• Journal of the Korean association of regional geographers
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• v.19 no.4
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• pp.668-682
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• 2013

This study illustrates the mechanism of The Decrease of Korean population in Yanbian Korean Autonomous Prefecture (YBKAP) and some changes of regional characteristics since China's economic reforming. Due to China's Implementing market economic system, deregulating in family register system, higher mobility since establishing Sino-Korean diplomatic relations, the expansion of intermarriages and residential areas, Korean community is confronted with lower birthrate and continuous mobility of the young and women. It directly connects to a decrease in urban population and aging, causing a decline in farming production, disintegrating of Korean community, weakening the function of villagers' organization, shrinking in Korean education and leaderships. For supplementing the shorted labor, Chinese farmers from other areas flow into the YBKAP, showing some different trends, such as farming Chinesization, Chinese farmers' higher economic level than Korean, the Korean traditional paddy field transforming into dry farmland with single-crop farming and pursuing commercial production in labor management. At the moment, declining population in Korean community in rural areas means that the community could not respond the changes of farming environments appropriately and in some way it is facing with the crisis of die away from the Chinese society. It needs an unconventional support and development policies in YBKAP rural areas.

• Research in Community and Public Health Nursing
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• v.15 no.1
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• pp.18-28
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• 2004

Purpose: The purpose of the study was to analyze the changes in functional status and caregiver burden after a community based case management program for stroke patients. Method: This study was designed as a one group pre and post test. A total of 61 stroke patients and their caregivers were sampled in three urban areas and two rural areas. Face to face interviews were conducted as a pre test one week before intervention, and a post test two weeks after intervention. The case management program consisted of four home visits and two telephone counseling sessions for assessment, education and providing information during the eight weeks. The collected data were analyzed with paired t test. Results: First, significant differences in functional status, and specifically mobility and cognition, were found between pre test and post test. Second, caregiver burden, in particular, objective burden was significantly decreased after 8 weeks. Third, the positive response for the services increased after 8 weeks. Conclusion: The community based case management program was effective to improve the functional status of stroke patients and to decrease the caregiver burden.

• Journal of the Korean Dietetic Association
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• v.25 no.4
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• pp.295-309
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• 2019

The purpose of this study were to identify the dietary practices of vulnerable older adults and to assess the foodservice and food provision service programs perceived by the health and welfare service providers in the community. A survey was conducted on health and welfare service providers working in outreach community centers and community health centers in Seoul. A total of 260 nurses and social workers participated in the survey and 224 responses were used for data analysis after excluding significant missing data. The respondents consisted of nurses (58.5%) and social workers (41.5%). In terms of the dietary life of the vulnerable older adults, they perceived that the food cost was burdensome to the older adults and poor dental conditions prohibited them from eating various foods. The health and welfare service providers rated highly for 'home-delivered meal and side dish services are effective for checking older adults' conditions' but rated low for availability of menu choices. In targeting vulnerable older adults for food and nutrition service programs, the home-delivered meal service was found to be suitable for older adults living alone, those over age of 80 years, those with mobility difficulties, and those with economic difficulties. The food provision service was appropriate for older adults living with their spouse or other family members. Vulnerable older adults are a heterogeneous population with diverse needs related to food and nutrition. Home-delivered meal/side dish service and food provision services will achieve their goals when they reach the correct targets with a customized service.

• 한국사회정책
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• v.24 no.1
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• pp.187-211
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• 2017

This study aimed to examine the relationship between children's perceived levels of neglect and abuse and community characteristics. For this, it analyzed data from the Korean Children & Youth Panel Survey and data collected from the Statistics Korea. Main findings are as follows. First, children who resided in the communities with higher report rates of child maltreatment perceived higher levels of neglect. Second, children who resided in the communities with higher rates of welfare recipients, lower residential mobility, or lower rates of those who responded they had someone to ask for help when they were sick tended to perceive higher levels of neglect. Third, while the perceived levels of abuse were explained by the child factors, those of neglect were explained by child, family, and community factors. Based on these findings, this study suggested the interventions on the community levels and future research directions.

• Journal of Ecology and Environment
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• v.48 no.1
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• pp.32-48
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• 2024

Background: Longitudinal connectivity in river systems strongly affects biological components related to ecosystem functioning, thereby playing an important role in shaping local biodiversity and ecosystem health. Environmental DNA (eDNA)-based metabarcoding has an advantage of enabling to sensitively diagnose the presence/absence of species, becoming an efficient/effective approach for studying the community structure of ecosystems. However, little attention has been paid to eDNA-based biomonitoring for river systems, particularly for assessing the river longitudinal connectivity. In this study, by using eDNA we analyzed and compared species diversity and composition among artificial barriers to assess the longitudinal connectivity of the fish community along down-, mid- and upstream in the Hotancheon from the Geum River basin. Moreover, we investigated temporal variation in eDNA fish community structure and species diversity according to season. Results: The results of species detected between eDNA and conventional surveys revealed higher sensitivity for eDNA and 61% of species (23/38) detected in both methods. The results showed that eDNA-based fish community structure differs from down-, mid- and upstream, and species diversity decreased from down to upstream regardless of season. We found that there was generally higher species diversity at the study sites in spring (a total number of species across the sites [n] = 29) than in autumn (n = 27). Nonmetric multidimensional scaling and heatmap analyses further suggest that there was a tendency for community clusters to form in the down-, mid- and upstream, and seasonal variation in the community structure also existed for the sites. Dominant species in the Hotancheon was Rhynchocypris oxycephalus (26.07%) regardless of season, and subdominant species was Nipponocypris koreanus (16.50%) in spring and Odontobutis platycephala (15.73%) in autumn. Artificial barriers appeared to negatively affect the connectivity of some fish species of high mobility. Conclusions: This study attempts to establish a biological monitoring system by highlighting the versatility and power of eDNA metabarcoding in monitoring native fish community and further evaluating the longitudinal connectivity of river ecosystems. The results of this study suggest that eDNA can be applied to identify fish community structure and species diversity in river systems, although some shortcomings remain still need to be resolved.

