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Search Results: 1 - 10 of 41568 matches for " Bin Hu "
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Study on Efficiency Optimization of R&D Resources Allocation in Shanghai  [PDF]
Huangxin Li, Bin Hu
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.45029

Based on the R&D activities of Shanghai’s high-tech industries during 2010 to 2012, this paper uses super efficiency DEA model to analyze and evaluate the R&D efficiency of Shanghai’s high-tech industries. The results show that the R&D efficiency of Shanghai’s high-tech industries has dissimilitude. The R&D efficiency values of some high-tech industries are relatively low. There are many redundancies of R&D personnel input. The input and output structure needs to be optimized. Based on this, the paper summarizes the problems in the R&D activities of Shanghai’s high-tech industries and puts forward some countermeasures.

Bioaccumulative Characteristics of Polybrominated Diphenyl Ethers in Channel Catfish and Fish Feeds from China  [PDF]
Xiaozhong Hu, Decong Hu, Bin Wu, Changjun Lin
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.511095

PBDEs are widely used brominated flame retardant, which are increasingly reported in the environment. Concentrations of thirteen PBDEs in a large number of channel catfish and fish feeds collected from Hubei province of China were investigated in this study. A fast isotopic dilution GC-MS method was firstly developed to simultaneously determine thirteen PBDEs in channel catfish and fish feeds in this study, and especially for the first time PBDEs in fish feeds. Pressurized liquid extraction and multi-layer silica gel column chromatography cleanup were used, some important steps and crucial parameters were modified and intensified compared with other literatures, and GC and MS conditions were optimized. The limits of quantitation values of 0.25 - 5 μg·kg-1 wet weight in channel catfish were calculated for PBDEs; so did 1 - 20 μg·kg-1 wet weight in fish feeds. In addition, good repeatability and accuracy of the whole method were achieved. The established methods were therefore suitable for the simultaneous determinations of thirteen PBDEs

