• 생명과학회지
• /
• 제14권2호
• /
• pp.235-238
• /
• 2004

The possibility for developing multistage culture system to cultivate larvae by computer simulation with basic experiments was investigated. This culture system was composed of 3 stages. At the 1st stage, Chlorella sp. were cultivated and at 2nd stage Chlorella sp. were supplied to rotifer (Brachionus plicatilis), and rotifer were supplied to larvae at the 3rd stage. In this study, Chlorella sp. were cultivated by batch culture to search for the possibility of continuous feeding to rotifer at 2 nd stage. The maximum specific growth rate ($\mu$$_{max}$) of Chlorella sp. at the logarithmic phase was 0.56 [1/day]. Rotifer was cultivated by fed-batch culture at the feeding rate of Chlorella sp., $10^3$, $10^4$, $10^{5}$ and $10^{6}$ [cells/rotiferㆍh] to search for the relation between the feeding rate of Chlorella sp. and the growth rate of rotifer. As the results, the minimum feeding rate of Chlorella sp. was 2.8 ${\times}$ $10^4$ [cells/rotiferㆍday] in the multistage culture system, then the change of rotifer concentration at 2nd stage was simulated by computer. The required amount of rotifer for the growth of larvae was also increased as the growth of larvae. On the 9th day of the culture, the rotifer uptake rate of larvae was 250 [cells/rotiferㆍday]. Based on these basic experiments and results, It was suggested that the possibility of multistage culture system to cultivate larvae with continuous feeding of Chlorella sp. and rotifer.r.

• 한국전자통신학회논문지
• /
• 제9권2호
• /
• pp.231-242
• /
• 2014

지구 온난화로 인한 급격한 기후 변화로 인해 단위 면적당 작물의 생산성 향상 및 고품질 작물 재배에 관심이 고조되고 있다. 따라서 본 논문에서는 기존의 담액 수경방식이나 인공광원을 이용한 수경재배 방식이 아닌 광원 트래킹 기법을 적용한 양액 순환 방식의 수경재배기 제어 관리 시스템을 제안한다. 제안하는 수경재배기는 일정한 양의 양액과 물을 수로로 흘려보내 순환시키는 형태인 양액 순환 방식과 수경재배기 하단 부분의 작물도 지속적인 광합성 작용이 가능 하도록 피라미드 형태의 다단구조식으로 설계한다. 아울러 광원 트래킹 기법은 기존 2축, 4축 센서 방식이 아닌 태양광의 그림자를 추적하기 위한 중심축 센서 방식의 5축 센서 방식으로 설계한다. 본 논문에서 제안한 수경재배기를 통해 기존 연구에서 소개되지 않은 광원 트래킹 기법은 작물에 지속적인 광합성 작용으로 작물의 생장 속도를 단축시킬 수 있었으며, 피라미드형태의 다단식구조로 상, 하단 구분 없이 모든 작물이 동일한 형태의 생육환경을 제공받을 수 있어 단위 면적당 높은 작물 생산량이 예상된다.

• 한국환경복원기술학회지
• /
• 제20권6호
• /
• pp.51-66
• /
• 2017

This study was conducted to develop detailed evaluation indicator as a way for evaluating sustainable urban ecosystem health focused on ecological urban elements from an eco-cultural point of view after the appearance of Eco-cultural City to meet various needs. And this study was also conducted to search for ways to utilize the detailed evaluation indicator like institutionalization. Eco-cultural City was defined as a city where ecological environment and cultural environment coexist and was aimed to derive applicable planning indicators in Korea. For this, FGI was executed, planning indicators were derived, and suitability was examined. The weights were calculated based on the selected indicators through AHP expert survey. After getting the result of FGI, experts reviewed the adequacy of definition from Eco-cultural City and its necessity, and the applicability of planning indicators was examined with evaluation of suitability. As a result of evaluating suitability, it was judged that 41 indicators based on an overall average of 4 areas were relatively high on suitability and also important among sectors. As for the analysis result, the priority order in multistage classification was as followed : harmony between human and environment(B) 0.349, environmental resources(A) 0.266, city environment and quality of culture(C) 0.208, and role division and citizen participation(D) 0.177. In the second level of relative importance, environment protection and infra in the role and citizen participation section was the highest, 0.449, harmonization policy and system in calculating weights was the highest.