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Search Results: 1 - 10 of 4463 matches for " Yihong Ru "
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Improved Adaptive and Multi-group Parallel Genetic Algorithm Based on Good-point Set
Ruijiang Wang,Yihong Ru,Qi Long
Journal of Software , 2009, DOI: 10.4304/jsw.4.4.348-356
Abstract: This paper puts forward an adaptive genetic algorithm to solve the multi-group homogenization in the solution space. The use of good-point set approach improves the initial population, ensuring them a uniform distribution in the solution space. In the evolution, each population implements independent genetic operations (selection, good-point set crossover, and mutation). The introduction of adaptive operator makes crossover and mutation operator self-adaptive. As the algorithm adopts a strategy of retaining the best, a space compression strategy can be designed based on information entropy theory through the information of all sub-populations in the evolution process, which ensures the algorithmic stability and fast convergence to the global optimal solution. Furthermore, in order to explore the feasibility and effectiveness of the improved multi-group parallel algorithm, optimization tests are implemented on some of the typical multi-peak functions, and the results are compared with the analytic solution and optimal solution of basic GA. The outcome suggests that the global searching ability and convergence of the improved algorithm is far better than the basic one.
Consistent Vehicle Routing Problem Considering Traffic Congestion and Workload Balance

刘恒宇, 汝宜红
LIU Hengyu
, RU Yihong

- , 2016, DOI: 10.3969/j.issn.0258-2724.2016.05.016
Abstract: 为研究快递公司在提供一致性配送服务时,交通拥堵以及快递人员工作量平衡性因素对配送路径的影响,在传统车辆路径问题研究的基础上,提出了考虑拥堵和工作量的一致性车辆路径问题,并构建了混合整数规划模型。针对该模型的NP难性质,提出了基于模板路径的两阶段模拟退火算法(template-based simulated annealing heuristic,TSA)。该算法通过构建模板路径求解初始路径方案,再利用模拟退火算法优化路径方案,降低车辆总行驶时间。将该模型和算法应用于3组基准数据(benchmark data set)的数值实验,结果表明:本文模型和算法能有效解决此类问题,交通拥堵使最优配送路径的总行驶时间平均增加18.38%,使快递人员在任意两天到达同一顾客的最早与最晚时刻之差平均增加12.92%;当快递人员配件量的不平衡性平均下降35.82%后,二者仅分别平均增加2.29%和1.68%。
: In order to investigate the effects of transportation congestion and workload balance on the delivery routing of express delivery companies which wish to provide consistent services, a consistent vehicle routing problem considering traffic congestion and workload balance was proposed and a mixed integer programming model for this problem was constructed. In view of the model' s NP-hard property, a two-phase template-based simulated annealing method (TSA) was applied to solve this problem. The TSA attains an initial route plan by constructing template routes first, and then optimizes them using the simulated annealing method to decrease the total travel time. To verify the validity of the proposed model and algorithm, numerical experiments were conducted using three benchmark data sets. Results show that the model and TSA can solve this problem effectively. The traffic congestion will significantly increase the total travel time by an average of 18.38% and increase the difference between the earliest and latest arrival time at the same customer within any two days by an average of 12.92%. Besides, when the average difference of the delivery men's shipment quantity decreases by 35.82%, the total travel time and the difference between the earliest and latest arrival time at the same customer are only increased by 2.29% and 1.68%, respectively
Construction of Global Weak Entropy Solution of Initial-Boundary Value Problem for Scalar Conservation Laws with Weak Discontinuous Flux  [PDF]
Yihong Dai, Jing Zhang
American Journal of Computational Mathematics (AJCM) , 2017, DOI: 10.4236/ajcm.2017.74033
Abstract: This paper is concerned with the initial-boundary value problem of scalar conservation laws with weak discontinuous flux, whose initial data are a function with two pieces of constant and whose boundary data are a constant function. Under the condition that the flux function has a finite number of weak discontinuous points, by using the structure of weak entropy solution of the corresponding initial value problem and the boundary entropy condition developed by Bardos-Leroux-Nedelec, we give a construction method to the global weak entropy solution for this initial-boundary value problem, and by investigating the interaction of elementary waves and the boundary, we clarify the geometric structure and the behavior of boundary for the weak entropy solution.
