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Host People's Kindness and Migrant Workers' Cultural Adaptation: Evidence from South Korea
Jihyun Ryou(Jihyun Ryou),Sang-Yeon Kim(Sang-Yeon Kim) 한국학술연구원 2022 Korea Observer Vol.53 No.4
This study purports to determine the predictors of migrant workers' cultural adaptation in South Korea. In the main, we examined the extent to which the level of inter-/intracultural socializing, exposure to local/native media, and host culture receptivity affect the level of cultural adaptation in cognitive, affective, behavioral domains. Potential impacts of demographic factors (e.g., age, sex, ethnicity, marital status, living alone vs. with family, education level, residency in years, perceived cultural similarity) were also explored. To find answers to the research questions, a total of 634 migrant workers from 37 different nations were reached using a snowball sampling. Surveys were collected in 12 districts of Seoul, the capital of South Korea, and 21 adjacent metropolitan areas. Results indicate that intercultural interaction with host people and media exposure to local contents tend to help improve their knowledge about South Korea (e.g., language, culture). With all else equal, migrant workers treated kindly by Koreans at the workplace and in service sectors, and those living with family, compared to those who live alone, tended to enjoy a greater satisfaction with work and life in South Korea and were more willing to stay. Practical implications for Korean policymakers include encouraging competent migrant workers to move together with the family, making administrative efforts to further simplify the documentation process, and initiating public campaigns to raise host culture receptivity among Korean citizens.
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Hierarchical CRGK Supporting a Secure Multicast Communication for a Large Number of Users
PARK, Jihyun,LEE, Jeongsu,KIM, Jeonghyun,RYOU, Jaecheol The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.4
<P>A multicast content service, including numerous devices, requires an efficient group key management scheme as one of its core components. The purpose of group key management is to provide a secure key-sharing scheme among the members of a group so that messages transmitted via broadcasting or multicasting are not exposed to non-members. The Chinese Remaindering Group Key (CRGK) is an efficient group key management scheme based on the Chinese Remainder Theorem (CRT). It optimizes the number of re-key messages, the user-side key computation cost, and the number of stored keys. However, CRGK is not fit for a group with a large number of members because of the high computation complexity of the CRT. In this paper, we propose a Hierarchical CRGK (HCRGK) scheme that supports a group with a large number of members. We improved CRGK by adopting it to include an <I>n</I>-ary tree structure. The tree approach simplifies the group key management by distributing the group key computation to subgroups. Our scheme requires at most (log<I><SUB>m</SUB>N</I> + 1) re-key messages for a group with <I>N</I> members and a short computation time even when the group is very large.</P>
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( William B Titlow ),( Muhammad Waqas ),( Jihyun Lee ),( Jae Youl Cho ),( Sang Yeol Lee ),( Dae Hwan Kim ),( Chongsuk Ryou ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.9
Prion diseases are incurable neurodegenerative disorders. Our previous study demonstrated that polylysine was effective in prolonging the incubation period in a rodent model and in alleviating the scrapie prion protein (PrPSc) burden in the brain at the terminal stage of the disease. Here, we report that intraperitoneal administration of polylysine suppresses the accumulation of prions in the spleen during the early stages of the disease. This study supports the congruence of PrPSc inhibition by polylysine in both the spleen and brain.
