• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2003년도 Challenges and Achievements in Environmental Health
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• pp.213-216
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• 2003

This study was conducted to estimate if the level of several chemical ingredients including alkanolamines or ethanolamines (EA) examined in the specific synthetic metalworking fluid (MWF) “A” can cause anti-microbial activity and health effect. Three water-based MWF products (“A”, “B”, and “C”) were studied every week for two months (from June 1, 2002 to July 30, 2002). Chemical ingredients such as formaldehyde, boron, EA, and copper were examined. In the sump where MWF “A” was used, not only the total level of EA, monoethanolamine(MEA), diethanolamine(DEA) and triethanolamine(TEA), but also boron level were significantly higher than those of the other MWFs. ANOVA statistical tests indicated that levels of pH, alkalinity, boron, MEA, DEA and TEA in MWF A were significantly higher than those in other MWF types. Correlation tests also found that levels of pH, alkalinity, boron, MEA, DEA and TEA in MWF “A” are significantly correlated. We suggested the assumptions that excessive concentrations of EA, and borate at a high pH level, may cause anti-microbial resistance synergically, To demonstrate this assumption, additional study is needed to examine the relationship between the levels of microbes and excessive concentrations of EA, and borate at a high pH level.

• KSTLE International Journal
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• 제4권2호
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• pp.52-55
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• 2003

This study was conducted to estimate if the level of several chemical ingredients including alkanolamines or ethanolamines (EA) examined in the specific synthetic metalworking fluid (MWF) "A" can cause anti-microbial activity and health effect. Three water-based MWF products ("A", "B", and "C") were studied every week for two months (from June 1, 2002 to July 30, 2002). Chemical ingredients such as formaldehyde, boron, EA, and copper were examined. In the sump where MWF "A" was used, not only the total level of EA, monoethanolamine(MEA), diethanolamine(DEA) and triethanolamine(TEA), but also boron level were significantly higher than those of the other MWFs. ANOVA statistical tests indicated that levels of pH, alkalinity, boron, MEA, DEA and TEA in MWF "A" were significantly higher than those in other MWF types. Correlation tests also found that levels of pH, alkalinity, boron, MEA, DEA and TEA in MWF "A" are significantly correlated. We suggested the assumptions that excessive concentrations of EA, and borate at a high pH level, may cause anti-microbial resistance synergically. To demonstrate this assumption, additional study is needed to examine the relationship between the levels of microbes and excessive concentrations of EA, and borate at a high pH level.

• 기독교교육논총
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• 제64권
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• pp.173-202
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• 2020

본 연구는 교회 가정사역 프로그램 참여자의 학습참여동기가 서번트 리더십에 미치는 영향과 공동체 의식의 구조적 관계를 탐색하기 위해서 수행되었다. 먼저 선행연구 분석을 통해 구조모형을 구성하였다. 구조모형 검증을 위해 전국의 교회 및 단체에서 실시하는 교회 가정사역에 프로그램에 참여하고 있는 부부를 대상으로 배포한 설문지 700부 중 607부를 대상 자료로 수집하였다. 자료수집은 교회 가정사역 이후 학습참여동기, 서번트 리더십, 공동체 의식을 설문지를 사용하여 수집하였다. 수집된 자료는 구조방정식 모형 분석 방법을 사용하여 학습참여동기에 대한 서번트 리더십의 영향과 공동체 의식의의 구조적 관계에 대해 분석하였다. 그 결과 본 연구에서 제안한 구조적 모형이 타당한 것으로 검증되었다. 이에 학습참여 동기 가운데 내재적 동기와 외재적 동기의 영향을 공동체 의식이 매개하여 서번트 리더십에 영향을 주는 것으로 검증되었으며, 서번트 리더십의 영향을 공동체 의식이 매개하는 경로가 영향력을 가지고 있는 것으로 검증되었다. 이에 교회 가정사역을 운영할 때, 참여자들의 내재적 참여동기와 외재적 참여동기를 고려하여 공동체 의식을 조절한다면 학습참여동기의 수준을 조절할 수 있다는 시사점을 제시할 수 있다.