Periodic and Almost Periodic Solutions of Functional Difference Equations with Finite Delay
Yihong Song
Advances in Difference Equations , 2007, DOI: 10.1155/2007/68023
Abstract: For periodic and almost periodic functional difference equations with finite delay, the existence of periodic and almost periodic solutions is obtained by using stability properties of a bounded solution.
Periodic and Almost Periodic Solutions of Functional Difference Equations with Finite Delay
Song Yihong
Advances in Difference Equations , 2007,
Abstract: For periodic and almost periodic functional difference equations with finite delay, the existence of periodic and almost periodic solutions is obtained by using stability properties of a bounded solution.
Comparative and Systematic Study on Staff Development in European and Chinese Universities
Fan Yihong
REDU : Revista de Docencia Universitaria , 2011,
Abstract: Este artículo es el resumen de un estudio comparativo y sistemático sobre la formación docente, entre universidades chinas y europeas, con el referente de fondo de los estudios sobre las universidades norteamericanas. El enfoque seguido para el análisis conceptual es doble; la perspectiva de Boyer acerca de la multiplicidad de funciones académicas es el primero. El segundo, es un modelo de cuatro dimensiones del desarrollo del profesorado propuesto por la Asociación Nacional Americana de Educación. El enfoque específico de investigación sobre estudios de caso presta atención a los siguientes aspectos: el marco conceptual, el contexto y la política, la estructura organizativa, la propuesta curricular y su desarrollo, el sistema de incentivos y recompensas para el trabajo académico y la evaluación y el efecto de los programas y las futuras tendencias de desarrollo del personal académico. El objetivo de este estudio es conocer las prácticas de desarrollo del personal en las universidades europeas con el fin de arrojar luz sobre la próxima fase de las políticas de desarrollo personal y los programas en China. ABSTRACT Comparative and Systematic Study on Staff Development in European and Chinese Universities. This paper summarizes a comparative and systematic study on staff development between Chinese and European universities with North American universities as background studies. The conceptual analytical lens is two-fold, one is Boyer’s multiple-scholarship perspective and the other is a four dimensional faculty development framework proposed by America National Education Association. The specific investigation framework of case studies pays attention to the following aspects: conceptual underpinning, context and policy, organizational structure, program and program delivery, incentive and reward scheme for staff development work, evaluation and effect of programs and future staff development trends. The objective of this study is to find out the staff development practices in European universities to shed light on the next phase of staff development policies and programs in China.
Summarizing Audiovisual Contents of a Video Program
Yihong Gong
EURASIP Journal on Advances in Signal Processing , 2003, DOI: 10.1155/s1687617203211082
Abstract: In this paper, we focus on video programs that are intended to disseminate information and knowledge such as news, documentaries, seminars, etc, and present an audiovisual summarization system that summarizes the audio and visual contents of the given video separately, and then integrating the two summaries with a partial alignment. The audio summary is created by selecting spoken sentences that best present the main content of the audio speech while the visual summary is created by eliminating duplicates/redundancies and preserving visually rich contents in the image stream. The alignment operation aims to synchronize each spoken sentence in the audio summary with its corresponding speaker ¢ € 2s face and to preserve the rich content in the visual summary. A Bipartite Graph-based audiovisual alignment algorithm is developed to efficiently find the best alignment solution that satisfies these alignment requirements. With the proposed system, we strive to produce a video summary that: (1) provides a natural visual and audio content overview, and (2) maximizes the coverage for both audio and visual contents of the original video without having to sacrifice either of them.
