• Journal of Chest Surgery
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• 제13권4호
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• pp.338-345
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• 1980

We have modified an isolated perfusion rat heart model of cardiopulmonary bypass, with which we are able to screen the effects of various cardioplegic solutions and hypothermia upon the ability of the heart to survivie during and recover from period of ischemic arrest. The modified experimental model was differed from the original as follow : a heat coil chamber of atrial and aortic reservoir provided temperature control, and the perfusate was gassed with each pure oxygen and pure carbon dioxide in 95:5 ratio. The Langendorff perfusion was initiated for a 10 minute period by introducing perfusate at $37^{\circ}C.$ into the aorta from the aortic reservoir located 100 cm above the heart. The isolated perfused working rat heart model was a left heart preparation in which oxygenated perfusion medium (at $37^{\circ}C.$) entered the cannulated left atrium at a pressure of 20 cm $H_{2}O$ and was passed to the ventricle, from which it was sponeously elected(no electrical pacing) via an aortic cannula, against a hydrostatic pressure of 100cm $H_{2}O$. during this working period various indices of cardiac functin were measured. The cardiac functions were stable for over 3 hour with perfusion of Krebs-Henseleit bicarbonate buffer solution containing only glucose (11.1 mM/L). The percentage of cardiac functins were maintained about 94% on heart rate, 80.6% on peak aortic pressure, 87.7% on coronary flow and 76.3% on aortic flow rate after 3 hour of working heart perfusion at a pressure of 20 cm $H_{2}O$. We believe this preparation to be a good biochemical model for the human heart which offers many advantages including economic, speed of preparation, reproducibility, and the ability to handle large numbers.

• 가정과삶의질연구
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• 제34권2호
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• pp.65-83
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• 2016

The purpose of this study was to investigate the influences of variables related to family and employment on work-family negative spillover. The subjects of this study were 570 dual-earner with children. The research tool was questionnaires. For data analysis, factor analysis, Cronbach ${\alpha}$, and multiple regression were performed. The main results of this study were as following. First, among variables related to family, spouse support, parental satisfaction, marital satisfaction, perceived fairness in the division of household labor, daily housework hour and family strengths had an influence on $work{\rightarrow}family$ negative spillover in wives, and weekends housework hour, perceived fairness in the division of household labor, perception of the gender role, and satisfaction of the division in household labor had an influence on $work{\rightarrow}family$ negative spillover in husband. Second, among variables related to family, parental satisfaction, number of children influence on $family{\rightarrow}work$ negative spillover in wives, and spouse support, parental satisfaction, satisfaction of the division in household labor, marital satisfaction, and perception of the gender role had an influence on $family{\rightarrow}work$ negative spillover in husband. Third, among variables related to employment, support from workplace, weekly working hour, monthly income, and job satisfaction had an influence on $work{\rightarrow}family$ negative spillover in wives, and support from workplace, monthly income, household income, and weekly working hour had an influence on $work{\rightarrow}family$ negative spillover in husband. Forth, among variables related to employment, support from workplace in wives, and job satisfaction in husband had an influence on $family{\rightarrow}work$ negative spillover. To conclude, there was some difference in the variables influencing $work{\rightarrow}family$, $family{\rightarrow}work$ negative spillover between wife and husband. So, We have to take this difference into consideration in establishing work-family life balance policies.

• 한국산업융합학회 논문집
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• 제23권4_2호
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• pp.593-601
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• 2020

This study was conducted to analyze the physical strain with heart rate monitor in timber harvesting operations in order to reduce occupational accidents. The timber harvesting activities are manual cutting(felling, limbing and bucking) with a chainsaw and extraction by cable yarder. The study took place on Japanese larch stand. The average height was 26m and average diameter at breast height(DBH) was 3 7cm. The havest unit was gentle slope to steep slope. Results showed that the heart rate increases for chocking, felling, limbing and bucking were 94.0%, 87.9%, 84.8% and 56.4% respectively. The rate of Work Load Index was higher in the limbing(61.4%) activity than other activities chocking(55.2%), felling(54.1%) and bucking(32.1%). During 50% working heart rate test it was found that limbing(1.09), chocking(1.05) and felling(1.04) was exposed to high work intensity compared to bucking(0.83). The results showed that maximum acceptable work times(felling, chocking and limbing) were 2.30 hour, 1.85 hour and 1.60 hour respectively. To avoid occupational accidents, timber harvest workers may use a suitable working hour schedule to felling, chocking, limbing.