• 한국도서관정보학회지
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• 제36권3호
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• pp.5-20
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• 2005

부산시내 21개 공공도서관에 재직하고 있는 132명의 사서들을 대상으로 변혁적 리더십과 거래적 리더십을 구성하는 하위 요인들이 스트레스 증세에 미치는 영향을 밝혀보고자 하였다. 분석결과는 1) 스트레스 증세와 근무년수와는 관련성이 없으며 사서들의 스트레스 수준은 매우 높은 편이었다. 2) 변혁적 리퍼십의 카리스마와 개별적 배려는 스트레스 증세에 부(-)의 영향을 미치는 것으로 나타났다. 3) 거래적 리더십의 예외에 의한 관리는 스트레스 증세와 정(+)의 관계를, 조건적 보상은 부(-)의 관계로 나타났다. 4) 거래적 리더십보다는 변혁적 리더십이 스트레스에 미치는 영향이 더 크게 나타났다. 결론은 변혁적 리더십의 카리스마와 개별적 배려는 스트레스를 감소시켜 주는 변수이고 거래적 리더십의 예외에 의한 관리는 스트레스를 증가시키는 변수임을 확인하였다.

• The Journal of Asian Finance, Economics and Business
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• 제8권1호
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• pp.113-122
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• 2021

This study aims to investigate the effects of fiscal policy instruments on economic growth in Jordan using annual data from 1970 to 2019, by applying the VAR model (Vector Auto regression) and the Vector Error Correction Model (VECM). The study also examines the dynamic relationship among economic variables over time using the Granger casualty test, Impulse Response Function, and Variance Decomposition. The results show that not only the public expenditures have a positive effect on economic growth in Jordan, but also the tax revenues positively affect the economic growth in the short-run, and this is because of using the tax revenues to finance the government activities in Jordan. This effect becomes negative in the long run, and this is explained because the tax seems a source of distortions in the economy, The extreme taxes may cause huge distortions in the economy, and these distortions destroys the purchasing power, the aggregate demand, and supply. More governmental dependence on tax revenues is the main source of tax evasion and less efficiency. The effect of taxation will curb any prosperity in the economy. Therefore, the government should estimate the fair tax rates to generate sufficient revenues to finance the public expenditure required to enhance economic prosperity.

• 한국시스템다이내믹스연구
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• 제14권2호
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• pp.31-53
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• 2013

This article deals with a Causal-Loop analysis of the characteristics of Ouroboros effects. The meaning of the effects is that solutions to problems are usually intended as final fixes, but more often than not, while solving one problem, they generate more problems. It means 'to worsen through attempts to make better.' The Ouroboros effects are very dangerous because they are regarded as a kind of self-destructive mechanisms. While existing researchers recognize the risks of the effects, they are not able to solve the systematic problem but only to describe the symptom. Such a way to deal with the effects results in difficulty to clarify the cause-and-effect relationship within the system. Thus the authors are focusing on explaining the effects by SD (System Dynamics), which are considered as the sole methodology to do effectively so far since SD is a great tool to discover structural causes. To solve the self-destructive problem of the effects, the authors analyze the characteristics of several cases of the effects in elaborating the CLD (Causal Loop Diagram) for each case. The analysis reveals the structural characteristics of the effects and how to correct them towards maintaining the sustainability of systems.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.34-36
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• 2006

In this paper, we will treat the diagnosis problem to accurately determine fault types. The judgement of fault types is accomplished by observing the cluster newly formed with faults and clustering the input current waveforms to intrinsically show the conditions with the dignet that is a clustering algorithm. The types of input current waveforms are, however, constrained during normal operation, though it considers the load character. In case of faults. new clusters are generated outside the clusters. which appear during normal operation, because the input current waveforms of the induction motor are generated by the type which is not observed in case of faults. The diagnosis about the types of faults is essential to building a fault tree about the induction motor, and it removes the causes of the faults using a fuzzy logic. We, first, constitute a fault tree, which connects with the parts and the entire system of the induction motor, and investigate fault modes which can be generated from the fault tree and the relationship of the cause and the effect of each part (of the motor). Also, we distinguish the faults of each part by means of inducing the said of fuzzy relation equations encapsulating the relationship of the fault modes and each part.

