| 1. |
- Huang, Xin, 1982-, et al.
(author)
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Privacy of Value-Added Context-Aware Service Cloud
- 2009
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In: Lecture notes in computer science Volume 5931. - Berlin, Heidelberg : Springer. - 9783642106644 ; , s. 547-552
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Conference paper (peer-reviewed)abstract
- In the cloud computing era, service provider cloud and context service cloud store all your personal context data. This is a positive aspect for value-added context-aware service cloud as it makes that context information collection are easier than was the case previously. However, this computing environment does add a series of threats in relation to privacy protection. Whoever receives the context information is able to deduce the status of the owners and, generally owners are not happy to share this information. In this paper, we propose a privacy preserved framework which can be utilized by value-added context-aware service cloud. Context data and related services access privileges are determined by context-aware role-based access control (CRAC) extended from role-based access control (RAC). Privacy preserved context service protocol (PPCS) is designed to protect user privacy from exposed context information. Additionally, user network and information diffusion is combined to evaluate the privacy protection effect.
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| 2. |
- Lindgren, Cecilia M, et al.
(author)
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Genome-wide association scan meta-analysis identifies three Loci influencing adiposity and fat distribution.
- 2009
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In: PLoS genetics. - : Public Library of Science (PLoS). - 1553-7404. ; 5:6, s. e1000508-
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Journal article (peer-reviewed)abstract
- To identify genetic loci influencing central obesity and fat distribution, we performed a meta-analysis of 16 genome-wide association studies (GWAS, N = 38,580) informative for adult waist circumference (WC) and waist-hip ratio (WHR). We selected 26 SNPs for follow-up, for which the evidence of association with measures of central adiposity (WC and/or WHR) was strong and disproportionate to that for overall adiposity or height. Follow-up studies in a maximum of 70,689 individuals identified two loci strongly associated with measures of central adiposity; these map near TFAP2B (WC, P = 1.9x10(-11)) and MSRA (WC, P = 8.9x10(-9)). A third locus, near LYPLAL1, was associated with WHR in women only (P = 2.6x10(-8)). The variants near TFAP2B appear to influence central adiposity through an effect on overall obesity/fat-mass, whereas LYPLAL1 displays a strong female-only association with fat distribution. By focusing on anthropometric measures of central obesity and fat distribution, we have identified three loci implicated in the regulation of human adiposity.
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| 3. |
- Wei, Jian-Feng, et al.
(author)
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Formation of Kv2.1-FAK complex as a mechanism of FAK activation, cell polarization and enhanced motility
- 2008
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In: Journal of Cellular Physiology. - : Wiley. - 0021-9541 .- 1097-4652. ; 217:2, s. 544-557
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Journal article (peer-reviewed)abstract
- Focal adhesion kinase (FAK) plays key roles in cell adhesion and migration. We now report that the delayed rectifier Kv2.1 potassium channel, through its LD-like motif in N-terminus, may interact with FAK and enhance phosphorylation of FAK(397) and FAK(576/577) Overlapping distribution of Kv2.1 and FAK was observed on soma and proximal dendrites of cortical neurons. FAK expression promotes a polarized membrane distribution of the Kv2.1 channel. In Kv2.1-transfected CHO cells, formation of the Kv2.1-FAK complex was stimulated by fibronectin/integrin and inhibited by the K channel blocker tetraethylammonium (TEA). FAK phosphorylation was minimized by shRNA knockdown of the Kv2.1 channel, point mutations of the N-terminus, and TEA, respectively. Cell migration morphology was altered by Kv2.1 knockdown or TEA, hindering cell migration activity. In wound healing tests in vitro and a traumatic injury animal model, Kv2.1 expression and co-localization of Kv2.1 and FAK significantly enhanced directional cell migration and wound closure. It is suggested that the Kv2.1 channel may function as a promoting signal for FAK activation and cell motility.
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| 4. |
- Cui, J. -P, et al.
