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Search Results: 1 - 10 of 2231 matches for " Liaojun Pang "
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Quantum Attack-Resistent Certificateless Multi-Receiver Signcryption Scheme
Huixian Li, Xubao Chen, Liaojun Pang, Weisong Shi
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0049141
Abstract: The existing certificateless signcryption schemes were designed mainly based on the traditional public key cryptography, in which the security relies on the hard problems, such as factor decomposition and discrete logarithm. However, these problems will be easily solved by the quantum computing. So the existing certificateless signcryption schemes are vulnerable to the quantum attack. Multivariate public key cryptography (MPKC), which can resist the quantum attack, is one of the alternative solutions to guarantee the security of communications in the post-quantum age. Motivated by these concerns, we proposed a new construction of the certificateless multi-receiver signcryption scheme (CLMSC) based on MPKC. The new scheme inherits the security of MPKC, which can withstand the quantum attack. Multivariate quadratic polynomial operations, which have lower computation complexity than bilinear pairing operations, are employed in signcrypting a message for a certain number of receivers in our scheme. Security analysis shows that our scheme is a secure MPKC-based scheme. We proved its security under the hardness of the Multivariate Quadratic (MQ) problem and its unforgeability under the Isomorphism of Polynomials (IP) assumption in the random oracle model. The analysis results show that our scheme also has the security properties of non-repudiation, perfect forward secrecy, perfect backward secrecy and public verifiability. Compared with the existing schemes in terms of computation complexity and ciphertext length, our scheme is more efficient, which makes it suitable for terminals with low computation capacity like smart cards.
Variance Window Based Car License Plate Localization  [PDF]
Jing Pang
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.29009
Abstract:

In this paper, a new method for discovering the candidate car license plate locations is presented. First, the image is decomposed using a Haar wavelet to get the HL band with vertical edges. Then, the HL band image is binarized using an Otsu threshold. Next a black top-hat algorithm is applied to reduce the effects of interfering large continuous features other than the license plate. At this time, a moving window based modified variance score calculation is made for areas with white pixels. This work found that the top 3 detected rectangle windows correctly locate the license plate regions with a success rate of about 98.2%. Moreover, the proposed method is robust enough to locate the plates in cases where the rough vehicle position has not been previously discovered and the cars are not centered in the image.

Research and Practice on the Cultivation of Engineering Competence for Software Talents in Universities  [PDF]
Xiyu Pang
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.32020
Abstract: This paper analyzes the phenomenon that companies are in need of talents, yet students have difficulty in finding jobs. It proposes new solutions for “Bridging the gap between university education and social demand and cultivating qualified talents for software companies”, that is, to cultivate the students’ competence for software engineering in curriculum design. Besides, it gives a scheme for cultivating the students’ competence for software engineering in curriculum design, and delivers good results in practice.
BACK ANALYSIS OF COEFFICIENT TENSOR OF PERMEABILITY FOR FRACTURED ROCK MASS
裂隙岩体渗透系数张量的反演分析

