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최우석,박경진 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1
실제로 구조물에 작용하는 하중은 동하중이다. 그러나 동하중을 그대로 처리하는 것은 매우 고가이기 때문에 해석 및 설계 시 동적계수 등에 의해 변환된 정하중이 사용된다. 동적계수는 일반적으로 경험 등에 의해 결정된다. 따라서 구조물의 어떤 부분은 이러한 정하중하에서 적절치 못하게 설계될 수 있다. 이러한 방법들은 신뢰성이 다소 떨어지고 설계 시 해석의 정확성에 의문을 제기할 수 있다. 본 논문에서는 동하중을 정하중으로 변환하는 해석적 방법을 제안한다. 변환과정은 수학적으로 유도되었다 아울러 개발한 방법의 응용성을 논의하는 과정에서 이 결과가 구조최적설계과정에 어떻게 사용될지를 제시한다. All the forces in the real world act dynamically on structures. Since dynamic loads are extremely difficult to handle in analysis and design, static loads are utilized with dynamic factors. Dynamic factors are generally determined from experiences. Therefore, structural engineers often come up with unreliable solutions. An analytical method is proposed for the transformation of dynamic loads into equivalent static loads. The process is derived and evaluated mathematically. Applicabilities of the method to structural optimization are discussed.
Biological Control Activity of Two Isolates of Pseudomonas fluorescens against Rice Sheath Blight
Choi Gyung-Ja,Kim Jin-Cheol,Park Eun-Jin,Choi Yong-Ho,Jang Kyoung-Soo,Lim He-Kyoung,Cho Kwang-Yun,Lee Seon-Woo The Korean Society of Plant Pathology 2006 Plant Pathology Journal Vol.22 No.3
Two isolates of mucous bacteria, mc75 and pc78, were isolated from fungal culture plate as culture contaminants with an interesting swarming motility. Both isolates were identified as Pseudomonas fluorescens based on microscopy, biochemical analysis, Biolog test and DNA sequence analysis of the 16S rRNA gene. Both strains have the exactly the same 16S rRNA gene sequences, and yet their biological control activity were not identical each other. In vitro analysis of antagonistic activity of two isolates against several plant pathogenic fungi indicated that both produced diffusible and volatile antifungal compounds of unknown identities. Treatment of the bacterial culture of P. fluorescens pc78 and its culture filtrate exhibited a strong biological control activity against rice sheath blight in vivo among six plant diseases tested. More effective disease control activity was obtained from treatment of bacterial culture than that of culture filtrate. Therefore, in addition to antifungal compound and siderophore production, other traits such as biofilm formation and swarming motility on plant surface may contribute to the biological control activity of P.fluorescens pc78 and mc75.