(author)
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NEW BROADBAND ZERO PHASE SHIFTER BASED ON NEGATIVE REFRACTION INDEX TRANSMISSION LINE
- 2008
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In: Journal Electromagnetic Waves and Applications. - : Informa UK Limited. - 0920-5071 .- 1569-3937. ; 22:14-15, s. 2069-2075
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Journal article (peer-reviewed)abstract
- This paper presents the design of one dimensional broadband phase shifters based on a new class of negative refraction index transmission line. The proposed phase shifter here consists of conventional microstrip line and Negative Refraction Index (NRI) transmission line (TL) in which ideal operational amplifiers are applied to form the periodically loaded negative-impedance-converted inductors and capacitors. It is demonstrated that variations in inductors and capacitors can produce arbitrary phase shifts while maintaining the same overall length. Also, the NRI-TL is non-dispersive so that the new phase shifter can be used in many new broadband devices.
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| 5. |
- Gao, Yuehong, et al.
(author)
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System Spectral Efficiency and Stability of 3G Networks : A Comparative Study
- 2009
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In: 2009 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-8. - : IEEE Press. - 9781424434350 ; , s. 5398-5403
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Conference paper (peer-reviewed)abstract
- CDMA2000, WCDMA and WiMAX are three widely used 3G technologies. Since they share the same goal, which is to provide broader coverage and higher throughput in 3G networks, an impartial comparison of their performance is indispensable. However, they are based on different design principles and methodologies, which make the comparison challenging. This paper presents a comparative study of these technologies, with focus on system spectral efficiency and stability in 3G networks. Specifically, the paper presents a framework for the comparison based on the common set of configurations adopted by these technologies, which include channel models, system parameters and key algorithms. Through extensive simulations, the system spectral efficiency and stability of CDMA2000 1x EV-DO Rev.A, WCDMA HSDPA/HSUPA and Mobile WiMAX are compared. It is found that while WiMAX can provide highest throughput, the two CDMA-based technologies achieve higher system spectral efficiency, especially on the downlink. Regarding system stability, it is observed that CDMA2000 1x EV-DO Rev.A can operate under higher interference levels than WCDMA HSDPA/HSUPA and Mobile WiMAX. In addition, the comparison on system spectral efficiency between CDMA2000, WCDMA and WiMAX is also conducted when relevant enhanced technologies, i.e., MIMO and interference cancelation, are adopted. We believe that our work will serve as a cornerstone for a fair comparison between the various technologies for prospective 3G networks.
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| 6. |
- Guo, Xin, et al.
(author)
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Direct Coupling of Plasmonic and Photonic Nanowires for Hybrid Nanophotonic Components and Circuits
- 2009
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In: Nano letters (Print). - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 9:12, s. 4515-4519
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Journal article (peer-reviewed)abstract
- We report direct coupling of plasmonic and photonic nanowires using ultracompact near-field interaction. Photon-plasmon coupling efficiency up to 80% with coupling length down to the 200 nm level is achieved between individual Ag and ZnO nanowires. Hybrid nanophotonic components, including polarization splitters, Mach-Zehnder interferometers, and microring cavities, are fabricated out of coupled Ag and ZnO nanowires. These components offer relatively low loss with subwavelength confinement; a hybrid nanowire microcavity exhibits a Q-factor of 520.
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| 7. |
- Holmfeldt, Per, et al.
(author)
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CaMKIIgamma-mediated inactivation of the Kin I kinesin MCAK is essential for bipolar spindle formation.
