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Search Results: 1 - 10 of 59808 matches for " Long Wei "
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Extended Sequential Truncation Technique for Adaptive Dynamic Programming Based Security-Constrained Unit Commitment with Optimal Power Flow Constraints  [PDF]
Danli Long, Hua Wei
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24092
Abstract: Considering the economics and securities for the operation of a power system, this paper presents a new adaptive dynamic programming approach for security-constrained unit commitment (SCUC) problems. In response to the “curse of dimension” problem of dynamic programming, the approach solves the Bellman’s equation of SCUC approximately by solving a sequence of simplified single stage optimization problems. An extended sequential truncation technique is proposed to explore the state space of the approach, which is superior to traditional sequential truncation in daily cost for unit commitment. Different test cases from 30 to 300 buses over a 24 h horizon are analyzed. Extensive numerical comparisons show that the proposed approach is capable of obtaining the optimal unit commitment schedules without any network and bus voltage violations, and minimizing the operation cost as well.
What Determine the International Competitiveness of Chinese Publishing Industry?  [PDF]
Long Wei, Hui Yang
American Journal of Industrial and Business Management (AJIBM) , 2019, DOI: 10.4236/ajibm.2019.94052
Abstract:
Recent years have witnessed a higher involvement of China’s publishing sector in international market. For the purpose of revealing the dominant factors influencing the international competitiveness of Chinese publishing industry, this paper conducts Gray Relational Analysis to identify certain factors that affect the international competitiveness of China’s publishing industry based on the comparison series and the reference series. The results of empirical analysis indicate that human capital as an advanced factor plays a leading role in the international competitiveness of Chinese publishing industry. Industrial competition obviously affects the scale of China’s publishing industry and its competitiveness. The demand for cultural consumption drives the upgrading of China’s publishing industry, and enhances its international competitiveness. The government’s support facilitates the enhancement of the international competitiveness of Chinese publishing industry. Finally, the author gives some policy suggestions from the perspective of cultural resources, broadening industry chain and governmental conducts.
Investigation of Competitive Advantage of the Dairy Industry Cluster: The Case of Rwanda  [PDF]
Antoine Matemane Mahirwe, Long Wei
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.85092
Abstract: This paper explores the dairy industry cluster in Rwanda and its competitive advantage basing on the Porter’s diamond model. Additionally, this study identifies other factors critical to the competitiveness of the dairy industry cluster in Rwanda and includes them to the diamond model to create a multiple diamond model. This study argues that the direction taken to increase milk supply in Rwanda by increasing the number of cattle farmers through the government program known as “One cow per poor family” is not suitable in that it exerts more pressure on already scarce resources such as land. In fact, this study suggests that given the challenges facing the dairy industry, more emphasis should be put on improving efficiency and increasing productivity in the value chain. This study proposes the multiple-diamond model which extends Porter’s Diamond model to include other factors central to the competitiveness of the dairy industry cluster in Rwanda. To test the effect of the proposed multiple-diamond determinants, ARDL test was run. The findings confirmed the effect of trade openness on the dairy cluster industry competitiveness. Development assistance and milk cattle were found to have a negative and significant effect on the dairy cluster industry competitiveness while FDI inflow and market sophistication were found to have non-significant effect. The study concludes by providing recommendations for future studies in this field.
A New Algorithm for the Acquisition of Knowledge from Scientific Literature in Specific Fields Based on Natural Language Comprehension  [PDF]
Hui Wei, Zhi-long Dai
International Journal of Intelligence Science (IJIS) , 2011, DOI: 10.4236/ijis.2011.12005
Abstract: The acquisition of knowledge and the representation of that acquisition have always been viewed as the bottleneck in the construction of knowledge-based systems. The traditional methods of acquiring knowledge are based on knowledge engineering and communication with field experts. However, these methods cannot produce systematic knowledge effectively, automatically construct knowledge-based systems, or benefit knowledge reasoning. It has been noted that, in specific professional fields, experts often use fixed patterns to describe their expertise in the scientific articles that they publish. Abstracts and conclusions, for example, are key components of the scientific article, containing abundant field knowledge. This paper suggests a method of acquiring production rules from the abstracts and conclusions of scientific articles in specific fields based on natural language comprehension. First, the causal statements in article abstracts and conclusions are extracted using existing techniques, such as text mining. Next, antecedence and consequence fragments are extracted using causal template matching algorithms. As the final step, part-of-speech-tagging production rules are automatically generated according to a syntax parsing tree from the speech pair sequence. Experiments show that this system not only improves the efficiency of knowledge acquisition but also simultaneously generates systematic knowledge and guarantees the accuracy of acquired knowledge.
Current Mathematical Methods Used in QSAR/QSPR Studies
Peixun Liu,Wei Long
International Journal of Molecular Sciences , 2009, DOI: 10.3390/ijms10051978
Abstract: This paper gives an overview of the mathematical methods currently used in quantitative structure-activity/property relationship (QASR/QSPR) studies. Recently, the mathematical methods applied to the regression of QASR/QSPR models are developing very fast, and new methods, such as Gene Expression Programming (GEP), Project Pursuit Regression (PPR) and Local Lazy Regression (LLR) have appeared on the QASR/QSPR stage. At the same time, the earlier methods, including Multiple Linear Regression (MLR), Partial Least Squares (PLS), Neural Networks (NN), Support Vector Machine (SVM) and so on, are being upgraded to improve their performance in QASR/QSPR studies. These new and upgraded methods and algorithms are described in detail, and their advantages and disadvantages are evaluated and discussed, to show their application potential in QASR/QSPR studies in the future.
