• Korean Journal of Fisheries and Aquatic Sciences
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• v.29 no.5
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• pp.567-577
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• 1996

This study is to estimate population ecological parameters, including growth parameters, survival rates, instantaneous coefficients of natural and fishing mortalities, and age at first capture, as well as growth rates at age of the hairtail, Trichiurus lepturus Linne in Korean waters. For describing the growth of the hairtail, three growth models were fitted, and the von Bertalanffy growth model was adopted for the purpose of the further stock assessment work. The von Bertalanffy growth parameters estimated from a nonlinear regression using EXCEL Solver were $L_\infty=46.01cm$, K=0.3868, and $t_0=-0.3220$. Annual survival rate (S) of the hairtail was estimated to be 0.277 (variance=0.00035) and the instantaneous coefficient of natural mortality (M) was estimated to be 0.441/year. Instantaneous coefficient of fishing mortality (F) for the recent years was calculated as 0.843/year, implying an impact from fishing about two times greater than that of natural mortality. The age at first capture $(t_c)$ was estimated to be 0.787 years, which is much younger age than $50\%$ mature age. Finally, the growth rates at age were estimated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.4
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• pp.73-81
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• 2020

This study compared nursing service satisfaction and revisit intention of comprehensive nursing care unit and general care unit patients and confirmed the impact of nursing service satisfaction on revisit intention. We used data from 201 survey questionnaires collected from four general hospitals located in B-metropolitan area. Data were collected from Jun 1 to 30, 2019. The data were analyzed using x²-test, t-test, ANOVA, Scheffé test, Pearson's Correlation Coefficient, and Stepwise multiple regression. The results show that nursing service satisfaction was significantly higher in patients admitted to the comprehensive nursing care unit than in the general care unit. There was a significant correlation in increased nursing service satisfaction being associated with increased revisit intention. Among subcategories of nursing service satisfaction, Empathy and Tangibles were cited by 56% of the comprehensive nursing care unit and 40% of the general care unit. As a result of this study, it is necessary to prepare a nursing system that can continuously monitor nursing service satisfaction in order to increase hospital revisit intention and expand the implementation of a comprehensive nursing care unit system.

• Korean Journal of Environmental Biology
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• v.37 no.4
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• pp.554-567
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• 2019

Recently, concerns regarding the environmental impact due to nutrient input in croplands have increased. Therefore, the government is promoting the introduction of a nutrient management system in croplands to solve the problem of excessive nutrient input. This study was carried out to establish nutrient indicators in regional croplands to facilitate the introduction of the national nutrient management system in Korea. The nutrient load and balance indicators for nitrogen and phosphorus were analyzed for nine provinces (Gang-won, Gyeong-gi, Chung-buk, Chung-nam, Jeon-buk, Jeon-nam, Gyeong-buk, Gyeong-nam, and Jeju). In the correlation analysis between the nutrient load and nutrient balance, the correlation coefficient (r) for nitrogen was 0.2504, which was not statistically significant at the 5% significance level. However, the correlation coefficient for phosphorus was 0.7375, which was statistically significant at the 5% significance level. In the nutrient management index, phosphorus showed mutual compatibility between the nutrient load and the nutrient balance indicators, but nitrogen showed no mutual compatibility between the nutrient load and the nutrient balance indicators. Therefore, utilization of the nutrient balance indicator, reflecting the characteristics of the agricultural environment, was more reasonable as a nutrient management index for regional nutrient management.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.4
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• pp.231-242
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• 2016

The purpose of this study is to analyze the effects empowerment has on a lifelong educator's job satisfaction and organizational commitment. This study was implemented to amass and analyze the data from 160 Daejeon district's lifelong educators using SPSS 20.0. The statistical analysis was conducted with the following measures: frequency analysis for demographic characteristics, descriptive analysis, factor analysis with Varimax rotation for the validity of the measured variables, Cronbach's alpha coefficient for the reliability of the internal consistency between the variables, and Pearson's correlation coefficient to confirm the relevance between the variables. Our hypothesis was then verified through regression analysis. Our research results showed that, first, the level of empowerment differed depending on such factors as gender, age, education level, employee type, work hours, and monthly income. Second, empowerment was shown to have a significant influence on job satisfaction, where higher empowerment levels led to higher job satisfaction. Third, empowerment was a significant factor in increasing organizational commitment, as higher empowerment levels led to higher commitment. Therefore, this study reflected on the concept that empowerment was needed by lifelong educators, thus showing that enhancing job satisfaction and organizational commitment by developing the personal abilities of a lifelong institution educator is favorable to the institution's development and success.