- 2005
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In: EMBO J. - : Wiley. - 0261-4189. ; 24:6, s. 1256-1266
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Journal article (peer-reviewed)abstract
- MCAK, a member of the kinesin-13 family, is a microtubule (MT) depolymerase that is necessary to ensure proper kinetochore MT attachment during spindle formation. Regulation of MCAK activity and localization is controlled in part by Aurora B kinase at the centromere. Here we analyzed human cells depleted of the ubiquitous Ca(2+)/calmodulin-dependent protein kinase IIgamma isoform (CaMKIIgamma) by RNA interference and found that CaMKIIgamma was necessary to suppress MCAK depolymerase activity in vivo. A functional overlap with TOGp, a MT regulator known to counteract MCAK, was suggested by similar CaMKIIgamma- and TOGp-depletion phenotypes, namely disorganized multipolar spindles. A replicating vector system, which permits inducible overexpression in cells that simultaneously synthesize interfering short hairpin RNAs, was used to dissect the functional interplay between CaMKIIgamma, TOGp, and MCAK. Our results revealed two distinct but functionally overlapping mechanisms for negative regulation of the cytosolic/centrosomal pool of MCAK. These two mechanisms, involving CaMKIIgamma and TOGp, respectively, are both essential for spindle bipolarity in a normal physiological context, but not in MCAK-depleted cells.
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| 8. |
- Hu, Xin, et al.
(author)
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A novel dual-band balun based on the dual structure of composite right/left handed transmission line
- 2006
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Conference paper (peer-reviewed)abstract
- Utilizing the opposite phase shifting property of a standard Composite Right/Left Handed (CRLH) transmission line (TL) and a dual structure of CRLH (D-CRLH) TL, a dual-band balun is designed. The dual-band balun is formed by a 1×2 (3-dB) splitter with a D-CRLH phase-shifting line in the top branch and a CRLH phase-shifting line in the bottom branch. The performance of the balun is verified with circuit simulation at 2.4 GHz and 5.0GHz. The balun exhibits a very wide bandwidth for differential output phase, the return loss is well below -100dB, and the insertion losses |S12| and |S13| are -3.03±0.05dB at both frequencies.
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| 9. |
- Hu, Xin, et al.
(author)
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Compact dual-band rejection filter based on complementary meander line split ring resonator
- 2009
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In: Progress in Electromagnetics Research Letters. - 1937-6480. ; 8, s. 181-190
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Journal article (peer-reviewed)abstract
- A general model for dual band rat-race couplers is presented through an odd-even mode analysis approach. The requirements for the impedances and electrical lengths of the branches are derived. To verify this model, a dual-band rat-race coupler is designed utilizing the balanced composite right/left handed transmission line. The whole structure is much more compact than the existing dual-band rat-race couplers and easy to fabricate. The simulated results are given. Return loss and port isolation of better than -30 dB are achieved at the central frequencies of both operating bands. Furthermore, the requirements of equal amplitude and balanced phase conditions are well fulfilled (within 0.5 dB and 5) over a frequency range of almost 50 and 90 MHz at the two central frequencies.
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| 10. |
- Hu, Xin, et al.
(author)
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Compact slot antenna for 2.4GHz RFID tags
- 2009
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In: 2009 3RD EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION. - NEW YORK : IEEE. - 9781424447534 ; , s. 2694-2696
-
Conference paper (peer-reviewed)abstract
- This paper reports the design of a coplanar waveguide (CPW)-fed capacitive folded-slot antenna for the radio frequency identification (RFID) application at 2.4 GHz. The antenna is fabricated on a 30 X 30 mm substrate. Results from simulation and laboratory measurement are presented. The measured bandwidth is 1.7%. Radiation patterns are bidirectional. The compact and uniplanar antenna is suitable for use as RFID tags.
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| 11. |
- Hu, Xin, et al.
