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Jo, Kwanghyun,Ahn, Sung Hwan,Chung, Kwangzoo,Cho, Sungkoo,Shin, Eun Hyuk,Park, Seyjoon,Hong, Chae-Seon,Kim, Dae-Hyun,Lee, Boram,Lee, Woojin,Choi, Doo Ho,Lim, Do Hoon,Pyo, Hong Ryull,Han, Youngyih Korean Society of Medical Physics 2019 의학물리 Vol.30 No.1
Purpose: To report the initial experience of patient-specific quality assurance (pQA) for the wobbling and line-scanning proton therapy at Samsung Medical Center. Materials and Methods: The pQA results of 89 wobbling treatments with 227 fields and 44 line-scanning treatments with 118 fields were analyzed from December 2015 to June 2016. For the wobbling method, proton range and spread-out Bragg peak (SOBP) width were verified. For the line-scanning method, output and two-dimensional dose distribution at multiple depths were verified by gamma analysis with 3%/3 mm criterion. Results: The average range difference was -0.44 mm with a standard deviation (SD) of 1.64 mm and 0.1 mm with an SD of 0.53 mm for the small and middle wobbling radii, respectively. For the line-scanning method, the output difference was within ${\pm}3%$. The gamma passing rates were over 95% with 3%/3 mm criterion for all depths. Conclusions: For the wobbling method, proton range and SOBP width were within the tolerance levels. For the line-scanning method, the output and two-dimensional dose distribution showed excellent agreement with the treatment plans.
Jo, Kwanghyun,Ahn, Sung Hwan,Chung, Kwangzoo,Cho, Sungkoo,Shin, Eunhyuk,Hong, Chae-Seon,Park, Seyjoon,Kim, Dae-Hyun,Lee, Boram,Lee, Woo-Jin,Seo, Se-Kwang,Jang, Jun-Young,Choi, Doo Ho,Lim, Do Hoon,Han, Korean Society of Medical Physics 2016 의학물리 Vol.27 No.4
We have treated various disease sites using wobbling and scanning proton therapy techniques since December 2015 at the Samsung Medical Center. In this study, we analyze the treatment time for each disease site in 65 wobbling and 50 scanning patient treatments. Treatment times are longest for liver and lung patients using the respiratory gating technique in the wobbling treatment and for cranio-spinal irradiation in pediatric patients with anesthesia in the scanning treatment. Moreover, we analyze the number of incidents causing treatment delays and the corresponding treatment delay time. The X-ray panel was the main reason for delays in the wobbling treatment; this decreased continually from January to June 2016, related closely to the proficiency of the human operators involved. The main reason for delays in the scanning treatment was interlocks during scanning pattern delivery; this was resolved by proton machine engineers. Through this work, we hope to provide other institutes with useful insight for initial operation of their proton therapy machines.
Vector susceptibility and QCD phase transition in AdS/QCD models
Jo, KwangHyun,Kim, Youngman,Lee, Hyun Kyu,Sin, Sang-Jin IOP Publishing Ltd 2008 Journal of high energy physics Vol.2008 No.11
We calculate the vector isospin susceptibility in AdS/QCD models to study QCD phase transition. In the hard wall model, we show explicitly that the infalling boundary condition at the horizon can be treated as a Dirichlet boundary with a fine-tuned boundary value in the zero frequency and momentum limit. With the infalling boundary condition, we uniquely determine the overall normalization of the vector isospin susceptibility in the hard wall model. In the framework of the soft wall model, we obtain the vector isospin susceptibilitywith and without Hawking-Page transition and compare our results with lattice QCD. We briefly discuss the chiral symmetry restoration in the AdS/QCD models.
Jo, Yeadam,Kim, Jaai,Hwang, Kwanghyun,Lee, Changsoo Elsevier 2018 Waste management Vol.78 No.-
<P><B>Abstract</B></P> <P>This study compared single- versus two-phase systems for semi-continuous anaerobic digestion of food waste without pH control at varying organic loading rates (OLRs). The methanogenic reactors of both systems required trace element supplementation for stable operation at 3.0 g VS (volatile solids)/L∙d or higher OLRs. Under trace-element supplemented conditions, both systems achieved stable and efficient performance at OLRs up to 4.0 g VS/L∙d. The two-phase system outperformed the single-phase system at 1.0–4.0 g VS/L∙d OLRs, but it failed at an OLR of 5.0 g VS/L∙d. Meanwhile, the single-phase system maintained the stable performance and reached its maximum methane production at this OLR. These results suggest that a single-phase configuration is more advantageous for robust treatment of food waste without pH control at high organic and hydraulic loads. Hydrogenotrophic methanogens dominated the methanogen community throughout the experiment in both systems. Microbial community structure shifts correlated with reactor operation and performance characteristics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single- and two-phase AD systems were compared for FW treatment without pH control. </LI> <LI> Both systems required trace element supplementation at OLRs above 2.0 g VS/L∙d. </LI> <LI> Two-phase system showed higher methanation performance at OLRs up to 4.0 g VS/L∙d. </LI> <LI> Single-phase system is advantageous for stable and robust operation at higher OLRs. </LI> <LI> Hydrogenotrophic methanogens dominated the methanogen community in both systems. </LI> </UL> </P>
Enhancing anaerobic digestion of vegetable waste and cellulose by bioaugmentation with rumen culture
Jo, Yeadam,Hwang, Kwanghyun,Lee, Changsoo Techno-Press 2019 Membrane water treatment Vol.10 No.3
Anaerobic digestion (AD) has been widely used to valorize food waste (FW) because of its ability to convert organic carbon into <TEX>$CH_4$</TEX> and <TEX>$CO_2$</TEX>. Korean FW has a high content of fruits and vegetables, and efficient hydrolysis of less biodegradable fibers is critical for its complete stabilization by AD. This study examined the digestates from different anaerobic digesters, namely Rs, Rr, and Rm, as the inocula for the AD of vegetable waste (VW) and cellulose (CL): Rs inoculated with anaerobic sludge from an AD plant, Rr inoculated with rumen fluid, and Rm inoculated with anaerobic sludge and augmented with rumen fluid. A total of six conditions (<TEX>$3\;inocula{\</TEX><TEX>times}2\;substrates$</TEX>) were tested in serial subcultures. Biogas yield was higher in the runs inoculated with Rm than in the other runs for both VW (up to 1.10 L/g VS added) and CL (up to 1.05 L/g VS added), and so was biogas production rate. The inocula had different microbial community structures, and both substrate type and inoculum source had a significant effect on the formation and development of microbial community structures in the subcultures. The overall results suggest that the bioaugmentation with rumen microbial consortium has good potential to enhance the anaerobic biodegradability of VW, and thereby can help more efficiently digest high fiber-content Korean FW.
