• 한국신뢰성학회지:신뢰성응용연구
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• 제11권4호
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• pp.331-342
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• 2011

The transmission of tracked vehicles performs complex functions as steering, shifting, braking, etc. and the system level life time has been a key influenced by the number of sub-parts like as gear assembly, torque converter, clutches, bearings and so on. In particular, the mechanical type steering system in tracked vehicle has impact shock torques in steering shift and those kind of shock torques can effect on the durability of many sub-parts in power train system. The field failure modes of gear assembly, steering assembly and the bearings of output shaft appear as a very complex phenomenon. In this study, the actual failure, which may occur in field, of the transmission was investigated comprehensively and that the endurance test on the resulting output shaft bearing failure analysis and life assessment was performed. Life time test method used in this study, developed for the purpose of the internal usage, and under these testing techniques the impact of the each bearing damage, which used in tracked vehicle transmission left / right outputs of different structures, was analyzed.

• 대한가정학회지
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• 제34권5호
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• pp.49-66
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• 1996

The purpose of this study is to identify how the households invest in their children as a human capital. In addition, contributing factors to households' human capital investment was examined. The results of this study are as follows; First, Average number of children 2 children of surveyed housewives, full time housewives had more time spent for children than working counterparts. The former spent 6.8 hours a day with the latter 4.98 hour a day while both of them shared the most time in nonphysical care of their children. meanwhile, money paid for children was that full time housewife family spent 1,014,000 and a working housewife family paid 974,000. Second, In the full time housewives, total amount of time housewives spend for their children was greatly influenced by the income, the age of the youngest child, and emotional value. The housewives' educational level, life cycle, and an income were a significant impact on money investment. Total investment was influenced by the housewives' educational level, life cycle, income, and the number of children.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.459-464
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• 2004

The rifle impact of human body affected by the posture of human for rifling. The interaction human-rifle system influence the firing accuracy. In this paper, impact analysis of human model for shooting posture is carried out. ADAMS code and LifeMOD is used in impact analysis of human model and modeling of the human body, respectively. On the shooting, human model is affected by rifle impact during the 0.001 second. Performed simulation time for shooting is 0.1 second. Applied constraint condition to human-rifle system is rotating and spherical condition. As the results, the displacement of rifle and transfer path analysis of impact of human model is presented.

• 가족자원경영과 정책
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• 제19권3호
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• pp.81-99
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• 2015

This study investigates the balance between work and family, and the happiness of married working women who have preschool-aged children. Data were collected from 321 questionnaires that consisted of three parts: 1) basic demographic variables, 2) family-life variables, and 3) working-life variables. SPSS 21.0 was used for the statistical analysis. The variables that were identified to have a statistically significant impact on the balance between work and family were income, age of first child, time spent on housework and childcare on weekdays, time spent on housework on weekends, family-friendly service in the workplace and flexibility of work schedule. 2) The variables that were identified to have a statistically significant impact on happiness were age, income, time spent on housework on weekends, satisfaction with spouse's participation in housework and childcare, average working time, family-fiendly service in the workplace, flexibility of work schedule, and balance between work and family. The majority of the variables that influence balance between work and family, and happiness related to aspects of work, such as family-fiendly service, flexibility of work schedules, and average working time. The results also found that the load of housework and childcare on weekends is a heavy burden for working women. Further research needs to focus on developing the extending index of happiness including the measure of balance between work and life. In addition, further studies with more varied groups need to be conducted.

• BMB Reports
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• 제56권9호
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• pp.469-481
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• 2023

The gut microbiome is widely recognized as a dynamic organ with a profound influence on human physiology and pathology. Extensive epidemiological and longitudinal cohort studies have provided compelling evidence that disruptions in the early-life microbiome can have long-lasting health implications. Various factors before, during, and after birth contribute to shaping the composition and function of the neonatal and infant microbiome. While these alterations can be partially restored over time, metabolic phenotypes may persist, necessitating research to identify the critical period for early intervention to achieve phenotypic recovery beyond microbiome composition. In this review, we provide current understanding of changes in the gut microbiota throughout life and the various factors affecting these changes. Specifically, we highlight the profound impact of early-life gut microbiota disruption on the development of diseases later in life and discuss perspectives on efforts to recover from such disruptions.

• 산업경영시스템학회지
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• 제24권68호
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• pp.51-65
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• 2001

This study is to make LCIA(Life Cycle Impact Assessment) easier as a methodology of environmental scores(called E-score) that integrated environmental load of each emission substance based on environmental damage such as in human health, ecosystem and resources category. The concept is to analyzes the LCI(Life Cycle Inventory) and defines the level of environment damages for human health, ecosystem and resources to objective impact assessment standard, and makes the base of marginal damage to calculate the damage factor, which can present the indication that can establish the standard value of environmental impact. First, damages to human health are calculated by fate analysis, effect analysis and damage analysis to get the damage factor of health effect as a DALY(Disability Adjusted Life Years) unit. Second, damages to ecosystem are calculated by fate analysis, effect analysis and damage analysis to get the damage factor of the effect as a PDF(Potentially Disappeared Fraction) unit through linking potentially increased disappeared fraction. Third, damages to resources are carried out by resource analysis and damage analysis for linking the lower fate to surplus energy conception to get damage factor as a MJ(Mega Joule) unit. For the ranking of relative environment load level each other, LCIA can be carried out effectively by applying this E-score methodology to the particular emission substances. A case study has been introduced for the emission substances coming out of a tire manufacturer in Korea. It is to show how to work the methodology. Based on such study result, product-designers or producers now can apply the E-scores presented in this study to the substances of emission list, and then calculate the environment load of the product or process in advance at any time and can see the environment performance comparatively and expected to contribute to the environmental improvement in view of environmental pollution prevention.