Zhu Yueming,Zhang Liaojun,Wu Yin,
朱岳明
,张燎军,吴 忄音

岩石力学与工程学报 , 1997,
Abstract: The fractured rock masses are considered as non homogeneous and anisotropic permeable media. The optimal fitting for calculated and measured water level and seepage discharge of measuring points is made. The reverse problem to identify the coefficient tensors of permeability of the rock masses is transformed into an equivalent mathematical minimizing problem. To improve the convergence of iterative calculation, an effective term for penalty is added to the expression of the minimum optimization function. Hereby, the solution to three dimensional complicated reverse problems can directly be obtained on computer. Finally, the solution of a complicated practical example is presented in detail.
Community Analysis of Social Network in MMOG  [PDF]
Sheng PANG, Changjia CHEN
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.32020
Abstract: Massive Multiplayer Online Games (MMOG) have attracted millions of players in recent years. In MMOG, players organize themselves voluntarily and fulfill collective tasks together. Because each player can join different activities, one player may show different social relationship with others in different activities. In the paper we proposed the incremental label propagation algorithm to search the cliques accurately and quickly. Then we analyzed community structure characteristics on multi-activities. It's shown that the existing guild organization cannot satisfy the requirements of multi-activities in MMOG, which motivates us to devise new community communication channels and platforms in future.
The wave-corpuscle properties of microscopic particlesin the nonlinear quantum-mechanical systems  [PDF]
Xiao-feng Pang
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.37083
Abstract: We debate first the properties of quantum mechanics and its difficulties and the reasons resulting in these diffuculties and its direction of development. The fundamental principles of nonlinear quantum mechanics are proposed and established based on these shortcomings of quantum mechanics and real motions and interactions of microscopic particles and backgound field in physical systems. Subsequently, the motion laws and wave-corpuscle duality of microscopic particles described by nonlinear Schr?dinger equation are studied completely in detail using these elementary principles and theories. Concretely speaking, we investigate the wave-particle duality of the solution of the nonlinear Schr?dinger equation, the mechanism and rules of particle collision and the uncertainty relation of particle’s momentum and position, and so on. We obtained that the microscopic particles obey the classical rules of collision of motion and satisfy the minimum uncertainty relation of position and momentum, etc. From these studies we see clearly that the moved rules and features of microscopic particle in nonlinear quantum mechanics is different from those in linear quantum mechanics. Therefore, nolinear quantum mechanics is a necessary result of development of quantum mechanics and represents correctly the properties of microscopic particles in nonlinear systems, which can solve difficulties and problems disputed for about a century by scientists in linear quantum mechanics field.
The Physical and Biological Properties of NanoTiO2 Material  [PDF]
Xiao Feng Pang
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27125
Abstract: The physical and biological properties of TiO2 materials including nano TiO2, micrometer-TiO2 and nano TiO2 tubes have been studied using scanning electron and infrared spectrometer, X-ray diffraction instrument as well as 3-(4,5- dimethylthiazol 2-yl)-2,5 diphenyltetrazolium bromide (MTT) colorimetric method, respectively. These materials are prepared by chemical deposition and anode oxidation methods, respectively. The sizes of nano TiO2 are 80 nm and 1000 nm, respectively, their infrared properties of absorption are different, the characteristic peaks of the former are 1271,1615, 2957 and 3422 cm-1, the latter are 1645 and 2356 cm-1. The nano TiO2 tubes can be formed by anode oxidation method, its diameters are between 50-100 nm, different nano TiO2 tubes contain different components of oxygen and titanium. In MTT experiment we discover the changes of properties of proliferation of the liver and chick embryo fibroblast cells under influences of nanoTiO2 relative to those of the controlled groups, when small nanoTiO2 suspension is added in these cultivated liquids of cell, but the influence of nano TiO2 on the proliferation of the person’s liver cell is still very small, therefore, the toxicities of nano TiO2 containing 80nm and 1000 nm to these cells are still first score.
Reviewing the trends of nursing doctoral thesis research in Hong Kong  [PDF]
Yingchun Zeng, Samantha Pang
Open Journal of Nursing (OJN) , 2012, DOI: 10.4236/ojn.2012.24051
Abstract: This review aimed to analyze the trends and contributions of nursing doctoral theses produced in Hong Kong. A total of 56 nursing doctoral theses were included in this review. The most often studied topic was cardiovascular rehabilitation care (n = 9, 16%). More recently, the most often studied topics has been health technology advancements in nursing care (n = 6, 10.7%). The common trend of study methods was to be quantitative in nature. Of the total, 35 out of 56 were quantitative studies. Half were experimental/ quasi-experimental research studies (n = 28, 50%). For theoretical foundations or applications, the majority (n = 21, 36%) of doctoral theses had no specific theoretical/conceptual models as study frameworks. This trend indicates that there is space for improving the theoretical and philosophical foundation of nursing research in Hong Kong. For the contributions of doctoral thesis research, Hong Kong nursing scholars place more emphasis on direct enhancement of clinical practice or the improvement of patient outcomes. This review provides concrete evidence of the status of nursing research and knowledge development in Hong Kong nursing.
Variability of Sand Mobility Surrounding Cylinder Object Freely Resting on the Seabed under the Action of Typhoon  [PDF]
Chongguang Pang, Liqian Liu
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.57062
Abstract:

In sandy sediments, scour and fill is the key process contributed to mine burial. The scour processes surrounding the cylinder mines freely resting on the sandy seabed under the 12-hr combined action of tidal currents and wind-generated waves, especially over typhoon events are numerically simulated using the DRAMBUIE model. The East China Sea is a good case study due to the dominant impact of summer typhoon events on sediment transport and scour. The numerical results show that the scour depth generally increases with time under the combined current and wave stresses exerted on the seabed, while the depth of the scour pit depends on infill once the currents subside. There is a positive relationship between the scour depth and the bottom orbital velocity after experiencing 12-hr wave action including storm waves, while the relation is not linear. The experimental results also display an elevated trend for scour depth with the increase of orbital velocity. The numerical results reveal a surprising phenomenon: the mobility of sand altering with the increasing bed shear stress larger than the certain threshold, which is also manifested as the curves of scour depth with the different grain size might cross each other. For laboratory experiments, the variability of sand mobility does not occur, likely because typhoon storm waves cannot be reproduced in the flume. More numerical tests indicate that the intersection will be triggered by the division of critical Shields parameter. The preliminary analysis suggests that the phenomenon never documented is likely generated from the error of empirical formulae.

A Study on Credit Appraisal System of C2C E-Commerce
—Based on the Analysis of Taobao
 [PDF]

Jiangang Pang, Zhiying Liu
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.412078
Abstract: In the virtual network environment, the C2C e-commerce has some problems in product quality, service, credit speculation. At present the credit appraisal system offered by domestic C2C e-commerce website ensures the network security to a certain extent while it has some problems in identity verification, evaluation rules and model, credit of buyers and sellers and so on. Focused on the largest national C2C shopping website—Taobao, this article mainly analyzes the present situations and problems of the credit appraisal system, puts forward some improved suggestions of the real-name authentication, credit and transaction appraisal rules and so forth, and then establishes improved credit appraisal system.
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