• Annals of Surgical Treatment and Research
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• 제95권5호
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• pp.233-239
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• 2018

Purpose: In Korea, the working-hour limitation regulation has been implemented in December 2017. We aimed to define the difference in operative experience of surgical residents before and after implementing this policy in 2 hospitals among 8 affiliated hospitals of the Catholic Medical Center where implemented the 80 working-hour limitation policy since March 2015. Methods: All the operation records were reviewed, and the number of resident-participated surgeries between March and August in 2002 and 2017 were compared. Operations performed or participated in by residents as first assistants were defined as resident participated surgery. Results: After 2 years from the initiation of the resident work-hour limitations, the number of resident participated surgery has slightly decreased in both hospitals (Yeouido St. Mary's Hospital [YSM]: 317 to 302, St. Paul Hospital [SPH]: 635 to 461). For each resident, changes were like followings: $0{\rightarrow}21$ cases for R1, $65{\rightarrow}72$ cases for R2, $83{\rightarrow}192$ cases for R3, and $169{\rightarrow}17$ cases for R4 in YSM. In SPH, number of resident participating surgery was changed like followings: $4{\rightarrow}32$ cases for R1, $222{\rightarrow}100$ cases for R2, $317{\rightarrow}300$ cases for R3, and $92{\rightarrow}29$ cases for R4. In both hospital, while, total number of resident participating oncologic surgery has been decreased, number of resident participating appendectomy has been far increased. Activity of each grade resident is different according to hospital. Conclusion: Although total number of resident participating surgery decreased, variable changes were observed in each grade of resident according to each type of surgery and different hospitals. It is believed that comparisons of experiences from more hospitals in the future would be helpful in establishing the guidelines for surgical experience requirement of residents in Korea.

• 한국치위생학회지
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• 제15권3호
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• pp.539-546
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• 2015

Objectives: The purpose of the study is to investigate the impact of working environment on the subjective health symptoms in the dental hygienists. Methods: The subjects were 220 dental hygienists in Gwangju and Jeonnam. A self-reported questionnaire was completed from September 9 to 22, 2012. The questionnaire was adapted and modified from building symptom index of workers in large buildings by O. The questionnaire consisted of eight questions of the general characteristics of the subjects, 19 questions of working environment and job satisfaction, nine questions of working environment characteristics, and six questions of subjective health symptoms. The questionnaire was measured by Likert 4 scale. Cronbach's alpha in this study was 0.826. Except incomplete answers, 192 data were analyzed using SPSS 19.0 program including t-test, ANOVA, and multiple regression. Results: The health symptoms were statistically and significantly different in glasses wearer and contact lens wearer, working hour satisfaction, and indoor environment(p<0.05). The subjective health symptoms were statistically different from the salary satisfaction, human relations satisfaction, office air environment, indoor environmental awareness score(p<0.05). Conclusions: It is necessary to improve the pleasant indoor working environment by providing the efficient working environment for the health care providers.

• 산업노동연구
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• 제17권1호
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• pp.37-70
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• 2011

통계청의 '경제활동인구조사 부가조사'(2010년 3월)와 문화체육관광부 통계청의 '국민여가활동조사'(2010년 7월)를 분석한 결과, 주40시간 근무제가 노동자들의 근로시간과 여가생활에 미치는 영향은 다음과 같다. 첫째, 주40시간 근무제는 실 근로시간을 11.3% 단축시키고, 장시간근로 확률을 1/5로 축소시킨다. 시간당 임금에 대한 근로시간 탄력성은 -0.145로, 임금이 낮을수록 실 근로시간이 길고 장시간근로 확률이 높다. 저임금과 장시간근로는 동전의 양면이다. 둘째, 주40시간 근무제는 휴일 여가시간을 매개변수로 하여 여가비용에 영향을 미친다. 휴일 여가시간이 10% 늘면 여가비용이 3% 늘어난다. 주40시간 근무제는 스포츠 등 적극적 여가활동을 늘리고, 자원봉사, 동호회 등 사회성 여가활동에 긍정적 영향을 미치고 있다. 셋째, 주40시간 근무제 이후 생활에서 나타난 가장 큰 변화로는, 10명 중 7명이 '가족과 함께 하는 여가시간 증가'(52.2%), '자기 계발을 위한 시간 증가'(15.7%) 등 긍정적 변화에 응답하고, '여가 소비지출 부담 증가'(6.3%), '수입 감소'(3.4%) 등 부정적 변화는 13.9%, '별다른 변화 없음'은 14.4% 응답했다. 긍정적 생활변화는 여가생활 만족도 증가로 이어지고 있다. 넷째, 다른 변수를 통제하더라도 주40시간 근무제는 주관적 행복수준에 직접 영향을 미칠 뿐만 아니라, 여가생활 만족도를 매개변수로 하여 간접적으로도 영향을 미치고 있다. 따라서 주40시간 근무제가 노동생활과 여가생활에 미친 영향이 긍정적이라는 사실을 분명히 인식하고, 빠른 시일 내에 모든 직장에 주40시간 근무제가 정착되도록 가능한 모든 노력을 기울여야 한다. 주40시간 근무제를 5인 미만 사업장으로 확대하고, 초중등학교에 주5일 수업제를 전면 실시하고, 적극적 여가활동 여건을 조성해야 한다. 근로감독 행정을 강화해서 주 52시간을 초과하는 탈법적인 장시간근로를 제한하고 저임금을 일소해야 한다.

