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Search Results: 1 - 10 of 42378 matches for " NING Hong "
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Cyber-Physical-Social Based Security Architecture for Future Internet of Things  [PDF]
Huansheng Ning, Hong Liu
Advances in Internet of Things (AIT) , 2012, DOI: 10.4236/ait.2012.21001
Abstract: As the Internet of Things (IoT) is emerging as an attractive paradigm, a typical IoT architecture that U2IoT (Unit IoT and Ubiquitous IoT) model has been presented for the future IoT. Based on the U2IoT model, this paper proposes a cyber-physical-social based security architecture (IPM) to deal with Information, Physical, and Management security perspectives, and presents how the architectural abstractions support U2IoT model. In particular, 1) an information security model is established to describe the mapping relations among U2IoT, security layer, and security requirement, in which social layer and additional intelligence and compatibility properties are infused into IPM; 2) physical security referring to the external context and inherent infrastructure are inspired by artificial immune algorithms; 3) recommended security strategies are suggested for social management control. The proposed IPM combining the cyber world, physical world and human social provides constructive proposal towards the future IoT security and privacy protection.
Collision-Tolerant Transmission with Narrow-beam Antennas  [PDF]
Hong-Ning DAI, Kam-Wing NG, Min-You WU, Bo LI
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2008, DOI: 10.4236/ijcns.2008.14035
Abstract: The application of directional antennas in wireless ad hoc networks brings numerous benefits, such as increased spatial reuse and mitigated interference. Most MAC protocols with directional antennas are based on the RTS/CTS mechanism which works well in wireless ad hoc networks using omni-directional antennas. However, RTS/CTS frames cannot mitigate the interference completely. Besides, they also contribute a lot to the performance overhead. This paper studies the problem from a new perspective. We have found that the transmission success probability under directional transmission and directional reception is quite high when the antenna beamwidth is quite narrow. Motivated by the analytical results, we design a lightweight MAC protocol without RTS/CTS frames. The evaluation results demonstrate that this new protocol performs better than MAC protocols based on the RTS/CTS mechanism. The results also show that a collision-tolerant transmission is feasible under the narrow beam configuration.
Prediction of protein folding rates from primary sequence by fusing multiple sequential features  [PDF]
Hong-Bin Shen, Jiang-Ning Song, Kuo-Chen Chou
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.23024
Abstract: We have developed a web-server for predicting the folding rate of a protein based on its amino acid sequence information alone. The web- server is called Pred-PFR (Predicting Protein Folding Rate). Pred-PFR is featured by fusing multiple individual predictors, each of which is established based on one special feature derived from the protein sequence. The ensemble pre-dictor thus formed is superior to the individual ones, as demonstrated by achieving higher correlation coefficient and lower root mean square deviation between the predicted and observed results when examined by the jack-knife cross-validation on a benchmark dataset constructed recently. As a user-friendly web- server, Pred-PFR is freely accessible to the public at www.csbio.sjtu.edu.cn/bioinf/Folding Rate/.
The Synthesis and Storage Sites of Phenolic Compounds in the Root and Rhizome of Echinacea purpurea  [PDF]
Zengqi Li, Tiexin Tang, Shejian Liang, Xiping Ning, Mei Bai, Hong Wu
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.34066
Abstract: Cichoric acid is the main phenolic compound in the root and rhizome of the medicinal part, Echinacea purpurea that is known for possessing immune enhancing characteristics. In this study, we analysis the the synthesis and storage sites of phenolic compound in E. purpurea. We used fluorescent microscopy, transmission electron microscopy, cytochemical and immunocytochemical localization to observe the distribution of phenolic compounds. Our results show that the phenolic compounds were mostly distributed in the cortex parenchyma cells, vascular parenchyma cells and pith parenchyma cells in the root and rhizome, and mainly present in the vacuoles, large intercellular spaces and their surrounding cell walls. No phenolic compounds were observed in the cytoplasm and the organelles. We concluded that the phenolic compounds were synthetized in the cortex parenchyma cells, vascular parenchyma cells and pith parenchyma cells in the root and rhizome, and stored in the vacuoles of parenchyma cells. The above results provided significantly cytological information for further approaching the metabolic regulation and transfer pathways of phenolic compounds in biochemistry and molecular biology.
Modulation of Outer Hair Cell Electromotility by Cochlear Supporting Cells and Gap Junctions
Ning Yu,Hong-Bo Zhao
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007923
Abstract: Outer hair cell (OHC) or prestin-based electromotility is an active cochlear amplifier in the mammalian inner ear that can increase hearing sensitivity and frequency selectivity. In situ, Deiters supporting cells are well-coupled by gap junctions and constrain OHCs standing on the basilar membrane. Here, we report that both electrical and mechanical stimulations in Deiters cells (DCs) can modulate OHC electromotility. There was no direct electrical conductance between the DCs and the OHCs. However, depolarization in DCs reduced OHC electromotility associated nonlinear capacitance (NLC) and distortion products. Increase in the turgor pressure of DCs also shifted OHC NLC to the negative voltage direction. Destruction of the cytoskeleton in DCs or dissociation of the mechanical-coupling between DCs and OHCs abolished these effects, indicating the modulation through the cytoskeleton activation and DC-OHC mechanical coupling rather than via electric field potentials. We also found that changes in gap junctional coupling between DCs induced large membrane potential and current changes in the DCs and shifted OHC NLC. Uncoupling of gap junctions between DCs shifted NLC to the negative direction. These data indicate that DCs not only provide a physical scaffold to support OHCs but also can directly modulate OHC electromotility through the DC-OHC mechanical coupling. Our findings reveal a new mechanism of cochlear supporting cells and gap junctional coupling to modulate OHC electromotility and eventually hearing sensitivity in the inner ear.
A new electrical contact alloy with high reliability based on gold
Yuantao Ning,Ying Peng,Hong Dai
Gold Bulletin , 2002, DOI: 10.1007/BF03214842
Abstract: A new gold alloy (NSCGA) was designed and prepared for light duty precision contacts. The microstructure, mechanical, electrical and applied properties of the NSCGA alloy were studied. The NSCGA alloy contains copper, palladium, platinum, nickel and rhodium as well as gold. The unique structure comprised of two phases, a gold-rich solid solution as the matrix and a platinum-rich solid solution as a strengthening phase. The matrix presents short-range ordering in the temperature range 200-900°C, which leads to the specific resistance of the alloy decreasing, and a modulated structure at low temperatures, which is responsible for age strengthening. The NSCGA alloy has low specific resistance, high tensile strength and high Vickers hardness. Various TO-5 type relays (TO-5 relay is a sealed mini relay with magnetic preservation) with NSCGA alloy as contacts were prepared and tested in a special relay factory under industrial conditions. NSCGA alloy contacts showed stable and low contact resistance, long loading life and high reliability, superior to that of an available conventional sixcomponent palladium alloy. The NSCGA alloy and the composites with NSCGA alloy as a covering layer and copper alloys as a base have been evaluated in various TO-5 type mini relays and other electric products.
Effects of localized impurity on a dark soliton in a Bose--Einstein condensate with an external magnetic trap

