• 한국직업건강간호학회지
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• 제23권4호
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• pp.262-268
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• 2014

Purpose: This study was conducted to identify the differences by the stages of change in exercise behaviors of caregivers based on Transtheoretical Model. Methods: The subjects were consisted of randomly chosen 105 caregivers working in a nursing home. The collected data were analyzed with descriptive statistics, chi-square test, ANOVA and Duncan test using IBM SPSS Statistics 19. Results: The results showed that in the stages of exercise behaviors, there were most participants in contemplation stage with 24.7%, followed by 22.8% in preparation, 21.9% maintenance, 19.0% action and 11.4% pre-contemplation. As for the process of change by the stages of change in exercise behaviors, it showed statistically significant differences in behavioral strategies (F=7.64, p<.001). In decisional balance, pros (F=3.75, p=.007) showed statistical significance, with higher pros in all stages except pre-contemplation. Self-efficacy was also statistically significant (F=6.25, p<.001), especially in the maintenance stage. Conclusion: This study suggested that in order to encourage caregivers to exercise, a strategic intervention to reinforce the process of change, recognition of positive decision-making and promotion of self-efficacy in exercise behaviors should be developed.

• 한국구조물진단유지관리공학회 논문집
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• 제24권3호
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• pp.26-38
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• 2020

자기 충전형 콘크리트의 배합물 설계는 전형적인 다기준의사결정의 과정이다. 본 연구에서는 실험설계법과 반응표면법을 이용하여 SCC 배합물 전산 설계가 가능하도록 재료성능 및 비용모델을 생성하고, 요구조건을 반영한 여러 성능 사이의 상대적 중요도를 산정하여 가중 다목적 설계문제로 정식화하여 수치최적해를 계산함으로써 비용효율을 고려한 SCC최적설계를 수행하였다. 실험비용과 시간을 고려하여 SCC의 수많은 요구성능 중 압축강도, 철근충전성, 재료분리저항성, 비용정보 등을 다목적 최적화의 목적함수로 설정하였다. 재료경제성을 최적재료설계프로세스에 합리적으로 반영함으로써 경제적 콘크리트배합설계를 수행할 수 있었으며, 본 연구 결과 실험점 계획에서부터 최적해 산출에 이르는 과정을 객관적인 프로세스로 구성함으로써 콘크리트 범용 최적재료설계기술 및 전산화를 기대할 수 있다.

• Tribology and Lubricants
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• 제39권4호
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• pp.133-138
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• 2023

This paper presents a discussion on lubricating oil filters. The maintenance of lubricating oil filters can improve the performance of mechanical systems and extend the service life of the lubricating oil. Therefore, the effective management of the lubricating oil can extend the service life of the machine and reduce maintenance costs. A representative method for managing lubricating oil is filtering the lubricating oil using a lubricant filter. However, effectively managing a lubricating oil using a lubricant filter requires an understanding of the related knowledge. In this paper, we present the definition, classification, characteristics, specifications, performance, and self-cleaning function of lubricating oil filters. The lubricant filters are classified based on the filter material, filtering method, filtering location, and amount of filtered fluid. Cellulose and glass fiber materials are conventionally used as materials for lubricant filters, and recently, metal materials, which show excellent durability, are being increasingly adopted. The filtering methods can be classified into physical, chemical, magnetic, and electric field methods, and the lubricant filters can be classified according to their location in the lubrication system. The beta ratio and efficiency of the lubricant filter can be determined based on the performance of the filter. Finally, there are many products or technologies that add a self-cleaning function to the filter to remove foreign substances or contaminants for efficient management.

• International Journal of Stem Cells
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• 제16권1호
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• pp.44-51
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• 2023

Background and Objectives: DNA methyltransferases (Dnmts) play an important role in regulating DNA methylation during early developmental processes and cellular differentiation. In this study, we aimed to investigate the role of Dnmts in neural differentiation of embryonic stem cells (ESCs) and in maintenance of the resulting neural stem cells (NSCs). Methods and Results: We used three types of Dnmt knockout (KO) ESCs, including Dnmt1 KO, Dnmt3a/3b double KO (Dnmt3 DKO), and Dnmt1/3a/3b triple KO (Dnmt TKO), to investigate the role of Dnmts in neural differentiation of ESCs. All three types of Dnmt KO ESCs could form neural rosette and differentiate into NSCs in vitro. Interestingly, however, after passage three, Dnmt KO ESC-derived NSCs could not maintain their self-renewal and differentiated into neurons and glial cells. Conclusions: Taken together, the data suggested that, although deficiency of Dnmts had no effect on the differentiation of ESCs into NSCs, the latter had defective maintenance, thereby indicating that Dnmts are crucial for self-renewal of NSCs.

