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Search Results: 1 - 10 of 127179 matches for " WANG Lei "
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Hierarchical Hypercube Based Pairwise Key Establishment Scheme for Sensor Networks  [PDF]
Lei WANG
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.22016
Abstract: Security schemes of pairwise key establishment, which enable sensors to communicate with each other se-curely, play a fundamental role in research on security issue in wireless sensor networks. A general frame-work for key predistribution is presented, based on the idea of KDC (Key Distribution Center) and polyno-mial pool schemes. By utilizing nice properties of H2 (Hierarchical Hypercube) model, a new security mechanism for key predistribution based on such model is also proposed. Furthermore, the working per-formance of tolerance resistance is seriously inspected in this paper. Theoretic analysis and experimental fig-ures show that the algorithm addressed in this paper has better performance and provides higher possibilities for sensor to establish pairwise key, compared with previous related works.
Partial Feedback Based Orthogonal Space-Time Block Coding With Flexible Feedback Bits  [PDF]
Lei Wang, Zhigang Chen
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2024
Abstract: The conventional orthogonal space-time block code (OSTBC) with limited feedback has fixed p-1 feedback bits for the specific ntp transmit antennas. A new partial feedback based OSTBC which provides flexible feedback bits is proposed in this paper. The proposed scheme inherits the properties of having a simple decoder and the full diversity of OSTBC, moreover, preserves full data rate. Simulation results show that for ntp transmit antennas, the proposed scheme has the similar performance with the conventional one by using p-1 feedback bits, whereas has the better performance with more feedback bits.
Expression of Telomerase Reverse Transcriptase during the Malignant Transformation of Cadmium-Induced Cells  [PDF]
Min Wang, Yixiong Lei
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.22018
Abstract: The objective of the present study was to investigate human telomerase reverse transcriptase (hTERT) mRNA and protein expressions during the cadmium chloride-induced malignant transformation of human bronchial epithelial (16HBE) cells. Fluorescence quantitative PCR (FQ-PCR) and Western blot analyses were performed to detect the hTERT mRNA and protein expressions in normal 16HBE cells, cadmium chloride-transformed 16HBE cells, and tumorigenic cells from nude mice inoculated with cadmium chloride-transformed 16HBE cells. Under the inner standard of GAPDH, the hTERT mRNA expression was significantly higher at different stages of malignant transformation (cadmium chloride-transformed 16HBE cells at passages 15 and 35 and tumorigenic cells from nude mice) than in normal 16HBE cells, and increased with the development of malignancy (P < 0.01). In addition, hTERT protein expression increased with the development of malignancy. These findings demonstrate that hTERT expression is related to cadmium chlorideinduced malignant transformation. Cadmium chloride-induced malignant transformation is involved in changes in the hTERT activity, and might be an early event in cadmium chloride-induced malignant transformation.
Mapping It out: A Novel Signaling Pathway Linking Aβ-PrPc-Fyn Complex to Cognitive Impairment in Alzheimer’s Disease  [PDF]
Yiling Wang, Lei Xue
Advances in Alzheimer's Disease (AAD) , 2014, DOI: 10.4236/aad.2014.31003
Abstract: Understanding the signaling cascade that leads to the rapid memory and cognitive breakdown in Alzheimer’s disease is the key to finding a potential treatment method for the disease. Recently, Larson et al. connect the roles of major proteins implicated in the disease progression and propose targeting of cellular prion protein (PrPc) as a way of someday rescuing synaptic plasticity in humans with Alzheimer’s, as it has been done on mice.


