http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
In Gyun Park,Mi Ae Kim,Hyung Joo Yoon,Kyeong Yong Lee,Kyeong San Choi,Yoon Mi Kim 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.04
To substitute for bluebottle fly, Chrysomyia megacephala which is being used for pollinator in mango fruit, and improve the pollinating effect of mango fruit which is also being increased as high value added crop recently in Jeju island of korea, 2 kinds of pollinator were used in analyzing and surveying of foraging activities on mango fruit in Seogwipo province. This study was conducted using 3 species of pollinator, Apis mellifera, Bombus terrestris and Chrysomyia megacephala with 3 treatment in vinyl-house condition respectively. Species of mango fruit, Irwin, was used in this experiment. A number of foraging activity of Apis mellifera and Bombus terrestris in hive showed highest 11 AM, and showed normal foraging activity in high temperature condition(28℃). Pollinating ratio of Bombus terrestris was shown 100% and over 95% in case of Apis mellifera. This ratio suggest that the 2 species of insects is effective as pollinator on mango fruit compared with bluebottle fly. Daily pollinating activity of Apis mellifera and Bombus terrestris was shown peak in 11 AM, but showed even activity from 9 AM to 3 PM in case of Chrysomyia megacephala. The pollinating characteristics of 3 species depends on illuminance but temperature, especially in case of Bombus terrestris was more affected by change of illuminance. Visiting time of Bombus terrestris and Apis mellifera on this flower was shown 2.8 and 3.4 seconds respectively. But Chrysomyia megacephala showed longer 10 times with 32.5 seconds than other insects. This results suppose that Chrysomyia megacephala showed as resting behavior for almost time on the flower not foraging activity to pollinate.
Kyeong Bin Lim,Sun Je Kim,Yong-San Yoon 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, we propose deliberative upper-level behavior planning method for UGV with actively articulated suspension to negotiate geometric obstacle. Proposed deliberative planning method used Q-learning with the expert model for negotiating specific obstacle type. We modify the centipede locomotion pattern to the suspensions’ locomotion and define the MDP using it. In 2D space, we define the state, action and reward model, and apply the conservative ε-greedy action selection method to shorten the behavior plans that is transferred to lower level behavior planner. Also, we use the obstacle negotiation expert model to Q-learning because the state space is too large to solve by Q-learning. We show that Q-learning with expert model can improve the convergence properties in very large space of state and action, and our algorithm can generate the behavior plans for various dimensions of the step up obstacle by simulation environment in our goal time of 10 seconds.
Kyeong Bin Lim,Sukhoon Park,Yong-San Yoon 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Wheels of UGV can be used to get the information about the ground. However, wheels of UGV with actively articulated suspension cannot be used as the roles because the each wheel does not remain in contact with the ground.We proposed IWTC and IATC from the dynamic model, and analyzed them. As the results, we developed the fuzzy rule-based estimation model additionally derived from our observations. IWTC, IATC model and fuzzy model could eliminate the noise of about 60% and 83% respectivel. In addition, fuzzy rule-based estimation model had high sensitivity and precision as well as robustness.
Radiofrequency treatment enhances the catalytic function of an immobilized nanobiohybrid catalyst
San, Boi Hoa,Ha, Eun-Ju,Paik, Hyun-jong,Kim, Kyeong Kyu The Royal Society of Chemistry 2014 Nanoscale Vol.6 No.11
<▼1><P>A new strategy to enhance the functionality of biocatalysts has been demonstrated by combining three processes with enzymes: integration with inorganic nanoparticles, immobilization on the hydrogel, and radiofrequency current treatment.</P></▼1><▼2><P>Biocatalysis, the use of enzymes in chemical transformation, has undergone intensive development for a wide range of applications. As such, maximizing the functionality of enzymes for biocatalysis is a major priority to enable industrial use. To date, many innovative technologies have been developed to address the future demand of enzymes for these purposes, but maximizing the catalytic activity of enzymes remains a challenge. In this study, we demonstrated that the functionality of a nanobiocatalyst could be enhanced by combining immobilization and radiofrequency (RF) treatment. Aminopeptidase PepA-encapsulating 2 nm platinum nanoparticles (PepA–PtNPs) with the catalytic activities of hydrolysis and hydrogenation were employed as multifunctional nanobiocatalysts. Immobilizing the nanobiocatalysts in a hydrogel using metal chelation significantly enhanced their functionalities, including catalytic power, thermal-stability, pH tolerance, organic solvent tolerance, and reusability. Most importantly, RF treatment of the hydrogel-immobilized PepA–PtNPs increased their catalytic power by 2.5 fold greater than the immobilized PepA. Our findings indicate that the catalytic activities and functionalities of PepA–PtNPs are greatly enhanced by the combination of hydrogel-immobilization and RF treatment. Based on our findings, we propose that RF treatment of nanobiohybrid catalysts immobilized on the bulk hydrogel represents a new strategy for achieving efficient biocatalysis.</P></▼2>
San, Boi Hoa,Moh, Sang Hyun,Kim, Kyeong Kyu The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.5
