94 research outputs found
A preliminary approach to detect and track events in social media
No full textMany algorithms have been proposed to model spatiotemporal events in both sensor network and social networks. However, most of them can not fullfil the task in a social network data streaming context. We proposed an evolving Mean Shift clustering based algorithm to formulate a robust system to automatically detect and track events in social network media. We also demonstrate its performance in empirical experiments. Our online system can be udapted and maintained without comsuming too much system resources which may formulate a good basis for event detection and tracking in the domain of real-time social network media.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01The student, Minyi Tang, accepted the attached license on 2016-04-27 at 14:47.The student, Minyi Tang, submitted this Thesis for approval on 2016-04-27 at 14:52.This Thesis was approved for publication on 2016-04-28 at 10:38.DSpace SAF Submission Ingestion Package generated from Vireo submission #9553 on 2016-07-07 at 13:51:03Made available in DSpace on 2016-07-07T20:35:24Z (GMT). No. of bitstreams: 2
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Previous issue date: 2016-04-28Embargo set by: Seth Robbins for item 93196
Lift date: 2018-07-07T20:35:34Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 93196 on 2018-07-08T09:15:33Z
Spin-orbit interactions in electronic structure quantum Monte Carlo.
No full textWe develop generalization of the fixed-phase diffusion Monte Carlo method for Hamiltonians which explicitly
depends on particle spins such as for spin-orbit interactions. The method is formulated in a zero-variance manner
and is similar to the treatment of nonlocal operators in commonly used static-spin calculations. Tests on atomic
and molecular systems show that it is very accurate, on par with the fixed-node method. This opens electronic
structure quantum Monte Carlo methods to a vast research area of quantum phenomena in which spin-related
interactions play an important role
*Corresponding author
No full textUsing sticker to solve the 3-dimensional matching problem in molecular supercomputer
PIV measurements of turbulent jets issuing from triangular and circular orifice plates
No full textThe present study experimentally investigated the near-field flow mixing characteristics of two turbulent jets issuing from equilateral triangular and circular orifice plates into effectively unbounded surroundings, respectively. Planar particle image velocimetry (PIV) was applied to measure the velocity field at the same Reynolds number of Re=50,000, where Re = U(e)D(e)/ν with U(e) being the exit bulk velocity and ν the kinematic viscosity of fluid, D(e) the equivalent diameters. The instantaneous velocity, mean velocity, Reynolds stresses were obtained. From the mean velocity field, the centreline velocity decay rate and half-velocity width were derived. Comparing the mixing characteristics of the two jets, it is found that the triangular jet has a faster mixing rate than the circular counterpart. The triangular jet entrainments with the ambient fluid at a higher rate in the near field. This is evidenced by a shorter unmixed core, faster Reynolds stress and centreline turbulence intensity growth. The primary coherent structures in the near field are found to break down more rapidly in the triangular jet as compared to the circular jet. Over the entire measurement region, the triangular jet maintained a higher rate of decay and spread. Moreover, all components of Reynolds stress of the triangular jet appear to reach their peaks earlier, and then decay more rapidly than those of the circular jet. In addition, the axis-switching phenomenon is observed in the triangular jet.XU MinYi, ZHANG JianPeng, MI JianChun, NATHAN G J & KALT P A
The impact of death literacy on self-management behaviors in gastric cancer patients: the chain mediating role of psychological adaptation and cognitive reappraisal
No full textPerformance of network coded systems supported by automatic repeat request
No full textInspired by the network information theory, network coding was invented in 2000. Since then, the theory and application of network coding have received intensive research and various network coding schemes have been proposed and studied. It has been demonstrated that the packet-level network coding has the potential to outperform the traditional routing strategies in packet networks. By taking the advantages of the information carried by the packets sent to different receivers (sinks) in a packet network, packet-level network coding is capable of reducing the number of packets transmitted over the network. Therefore, the packet-level network coding employs the potential for boosting the throughput of packet networks. By contrast, the symbol-level network coding, which is also referred to as the physical-layer network coding, is capable of exploiting interference instead of