Existence and asymptotic behavior of solutions for Hénon type equations
Wei Long,Jianfu Yang
Opuscula Mathematica , 2011,
Abstract: This paper is concerned with ground state solutions for the Hénon type equation $-\Delta u(x)=|y|^{\alpha} u^{p-1}(x)$ in $\Omega$, where $\Omega=B^k(0,1)\times B^{n-k}(0,1)\subset \r^n$ and $x=(y,z) \in \r^k imes \r^{n-k}.$ We study the existence of cylindrically symmetric and non-cylindrically symmetric ground state solutions for the problem. We also investigate asymptotic behavior of the ground state solution when $p$ tends to the critical exponent $2^*=\frac {2n}{n-2}$ if $n\geq 3.$
Efficacy of Chinese herbal medicine Mailuo Shutong Granule and Hirudoid cream for chronic venous disorder-induced pigmentation in lower extremities: a prospective, randomized controlled trial
Xiao-long Wei
Zhong Xi Yi Jie He Xue Bao , 2011,
Abstract: Background: Chronic venous disorder (CVD) of the lower extremities generally induces dermatologic complications in lower extremity skin, such as hyperpigmentation. If not treated effectively, the lesions may develop into severe outcomes, including dermal ulcer or necrosis.Objective: To evaluate the clinical efficacy of Mailuo Shutong Granule, a compound traditional Chinese herbal medicine, and Hirudoid cream (heparinoid), in treatment of patients with dermal hyperpigmentation of skin caused by CVD.Design, setting, participants and interventions: A total of 108 CVD outpatients with pigmentation from Department of Vascular Surgery, Shanghai Changhai Hospital were randomly divided into Mailuo Shutong group, Hirudoid group and combined therapy group, with 36 patients in each group. Patients in the Mailuo Shutong group and the Hirudoid group were treated with Mailuo Shutong Granule or Hirudoid cream, respectively, while those in the combined therapy group were treated with Mailuo Shutong Granule plus Hirudoid cream. They were all treated for 28 d.Main outcome measures: Before and after the 28-day treatment, area and average gray value of pigmentation lesions were measured and evaluated.Results: Thirty-three cases in the Mailuo Shutong group, 34 cases in the Hirudoid group and 31 cases in the combined therapy group were included for analysis. After treatment, area of pigmentation decreased and average gray value of pigmentation declined in all the 3 groups (P<0.05). The reductions of area and average gray value in the combined therapy group were more significant than those in the Mailuo Shutong group and Hirudoid group (P<0.05). There were no differences in improvement of pigmentation between the Mailuo Shutong group and Hirudoid group (P>0.05).Conclusion: These data suggest that both Mailuo Shutong Granule and Hirudoid cream can improve CVD-induced hyperpigmentation, and combined treatment of the two drugs results in better clinical efficacy.
Quantization of Light Energy Directly from Classical Electromagnetic Theory in Vacuum
Wei-Long She
Physics , 2005, DOI: 10.1088/1009-1963/14/12/024
Abstract: It is currently believed that light quantum or the quantization of light energy is beyond classical physics and the picture of wave-particle duality, which was criticized by Einstein but attracted a number of experimental researches, is necessary for the description of light. We show in this paper, however, that the quantization of light energy in vacuum, which is the same as that in quantum electrodynamics, can be derived directly from the classical electromagnetic theory through the consideration of statistics based on classical physics. Therefore, the quantization of energy is an intrinsic property of light as a classical electromagnetic wave and has no need of being related to particles.
Maximum work for Carnot-like heat engines with infinite heat source
Rui Long,Wei Liu
Physics , 2014,
Abstract: An analysis of efficiency and its bounds at maximum work output for Carnot-like heat engines is conducted. The heat transfer processes are described by the linear law with time-dependent heat conductance. The upper bound of efficiency is found to be the CA efficiency,and is independent of the time duration completing each process and the time-dependent conductance. We prove that even the working medium exchanges heat sufficiently with the heat reservoirs, the work which could be extracted is finite and limited. The optimal temperature profiles in the heat exchanging processes are also analyzed. When the dimensionless contact times satisfy certain relations,the endoreversible model is recovered.
A Note to Article "Quantization of Light Energy Directly from Classical Electromagnetic Theory in Vacuum"
Wei-Long She
Physics , 2006,
Abstract: Very recently we present a theory [Wei-long She, Chin. Phys. 14, 2514(2005); Online: http://www.jop.org/journals/cp; http://arxiv.org/abs/quant-ph/0512097] to show that the quantization of light energy in vacuum can be derived directly from classical electromagnetic theory through the consideration of statistics based on classical physics and reveal that the quantization of energy is an intrinsic property of light as a classical electromagnetic wave and has no need of being related to particles. In this theory a key concept of stability of statistical distribution was involved. Here is a note to the theory, which would be helpful for understanding the concept of stability of statistical distribution.
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