Cache-enabled small cell networks have been regarded as a promising approach for network operators to cope with the explosive data traffic growth in future 5 G networks. However, the user association and resource allo...Cache-enabled small cell networks have been regarded as a promising approach for network operators to cope with the explosive data traffic growth in future 5 G networks. However, the user association and resource allocation mechanism has not been thoroughly studied under given content placement situation. In this paper, we formulate the joint optimization problem of user association and resource allocation as a mixed integer nonlinear programming(MINLP) problem aiming at deriving a balance between the total utility of data rates and the total data rates retrieved from caches. To solve this problem, we propose a distributed relaxing-rounding method. Simulation results demonstrate that the distributed relaxing-rounding method outperforms traditional max-SINR method and range-expansion method in terms of both total utility of data rates and total data rates retrieved from caches in practical scenarios. In addition, effects of storage and backhaul capacities on the performance are also studied.展开更多
Spatial transcriptomics technology has been an essential and powerful method for delineating tissue architecture at the molecular level.However,due to the limitations of the current spatial techniques,the cellular inf...Spatial transcriptomics technology has been an essential and powerful method for delineating tissue architecture at the molecular level.However,due to the limitations of the current spatial techniques,the cellular information cannot be directly measured but instead spatial spots typically varying from a diameter of 0.2 to 100µm are characterized.Therefore,it is vital to apply computational strategies for inferring the cellular composition within each spatial spot.The main objective of this review is to summarize the most recent progresses in estimating the exact cellular proportions for each spatial spot,and to prospect the future directions of this field.展开更多
Suitable electron transport layers are essential for high performance planar perovskite heterojunction solar cells. Here, we use ZnO electron transport layer sputtered under oxygen-rich atmosphere at room temperature ...Suitable electron transport layers are essential for high performance planar perovskite heterojunction solar cells. Here, we use ZnO electron transport layer sputtered under oxygen-rich atmosphere at room temperature to decrease the hydroxide and then suppress decomposition of perovskite films. The perovskite films with improved crystallinity and morphology are achieved. Besides, on the ZnO substrate fabricated at oxygen-rich atmosphere, open-circuit voltage of the CH_3NH_3PbI_3-based perovskite solar cells increased by 0.13 V.A high open-circuit voltage of 1.16 V provides a good prospect for the perovskite-based tandem solar cells. The ZnO sputtered at room temperature can be easily fabricated industrially on a large scale, therefore, compatible to flexible and tandem devices. Those properties make the sputtered ZnO films promising as electron transport materials for perovskite solar cells.展开更多
基金supported by National Natural Science Foundation of China under Grants No. 61371087 and 61531013The Research Fund of Ministry of Education-China Mobile (MCM20150102)
文摘Cache-enabled small cell networks have been regarded as a promising approach for network operators to cope with the explosive data traffic growth in future 5 G networks. However, the user association and resource allocation mechanism has not been thoroughly studied under given content placement situation. In this paper, we formulate the joint optimization problem of user association and resource allocation as a mixed integer nonlinear programming(MINLP) problem aiming at deriving a balance between the total utility of data rates and the total data rates retrieved from caches. To solve this problem, we propose a distributed relaxing-rounding method. Simulation results demonstrate that the distributed relaxing-rounding method outperforms traditional max-SINR method and range-expansion method in terms of both total utility of data rates and total data rates retrieved from caches in practical scenarios. In addition, effects of storage and backhaul capacities on the performance are also studied.
基金supported by Changping Laboratory,China.Thank Xiangxing Jin for helping prepare the illustrations in this work.
文摘Spatial transcriptomics technology has been an essential and powerful method for delineating tissue architecture at the molecular level.However,due to the limitations of the current spatial techniques,the cellular information cannot be directly measured but instead spatial spots typically varying from a diameter of 0.2 to 100µm are characterized.Therefore,it is vital to apply computational strategies for inferring the cellular composition within each spatial spot.The main objective of this review is to summarize the most recent progresses in estimating the exact cellular proportions for each spatial spot,and to prospect the future directions of this field.
基金supported by the International Cooperation Projects of the Ministry of Science and Technology (2014DFE60170)the National Natural Science Foundation of China (61474065 and 61674084)+2 种基金Tianjin Research Key Program of Application Foundation and Advanced Technology (15JCZDJC31300)the Key Project in the Science & Technology Pillar Program of Jiangsu Province (BE2014147-3)the 111 Project (B16027)
文摘Suitable electron transport layers are essential for high performance planar perovskite heterojunction solar cells. Here, we use ZnO electron transport layer sputtered under oxygen-rich atmosphere at room temperature to decrease the hydroxide and then suppress decomposition of perovskite films. The perovskite films with improved crystallinity and morphology are achieved. Besides, on the ZnO substrate fabricated at oxygen-rich atmosphere, open-circuit voltage of the CH_3NH_3PbI_3-based perovskite solar cells increased by 0.13 V.A high open-circuit voltage of 1.16 V provides a good prospect for the perovskite-based tandem solar cells. The ZnO sputtered at room temperature can be easily fabricated industrially on a large scale, therefore, compatible to flexible and tandem devices. Those properties make the sputtered ZnO films promising as electron transport materials for perovskite solar cells.