• 한국구조물진단유지관리공학회 논문집
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• 제13권1호통권53호
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• pp.161-168
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• 2009

본 연구에서는 강섬유보강 콘크리트의 시공성 및 품질향상 방안의 일환으로 고유동 자기충전 콘크리트(HSCC)에 형상비 및 길이를 달리한 강섬유(SF)를 혼입한 콘크리트를 제조하여 강섬유보강 일반콘크리트(CC)와 유동 및 강도 특성을 비교 검토하였다. 실험결과 SF를 혼입한 HSCC는 높은 유동성 및 점성의 영향으로 SF 자체의 뭉침현상이 발생하지 않아 강섬유보강 CC의 경우보다 유동성능 및 통과성능이 크게 향상 되었으며, 동일한 압축강도 범위에서 SF를 혼입하지 않은 HSCC의 경우보다 쪼갬 및 휨강도는 SF의 형상비와 관계없이 길이가 길어질수록 증가하는 경향이 나타났다. 이상의 실험결과를 통하여 강섬유를 혼입한 HSCC를 현장 적용할 경우 기존에 사용되고 있는 강섬유보강 CC의 경우보다 시공성 및 품질 향상이 가능할 것으로 판단된다.

• 기독교교육논총
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• 제78권
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• pp.213-229
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• 2024

연구 목적 : 본 연구의 목적은 학업성취에 많은 영향을 주는 대학생의 자기효능감에 대한 그릿의 영향을 자기통제가 매개효과를 가지고 있는지 검증하는 것이다. 연구 내용 및 방법 : 본 연구는 대학생의 자기효능감에 대해 그릿과 자기통제의 영향을 검증하기 위해서 먼저 자기효능감과 그릿과 자기통제의 측정도구를 선택하여 온라인 설문지를 제작하였다. 다음으로 연구 대상을 충남 소재 A대학의 재학생 128명에게 설문을 조사하였다. 수집된 자료는 자료의 정규성과 요인 간의 다중공선성을 검증하기 위해서 기술통계분석과 이변량 상관분석을 수행하였다. 이와 함께 자기효능감에 대한 그릿과 자기통제의 영향을 검증하기 위해서 다중회귀분석을 사용하여 분석하였다. 다음으로 자기효능감에 대한 그릿의 영향을 자기통제가 매개하는지 검증하기 위해 구조방정식 모형을 사용해서 분석하였다. 분석 결과, 자기효능감 전체는 자기통제의 신뢰성과 그릿의 학업적 열정이 영향을 주었다. 자기효능감의 하위 요인인 자신감은 자기통제의 신뢰성과 그릿의 학업적 열정이 영향을 주었다. 자기조절 효능감은 자기통제의 신뢰성과 그릿의 학업적 끈기가 영향을 주었다. 과제 난이도 선호는 그릿의 학업적 흥미 유지와 자기통제의 절제가 영향을 주었다. 다음으로 자기통제는 자기효능감에 대한 그릿의 영향을 매개하는 것으로 나타났다. 결론 및 제언 : 본 연구는 대학생의 자기효능감에 대한 그릿과 자기통제의 영향을 탐색하였다 그 결과 자기효능감에 그릿과 자기통제가 정적 영향을 주었다. 또한 자기통제는 자기효능감에 대한 그릿의 영향을 매개하는 것으로 나타났다. 본 연구는 대학생의 성공적인 학업성취 지원을 위해서 그릿과 자기통제를 지원해 줄 것을 제안한다.

• Asian-Australasian Journal of Animal Sciences
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• 제29권10호
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• pp.1398-1406
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• 2016

In general, the seminiferous tubule basement membrane (STBM), comprising laminin, collagen IV, perlecan, and entactin, plays an important role in self-renewal and spermatogenesis of spermatogonial stem cells (SSCs) in the testis. However, among the diverse extracellular matrix (ECM) proteins constituting the STBM, the mechanism by which each regulates SSC fate has yet to be revealed. Accordingly, we investigated the effects of various ECM proteins on the maintenance of the undifferentiated state of SSCs in pigs. First, an extracellular signaling-free culture system was optimized, and alkaline phosphatase (AP) activity and transcriptional regulation of SSC-specific genes were analyzed in porcine SSCs (pSSCs) cultured for 1, 3, and 5 days on non-, laminin- and collagen IV-coated Petri dishes in the optimized culture system. The microenvironment consisting of glial cell-derived neurotrophic factor (GDNF)-supplemented mouse embryonic stem cell culture medium (mESCCM) (GDNF-mESCCM) demonstrated the highest efficiency in the maintenance of AP activity. Moreover, under the established extracellular signaling-free microenvironment, effective maintenance of AP activity and SSC-specific gene expression was detected in pSSCs experiencing laminin-derived signaling. From these results, we believe that laminin can serve as an extracellular niche factor required for the in vitro maintenance of undifferentiated pSSCs in the establishment of the pSSC culture system.