(author)
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Dual-Band-Rejection Filter Based on SplitRing Resonator (SRR) and Complimentary SRR
- 2009
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In: Microwave and optical technology letters (Print). - : Wiley. - 0895-2477 .- 1098-2760. ; 51:10, s. 2519-2522
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Journal article (peer-reviewed)abstract
- A novel concept of a compact, low insertion-loss dual-band-rejection filter (DBRF) is proposed, and its equivalent circuit model is given. The filter consists of single split ring resonators (SRRs) on the top of the host microstrip line and Complimentary SRR etched on the back ground plane. The dimensions of the structure are as small as 1.4 cm × 2 cm, while high frequency selectivity is achieved at both band edges due to the presence of two transmission zeros. The filter has an insertion loss of better than 1 dB, a return loss of larger than 10 dB in the passband from 3.3 to 4.0 GHz, and two rejections of greater than 30 dB within 2.5-2.6 and 5.2-5.6 GHz.
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| 12. |
- Hu, Xin, et al.
(author)
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Dual structure of composite right/left-handed transmission line
- 2006
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In: Journal of Zhejiang University: Science. - 1009-3095. ; 7:10, s. 1777-1780
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Journal article (peer-reviewed)abstract
- A dual structure of composite right/left handed (CRLH) transmission line (TL) is analyzed in which an inductance LR is in parallel with a capacitance CL and a shunt capacitance CR is in series with an inductance LL. Both the distributed and lumped cases are considered. The dispersion diagram and transmission properties of the dual CRLH TL are given and compared with those of a standard CRLH TL. Contrary to the frequency response of a standard CRLH TL, a dual CRLH TL has a left-handed (negative phase shift) band at higher frequencies and a right-handed (positive phase shift) band at lower frequencies. A novel dual-band balun is presented as an application.
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| 13. |
- Hu, Xin, et al.
(author)
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Equivalent Circuit of Complementary Split-Ring Resonator Loaded Transmission Line
- 2009
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In: Microwave and optical technology letters (Print). - : Wiley. - 0895-2477 .- 1098-2760. ; 51:10, s. 2432-2434
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Journal article (peer-reviewed)abstract
- In this article, a circuit model is proposed for the complementary split-ring resonators (CSRRs) loaded transmission line, and comparisons between the results derived from the equivalent circuit model and the experimental results are given and a good agreement between them over a wide frequency band supports the effectiveness of F the proposed modeling methodology. Both the results show the negative f permittivity at the vicinity of the resonance frequency of CSRR. By comparing the results of different periodic length (i.e., the capacitance per-unit-cell of the host microstrip line is changed), the validity of the equivalent circuit is further confirmed.
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| 14. |
- Huang, Xin, et al.
(author)
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ID management among clouds
- 2009
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In: 2009 1st International Conference on Future Information Networks, ICFIN 2009. - : IEEE conference proceedings. - 9781424451586 ; , s. 237-241
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Conference paper (peer-reviewed)abstract
- In the following years, the desktop-based applications will be changed to cloud computing gradually. Since all users' profile and context data will be stored on the service supplier side based on their ID. ID is becoming a security bottleneck: attackers can trace all other information via user ID. Increasingly, a simple service may be involved in a chain of service clouds; each cloud is able to access data in its cloud without the control of any technology. With ID and password cross utilization in clear text, leakage of ID profile and password in one cloud may propagate to the whole cloud chain. Without proper protection, the success of cloud computing will be threatened by ID privacy leakage. In this paper, privacy preserved ID profile utilizing protocol (PPID) is proposed to prevent this privacy flaw. PPID together with its extension ID anonymity protocol (IDA) separate ID and services. With these two protocols, threaten from crash of whole cloud chain caused by ID privacy leakage is minimized.
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| 15. |
- Larsson, Anders, 1977-, et al.
