• Applied Chemistry for Engineering
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• v.28 no.1
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• pp.118-124
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• 2017

An air cooling, open cathode type polymer electrolyte membrane fuel cell (PEMFC) has the advantages of system simplification and cost effectiveness. Open cathode PEMFC could suffer from reduced performance due to the membrane dehydration in low humidity of air. Effects of the cathode air flow rate, anode purge interval and long term storage on PEMFC performance were investigated in this work. Fan voltage is an important factor on air cooling PEMFC performance because the cathode air flow rate and stack temperature were controlled by fan voltage. The dead ended anode (DEA) method was applied to increase hydrogen usage. Periodical purge was used to discharge accumulated water and gas. The influence of long term non-operating condition on PEMFC performance degradation due to the membrane dehydration was also studied and the quick recovery method was developed.

• Korean Journal of Soil Science and Fertilizer
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• v.51 no.2
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• pp.111-118
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• 2018

A field experiment was conducted to investigate the effect of long-term (21-year) fertilizer and compost treatments on the yield of red pepper and chemical properties in top-dong, Suwon. Six treatments were chosen for this work: No fertilization (No fert.), NPK fertilizers (NPK), NPK and compost (NPK+Compost), NP and compost (NP+Compost), NK and compost (NK+Compost), PK and compost (PK+Compost). The yield of red pepper for 21 years indicated the significant differences among the No fertilization, the PK+Compost, and other treatments. The relative yield index was 13% and 59% respectively, for the No fertilization and the PK+Compost if the average yield of red pepper for the NPK regards $20,048kg\;ha^{-1}$ as the yield index with 100%. Soil organic matter at the compost applied treatments significantly increased compared with the No fert. and the NPK. The average increase rates of soil organic matter by applying the compost ranged from 0.69 to $0.73g\;kg^{-1}\;yr^{-1}$. Available phosphate content in soil appeared the significant increase all treatments excluding the No fert. It is estimated that the available phosphate in soil was increased by $7.0mg\;kg^{-1}\;yr^{-1}$ by applying compost and $14.2mg\;kg^{-1}\;yr^{-1}$ by applying P fertilizer. Application of K fertilizer or the compost alone, the NPK, the NP+Compost, continuously caused soil K depletion whereas K fertilization plus the compost maintained at a constant level of exchangeable K. The results indicated that the addition of compost to NPK fertilizer is recommended for the maximum stable yield for red pepper and enhancement of organic matter though it is also needed for adjusting of P and K fertilization.

• Advances in concrete construction
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• v.10 no.6
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• pp.547-557
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• 2020

This paper presents one of the demonstration projects undertaken during the FP7 EU-funded Anagennisi project (Innovative reuse of all tyre components in concrete-2014-2017) on a full-scale (30 m×40 m, thickness: 0.2 m) Steel Fibre Reinforced Concrete (SFRC) slab-on-grade using a blend of manufactured steel fibres (MSF) and Recycled Tyre Steel Fibres (RTSF). The aim of the project was to assess the use of RTSF in everyday construction practice. The Anagennisi partners, Dulex Ltd in collaboration with Gradmont-Gradacac Ltd and University of Zagreb, designed, cast and monitored the long-term shrinkage deformations of the indoor slab-on-grade slab at Gradmont's precast concrete factory in Gradacac, Bosnia and Herzegovina. A hybrid RTSF mix (20 kg/㎥ of MSF+10 kg/㎥ of RTSF) was used to comply with the design criteria which included a maximum load capacity of 20 kN/㎡. The slab was monitored for one year using surveying equipment and visual inspection of cracks. During the monitoring period, the slab exhibited reasonable deformations (a maximum displacement of 3.3 mm for both, horizontal and vertical displacements) whilst after five years in use, the owners did not report any issues and were satisfied with the construction methodology and materials used. This work confirms that RSTF is a viable and sustainable solution for slab-on-grade applications.

• Journal of Home Health Care Nursing
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• v.30 no.1
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• pp.26-36
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• 2023

Purpose: This study investigated the organizational culture in hospital for infection control, moral sensitivity, and the degree of infection control among long-term care hospital nurses, and to identified the factors associated with infection control perfomance. Methods: 186 nurses who directly care for patients at seven Long-Term Care Hospitals in D Metropolitan City participated in the survey. Data were collected using self-reported questionnaires and analyzed using the IBM SPSS 26.0 software. Results: Moral sensitivity showed statistically significant differences in age (F=5.473, p=.065), clinical experience (F=8.890, p=.031), nursing hospital work experience (F=6.520, p=.038), religion (t=-2.01, p=.046) and position (t=-2.96, p=.003). Correlation analysis revealed that with moral sensitivity and effect of organizational culture on infection control, there was a positive correlation between infection control and patient-centered nursing (r=.201, p<.006), professionalism (r=.149, p<.042), benevolence (r=.303, p<.001), infection control organizational culture (r=.556, p<.001). Benevolence of moral sensitivity (β=.21, p=.001) and infection control organizational culture (β=.54, p<.001) were associated with infection control perfomance. Moral sensitivity (including patient-centered nursing, professionalism, and benevolence) and infection control organizational culture explained 33.8% of the variance in infection control (F=24.57, p<.001). Conclusion: It is important to improve the moral sensitivity of nurses and a positive organizational culture for better infection control. We need to develop intervention strategies and establish systematic and administrative support.