Parry-Romberg Syndrome Augmented by Hyaluronic Acid Filler
( Mingyul Jo ),( Hyosang Ahn ),( Hyeyoung Ju ),( Eunjung Park ),( Jisook Yoo ),( Min-soo Kim ),( Mihn-sook Jue ),( Kwanghyun Choi ) 대한피부과학회 2018 Annals of Dermatology Vol.30 No.6
Parry Romberg Syndrome (PRS), also known as idiopathic progressive hemifacial atrophy, is a rare neurocutaneous disorder characterized by loss of skin and subcutaneous fat of face, muscles, and bones causing unilateral atrophy. Most patients require only soft tissue augmentation although syndrome has varying grades of severity. In the majority of reported cases, it has been treated with surgical flap or autologous fat transplantation. However, these treatments need complicated surgical skills which take a lot of time and cost. Herein we report the first case of PRS augmented by hyaluronic acid (HA) filler in a 42-year-old female patient to suggest that HA filler could be a safe, simple, and even rational economic alternative to surgical treatment. (Ann Dermatol 30(6) 704∼707, 2018)
( Mingyul Jo ),( Mi-ji Lee ),( Jung Min Bae ),( Min-soo Kim ),( Mihn-sook Jue ),( Kwanghyun Choi ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2
Background: UV light can be used to measure the margin and depth of pigmented lesions. But, there have been no studies to classify the histologic type of melasma using UV light dermoscopy which has both features of dermoscopy and Wood's lamp. Objectives: The goal of this study is to compare the diagnostic accuracy of UV light dermoscopy with that of dermoscopy and Wood's lamp in determining the histologic type of melasma. Methods: Thirty patients with melasma on the face were evaluated by two expert examiners independently, using dermoscopy (IDS-1100ILLUCO<sup>(R)</sup> 10x), Wood's light(Dermavision<sup>(R)</sup> UVA 360nm) and UV light dermoscopy(IDS-2100 ILLUCO<sup>(R)</sup> 10x). Later, the observed findings were compared with the histologic findings. Results: Compared with biopsy specimen, the diagnostic accuracy via Wood's light, dermoscopy and UV light dermoscopy in distinguishing histologic type of melasma were 23.3%, 40% and 80%, respectively. The increase in contrast at the 400nm region was interrelated with an increased amount of melanin in the basal layer(P=0.013). The increased contrast variation on UV light dermoscopy was correlated with increased dermal free melanin(P=0.001) and melanophage(P=0.004). In addition, globular pattern observed on UV light dermoscopy indicated the increased melanin pigment of stratum basalis(P=0.014). Conclusion: UV light dermoscopy can be considered an accurate diagnostic equipment in the estimating the depth and border of melasma.
Dendrimer-Capped Gold Nanoparticles for Highly Reliable and Robust Surface Enhanced Raman Scattering
Kim, Kwanghyun,Lee, Jeongyeop,Jo, Gyeongcheon,Shin, Seungmin,Kim, Jin-Baek,Jang, Ji-Hyun American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.31
<P>Dendrimer-stabilized gold nanoparticles (Au-Den) were prepared by a facile solution based method for a highly reliable and robust surface enhanced Raman scattering (SERS) substrate. Au-Den was selectively attached on the surface of reduced graphene oxide (rGO) by noncovalent interactions between the Au capping dendrimer and the graphene surface. Au-Den/rGO exhibits the outstandingly stable and highly magnified Raman signal with an enhancement factor (EF) of 3.9 X 10(7) that enables detection of R6G dyes with concentration as low as 10 nM, retaining 95% of the Raman signal intensity after 1 year. The remarkable stability and enhancement originated not only from a simple combination of the electromagnetic and chemical mechanism of SERS but also from intensified packing density of stable Au Den on the graphene substrate due to the firm binding between the dendrimer capped metal nanoparticles and the graphene substrate. This method is not limited to the gold nanoparticles and G4 dendrimer used herein, but also can be applied to other dendrimers and metal nanoparticles, which makes the material platform suggested here superior to other SERS substrates.</P>