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Na, Han Gil,Jung, Taek-Kyun,Ryou, Min,Lee, Ji-Woon,Beck, Jihyun,Hyun, Soong-Keun,Choi, Myung Sik,Mirzaei, Ali,Choe, Kyeonghwan,Kim, Hyoun Woo,Jin, Changhyun ELSEVIER SCIENCE 2017 Journal of Alloys and Compounds Vol.695 No.-
<P><B>Abstract</B></P> <P>TeO<SUB>2</SUB> nanowires with diameters ranging from a few tens to hundreds of nanometers and lengths of a few tens of micrometers were prepared by thermal evaporation of Te powder with a Co catalyst. Initially, bead-like γ-TeO<SUB>2</SUB> nanoparticles on the surface of pre-formed thick TeO<SUB>2</SUB> nanowires were heterogeneously formed. Subsequently, uniform thin TeO<SUB>2</SUB> nanowires without the γ-TeO<SUB>2</SUB> phase were homogeneously synthesized by changing only the inlet N<SUB>2</SUB> gas flow rates and keeping other process parameters constant. The morphological and microstructural evolution of the two different nanomaterials was examined by X-ray diffraction, energy-dispersive X-ray spectrometry, and scanning and transmission electron microscopy. The optical properties of the nanomaterials were also investigated using photoluminescence spectroscopy. The emission peaks in the PL measurement without the supply of N<SUB>2</SUB> gas showed a synergetic effect between (1) bead-like orthorhombic γ-TeO<SUB>2</SUB> nanoparticles that show two specific emission bands at 388 nm and 590 nm; and (2) uniform tetragonal TeO<SUB>2</SUB> nanowires that show a characteristic emission band at 440 nm. In contrast, the pure tetragonal TeO<SUB>2</SUB> nanostructures synthesized under a N<SUB>2</SUB> gas flow rate of 2 standard liters per minute flow rate revealed a red-shifted emission band at 450 nm compared to heterogeneous structures of the same composition. The origins of the growth and emission mechanisms in the different TeO<SUB>2</SUB> structures are also discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The hybrid system of TeO<SUB>2</SUB>-based nanostructures was investigated. </LI> <LI> Two different TeO<SUB>2</SUB> properties may have originated from different gas flows. </LI> <LI> Morphological, microstructural, and optical transition was observed. </LI> </UL> </P>
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Mycosporine-like amino acids (MAAs) 처리에 따른 배양세포 내 스크래피 프리온 단백질의 형성증가
이지현,모상현,류종석,김대환,Lee, Jihyun,Moh, Sang-Hyun,Ryou, Chongsuk,Kim, Dae-Hwan 한국미생물·생명공학회 2015 한국미생물·생명공학회지 Vol.43 No.2
Prion은 양의 scrapie, 소의 bovine spongiform encephalopathy와 사람의 CJD와 같은 다양한 신경 퇴행성 질환을 유발시키는 단백질 병원체이다. 정상 prion 단백질인 PrP<sup>C</sup>가 병원성 PrP<sup>Sc</sup>로 바뀌는 과정에 대해서는 많은 연구가 진행되었고, PrP<sup>Sc</sup>로의 단백질 구조 변화가 다양한 환경적 요소에 의해서 영향 받는 것으로 추측된다. 바다조류로부터 분리된 MAAs는 다양한 스트레스 환경에서 조류를 보호해주는 것으로 알려져 있다. 이와 같은 사실에 기초하여 mycosporineglycine, porphyra-334와 shinorine 3종의 MAAs로 처리한 prion 감염 신경세포 주에서 prion 단백질 축적의 변화를 평가하였다. PK 저항성을 갖는 PrP<sup>Sc</sup>를 western blot 방법으로 확인한 결과, MAA에 의해서 PrP<sup>Sc</sup> 단백질의 증식을 관찰하였다. Prions are proteinaceous infectious particles that cause neurodegenerative diseases, such as scrapie in sheep, bovine spongiform encephalopathy in cattle and Creutzfeldt-Jakob disease (CJD) in humans. Although the detailed process, regarding the abnormal conversion of prion proteins (PrP), remains to be fully elucidated, a number of environmental factors appear to affect the formation of misfolded PrP, termed PrP<sup>Sc</sup>. Because oceanic algae contain mycosporine-like amino acids (MAAs), which exhibit cellular defensive activities under a variety of stress conditions, we investigated the level of PrP<sup>Sc</sup> in prion-infected neuroblastoma cells using mycosporine-glycine, porphyra-334 and shinorine. When judged by the level of protease-resistant PrP<sup>Sc</sup> in western blots, porphyra-334 and shinorine increased the level of PrP<sup>Sc</sup> in cells, but mycosporine-glycine did not. The current results indicate that the MAAs tested in this study enhance the formation of PrP<sup>Sc</sup>.
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