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Ryu, Yoon-Kyong,Kim, Cho-Rong,Kim, Chi-Won,Noh, Tae-Hwan,Jung, Ok-Sang Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.10
Ionic palladium(II) complex containing a long aliphatic chain, [(tmeda)$PdL]_2(PF_6)_4$ (tmeda = N,N,N',N'-tetramethylethylenediamine; L = decylmethylbis(m-pyridyl)silane) allowed to form a puckered submicrosphere morphology without any template or additive. The puckered spheres reversibly adsorb and desorb dioxane molecules. Coligand and cosolvent effects on the formation of submicrospherical morphology were observed.
Phenomenological Analysis of Fun Experiences among College Intramural Sports Athletes
( Won Shick Ryu ),( Kwang Bong Suh ),( Sung Bum Chun ) 한국체육학회 2017 International journal of human movement science Vol.11 No.2
This study aimed to examine the fun experiences of the President’s Cup participants from Y University. A total of nine participants were selected from soccer, baseball, and basketball athletes who were currently participating in the intramural league through snow-ball sampling. Data was collected from interviews and the observation of the intramural sports athletes. Coding was conducted as a first step, and group categorization followed. For the validity of the study, a peer review was conducted by one leisure studies professor and two doctoral students of leisure studies. After the data analysis, the motivation for President’s Cup participation, impression changes regarding the President’s Cup, addiction to the President’s Cup, and fun factor of the President’s Cup were drawn as the results. Building interpersonal relationships, improvement of skills, and desire to participate in the event regularly were found as the sub-factors of fun experience concerning the President’s Cup.
Development of Planar Schottky Diode on GaAs Substrate for Terahertz Applications
Won-Young Uhm,Seok-Gyu Choi,Min Han,Keun-Kwan Ryu,Sung-Chan Kim 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
In this paper, we demonstrate the planar Schottky diode on GaAs substrate for terahertz applications. A nanoscale dot and T-shaped disk has been developed as the anode for terahertz Schottky diode. The low parasitic elements of the nanoscale anode with T-shaped disk yield high cutoff frequency characteristic. The fabricated Schottky diode with anode diameter of 500 nm has series resistance of 21 Ω, ideality factor of 1.32, junction capacitance of 8.03 fF, and cutoff frequency of 944 GHz.
( Sung Woo Ryu ),( Gene Hyun Bok ),( Jae Young Jang ),( Soung Won Jeong ),( Nam Seok Ham ),( Ji Hye Kim ),( Eui Ju Park ),( Jin Nyoung Kim ),( Woong Cheul Lee ),( Kwang Yeun Shim ),( Sae Hwan Lee ),( 대한소화기학회 2014 Gut and Liver Vol.8 No.3
Background/Aims: To evaluate the diagnostic value of contrast (SonoVue®) enhancement ultrasonography (CEUS) and to compare this method with computed tomography (CT) and magnetic resonance imaging (MRI) in evaluating liver masses. Methods: CEUS (n=50), CT (n=47), and MRI (n=43) were performed on 50 liver masses in 48 patients for baseline mass characterization. The most likely impression for each modality and the final diagnosis, based on the combined biopsy results (n=14), angiography findings (n=36), and clinical course, were determined. The diagnostic value of CEUS was compared to those of CT and MRI. Results: The final diagnosis of the masses was hepatocellular carcinoma (n=43), hemangioma (n=3), benign adenoma (n=2), eosinophilic abscess (n=1), and liver metastasis (n=1). The overall diagnostic agreement with the final diagnosis was substantial for CEUS, CT, and MRI, with κ values of 0.621, 0.763, and 0.784, respectively. The sensitivity, specificity, and accuracy were 83.3%, 87.5%, and 84.0%, respectively, for CEUS; 95.0%, 87.5%, and 93.8%, respectively, for CT; and 94.6%, 83.3%, and 93.0%, respectively for MRI. After excluding the lesions with poor acoustic sonographic windows, the sensitivity, specificity, and accuracy for CEUS were 94.6%, 87.5%, and 93.3%, respectively, with a κ value of 0.765. Conclusions: If an appropriate acoustic window is available, CEUS is comparable to CT and MRI for the diagnosis of liver masses.
