• Journal of the Korea Convergence Society
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• v.12 no.11
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• pp.445-456
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• 2021

In this study, we examine the effects of five needs satisfaction on job satisfaction and turnover intention based on Maslow's hierarchy of needs for clinical nurses. Also, this was a convergence study that confirmed the mediating effect of job satisfaction on the relationship between need satisfaction and turnover intention. The participants were 239 clinical nurses at a general hospital located in Seoul. The collected data were analyzed for mediating effects using hierarchical regression analysis and PROCESS Macro (Model 4). Physiological and safety needs did not have a significant effect on job satisfaction while belongingness, esteem, and self-actualizations need had a significant positive effect on job satisfaction. On the other hand, physiological and esteem needs had a significant negative effect on turnover intention. In addition, the mediating effect of job satisfaction was significant in the relationship between need satisfaction (physiological, safety, belongingness, and self-actualization needs) and turnover intention. We confirm that an increase in the satisfaction of the five needs of clinical nurses can reduce their turnover intention. Therefore, we suggest that it is necessary to effectively manage need satisfaction and job satisfaction in the clinical field.

• Journal of Industrial Convergence
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• v.21 no.5
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• pp.67-75
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• 2023

This study is a descriptive research study to confirm the mediating effect of work-life balance in the relationship between grit and job embeddedness of clinical nurses. Participants included 155 nurses from four hospitals located in D city. Data was collected from July 29 to August 19, 2022 using a self-report questionnaires. The collected data were analyzed by descriptive statistics, Pearson's correlation coefficient and Baron and Kenny's three-step hierarchical regression using the SPSS 22.0 program. In this study, it was found that there was a significant positive correlation between the nurse's grit, job embeddedness, and work-life balance, and it was confirmed that work-life balance partially mediated the relationship between grit and job embeddedness. Therefore, it is suggested that grit and work-life balance should be improved in order to improve the job embeddedness of nurses.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1A
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• pp.45-54
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• 2006

To obtain realistic stress-strain relation in concrete, it is necessary to improve the constitutive model for creep and shrinkage of concrete. This study is made up with predicting model of creep using rheological approach and mathematical development which is solution for phenomenon of concrete creep. Long-term deformation components are combined based on traditional 4-parameters model. Creep deformation is obtained adequately using 4-parameters determined by considering aging effect and microprestress among gels. And coefficient of effective viscosity is able to represent both basic creep and total creep included drying creep. This study attempt to establish mathematical model considering effects of aging, hydration, and variations of pore humidity. It can predict both basic creep and total creep. Values of result between prediction and experiment have greater than correlation factor 99%. Additionally experimental results report bad consentaneity with highway design specification adopting FIB MC 90. Rather than those are similar to FIB MC 90 rev.99.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.35-35
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• 2017

유역 물순환 개선 기술은 기후변화 및 토지이용변화가 진행 중에 있거나 예상되는 지역에 대하여 강우-유출수를 지연, 저류, 침투시켜 지속가능한 물순환체계를 유지?회복하도록 하는 기술이라 할 수 있다. 기후변화 및 토지이용변화에 따른 영향을 평가하고, 지속가능한 유역 물순환체계를 구축하여 적응 전략을 체계적으로 수립하기 위해서는 물순환 개선 기술의 정립 및 개발이 필수적이다. 그러나 현재 유역 물순환 개선기술은 일부 시가화 지역에 국한되어 있어 유역 규모의 개선 전략을 수립하는데 한계가 있다. 또한, 물순환계의 변화량을 평가하기 위한 모형화 기법 역시 해외에서 개발된 기술을 여과 없이 도입하여 국내의 환경을 충분히 반영하기는 어렵다. 개발된 유역 물순환 개선 및 평가시스템은 기존 국가연구개발사업을 통해 개발되고 사업화에 성공한 바 있는 유역 물순환 평가 모형인 CAT(Catchment hydrologic cycle Assessment Tool)을 수정 및 개선하여 기후변화에 따른 영향을 평가하고 적응 대책을 수립하기 위한 실무적인 소프트웨어이다. 침투트렌치, 식생침투트렌치, 습지, 저류지, 빗물탱크 등의 물순환개선시설에 대한 효과를 평가할 수 있도록 개별시설의 제원에 따른 물순환개선 효과를 정량적으로 평가하여 제시한다. 기후변화에 따른 장기간의 유역 물순환을 평가하기 위해서는 물리적 매개변수 기반의 수문해석 보다는 단순환된 개념적 매개변수 기반의 집중형 장기유출 해석이 필요할 수 있다. 따라서 국내외에서 많이 사용되고 있는 장기 일유출 모형(GR4J, GSM, HBV, SYMHYD, TANK, TPHM 등)을 유역 물순환 개선 평가 플랫폼에 탑재함으로써 소유역의 특성을 반영한 기후변화 적응 일유출 해석이 가능하도록 하였으며, 각 모형들의 매개변수는 수동보정 외에도 SCE-UA를 이용한 자동보정이 가능하도록 시스템으로 구축하였다. 개발된 유역물순환 개선 및 평가시스템은 실무적 차원에서 기후변화에 따른 유역 물순환 개선 기술을 적용하고 평가하는데 있어서 매개변수 입력자료 구축에 따른 자원 소요 시간 및 시스템 개발 비용을 획기적으로 단축시켰으며 국외 의존도가 높은 수문 해석모형을 국내 기술로 개발함으로써 기술자립도를 높이고 국내 및 해외의 유역의 성공적인 적용을 통하여 성능을 입증하였다. 기후변화에 따른 수자원의 재평가, 개선시설의 정량적 평가 및 하천유역의 수자원관리 실무에 적용성이 높을 것으로 기대된다.