• Journal of the Korean Society for Railway
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• v.14 no.5
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• pp.433-441
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• 2011

It is a fact that the straightening of track alignment is one of the undoubted ways to improve the train speed on conventional lines, while that requires huge investment resources. Therefore, the operation of a tilting train as well as the minimum improvement of track is suggested as an effective and economical alternative way for the speed-up of conventional lines. Since a driving mechanism of tilting train is different from those of existing trains, in order to make sure its operation safety and stability on conventional line, the performance of track and roadbed must be preferentially evaluated on the conventional line. Furthermore, it is necessary to estimate the tilting-train-induced roadbed response in detail since the roadbed settlement can lead to the track deformation and even derailment. In this research, the patterns of wheel load and lateral force were monitored and analyzed through the field tests, and the derailment coefficient and degree of wheel off-loading were calculated in order to evaluate the tilting train running safety depending on the running speeds (120km~180km) on the conventional line. Moreover, roadbed pressure, settlement and acceleration were also observed as tilting-train-induced roadbed responses in order to estimate the roadbed stability depending on the running speeds. Consequently, the measured derailment coefficient and degree of wheel off-loading were satisfied with their own required limits, and all of the roadbed responses were less than those of existing high-speed train (KTX) over an entire running speed range considered in this study. As a result of this study, the tilting train which will be operated in combination with existing trains is expected to give no adverse impact on the conventional line even with its improved running speed.

• Journal of the Korean Society of Hazard Mitigation
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• v.6 no.4 s.23
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• pp.37-47
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• 2006

Urban development results in increased runoff volume and flowrates and shortening in time of concentration, which may cause frequent flooding downstream. Flow retardation structures to limit adverse downstream effects of urban storm runoff are used. There are various types of flow retardation measures include detention basins, retention basins, and infiltration basins. In basic planning phase, a number of planning models of detention ponds which decide storage volume by putting main variables were used to design detention ponds. The characteristics of hydrological parameters $\alpha,\;\gamma$ which are used in planning models of detention pond were analyzed. In this study, detention ponds data of Disaster Impact Assessment report at 22 sites were analyzed in order to investigate correlation between characteristic of urban drainage basin parameter and characteristics of detention pond parameter due to urbanization effects. The results showed that storage volume was influenced by peak discharge ratio $\alpha$ more than runoff coefficient ratio $\beta$ and peak discharge ratio $\alpha$ was influenced by runoff coefficient ratio $\beta$ less than regional parameter n. Storage ratio was mainly influenced by duration of design rainfall in the case of trapezoidal inflow hydrograph such as Donahue et al. method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.1
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• pp.197-207
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• 2020

The purpose of this study was to identify the predictors of death anxiety among community-dwelling elderly cancer survivors in Korea. This study was a descriptive correlation study with 216 elderly cancer survivors who live in the jurisdiction of community health centers in Chugbuk province. Data of this study were collected from February 27 to March 15 2019 by a structured questionnaire. The data were analyzed using independent t-test, one-way ANOVA, Pearson's correlation coefficient, and hierarchical multiple regression. In the results, the mean score of death anxiety was 2.47±0.39 out of 4.0, while that of ego integrity was 2.60±0.29, depression 6.35±4.0, and awareness of a good death 2.97±0.35. Based on the hierarchical multiple regression analysis, subjects' awareness of a good death had the greatest impact on death anxiety (β = 0.255, p < .001), followed by depression (β = 0.185, p = .020) and religion (no= 1; β= 0.148, p = .021). These factors explained 16.4% of death anxiety (F=8.04, p<.001). Therefore, the results of this study are expected to be utilized as basic data for developing an intervention program that will be designed to reduce the death anxiety in elderly cancer survivors.