Sung, Soo-Hyun,Shin, Byung-Cheul,Park, Min-Jung,Kim, Kyeong Han,Kim, Ji-Won,Ryu, Ji-Yeon,Park, Jang-Kyung KOREAN PHARMACOPUNCTURE INSTITUTE 2019 Journal of pharmacopuncture Vol.22 No.2
Objectives: Pharmacopuncture is a new form of acupuncture treatment that injects herbal medicine into acupuncture points. This paper introduces the management status of pharmacopuncture through accreditation, and examines the effect of accreditation on pharmacopuncture management. Methods: The Accreditation System of External Herbal Dispensaries (EHDs) of traditional Korean medicine clinics announced by the Ministry of Health and Welfare in September 2018 were investigated. Results: The Accreditation System of EHDs assesses and certifies herbal medicine and pharmacopuncture preparations. Regular components for the 'pharmacopuncture' certification consist of nine standards, 30 categories, and 165 items. The nine standards include: herbal dispensary facilities, clean room management, management and organization operation, employee management, document management, continuous quality control, herbal medicine management, management of preparation, and pavement management. Conclusion: Through EHD accreditation and certification system, traditional Korean medicine clinics and EHDs can now manage pharmacopuncture medicine quality and promise safe pharmacopuncture treatment for the people.
Dry etching of copper thin films in high density plasma of CH<sub>3</sub>COOH/Ar
Ryu, Jin Su,Lim, Eun Taek,Choi, Jae Sang,Chung, Chee Won Elsevier S.A. 2019 Thin Solid Films Vol.672 No.-
<P><B>Abstract</B></P> <P>Inductively coupled plasma reactive ion etching of copper thin films patterned with SiO<SUB>2</SUB> masks was carried out using CH<SUB>3</SUB>COOH/Ar gas. The etch rate, etch selectivity to SiO<SUB>2</SUB> mask, and the etch profiles of copper films were examined. The evolution study of the etch profile as a function of gas concentration and etch depth revealed the etch sequence and etch mechanism. In the optimized CH<SUB>3</SUB>COOH/Ar gas, the systematic approach on the etch characteristics of copper films was performed by changing the etch parameters including inductively coupled plasma (ICP) rf power, dc-bias voltage to substrate, and process pressure. As the ICP rf power and dc-bias voltage increased and the process pressure decreased, the etch rate increased and the etch profile improved. X-ray photoelectron spectroscopy was used to determine the etch mechanism in CH<SUB>3</SUB>COOH/Ar gas. Finally, the etching of copper films in the CH<SUB>3</SUB>COOH/Ar was achieved with good etch profile with a high degree of anisotropy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Etching of Cu films in CH<SUB>3</SUB>COOH/Ar gas was investigated. </LI> <LI> Good etch profile with high degree of anisotropy were obtained in 100% CH<SUB>3</SUB>COOH. </LI> <LI> Analyses confirmed the formation of Cu compounds and polymer layers on the films. </LI> <LI> Effects of etch parameters on the etch characteristics were investigated. </LI> </UL> </P>
Ryu, Ka Yeon,Sung, Dan-Bi,Won, Suk-Young,Jo, Ara,Ahn, Kyusang,Kim, Hyun Yeong,ArulKashmir, Arulraj,Kwak, Kyungwon,Lee, Chongmok,Kim, Won-Suk,Kim, Kyungkon Elsevier 2018 Dyes and pigments Vol.149 No.-
<P><B>Abstract</B></P> <P>New small molecular semiconductors with small band gap and low-lying highest occupied molecular orbital (<I>E</I> <SUB>HOMO</SUB>), namely TBDPPOT, TBDPPEH, and TBDPPEHT4 were synthesized by incorporating the B←N bridged thienylthiazole and diketopyrrolopyrrole (DPP) derivatives. TBDPPOT and TBDPPEH were prepared, respectively, using two different DPPs having 1-octyl and 2-ethylhexyl moiety as the solubilizing group. In addition, the band gap of the TBDPPEH is further reduced by introducing planar thienothiophene unit, which was used for the preparation of TBDPPEHT4. These synthesized SMs are blended with fullerene derivative to construct a photo-active layer for organic photovoltaics. Among OPVs utilizing those SMs, the TBDPPEH exhibits highest power conversion efficiency of 3.21% with an exceptionally high <I>V</I> <SUB>OC</SUB> of 0.92 V, which is ascribed to low-lying HOMO energy level of −5.62 eV. It is expected that the utilization of TBDPPEH as a photo-active layer for OPVs would enhance the oxidation stability of the OPVs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Small molecular semiconductors with low-lying HOMO were synthesized. </LI> <LI> These molecules contain B←N bridged thienylthiazole and diketopyrrolopyrrole derivatives. </LI> <LI> Solar cell based on those molecules exhibited high <I>V</I> <SUB>OC</SUB> values. </LI> </UL> </P>