• 대한안전경영과학회지
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• 제16권3호
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• pp.257-266
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• 2014

This study was planned to investigate the effect of the exposure to hazard factors on work environment satisfaction. Existing researches about job satisfaction have focused on the general working conditions, such as working hours, wage, human relationship, job task and so on. Korean Working Conditions Survey was used for this study because that relevant questions were included. The effect of the exposure to hazard factors on work environment satisfaction may be produced by hierarchical regression analysis because of comparison with existing model for work environment satisfaction. The exposure to hazards factors were statistically significant effect on work environment satisfaction after adjusting other confounding variables, such as gender, age, educational level, job security, work hour, work load, work autonomy, social support, etc. This study has some limitation because that KWCS was cross sectional survey. Some researches about the causal effect and its mechanism may be suggested as future study.

• 대한가정학회지
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• 제48권7호
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• pp.111-118
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• 2010

This study investigated working mothers' attitudes toward maternal employment and beliefs regarding childcare quality according to the childcare centers' operating modalities and hours. Participants were 261 mothers sending their children to full day, nighttime, or 24-hour childcare centers. We conducted the data analysis two-way ANOVA using SPSS. The results revealed significant differences among the groups in these working mothers' attitudes toward maternal employment and their beliefs regarding childcare quality and childcare centers' operating modalities and hours.

• 대한안전경영과학회지
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• 제19권4호
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• pp.253-260
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• 2017

Due to dramatic changes in the trend of corporate management in economics, labor and government, companies are being asked to adapt creative and innovative organizational culture in order to keep sustainability. Under the circumstances, flexible working hour becomes one of very effective method for organization culture improvement. Recently, M company has introduced the new policy of working hours that employees can choose a couple of different time options depending on their personal situations. And it turns out to be very effective to work & life balance, increasing organizational vitality, improving efficiency of business and productivity, recruitment of core human resources, and prevention of deviation; both team and personal performance levels has significantly improved. Therefore, it is highly recommended to adapt flexible working policies for companies seeking for a long term, sustainable corporate vision.

• 가족자원경영과 정책
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• 제17권4호
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• pp.19-37
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• 2013

From the perspective of labor welfare, forty-hour-a-week working system:(FWS) has been an important goal throughout world, and in fact, advanced countries implemented this a long time ago. However, there are differences in opinions concerning FWS; some people emphasizes the improvement in life quality, while others point out that this measure increases the cost of wages and has limited effectiveness. Thus, discussions about the success of FWS have emerged from diverse perspectives; One thing that should be made clear before debating FWS is that reducing laborers' working hours is already a global trend, and Korea, also intends to extend it. Therefore, in order to maximize the benefits resulting from the execution of the system and to identify measures that can be used to solve the problems related to FWS, it is necessary to consider actual laborers' use of leisure resources and whether they have increased or decreased as a result of FWS. It is also necessary to look at the differences in workers' leisure activity with and without the system. To evaluate and diagnose FWS's political effect from the perspective of laborers' leisure satisfaction and improvements in life quality, this study examines differences in leisure expenses, leisure hours, use of and demand for leisure resources such as leisure space, and types of leisure activity, according to the execution of FWS, This research is based on the "2012 Survey on National Leisure Activity" conducted by the Ministry of Culture, Sports and Tourism. In addition, through analysis of the differences in leisure satisfaction and happiness levels, the study intends to confirm the necessity of executing FWS and ensuring that the system is in use. The study results can be briefly summed up as followa:: First, regarding the general findings of the study, a significant result was shown in terms of the execution of FWS according to income level. The finding that the execution of FWS works differently according to the working environment or life quality reassures us of the common notion in society that working environment or life quality may differ in relation to social characteristics. The utility of weekday leisure hours did not indicate a statistically significant difference, but in terms of weekend leisure hours, laborers practicing FWS had an additional 30 minutes of leisure time than those who did not. Furthermore, regarding leisure expenses, laborers practicing FWS indicated more monthly average leisure expenses or expected leisure expenses. In relation to leisure activity, those working at a company executing FWS engaged in culture and art activities more frequently than those working at the companies that did not. On the other hand, those working at companies without FWS indicated more hobbies, amusement activities, rest, and other activities than those working at the companies with FWS. In terms of vacation experience, those working at companies with FWS had more vacation time than those working at companies without it; on average, they had longer vacations by 1.64 days. Regarding their leisure life satisfaction and happiness level, those working at companies with FWS indicated higher satisfaction and greater happiness than those working at companies without it. The findings mentioned above represent the preliminary results of this paper, and the remainder of the research will provide more detailed analysis results and suggestions corresponding to them.