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Namgoong, Jin Woong,Kim, Se Hun,Chung, Sei-Won,Kim, Young Hoon,Kwak, Moo Sun,Kim, Jae Pil Elsevier 2018 Dyes and pigments Vol.154 No.-
<P><B>Abstract</B></P> <P>In the development of display devices, a color filter is still considered an indispensable component. For a thinner display panel, the thickness of the color filter also needs to be decreased. However, if the thickness of the color filter is reduced, the color properties, including the color purity and color gamut are simultaneously diminished. Therefore, introduction of new colorants is needed to lower the thickness without diminishing the color performance. In this study, four phthalocyanine green dyes were synthesized for use in color filters. The molecular geometry and absorption properties were predicted by density functional theory (DFT) and time-dependent DFT, and UV-Vis spectroscopy was employed to measure the optical properties. The thermal stabilities of the dyes were examined by thermogravimetric analysis. A dye with suitable solubility and color properties was adopted in the color filter, and the optical properties and thickness of the dye-based color filter were compared to those of the pigment-based color filter. The chromatic performance and thickness of the color filter were determined by color spectrometry and Alpha step, respectively. Finally, we confirmed that the dye could enable the decrease in the thickness of the filter and provide a superior color property.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Chloro- substituted (α positions) zinc phthalocyanine (Dye 3b) possessed a saddle core structure. </LI> <LI> The enhancing bulkiness inhibits the π-π stacking of the phthalocyanine molecules, thus increasing solubility. </LI> <LI> The dye decreases a thickness of color filter by 20%, owing to its higher color strength than that of pigments. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Design of cyclotron magnet with tenth harmonics for accelerator mass spectrometry
Namgoong Ho,Choi Hyojeong,Ha Donghyup,Ghergherehchi Mitra,Chai J. S.,Lee Jongchul 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.2
In this study, we developed a carbon-beam cyclotron for accelerator mass spectrometry (AMS). A cyclotron magnet for AMS was developed for particle acceleration systems using cyclotrons rather than the tandem accelerator used in conventional accelerator mass spectrometry systems. Design parameters were selected for the development of cyclotrons for AMS, and the magnetic feld design and equilibrium orbit (EO) analysis beam trajectory were analyzed using the Cyclone and CST Microwave Studio. Additionally, by measuring the magnetic feld of the manufactured cyclotron, magnetic feld optimtableization was performed through shimming, and the beam trajectory was verifed based on the measurement results. The cyclotron magnet was designed with a mass resolution of 2890, with harmonic 10 and turn number 92. The minimum turn separation was optimized at 2 mm to reduce the loss caused by the collision of the beam during acceleration. This cyclotron for AMS could accelerate the 12C−, 13C−, and 14C− particles at 40 keV to obtain a beam of 400 keV.
Namgoong, Jin Woong,Chung, Sei-Won,Jang, Hyeyoun,Kim, Young Hoon,Kwak, Moo Sun,Kim, Jae Pil Elsevier 2018 Journal of industrial and engineering chemistry Vol.58 No.-
<P><B>Abstract</B></P> <P>Four synergists were synthesized to enhance pigment nanoparticles dispersion and the contrast ratio. The interaction between the synergist and the dispersant was confirmed by infra-red (IR) spectrometry. We demonstrate that the hydrogen bonds forming between the synergist and the dispersant act as a key factor. To analyze the dispersion properties, dynamic light scattering (DLS), and electron microscopic analysis was examined. The spectral and color characteristics was also measured by UV–vis spectrometry and colorimetry, and the contrast ratio of color filters was evaluated. This study confirms that the prepared synergist can increase the contrast ratio of green color filter.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Namgoong Jung-Man,Hwang Shin,Kim Dae-Yeon,Ha Tae-Yong,Song Gi-Won,Jung Dong-Hwan,Kim Kyung Mo,Oh Seak Hee 대한이식학회 2021 Korean Journal of Transplantation Vol.35 No.1
Congenital absence of the portal vein (CAPV) is a rare venous malformation in which mesenteric venous blood drains directly into systemic circulation. Herein, we report a case of pediatric deceased donor liver transplantation (DDLT) for symptomatic CAPV with whole liver graft from a hepatitis B surface antigen (HBsAg)-positive donor. A 4-year-old boy suffered from CAPV and secondary portal hypertension. He was also diagnosed with DiGeorge syndrome and heart anomalies. After waiting for 4 months, a 5-year-old donor weighing 19 kg with positive HBsAg was allocated to this 4-year-old patient weighing 15 kg. Recipient operation was performed according to the standard procedures of pediatric DDLT. Portal vein reconstruction was performed using interposition of a vascular homograft conduit to the superior mesenteric vein-splenic vein confluence. The patient recovered uneventfully from DDLT. He has been administered with lamivudine to prevent hepatitis B virus infection. This patient has been doing well for 5 years after DDLT without growth retardation. In conclusion, CAPV patients can have various vascular anomalies, thus combined vascular anomalies should be thoroughly assessed before and during liver transplantation operation. The most effective reconstruction techniques should be used to achieve satisfactory results following liver transplantation.
Namgoong Jung-Man,Hwang Shin,Kim Dae-Yeon,Ha Tae-Yong,Song Gi-Won,Jung Dong-Hwan,Kim Kyung Mo,Oh Seak Hee 대한이식학회 2021 Korean Journal of Transplantation Vol.35 No.1
Congenital factor X (FX) deficiency is a rare autosomal-recessive disease that induces bleeding disorder. Herein, we present the 10-year posttransplant course of a pediatric patient who underwent liver transplantation (LT) with portal vein (PV) stenting for correction of severe congenital FX deficiency, with focus on long-term maintenance of coagulation function and patency of PV stenting. A 17-month-old infant with recurrent hemorrhagic episodes due to FX deficiency underwent split LT using a left lateral section graft. The graft-recipient weight ratio was 2.2%. The graft implantation procedures were performed by following the standard pediatric split LT procedure. Nevertheless, a wall stent was inserted due to PV anastomotic stenosis on posttransplant day 1. Graft function recovered slowly because of partial parenchyma infarct, and the patient was discharged at 46 days after LT operation. The FX activity started to increase soon after LT and gradually normalized; the coagulation profiles have been maintained well for the past 10 years. The patient has been doing well for the past 10 years after LT without any episodes of abnormal bleeding. Due to the risk of vascular complications owed to PV stenting, life-long follow-up is mandatory with special attention until attainment of complete physical growth to adolescent and adulthood.