Thiazolidinediones on PPARγ: The Roles in Bone Remodeling
Wei Wei,Yihong Wan
PPAR Research , 2011, DOI: 10.1155/2011/867180
Abstract: Thiazolidinediones (TZDs) are synthetic PPARγ (peroxisome proliferator-activated receptor gamma) agonists and a class of drugs for diabetes mellitus type 2 that can decrease blood sugar efficiently by enhancing insulin sensitivity. However, increased bone fracture risk in diabetic individuals treated with TZDs is one of the reported side effects. Recent studies show that TZDs such as rosiglitazone simultaneously inhibit osteoblast differentiation and activate osteoclast differentiation, leading to bone loss due to decreased bone formation and increased bone resorption. Furthermore, TZDs may activate PPARγ in tissues other than bone, such as the hypothalamus-pituitary-gonad (HPG) axis to indirectly regulate bone mass. This paper will focus on current new developments that implicate potential mechanisms for how PPARγ modulates skeletal homeostasis and how TZDs exert bone-loss side effects. 1. Introduction Rather than a rigid and dormant organ that merely serves an inert support for the vertebrates, bone is a highly dynamic tissue that undergoes constant remodeling, adaptation, repair, and regeneration. Evolution has crafted the structure of the skeletal system in such an elegant way that it is light weighted so birds can fly, yet strong so cheetah can run and hunt. The quantity and quality of bone are influenced by both genetic traits and environmental factors such as nutrition, exercise, and hormone. Bone loss or osteoporosis occurs in physiological and pathological conditions such as aging, postmenopause, sedentary lifestyle, weightlessness during spaceflight, diabetes, and bone metastasis of cancers. With the extension of lifespan and changes in life style, osteoporosis and bone fractures are becoming a leading cause of morbidity and mortality in the modern society. It is estimated that an osteoporotic fracture occurs every 3 seconds worldwide [1]; one out of three women and one out of five men over 50 years of age will experience osteoporotic fractures [2–4]. Between 1990 and 2000, there was nearly a 25% increase in hip fractures worldwide [1]; by 2050, the worldwide incidence of hip fracture is projected to increase by 310% in men and 240% in women [5]. Osteoporosis takes a huge personal and economic toll, for example, in women over 45 years of age, it accounts for more days spent in hospital than many other diseases including diabetes, myocardial infarction, or breast cancer [6]. However, the great majority (>80%) of high-risk individuals are neither identified nor treated [7]. Therefore, enhanced understanding of bone biology and development of
Modeling and Analysis of Epidemic Diffusion within Small-World Network
Ming Liu,Yihong Xiao
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/841531
Abstract: To depict the rule of epidemic diffusion, two different models, the Susceptible-Exposure-Infected-Recovered-Susceptible (SEIRS) model and the Susceptible-Exposure-Infected-Quarantine-Recovered-Susceptible (SEIQRS) model, are proposed and analyzed within small-world network in this paper. Firstly, the epidemic diffusion models are constructed with mean-filed theory, and condition for the occurrence of disease diffusion is explored. Then, the existence and global stability of the disease-free equilibrium and the endemic equilibrium for these two complex epidemic systems are proved by differential equations knowledge and Routh-Hurwiz theory. At last, a numerical example which includes key parameters analysis and critical topic discussion is presented to test how well the proposed two models may be applied in practice. These works may provide some guidelines for decision makers when coping with epidemic diffusion controlling problems.
Theoretic study of the reaction mechanism between (Me)3CO radical and trans-3-hexene
GuoSheng Shi,YiHong Ding
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0474-3
Abstract: The reaction mechanism between (Me)3CO radical and trans-3-hexene in benzene was studied for the first time at the B3LYP/6–311++G(d,p)//B3LYP/6–31G(d)+ZPVE level. Two distinct elementary channels were identified as: (1) abstraction-addition; (2) addition-addition-elimination. Analysis of the potential energy surface demonstrates that for the title reaction, channels (1) and (2) have the major and minor contribution, respectively. Our calculated results can well explain the recently observed product distribution by Coseri et al. (J. Org. Chem. 2005, 70, 4629). However, we found that the addition-abstraction channel proposed by Coseri et al. is kinetically infeasible.
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