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Cho, Ara,Banu, Shahara,Cho, Yunae,Ahn, Seung Kyu,Yun, Jae Ho,Cho, Jun-Sik Elsevier 2019 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.185 No.-
<P><B>Abstract</B></P> <P>Hybrid inks with a chelating agent were prepared and coated by a spin-coating method to form Cu<SUB>2</SUB>SnS<SUB>3</SUB> (CTS) thin films. After the coating, a subsequent sulfurizing process via rapid thermal annealing was performed. During the sulfurization, the Cu and Sn precursors in the hybrid inks exist in complex forms with chelates and these complexes help to form the CTS thin films by controlling the reaction rate of the metal precursors. Additionally, even though the complexes with chelates were formed, the oxidation numbers of the metal precursors were affected by the ionization tendency of each metal in the hybrid inks to form the semiconducting CTS thin films. After obtaining the optimum sulfurizing condition by controlling the reaction pressure and temperature, the CTS thin films were characterized and CTS solar cells were fabricated under these conditions. The best conversion efficiency of the fabricated cells was 2.953% and the temperature-dependent photovoltaic performances were also examined to investigate the carrier transport mechanisms of the devices. According to admittance spectroscopy, the dominant defect energy level was determined as 0.09 eV above the valence band minimum, which accords with the copper vacancy (<I>V<SUB>Cu</SUB> </I>) level. In addition, capacitance–voltage measurements and drive-level capacitance profiling were applied to demonstrate the carrier densities and defect behaviors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The chelating effect of metal-chelate complexes in hybrid ink can control reaction rate to form pure Cu<SUB>2</SUB>SnS<SUB>3</SUB> thin films. </LI> <LI> Metal-chelate complex helped to form pure Cu<SUB>2</SUB>SnS<SUB>3</SUB> by maintaining oxidation number of Cu and Sn. </LI> <LI> To investigate the carrier transport mechanisms, temperature-dependent As and DLCP analyses were conducted. </LI> <LI> The main defects were related to the <I>V<SUB>Cu</SUB> </I> acceptor. </LI> </UL> </P>
Cho, Ara,Lee, Jung Joon,Koh, Jae Hyun,Wang, Anjie,Moon, Sang Heup Royal Society of Chemistry 2007 GREEN CHEMISTRY Vol.9 No.6
<P>Different types of NiMoS/Al<SUB>2</SUB>O<SUB>3</SUB> catalysts were prepared by a combination of sonochemical synthesis and chemical vapor deposition (CVD) methods. The performance of the prepared catalysts in the hydrodesulfurization (HDS) of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) was compared with that of catalysts prepared using the impregnation method. Ni that was selectively added to the MoS<SUB>2</SUB> surface by CVD promoted the HDS activity to a greater extent than Ni added by impregnation, particularly for the direct-desulfurization (DDS) route of the reaction. This was attributed to the former method allowing an intimate interaction between the added Ni and the MoS<SUB>2</SUB> surface, as confirmed by the XPS analysis of the catalysts. NiMoS/Al<SUB>2</SUB>O<SUB>3</SUB> prepared by a combination of two methods, sonochemical and CVD, showed improvement in activity over the catalyst prepared by impregnation. Moreover, the hydrogenation (HYD) activity of the former catalyst was significantly higher than that of the latter due to the dominant effect of sonochemical synthesis on the activity. The improvement in activity was greater for the HDS of 4,6-DMDBT than for the HDS of DBT.</P> <P>Graphic Abstract</P><P>NiMoS/Al<SUB>2</SUB>O<SUB>3</SUB> catalysts prepared by a combination of sonochemical synthesis and chemical vapor deposition methods showed higher HDS activities than those prepared by impregnation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b614273g'> </P>
Clinical Manifestations and Surgical Treatment Outcomes of Paranasal Sinus Osteoma
Cho Ara,Jung Youngrak,Park Ju Ha,Jeong Yeonsu,Cho Hyung-Ju 대한비과학회 2022 Journal of rhinology Vol.29 No.1
Background and Objectives: Osteomas are the most common benign tumors of the nasal cavity and paranasal sinuses (PNSs). In this study, clinical features and imaging findings were analyzed in patients with osteoma confirmed by ostiomeatal unit (OMU) computed tomography (CT) and PNS CT, and the surgical treatment performed at our hospital was introduced.Methods: The Severance Clinical Research Analysis Portal (SCRAP) service of Severance Hospital was used to collect research data. A total of 128 cases of osteomas of the nasal cavity or PNSs confirmed by OMU CT or PNS CT was retrospectively reviewed, including the location and size of the osteoma, clinical features, accompanying findings on imaging tests, and cases of surgical treatment.Results: In this study, osteomas were found in about 0.55% of patients who underwent computed tomography. Osteomas were most frequently found in the ethmoid sinus, followed by the frontal sinus, fronto-ethmoid sinus, maxillary sinus, intranasal sphenoid sinus, and maxillary sinus-ethmoid sinus. Patients with osteomas complained of symptoms such as rhinorrhea, postnasal drip, nasal congestion, hyposmia, headache, visual disturbance, and lacrimal duct obstruction.Conclusion: Surgical treatment was considered for patients presenting with severe headache, visual field symptoms, or accompanying rhinosinusitis. Surgery was performed by endoscopic or external approaches depending on location and size of the osteoma.