• International Journal of Computer Science & Network Security
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• v.23 no.3
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• pp.177-186
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• 2023

Hyperspectral imaging technology is one of the most efficient and fast-growing technologies in recent years. Hyperspectral image (HSI) comprises contiguous spectral bands for every pixel that is used to detect the object with significant accuracy and details. HSI contains high dimensionality of spectral information which is not easy to classify every pixel. To confront the problem, we propose a novel RGB channel Assimilation for classification methods. The color features are extracted by using chromaticity computation. Additionally, this work discusses the classification of hyperspectral image based on Domain Transform Interpolated Convolution Filter (DTICF) and 3D-CNN with Bi-directional-Long Short Term Memory (Bi-LSTM). There are three steps for the proposed techniques: First, HSI data is converted to RGB images with spatial features. Before using the DTICF, the RGB images of HSI and patch of the input image from raw HSI are integrated. Afterward, the pair features of spectral and spatial are excerpted using DTICF from integrated HSI. Those obtained spatial and spectral features are finally given into the designed 3D-CNN with Bi-LSTM framework. In the second step, the excerpted color features are classified by 2D-CNN. The probabilistic classification map of 3D-CNN-Bi-LSTM, and 2D-CNN are fused. In the last step, additionally, Markov Random Field (MRF) is utilized for improving the fused probabilistic classification map efficiently. Based on the experimental results, two different hyperspectral images prove that novel RGB channel assimilation of DTICF-3D-CNN-Bi-LSTM approach is more important and provides good classification results compared to other classification approaches.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.857-866
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• 2022

The current study is a meta analysis study to identify the factors related to infection management performance and the effect size according to the factors. Data collection was included from the data of KMBASE, RISS, KISS, DBpia, National Library of Korea, Pubmed, and EMBASE. R3.5.1 was used for the data analysis. A total of 22 factors were identified. The meta analysis showed the effect size as follows: gender(.16), age(.30), education(.32), beds(.28), needs of education in infection management(.44), participating in education of infection management(.25), recognition/knowledge in infection management(.70). Based on the findings, evidence based programs need to be provided to improve the infection management performance of health workers at Long-Term Care Hospitals.

• Journal of the Korean Society for Library and Information Science
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• v.58 no.3
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• pp.287-308
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• 2024

This study was conducted as a foundational research to establish a mid- to long-term comprehensive development plan for public libraries of Gapyeong-gun. To achieve the research objectives, surveys and interviews were conducted with local residents and library officials. The key discussion based on the findings are as follows. First, there is a need to run lifelong programs and tailored programs for the information disadvantaged. Second, it is necessary to secure the latest library materials. Third, there is a need to work closely with private and school libraries in the county for efficient collection management and service. Fourth, consideration should be given to the creation of a complex cultural space where people can enjoy various leisure and cultural activities. Fifth, active publicity activities are needed. Sixth, additional library staff should be recruited to maintain and improve the satisfaction of local residents and operate efficiently. Seventh, it is necessary to create a space for efficient collection management.

• The Journal of the Korea Contents Association
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• v.21 no.1
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• pp.561-571
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• 2021

The 2017 Pohang earthquake left us with issues related to long-term repair and restoration from massive earthquake damage. The existing Earthquake response manual was insufficient to consider the flow of earthquake disaster work and the characteristics of long-lasting earthquake disaster. Accordingly, It is important to analyze and record how to earthquake response work was carried out during the Pohang earthquake. The functions that require the most work and manpower in the event of an earthquake disaster were emergency life stabilization support, facility emergency recovery, and energy functional restoration. As a result of analyzing the difficulties and problems of disaster response by function, it was found that the prevention and preparation for damage in advance was insufficient for each function. In conclusion, we subdivided the response step applied with the concept of time and presented the overall work flow process for thirteen collaboration functions. It is expected that this result will help disaster managers to work effectively in the event of a large scale earthquake.

• Journal of Korean society of Dental Hygiene
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• v.22 no.1
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• pp.47-54
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• 2022

Objectives: The purpose of this study was to examine the association between work environment and positive psychological capital on job embeddedness in dental hygienists. Methods: Data were collected from 263 dental hygienists in the dental institutions. It was then assessed by mean of descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and a stepwise multiple regression analysis. Results: The impact of work environment was 3.35±0.46 points, positive psychological capital was 3.30±0.40 points, and job embeddedness was 3.34±0.47 points. The result of the stepwise multiple regression analysis indicated that work environment, positive psychological capital and clinical career predicted 45.7% (F=7.35, p<0.001) of job embeddedness. Conclusions: Therefore, it is necessary to improve working environment and to strengthen positive psychological capital in order to increase the degree of work commitment in dental hygienists, and to encourage long-term service.

• Korea Journal of Hospital Management
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• v.28 no.4
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• pp.47-61
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• 2023

Purpose: The purpose of this study was to identify the influential factors on job satisfaction among nursingassistants working in medical institutions. Methods: Small and medium-sized hospitals and general hospitals (S City, U City, N City), 11 Geriatric hospitals(S City, N City, U City, T City, I City), and 29 clinics (S City, I City, N City). Data was collected from 194employed nursing assistants from February 15 to April 15, 2021. The obtained data were analyzed usingdescriptive statistics, ANOVA, Scheffe's test, Pearson's correlation analysis, and hierarchical regression analysis. Results: We confirmed a positive correlation between job satisfaction and organizational commitment, andconducted a hierarchical multiple regression analysis using monthly income, work-life balance, organizational commitment, and work confidence as influencing factors for job satisfaction, and found that organizational commitment and work confidence were significant influencing factors for job satisfaction. Conclusion: To improve the job satisfaction of nursing assistants, it is necessary to improve their understanding of the organizational culture in the workplace and expand education and training opportunities to enhance their work confidence to induce long-term retention. In addition, it was suggested that clear job scope and adequatecompensation are necessary for efficient human resource management.