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RISS 인기검색어
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- 저자 : John Herbert (검색결과 5 건)
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A Context-Sensitive Rule-based Architecture for a Smart Building Environment
John Herbert,John O’Donoghue,Xiang Chen 보안공학연구지원센터 2009 International Journal of Smart Home Vol.3 No.1
In a smart building environment nomadic users can benefit from specialised context-sensitive services. These can increase productivity and offer an improved lifestyle for users. The Data Management System-Context Architecture (DMS-CA) has been designed to provide these services. The DMS-CA is novel in providing a completely generic system that is both user-friendly and efficient. The system is generic in that it can be tailored by the system administrator (using XML specifications) for a particular environment of context information inputs and a set of services. In addition, the actual rules that determine which services are triggered by which combination of contextual inputs are determined by the individual user in a user-friendly manner. Thus the generic architecture can be easily deployed for a particular building and an individual user. Generic solutions are sometimes inefficient but this system has been designed to be highly efficient through using an event-based architecture and dealing with time in a special way. The DMS-CA has been deployed for a building incorporating a wireless sensor network, and shown to provide a high quality, efficient context-sensitive data delivery service.
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Asymmetric Collapse in Biomimetic Complex Coacervates Revealed by Local Polymer and Water Dynamics
Ortony, Julia H.,Hwang, Dong Soo,Franck, John M.,Waite, J. Herbert,Han, Songi American Chemical Society 2013 Biomacromolecules Vol.14 No.5
<P>Complex coacervation is a phenomenon characterized by the association of oppositely charged polyelectrolytes into micrometer-scale liquid condensates. This process is the purported first step in the formation of underwater adhesives by sessile marine organisms, as well as the process harnessed for the formation of new synthetic and protein-based contemporary materials. Efforts to understand the physical nature of complex coacervates are important for developing robust adhesives, injectable materials, or novel drug delivery vehicles for biomedical applications; however, their internal fluidity necessitates the use of in situ characterization strategies of their local dynamic properties, capabilities not offered by conventional techniques such as X-ray scattering, microscopy, or bulk rheological measurements. Herein, we employ the novel magnetic resonance technique Overhauser dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP), together with electron paramagnetic resonance (EPR) line shape analysis, to concurrently quantify local molecular and hydration dynamics, with species- and site-specificity. We observe striking differences in the structure and dynamics of the protein-based biomimetic complex coacervates from their synthetic analogues, which is an asymmetric collapse of the polyelectrolyte constituents. From this study we suggest charge heterogeneity within a given polyelectrolyte chain to be an important parameter by which the internal structure of complex coacervates may be tuned. Acquiring molecular-level insight to the internal structure and dynamics of dynamic polymer complexes in water through the in situ characterization of site- and species-specific local polymer and hydration dynamics should be a promising general approach that has not been widely employed for materials characterization.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2013/bomaf6.2013.14.issue-5/bm4000579/production/images/medium/bm-2013-000579_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm4000579'>ACS Electronic Supporting Info</A></P>
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NANDFlashSim : High-Fidelity, Microarchitecture-Aware NAND Flash Memory Simulation
Jung, Myoungsoo,Choi, Wonil,Gao, Shuwen,Wilson III, Ellis Herbert,Donofrio, David,Shalf, John,Kandemir, Mahmut Taylan Association for Computing Machinery 2016 Acm transactions on storage Vol.12 No.2
<P>As the popularity of NAND flash expands in arenas from embedded systems to high-performance computing, a high-fidelity understanding of its specific properties becomes increasingly important. Further, with the increasing trend toward multiple-die, multiple-plane architectures and high-speed interfaces, flash memory systems are expected to continue to scale and cheapen, resulting in their broader proliferation. However, when designing NAND-based devices, making decisions about the optimal system configuration is nontrivial, because flash is sensitive to a number of parameters and suffers from inherent latency variations, and no available tools suffice for studying these nuances. The parameters include the architectures, such as multidie and multiplane, diverse node technologies, bit densities, and cell reliabilities. Therefore, we introduce NANDFlashSim, a high-fidelity, latency-variation-aware, and highly configurable NAND-flash simulator, which implements a detailed timing model for 16 state-of-the-art NAND operations. Using NANDFlashSim, we notably discover the following. First, regardless of the operation, reads fail to leverage internal parallelism. Second, MLC provides lower I/O bus contention than SLC, but contention becomes a serious problem as the number of dies increases. Third, many-die architectures outperform many-plane architectures for disk-friendly workloads. Finally, employing a high-performance I/O bus or an increased page size does not enhance energy savings. Our simulator is available at http://nfs.camelab.org.</P>
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Kang, Taegon,Banquy, Xavier,Heo, Jinhwa,Lim, Chanoong,Lynd, Nathaniel A.,Lundberg, Pontus,Oh, Dongyeop X.,Lee, Han-Koo,Hong, Yong-Ki,Hwang, Dong Soo,Waite, John Herbert,Israelachvili, Jacob N.,Hawker, American Chemical Society 2016 ACS NANO Vol.10 No.1
<P>We describe robustly anchored triblock copolymers that adopt loop conformations on surfaces and endow them with unprecedented lubricating and antifouling properties. The triblocks have two end blocks with catechol-anchoring groups and a looping poly(ethylene oxide) (PEO) midblock. The loops mediate strong steric repulsion between two mica surfaces. When sheared at constant speeds of similar to 2.5 mu m/s, the surfaces exhibit an extremely low friction coefficient of similar to 0.002-0.004 without any signs of damage up to pressures of similar to 2-3 MPa that are close to most biological bearing systems. Moreover, the polymer loops enhance inhibition of cell adhesion and proliferation compared to polymers in the random coil or brush conformations. These results demonstrate that strongly anchored polymer loops are effective for high lubrication and low cell adhesion and represent a promising candidate for the development of specialized high-performance biomedical coatings.</P>
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