• Journal of the Economic Geographical Society of Korea
• /
• v.21 no.4
• /
• pp.370-392
• /
• 2018

This study aims to reveal that the changes in the population and housing consumption of foreigners, which are constantly undergoing structural changes, affect both the housing market of home and host country. The cause and the change of foreigners' housing market in Seoul were analyzed to be that the foreigners' continuous inflows occurred due to the 'fixed effect of rent' on the rental market, which is different from the domestic housing market. Korean-Chinese, who tend to be circular migration, make the current concentration of the housing market. Meanwhile, Korean-Chinese, who have experienced migration from Korea, emerged as major housing consumers, causing a real estate boom in Yanji City. Housing investment by Korean-Chinese is concentrated in the 'West' from Yanbian University, closely related to the city's urban planning that affects housing supply. This transnational housing consumption of immigrants connects the housing market of home and host country, in turn, causes the filtering process in the two countries simultaneously, which results the 'transnational housing filtering process'.

• Animal cells and systems
• /
• v.1 no.2
• /
• pp.329-335
• /
• 1997

The final pattern of the skeletal muscle of a vertebrate depends on the position-specific behavior of the muscle precursor cells during early developmental process and the abdominal muscle is made of cells which migrate a relatively long distance from their original tissue, myotome of dorsal mesoderm. We report the spatia-temporal migration pattern of abdominal muscle in Xenopus laevis by in situ hybridization and immunohistological studies. Shortly after hatching tadpole stage (stage 31/32), a group of myotomal cells detaches from the lower tip of the second somite and migrates ventrally to the lower position of abdomen. At stage 34/35, a second cell group migrates away from the third somite. Total 7 myotomal cell groups migrate ventrally one by one from the second to eighth myotome along their own pathways through the cell free space located between epidermis and subepidermal layer of the abdomen. During migration, the sizes of the cell groups (abdominal muscle anlagens) are increased to several tens fold. Around stage 40 all the abdominal muscle anlagens reaches their final positions and are interconnected side by side rostrocaudally. They are also connected to other types of muscles, forming a large multisegmented abdominal muscle. Heat shock study suggests that the disruption of segmentation of somites does not block the detachment of abdominal muscle anlagen, though the treatment gave stage- and dosagedependent effects on the migration speed.

• Journal of Agricultural Extension & Community Development
• /
• v.11 no.1
• /
• pp.83-93
• /
• 2004

This paper investigated the characteristics of population structure and the determinants of population movement in the south west area of Kyonggi-do by grouping 9 cities in 3 categories and using Panel data of $1995{\sim}2001$. The major findings of this paper were identified as follows : 1) The population structure of regions was different to the stages of urbanization. The ratio of child and elder dependency was high in the rural regions and low in the urbanized regions. It was due to the movement of economically active population of $20{\sim}40$ aged groups, from rural regions to urban regions. This means that more productive segments of the rural population leave the country to the city. In addition. The ratio of male to female was higher in $20{\sim}40$ aged groups for rural regions. This suggested that young females moved from rural regions to urban regions more than young males in the process of industrialization. 2) Based in pooling regression, income was the most significant determinant that could explain the inter-regional and intra-regional movement of population for south west area studied, The next one was educational opportunity variable. The coefficients of income and education were 0.5, 0,7 for intra-regional migration and 0.01, 0.02 for interregional migration indicating that Todaro's hypothesis could be tested well rather than Tiebout' model for this area.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.12 no.3
• /
• pp.1002-1015
• /
• 2018

The advent of Internet of Things (IoT) and the evident inadequacy of Cloud networks concerning management of numerous end nodes have brought about a shift of paradigm giving birth to Fog computing. Fog computing is an extension of Cloud computing that extends Cloud resources at the edge of the network, closer to the user. Cloud computing has become one of the essential needs of people over the Internet but with the emerging concept of IoT, traditional Clouds seem inadequate. IoT entails extremely low latency and for that, the Cloud servers that are distant and unknown to the user appear to be unsuitable. With the help of Fog computing, the Fog devices installed would be closer to the user that will provide an immediate storage for the frequently needed data. This paper discusses data migration between different storage types especially between Cloud devices and then presents a mechanism to migrate data between Cloud and Fog Layer. We call this mechanism Adaptive Deadline-Aware Scheme (ADAS) for Data migration between Cloud and Fog. We will demonstrate that we can access and process latency sensitive "hot" data through the proposed ADAS more efficiently than with a traditional Cloud setup.

