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Book ; Online: Intermittency and Self-Organisation in Turbulence and Statistical Mechanics

Kim, Eun-jin

2019

Abstract: There is overwhelming evidence, from laboratory experiments, observations, and computational studies, that coherent structures can cause intermittent transport, dramatically enhancing transport. A proper description of this intermittent phenomenon, ... ...

Abstract	There is overwhelming evidence, from laboratory experiments, observations, and computational studies, that coherent structures can cause intermittent transport, dramatically enhancing transport. A proper description of this intermittent phenomenon, however, is extremely difficult, requiring a new non-perturbative theory, such as statistical description. Furthermore, multi-scale interactions are responsible for inevitably complex dynamics in strongly non-equilibrium systems, a proper understanding of which remains a main challenge in classical physics. As a remarkable consequence of multi-scale interaction, a quasi-equilibrium state (the so-called self-organisation) can however be maintained. This special issue aims to present different theories of statistical mechanics to understand this challenging multiscale problem in turbulence. The 14 contributions to this Special issue focus on the various aspects of intermittency, coherent structures, self-organisation, bifurcation and nonlocality. Given the ubiquity of turbulence, the contributions cover a broad range of systems covering laboratory fluids (channel flow, the Von Kármán flow), plasmas (magnetic fusion), laser cavity, wind turbine, air flow around a high-speed train, solar wind and industrial application
Keywords	Science (General) ; Mathematics
Size	1 electronic resource (298 pages)
Publisher	MDPI - Multidisciplinary Digital Publishing Institute
Document type	Book ; Online
Note	eng ; Open Access
HBZ-ID	HT020307424
ISBN	9783039211081 ; 9783039211098 ; 3039211080 ; 3039211099
Database	ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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Article ; Online: [Effects of a Health Partnership Program Using Mobile Health Application for Male Workers with Cardiovascular Risk Factors in Small and Medium Enterprises: A Randomized Controlled Trial].

Kim, Eun Jin / Hwang, Seon Young

Journal of Korean Academy of Nursing

2024 Volume 54, Issue 1, Page(s) 44–58

Abstract: Purpose: This study aimed to apply a health partnership program using commercially available mobile health apps to improve cardiovascular risk factors in male employees and verify its effectiveness.: Methods: Using a randomized control group pretest- ... ...

Abstract	Purpose: This study aimed to apply a health partnership program using commercially available mobile health apps to improve cardiovascular risk factors in male employees and verify its effectiveness. Methods: Using a randomized control group pretest-posttest design, male employees with cardiovascular risk factors from five small and medium-sized workplaces were randomly assigned to an experimental group (n = 32) and a control group (n = 31). The experimental group was encouraged to use three mobile health apps for 12 weeks to acquire the necessary cardiovascular disease-related information and practice strengthening training, walking, and diet management appropriate to their level. They also received feedback on their weekly activities and motivational text messages from health partners. Hypotheses were tested using the SPSS WIN 22.0. Results: The experimental group showed a significant difference compared to the control group in terms of their perception of mobile health app ( Conclusion: Intervention using mobile apps based on partnership with health managers is effective in improving the objective cardiovascular risk index in male employees; therefore, such intervention should be continuously used as a useful lifestyle modification strategy in the workplace.
MeSH term(s)	Humans ; Male ; Cardiovascular Diseases/prevention & control ; Mobile Applications ; Risk Factors ; Heart Disease Risk Factors ; Cholesterol, HDL ; Telemedicine
Chemical Substances	Cholesterol, HDL
Language	Korean
Publishing date	2024-03-14
Publishing country	Korea (South)
Document type	Randomized Controlled Trial ; English Abstract ; Journal Article
ZDB-ID	2619665-7
ISSN	2093-758X ; 2093-758X
ISSN (online)	2093-758X
ISSN	2093-758X
DOI	10.4040/jkan.23090
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Information Geometry, Fluctuations, Non-Equilibrium Thermodynamics, and Geodesics in Complex Systems.

Kim, Eun-Jin

Entropy (Basel, Switzerland)

2021 Volume 23, Issue 11

Abstract: Information theory provides an interdisciplinary method to understand important phenomena in many research fields ranging from astrophysical and laboratory fluids/plasmas to biological systems. In particular, information geometric theory enables us to ... ...

