design and improve the lighting environment which in turn would maximize the uniform distributions of illuminance.
Jeon, Cheolho,Hwang, Han-Na,Lee, Wang-Geun,Jung, Yong Gyun,Kim, Kwang S,Park, Chong-Yun,Hwang, Chan-Cuk RSC Pub 2013 Nanoscale Vol.5 No.17
<P>Copper is considered to be the most promising substrate for the growth of high-quality and large area graphene by chemical vapor deposition (CVD), in particular, on the (111) facet. Because the interactions between graphene and Cu substrates influence the orientation, quality, and properties of the synthesized graphene, we studied the interactions using angle-resolved photoemission spectroscopy. The evolution of both the Shockley surface state of the Cu(111) and the π band of the graphene was measured from the initial stage of CVD growth to the formation of a monolayer. Graphene growth was initiated along the Cu(111) lattice, where the Dirac band crossed the Fermi energy (EF) at the K point without hybridization with the d-band of Cu. Then two rotated domains were additionally grown as the area covered with graphene became wider. The Dirac energy was about -0.4 eV and the energy of the Shockley surface state of Cu(111) shifted toward the EF by ~0.15 eV upon graphene formation. These results indicate weak interactions between graphene and Cu, and that the electron transfer is limited to that between the Shockley surface state of Cu(111) and the π band of graphene. This weak interaction and slight lattice mismatch between graphene and Cu resulted in the growth of rotated graphene domains (9.6 and 8.4), which showed no significant differences in the Dirac band with respect to different orientations. These rotated graphene domains resulted in grain boundaries which would hinder a large-sized single monolayer growth on Cu substrates.</P>
Alterations of Gene Expression by Beta-tricalcium Phosphate in Osteoblast-like MG63 Cells
Jeon, Jae-Yun,Im, Tae-Yun,Jeon, Seung-Hwan,Hwang, Kyung-Gyun,Park, Chang-Joo Korean Association of Maxillofacial Plastic and Re 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.4
Purpose: Beta-tricalcium phosphate (${\beta}$-TCP) is a synthetic calcium phosphate ceramic that has widely been used as a bone material to repair bone defects. Despite many clinical studies, the molecular mechanism whereby this biomaterial alters the gene expression in osteoblasts to promote bone formation is poorly understood. Thus, we attempted to address this question by using microarray techniques to identify the genes that are differentially regulated in osteoblasts exposed to ${\beta}$-TCP. Methods: By using DNA microarrays, we identified several genes whose expression levels were significantly up- or down-regulated in osteoblast-likeMG-63cells cultured with ${\beta}$-TCP at a concentration of 100 mg/10 ml for 24 hours. Results: The differentially expressed genes covered a broad range of functional activities: signal transduction, transcription, cell cycle regulation, vesicular transport, apoptosis, immunity, cytoskeletal elements and cell proliferation and differentiation. Conclusion: The gene expression changes related to cell proliferation and differentiation, vesicle transport, immunity and defense could affect the osteogenic activities of osteoblasts for bone regeneration. However, further studies will be required to verify the relative importance of these genes in bone formation, their temporal and spatial expression patterns and their interactions with each other.
JEON, SE HUI,KIM, NAM HEE,SHIM, MOON BO,JEON, YOUNG WOOK,AHN, JI HYE,LEE, SOON HO,HWANG, IN GYUN,RHEE, MIN SUK ational Association for Food Protection 2015 Journal of food protection Vol.78 No.4
<P>The present study examined 469 commercially available fermented alcoholic beverages (FABs), including beer (draft, microbrewed, and pasteurized), fruit wine (grape and others), refined rice wine, and yakju (raw and pasteurized). Samples were screened for Escherichia coli and eight foodborne pathogens (Bacillus cereus, Campylobacter jejuni, Clostridium perfringens, Escherichia coli O157:H7, Listeria monocytogenes, Salmonella spp., Staphylococcus aureus, and Yersinia enterocolitica), and the aerobic plate count, lactic acid bacteria, acetic acid bacteria, fungi, and total coliforms were also enumerated. Microbrewed beer contained the highest number of microorganisms (average aerobic plate count, 3.5; lactic acid bacteria, 2.1; acetic acid bacteria, 2.0; and fungi, 3.6 log CFU/ml), followed by draft beer and yakju (P < 0.05), whereas the other FABs contained <25 CFU/25 ml microorganisms. Unexpectedly, neither microbial diversity nor microbial count correlated with the alcohol content (4.7 to 14.1%) or pH (3.4 to 4.2) of the product. Despite the harsh conditions, coliforms (detected in 23.8% of microbrewed beer samples) and B. cereus (detected in all FABs) were present in some products. B. cereus was detected most frequently in microbrewed beer (54.8% of samples) and nonpasteurized yakju (50.0%), followed by pasteurized yakju (28.8%), refined rice wine (25.0%), other fruit wines (12.3%), grape wine (8.6%), draft beer (5.6%), and pasteurized beer (2.2%) (P < 0.05). The finding that spore-forming B. cereus and coliform bacteria can survive the harsh conditions present in alcoholic beverages should be taken into account (alongside traditional quality indicators such as the presence of lactic acid-producing bacteria, acetic acid-producing bacteria, or both) when developing manufacturing systems and methods to prolong the shelf life of high-quality FAB products. New strategic quality management plans for various FABs are needed.</P>
황민영(Hwang min young),이종우(Lee jong woo),김용균(Kim yong gyun),전상훈(Jeon Sang hun),장윤한(Chang youn-han),전충환(Jeon chung hwan) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Secondary batteries are uesd cell phone and notebook computer. Cathode active material for the secondary battery is processed in high temperature furnace. Optimizing design for furnace is important to get the best quality of the material. Numerical approach for analyzing the fluid flow in the furnace saves time and money in comparison with experimental method. In this study, a furnace modeled and the boundary conditions are set for CFD analysis. The characteristic of the fluid thermal flow is obtained.
Injun Jeon,Jin Hyun Hwang,Tae Gyun Kim,Linghong Yin,이형우,Jong Pil Kim,Hyung Soo Ahn,조채용 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.2
Peony flower-like γ-Ga2O3 nanosheets (γ-Ga2O3 NSs) were synthesized and carbon layers were coated on their surfaces usinga simple hydrothermal process with subsequent carbonization. The γ-Ga2O3 NSs comprised ultrathin layers, which are tensof nanometers in thickness. The carbon-coated γ-Ga2O3 NS (γ-Ga2O3@C NS) electrode exhibited a specific capacity of 598mAh g−1 at 200 cycles, at a current density of 0.5 A g−1, higher than that of γ-Ga2O3 NSs (60 mAh g−1). Furthermore, a specificcapacity of 100 mAh g−1 at 5 A g−1 was achieved owing to the low charge transfer resistance through the carbon layers. Thisstudy suggests that two-dimensional γ-Ga2O3@C NSs with both large specific area and high charge carrier transport arepromising active materials for lithium-ion battery anodes with better electrochemical performance.