• Water for future
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• v.56 no.4
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• pp.16-22
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• 2023

• Bulletin of the Korean Chemical Society
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• v.16 no.4
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• pp.379-381
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• 1995

• Bulletin of the Korean Chemical Society
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• v.20 no.5
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• pp.559-566
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• 1999

Gas-phase alkylations of delocalized ambident anions, Y---CH---X- where X, Y=CH2, O, or S, have been investigated theoretically at the MP2/6-31+G*//MP2/6-31+G* and QCISD/6-31+G*//MP2/6-31+G* lev-els. O-and S-alkylations (X=O and S) are more favored kinetically by ΔE^≠ = 4.6 and 9.8 kcal mol-1 than the respective C-alkylations even though they are thermodynamically less favored by 22.4 and 6.0 kcal mol-1 respectively. It was found that the transition structures for the C-alkylations are imbalanced due to the endoergic rehybridi-zation of the carbon center from sp2 to sp3 which leads to premature bond contraction of the C-Y bond and delayed bond stretching of the C-X bond. In the O-, or S-alkylation, such endoergic process is not required since the σ-lone pair on O or S is involved in the initial stage of alkylation. The imbalanced TSs for the C-alkylation are accompanied by higher intrinsic barriers and deformation energies.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2012.10a
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• pp.355-356
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• 2012

• Water for future
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• v.52 no.3
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• pp.17-22
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• 2019

• Water for future
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• v.55 no.10
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• pp.54-61
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• 2022

• Journal of Home Health Care Nursing
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• v.30 no.3
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• pp.264-275
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• 2023

Purpose: The aim of this study was to examine the influence of second victim experiences following patient safety incidents and positive psychological capital on the intention to remain among advanced beginner nurses working at tertiary hospitals. Methods: The participants were 179 nurses with a clinical experience of 13 to 36 months at two tertiary hospitals. We collected data using questionnaires related to second victim experiences, positive psychological capital, and intention to remain. Data were analyzed using descriptive statistics, independent t-test, a one-way analysis of variance (ANOVA), Scheffé test, Pearson correlation, and hierarchical regression analysis. Results: The intention to remain in advanced beginner nurses was negatively correlated with second victim experiences and positively correlated with positive psychological capital. A hierarchical multiple regression model with control variables (subjective job satisfaction and self-assessed work proficiency), psychological capital, and second victim experience accounted for 26% of the factors that influenced advanced beginner nurses' intention to remain. Among the related factors, the most influential was subjective job satisfaction. Second victim experience and positive psychological capital also influenced the advanced beginner nurses' intention to remain. Conclusion: The results of this study suggest a need to develop a program that helps promote intention to remain for nurses at the advanced beginner stage by minimizing second victim experiences and improving positive psychological capital and the work environment.

• Korean journal of dermatology
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• v.56 no.9
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• pp.556-560
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• 2018

Congenital hemangioma (CH) is a fully formed benign vascular tumor at the time of birth and do not proliferate in postnatal life. CH must be differentiated from infantile hemangioma. CH has three subtypes that are recognized based on their natural history: Rapidly involuting congenital hemangioma (RICH), non-involuting congenital hemangioma (NICH), and partially involuting congenital hemangioma (PICH). It is important to distinguish RICH from NICH because RICH spontaneously regresses but NICH does not. Herein, we report two patients diagnosed with RICH and NICH, respectively. We presented the clinical features as well as ultrasonographic and histologic findings to distinguish congenital from infantile hemangioma.

• Korean Journal of Materials Research
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• v.31 no.10
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• pp.569-575
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• 2021

The reactivity evaluation of copper is performed using ethylenediamine, aminoethanol, and piperidine to apply organic chelators to copper etching. It is revealed that piperidine, which is a ring-type chelator, has the lowest reactivity on copper and copper oxide and ethylenediamine, which is a chain-type chelator, has the highest reactivity via inductively coupled plasma-mass spectroscopy (ICP-MS). Furthermore, it is confirmed that the stable complex of copper-ethylenediamine can be formed during the reaction between copper and ethylenediamine using nuclear magnetic resonance (NMR) and radio-thin layer chromatography. As a final evaluation, the copper reactivity is evaluated by wet etching using each solution. Scanning electron micrographs reveal that the degree of copper reaction in ethylenediamine is stronger than that in any other chelator. This result is in good agreement with the evaluation results obtained by ICP-MS and NMR. It is concluded that ethylenediamine is a prospective etch gas for the dry etching of the copper.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.45-46
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• 2021

본 논문에서는 제조산업의 제품 품질검사의 자동화를 위한 딥러닝 기법을 제안하고 모델의 성능 최적화를 위한 특징 추출 필터의 크기를 비교한다. 이미지 특징을 자동 추출할 수 있는 CNN을 사용하여 전문인력 없이 제품의 표면 결함을 검출하고 제품의 적합성을 판단할 수 있는 이미지 처리 알고리즘을 구축하고 산업 현장에 적용하기 위한 검증 지표로 검출 정확도와 연산속도를 측정하여 결함 검출 알고리즘의 성능을 확인한다. 또한 연산량에 따른 성능 비교를 위해 필터의 크기에 따른 CNN의 성능을 비교하여 결함 검출 알고리즘의 성능을 최적화한다. 본 논문에서는 커널의 크기를 다르게 적용했을 때 빠른 연산으로 높은 정확도의 검출 결과를 얻었다.