Protective effects of red ginseng extract against vaginal herpes simplex virus infection
Ara Cho,Yoon Seok Roh,Erdenebileg Uyangaa,Surim Park,Jong Won Kim,Kyu Hee Lim,Jungkee Kwon,Seong Kug Eo,Chae Woong Lim,Bumseok Kim 고려인삼학회 2013 Journal of Ginseng Research Vol.37 No.2
Numerous studies have suggested that Korean red ginseng (KRG) extract has various immune modulatory activities both in vivo and in vitro. In this study, we used a mouse model to examine the effects of orally administered KRG extract on immunity against herpes simplex virus (HSV). Balb/c mice were administered with 100, 200, and 400 mg/kg oral doses of KRG extract for 10 d and then vaginally infected with HSV. We found that KRG extract rendered recipients more resistant against HSV vaginal infection and further systemic infection, including decreased clinical severity, increased survival rate, and accelerated viral clearance. Such results appeared to be mediated by increased vaginal IFN-γ secretion. Moreover, increased mRNA expression of IFN-γ, granzyme B, and Fas-ligand was identified in the iliac lymph node and vaginal tracts of KRG extract treated groups (200 and 400 mg/kg). These results suggest that the activities of local natural killer cells were promoted by KRG extract consumption and that KRG may be an attractive immune stimulator for helping hosts overcome HSV infection.
Decreased Serum Cocaine- and Amphetamine-Regulated Transcript Level in Internet Gaming Disorder
Ara Cho,Heejin Lee,Dong Huey Cheon,So Young Yoo,Arom Pyeon,Ji-Won Chun,Ji Hyun Back,Yae Eun Park,Dai-Jin Kim,Ji Eun Lee,Jung-Seok Choi 대한신경정신의학회 2024 PSYCHIATRY INVESTIGATION Vol.21 No.7
Objective Vulnerability to internet gaming disorder (IGD) has increased as internet gaming continues to grow. Cocaine- and amphetamine-regulated transcript (CART) is a hormone that plays a role in reward, anxiety, and stress. The purpose of this study was to identify the role of CART in the pathophysiology of IGD. Methods The serum CART levels were measured by enzyme-linked immunosorbent assay, and the associations of the serum CART level with psychological variables were analyzed in patients with IGD (n=31) and healthy controls (HC) (n=42). Results The serum CART level was significantly lower in the IGD than HC group. The IGD group scored significantly higher than the HC group on the psychological domains of depression, anxiety, the reward response in the Behavioral Activation System and Behavioral Inhibition System. There were no significant correlations between serum CART level and other psychological variables in the IGD group. Conclusion Our results indicate that a decrease in the expression of the serum CART level is associated with the vulnerability of developing IGD. This study supports the possibility that CART is a biomarker in the pathophysiology of IGD. Psychiatry Investig 2024;21(7):755-761
Protective effects of red ginseng extract against vaginal herpes simplex virus infection
Cho, Ara,Roh, Yoon Seok,Uyangaa, Erdenebileg,Park, Surim,Kim, Jong Won,Lim, Kyu Hee,Kwon, Jungkee,Eo, Seong Kug,Lim, Chae Woong,Kim, Bumseok The Korean Society of Ginseng 2013 Journal of Ginseng Research Vol.37 No.2
Numerous studies have suggested that Korean red ginseng (KRG) extract has various immune modulatory activities both in vivo and in vitro. In this study, we used a mouse model to examine the effects of orally administered KRG extract on immunity against herpes simplex virus (HSV). Balb/c mice were administered with 100, 200, and 400 mg/kg oral doses of KRG extract for 10 d and then vaginally infected with HSV. We found that KRG extract rendered recipients more resistant against HSV vaginal infection and further systemic infection, including decreased clinical severity, increased survival rate, and accelerated viral clearance. Such results appeared to be mediated by increased vaginal IFN-${\gamma}$ secretion. Moreover, increased mRNA expression of IFN-${\gamma}$, granzyme B, and Fas-ligand was identified in the iliac lymph node and vaginal tracts of KRG extract treated groups (200 and 400 mg/kg). These results suggest that the activities of local natural killer cells were promoted by KRG extract consumption and that KRG may be an attractive immune stimulator for helping hosts overcome HSV infection.