• 한국간호교육학회지
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• 제24권1호
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• pp.89-99
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• 2018

Purpose: The purpose of this study was to identify the influence of professional self-concept, job overload, and perceived organizational support on job involvement in clinical nurses. Methods: The participants in this study were 232 nurses who were working in five general hospitals in city D. Data was collected using self-reported questionnaires from August 16 to September 15, 2016. The data was analyzed using the IBM SPSS 19.0 program. Results: Job involvement of clinical nurses was influenced by professional self-concept, perceived organizational support, turnover intention, age, and monthly income. These variables explained 47.6% of job involvement of clinical nurses, and professional self-concept was the most significant factor in job involvement. Conclusion: The findings indicate that the job involvement of clinical nurses is influenced by professional self-concept and perceived organizational support. Consequently, it is necessary to increase professional self-concept and perceived organizational support for nurses' job involvement.

• 동아시아식생활학회지
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• 제17권1호
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• pp.143-151
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• 2007

The effects of job stress factors on psychological job stress and job satisfaction levels of school dietitians were evaluated. Questionnaires were distributed to 163 elementary school foodservice dietitians in the Seoul and Incheon area. Statistical data analysis was completed using the SPSS program. The highest stress factor was the importance of the job followed by role ambiguity, autonomy and identity, communication and participation. When dealing with job stress, the subjects showed improved and positive behaviors when communicating and participating with each other. The analysis of the relationships between job stress factors and job satisfaction revealed that the importance of the job had a negative effect on jog satisfaction. while role conflict and overload, personal relationships, and experience accumulation had positive effects. Ample occupational experience and background had highly positive effects on school dietitians' job satisfaction level whereas negative results were shown concerning circulated appointments(p<0.01). Based on these results, we suggest that role conflict and overload should be reduced in order to lower job stress levels and enhance job satisfaction levels.

• Human Ecology Research
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• 제59권3호
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• pp.297-310
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• 2021

This study examined the social wellbeing of working mothers of preschool children with the aim of identifying relationships between social wellbeing and influencing factors, focusing on the individual, relationship, and work environment of the mothers. Data on 390 working mothers were used for this study. The data were analyzed using the SPSS 18.0 program and descriptive statistics. Pearson's correlation analyses and hierarchical regression analyses were performed. The results show that social wellbeing has significantly positive correlations with education, monthly household income, number of children, age of the first child(8 and over), social capital for childcare, division of childcare, maternal role values, spouse's beliefs about paternal parenting involvement, and family-supportive work environment, as well as significantly negative correlations with weekly working hours, sociological ambivalence, spouse's beliefs about father's breadwinner role and gender-role values, job overload, and gender-role attitudes of coworkers. In addition, hierarchical regression revealed that spouse's beliefs about paternal parenting involvement and a family-supportive work environment were significantly positive predictors of working mothers'social wellbeing, whereas working mothers'sociological ambivalence toward their roles, job overload, and gender-role attitudes of coworkers were significantly negative predictors of working mothers'social wellbeing. These results point to ways of changing education and policy to improve the social wellbeing of working mothers.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 1997년도 춘계학술강연 및 발표대회 강연 및 발표논문 초록집
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• pp.34-34
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• 1997

The effect of alloying mode and porosity on the axial tension-tension fatigue behavior of a P/M steel of nominal composition Fe-4w/o Ni-1.5w/o Cu-O.5w/o Mo-O.5w/o C has been evaluated. Alloying modes utilized were elemental powder mixing, partial alloying(distaloy) and prealloying by water atomization; in each case the carbon was introduced as graphite prior to sintering. Powder compacts were sintered($1120{\circ}C$/30 min.) in 7Sv/o $H_2$/25v/o $N_2$ to densities in the range 6.77-7.2 g/$cm^3$. The dependence of fatigue limit response on alloying mode and porosity was interpreted in terms of the constituent phases and the pore and fracture morphologies associated with the three alloying modes. For the same nominal composition, the three alloying modes resulted in different sintered microstructures. In the elemental mix alloy and the distaloy, the major constituent was coarse and fine pearlite, with regions of Ni-rich ferrite, Ni-rich martensite and Ni-rich areas. In contrast, the prealloy consisted primarily of martensite by with some Ni-rich areas. From an examination of the fracture surfaces following fatigue testing it was concluded that essentially all of the fracture surfaces exhibited dimpled rupture, characteristic of tensile overload. Thus, the extent of growth of any fatigue cracks prior to overload was small. The stress amplitude for the three alloying modes at 2x$l0^6$ was used for the comparison of fatigue strengths. For load cycles <3x$l0^5$, the prealloy exhibited optimum fatigue response followed by the distaloy and elemental mix alloy, respectively. At load cycles >2x$l0^6$, similar fatigue limits were exhibited by the three alloys. It was concluded that fatigue cracks propagate primarily through pores, rather than through the constituent phases of the microstructure. A decrease in pore SIze improved the S-N behavior of the sintered steel.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1997년도 추계학술대회 논문집
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• pp.120-126
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• 1997