avoiding it for improving the channel capacity and/or enhancing the reliability of communications. In this thesis, our focus is on the packet-level network coding.Performance of communication systems with network coding has been widely investigated from different perspectives, mainly under the assumption that packets are reliably transmitted over networks without errors. However, in practical communication networks, transmission errors always occur and error-detection or error-correction techniques are required in order to ensure reliable communications. Therefore, in this report, we focus our attention mainly on studying the performance of the communication networks with packet-level network coding, where Automatic Retransmission reQuest (ARQ) schemes are employed for error protection. Three typical ARQ schemes are invoked in our research, which are the Stop-and-Wait ARQ (SW-ARQ), Go-Back-N ARQ (GBN-ARQ) and the Selective-Repeat ARQ (SR-ARQ). Our main concern is the impact of network coding on the throughput performance of network coding nodes or networks containing network coding nodes. Additionally, the impact of network coding on the delay performance of network coding nodes or coded networks is also addressed.In a little more detail, in Chapter 3 of the thesis, we investigate the performance of the networks employing packet-level network coding, when assuming that transmission from one node to another is not ideal and that a certain ARQ scheme is employed for error-control. Specifically, the delay characteristics of general network coding node are first analyzed. Our studies show that, when a coding node invokes more incoming links, the average delay for successfully forming coded packets increases. Then, the delay performance of the Butterfly networks is investigated, which shows that the delay generated by a Butterfly network is dominated by the communication path containing the network coding node. Finally, the performance of the Butterfly network is investigated by simulation approaches, when the Butterfly network employs SW-ARQ, GBN-ARQ, or SR-ARQ for error-control. The achievable throughput, the average delay as well as the standard deviation of the delay are considered. Our performance results show that, when given a packet error rate Packet Error Rate (PER), the SR-ARQ scheme is capable of attaining the highest throughput and resulting in the lowest delay among these three ARQ schemes.In Chapter 4, the steady-state throughput of general network coding nodes is investigated, when the SW-ARQ scheme is employed. We start with considering a Two-Input-Single-Output (2ISO) network coding node without queueing buffers. Expressions for computing the steady-state throughput is derived. Then, we extend our analysis to the general H-Input-Single-Output (HISO) network coding nodes without queueing buffers. Finally, our analytical approaches are further extended to the HISO network coding nodes with queueing buffers. A range of expressions for evaluating the steady-state throughput are obtained. The throughout performance of the HISO network coding nodes is investigated by both analytical and simulation approaches. Our studies in this chapter show that the throughput of a network coding node decreases, as the number of its incoming links increases. This property implies that, in a network coding system, the coding nodes may form the bottlenecks for information delivery. Furthermore, the studies show that adding buffers to the network coding node may improve the throughput performance of a network coding system.Then, in Chapters 5 and 6, we investigate the steady-state throughput performance of the general network coding nodes, when the GBN-ARQ in Chapter 5 or the SR-ARQ in Chapter 6 is employed. Again, analytical approaches for evaluating the steady-state throughput of the general network coding nodes are concerned and a range of analytical results are obtained. Furthermore, the throughput performance of the network coding nodes supported by the GBN-ARQ or SR-ARQ is investigated by both simulations and numerical approaches.Finally, in Chapter 7, the conclusions extracted from the research are summarized and the possible directions for future research are proposed
Large Eddy Simulation of an Initially-Confined Triangular Oscillating Jet
No full textThis paper reports the first large eddy simulation (LES) of a self-excited oscillating triangular jet (OTJ) issuing from a fluidic nozzle that consists of a small triangular orifice inlet followed by a large circular chamber and an orifice outlet. The case simulated is identical to that measured experimentally by England et al. (Exp Fluids 48(1): 69-80, 2010). The present prediction agrees well with the previous measurement. The simulation reveals that the central oscillating jet exhibits axis-switching in the cross-section and rotates by 60 degrees approximately over a downstream distance of x = 0.5D (chamber diameter). Three strong longitudinal vortices occur associated with the three vertices of the inlet triangle. These vortices strongly interact with the central jet and also the surroundings, in the region at x/D <= 1, and appear to merge finally with the outer secondary swirling flow. These observations are consistent with the deduction from previous experiments.ThermodynamicsMechanicsSCI(E)EI0ARTICLE3367-3868