(author)
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Core-Level Expansion of Compressed Test Patterns
- 2008
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In: Proceedings of the Asian Test Symposium. - Sapporo, JAPAN : IEEE Computer Society. - 9780769533964 ; , s. 277-282
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Conference paper (peer-reviewed)abstract
- The increasing test-data volumes needed for the testing of system-on-chip (SOC) integrated circuits lead to long test-application times and high tester memory requirements. Efficient test planning and test-data compression are therefore needed. We present an analysis to highlight the fact that the impact of a test-data compression technique on test time and compression ratio are method-dependant as well as TAM-width dependant. This implies that for a given set of compression schemes, there is no compression scheme that is the optimal with respect to test time reduction and test-data compression at all TAM widths. We therefore propose a technique where we integrate core wrapper design, test architecture design and test scheduling with test-data compression technique selection for each core in order to minimize the SOC test-application time and the test-data volume. Experimental results for several SOCs crafted from industrial cores demonstrate that the proposed method leads to significant reduction in test-data volume and test time.
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| 16. |
- Larsson, Anders, 1977-, et al.
(author)
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SOC Test Optimization with Compression-Technique Selection
- 2008
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In: Proceedings - International Test Conference. - : IEEE. - 9781424424030 - 9781424424023 ; , s. 1-
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Conference paper (other academic/artistic)abstract
- The increasing test-data volumes needed for the testing of system-on-chip (SOC) lead to long test times and high memory requirements. We present an analysis to highlight the fact that the impact of a test-data compression technique on test time and compression ratio are method-dependant as well as TAM-width dependant. Therefore, we propose a technique where compression-technique selection is integrated with core wrapper design, test architecture design, and test scheduling to minimize the SOC test time and the test-data volume.
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| 17. |
- Lynch, S.A., et al.
(author)
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Toward silicon-based lasers for terahertz sources
- 2006
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In: IEEE Journal of Selected Topics in Quantum Electronics. - 1077-260X .- 1558-4542. ; 12:6, s. 1570-1577
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Journal article (peer-reviewed)abstract
- Producing an electrically pumped silicon-based laser at terahertz frequencies is gaining increased attention these days. This paper reviews the recent advances in the search for a silicon-based terahertz laser. Topics covered include resonant tunneling in p-type Si/SiGe, terahertz intersubband electroluminescence from quantum cascade structures, intersubband lifetime measurements in Si/SiGe quantum wells, enhanced optical guiding using buried suicide layers, and the potential for exploiting common impurity dopants in silicon such as boron and phosphorus to realize a terahertz laser. © 2006 IEEE.
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| 18. |
- Newton-Cheh, Christopher, et al.
(author)
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Genome-wide association study identifies eight loci associated with blood pressure
- 2009
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In: Nature Genetics. - : Springer Science and Business Media LLC. - 1546-1718 .- 1061-4036. ; 41:6, s. 666-676
-
Journal article (peer-reviewed)abstract
- Elevated blood pressure is a common, heritable cause of cardiovascular disease worldwide. To date, identification of common genetic variants influencing blood pressure has proven challenging. We tested 2.5 million genotyped and imputed SNPs for association with systolic and diastolic blood pressure in 34,433 subjects of European ancestry from the Global BPgen consortium and followed up findings with direct genotyping (N <= 71,225 European ancestry, N <= 12,889 Indian Asian ancestry) and in silico comparison (CHARGE consortium, N 29,136). We identified association between systolic or diastolic blood pressure and common variants in eight regions near the CYP17A1 (P = 7 x 10(-24)), CYP1A2 (P = 1 x 10(-23)), FGF5 (P = 1 x 10(-21)), SH2B3 (P = 3 x 10(-18)), MTHFR (P = 2 x 10(-13)), c10orf107 (P = 1 x 10(-9)), ZNF652 (P = 5 x 10(-9)) and PLCD3 (P = 1 x 10(-8)) genes. All variants associated with continuous blood pressure were associated with dichotomous hypertension. These associations between common variants and blood pressure and hypertension offer mechanistic insights into the regulation of blood pressure and may point to novel targets for interventions to prevent cardiovascular disease.
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| 19. |
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| 20. |
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| 21. |
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| 22. |
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| 23. |
- Thinh, N.Q., et al.
