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Search Results: 1 - 10 of 185455 matches for " Li Chen "
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Combining Keyword Search Advertisement and Site- Targeted Advertisement in Search Engine Advertising  [PDF]
Li Chen
Journal of Service Science and Management (JSSM) , 2008, DOI: 10.4236/jssm.2008.13025
Abstract: Internet advertising has seen a strong growth in recent years and search engine advertising has played an important role in that growth. Search engines continue to expand their business by providing new options of advertising. For ex-ample, Google provides a new advertisement mechanism based on cost-per-thousand-impression (CPM) payment called “site-targeted advertisement” in addition to the famous “keyword search advertisement” based on cost-per-click (CPC). While keyword search advertisement is a cost-efficient way of advertising, site-targeted advertisement provides a quicker alternative to expose the ad to a mass population at a higher expense. This paper studies a mixed strategy of optimization by combining these mechanisms to exploit their corresponding advantages. We set up a general model to find optimal starting and ending times for both methods. Closed-form solutions are calculated for two applications: (1) Advertising of perishable information with click-based revenue only; and (2) Site-targeted advertisement first and key-word search advertisement last. Comparative static analysis provides an analysis of properties of each application. We also develop a computational experiment based on Google AdWords to illustrate the application of the model.
A Review of Research on Whistle-Blowing  [PDF]
Li Chen
American Journal of Industrial and Business Management (AJIBM) , 2019, DOI: 10.4236/ajibm.2019.92019
Abstract: The whistle-blowing behavior in the organization is an employee’s whis-tle-blowing on the illegal, destructive rules and unethical behaviors in the workplace, and is an effective mechanism to timely correct non-ethical behaviors in the organization. The article reviews the research origin, concept and measurement methods of whistle-blowing behaviors, discusses the decision-making process of whistle-blowing behavior from different theoretical perspectives, and systematically sorts out the influencing factors and generating mechanisms of whistle-blowing intention or behavior from multiple levels. Proposing future research should focus on issues such as localized whistle-blowing behavior, the impact of different context variables, and longitudinal research on whistle-blowing behavior.
Intelligent Optimization Methods for High-Dimensional Data Classification for Support Vector Machines  [PDF]
Sheng Ding, Li Chen
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.26043
Abstract: Support vector machine (SVM) is a popular pattern classification method with many application areas. SVM shows its outstanding performance in high-dimensional data classification. In the process of classification, SVM kernel parameter setting during the SVM training procedure, along with the feature selection significantly influences the classification accuracy. This paper proposes two novel intelligent optimization methods, which simultaneously determines the parameter values while discovering a subset of features to increase SVM classification accuracy. The study focuses on two evolutionary computing approaches to optimize the parameters of SVM: particle swarm optimization (PSO) and genetic algorithm (GA). And we combine above the two intelligent optimization methods with SVM to choose appropriate subset features and SVM parameters, which are termed GA-FSSVM (Genetic Algorithm-Feature Selection Support Vector Machines) and PSO-FSSVM(Particle Swarm Optimization-Feature Selection Support Vector Machines) models. Experimental results demonstrate that the classification accuracy by our proposed methods outperforms traditional grid search approach and many other approaches. Moreover, the result indicates that PSO-FSSVM can obtain higher classification accuracy than GA-FSSVM classification for hyperspectral data.
The Transmission of Pricing Information of Dually-Listed between Hong Kong and New York Stock Exchange  [PDF]
Shuangfei LI, Shou CHEN
Journal of Service Science and Management (JSSM) , 2009, DOI: 10.4236/jssm.2009.24041
Abstract: The study investigates the transmission of pricing information between Hong Kong Stock Exchange and New York Stock Exchange. Using the opening and closing stock prices of these two markets from Jan. 2003 to Apr. 2007 with the method of Seemingly Unrelated Regression, we draw the conclusions that: 1) intraday returns of Chinese dually-listed stocks is influenced more obviously by Hang Seng Index than Dow-Jones Average; 2) transmission of pricing information is only from New York to Hong Kong; 3) intraday returns of stocks from New York Stock Exchange has a remarkable influence on that of the next day in Hongkong market, but the stocks price of Hong Kong Stock Exchange has no relation with which of New York Stock Exchange.
An Energy-Efficient Access Control Algorithm with Cross-Layer Optimization in Wireless Sensor Networks  [PDF]
Zhi Chen, Shaoqian Li
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.22022
Abstract: This paper presents a wireless sensor network (WSN) access control algorithm designed to minimize WSN node energy consumption. Based on slotted ALOHA protocol, this algorithm incorporates the power control of physical layer, the transmitting probability of medium access control (MAC) layer, and the automatic repeat request (ARQ) of link layer. In this algorithm, a cross-layer optimization is preformed to minimizing the energy consuming per bit. Through theory deducing, the transmitting probability and transmitting power level is determined, and the relationship between energy consuming per bit and throughput per node is provided. Analytical results show that the cross-layer algorithm results in a significant energy savings relative to layered design subject to the same throughput per node, and the energy saving is extraordinary in the low throughput region.
A Study of γ-Fe2O3 Nanoparticles Modified Using ZnCl2 during Synthesis  [PDF]
Longlong Chen, Jian Li
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.31A004

