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문찬미,임예슬 한국기초간호학회 2023 Journal of korean biological nursing science Vol.25 No.4
Purpose: This study conducted a concept analysis to clarify the meaning of anxiety in hospitalized patients with infectious diseases who have been placed in isolation. Methods: This study used Walker and Avant’s process of concept analysis. Results: Anxiety in hospitalized patients with infectious diseases who have been placed in isolation can be defined by the following attributes: 1) fear, 2) guilt, 3) isolation, 4) discrimination, 5) frustration, 6) shame, and 7) uncertainty. The antecedents of anxiety were as follows: 1) a lack of information about infectious diseases, 2) restrictions of movement, 3) blockage of the social support system, 4) helplessness, and 5) negative biases. The consequences of anxiety were 1) internalized stigma, 2) loss of confidence, 3) lack of social activities and avoidance, 4) insomnia, 5) poor quality of life. Conclusion: The definition and attributes of anxiety identified in this study can be applied to enhance the understanding of anxiety in hospitalized patients with infectious diseases who have been placed in isolation. Systematic suppose should also be provided to reduce anxiety in these patients.
A Review on Friction and Lubrication in Automotive Metal Forming: Experiment and Modeling
이기정,문찬미,이명규 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.6
Metal forming or shaping processes, such as sheet metal forming and bulk forming, are widely used in many industries including automotive industry. Before computational simulations were widely used in the field of metal forming industry, the trial-and-error based empirical approach was conventionally applied to the optimization of the metal forming process and product. The most commonly employed numerical approach in the metal forming process for robust process optimization is the finite element analysis. Friction, one of the parameters that significantly affect the accuracy of numerical analysis, depends on several variants such as surface quality, contact pressure, lubrication, deformation, and the forming environment. Despite the complexity and difficulty of identifying friction mechanisms, accurate friction models are essential and hence have been proposed by numerous researchers. In this paper, the friction models in the previous studies are reviewed by categorizing them into the boundary lubrication condition and mixed-boundary lubrication condition according to their evaluative influences on friction. Since friction models have been proposed based on the contact theories, an overview on the contact models is also included in this paper. In addition, the contribution of several parameters on the friction such as surface roughness and material properties of the tool, adhesion, contact pressure, sliding speed, bulk deformation is also discussed. This review paper aims to provide an understanding and insight into the friction modeling and simulation along with associated friction experiments.
성연우,문찬미,한상헌,김경택 한국산업경영시스템학회 2022 한국산업경영시스템학회 학술대회 Vol.2022 No.추계
Anomaly detection for each industrial machine is recognized as one of the essential techniques for machine condition monitoring and preventive maintenance. Anomaly detection of industrial machinery relies on various diagonal data from equipped sensors, such as temperature, pressure, electric current, vibration, and sound, to name a few. Among these data, sound data are easy to collect in the factory due to the relatively low installation cost of microphones to existing facilities. We develop a real time anomalous sound detection (ASD) system with the use of Autoencoder (AE) models in the industrial environments. The proposed processing pipeline makes use of the audio features extracted from the streaming audio signal captured by a single-channel microphone. The pipeline trains AE model by the collected normal sound. In real factory applications, the reconstruction error generated by the trained AE model with new input sound streaming is calculated to measure the degree of abnormality of the sound event. The sound is identified as anomalous if the reconstruction error exceeds the preset threshold. In our experiment on the CNC milling machining, the proposed system shows 0.9877 area under curve (AUC) score.
비이차 비등방 항복함수를 이용한 리튬-이온 배터리 파우치의 이방성 및 성형성 예측
김재승(J. S. Kim),문찬미(C. M. Moon),이형림(H.R. Lee),이명규(M. G. Lee) 한국소성·가공학회 2023 소성가공 : 한국소성가공학회지 Vol.32 No.3
This study analyzed the mechanical behavior of lithium-ion battery pouch material and predicted its formability. A homogenization method was used to evaluate the physical properties of the pouch, and a new hardening model was developed. The yield function for the plastic model was optimized, and the anisotropic property was determined. Also, the forming limits were measured and predicted using the M-K forming limit diagram. Finally, a square cup drawing experiment confirmed the accuracy of the measured mechanical properties and the formability calculation.
Biomedical Application of PHBV/Collagen (PHCP) Nanofiber as the Wound Dressing
Xu Zi Guang,문찬미,곽정식,오기완,배한익,한진이 충북대학교 동물의학연구소 2011 Journal of Biomedical and Translational Research Vol.12 No.3
In this study, a nanofibrous scaffold was obtained by co-electrospinning poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and collagen in 2,2,2-trifluoroethanol at a ratio of 3/7. The fiber diameters were in the range of 250-600 nm. It was found that PHBV/Collagen (PHCP) nanofibrous scaffold more proliferated than on the PHBV nanofibrous scaffold induced by oxidant in NIH3T3 cells. Otherwise, on the early-stage wound-healing mouse model, wound closure was evaluated by wound size reduction and histology of the regenerated skin on the back of mouse. An each of tissues removed on 0, 3, 6, 9, 12, 15 and 18 day were used to analyse biochemical and pathological changes. Every nanofiber-attached mice showed no significant difference to the 3th day, but from the third day until the nineth day, PHCP-attached mice were found to heal much faster than that of control wounds in epithelialisation, wound contraction and histopathological examinations. These results strongly support the beneficial effects of the biomedical application of PHCP nanofiber in the acceleration of wound healing initial phase through α-SM actin contraction.
Jungyun Won(원정윤),Chanmi Moon(문찬미),Sung-Woong Kim(김성웅),Myoung-Gyu Lee(이명규) 한국소성가공학회 2021 한국소성가공학회 학술대회 논문집 Vol.2021 No.5
In this study, mechanical properties and microstructure analyses on the corrosion resistance alloy (CRA) clad plate are conducted for the use of finite element modeling of JCOE piping process. The s teel plate consists of thick carbon steel and thin stainless steel as clad sheet. First, the basic plasticity properties of both constituent materials are measured using the standard mechanical testing, which can be modeled through conventional or advanced elastic-plasticity constitutive models. Then, as additional critical mechanical properties, the interfacial mechanical behavior at bonding surface between carbon steel and stainless steel is analyzed using a lab-scale T peel test and single lap shear test, which dominantly present the normal and tangential delamination at the interface. For the identification of the interface mechanical properties, a hybrid experimental-numerical approach adopting finite element simulations with the cohesive zone model is employed. Additionally, microstructure analysis base d on microscopy, EBSD etc. is also conducted to investigate the effect of microstructure near clad interface on the mechanical behavior of the clad plate.