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Kim, Jiwon,Lee, Cheongho,Lee, Seung Mok,Lalhmunsiama, Seung Mok,Jung, Jinho Elsevier 2018 Ecotoxicology and environmental safety Vol.147 No.-
<P><B>Abstract</B></P> <P>Batch sorption and leaching of arsenic (1–30mgL<SUP>−1</SUP>) on Fe-sericite composite powder and beads were investigated in this study. Fe-sericite composite powder was made from natural sericite modified with iron, and alginate was used to transform the powder into beads. The maximum sorption capacities of the Fe-sericite composite powder (15.04 and 13.21mgg<SUP>−1</SUP> for As(III) and As(V), respectively) were higher than those of the corresponding beads (9.02 and 7.11mgg<SUP>−1</SUP> for As(III) and As(V), respectively) owing to the higher specific surface area of the powder. In addition, the leaching amounts of As(III) from Fe-sericite composite beads (≤ 15.03%) were higher than those of the corresponding powder (≤ 5.71%). However, acute toxicity of As(III)-sorbed Fe-sericite composite beads toward <I>Daphnia magna</I> was not significantly different from that of the corresponding powder (<I>p</I> > 0.05). Considering higher uptake of the powder particles by the daphnids, Fe-sericite composite beads seem to be a more appropriate and safer sorbent for arsenic removal in practical application. Based on Fe content, Fe-sericite composite beads had similar or higher maximum sorption capacities (71.19 and 56.11mgg<SUP>−1</SUP> Fe for As(III) and As(V), respectively) than those of previously reported sorbents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe-sericite composite was an efficient sorbent for arsenic removal. </LI> <LI> Desorption of arsenic was insignificant to <I>Daphnia magna</I> toxicity. </LI> <LI> Fe-sericite composite beads seemed to be appropriate and safe in real application. </LI> </UL> </P>
Chang, Jiwon,Hong, Ji Won,Chae, Hyunsik,Kim, Han Soon,Park, Kyung Mok,Lee, Kyoung In,Yoon, Ho-Sung The Korean Society of Phycology 2013 ALGAE Vol.28 No.1
A freshwater cyanobacterium, Phormidium autumnale KNUA026, was isolated from puddles of icy water in Gyeongsan City, South Korea and its potential as a biofuel feedstock was investigated. Maximal growth was obtained when the culture was incubated at $25^{\circ}C$ and around pH 9.0. The total lipid content of the isolate was approximately 14.0% of dry weight and it was found that strain KNUA026 was able to autotrophically synthesize heptadecane ($C_{17}H_{36}$) which can be directly used as fuel without requiring a transesterification step. As this benthic cyanobacterium was capable of forming thick mats, it could be easily harvested by gravitational settling and this property may reduce the cost of production in commercial applications. Hence, P. autumnale KNUA026 appears to be a promising resource for use in the production of microalgae-based biofuels.
Active Vibration Control of Composite Shell Structure using Modal Sensor/Actuator System
Seung Jo Kim,Joon Seok Hwang,Jiwon Mok 한국항공우주학회 2006 International Journal of Aeronautical and Space Sc Vol.7 No.1
The active vibration control of composite shell structure has been performed with the optimized sensor/actuator system. For the design of sensor/actuator system, a method based on finite element technique is developed. The nine-node Mindlin shell element has been used for modeling the integrated system of laminated composite shell with PVDF sensor/actuator. The distributed selective modal sensor/actuator system is established to prevent the effect of spillover. Electrode patterns and lamination angles of sensor/actuator are optimized using genetic algorithm. Continuous electrode patterns are discretized according to finite element mesh, and orientation angle is encoded into discrete values using binary string. Sensor is designed to minimize the observation spillover, and actuator is designed to minimize the system energy of the control modes under a given initial condition. Modal sensor/actuator for the first and the second mode vibration control of singly curved cantilevered composite shell structure are designed with the method developed on the finite element method and optimization. For verification, the experimental test of the active vibration control is performed for the composite shell structure. Discrete LQG method is used as a control law.