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Young Yun,Han-Nah Joh,Young-Bae Park,Se-Ho Kim 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this work, a 3D capacitive coupling structure employing periodic pattern was used for application to miniaturized on-chip passive components on MMIC (Monolithic Microwave Integrated Circuit). Unlike conventional periodic structure, the characteristic impedance of the 3D capacitive coupling structure was hardly dependent on frequency. Using the 3D capacitive coupling structure, RF passive component was highly miniaturized in comparison with conventional one.
Young Yun,Ji-Won Jung,Ki-Man Kim,Hae-Cheon Kim,Woo-Jin Chang,Hong-Gu Ji,Ho-Kyun Ahn IEEE 2007 IEEE microwave and wireless components letters Vol.17 No.10
<P>Using a periodically perforated ground metal (PPGM) on GaAs monolithic microwave integrated circuit (MMIC), a microstrip line structure with a high isolation characteristic between lines was developed. The high isolation characteristic was originated from a resonance between adjacent microstrip lines employing PPGM. According to experimental results, a much better isolation characteristic was observed from the adjacent microstrip lines employing PPGM compared with conventional microstrip lines, and the frequency range for high isolation was easily controlled by changing the PPGM structure. Above results indicate that microstrip lines employing PPGM are very useful for application to compact signal/bias lines of highly integrated MMIC requiring a high isolation characteristics between lines.</P>
YOUNG YUN 인하대학교 다문화융합연구소 2023 다문화와 교육 Vol.8 No.2
The foreign resident population in the Republic of Korea accounts for approximately 4.37% of the total population. To foster coexistence in a multicultural society, effective communication among diverse individuals is crucial. However, there is a lack of comprehensive research on the current state of Korean Language and Cultural Education for multicultural members, particularly focusing on marriage immigrants and their children. Therefore, this study aims to examine existing Korean language education programs and identify the challenges and issues faced by marriage immigrants and multicultural children. In-depth interviews were conducted with six Korean language instructors specializing in teaching these groups to gain a deeper understanding of the on-site situations and issues. Based on the results, this study proposes the direction for Korean Language and Cultural Education for marriage immigrants and multicultural children. This research is significant as it suggests the necessary direction for Korean Language and Cultural Education based on the direct and practical opinions of instructors who work with marriage immigrants and multicultural children, rather than relying solely on existing theories or materials.
The Relationship between Depressive Symptoms and Modifiable Lifestyle Risk Factors in Office Workers
Jin, Youngyun,Ha, Changduk,Hong, Hyeryun,Kang, Hyunsik Korean Society for the Study of Obesity 2017 Journal of obesity & metabolic syndrome Vol.26 No.1
<P><B>Background</B></P><P>This study investigated the relationship between depressive symptoms and physical fitness, obesity indices, and vitamin D status in office workers.</P><P><B>Methods</B></P><P>The subjects were 514 adults with more 30 years of experience as office workers in the city of Seoul. Lifestyle risk factors, obesity indices, physical fitness, and serum vitamin D levels were assessed with a standardized protocol. The Beck Depression Inventory (BDI) was used to assess depression status. Vitamin D status was assessed by measuring serum 25-hydroxyvitamin D concentrations. Based on the BDI scores, participants were classified into no depression (ND, BDI ≤9), mild depression (MiD, 10≤BDI≤15), and moderate depression (MoD, 16≤BDI≤23) groups.</P><P><B>Results</B></P><P>Compared with the high cardiorespriatory fitness group, the low cardiorespiratory fitness (men OR=2.618, women OR=1.596) an middle cardiorespiratory fitness group (men OR=1.256, women OR=1.110) had significantly higher odds ratio for having depressive symptoms, even after adjustment for age, hypertension, diabetes, hyperlipidemia, cardiovascular disease, alcohol intake, smoking, body mass index (BMI), percent body fat (%BF), and waist circumference (WC). Compared with the insufficient or deficient vitamin D group, the sufficient vitamin D group had significantly lower odds ratios for having depressive symptoms (men OR=0.121, women OR=0.114), even after adjustment for age, hypertension, diabetes, hyperlipidemia, cardiovascular disease, alcohol intake, smoking, BMI, %BF, and WC.</P><P><B>Conclusion</B></P><P>Vitamin D supplementation and outdoor activities should be key components of a lifestyle intervention against office workers’ depression.</P>