• Korean Institute of Interior Design Journal
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• v.20 no.6
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• pp.135-144
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• 2011

This study starts from the question if the characteristic of existing conventional site-specificity can be applied to the modern city space in information media era as it is. The evolution and spread of media technology acted as the catalyst which establishes the identity of an individual and promotes the social sense of belonging as the new type of community member as well as expanded the communication territory of man. Moreover, as the perfect merge of third dimensional space with second dimensional media was accomplished, the meaning of city as the place is getting changed and extended to city space as the information platform which integrates and intermediates the various information composing city. Hereupon, this study is willing to analyze the limits which the characteristics of physical, active and meaningful elements which are the forming primary factors in the existing place theory have and establish the new meaning of city as the place through the case studies which are applied by the characteristics of hyper spacio-temporal, mobility and polysemy as the characteristics transformed by information platformization of city space.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.5
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• pp.959-975
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• 2011

Wireless mesh networks enlarge the wireless coverage area by interconnecting relatively stationary wireless routers (mesh routers). As wireless mesh networks are envisioned to provide high-bandwidth broadband Internet service to a large community of users, the Internet gateway, which acts as a central point of Internet attachment for the mesh networks, is likely to suffer heavily from the scramble for shared wireless resources because of aggregated traffic toward the Internet. It causes performance decrement on end-to-end transmissions. We propose a scheme to balance the load in a mesh network based on link quality variation to different Internet gateways. Moreover, under the mesh coverage, mobile nodes can move around and connect to nearby mesh routers while still keeping the connections to the Internet through the best gateway in terms of link quality. In this structure, gateways perform the balancing procedure through wired links. Information about gateways and mobile node's location is distributed appropriately so that every mesh router can quickly recognize the best gateway as well as the positions of mobile nodes. This distributed information assists mobile nodes to perform fast handoff. Significant benefits are shown by the performance analysis.

• Journal of Communications and Networks
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• v.10 no.4
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• pp.422-429
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• 2008

Mobile peer-to-peer (P2P) systems have recently got in the limelight of the research community that is striving to build efficient and effective mobile content addressable networks. Along this line of research, we propose a new peer-to-peer file sharing protocol suited to mobile ad hoc networks (MANET). The main ingredients of our protocol are network coding and mobility assisted data propagation, i.e., single-hop communication. We argue that network coding in combination with single-hop communication allows P2P file sharing systems in MANET to operate in a more efficient manner and helps the systems to deal with typical MANET issues such as dynamic topology and intermittent connectivity as well as various other issues that have been disregarded in previous MANET P2P researches such as addressing, node/user density, non-cooperativeness, and unreliable channel. Via simulation, we show that our P2P protocol based on network coding and single-hop communication allows shorter file downloading delays compared to an existing MANET P2P protocol.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.34 no.5
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• pp.348-356
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• 2021

Field-effect transistors (FETs) are the key elements of conventional electronics; hence, have drawn a lot of research and commercial interests. In recent years, metal halide perovskite materials have achieved a remarkable efficiency of 29.15% in the field of photovoltaics, and have drawn the scientific community's attention to promote their use in the field of optoelectronics, such as FETs and phototransistors. The MAPbI₃ (methylammonium lead iodide) perovskite TFT has achieved a record hole mobility of 21.41 cm²/V-s in the year 2020. In this review, we will briefly discuss the physical structure of MAPbI₃ perovskite and the essential factors that stimulate these devices, together with the role of defects, the ion migration concept, and the implication of both dielectric and electrode materials on the device's performance.

• Journal of Advanced Navigation Technology
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• v.24 no.5
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• pp.329-342
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• 2020

In this paper, we analyzed the requirements for the application of UAM, a new concept to solve the traffic congestion in large cities. First, the current domestic and foreign status of research and development related to UAM was investigated and the pros and cons and the time required for each mission radius were analyzed for various configurations of aircraft being commercialized. In addition, in order to analyze the market acceptance of the UAM, the individual's consciousness and reliability requirements were identified and safety requirements were analyzed through accident rate data for each aircraft type. Because it operates in a densely populated urban area, requirement analyses on noise and exhaust, which are environmental factors that can affect the community were performed, and requirements related to aircraft performance, certification standards, and airworthiness standards of FAA and EASA were also analyzed.