Abstract	Information theory provides an interdisciplinary method to understand important phenomena in many research fields ranging from astrophysical and laboratory fluids/plasmas to biological systems. In particular, information geometric theory enables us to envision the evolution of non-equilibrium processes in terms of a (dimensionless) distance by quantifying how information unfolds over time as a probability density function (PDF) evolves in time. Here, we discuss some recent developments in information geometric theory focusing on time-dependent
Language	English
Publishing date	2021-10-24
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2014734-X
ISSN	1099-4300 ; 1099-4300
ISSN (online)	1099-4300
ISSN	1099-4300
DOI	10.3390/e23111393
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Effects of Stochastic Noises on Limit-Cycle Oscillations and Power Losses in Fusion Plasmas and Information Geometry.

Hollerbach, Rainer / Kim, Eun-Jin

Entropy (Basel, Switzerland)

2023 Volume 25, Issue 4

Abstract: We investigate the effects of different stochastic noises on the dynamics of the edge-localised modes (ELMs) in magnetically confined fusion plasmas by using a time-dependent PDF method, path-dependent information geometry (information rate, information ... ...

Abstract	We investigate the effects of different stochastic noises on the dynamics of the edge-localised modes (ELMs) in magnetically confined fusion plasmas by using a time-dependent PDF method, path-dependent information geometry (information rate, information length), and entropy-related measures (entropy production, mutual information). The oscillation quenching occurs due to either stochastic particle or magnetic perturbations, although particle perturbation is more effective in this amplitude diminishment compared with magnetic perturbations. On the other hand, magnetic perturbations are more effective at altering the oscillation period; the stochastic noise acts to increase the frequency of explosive oscillations (large ELMs) while decreasing the frequency of more regular oscillations (small ELMs). These stochastic noises significantly reduce power and energy losses caused by ELMs and play a key role in reproducing the observed experimental scaling relation of the ELM power loss with the input power. Furthermore, the maximum power loss is closely linked to the maximum entropy production rate, involving irreversible energy dissipation in non-equilibrium. Notably, over one ELM cycle, the information rate appears to keep almost a constant value, indicative of a geodesic. The information rate is also shown to be useful for characterising the statistical properties of ELMs, such as distinguishing between explosive and regular oscillations and the regulation between the pressure gradient and magnetic fluctuations.
Language	English
Publishing date	2023-04-15
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2014734-X
ISSN	1099-4300 ; 1099-4300
ISSN (online)	1099-4300
ISSN	1099-4300
DOI	10.3390/e25040664
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Factors Affecting the Quality of Life in Low-Income Older Adults with Sarcopenia: A Cross-Sectional Study.

Nho, Ju-Hee / Kim, Eun Jin

Journal of Korean Academy of Nursing

2023 Volume 53, Issue 1, Page(s) 1–11

Abstract: Purpose: This study aimed to identify the factors influencing quality of life (QoL) of low-income older adults (LOAs) with sarcopenia.: Methods: A convenience sample of 125 older adults was recruited from Jeonbuk Province, South Korea. Data were ... ...

Abstract	Purpose: This study aimed to identify the factors influencing quality of life (QoL) of low-income older adults (LOAs) with sarcopenia. Methods: A convenience sample of 125 older adults was recruited from Jeonbuk Province, South Korea. Data were collected using a self-report questionnaire that included nutritional status, the Depression Anxiety Stress Scale-21, and the World Health Organization Quality of Life Instrument-Older Adults Module. Additionally, grip strength and appendicular skeletal muscle mass, were evaluated, along with the short physical performance battery. Results: Sarcopenia and severe sarcopenia were observed in 43.2% and 56.8% of participants, respectively. Using multiple regression analysis, depression (β = -.40, Conclusion: The results of this study can be used to develop a nursing intervention program and establish policies to improve depression, anxiety, and nutritional status to enhance QoL of LOAs with sarcopenia.
MeSH term(s)	Humans ; Aged ; Sarcopenia ; Cross-Sectional Studies ; Quality of Life ; Nutritional Status ; Hand Strength/physiology ; Muscle, Skeletal/physiology
Language	English
Publishing date	2023-03-08
Publishing country	Korea (South)
Document type	Journal Article
ZDB-ID	2619665-7
ISSN	2093-758X ; 2093-758X
ISSN (online)	2093-758X
ISSN	2093-758X
DOI	10.4040/jkan.22126
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: H-mode transition and pedestal studies.