(author)
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Properties of Ga-interstitial defects in AlxGa 1-xNyP1-y
- 2005
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 71:12
-
Journal article (peer-reviewed)abstract
- A detailed account of the experimental results from optically detected magnetic resonance (ODMR) studies of grown-in defects in (Al)GaNP alloys, prepared by molecular beam epitaxy, is presented. The experimental procedure and an in-depth analysis by a spin Hamiltonian lead to the identification of two Gai defects (Gai-A and Gai-B). New information on the electronic properties of these defects and the recombination processes leading to the observation of the ODMR signals will be provided. These defects are deep-level defects. In conditions when the defect is directly involved in radiative recombination of the near-infrared photoluminescence band, the energy level of the Gai-B defect was estimated to be deeper than ~1.2 eV from either the conduction or valence band edge. In most cases, however, these defects act as nonradiative recombination centers, reducing the efficiency of light emission from the alloys. They can thus undermine the performance of potential photonic devices. High thermal stability is observed for these defects. ©2005 The American Physical Society.
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| 24. |
- Wang, Ming-Wei, et al.
(author)
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Expression of PINCH protein in gliomas and its clinicopathological significance
- 2007
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In: Oncology. - : S. Karger AG. - 0890-9091 .- 0030-2414 .- 1423-0232. ; 72:5-6, s. 343-346
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Journal article (peer-reviewed)abstract
- Objectives: Particularly interesting new cysteine-histidine-rich protein (PINCH), as a LIM domain adapter protein, functions in the integrin and growth factor signal transduction pathway, and is upregulated in tumor-associated stroma in several types of cancers. However, no study of PINCH has been carried out in gliomas, therefore we examined PINCH expression in gliomas and its clinicopathological significance. Methods: PINCH expression was immunohistochemically examined in 82 gliomas, along with 26 matched adjacent normal brain samples and 10 recurred gliomas. Results: PINCH was strongly expressed in the primary (35%, p = 0.0001) or recurred tumors (40%, p = 0.004) and weak in normal brain tissue. PINCH expression was significantly increased in high-grade gliomas (55 vs. 24%, high- vs. low-grade gliomas, p = 0.004). There was no association of PINCH expression with gender, age, tumor number, size, histological type and tumor location (p > 0.05). Conclusions: PINCH expression may be involved in glioma development and differentiation. Copyright © 2008 S. Karger AG.
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| 25. |
- Xueyan, Zhang, et al.
(author)
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NDVI spatial pattern and its differentiation on the Mongolian Plateau
- 2009
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In: JOURNAL OF GEOGRAPHICAL SCIENCES. - : Springer Science and Business Media LLC. - 1009-637X .- 1861-9568. ; 19:4, s. 403-415
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Journal article (peer-reviewed)abstract
- GIMMS NDVI database and geo-statistics were used to depict the spatial distribution and temporal stability of NDVI on the Mongolian Plateau. The results demonstrated that: (1) Regions of interest with high NDVI indices were distributed primarily in forested mountainous regions of the east and the north, areas with low NDVI indices were primarily distributed in the Gobi desert regions of the west and the southwest, and areas with moderate NDVI values were mainly distributed in a middle steppe strap from northwest to southeast. (2) The maximum NDVI values maintained for the past 22 years showed little variation. The average NDVI variance coefficient for the 22-year period was 15.2%. (3) NDVI distribution and vegetation cover showed spatial autocorrelations on a global scale. NDVI patterns from the vegetation cover also demonstrated anisotropy; a higher positive spatial correlation was indicated in a NW-SE direction, which suggested that vegetation cover in a NW-SE direction maintained increased integrity, and vegetation assemblage was mainly distributed in the same specific direction. (4) The NDVI spatial distribution was mainly controlled by structural factors, 88.7% of the total spatial variation was influenced by structural and 11.3% by random factors. And the global autocorrelation distance was 1178 km, and the average vegetation patch length (NW-SE) to width (NE-SW) ratio was approximately 2.4:1.0.
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