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Search Results: 1 - 10 of 14500 matches for " Linlin Shen "
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Information Theory for Gabor Feature Selection for Face Recognition
Shen Linlin,Bai Li
EURASIP Journal on Advances in Signal Processing , 2006,
Abstract: A discriminative and robust feature—kernel enhanced informative Gabor feature—is proposed in this paper for face recognition. Mutual information is applied to select a set of informative and nonredundant Gabor features, which are then further enhanced by kernel methods for recognition. Compared with one of the top performing methods in the 2004 Face Verification Competition (FVC2004), our methods demonstrate a clear advantage over existing methods in accuracy, computation efficiency, and memory cost. The proposed method has been fully tested on the FERET database using the FERET evaluation protocol. Significant improvements on three of the test data sets are observed. Compared with the classical Gabor wavelet-based approaches using a huge number of features, our method requires less than 4 milliseconds to retrieve a few hundreds of features. Due to the substantially reduced feature dimension, only 4 seconds are required to recognize 200 face images. The paper also unified different Gabor filter definitions and proposed a training sample generation algorithm to reduce the effects caused by unbalanced number of samples available in different classes.
Research on Service Pattern of Storing Local Government Information into University Libraries in Big Data Age  [PDF]
Linlin Zhang
Journal of Service Science and Management (JSSM) , 2016, DOI: 10.4236/jssm.2016.91007
Abstract: Under the big data environment, this paper proposes the system building pattern and effective service strategy of storing government information into university libraries. The local government information can be better co-built and shared by establishing the guarantee institution for government information storage at university library and effectively integrating the government information resources, and providing diversified services of local government information to the public.
Investigation and Analysis on DRS Condition of Agricultural University Libraries in China  [PDF]
Linlin Zhang
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.42003
Abstract: 31 investigated higher agricultural college libraries all provide the reference consulting service. The service mode includes asynchronous reference consulting, synchronous reference consulting, synchronous and asynchronous reference consulting, joint reference consulting service and traditional reference consulting service. Service items include interlibrary borrowing and document delivery, reader training, special database, resource navigation and so on. But there are some problems to be solved.
Discussion on Subject Knowledge Service Pattern of Agricultural University Libraries  [PDF]
Linlin Zhang
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.41004
Abstract: Taking Heilongjiang Bayi Agricultural University as an example, the discipline service practice was explored from the aspects such as free network resources and tool use, subject navigation, subject librarians, information sharing space and information literacy education. The typical cases were provided; the optimization of utilization method of network resources was put forward; the subject theme navigation was developed; and the information sharing space of specific discipline and other working strategies were carried out. The experience and enlightenment of active service for subject construction, priority service for key subjects, subject service by lay and step and seizing of the opportunity of subject service were summarized, which developed ideas and provided reference to the establishment of deep subject services of general libraries of colleges and universities.
Embedded Palmprint Recognition System Using OMAP 3530
Linlin Shen,Shipei Wu,Songhao Zheng,Zhen Ji
Sensors , 2012, DOI: 10.3390/s120201482
Abstract: We have proposed in this paper an embedded palmprint recognition system using the dual-core OMAP 3530 platform. An improved algorithm based on palm code was proposed first. In this method, a Gabor wavelet is first convolved with the palmprint image to produce a response image, where local binary patterns are then applied to code the relation among the magnitude of wavelet response at the ccentral pixel with that of its neighbors. The method is fully tested using the public PolyU palmprint database. While palm code achieves only about 89% accuracy, over 96% accuracy is achieved by the proposed G-LBP approach. The proposed algorithm was then deployed to the DSP processor of OMAP 3530 and work together with the ARM processor for feature extraction. When complicated algorithms run on the DSP processor, the ARM processor can focus on image capture, user interface and peripheral control. Integrated with an image sensing module and central processing board, the designed device can achieve accurate and real time performance.
An efficient and recyclable iron(III)-containing imidazolium salt catalyst for cross-coupling of aryl Grignard reagents with alkyl halides
ChunHui Yan,LinLin Wang,HuanHuan Gao,HongMei Sun,Qi Shen
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-011-4660-3
Abstract: 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, [DIPrim]Cl, was used to produce a novel iron(III)-containing imidazolium salt [DIPrim][FeCl4], which included a N,N-diarylimidazolium cation (R = 2,6-diisopropylphenyl), [DIPrim]+, and tetrachloroferrate(III) anion, [FeCl4] . This compound was an effective and easy-to-use catalyst for the cross-coupling of aryl Grignard reagents with primary and secondary alkyl halides bearing β-hydrogens. After simply decanting the cross-coupling product in the ether layer, [DIPrim][FeCl4] could be reused in at least four successive runs without significant loss of catalytic activity.