Andrew, Yasmin / Kim, Eun-Jin

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

2023 Volume 381, Issue 2242, Page(s) 20210241

Abstract: The high confinement mode (H-mode) is the widely adopted standard operation scenario for the path to fusion in toroidal confinement devices. Since its discovery in 1982, the H-mode and access to the H-mode (the low to high and high to low transitions) ... ...

Abstract	The high confinement mode (H-mode) is the widely adopted standard operation scenario for the path to fusion in toroidal confinement devices. Since its discovery in 1982, the H-mode and access to the H-mode (the low to high and high to low transitions) remain two of the most actively researched areas in magnetically confined fusion programmes across the world. Significant progress has been made in the understanding of the intricate H-mode phase dynamics in recent years, from improvement in experimental diagnostic capability, theoretical development and modelling. The 'H-mode transition and pedestal studies' Special Issue provides a timely overview of recent progress in the study of H-modes covering experimental studies, further theoretical inquiry and computational modelling. This article is part of a discussion meeting issue 'H-mode transition and pedestal studies in fusion plasmas'.
Language	English
Publishing date	2023-01-02
Publishing country	England
Document type	Journal Article
ZDB-ID	208381-4
ISSN	1471-2962 ; 0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
ISSN (online)	1471-2962
ISSN	0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
DOI	10.1098/rsta.2021.0241
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Article ; Online: Stochastic Dynamics of Fusion Low-to-High Confinement Mode (L-H) Transition: Correlation and Causal Analyses Using Information Geometry.

Kim, Eun-Jin / Thiruthummal, Abhiram Anand

Entropy (Basel, Switzerland)

2023 Volume 26, Issue 1

Abstract: We investigate the stochastic dynamics of the prey-predator model of the Low-to-High confinement mode (L-H) transition in magnetically confined fusion plasmas. By considering stochastic noise in the turbulence and zonal flows as well as constant and time- ...

Abstract	We investigate the stochastic dynamics of the prey-predator model of the Low-to-High confinement mode (L-H) transition in magnetically confined fusion plasmas. By considering stochastic noise in the turbulence and zonal flows as well as constant and time-varying input power
Language	English
Publishing date	2023-12-22
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2014734-X
ISSN	1099-4300 ; 1099-4300
ISSN (online)	1099-4300
ISSN	1099-4300
DOI	10.3390/e26010017
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Nursing students' achievement emotions in association with clinical practicums and alternative learning.

Kim, Eun Jin / Roh, Young Sook

International journal of nursing education scholarship

2023 Volume 20, Issue 1

Abstract: Objectives: This study aimed to identify and compare nursing students' achievement emotions associated with clinical practicums and alternative learning during the COVID-19 pandemic.: Methods: This cross-sectional, descriptive study enrolled 236 ... ...

Abstract	Objectives: This study aimed to identify and compare nursing students' achievement emotions associated with clinical practicums and alternative learning during the COVID-19 pandemic. Methods: This cross-sectional, descriptive study enrolled 236 nursing students. Participants completed a web-based, self-administered survey regarding achievement emotions. Wilcoxon signed-rank tests were used to calculate mean differences in achievement emotions associated with clinical practicums and alternative learning. Results: Nursing students who undertook e-learning reported higher negative achievement emotions than those who experienced other alternative learning modalities. Higher achievement emotions were associated with clinical practicums than with alternative learning. The most frequently reported negative emotions were anxiety associated with clinical practicums and boredom with alternative learning. Conclusions: Nurse educators should design and implement supportive clinical learning experiences to engender productive achievement emotions. Implications for an international audience: Nurse educators should play roles in providing well-designed and supportive clinical learning environments to help nursing students regulate achievement emotions.
MeSH term(s)	Humans ; Students, Nursing/psychology ; Preceptorship ; Cross-Sectional Studies ; Pandemics ; COVID-19/epidemiology ; Emotions ; Education, Nursing, Baccalaureate
Language	English
Publishing date	2023-01-24
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2162109-3
ISSN	1548-923X ; 2194-5772
ISSN (online)	1548-923X
ISSN	2194-5772
DOI	10.1515/ijnes-2022-0062
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: A new synergistic model for simulating exercise incorporating control mechanisms at cellular and organ scales.

Pearce, Nicholas F / Kim, Eun-Jin

Computers in biology and medicine

2023 Volume 163, Page(s) 107141

Abstract: The physiological response of the cardio-vascular system (CVS) to physical activity is of great importance to those working in sporting research and has profound consequences for the health and well-being of people. Coronary vasodilation and the ... ...