A Study on the Status Quo of Chinese College Students’ Intercultural Communication Competence  [PDF]
Lei Chen, Zhihui Wang
Chinese Studies (ChnStd) , 2018, DOI: 10.4236/chnstd.2018.72014
Abstract: Intercultural encounters have become a fact of daily life in so many cities as well as towns in China, yet English learning is far from enough for cultivating talents with international vision and research on ICC has stepped on agenda. This paper is aimed at investigating the ICC stat quo of Chinese college students. The questionnaire is designed based on Byram’s YOGA including four aspects—intercultural knowledge, intercultural skills, intercultural attitude, and critical intercultural awareness. Research is done with data from the teacher-questionnaire for finding one focus of the four aspects for further research of influencing factors of ICC and with data from the student-questionnaire, on the presumed potential related factors of ICC like major, gender, cultural curriculums, and experience abroad for finding out Chinese college students’ ICC stat quo. 10 (half science and half literary arts) are interviewed to find out how the results come into being. Through the analysis of teacher-questionnaire data, the author gets that intercultural attitude is of the most importance to ICC. The results come out possibly because the acquiring of intercultural awareness, intercultural skills and intercultural knowledge are decided by intercultural attitude.
Research on Agri-Food Cold Chain Logistics Management System: Connotation, Structure and Operational Mechanism  [PDF]
Jiuyi An, Lei Wang, Xiaohua Lv
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.86090
Abstract: Along with the demand of development, this paper will define agri-food cold chain logistics management system. It is a general term of management system, organization system, standard system, running mechanism, etc. According to the activities and characters of agri-food cold chain logistics, the content of agri-food cold chain logistics management system includes three levels of management activities. There are macro management and part of the industry management of the government-led agricultural cold chain logistics activity, industry management of industry association as the main body, and micro enterprise operation management of enterprise as the main body. In addition, this paper will draw lessons from the city of agricultural products cold chain logistics management experience in the international, the main behavior of the logistics market, strengthen monitoring and early warning, strengthen the whole process, and make market access strictly and other key links have to be closely surrounded. Through improving agricultural products cold chain logistics management laws and regulations system, standard system, management system, testing system, certification system, technology supporting system, information service system, and establishing emergency mechanism and other agricultural products cold chain logistics security support system, government, industry, consumers, media, education and scientific research institutions and other relevant parties can take many aspects, many angles, many levels mutually supporting measures, in order to establish and improve the agricultural products cold chain logistics safety control system, and establish the whole process control system from farm to table, to ensure the safety of agricultural products cold chain logistics.
An Optimal Algorithm for Prufer Codes  [PDF]
Xiaodong Wang, Lei Wang, Yingjie Wu
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.22016
Abstract: This paper studies the algorithms for coding and decoding Prufer codes of a labeled tree. The algorithms for coding and decoding Prufer codes of a labeled tree in the literatures require time usually. Although there exist linear time algorithms for Prufer-like codes [1,2,3], the algorithms utilize the integer sorting algorithms. The special range of the integers to be sorted is utilized to obtain a linear time integer sorting algorithm. The Prufer code problem is reduced to integer sorting. In this paper we consider the Prufer code problem in a different angle and a more direct manner. We start from a naïve algorithm, then improved it gradually and finally we obtain a very practical linear time algorithm. The techniques we used in this paper are of interest in their own right.
Entanglement and Closest Product States of Graph States with 9 to 11 Qubits  [PDF]
Cuifeng Wang, Lizhen Jiang, Lei Wang
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.14010
Abstract:

The numbers of local complimentary inequivalent graph states for 9, 10 and 11 qubit systems are 440, 3132, 40457, respectively. We calculate the entanglement, the lower and upper bounds of the entanglement and obtain the closest product states for all these graph states. New patterns of closest product states are analyzed.

Modelling and Regularity of Nonlinear Impulsive Switching Dynamical System in Fed-Batch Culture
Lei Wang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/295627
Abstract: A hybrid system with state-based switchings is proposed to describe the fed-batch production of 1,3-propandiol from glycerol in our previous work. However, the on-off switching of alkali is too frequent, which greatly increases the computational cost of the numerical solution to the system so as to locate the state-based switchings in strict time order and implement the correct mode changes. To deal with this problem, we consider the switching of alkali pump as an impulsive event and present a nonlinear impulsive switching system to describe the fed-batch culture. It is proved that the impulsive switching system is non-Zeno. Some basic properties of solutions to the impulsive switching system are also explored. In order to overcome the discontinuities of the system, the Skorohod topology is induced and a specific form of λ is constructed to prove the main theorem. Additionally, a numerical simulation is carried out to show that the proposed system can describe the fed-batch culture properly and the essential difference with the previous work.
A Legal Analysis of Financial Leasing
Lei WANG
Cross-Cultural Communication , 2011, DOI: 10.3968/1606
Abstract: This paper aims at providing a theoretical analysis of international financial leasing and discusses some controversial issues within this area. Accordingly, it is divided into three main parts. The first part of the essay probes into the definition and fundamental features of international financial leasing. Then the second part focuses on certain debatable issues in the practice field of international financial leasing. The last part of the essay aims at providing a little analysis of the UNIDROIT Convention on International financial leasing which may be of some help to know the development of international financial leasing. This part mainly discusses rights and obligations of each party of an International financial leasing contract and particular remedies of breach of contract. Then, the conclusion provides some future perspectives of international financial leasing. Key words: UNIDROIT Convention; International Financial Leasing; Private Law Resumé: Cet article vise à fournir une analyse théorique de crédit-bail international et examine certaines questions controversées dans ce domaine. En conséquence, il est divisé en trois parties principales. La première partie de l'essai sonde dans la définition et les caractéristiques fondamentales de crédit-bail international. Puis la deuxième partie se concentre sur certains points discutables dans le domaine de la pratique du crédit-bail international. La dernière partie de l'essai vise à fournir une petite analyses sur la Convention d'UNIDROIT de crédit-bail qui peut être utile pour conna tre le développement du crédit-bail international. Cette partie traite essentiellement des droits et obligations de chaque partie d'un contrat de crédit-bail international et des solutions spécifiques de rupture de contrat. Ensuite, la conclusion donne quelques perspectives d'avenir de crédit-bail international. Mots-clés: Convention d'Unidroit; CréDit-Bail International; Droit Privé
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