Li Hong,Wang Dong-Ning,

中国物理 B , 2009,
Abstract: The dynamics of a dark soliton has been investigated in a Bose--Einstein condensate with an external magnetic trap, and the effects of localized impurity on the dynamics are discussed by the variational approach based on the renormalized integrals of motion. The reciprocal movement of the dark soliton is discussed by performing a standard linear analysis, and it is found that the effects of the localized impurity depend strictly on the positive or negative value of the impurity strength corresponding to the repulsive or attractive impurity. The numerical results confirm the theoretical analysis, and show that the effects also depend on the effective nonlinear coefficient and the harmonic frequency.
Influence of Microwave Radiation on Properties and Structureof Fe_2O_3/SO_4~(2-) Solid Superacid Catalyst
Influence of Microwave Radiation on Properties and Structure of Fe_2O_3/SO_4~(2-) Solid Superacid Catalyst

Yinan NING Jiaqiang WANG,Pinjie HONG,

材料科学技术学报 , 1996,
Abstract: The microwave radiation method was introduced to prepare the Fe_2O_3/SO solid superacid.Its structure and properties were investigated by means of X-ray diffraction and infrared spectrum analyses as well as measurement of magnetic susceptibility and rate of esterification. The structure of the superacids prepared in microwave field can be crystalline or non-crystalline, the latter has not been reported yet in literatures. Comparing with the traditional superacid, the non-crystalline Fe2O3/SO superacid prepared in microwave field has the highest magnetic susceptibility and catalytic activity. The di-coordination of Fe2O3 and SO and the S=O bi-bond were reinforced by microwave radiation, which is favorable for increasing the acid intensity of the Fe2O3/SO catalyst
Effects of periodic optical lattice potential on dark solitons in a Bose Einstein condensate

Li Hong,Wang Dong-Ning,

中国物理 B , 2009,
Abstract: This paper investigates the dynamics of dark solitons in a Bose--Einstein condensate with a magnetic trap and an optical lattice (OL) trap, and analyses the effects of the periodic OL potential on the dynamics by applying the variational approach based on the renormalized integrals of motion. The results show that the dark soliton becomes only a standing-wave and free propagation of the dark soliton is not possible when the periodic length of the OL potential is approximately equal to the effective width of the dark soliton. When the periodic length is very small or very large, the effects of the OL potential on the dark soliton will be sharply reduced. Finally, the numerical results confirm these theoretical findings.
Hong Xu,Hongshun Sun,Ning Xu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809023277
Abstract: The asymmetric unit of the title compound, C11H11NO3, contains two crystallographically independent molecules. The aromatic rings are oriented at a dihedral angle of 56.17 (5)°. The furan rings adopt envelope conformations. Intramolecular C—H...N interactions results in the formation of two six-membered rings with twisted conformations. In the crystal structure, three weak C—H...π interactions are found.
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