Transporter Associated with Antigen Processing 1 Gene Polymorphisms Increase the Susceptibility to Tuberculosis
No full textTianchang Lu,1,* Minyi Wang,1,2,* Nannan Liu,1 Shuqiong Zhang,3 Lei Shi,1 Ling Bao,3 Feng Luo,3 Li Shi,1 Shuyuan Liu,1 Yufeng Yao4 1Department of Immunogenetics, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming, 650118, People’s Republic of China; 2School of Life Science, Yunnan University, Kunming, 650500, People’s Republic of China; 3Department of Clinical Laboratory, The Third People’s Hospital of Kunming, Kunming, 650041, People’s Republic of China; 4Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Disease, Kunming, 650118, People’s Republic of China*These authors contributed equally to this workCorrespondence: Shuyuan Liu, Department of Immunogenetics, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming, 650118, People’s Republic of China, Tel +86 871 68334483, Email [email protected] Yufeng Yao, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Disease, Kunming, 650118, People’s Republic of China, Tel +86 871 68335632, Email [email protected]: Tuberculosis (TB) is known to result from a complex interaction between the host immune response and Mycobacterium infection. The transporter associated with antigen processing (TAP) plays an important role in the processing and presentation pathways for the Mycobacterium tuberculosis (M. tb) antigen. To investigate the possible association of the TAP1 and TAP2 genes with TB.Patients and Methods: A total of 449 TB patients and 435 control subjects were included in this study, and single nucleotide polymorphisms (SNPs) in the TAP gene, as well as TAP1 and TAP2 alleles, were genotyped.Results: TAP gene association analysis of TB diseases showed that rs41551515-T in the TAP1 gene was significantly associated with susceptibility to TB (P=7.96E-04, OR=4.124, 95% CI: 1.683– 10.102), especially pulmonary TB (PTB, P=6.84E-04, OR=4.350, 95% CI: 1.727– 10.945), and the combination of rs1057141-T-rs1135216-C in the TAP1 gene significantly increased the risk of TB susceptibility (P=5.51E-05, OR=10.899, 95% CI: 2.555– 46.493). Five novel TAP1 alleles were detected in Yunnan Han people, and the allele frequency of TAP1*unknown_3 (rs41555220-rs41549617-rs1057141-rs1135216-rs1057149-rs41551515: C-A-T-C-C-T) was notably increased in all TB patients, including in the PTB and EPTB subgroups, and was significantly associated with the risk of susceptibility to TB. However, no association between the TAP2 gene and TB was found in this study.Conclusion: Host genetic variants of rs41551515-T and the combination rs1057141-T-rs1135216-C, as well as TAP1*unknown_3 may play a critical role in susceptibility to TB disease.Keywords: tuberculosis, association, TAP gene, polymorphism, novel allel
Analysis of clinical indicators in 118 patients with intrauterine adhesions
No full textObjective To explore the differences of different clinical indicators between patients with severe and non-severe intrauterine adhesions （IUA）. Methods Clinical data of 118 patients with IUA diagnosed by hysteroscopy were analyzed retrospectively. According to the AFS scoring standard of IUA, all patients were divided into the severe IUA group （severe group） and mild-moderate IUA group （non-severe group）, and the differences of different clinical indicators between two groups were analyzed. Results Compared with the patients in the non-severe group, the patients in the severe group had more pregnancies, more than two times of uterine curettage, and more times of hysteroscopic resection （all P < 0.05）. There were statistically significant differences between the severe and non-severe groups after induced abortion, hysteroscopic resection, and uterine artery embolization combined with curettage （all P < 0.05）. Among the patients undergoing different times of uterine cavity operations, the difference between the severe and non-severe groups was statistically significant. Compared with the 1-time and 2-time uterine cavity operation groups, the proportion of severe group （85%） in the ≥3-time uterine cavity operation was significantly increased （both P < 0.05）. In the severe group, the proportion of abnormal uterine cavity （heterogenous echoes, continuous interruption, unclear display or adhesion） revealed by transvaginal color Doppler ultrasound was significantly higher than that in the non-severe group （P < 0.05）. Conclusions Induced abortion, hysteroscopic electrosurgery and uterine curettage after uterine artery embolization can increase the risk of IUA. Transvaginal color Doppler ultrasound has good diagnostic value for severe IUA
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