This paper examines the crack growth behavior of 7075-T651 aluminum alloy under high-low block loading condition. The cantilever beam type specimen with a chevron notch is used in this study. The crack growth and closure are investgated by compliance method. The applied initial stress ratios are R=-0.5, R=0.0 and R=0.25 Crack length($\alpha$), effective stress intensity factor range(ΔKeff), ratio of effective stress intensity factor range(U) and crack growth rate(d$\alpha$/dN) etc. are inspected fracture mechanics estimate.

• 서비스연구
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• 제13권4호
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• pp.1-23
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• 2023

현재 태블릿 PC 가 점점 더 인기를 끌면서 매장 운영에 있어 편리함을 제공하지만, 일부 고객은 불만을 느낄 수 있다. 그림자노동의 관점에서 고객은 태블릿 PC 를 사용하는 것이 추가 작업, 즉 서비스 직원으로부터 업무가 이전되어 고객 스스로 작업을 해야 한다고 느낄 수 있다. 따라서 본 연구는 고객이 태블릿 PC 를 이용할 때 그림자노동에 대한 인식(지각된 사용 어려움 및 지각된 사용 강제성)의 원인과 그림자노동에 대한 인식이 태블릿PC 주문 서비스에 대한 재사용 의도에 어떤 영향을 미칠 수 있는지를 조사하는 것을 목적으로 한다. 또한 고객의 그림자노동에 대한 지각이 디지털 리터러시와 정보 과부하에 영향을 받는지 여부를 조사하며, 태블릿 PC 를 사용할 때 발생하는 혜택이 그림자노동 지각에 미치는 긍정적인 영향을 조사한다. 본 연구는 음식점에서 태블릿 PC 를 이용하여 주문하는 고객을 대상으로 중국의 설문조사 전문 사이트인 "원쥬엔싱" (Wenjuanxing)를 통해 온라인 설문조사를 수행한 후, 총 376 개의 유효한 데이터에 대해 SPSS 24.0 을 활용하여 인구통계학적 특성, 빈도 분석, 신뢰도 분석, 타당성 분석, 상관관계 분석 등을 실시했다. 또한 가설들은 회귀분석을 통해 검증하였다. 376 명 응답자의 실증분석 결과, 디지털 리터러시와 정보 과부하가 그림자노동 인식에 영향을 미치며, 태블릿 PC 주문 서비스 재사용 의도에도 영향을 미친다는 점을 밝혔다. 또한 혜택은 이러한 관계에 대해 유의한 조절 효과를 보였다.

• 한국콘텐츠학회논문지
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• 제20권6호
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• pp.197-210
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• 2020

학습민첩성은 새로운 환경과 경험 속에서 빨리 학습하여 생각과 행동을 유연하게 변화시키는 의지와 능력이고, 위기를 극복하고 조직의 문제를 해결하는 핵심역량이며, 언제든지 개발 가능하기 때문에, 군(軍)과 같은 조직 집단에서 활용할 수 있는 개념이다. 선행연구를 토대로 육군 간부의 직무특성과 개인학습민첩성이 학습만족도에 어떤 영향을 미치는지 연구를 진행하였다. 상·원사 216명을 대상으로 설문을 받아 SPSS 24.0을 이용하여 측정변인에 대한 신뢰도과 타당도를 검증하고, 가설에 대해 회귀분석으로 검증한 결과, 직무특성 하위항목 일부(업무과부하)가 부적인 영향을 미치며, 개인 학습민첩성 하위항목 일부(자기인식, 적극적 변화추구)는 학습만족도에 정적인 영향을 미치는 것으로 나타났다. 이는 군 사이버교육의 효과를 증진하기 위해서는 야전에서 업무가 과부하되지 않도록 조치하고, 군 조직에서 성과를 높이기 위해서는 자기인식 및 피드백을 바탕으로 적극적인 변화를 추구하는 개인 학습민첩성을 개발해야 함을 의미한다.