• Elastomers and Composites
• /
• v.44 no.4
• /
• pp.397-400
• /
• 2009

Ozone caused the crack on the surface of a rubber article by oxidation of double bond at room temperature. Wax migrates to the surface of a rubber article and makes a physical barrier to prevent process of ozonation. We investigated change of molecular weight distribution of waxes in unfilled NR, SBR, and BR vulcanizates before and after aging at room temperature for 6 months. Migration and evaporation behaviors of wax in a rubber article at ambient conditions help understand a role of wax as an antidegradant and appearance contamination of a rubber article. The relative intensity distribution of n-alkanes of the NR specimen after the aging was shifted to higher molecular weight compared with the relative intensity distribution before the aging, while those of the SBR specimen before and after the aging did not show a big difference.

• Journal of the Korean association of regional geographers
• /
• v.14 no.2
• /
• pp.141-158
• /
• 2008

The goal of this paper is to analyze Korean migration to the Russian Far East(RFE) from the perspective of transnationalism. The analysis suggests that the Korean migrants could have constructed their transnational identities using the following practices: religious ritual, language uses, collective remittances, ethnic businesses, immigrant newspapers, and immigrant associations. In particular, the Korean migrants could have retained transnational interconnection between the places of origin and destination even without the process of globalization, which is regarded as an inevitable incentive to transnationalism in the literature. The Korean case indicates that the contextual changes in the sending and receiving countries, for instance, the establishment of a Japanese protectorate over Korea and the Russian Revolution, significantly facilitated the formation of transnational relationships among the Korean immigrants.

• Journal of Soil and Groundwater Environment
• /
• v.8 no.1
• /
• pp.35-41
• /
• 2003

Laboratory procedures are available for estimating contaminant migration from sediment into caps by diffusion, but diffusion may not be the major process affecting capping effectiveness. Movement of contaminated pore water from sediment into caps due to sediment consolidation during and after cap placement may be much more significant than contaminant diffusion into caps. To verify this phenomenon, model tests were conducted by utilizing a research centrifuge. In this study, test was modeled for 22.5 hours at 100 g, which modeled a contaminant migration time of 25 years for a prototype that was 100 times larger than the centrifuge model. Centrifuge test results illustrate that advection and dispersion due to consolidation are dominating the migration of contaminants.

• Bulletin of the Korean Chemical Society
• /
• v.10 no.1
• /
• pp.60-66
• /
• 1989

Semiempirical computations using the AM1 and MNDO methods were carried out in order to elucidate allowed mechanisms for 1,3-group(X) rearrangement processes with X = $BH_2$, $CH_3$, CN, F, $NH_2$, OH, Cl and SH. The reactivity of the group migration was largely controlled by the steric effect in the 4-membered ring transition state, an antarafacial process having a greater energy barrier due to a greater steric repulsion. For the groups with lone pair electrons, the participation of the lone pair orbital is found to ease the steric effect by enabling the FMO interation with highly polarizable, high lying, lone pair electrons at relatively distant range; the involvement of lone pairs in the transition state causes an alteration of the symmetry selection rule to that of a 6-electron system with an allowed 1,3-suprafacial migration in contrast to an allowed 1,3-antarafacial migration for a 4-electron system. Various stereoelectronic aspects were analysed in some detail.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2019.01a
• /
• pp.103-104
• /
• 2019

본 논문에서는 무선 센서 네트워크(Wireless Sensor Network, WSN) 환경에 배치되어 있는 각 센서들의 데이터 수집을 위한 싱크(Sink)가 일정 주기로 재배치되는 싱크 마이그레이션(Migration) 과정에서 센서 데이터를 종합하여 싱크로 전송하는 클러스터 헤드(Cluster Head, CH)의 자원 효율성 증대를 위해 중간 경로를 활용한 센서 할당 기법을 제안한다. 본 논문에서는 WSN 환경을 바탕으로 해당 기법을 적용하여 싱크 재배치 과정을 시뮬레이션 하였으며, 해당 실험의 결과에 따르면 클러스터 헤드의 자원 효율성 및 전체 센서 데이터의 수집률이 향상되었다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2019.01a
• /
• pp.105-106
• /
• 2019

본 논문에서는 무선 센서 네트워크(Wireless Sensor Network, WSN) 환경에 배치되어 물리적 데이터를 감지하는 각 센서들의 데이터를 수집을 위한 싱크(Sink)가 일정 주기로 이동 및 재배치되는 싱크 마이그레이션(Migration) 과정에 있어 다음 배치 위치를 효율적으로 선정하기 위해 클러스터 헤드(Cluster Head, CH)를 기준으로 영역 검색 단계를 추가하여 재배치 정확성 및 효율성 증대 기법을 제안한다. 본 논문에서는 WSN 환경을 바탕으로 싱크 재배치 과정에 해당 기법을 적용하여 시뮬레이션 하였으며, 해당 실험의 결과에 따르면 싱크 재배치의 정확성 및 효율성 증대로 전체 영역에 대한 고른 데이터 수집 및 소모 에너지 균형이 향상되었다.