A Joint Vehicle-Vehicle/Vehicle-Roadside Communication Protocol for Highway Traffic Safety
Bin Hu,Hamid Gharavi
International Journal of Vehicular Technology , 2011, DOI: 10.1155/2011/718048
Abstract: A joint vehicle-vehicle/vehicle-roadside communication protocol is proposed for cooperative collision avoiding in Vehicular Ad Hoc Networks (VANETs). In this protocol, emergency warning messages are simultaneously transmitted via Vehicle-to-Vehicle (V2V) and Vehicle-to-Roadside (V2R) communications in order to achieve multipath diversity routing. In addition, to further improve communication reliability and achieve low latency, a Multi-Channel (MC) technique based on two nonoverlapping channels for Vehicle-Vehicle (V2V) and V2R (or R2V) is proposed. The simulation results demonstrate that the proposed joint V2V/V2R (R2V) communication protocol is capable of improving the message delivery ratio and obtaining low latency, which are very important merits for highway traffic safety. 1. Introduction Every year thousands of deaths occur due to traffic accidents, about 60 percent of which could be avoided if drivers were provided with a warning at least one-half second prior to a collision [1]. Because of perception limitations, vehicle drivers cannot react in time to emergency events, hence resulting in a long delay in delivering warning messages and potential automobile crashes (especially multicar chain accidents). As stated in [2], perception limitations are mainly caused by the line-of-sight limitations of brake lights and driver reaction to it, which typically ranges from 0.7 to 1.5 seconds. Aimed at a reduction of vehicular fatalities, Intelligent Transportation Systems (ITS) applications, such as emergency message communication protocols, have been developed to substantially reduce the delay in propagating emergency messages. In July 2003, the Dedicated Short Range Communication (DSRC) standard [3] is adopted by the American Society for Testing and Material (ASTM) standardization committee to support public safety and nonsafety applications, where safety messages have higher priority [4]. DSRC is a short to medium range wireless protocol specifically designed for vehicles at typical highway speeds, including V2V and V2R (R2V) communications. Previous research for V2V communications has focused on two main areas, namely Medium Access Control (MAC) and message forwarding. Although IEEE 802.11 MAC is considered the de facto MAC protocol for DSRC [5], other protocols, such as Time Division Multiple Access- (TDMA-) based slotted MAC protocols have also been proposed [6, 7]. The main problem with the latter approach is the difficulties in handling distributed slot synchronization and allocation in multihops networks under the high mobility conditions typical
What Is the Optimal Value of the g-Ratio for Myelinated Fibers in the Rat CNS? A Theoretical Approach
Taylor Chomiak,Bin Hu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007754
Abstract: The biological process underlying axonal myelination is complex and often prone to injury and disease. The ratio of the inner axonal diameter to the total outer diameter or g-ratio is widely utilized as a functional and structural index of optimal axonal myelination. Based on the speed of fiber conduction, Rushton was the first to derive a theoretical estimate of the optimal g-ratio of 0.6 [1]. This theoretical limit nicely explains the experimental data for myelinated axons obtained for some peripheral fibers but appears significantly lower than that found for CNS fibers. This is, however, hardly surprising given that in the CNS, axonal myelination must achieve multiple goals including reducing conduction delays, promoting conduction fidelity, lowering energy costs, and saving space.
Magnetoacoustic Imaging of Electrical Conductivity of Biological Tissues at a Spatial Resolution Better than 2 mm
Gang Hu, Bin He
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0023421
Abstract: Magnetoacoustic tomography with magnetic induction (MAT-MI) is an emerging approach for noninvasively imaging electrical impedance properties of biological tissues. The MAT-MI imaging system measures ultrasound waves generated by the Lorentz force, having been induced by magnetic stimulation, which is related to the electrical conductivity distribution in tissue samples. MAT-MI promises to provide fine spatial resolution for biological tissue imaging as compared to ultrasound resolution. In the present study, we first estimated the imaging spatial resolution by calculating the full width at half maximum (FWHM) of the system point spread function (PSF). The actual spatial resolution of our MAT-MI system was experimentally determined to be 1.51 mm by a parallel-line-source phantom with Rayleigh criterion. Reconstructed images made from tissue-mimicking gel phantoms, as well as animal tissue samples, were consistent with the morphological structures of the samples. The electrical conductivity value of the samples was determined directly by a calibrated four-electrode system. It has been demonstrated that MAT-MI is able to image the electrical impedance properties of biological tissues with better than 2 mm spatial resolution. These results suggest the potential of MAT-MI for application to early detection of small-size diseased tissues (e.g. small breast cancer).
An Incentive Compatible Reputation Model for P2P Networks
Jianli Hu,Bin Zhou
International Journal of Wireless and Microwave Technologies , 2011, DOI: 10.5815/ijwmt.2011.02.09
Abstract: An important challenge regarding peer's trust assessment in peer-to-peer (P2P) networks is how to cope with such issues as the fraudulent behaviors and the dishonest feedback behaviors from malicious peers, and the issue of inactive recommendations to others. However, these issues cannot be effectively addressed by the existing solutions. Thus, an incentive compatible reputation management model for P2P networks, named ICRM, is proposed to solve them. In ICRM, the metric of time zone is used to describe the time property of the transaction experience and the recommendation. Three other metrics such as the direct trust value, the recommendation trust value and the recommendation credibility, based on the metric of time zone are applied to express accurately the final trust level of a peer. Furthermore, the participating level is introduced as the metric to identify a peer's activeness degree. Theoretical analysis and simulation experiments demonstrate that, ICRM can effectively suppress the malicious behaviors such as providing unreliable services, or giving dishonest feedbacks to others in the P2P networks. What's more, it also can incent peers to offer recommendations to others more actively.
Local electronic structures on the superconducting interface $LaAlO_{3}/SrTiO_{3}$
Bin Liu,Xiao Hu
Physics , 2010, DOI: 10.1103/PhysRevB.81.144504
Abstract: Motivated by the recent discovery of superconductivity on the heterointerface $LaAlO_{3}/SrTiO_{3}$, we theoretically investigate its local electronic structures near an impurity considering the influence of Rashba-type spin-orbit interaction (RSOI) originated in the lack of inversion symmetry. We find that local density of states near an impurity exhibits the in-gap resonance peaks due to the quasiparticle scattering on the Fermi surface with the reversal sign of the pairing gap caused by the mixed singlet and RSOI-induced triplet superconducting state. We also analyze the evolutions of density of states and local density of states with the weight of triplet pairing component determined by the strength of RSOI, which will be widely observed in thin films of superconductors with surface or interface-induced RSOI, or various noncentrosymmetric superconductors in terms of point contact tunneling and scanning tunneling microscopy, and thus reveal an admixture of the spin singlet and RSOI-induced triplet superconducting states.
Timelike Vector Field Dynamics in the Early Universe
Seoktae Koh,Bin Hu
Physics , 2009, DOI: 10.3938/jkps.60.1983
Abstract: We study the dynamics of a timelike vector field which violates Lorentz invariance when the background spacetime is in an accelerating phase in the early universe. It is shown that a timelike vector field is difficult to realize an inflationary phase, so we investigate the evolution of a vector field within a scalar field driven inflation model. And we calculate the power spectrum of the vector field without considering the metric perturbations. While the time component of the vector field perturbations provides a scale invariant spectrum when $\xi = 0$, where $\xi$ is a nonminimal coupling parameter, both the longitudinal and transverse perturbations give a scale invariant spectrum when $\xi = 1/6$.
Statistically Significant Strings are Related to Regulatory Elements in the Promoter Regions of Saccharomyces cerevisiae
Rui Hu,Bin Wang
Physics , 2000, DOI: 10.1016/S0378-4371(00)00488-X
Abstract: Finding out statistically significant words in DNA and protein sequences forms the basis for many genetic studies. By applying the maximal entropy principle, we give one systematic way to study the nonrandom occurrence of words in DNA or protein sequences. Through comparison with experimental results, it was shown that patterns of regulatory binding sites in Saccharomyces cerevisiae(yeast) genomes tend to occur significantly in the promoter regions. We studied two correlated gene family of yeast. The method successfully extracts the binding sites varified by experiments in each family. Many putative regulatory sites in the upstream regions are proposed. The study also suggested that some regulatory sites are a ctive in both directions, while others show directional preference.
Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model
Xian Gao,Bin Hu
Physics , 2009, DOI: 10.1088/1475-7516/2009/08/012
Abstract: We investigate the primordial trispectra of the general multifield DBI inflationary model. In contrast with the single field model, the entropic modes can source the curvature perturbations on the super horizon scales, so we calculate the contributions from the interaction of four entropic modes mediating one adiabatic mode to the trispectra, at the large transfer limit ($T_{RS}\gg1$). We obtained the general form of the 4-point correlation functions, plotted the shape diagrams in two specific momenta configurations, "equilateral configuration" and "specialized configuration". Our figures showed that we can easily distinguish the two different momenta configurations.
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