• 대한수의학회지
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• 제39권4호
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• pp.679-688
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• 1999

The combined effects of iron and selenium status on glutathione peroxidase (GSHPx) activity, cytochrome P-450 activity, and lipid peroxidation in the liver and intestinal mucosa of rats were investigated. In experiment one, four experimental groups (+Se+Fe, -Se+Fe, +Se++Fe, -Se++Fe) were manipulated for 3 weeks with intramuscular administration of irondextran (++Fe) and/or normal diet (+Fe) and deionized water (-Se) and/or selenium-supplemented deionized water (+Se). In experiment two, 2% dietary carbonyl iron (instead of the parenteral administration) was fed for 3 weeks to rats. Body weight of rats was significantly decreased in both parenterally and orally iron-overloaded groups (p<0.01), regardless of Se supplement. Serum iron was significantly increased in parenterally iron-overloaded groups but it was marginally increased in orally iron-overloaded groups. There was no significant difference in hemoglobin content among experimental groups in either experiment one or two. Total iron in the small intestine, intestinal mucosa, and livers was significantly high in both parenterally and orally iron-overloaded rats, regardless of selenium status. In the liver and intestine, GSHPx activity was significantly higher in all selenium-supplemented groups, compared to Se-deficient groups (p<0.01) and lipid peroxidation was significantly enhanced in both parenterally and orally iron-overloaded groups, compared to iron-adequate groups. There was no significant difference in cytochrome P-450 activity in the livers between groups in both experiment one and two. These results indicated that GSHPx activity in liver and intestinal mucosa was depended on selenium status, regardless of iron status, and iron-overload enhances lipid peroxidation in liver and intestinal mucosa by increasing the tissue iron content.

• Toxicological Research
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• 제30권4호
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• pp.267-276
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• 2014

Exposures to lead (Pb) are associated with neurological problems including psychiatric disorders and impaired learning and memory. Pb can be absorbed by iron transporters, which are up-regulated in hereditary hemochromatosis, an iron overload disorder in which increased iron deposition in various parenchymal organs promote metal-induced oxidative damage. While dysfunction in HFE (High Fe) gene is the major cause of hemochromatosis, the transport and toxicity of Pb in Hfe-related hemochromatosis are largely unknown. To elucidate the relationship between HFE gene dysfunction and Pb absorption, H67D knock-in Hfe-mutant and wild-type mice were given drinking water containing Pb 1.6 mg/ml ad libitum for 6 weeks and examined for behavioral phenotypes using the nestlet-shredding and marble-burying tests. Latency to nestlet-shredding in Pb-treated wild-type mice was prolonged compared with non-exposed wild-types (p < 0.001), whereas Pb exposure did not alter shredding latency in Hfe-mutant mice. In the marble-burying test, Hfe-mutant mice showed an increased number of marbles buried compared with wild-type mice (p = 0.002), indicating more repetitive behavior upon Hfe mutation. Importantly, Pb-exposed wild-type mice buried more marbles than non-exposed wild-types, whereas the number of marbles buried by Hfe-mutant mice did not change whether or not exposed to Pb. These results suggest that Hfe mutation could normalize Pb-induced behavioral alteration. To explore the mechanism of repetitive behavior caused by Pb, western blot analysis was conducted for proteins involved in brain dopamine metabolism. The levels of tyrosine hydroxylase and dopamine transporter increased upon Pb exposure in both genotypes, whereas Hfe-mutant mice displayed down-regulation of the dopamine transporter and dopamine D1 receptor with D2 receptor elevated. Taken together, our data support the idea that both Pb exposure and Hfe mutation increase repetitive behavior in mice and further suggest that these behavioral changes could be associated with altered dopaminergic neurotransmission, providing a therapeutic basis for psychiatric disorders caused by Pb toxicity.

• 한국정보통신학회논문지
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• 제12권10호
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• pp.1866-1874
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• 2008

기존의 웹 서버는 과부하 상태인 경우 폐쇄 연결, 암호 핸드쉐이크 실행 증가와 서버 용량의 현저한 감소로 서버의 처리량에 문제가 발생하여 시스템의 전체적인 성능을 저하시킨다. 또한 쓰레드 블록으로 인하여 다수의 클라이언트 요청 처리가 원활하지 못하고, 쓰레드 활성화를 위하여 많은 시간과 자원을 요구하여, 클라이언트의 요청에 대해 접속시간과 응답 시간이 증가하는 단점이 발생한다. 그러므로 본 논문에서는 웹서버스의 장점인 통합과 커뮤니케이션 지원과 시스템 성능 향상을 위해 서버 과부하를 개선하고, 지연처리를 위해 필요한 기술을 제공하는 확장된 웹서버를 제안한다. 그리고 기존 시스템(Tomcat 5.5에서 구현)과 제안한 모바일 웹 서버 아키텍처를 평가한다. 확장된 서버 아키텍처는 시스템 성능을 위해 우수한 교환 조건을 제공하고, 다중쓰레드와 쓰레드풀을 결합한 개선된 웹 서버 아키텍처를 평가한다. 본 논문에서 제안된 웹서비스 아키텍처는 오리지널 Tomcat 5.5의 평가 결과보다 개선된 성능 이익의 결과를 얻었다.