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광배양 시스템에서 NOx 및 SOx의 배지 pH와 미세조류 생장에 미치는 영향
윤세영,홍민의,심상준 한국수소및신에너지학회 2013 한국수소 및 신에너지학회논문집 Vol.24 No.3
Carbon dioxide reduction technologies using photosynthetic microorganism were suggested to overcome environmental destruction caused by CO2 in flue gases from power plant and other industries. However, there are many toxic constituents in flue gas including CO, NOx, SOx. Continuous and Excessive supply of these noxious gases to cells will leads to inhibition of microalgal growth along with partial cell death. In this study, we tested the noxious effect of SOx and NOx on the pH and microalgal growth under photoautotrophic culture in three microalgae of Neochloris oleoabundans, Chlorella vulgaris and Haematococcus pluvialis. As a result, SOx concentration more than 50 ppm led to the rapid reduction of pH, thereby inhibiting of the growth in Neochloris oleoabundans and Chlorella vulgaris. NOx concentration more the 100 ppm reduced the exponential growth of N. oleoabundans and C. vulgaris. And H. pluvialis exhibited low sensitivity to SOx and NOx. Consequently, the three microalgae of N. oleabundas, C. vulagaris and H. pluvialis showed the normal vegetative growth in 25 ppm of NOx and SOx. Above all, H. pluvialis was useful for the CO2 sequestration of the flue gas including high concentrations of NOx and SOx.
윤세영 경북대학교 사회과학대학 지리학과 2003 地理學論究 Vol.- No.23
본 연구는 식료품유통체계의 변화를 파악하기 위한 전 단계로서, 기업간 네트워크의 개념과 특성, 사회적 뿌리내림을 설명하고 유통체계에 관한 연구동향을 고찰하는데 목적이 있다. 기업간 네트워크는 변화하는 환경 속에서 기업이 생존하고 성장하는데 중요한 역할을 수행한다. 최근 식료품유통체계의 변화 양상은 전통적인 시장이 가지고 있던 시공간적 제한을 극복하여 새롭게 등장한 통신판매와 물류기능의 요구·촉진으로 인한 물류체계의 집약화로 나타나고 있다. 따라서 기업의 행동은 개별 기업만의 행동으로는 설명할 수 없으며 기업간 관계의 측면에서 고찰되어야 한다. 즉, 기업은 전문화를 추구함과 동시에 기업간의 건설적 협력관계를 통하여 외부화된 범위경제를 추구할 수 있는 기업간 네트워크의 구축이 필수적이다. This paper aims to clarify the detailed interfirm network by explaining the definition and characteristics and social embeddedness of the interfirm network. It is based on the assumption that changes in the food distribution system depend mostly on the interfirm network which plays an essential role in the survival and prospect of a firm under a dynamically changing environment. Current changes include the emergence of mail-order businesses as a means to overcome the temporal and spatial restriction of traditional markets and the integration of physical distribution system. The relationship among existing distribution firms is also a leading factor of the changes in food distribution system. Therefore, it is not an individual firm but the interfirm relationship that can account for the position of a firm. In short, it is essential for a firm to establish interfirm networks, in order to pursue scope economy. This is possible trying to specialize its products and maintaining a constructive and cooperative relationship with other firms.