• Journal of Korea Water Resources Association
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• v.54 no.12
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• pp.1295-1304
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• 2021

For the efficient use and management of water resources, a reliable rainfall-runoff analysis is necessary. Still, continuous hydrological data and rainfall-runoff data are insufficient to secure through measurements and models. In particular, as part of the reasonable improvement of a rainfall-runoff model in the case of an ungauged watershed, regionalization is being used to transfer the parameters necessary for the model application to the ungauged watershed. In this study, the GR4J model was selected, and the SCEM-UA method was used to optimize parameters. The rainfall-runoff model for the analysis of the correlation between watershed characteristics and parameters obtained through the model was regionalized by the Copula function, and rainfall-runoff analysis with the regionalized parameters was performed on the ungauged watershed. In the process, the intermediate state variables of the rainfall-runoff model were extracted, and the correlation analysis between water level and the ground water level was investigated. Furthermore, in the process of rainfall-runoff analysis, the Standardized State variable Drought Index (SSDI) was calculated by calculating and indexing the state variables of the GR4J model. and the calculated SSDI was compared with the standardized Precipitation index (SPI), and the hydrological suitability evaluation of the drought index was performed to confirm the possibility of drought monitoring and application in the ungauged watershed.

• Korea Trade Review
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• v.42 no.6
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• pp.69-85
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• 2017

In 2014, India legalized corporate social responsibility(CSR) for foreign companies and enforced it. Meanwhile, one of the Korean companies' concerns is that the turnover rate of employees is very high. Therefore, this study was conducted in four dimensions. First, Korean IT companies in India ought to work on CSR activities so this study investigates to see if CSR can reduce employee turnover rate. Second, the study is to verify whether job embeddedness plays mediating role in the relationship between CSR and 'intention to leave'. Third, the study is also to verify whether organizational identification plays mediating role in the relationship between CSR and 'intention to leave'. Lastly, the study is also to verify whether job embeddedness and organizational identification show dual mediation effect in the relationship between CSR and 'intention to leave'. The results of the study are as follows ; First, CSR does not make any significant effect on 'intention to leave'. Second, job embeddedness and organizational identification show dual mediation effect in the relationship between CSR and 'intention to leave'. So if Korean IT firms in India conduct CSR activities strategically, the activities can eventually reduce the propensity of 'intention to leave'. Based on the results, several implications on Korean IT firms are suggested for reducing the propensity of 'intention to leave' in India, effectively.

• Journal of the Korean GEO-environmental Society
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• v.8 no.4
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• pp.19-25
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• 2007

Process analysis with ASM3 (Activated Sludge Model3) was performed to offer basic data for the optimization of aerated biofilter (ABF) process design and operation. This study was focused on the simulation of the nitrification reaction in ABF which was a part of the advanced nutrient treatment process using bio-adsorption. The ABF process has been developed for the removal of suspended solids and nitrification reaction in sewage. A GPS-X (General Purpose Simualtor-X) was used for the sensitivity analysis and operation assessment. Sensitivity of ASM3 parameters on ABF was analysed and 4 major parameters ($Y_A$, $k_{sto}$, ${\mu}_A$, $K_{A,HN}$) were determined by dynamic simulation using 70 days data from pilot plant operation. The optimized values were 0.14 for $Y_A$, 3.5/d for $k_{sto}$, 2.7/d for ${\mu}_A$ and 1.1 mg/L for $K_{A,HN}$, respectively. Simulation with optimized parameter values were conducted and TN, $NH_4{^+}-N$ and $NO_3{^-}-N$ concentrations were estimated and compared with measured data at the range of 10 min to 4 hrs of hydraulic retention time (HRT). The simulated results showed that optimized parameter values could represent the characteristics of ABF process. Especially, the ABF showed relatively high nitrification rate (60%) under very short HRT of 10 min. As a consequence, the ABF was thought to be successfully used in the site which having high variation of influent loading rate.

• Journal of the KSME
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• v.55 no.8
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• pp.45-48
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• 2015

이 글에서는 조명 및 디스플레이 산업의 성장으로 인해 종래의 '색채'와 구분되는 '디지털 컬러'라는 새로운 개념이 대두됨에 따라, 빛을 매개로 디스플레이 되는 컬러와 이에 대한 사용자의 감성정보 및 색온도, 휘도, 전력소모량 등 특성적 정보의 정량화, 표준화 기반에 대한 필요성과 방향에 대해 소개하고자 한다.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.346-351
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• 1986

본 논문에서는 과거 10여년 동안의 Robust제어기에 관한 연구동향을 조사 요약하였다. Robust제어기에 관한 연구는 제어시스템의 Robustness 분석과 Robust한 제어기 설계방법으로 나뉘며 Robustness 분석은 불확실성이 구조를 갖는 경우와 구조가 없는 경우로 나뉘어 연구된다. Robust한 제어기 설계 방법에는 LQG/LTR방법과 제어기 매개변수화등이 있다. 본 논문에서는 각 방법들을 간략히 소개하고 이들을 비교하였다.

• 전기의세계
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• v.20 no.1
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• pp.45-47
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• 1971

공업전자의 현황과 전망에서는 SCR을 주축으로 한 반도체소자를 이용한 Energy변환 및 제어의 분야의 반도체소자를 매개로한 Energy변환과 제어 및 기계의 전자화된 조절장치를 체계화한 전기공학의 분야에 대해 설명했으며, 우주통신과 우주선 추적에서는 아폴로 S대통일계통, Goddard식 거리속도추적계통, 중계위성에 대해 설명했으며 Feedback inbiological systmems lecture notes에서는 Familar definition of Feedback, Definition of Control Feedback에 대해 논하였다.