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상대적 중요도계수(fi) 를 이용한 환경지표 가중치의 결정
이건모,서상원 한국전과정평가학회 1999 한국전과정평가학회지 Vol.1 No.1
환경목표, 또는 Delphi-like 방법만으로 결정된 가중치의 문제점 및 한계를 분석하였고 이를 토대로 새로운 가중치 부여 방법을 제안하였다. 제안된 가중치는 저감계수(T_(i)/f_(i))와 영향범주간의 상대적인 중요도 계수(f _(i))으로 나타낼 수 잇다. 정책적으로 결정된 임계영향(T_(i)/f_(i))은 사회적으로 허용할 수 있는 수준으로 정의된 임계 damage를 야기시키는 것으로 가정하였으며 상대적인 damage와 정규화된 영향의 상관관계를 나타낸 그래프로 가중치((N_(i)/T_(i)f_(i))가 그래프의 기울기임을 보였다. 또한 상대적인 damage는 가중치가 부여된 환경영향과 같음도 그래프로 설명하였다. Limitations and problems associated with weighting factors based on 'Distance-to-target' or 'Delphi-like' method have been analyzed and a new weighting factor is proposed. The weighting factor proposed is a product of a reduction factor (N_(i)/T_(i)) and a relative significance factor (f_(i)). A politically determined critical impact(T_(i)/f_(i))is assumed to cause a critical damage defined as a level of damage acceptable to a society. A graph showing the relationship between relative damage and normalized impact indicates that the weighting factor ((N_(i)/T_(i))f_(i)) is the slope of this graph. It further shows that the relative damage is the same as the weighted impact.
이건모,김구열,이재기 ( Kun M . Lee,Gu Y . Kim,Jae K . Lee ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
Pyrolytic oil from the pyrolysis process of municipal wastewater sludge is a low grade oil which is high in moisture content and viscosity, and relatively low in calorific value. The oil upgrading experiment was performed in this study to upgrade the quality of the pyrolytic oil. The role of the catalyst, and the effect of reaction temperature, WHSV(Weight Hourly Space Velocity) and oil feed rate on the oil upgrading process were evaluated using a bench scale micro reactor. The ZSM-5 catalyzed the upgrading reaction of the pyrolytic oil and simple heating without catalyst did not upgrade the quality of the pyrolytic oil. The viscosity of the oil appears to be dictated not only by the COOH content but also by the other unknown compounds. The O content, moisture content, viscosity, and COOH/CH₃ ratio of the upgraded oil was decreased by 60, 37, 68 and 17%, and the calorific value was increased by 21%, over the feed oil, when ZSM-5 was used in the upgrading reaction.