• 융합정보논문지
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• 제9권10호
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• pp.203-212
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• 2019

본 연구는 학생조종사의 스트레스 요인이 정신건강에 미치는 영향을 파악하며, 스트레스 대처방식과 사회적 지지의 심리적 완충 역할의 확인을 통해 안전하고 효율적인 비행교육과 심리적 부조화를 감소시키고자 하였다. 연구목적을 달성하기 위해 선행연구를 근거로 하여 연구모형과 가설을 제시하였으며, 202명의 학생조종사를 대상으로 한 설문을 통해 회귀분석과 매개효과 검증을 실시하였다. 분석결과, 비행 스트레스, 가치관 스트레스, 교수관계 스트레스, 친구관계 스트레스의 요인이 정서상태 혹은 심리적 안녕감에 영향이 있는 것으로 나타났으며, 매개변수인 비관여 대처, 가족/지인 지지, 학교조직 지지가 학생조종사 스트레스와 심리적 건강의 요인에 매개효과가 있음을 파악하였다. 따라서, 학생조종사의 비행훈련, 가치관 혼란, 교수관계, 친구관계로 발생될 수 있는 문제와 부정적 감정을 잘 관리해야 할 필요성이 있으며, 가족과 지인의 감정적 지원과 비행과 관련된 훈련, 안전에 관한 학교의 지원이 주요한 사항임을 제안하였다.

• 한국경영과학회지
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• 제30권1호
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• pp.105-128
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• 2005

The Purpose of the current study is to identify the differences between Samsung and Hyundai Group and the causes why the differences occurred. The study focuses on the founders of the two group as a main source of the differences, especially brain preference of the two founders. Two steps were employed to perform the study. Firstly, the two founders' characteristics were analyzed by using archival research. It was implicitly hypothesized that Group founders' characteristics explained the differences of the two Groups. It was found that the founder of Samsung Group, the late president Lee emphasized rationality, analysis, and cause/effect relationship and low risk taking, suggesting that he had left-brain preference. In contrast. the late president Chung, the founder of Hyundai Group, emphasized intuition, wholeness, contextual meaning, and risk taking, showing that he had right-brain preference. Secondly, a comparison between the two groups was performed in terms of business and financial risk in corporate portfolio, and management system. It was found that Hyundai Group was pursuing higher risk than Samsung Group. And it was observed that Samsung Group put more emphasis on formality in decision making and systematic control, and less emphasis on risk taking than Hyundai Group. From the two step research relationship between brian preference and management was reasoned. Research implications and limitations were discussed at the end of the study.

• Journal of Microbiology and Biotechnology
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• 제29권7호
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• pp.1053-1060
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• 2019

Thermal drying is a common process used in the food industry for the modification of agricultural products. However, while various studies have investigated the alteration in physiochemical properties and chemical composition after drying, research focusing on the relationship between different dehydration conditions and bioactivity is scarce. In the current study, we prepared dried ginger under nine different conditions by varying the processing time and temperature and compared their immunomodulatory effects. Interestingly, depending on the drying condition, there were significant differences in the immunestimulating activity of the dried ginger samples. Gingers processed at $50^{\circ}C$ 1h displayed the strongest activation of macrophages measured by $TNF-{\alpha}$ and IL-6 levels, whereas, freezedried or $70^{\circ}C$- and $90^{\circ}C$-dried ginger showed little effect. Similar results were recapitulated in primary bone marrow-derived macrophages, further confirming that different dehydration conditions can cause significant differences in the immune-stimulating activity of ginger. Induction of ERK, p38, and JNK signaling was found to be the major underlying molecular mechanism responsible for the immunomodulatory effect of ginger. These results highlight the potential to improve the bioactivity of functional foods by selectively controlling processing conditions.