ScholarWorks@Sookmyung Women's University
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http://scholarworks.sookmyung.ac.kr:80
2024-03-15T03:51:35Z
2024-03-15T03:51:35Z
DewMetrics: Demystification of the Dew Computing in Sustainable Internet of Things
Roy, S.
Panda, D.
Kim, B.-G.
Bairagi, P.
Mondal, T.
Arosh, S.
Sinha, S.
De, D.
Wang, Y.
Skala, K.
Davidovic, D.
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159613
2024-01-30T02:00:19Z
2024-09-01T00:00:00Z
Title: DewMetrics: Demystification of the Dew Computing in Sustainable Internet of Things
Authors: Roy, S.; Panda, D.; Kim, B.-G.; Bairagi, P.; Mondal, T.; Arosh, S.; Sinha, S.; De, D.; Wang, Y.; Skala, K.; Davidovic, D.
Abstract: Dew computing, a new version of the computing paradigm appeared along with cloud, edge, and fog computing. Dew computing is a distributed computing framework that is deliberated as an augmentation in the cloud computing schema. Researchers and academic practitioners have explored the concept of dew computing since its germination. In dew computing, users can perform full system functionality without depending on Internet availability. Information will be warehoused on the local storage of the user’s device, and when the Internet connection is present, harmonization will be accomplished to synchronize the transmitted information on cloud-dependent applications. There have been voluminous implementations of dew computing in prevailing usages, although research achieved concerning dew computing is not as much as in erstwhile distributed computing spheres. They have even tried to integrate computing into several existing and sustainable applications, such as the Internet of Things, smart Healthcare, Indoor navigation, agriculture, and numerous human-centric paradigms. The key objective of dew computing is to enhance the efficiency and reduce the cost of personal IoT devices which further augment the productivity and scalability of any distributed computing network. In this chapter, we first briefly focus on unfolding the concept of dew computing. We illustrate a set of real-time case studies, such as the cache computing framework for dew devices, the reduced Internet dependency-induced decision-making processes, the crises, the humanitarian Internet of Music Things, and so on, where the flow of information should be abundant despite having issues with constant digital network connectivity. We would focus on providing a detailed literature survey of dew computing architecture, applications, tools, and technologies that might assist in delivering ICT-based sustainable Internet of Things applications. This chapter additionally provides a deep insight into upcoming tools and technologies that can be integrated with the conventional dew computing architecture for obtaining more efficiency in Internet-dependent distributed networks.
2024-09-01T00:00:00Z
A Time-Based Direct MPPT Technique for Low-Power Photovoltaic Energy Harvesting
Maeng, J.
Jeong, J.
Park, I.
Shim, M.
Kim, C.
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159596
2024-01-29T03:00:26Z
2024-05-01T00:00:00Z
Title: A Time-Based Direct MPPT Technique for Low-Power Photovoltaic Energy Harvesting
Authors: Maeng, J.; Jeong, J.; Park, I.; Shim, M.; Kim, C.
Abstract: This letter introduces a maximum power point tracking (MPPT) technique for photovoltaic (PV) energy harvesting (EH) systems to enhance the end-to-end efficiency (ηE-E) when the output power of PV cell (PPV,MAX) is low. A ripple-based PV cell current sensing and a time domain multiplication are proposed to monitor the PV cell power delivered to the charger, which reduces the controller power consumption (PCTR). The PV EH system with the proposed MPPT method is implemented in a 180-nm CMOS process. The PCTR is 1.34 μW. The measured ηE-E at low PPV,MAX (13 μW) is 88%. The measured peak ηE-E is 94.4% at 82 μW. IEEE
2024-05-01T00:00:00Z
Endothelial periostin regulates vascular remodeling by promoting endothelial dysfunction in pulmonary arterial hypertension
Lee, Dawn
Lee, Heeyoung
Jo, Ha-neul
Yun, Eunsik
Kwon, Byung Su
Kim, Jongmin
Lee, Aram
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159610
2024-01-29T08:00:25Z
2024-02-01T00:00:00Z
Title: Endothelial periostin regulates vascular remodeling by promoting endothelial dysfunction in pulmonary arterial hypertension
Authors: Lee, Dawn; Lee, Heeyoung; Jo, Ha-neul; Yun, Eunsik; Kwon, Byung Su; Kim, Jongmin; Lee, Aram
Abstract: Pulmonary arterial hypertension (PAH) is characterized by vascular remodeling associated with extracellular matrix (ECM) deposition, vascular cell hyperproliferation, and neointima formation in the small pulmonary artery. Endothelial dysfunction is considered a key feature in the initiation of vascular remodeling. Although vasodilators have been used for the treatment of PAH, it remains a life-threatening disease. Therefore, it is necessary to identify novel therapeutic targets for PAH treatment. Periostin (POSTN) is a secretory ECM protein involved in physiological and pathological processes, such as tissue remodeling, cell adhesion, migration, and proliferation. Although POSTN has been proposed as a potential target for PAH treatment, its role in endothelial cells has not been fully elucidated. Here, we demonstrated that POSTN upregulation correlates with PAH by analyzing a public microarray conducted on the lung tissues of patients with PAH and biological experimental results from in vivo and in vitro models. Moreover, POSTN overexpression leads to ECM deposition and endothelial abnormalities such as migration. We found that PAH-associated endothelial dysfunction is mediated at least in part by the interaction between POSTN and integrin-linked protein kinase (ILK), followed by activation of nuclear factor-kappa B signaling. Silencing POSTN or ILK decreases PAH-related stimuli-induced ECM accumulation and attenuates endothelial abnormalities. In conclusion, our study suggests that POSTN serves as a critical regulator of PAH by regulating vascular remodeling, and targeting its role as a potential therapeutic strategy for PAH.
2024-02-01T00:00:00Z
Assessing carbon neutrality pathways: Prerequisites and mitigation potential of power-to-X in the chemical sector of South Korea
Jang, M.
Hong, J.
Yoo, S.
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151543
2023-12-19T03:01:40Z
2024-01-01T00:00:00Z
Title: Assessing carbon neutrality pathways: Prerequisites and mitigation potential of power-to-X in the chemical sector of South Korea
Authors: Jang, M.; Hong, J.; Yoo, S.
Abstract: Achieving carbon neutrality without innovative mitigation measures can be challenging. Power-to-X (P2X), a technology for capturing and utilizing carbon, has become an emerging solution for offsetting CO2 emissions. However, the mitigation potential of P2X is dependent on various factors, and P2X cannot perform a mitigation role with the national electric grid in our scenario analysis. This study aims to examine the requirements for P2X to achieve carbon neutrality. We establish a mathematical mechanism to assess the mitigation potential of P2X and examine the role of various factors in reducing GHG emissions. We found that energy share in electricity production decides the pace of emission reduction; the cleaner the energy share, the faster the emissions reach the inflection point of the mitigation pathways. Adoption rate also plays a key role to amplify inclination of emission paths. As a result, P2X could immensely reduce CO2 emissions regardless of adoption rates, if the clean energy share is above 80% without coal. The relationship between these factors and mitigation potential of P2X concludes that this emerging technology is a double-edged sword and requires meticulous planning for its adoption. © 2023
2024-01-01T00:00:00Z