Virtual data center is a new form of cloud computing concept applied to data center. As one of the most important challenges, virtual data center embedding problem has attracted much attention from researchers. In dat...Virtual data center is a new form of cloud computing concept applied to data center. As one of the most important challenges, virtual data center embedding problem has attracted much attention from researchers. In data centers, energy issue is very important for the reality that data center energy consumption has increased by dozens of times in the last decade. In this paper, we are concerned about the cost-aware multi-domain virtual data center embedding problem. In order to solve this problem, this paper first addresses the energy consumption model. The model includes the energy consumption model of the virtual machine node and the virtual switch node, to quantify the energy consumption in the virtual data center embedding process. Based on the energy consumption model above, this paper presents a heuristic algorithm for cost-aware multi-domain virtual data center embedding. The algorithm consists of two steps: inter-domain embedding and intra-domain embedding. Inter-domain virtual data center embedding refers to dividing virtual data center requests into several slices to select the appropriate single data center. Intra-domain virtual data center refers to embedding virtual data center requests in each data center. We first propose an inter-domain virtual data center embedding algorithm based on label propagation to select the appropriate single data center. We then propose a cost-aware virtual data center embedding algorithm to perform the intra-domain data center embedding. Extensive simulation results show that our proposed algorithm in this paper can effectively reduce the energy consumption while ensuring the success ratio of embedding.展开更多
This research investigates the impact of managed health care on academic medical centers in the United States. Academic medical centers hold a unique position in the U. S. health care system through their missions of ...This research investigates the impact of managed health care on academic medical centers in the United States. Academic medical centers hold a unique position in the U. S. health care system through their missions of conducting cutting-edge biomedical researeh, pursuing clinical and technological innovations, Providing state-of-the-art medical care and producing highly qUalified health professionals. However, policies to control costs through the use of managed care and limiting resources are detrimental to academic medical centers and impede the advancement of medical sciTo survive the threats of managed care in the health care environment, acadendc medical centers must rely on their upper level managers to derive successful strategies. The methods used in this study include qualitative approaches in the form of key informants and case studies. In addition, a survey questionnaire was sent to 1h8 CEOs in all the academic medical centers in the U. S. The findings revealed that managers who perform the liaison, monitor, entrepreneur and resource allocator roles are crucial to ensure the survival of academic medical centers, so that academic medical centers can continue their missions to serve the general public and promote their well-being.展开更多
Introduction: Malaria is both a disease caused by poverty and a cause of poverty. Malaria is the leading cause of morbidity and mortality in Mali and is among the ten countries with the highest number of malaria cases...Introduction: Malaria is both a disease caused by poverty and a cause of poverty. Malaria is the leading cause of morbidity and mortality in Mali and is among the ten countries with the highest number of malaria cases and deaths. The objective was to estimate the direct economic cost borne by families in the treatment of severe malaria in children aged 0 - 5 years at the CSREF in Fana. Methodology: The study was cross-sectional, conducted from July 2017 to June 2018 with inclusion criteria and prospective data collection. The methodology was based on estimating the direct economic cost of severe malaria. Results: The sample consisted of 109 cases out of a total of 944 hospitalizations;59% of whom were boys and the 25 - 36 month age group was the most affected. The complications frequently encountered were severe anemia (50 cases) or 45.8%;convulsions (35 cases) or 32.1% and finally severe sepsis (8 cases) or 7.3%. The average direct cost was 25,324 Franc CFA (58.95 US Dollars) of which 66% represented the costs of medicines and consumables against 4% for the consultation. This cost was more than half the minimum wage in Mali. Conclusion: Despite the difficulties in estimating the cost in hospitals, the results obtained give us an estimate of the economic burden borne by families in the management of severe malaria cases among children in the district of Fana. Support is needed for parents in the fight against malaria in rural Mali.展开更多
基金supported in part by the following funding agencies of China:National Natural Science Foundation under Grant 61602050 and U1534201National Key Research and Development Program of China under Grant 2016QY01W0200
文摘Virtual data center is a new form of cloud computing concept applied to data center. As one of the most important challenges, virtual data center embedding problem has attracted much attention from researchers. In data centers, energy issue is very important for the reality that data center energy consumption has increased by dozens of times in the last decade. In this paper, we are concerned about the cost-aware multi-domain virtual data center embedding problem. In order to solve this problem, this paper first addresses the energy consumption model. The model includes the energy consumption model of the virtual machine node and the virtual switch node, to quantify the energy consumption in the virtual data center embedding process. Based on the energy consumption model above, this paper presents a heuristic algorithm for cost-aware multi-domain virtual data center embedding. The algorithm consists of two steps: inter-domain embedding and intra-domain embedding. Inter-domain virtual data center embedding refers to dividing virtual data center requests into several slices to select the appropriate single data center. Intra-domain virtual data center refers to embedding virtual data center requests in each data center. We first propose an inter-domain virtual data center embedding algorithm based on label propagation to select the appropriate single data center. We then propose a cost-aware virtual data center embedding algorithm to perform the intra-domain data center embedding. Extensive simulation results show that our proposed algorithm in this paper can effectively reduce the energy consumption while ensuring the success ratio of embedding.
文摘This research investigates the impact of managed health care on academic medical centers in the United States. Academic medical centers hold a unique position in the U. S. health care system through their missions of conducting cutting-edge biomedical researeh, pursuing clinical and technological innovations, Providing state-of-the-art medical care and producing highly qUalified health professionals. However, policies to control costs through the use of managed care and limiting resources are detrimental to academic medical centers and impede the advancement of medical sciTo survive the threats of managed care in the health care environment, acadendc medical centers must rely on their upper level managers to derive successful strategies. The methods used in this study include qualitative approaches in the form of key informants and case studies. In addition, a survey questionnaire was sent to 1h8 CEOs in all the academic medical centers in the U. S. The findings revealed that managers who perform the liaison, monitor, entrepreneur and resource allocator roles are crucial to ensure the survival of academic medical centers, so that academic medical centers can continue their missions to serve the general public and promote their well-being.
文摘Introduction: Malaria is both a disease caused by poverty and a cause of poverty. Malaria is the leading cause of morbidity and mortality in Mali and is among the ten countries with the highest number of malaria cases and deaths. The objective was to estimate the direct economic cost borne by families in the treatment of severe malaria in children aged 0 - 5 years at the CSREF in Fana. Methodology: The study was cross-sectional, conducted from July 2017 to June 2018 with inclusion criteria and prospective data collection. The methodology was based on estimating the direct economic cost of severe malaria. Results: The sample consisted of 109 cases out of a total of 944 hospitalizations;59% of whom were boys and the 25 - 36 month age group was the most affected. The complications frequently encountered were severe anemia (50 cases) or 45.8%;convulsions (35 cases) or 32.1% and finally severe sepsis (8 cases) or 7.3%. The average direct cost was 25,324 Franc CFA (58.95 US Dollars) of which 66% represented the costs of medicines and consumables against 4% for the consultation. This cost was more than half the minimum wage in Mali. Conclusion: Despite the difficulties in estimating the cost in hospitals, the results obtained give us an estimate of the economic burden borne by families in the management of severe malaria cases among children in the district of Fana. Support is needed for parents in the fight against malaria in rural Mali.