<P>Protein shells have been used as nano-platforms for the synthesis of metallic nanoparticles for their biomedical and biocatalytic applications. However, it is challenging to maximize the catalytic activity of nanoparticles encapsulated by protein shells, as little research exists regarding their effect on the catalytic activities or physicochemical properties of nanoparticles. In this study, we used the following three proteins to synthesize platinum nanoparticles: aminopeptidase PepA, serine endoprotease DegP, and Clp protease. We then compared the catalytic properties of these protein-shelled platinum nanoparticles as scavengers of reactive oxygen species. These protein-shelled platinum nanoparticles displayed the catalase- and superoxide dismutase-like activities by quenching H<SUB>2</SUB>O<SUB>2</SUB> and O<SUB>2</SUB><SUP>−</SUP>, respectively. However, the resulting particle's size and activity depended on the particular protein shell. These results proved that the catalytic activity of protein-shelled platinum nanoparticles is greatly affected by the physicochemical properties of their protein shells. Collectively, current study indicates that protein shells are important determinants for the physical and catalytic properties of platinum nanoparticles and it is necessary to screen protein shells to optimize their functionality. Furthermore, considering the reduced cell toxicity of protein-shelled platinum nanoparticles compared to those synthesized by chemical stabilizers, it is suggested that they can serve as an antioxidant for biomedical purposes.</P> <P>Graphic Abstract</P><P>Platinum nanoparticles synthesized in PepA, DegP or ClpP protein shells displayed catalase- and superoxide dismutase-like activities, and the role of encapsulating proteins in their synthetic process and catalytic function was demonstrated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm14581a'> </P>
Investigation of the heating properties of platinum nanoparticles under a radiofrequency current
San, Boi Hoa,Moh, Sang Hyun,Kim, Kyeong Kyu Informa UK, Ltd. 2013 International journal of hyperthermia Vol.29 No.2
<P><I>Purpose</I>: For the potential application of platinum nanoparticles (PtNPs) in hyperthermia therapy, the heating efficiency of PtNPs in the presence of radiofrequency (RF) current generated by a capacitive electric transfer (CET) system was compared with that of gold nanoparticles (AuNPs).</P><P><I>Materials and methods</I>: PtNPs and AuNPs synthesised by citrate capping (5 nm) were exposed to an RF current of 0.35 ± 0.05 MHz in a CET system. The temperature of the solution containing various concentrations of platinum or gold NPs was monitored for 5 min at various power ranges.</P><P><I>Results</I>: When both NP solutions were exposed to an RF field at a fixed power, the temperature of the NP solution increased continuously over the 5 min of measurement. In contrast, the NP-free solutions did not show any temperature change. Both PtNPs and AuNPs can be heated in a concentration- and power-dependent manner. However, PtNPs showed a higher efficiency in generating heat compared with AuNPs in both water and the physiological buffer.</P><P><I>Conclusions</I>: The heat generating efficiency of 5-nm PtNPs was about 50% higher than that of AuNPs when they were exposed to electric current through RF. This result suggests that PtNPs are promising nanomaterials for RF-induced hyperthermia therapy.</P>
Combining Protein-Shelled Platinum Nanoparticles with Graphene to Build a Bionanohybrid Capacitor
San, Boi Hoa,Kim, Jang Ah,Kulkarni, Atul,Moh, Sang Hyun,Dugasani, Sreekantha Reddy,Subramani, Vinod Kumar,Thorat, Nanasaheb D.,Lee, Hyun Ho,Park, Sung Ha,Kim, Taesung,Kim, Kyeong Kyu American Chemical Society 2014 ACS NANO Vol.8 No.12
<P>The electronic properties of biomolecules and their hybrids with inorganic materials can be utilized for the fabrication of nanoelectronic devices. Here, we report the charge transport behavior of protein-shelled inorganic nanoparticles combined with graphene and demonstrate their possible application as a bionanohybrid capacitor. The conductivity of PepA, a bacterial aminopeptidase used as a protein shell (PS), and the platinum nanoparticles (PtNPs) encapsulated by PepA was measured using a field effect transistor (FET) and a graphene-based FET (GFET). Furthermore, we confirmed that the electronic properties of PepA-PtNPs were controlled by varying the size of the PtNPs. The use of two poly(methyl methacrylate) (PMMA)-coated graphene layers separated by PepA-PtNPs enabled us to build a bionanohybrid capacitor with tunable properties. The combination of bioinorganic nanohybrids with graphene is regarded as the cornerstone for developing flexible and biocompatible bionanoelectronic devices that can be integrated into bioelectric circuits for biomedical purposes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-12/nn503178t/production/images/medium/nn-2014-03178t_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn503178t'>ACS Electronic Supporting Info</A></P>
San, Boi Hoa,Kim, Sungsu,Moh, Sang Hyun,Lee, Hyunjoo,Jung, Duk‐,Young,Kim, Kyeong Kyu WILEY‐VCH Verlag 2011 Angewandte Chemie Vol.123 No.50
<P><B>Außen Bio, innen Nano</B>: Durch Einkapselung von Platin‐Nanopartikeln in einer bakteriellen Aminopeptidase resultiert ein neuartiges Hybridkonstrukt, das Platin‐katalysierte Hydrierung und Peptidase‐katalysierte Hydrolyse zu Mehrstufensynthesen kombinieren kann (siehe Bild). Die Übertragung dieses bioanorganischen Einkapselungskonzepts auf zahlreiche Enzyme und anorganische Materialien kann zu neuartigen multifunktionalen Materialien führen.</P>