이 연구는 산림인증의 효과를 계량적으로 분석하기 위하여 비시장재 평가기법 중 하나 인 선택실험기법을 적용하여 서울시민을 대상으로 무작위 추출법으로 획득한 표본 중 88 부를 분석에 활용하였다. 분석결과, 지불의사에 영향을 미치는 사회경제적 변수 중 성 별, 직업, 학력 등에서 유의수준 5%에서 유의한 것으로 나타났으며 각 속성에 대한 한계 가치를 도출하였다. 이를 통해 목제품에 투영된 산림인증의 경제적 가치는 56,795원으로 분석되었으며, 이는 대상 제품 가격의 14.1% 수준에 해당하는 것으로 나타났다.

Recently, the energy supply uses mostly fossil fuels such as coal, petroleum, natural gas etc... however, they are limited and they present an issue for the environment. Biomass derived energy is considered promising for reducing the emissions of CO2, the significant contributor to global warming. Also it can be converted to various forms of energy through thermochemical conversion processes. In this study, a screw gasifier has been engineered for wood biomass gasification. Waste wood chip was used as biomass and the producer gas, tar; char were then achieved by gasification in the presence of CO2. The results showed that with the increase of the gasification temperature, the producer gas increased and the tar decreased. Also, due to thermal cracking, the light tar increased by the decomposition of the gravimetric tar. And a development of char pore structure was confirmed by SEM. The gasification of biomass in the presence of CO2 at 800oC produced an increase in the concentration of carbon monoxide according to the Boudoudard reaction and an increase in the char pore surface as well as its adsorption capacity. Thus the biomass gasification in the presence of CO2 was confirmed to be effective for the production of CO and the development of char.