LOAD: Local Orientation Adaptive Descriptor for Texture and Material Classification
Xianbiao Qi,Guoying Zhao,Linlin Shen,Qingquan Li,Matti Pietikainen
Computer Science , 2015,
Abstract: In this paper, we propose a novel local feature, called Local Orientation Adaptive Descriptor (LOAD), to capture regional texture in an image. In LOAD, we proposed to define point description on an Adaptive Coordinate System (ACS), adopt a binary sequence descriptor to capture relationships between one point and its neighbors and use multi-scale strategy to enhance the discriminative power of the descriptor. The proposed LOAD enjoys not only discriminative power to capture the texture information, but also has strong robustness to illumination variation and image rotation. Extensive experiments on benchmark data sets of texture classification and real-world material recognition show that the proposed LOAD yields the state-of-the-art performance. It is worth to mention that we achieve a 65.4\% classification accuracy-- which is, to the best of our knowledge, the highest record by far --on Flickr Material Database by using a single feature. Moreover, by combining LOAD with the feature extracted by Convolutional Neural Networks (CNN), we obtain significantly better performance than both the LOAD and CNN. This result confirms that the LOAD is complementary to the learning-based features.
The BeiHang Keystroke Dynamics Authentication System
Juan Liu,Baochang Zhang,Linlin Shen,Jianzhuang Liu,Jason Zhao
Computer Science , 2013,
Abstract: Keystroke Dynamics is an important biometric solution for person authentication. Based upon keystroke dynamics, this paper designs an embedded password protection device, develops an online system, collects two public databases for promoting the research on keystroke authentication, exploits the Gabor filter bank to characterize keystroke dynamics, and provides benchmark results of three popular classification algorithms, one-class support vector machine, Gaussian classifier, and nearest neighbour classifier.
Exploring the Determinants of Community Engagement in Social Q & A Communities  [PDF]
Linlin Zhang, Yongwei Jiang
Journal of Service Science and Management (JSSM) , 2018, DOI: 10.4236/jssm.2018.112015
Abstract: Based on group identity and interpersonal bonds, this study constructs a theoretical framework to explain the influence mechanism of community engagement in social Q & A community users. According to the data received from 402 users of social Q & A community, this study empirically tested the proposed model. The results of structural equation modeling (SEM) showed that community identification is the antecedent of community engagement. And community identification plays a mediating role in the impact of perceived online relationship commitment on community engagement. Community prestige has a positive impact on community identification, and social presence and familiarity has a positive impact on the perceived online relationship commitment.
Upregulation of Protein Phosphatase 2A and NR3A-Pleiotropic Effect of Simvastatin on Ischemic Stroke Rats
Minxia Zhu, Jin Wang, Min Liu, Dongshu Du, Chunmei Xia, Linlin Shen, Danian Zhu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0051552
Abstract: Ca2+ influxes are regulated by the functional state of N-methyl-D-aspartate receptors (NMDARs). Dephosphorylation of NMDARs subunits decreases Ca2+ influxes. NR3, a novel subunit of NMDARs, also decreases Ca2+ influxes by forming new NMDARs with NR1 and NR2. It is meaningful to uncover whether protein phosphatase 2A (PP2A) and NR3A play a role in the protective effect of Simvastatin on ischemic stroke. In the present study, the Sprague-Dawley rats were pretreated with Simvastatin for 7 days before middle cerebral artery occlusion was performed to mimic ischemic stroke. The results showed that Simvastatin decreased brain ischemic infarct area significantly while increasing the expression levels of PP2A and NR3A, thus dephosphorylating the serine sites of NR1 (ser896 and ser897) along with increased enzymatic activities of PP2A. The protein levels of NR3A decreased as the enzymatic activities of PP2A were inhibited by okadaic acid. The results indicated that Simvastatin could protect the cerebrum from ischemic injury through a signaling mechanism involving elevated levels of PP2A and NR3A, and that PP2A might involve in the regulatory mechanism of NR3A expression.
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