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Jung, Hyunchul,Jo, Dong Hyun,Lee, Chang Hun,Chung, Wonkeun,Shin, Dongkun,Kim, Sung Hyun American Chemical Society 2014 ENERGY AND FUELS Vol.28 No.6
<P>Solid amine sorbents having adequate particle size with high CO<SUB>2</SUB> adsorption capacity were successfully prepared using poly(ethylenimine) (PEI) as the amine and mesoporous poly(methyl methacrylate) (PMMA) beads as the support. The PEI-impregnated PMMA-supported sorbent exhibited CO<SUB>2</SUB> adsorption capacity up to 4.26 mmol/g with PMMA-55 at 75 °C in pure CO<SUB>2</SUB> gas flow. The effect of the temperature on the adsorption capacity of PMMA-55 was investigated, and the maximum adsorption capacity was obtained at 50 °C with a CO<SUB>2</SUB> exposure time of 180 min, different from the tendency of most silica-supported sorbents. The effect of surfactant addition on the adsorption performance of PMMA-supported sorbents differed from those of silica-supported sorbents because of the different surface characteristics between PMMA and silica. Adsorption/desorption cycling was also performed to examine the suitability of the amine sorbent for potential application.</P>
Immune signatures correlate with L1 retrotransposition in gastrointestinal cancers
Jung, Hyunchul,Choi, Jung Kyoon,Lee, Eunjung Alice Cold Spring Harbor Laboratory Press 2018 Genome research Vol.28 No.8
<P>Long interspersed nuclear element-1 (LINE-1 or L1) retrotransposons are normally suppressed in somatic tissues mainly due to DNA methylation and antiviral defense. However, the mechanism to suppress L1s may be disrupted in cancers, thus allowing L1s to act as insertional mutagens and cause genomic rearrangement and instability. Whereas the frequency of somatic L1 insertions varies greatly among individual tumors, much remains to be learned about underlying genetic, cellular, or environmental factors. Here, we report multiple correlates of L1 activity in stomach, colorectal, and esophageal tumors through an integrative analysis of cancer whole-genome and matched RNA-sequencing profiles. Clinical indicators of tumor progression, such as tumor grade and patient age, showed positive association. A potential L1 expression suppressor, TP53, was mutated in tumors with frequent L1 insertions. We characterized the effects of somatic L1 insertions on mRNA splicing and expression, and demonstrated an increased risk of gene disruption in retrotransposition-prone cancers. In particular, we found that a cancer-specific L1 insertion in an exon of MOV10, a key L1 suppressor, caused exon skipping and decreased expression of the affected allele due to nonsense-mediated decay in a tumor with a high L1 insertion load. Importantly, tumors with high immune activity, for example, those associated with Epstein-Barr virus infection or micro-satellite instability, tended to carry a low number of L1 insertions in genomes with high expression levels of L1 suppressors such as APOBEC3s and SAMHD1. Our results indicate that cancer immunity may contribute to genome stability by suppressing L1 retrotransposition in gastrointestinal cancers.</P>
Jung, Hyunchul,Chung, Wonkeun,Lee, Chang Hun,Kim, Sung Hyun American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7
<P>White light-emitting diodes (LEDs) were fabricated using GaN-based 380-nm UV LEDs precoated with the composite of blue-emitting polymer (poly[(9,9-dihexylfluorenyl-2,7-diyl)-alt-co-(2-methoxy-5-{2-ethylhexyloxy)-1 ,4-phenylene)]), yellow green-emitting polymer (poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1',3}-thiadiazole)]), and 605-nm red-emitting quantum dots (QDs). CdSe cores were obtained by solvothermal route using CdO, Se precursors and ZnS shells were synthesized by using diethylzinc, and hexamethyldisilathiane precursors. The optical properties of CdSe/ZnS QDs were characterized by UV-visible and photoluminescence (PL) spectra. The structural data and composition of the QDs were transmission electron microscopy (TEM), and EDX technique. The quantum yield and size of the QDs were 58.7% and about 6.7 nm, respectively. Three-band white light was generated by hybridizing blue (430 nm), green (535 nm), and red (605 nm) emission. The color-rendering index (CRI) of the device was extremely improved by introducing the QDs. The CIE-1931 chromaticity coordinate, color temperature, and CRI of a white LED at 20 mA were (0.379, 0.368), 3969 K, and 90, respectively.</P>
Jung, Hyunchul,Chung, Wonkeun,Lee, Chang Hun,Kim, Sung Hyun The Optical Society 2013 Applied optics Vol.52 No.10