• Journal of the Korean Applied Science and Technology
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• v.38 no.4
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• pp.1129-1142
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• 2021

This study was conducted to identify the impact factors of SBAR reporting education applied during clinical practice of nursing students on communication clarity, communication satisfaction, reporting confidence, and communication competency. Data collection period was from December 1st, 2019 to December 20th, 2019 and two nursing universities extracted conveniently for third graders who completed clinical practice for more than six weeks. The number of eligible applicants is 103 who received SBAR reporting and training and 113 who did not receive training. Data were analyzed by t-tests, one-way ANOVA, Pearson's correlation coefficient analysis using the SPSS 21.0 program. Positive correlation were between communication clarity and communication competency(r=.52, p<.001), and between reporting confidence and communication satisfaction(r=.53, p<.001), communication competency and reporting confidence(r=.46, p<.001). communication competency was a significant influence factor with communication clarity(𝛽=.28, p<.001), communication satisfaction(𝛽=.43, p<.001), and reporting confidence(𝛽=.15, p=.009) 49.0% explanatory power. In conclusion, it is necessary for nursing students to develop educational systems and teaching methods to strengthen the reporting system by identifying practical skills during clinical practice.

• Geomechanics and Engineering
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• v.17 no.4
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• pp.343-354
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• 2019

The present study demonstrates the application of seismic petrophysics and amplitude versus angle (AVA) forward modeling to identify the reservoir fluids, discriminate their saturation levels and natural gas composition. Two case studies of the Lumshiwal Formation (mainly sandstone) of the Lower Cretaceous age have been studied from the Kohat Sub-basin and the Middle Indus Basin of Pakistan. The conventional angle-dependent reflection amplitudes such as P converted P ($R_{PP}$) and S ($R_{PS}$), S converted S ($R_{SS}$) and P ($R_{SP}$) and newly developed AVA attributes (${\Delta}R_{PP}$, ${\Delta}R_{PS}$, ${\Delta}R_{SS}$ and ${\Delta}R_{SP}$) are analyzed at different gas saturation levels in the reservoir rock. These attributes are generated by taking the differences between the water wet reflection coefficient and the reflection coefficient at unknown gas saturation. Intercept (A) and gradient (B) attributes are also computed and cross-plotted at different gas compositions and gas/water scenarios to define the AVO class of reservoir sands. The numerical simulation reveals that ${\Delta}R_{PP}$, ${\Delta}R_{PS}$, ${\Delta}R_{SS}$ and ${\Delta}R_{SP}$ are good indicators and able to distinguish low and high gas saturation with a high level of confidence as compared to conventional reflection amplitudes such as P-P, P-S, S-S and S-P. In A-B cross-plots, the gas lines move towards the fluid (wet) lines as the proportion of heavier gases increase in the Lumshiwal Sands. Because of the upper contacts with different sedimentary rocks (Shale/Limestone) in both wells, the same reservoir sand exhibits different response similar to AVO classes like class I and class IV. This study will help to analyze gas sands by using amplitude based attributes as direct gas indicators in further gas drilling wells in clastic successions.

• Journal of Hospice and Palliative Care
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• v.21 no.4
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• pp.124-136
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• 2018

Purpose: This descriptive study is aimed at identifying how nursing hospital workers' performance of end-of-life care is influenced by their knowledge and awareness of hospice palliative care, attitude towards end-of-life care, performance, importance, awareness of death and the factors. Methods: A self-reported questionnaire was used to collect data from 113 workers at an accredited nursing hospital in K province. Variables were their knowledge and awareness of hospice palliative care, attitude towards end-of-life care, end-of-life care performance and importance and awareness of death. An analysis was performed with the frequency, percentage, mean, standard deviation, t-test, ANOVA, Scheffe's test, Pearson's correlation coefficient and multiple regression using IBM SPSS 21.0. Results: The factors affecting the nursing hospital workers' end-of-life care performance were the importance of end-of-life care and their marital status, which showed an explanatory power of 38.2%. Conclusion: In order to improve the nursing hospital workers' end-of-life care performance, a training on the importance of end-of-life care should be provided. Therefore, we would like to propose establishing administrative measures such as 1) efficient staffing to help the caregivers better perform what they think is important, 2) development of a training program that can improve their performance of end-of-life nursing care and 3) a study to verify the effectiveness of the program.