• 한국콘텐츠학회논문지
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• 제21권12호
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• pp.264-274
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• 2021

본 연구의 목적은 웰빙관광만족도와 삶의 질사이에서 웰니스의 매개효과를 살펴보는 것이다. 웰빙관광이 삶의 질에 최근 웰빙관광이 증가하고 있음에도 불구하고 웰빙관광의 동기요인들을 통한 웰빙관광의 만족도가 삶의 질에 미치는 영향에 대한 연구 부족으로 인해 각 변인간의 영향 관계를 살펴보았다. 위와 같은 연구결과를 얻기 위하여 본 연구는 2021년 5월 10일부터 5월 21일까지 웰빙관광을 경험 해본 수도권 지역의 일반인 총 236명을 조사 대상으로 하였다. 연구결과는 다음과 같다. 첫째, 웰빙관광동기요인은 웰빙관광만족도에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 웰빙관광만족도는 삶의 질에 긍정적인 영향을 미치는 것으로 나타났다. 셋째, 웰니스는 웰빙관광만족도와 삶의 질 사이의 관계를 매개하는 것으로 나타났다. 본 연구의 시사점은 웰니스의 매개변수를 활용하여 웰빙관광이 삶의 질에 미치는 영향을 규명하는데 있다. 이를 통해 웰빙관광이 웰니스를 추구하는 웰빙관광객들에게 긍정적인 영향을 주어 삶의 질이 제고된다는 것을 확인하여 일상생활의 피로감이나 코로나 장기화로 인한 피로감을 해소하는데 웰빙관광이 효과적이라는 점을 밝혀냄으로서 웰빙관광 활성화에 기여하였다.

• 재활치료과학
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• 제9권3호
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• pp.91-102
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• 2020

목적 : 본 연구는 뇌졸중 환자를 대상으로 8주간 실시된 시간사용중재가 뇌졸중 환자의 생활만족도 및 자아존중감에 미치는 영향을 알아보았다. 연구방법 : 본 연구는 2019년 7월부터 10월까지 뇌졸중 환자 21명을 대상으로 실험군과 대조군으로 나누어 실시하였다. 생활만족도의 변화는 생활만족도 척도(Life satisfaction scale)를 사용하였고, 자아존중감의 변화는 자아존중감 척도(Self-esteem scale)를 사용하였다. 결과 : 첫째, 실험군과 대조군 각각 중재 전과 후를 비교한 결과, 생활만족도와 자아존중감 모두 통계학적으로 유의한 차이를 보였다(p<.05). 둘째, 중재 후 실험군과 대조군의 생활만족도와 자아존중감을 비교한 결과, 통계학적으로 두 집단 간 유의한 차이를 보였다(p<.05). 결론 : 본 연구의 결과 시간사용중재가 뇌졸중환자의 생활만족도와 자아존중감에 긍정적인 영향을 미쳤으며, 따라서 의미있는 작업 수행의 참여가 뇌졸중 환자의 정신건강과 생활의 질을 향상시킬 수 있을 것이다.

• 한국정밀공학회지
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• 제23권7호
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• pp.159-167
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• 2006

The impact time history of human body with K2 rifle on stand shooting posture is analyzed and compared with experimental results. Analysis model is Korean 50% tile of twenties and height, weight is 174 cm, 62 kgf respectively. The muscle and bone human model of Korean man's twenties 50% tile is applied. ADAMS program is used for kinematic analysis and human model is developed by Life Mod program. The effect of the ground support condition, grip position and human weight factor are studied. Maximum impact force of shoulder is 784 N. The horizontal displacement of K2 rifle muzzle is 2.9 cm.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.1033-1038
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• 2005

As a global effort to conservate the environment, life cycle assessment(LCA) which considers the environmental impact through the life cycle of a product, from acquiring of resources to scrapping, has been actively applied. The LCA is a tool to calculate quantitatively the environmental impacts caused by products or services through their life cycles. The list of numerous data should be analyzed, stored and conducted in order to assess the environmental impacts. Therefore, it is necessary to develop a software for LCA, which can perform the interpretation as well as the environment impact assessment to execute the analysis of such a large number of data effectively. At this time, for the existing some kinds of general LCA softwares, the information about all of input and output should be fed directly and the conclusion is deduced by linking to the database from the public authorized organizations. That makes it possible to evaluate the environmental grades accurately, but it is too slow and difficult for general users to operate and applied it into an electric motor unit(EMU). Therefore, in this research, the basic model was designed, which is based on construction of database structure of the software and organization of architecture, to develop an advanced software for EMU according to user and purpose of it by benchmarking of domestic and international softwares. The result of this study would be applied to develop the LCA software in the future.