• Journal of the Korean Society for Nondestructive Testing
• /
• v.27 no.6
• /
• pp.563-575
• /
• 2007

This contribution contained the classical work of an open-hole tensile plate to demonstrate the performance of grating shearography and to compare with the results obtained by other full-field measurement techniques, The isotropic plate with an open-hole has often appeared in the previous contributions introducing novel full-field method and system. Grating shearography directly provided six quantitative measurands about the specimen's surface kinematics by using a single measurement set: three in-plane strains, in plane rotation, and two out-of-plane slopes. The quasi-plane wavefront of grating metrology led to high signal-to-noise ratio (SNR) and thus neither fitting nor filtering was applied, and the small shearing distance of $101{\mu}m$ could be used. The small shearing distance provided the outstanding spatial resolution of $80{\mu}m$ and sensitivity appropriate for experimental mechanics. Finally, the grating shearography enabled the visualization of the complex surface deformation around the hole and also detected parasitic flexions of the specimen in the micrometer regime during the tensile test.

• Archives of Pharmacal Research
• /
• v.26 no.9
• /
• pp.697-705
• /
• 2003

The alkylphenols, chlorophenols, and bisphenol A were determined by gas chromatography/mass spectrometry-selected ion monitoring (GC/MS-SIM) followed by two work-up methods for comparison: isobutoxycarbonyl (isoBOC) derivatization and tert-butyldimethylsilyl (TBDMS) derivatization. Eleven endocrine disrupting chemicals (EDCs) of phenols in biological samples were extracted with acetonitrile and then the acetonitrile layer underwent freezing filtration 6$0^{\circ}C$ for 2 hours. Solid-phase extraction (SPE) was used with XAD-4 and subsequent conversion to isoBOC or TBDMS derivatives for sensitivity analysis with the GC/MS-SIM mode. For isoBOC derivatization and TBDMS derivatization the recoveries were 92.3∼150.6% and 93.8∼108.3%, the method detection limits (MDLs) of bisphenol A for SIM were 0.062 $\mu$ g/kg and 0.010 $\mu$ g/kg, and the SIM responses were linear with the correlation coefficient varying by 0.9755∼0.9981 and 0.9908∼0.9996, respectively. When these methods were applied to mackerel samples, the concentrations of the 11 phenol EDCs were below the MDL.

• Journal of muscle and joint health
• /
• v.28 no.3
• /
• pp.242-251
• /
• 2021

Purpose: The aim of this study was to examine the relationship between calling, clinical performance, role conflict, and organizational socialization and to evaluate the factors associated with organizational socialization of new nurses. Methods: This study design was cross-sectional correlational study. The participants of this study were new nurses 171 at general hospitals in Jeollabuk-do. Data was collected between August 1 to 20, 2018 from questionnaire responses and were analyzed with descriptive statistics, independent t-test, one-way ANOVA, pearson's correlation coefficient, and multiple regression analysis. Results: The average calling rating was 2.47±0.59 (rated on a scale of 1~4), clinical performance rating was 3.55±0.52 (rated on a scale of 1~5), role conflict rating was 3.29±0.59 (rated on a scale of 1~5), and organizational socialization rating 3.19±0.41 (rated on a scale of 1~5). Calling, clinical performance, role conflict, gender, and work in the desired unit were the significant factors influencing organizational socialization of new nurses. Conclusion: These findings indicate that strategies are needed to improve organizational socialization of new nurses to ensure effective management of personnel. Moreover, it is necessary to develop a program to cultivate the nursing calling, enhance clinical performance, and resolve role conflicts among new nurses.

• Journal of Yeungnam Medical Science
• /
• v.36 no.2
• /
• pp.78-84
• /
• 2019

Medical education research subjects are incredibly diverse and have changed over time. This work in particular aims to compare and analyze research trends in medical education through the words used in the titles of these research papers. Academic Medicine (the journal of the Association of American Medical Colleges), Medical Teacher (the journal of the Association of Medical Education in Europe), the Korean Journal of Medical Education (KJME), and Korean Medical Education Review (KMER) were selected and analyzed for the purposes of this research. From 2009 to 2018, Academic Medicine and Medical Teacher published approximately 10 to 20 times more papers than the KJME and KMER. Frequently used words in these titles include "medical," "student," "education," and "learning." The words "clinical" and "learning" were used relatively often (7.80% to 13.66%) in Korean journals and Medical Teacher, but Academic Medicine used these phrases relatively less often (6.47% and 4.41%, respectively). Concern with such various topics as problem-based learning, team-based learning, program evaluations, burnout, e-learning, and digital indicates that Medical Teacher seems to primarily deal with teaching and learning methodologies, and Academic Medicine handles all aspects of medical education. The KJME and KMER did not cover all subjects, as they publish smaller papers. However, it is anticipated that research on new subjects, such as artificial intelligence in medical education, will occur in the near future.

