提高托育服务质量是托育服务实践发展中的重要课题。托育服务质量观对托育服务实践有着深刻影响。从国际视野下利益相关者的视角探讨托育服务质量观,对推动我国托育服务质量观的研究和托育服务体系建设具有重要意义。研究采用系统性文...提高托育服务质量是托育服务实践发展中的重要课题。托育服务质量观对托育服务实践有着深刻影响。从国际视野下利益相关者的视角探讨托育服务质量观,对推动我国托育服务质量观的研究和托育服务体系建设具有重要意义。研究采用系统性文献综述法,选取Web of Science、ERIC、MEDLINE和Academic Search Ultimate数据库中近十年的17篇相关实证研究论文进行统计分析。研究发现,国际视野下利益相关者的托育服务质量观比较一致的主要包括对环境条件、日常保育、早期学习支持、合作共育四大方面的认识,但不同利益相关者的托育服务质量观也存在一定差异。基于此,研究探讨了对我国托育服务质量观的启示。展开更多
Based on the cross-layer design, the power-optimization problem of Macro-Femto Heterogeneous Networks （HetNets） has been formulated. The constraints of power and re-source block allocation in the physical layer, del...Based on the cross-layer design, the power-optimization problem of Macro-Femto Heterogeneous Networks （HetNets） has been formulated. The constraints of power and re-source block allocation in the physical layer, delay and target data rate in the medium ac-cess control layer, urgent queue length in the network layer, and packet error rate in the transport layer, have been considered. The original problem is non-deterministic polyno-mial time hard, which cannot be solved practi-cally. After the restrictions of upper layers are translated into constraints with physical layer parameters, and the integer restrictions are relaxed, the original problem can be decom- posed into convex optimization subproblems. The optimal solutions of resource block allo-cation and power allocation can be obtained by using the Lagrangian optimization. Simula-tion results show that the proposed scheme is better than both the round robin algorithm and the max-rain one in terms of energy efficiency, throughput and service fairness. The round robin algorithm and the max-min one only focus on the user fairness rather than quality of service fairness. Compared to the round robin scheme （the max-min one）, the proposed scheme improves the energy efficiency 58.85% （62.41%）, the throughput 19.09% （25.25%）, the service fairness 57.69% （35.48%）.展开更多
文摘提高托育服务质量是托育服务实践发展中的重要课题。托育服务质量观对托育服务实践有着深刻影响。从国际视野下利益相关者的视角探讨托育服务质量观,对推动我国托育服务质量观的研究和托育服务体系建设具有重要意义。研究采用系统性文献综述法,选取Web of Science、ERIC、MEDLINE和Academic Search Ultimate数据库中近十年的17篇相关实证研究论文进行统计分析。研究发现,国际视野下利益相关者的托育服务质量观比较一致的主要包括对环境条件、日常保育、早期学习支持、合作共育四大方面的认识,但不同利益相关者的托育服务质量观也存在一定差异。基于此,研究探讨了对我国托育服务质量观的启示。
基金supported in part by the project of National Natural Science Foundation of China under Grant No. 61071075National Science and Technology Major Project of China under Grant No. 2010ZX03003-001-02+1 种基金National Science and Technology Major Project of China under Grant No. 2011ZX03004003the Chinese Ministry of Education in the project of the Fundamental Research Funds for the Central Universities under Grant No.2011YJS216
文摘Based on the cross-layer design, the power-optimization problem of Macro-Femto Heterogeneous Networks （HetNets） has been formulated. The constraints of power and re-source block allocation in the physical layer, delay and target data rate in the medium ac-cess control layer, urgent queue length in the network layer, and packet error rate in the transport layer, have been considered. The original problem is non-deterministic polyno-mial time hard, which cannot be solved practi-cally. After the restrictions of upper layers are translated into constraints with physical layer parameters, and the integer restrictions are relaxed, the original problem can be decom- posed into convex optimization subproblems. The optimal solutions of resource block allo-cation and power allocation can be obtained by using the Lagrangian optimization. Simula-tion results show that the proposed scheme is better than both the round robin algorithm and the max-rain one in terms of energy efficiency, throughput and service fairness. The round robin algorithm and the max-min one only focus on the user fairness rather than quality of service fairness. Compared to the round robin scheme （the max-min one）, the proposed scheme improves the energy efficiency 58.85% （62.41%）, the throughput 19.09% （25.25%）, the service fairness 57.69% （35.48%）.