Surface modification of γ-Fe2O3 nanoparticles synthesized by a chemically induced transition has been attempted by adding ZnCl2 during synthesis. The structure of the modified particles was studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The experimental results showed that ZnFe2O4 grew epitaxially on the γ- Fe2O3 crystallites to form composite nanoparticles with the spinel structure, on which FeCl3 might be adsorbed. The apparent grain size dc estimated by XRD using the Scherrer equation was larger rather than smaller than the average particle size measured by TEM. This paradox can be explained by the effect of absorption in the coating heterolayer.

Just-In-Time Hypermedia  [PDF]
Zong Chen, Li Zhang
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.65B007
Abstract: Many analytical or computational applications create documents and display screens in response to user queries “dynamically” or in “real time”. Hypermedia features must be generated “just in time” – automatically and dynamically. Conversely, the hypermedia features may have to cause target documents to be generated or re-generated. This paper presents a just-in-time hypermedia framework to provide hypermedia support of virtual documents.
Vibration Analysis of Steel Strip in Continuous Hot-Dip Galvanizing Process  [PDF]
Peng Li, Han Chen
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.16007

In hot-dip galvanizing lines, undesirable vibration of the moving steel strip occurs due to the impingement of the high-speed turbulence jet, which leads to non-uniformity of zinc thickness, as well as splash of the liquid zinc. In this paper, the turbulent jet flow field is firstly numerically obtained using the CFD method. Then, the influence of the turbulent jet flow on the steel strip is simplified as a harmonic force at the impingement line, and the response of the steel strip is obtained by means of finite element analysis for different strip lengths, thickness and pretension forces. Influences of impingement distance, air knife slot gap and jet pressure, on vibration of the steel strip are also analyzed. The results will provide theoretical basis for the reduction of steel strip vibration in continuous hot-dip galvanizing process.

Analysis of Switching Overvoltage in Regional Grid with Small Hydropower Plants  [PDF]
Juan Chen, Haifeng Li
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.59B004
Abstract: Present-day small hydropower plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation, therefore, there are many SHPs in places of China where are rich in water resources. However, it has caused overvoltages in the distribution network, and which is even worse for the switching overvoltage such as isolated network operation, changing power supply path. The simple network model is used to analyze the reasons of the switching overvoltage, and the simulation software DIgSILENT/PowerFactory is used to check out the results of the theoretical analysis.
The Investigation and Analysis of Teachers’ Involvement in Students’ Autonomous Learning  [PDF]
Chen Guan, Feipeng Li
Open Journal of Modern Linguistics (OJML) , 2014, DOI: 10.4236/ojml.2014.44044
Abstract: The cultivation of students’ autonomous learning ability is one of the important sections of English teaching reform at college in China. However, it doesn’t mean that teachers’ involvement is becoming less and less necessary; instead, teachers’ involvement is significant and indispensable to guarantee and promote learner autonomy. This paper firstly introduces the basic concept of students’ autonomous learning and teachers’ involvement briefly. Then, it analyzes the statistics of the questionnaire about teachers’ involvement in Baoding University. Finally, this paper illustrates the different roles that teachers should play in and after class with the reference of questionnaire data discussed above. Hopefully, this paper may have some enlightment for teachers’ involvement in students’ autonomous learning.
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