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급속모래여과에서 PAC 피복에 의한 초기 유출수의 탁도 개선
윤태한 ( Tae Han Yoon ),김우항 ( Woo Hang Kim ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.3
The purpose of this research was to describe the mechanisms and prevention of initial degradation in turbidity of the sand filter effluent. The method used was by adding a coagulant (PAC) to the sand filter after backwashing as a means of reducing turbidity. It was found that adding 80 mg/L of PAC solution to the sand filter was very effective in improving the initial effluent turbidity. A turbidity removal efficiency of 99 % was observed in the initial term period as compared to a 70% efficiency without PAC addition. The PAC solution added to the sand filter resulted in high aluminum concentration at the upper layer as compared with the bottom layer of the sand filter column. A change in the zeta potential to a strong positive-ions at upper layer was observed at this time but only a small change was obtained at the bottom. This result showed that the zeta potential of the sand was changed to positive with PAC coating. The effect of pH on zeta potential with PAC addition was also investigated. Zeta potential was greatly changed to positive-ion at pH 4∼6. A series of experiments was then conducted in this study to optimize the pH of the PAC solution to be added to the sand filter after backwashing. The removal efficiency of turbidity was found to be highest at pH 5. This result suggested that hydrolyzed aluminium species attached to the surface of the sand enhanced the removal of turbidity of the effluent.
사업초기단계 중소기업의 무역지향성과 불확실성에 관한 실증연구
윤태한(Tae han Yoon),박동기(Dong gi Park) 한국국제상학회 2017 國際商學 Vol.32 No.3
본 연구는 새롭게 사업을 시장하는 사업초기단계 중소기업의 무역활동에 주목하고자 한다. 사업초기 단계부터 해외진출을 목적으로 한 중소기업의 경우 기존 내수 중심의 기업에 비하여 국가 경제에 건전한 영향을 미칠 수 있는 상당한 가능성을 가지고 있다. 그러나 이에 대한 세분화된 분석을 통한 관심과 지원이 필요함에도 불구하고 이들 중소기업이 창업 초기단계에 무역활동을 시작하고 지속함에 있어 대금결제 및 각종 금융활동에 상당한 어려움을 겪고 있는 실정이다. 따라서 본 연구를 통하여 사업초기단계 중소기업의 무역활동의 불안정성에 미치는 요인을 금융실무로 구체화하여 본질적인 차원에서 문제점을 찾고 실증분석을 통한 합리적 대안과 시사점을 제시하는데 목적을 가지고 있다. 본 연구의 실증분석결과는 다음과 같다. 사업초기단계 중소기업의 무역지향성은 무역거래 불확실성에 유의한 영향을 미치는 것을 알 수 있었으며 무역지향성과 무역거래의 불확실성 사이에 제한적 결제업무와 무역금융조달한계는 유의한 부분 매개효과를 가지는 것을 알 수 있었다. 다만, 무역금융지원과 무역보험의 경우 별다른 매개효과를 나타내지 않는 것으로 나타났다. 따라서 사업초기단계의 중소기업의 무역활동을 효과적으로 지원할 수 있는 다양한 방안이 필요함을 확인할 수 있었다. Purpose : The purpose of this study is to confirm that the impact of Variables of financial task between Trade Orientation and Uncertainty on the Early stage SMEs. and take in the whole situation of Early stage SMEs market by this research and it is clear from the findings that Trade financial task of Early stage SMEs market situations and distinctiveness. Research design, data, methodology : Research model and hypotheses have been developed based on literature review and working-level interview, and a questionnaire survey was conducted to 153 Early stage SMEs.(with 5 years or less) The collected data were analysed with structural equation modeling, examining the hypothesized relationships and mediating effect. Results : According The results of research are as follows, first, a Trade Orientation of Early stage SMEs has a positive effect on a Trade Uncertainty. second, a Limited payment business and a Limited trade finance have a partly mediating effect on relationships between a Trade Orientation and a Trade Uncertainty. Trade financial support and Trade insurance have no effect on relationships between a Trade Orientation and a Trade Uncertainty. Conclusions : The Early stage SMEs market need to improve Trade financial environment. To this end, Persistent efforts are involved in that. and at a strategic level, They need the professional theory educations of trade.
컨테이너 육상운송기업의 협력사 인간관계가 기업운영에 미치는 영향에 관한 실증연구
윤태한(Tae Han Yoon) 한국무역연구원 2015 무역연구 Vol.11 No.4
The purpose of this study is to confirm the impact of human relations between main contract transportation firms and subcontracted transportation companies on Company operations. This research likewise intends to take in the whole situation of the Container transportation market. The research model and hypotheses have been developed based on literature review and working-level interviews with a questionnaire survey conducted with departments of 131 subcontracted transportation companies. The collected data were analysed with structural equation modeling by examining the hypothesized relationships and mediating effect. The results of research are as follows: First, business place management, supporting transportation and truck dispatching in subcontracted transportation companies has a positive effect on efficient management. Second, business place management of subcontracted transportation companies has a positive effect on stable management. Third, human relations between main contracted transportation firms and subcontracted transportation companies has a partly mediating effect on relationships between supporting transportation, truck dispatching and an efficient management. human relations has a perfectly mediating effect on relationships between supporting transportation, truck dispatching and a stable management. and it is clear from the findings that container transportation market situations and distinctiveness.