• 대한간호학회지
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• 제26권2호
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• pp.413-427
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• 1996

This study was conducted to test the effect of a self regulation education program as a nursing intervention with chronically ill patients. A quasi experimental research(non equivalent control group pretest-posttest design) was used in this study. The subjects were 30 non insulin dependent diabetic patients(experimental group : 14 patients, control group : 16 patients). The study was carried out from May, 1995 to February, 1996. Data were collected before the education program, immediately after ＆ 2 menths later and were analyzed with repeated measure ANCOVA, paired t-test and t-test. The results are as follows : 1. There was a significant difference in self efficacy between the two groups（F＝27.61, P＝0.000）. There was a significant difference according to experimental stages（F＝33.09, P＝0.000） and interaction between education and experimental stages（F＝30.21, P＝0.000）. 2. There was a significant difference in self care behavior between the two groups（F＝27.05, P＝0. 000). There was a significant difference according to experimental stages（F＝31.14, P＝0.000） and interaction between education and experimental stages（F＝28.88, P＝0.000）. 3. There was a significant difference in glycemic control between before the education program and 2 months iater in the experimental group （t＝2.88, P＝0.013）. But there was no significant difference between before the education program and 2 months later in the control group. These results suggest that a self regulation education program is effective in promoting ＆ maintaining self care behavior and in improving glycemic control.. Thus this program can be recommended as an effective nursing intervention for chronically ill patients including diabetic patients.

• 임상간호연구
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• 제22권1호
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• pp.28-37
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• 2016

Purpose: This study was to investigate the relationships between among health literacy, knowledge and self-care behavior in elderly patients with heart failure(HF). Methods: 166 patients (age ${\geq}65$ years) with HF were recruited in a cardiovascular center of an university affiliated hospital. The structured questionnaire included Health literacy, Dutch Heart Failure Knowledge Scale, European Heart Failure Self-care Behavior, Self-Care of Heart Failure Index. Data were analyzed by descriptive statistics, Chi-test, Pearson correlation analysis, t-test and ANCOVA using SPSS/WIN version 21.0. Results: Participants with the high level of health literacy were more likely to be younger (p=.001), men (p=.001), with more education (p<.001), and have a job (p=.004), and with a higher economic status (p=.005). The positive correlations between the level of health literacy, knowledge, and self-care behavior were confirmed (p<.001). Participants with the high level of health literacy showed higher level of knowledge, more self-care behavior for health maintenance, and confidence. Conclusion: This study shows that the level of health literacy may influence knowledge and self-care behavior in elderly patients with HF. In order to improve self-care behaviors in elderly patients, a strategic nursing approach based on the level of patients' health literacy needs to be considered.

• 한국콘텐츠학회논문지
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• 제9권9호
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• pp.393-402
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• 2009

본 연구는 중년기남성의 운동변화단계에 따른 신체적 자기효능감과 우울 및 스트레스의 수준에 차이가 있는지를 검증하는데 목적이 있다. 연구대상은 서울에 거주하는 만 40세부터 50세의 남성으로 일용직, 사무직, 전문직 종사자를 대상으로 자료를 수집하여 최종 289부의 설문을 최종분석에 이용하였다. 자료처리는 SPSS 12.0을 사용하여 탐색적 요인분석, 신뢰도분석, 1-way ANOVA, 상관관계분석을 이용하여 결과를 도출하였다. 연구결과 첫째, 연구대상의 운동변화단계에 따라 신체적 자기효능감은 유의한 차이를 보였고 사후검증 결과 단계가 높아질수록 신체적 자기효능감이 높아지는 것으로 나타났다. 둘째, 연구대상의 운동변화단계에 따라 우울의 수준은 유의한 차이를 보였고 사후검증 결과 전반적으로 단계가 높아질수록 우울이 낮은 수준을 나타내는 것으로 나타났다. 셋째, 연구대상으로 운동변화에 따른 스트레스는 유의한 차이를 보였고 사후검증결과 준비단계가 유지단계보다, 계획전단계가 행동단계와 유지단계보다 낮은 스트레스 수준을 나타냈다. 넷째, 운동변화단계가 높아질수록 우울, 스트레스가 감소하고 신체적 자기효능감은 증가하는 경향을 나타냈다.