<P>Red-emitting ZnCuInS2 semiconductor nanocrystals (NCs) were synthesized and surface modification was performed on the NCs with oleylamine, trioctylphosphine, and 3-mercaptopropionic acid by the ligand exchange strategy. UV-visible spectroscopy, photoluminescence (PL) spectroscopy, time-resolved PL analysis, and attenuated total reflection Fourier transform infrared spectroscopy were used to verify the surface modification of NCs. Additionally, white light-emitting diodes (LEDs) were fabricated using surface modified red-emitting ZnCuInS2 NCs as red phosphor to compensate for the deficiency of red emission in white LEDs, consisting of blue LEDs as excitation sources and YAG:Ce as yellow phosphor.</P>
( Hyunchul Jung ),( Seung-yeob Yang ),( Keun-tae Cho ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2024 Brain Tumor Research and Treatment Vol.12 No.1
Background For patients diagnosed with asymptomatic, non-functional pituitary incidentaloma (PI), periodic follow-up is generally proposed. However, the recommended follow-up period differs among existing guidelines and consensus is lacking. Thus, this study aimed to suggest follow-up periods for PI based on MRI characteristics. Methods Between 2007 and 2023, 245 patients who were diagnosed with PI were retrospectively assessed. Their mean clinical and neuroradiological follow-up periods were 74.2 and 27.3 months, respectively. Their baseline clinical and neuroradiological characteristics were analyzed. These 245 patients were divided into two groups: those with PI size progression and those without PI size progression. Additionally, neuroradiological features of each group were analyzed according to presumptive diagnoses of PI. Results PI size increased in 33 of 245 patients. For the remaining 212 patients, PI size decreased or stayed unchanged. Of the 33 patients with PI size progression, ten underwent surgery. Stalk deviation (p<0.001) and lesion enhancement (p=0.001) were significantly more observed in those with PI size progression than in those without PI size progression. MRI morphological factors were not related to changes in PI size in the presumptive Rathke’s cleft cyst group. In the presumptive pituitary adenoma group, absence of tumor enhancement (p<0.001) and stalk deviation (p<0.001) were significantly associated with tumor reduction and progression, respectively. Conclusion Our findings support an additional guideline for patients with asymptomatic non-functional PI without stalk deviation and enhancement. For these patients, the clinical and neuroradiological follow-up periods could be reduced.
Youn HyunChul,Lee Kang Joon,Kim Shin-Gyeom,Cho Seong-Jin,Kim Woo Jung,Lee Won Joon,Hwang Jae Yeon,Han Changsu,Shin Cheolmin,Jung Han-yong 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.3
Objective This study aimed to investigate treatment effects of combination therapy of memantine and acetylcholinesterase inhibitors (AchEIs) compared with AchEIs alone on behavioral and psychological symptoms of dementia (BPSD) in patients with moderate Alzheimer’s dementia (AD).Methods This was a 12-week, double-blind, randomized, placebo-controlled trial. A total of 148 patients with moderate AD participated in this study. Mini-Mental State Examination, Neuropsychiatric Inventory (NPI), Clinician’s Interview-Based Impression of Change plus caregiver input, Gottfries–Bråne–Steen Scale, and Zarit Burden Interview were used as assessment scales.Results There were no significant differences in age, sex, or education between AChEIs alone and combination groups. The combination group showed significantly more improvement of NPI-disinhibition score (0.76±2.15) than the AChEIs alone group (-0.14±1.71) after 12 weeks.Conclusion Our findings suggest that the combination therapy of memantine and AchEIs might be a beneficial option for reducing disinhibition symptoms of patients with moderate AD compared with AchEIs alone. We believe that clinicians need to consider additional memantine treatment when patients with moderate AD complain disinhibition symptom. A larger clinical trial is needed to further determine the efficacy and advantages of such combination therapy of memantine and AchEIs for treating BPSD of patients with moderate AD.
지상파 DMB 재난경보방송 수신기 표준적합성 시험 항목 연구
정현철(Jung Hyunchul),전인찬(Jeon Inchan),최성종(Choi Seong Jong) 한국방송·미디어공학회 2009 한국방송공학회 학술발표대회 논문집 Vol.2009 No.11
지상파 DMB가 널리 보급되고, 이를 활용한 재난경보서비스가 시험방송을 준비 중이다. 그러나 검증되지 않은 수신기들이 대량으로 출시되어 BIFS 대란과 같은 문제점도 발생하였다. 재난경보방송은 정확한 정보 전달이 매우 중요하므로, 이와 같은 문제가 발생하지 않도록 하기 위한 ‘지상파 디지털멀티미디어방송(DMB) 재난경보방송 수신기 표준적합성 시험'을 두고 있다. 이 표준을 분석한 결과 추가되어야 할 시험 방목이 몇 가지 발견되었다. 이 논문에서는 ‘지상파 디지털멀티미디어방송(DMB) 재난경보방송’의 메시지 포맷을 분석하여 각 필드가 모순되는 경우와, 사용하지 않는 값이라 명시하였으나 시험 항목에 누락된 부분을 파악하여 보충하였다. 이러한 시험 항목을 이용하면 표준을 보완하고, 결함이 더 적은 수신기를 개발하는데 도움이 될 것이다.