Abstract	The physiological response of the cardio-vascular system (CVS) to physical activity is of great importance to those working in sporting research and has profound consequences for the health and well-being of people. Coronary vasodilation and the physiological mechanisms involved in exercise have frequently been the focus of numerical models for simulating exercise. This is partly achieved using the time-varying-elastance (TVE) theory, which prescribes the pressure-volume relationship of the ventricle as a periodic function of time, tuned using empirical data. The empirical foundations of the TVE method however, and its suitability for CVS modelling are frequently questioned. To overcome this challenge, we adopt a different synergistic approach in which a model for the microscale heart muscle (myofibers) activity is embedded within a macro organ-scale CVS model. We developed such a synergistic model by including the coronary flow and various control mechanisms at the circulation level through feedback and feedforward means, and at the microscale (contractile) through the regulation of ATP availability and myofiber force depending on exercise intensity or heart rate. The coronary flow produced by the model displays the well-known 2-phase character of the flow, which is preserved under exercise. The model is tested by simulating reactive hyperemia, which is a transient occlusion of the coronary flow, successfully reproducing the additional coronary flow following the block removal. On-transient exercise results reveal a rise in both cardiac output and mean ventricle pressure as expected. The stroke volume increases initially, but then declines during the latter period of HR rise, corresponding with one of the main physiological responses to exercise. The pressure-volume loop expands during exercise, as systolic pressure rises. The Myocardial oxygen demand increases during exercise and the coronary blood supply increases in response, causing an excess of oxygen supply to the heart. Off-transient exercise recovery is largely a reverse of this response, although the behaviour is slightly more varied, with sudden spikes in coronary resistance. Different levels of fitness and exercise intensity are tested and reveal that the stroke volume rises until a level of myocardial oxygen demand is reached at which point it declines. This level of demand is independent of fitness or exercise intensity. An advantage of our model is demonstrated in the correspondence between the micro and organ scale mechanics so that cellular pathologies can be traced from exercise performance with relatively little computational or experimental expense.
MeSH term(s)	Humans ; Coronary Circulation/physiology ; Exercise ; Myocardium ; Blood Pressure ; Oxygen
Chemical Substances	Oxygen (S88TT14065)
Language	English
Publishing date	2023-06-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	127557-4
ISSN	1879-0534 ; 0010-4825
ISSN (online)	1879-0534
ISSN	0010-4825
DOI	10.1016/j.compbiomed.2023.107141
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Information Geometry Theoretic Measures for Characterizing Neural Information Processing from Simulated EEG Signals.

Hua, Jia-Chen / Kim, Eun-Jin / He, Fei

Entropy (Basel, Switzerland)

2024 Volume 26, Issue 3

Abstract: In this work, we explore information geometry theoretic measures for characterizing neural information processing from EEG signals simulated by stochastic nonlinear coupled oscillator models for both healthy subjects and Alzheimer's disease (AD) patients ...

Abstract	In this work, we explore information geometry theoretic measures for characterizing neural information processing from EEG signals simulated by stochastic nonlinear coupled oscillator models for both healthy subjects and Alzheimer's disease (AD) patients with both eyes-closed and eyes-open conditions. In particular, we employ information rates to quantify the time evolution of probability density functions of simulated EEG signals, and employ causal information rates to quantify one signal's instantaneous influence on another signal's information rate. These two measures help us find significant and interesting distinctions between healthy subjects and AD patients when they open or close their eyes. These distinctions may be further related to differences in neural information processing activities of the corresponding brain regions, and to differences in connectivities among these brain regions. Our results show that information rate and causal information rate are superior to their more traditional or established information-theoretic counterparts, i.e., differential entropy and transfer entropy, respectively. Since these novel, information geometry theoretic measures can be applied to experimental EEG signals in a model-free manner, and they are capable of quantifying non-stationary time-varying effects, nonlinearity, and non-Gaussian stochasticity presented in real-world EEG signals, we believe that they can form an important and powerful tool-set for both understanding neural information processing in the brain and the diagnosis of neurological disorders, such as Alzheimer's disease as presented in this work.
Language	English
Publishing date	2024-02-28
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2014734-X
ISSN	1099-4300 ; 1099-4300
ISSN (online)	1099-4300
ISSN	1099-4300
DOI	10.3390/e26030213
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