• The Korean Journal of Health Service Management
• /
• v.12 no.3
• /
• pp.63-78
• /
• 2018

Objectives: To construct a structural equation model to explain and predict nursing performance in advanced beginner-stage nurses. Methods: This study was conducted from September 1 to October 10, 2017. Participants in this study were 220 nurses recruited from general hospitals with over 300 beds in P and K cities. Confirmatory factor and path analyses were conducted using AMOS 18.0. Results: Nursing performance was affected by self-leadership and self-efficacy; self-efficacy (${\beta}=.794$, p=.025) had a greater effect. Problem-solving competency was affected byself-leadership and self-efficacy ;self-efficacy(${\beta}=.712$, p=.016) had a greater effect. Self-leadership was affected byself-efficacy(${\beta}=.820$, p=.013). Conclusion: Based on the results of this study, it is recommended that a new program be developed and applied to improve advanced beginner-stage nurses' self-leadership and self-efficacy to enhance nursing performance.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.26 no.3
• /
• pp.176-182
• /
• 2021

This research proposes a high-frequency circuit that can accurately predict the differential mode noise of single-phase inverters at the circuit design stage. Proposed single-phase inverter high frequency circuit in the work is a form in which harmonic impedance components are added to the basic single-phase inverter circuit configuration. For accurate noise prediction, parasitic components present in each part of the differential noise path were extracted. Impedance was extracted using a network analyzer and Q3D in the measurement range of 150 kHz to 30 MHz. A high-frequency circuit model was completed by applying the measured values. Simulations and experiments were conducted to confirm the validity of the high-frequency circuit. As a result, we were able to predict the resonance point of the differential mode voltage extracted as an experimental value with a high-frequency circuit model within an approximately 10% error. Through this outcome, we could verify that differential mode noise can be accurately predicted using the proposed model of the high-frequency circuit without a separate test bench for noise measurement.

• Journal of Plant Biotechnology
• /
• v.48 no.1
• /
• pp.44-53
• /
• 2021

The present work aims to study the induction of somatic embryogenesis in cork oak (Quercus suber L.) from immature zygotic embryos and young apical leaves obtained from 2-month-old seedlings through acorn germination on sterilized peat. The immature zygotic embryos were grown for 1 month on the mineral solution of MS in the presence of 4.52 µM 2,4-D and 30 g/L sucrose. They were then transferred to the same mineral solution with no added growth regulators. In the third subculture, yellow somatic embryos, characterized by two voluminous cotyledons, were differentiated from the radicle of the immature zygotic embryos. The induction of somatic embryogenesis in young leaves required a series of transfers on different culture media containing 30 g/L sucrose and 100 mg/L myo-inositol. Secondary or recurrent somatic embryogenesis occurred within the immature somatic embryo radicles after 1 month of culture on growth regulator-free medium containing WPM macronutrients, MS micronutrients, and vitamins.

• The Journal of Asian Finance, Economics and Business
• /
• v.8 no.2
• /
• pp.1147-1156
• /
• 2021

This study aims to examine the role of resilience in academic engagement and also to evaluate the theoretical model of the relationships between resilience and engagement. A survey of faculty members in 20 study programs from 12 universities in Jakarta was conducted, Where 247 questionnaires were returned from the 495 distributed. Furthermore, 240 valid data were available for evaluation in order to test the model, and a confirmatory Structural Equation Modelling was conducted, using AMOS 20. Criteria of goodness-fit demonstrated the relatively adequate model, and the coefficient of structural path describes the potential of the links. Three out of four paths available significantly showed the role of developmental persistency and positive emotions on work engagement. The participants of the study include only constituted academics of private universities in Indonesia. Thus there is a need for better care in interpreting the level of resilience and engagement, as engagement may vary when used in a different context. The study suggests interventions for practitioners, not only for academia in the higher education context but also for other professionals in managing engagement at the individual or team level. Therefore, combining resilience and engagement programs may contribute to an enhancement in the productivity of employees.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.26 no.6
• /
• pp.390-396
• /
• 2021

Lithium-ion batteries have been designed and used as battery packs with series and parallel combinations that are suitable for use. However, due to its internal electrochemical properties, producing the battery's condition at the same value is impossible for individual cells. In addition, the management of characteristic deviations between individual cells is essential for the safe and efficient use of batteries as aging progresses with the use of batteries. In this work, we propose a method to manage deviation properties and detect abnormal behavior in the configuration of a combined battery pack of these multiple battery cells. The proposed method can separate and detect probabilistic low-frequency information according to statistical information based on Z-score. The verification of the proposed algorithm was validated using experimental results from 10S3P battery packs, and the implemented algorithm based on Z-score was validated as a way to effectively manage multiple individual cell information.

• Tribology and Lubricants
• /
• v.38 no.3
• /
• pp.115-119
• /
• 2022

This paper selected three kinds of grease with the same type but different consistency for the experiment. The purpose of the experiment is tested the effect of different consistency of grease on the wear of the gear surface. Different torque test groups were selected in the test, and the lubrication effect of different greases was tested in the test groups with the same torque. After each set of tests, the wear of the gear surfaces was observed and recorded. The data recorded in the experiment included the area of the wear area on the gear surface, the type of wear and the volume of wear. After the test, the gear surface roughness was measured. By calculating the wear volume, the effects of different concentrations of grease on the gear surface wear were compared. The experimental results show that under different stress conditions, the consistency of the grease has a great influence on the lubricating effect of the gear surface and the gear wear. Under the condition with low speed and high torque, different grease consistency affect the gear surface wear, the high consistency grease can reduce the wear of the gear surface, so that the gear can get better lubrication effect during the work.