웜홀 라우팅 방식의 상호연결망을 위한 실시간 흐름제어 정책

학위논문(박사) - 한국과학기술원 : 전산학과, 1998.8, [ xi, 95 p. ]Multicomputers and scalable clusters of low-end PCs/workstations have been expected as the most promising vehicle for high-performance computing. Whereas high-performance power in the past was dedicated for large-scale computation intensive applications, recent high-performance computing from multicomputers and scalable clusters has been exploited for a broad range of new service such as multimedia processing, data mining, and industrial process control. Unlike traditional supercomputing applications which desire a better system performance in an average sense, the new service requires another performance criteria in terms of quality of service(QoS). With QoS being a different definition for each application, we in this thesis focus on timing correctness which requires logically correct results to be generated within a specified deadline for real-time application with delay sensitive traffic such as multimedia service, automated manufacturing, and industrial process control. Since the overall performance of multicomputers and scalable clusters critically depends on the performance of their interconnect networks, efforts are made in this thesis to make their interconnect networks to satisfy the new criteria. Most of recent interconnect networks have employed a wormhole routing technique, since it makes the message latency insensitive to the distance travelled by a message and it can be implemented by a small, high-speed router with a current VLSI technology. Wormhole-routed networks can be characterized by its blocking flow control in which a packet to fail to acquire a desired channel is just stopped in place. Assuming a priority-driven paradigm where a different level of delay requirement of a real-time message is represented into an appropriate priority, the blocking flow control may directly lead to a priority inversion problem in the sense that high priority packets are blocked by low priority packets for unlimited time. The priority inversion causes the fr...한국과학기술원 : 전산학과

A compile-time wormhole routing in mesh-connected multicomputers exploiting communication characteristics of applications

학위논문(석사) - 한국과학기술원 : 전산학과, 1994.2, [ iii, 47 p. ]한국과학기술원 : 전산학과

Impact of COVID-19-related concerns and depression on handwashing practice among community-dwelling older adults: a secondary analysis of the 2020 Korea Community Health Survey

Purpose: This study investigated hand-washing practice among community-dwelling older adults during the coronavirus disease 2019 (COVID-19) pandemic and aimed to identify the impact of COVID-19-related concerns and depression on hand-washing practice. Methods: This was a secondary analysis of data extracted from the 2020 Community Health Survey. The primary data were collected through self-reporting from August 10 to September 8, 2020 in a cross-sectional study. The subjects comprised of 1,350 adults aged 65 or older living in Jeju Province who participated in the 2020 Community Health Survey. Results: The factors affecting hand-washing practice among older adults were male older adults (β = -.18, p < .001), age (β = -.07, p = .001), no education (β = -.20, p < .001) and elementary, middle, and high school graduation (β = -.15, p < .001) compared to a college or higher education, poor health perception (β = -.13, p < .001), COVID-19-related concerns (β = .08, p = .005), and depression (β = -.07, p = .001). To summarize, the factors negatively affecting hand-washing practice included male gender, lower education level, poor health perception, and depression. In contrast, factors positively associated with hand-washing practice included COVID-19-related concerns. Conclusion: These findings show the importance of considering these multifaceted determinants when designing targeted interventions and educational programs to promote hand-washing among older adults. Additionally, based on the relationship between hand-washing practice and COVID-19-related concerns and depression, interventions that can alleviate mental problems along with providing proper education are required