针对通信频谱资源的匮乏以及去蜂窝MIMO在资源利用方面的优势,提出了一种毫米波(millimeter-wave,mmWave)场景下的去蜂窝MIMO通感一体化(intergraded sensing and communication,ISAC)系统。在该系统中,基站为用户提供服务的同时,多天...针对通信频谱资源的匮乏以及去蜂窝MIMO在资源利用方面的优势,提出了一种毫米波(millimeter-wave,mmWave)场景下的去蜂窝MIMO通感一体化(intergraded sensing and communication,ISAC)系统。在该系统中,基站为用户提供服务的同时,多天线用户设备能够主动检测多个目标。研究目标是设计模拟和数字波束形成器,以优化通信和雷达波束形成误差的加权和。研究中考虑了2种功率约束,并采用改进的正交匹配追踪算法和黎曼共轭梯度算法进行优化。对通信频谱效率和雷达波束方向图进行仿真分析,结果表明,混合波束方案能在频谱利用和波束指向方面实现折中的性能,这种方案对于提高系统性能具有潜在的应用前景。展开更多
A well-performed recommender system for an e-commerce web site can help customers easily find favorite items and then increase the turnover of merchants, hence it is important for both customers and merchants. In most...A well-performed recommender system for an e-commerce web site can help customers easily find favorite items and then increase the turnover of merchants, hence it is important for both customers and merchants. In most of the existing recommender systems, only the purchase information is utilized data and the navigational and behavioral data are seldom concerned. In this paper, we design a novel recommender system for comprehensive online shopping sites. In the proposed recommender system, the navigational and behavioral data, such as access, click, read, and purchase information of a customer, are utilized to calculate the preference degree to each item; then items with larger preference degrees are recommended to the customer. The proposed method has several innovations and two of them are more remarkable: one is that nonexpendable items are distinguished from expendable ones and handled by a different way; another is that the interest shifting of customers are considered. Lastly, we structure an example to show the operation procedure and the performance of the proposed recommender system. The results show that the proposed recommender method with considering interest shifting is superior to Kim et al(2011) method and the method without considering interest shifting.展开更多
Context-aware plays a pivotal role in the wisdom network of information processing. Due to the limited resources, context conflict is inevitable in context-aware. User satisfaction is a good reflection for the wisdom ...Context-aware plays a pivotal role in the wisdom network of information processing. Due to the limited resources, context conflict is inevitable in context-aware. User satisfaction is a good reflection for the wisdom degree of the network. In this paper, considering the user satisfaction, we propose a novel context-aware conflict solution model based on set pair Analysis （SPA）. The model obtains the best server mode by the maximum satisfaction connection degree to solve the conflict in context-aware. The simulation analysis shows that the proposed method is effective and can solve many users competition for the same scene of conflict.展开更多
Supplemental lighting can be applied in the greenhouse to obtain high-quality seedlings when the solar daily light integral(DLI)is insufficient.However,there is no optimal strategy for the supplementary light provided...Supplemental lighting can be applied in the greenhouse to obtain high-quality seedlings when the solar daily light integral(DLI)is insufficient.However,there is no optimal strategy for the supplementary light provided by white and blue light-emitting diodes(LEDs)with the same DLI in cucumber(Cucumis sativus L.)seedling production grown in the greenhouse in early spring.The objective of the study was to determine changes in morphology,photosynthesis,growth,and physiological characteristics in greenhouse-grown cucumber seedlings(cv.Tianjiao No.5)depending on different supplementary fractions(28.5%,33.5%,38.5%,43.5%,and 48.5%)of blue light(B)under constant DLI provided by combinations of white(B28.5%included)and blue LEDs,and cucumber seedlings were grown with sunlight only were set as the control.The results documented that supplementary light resulted in compact and robust greenhouse-grown cucumber seedlings with higher chlorophyll content and net photosynthetic rate compared to those grown without supplementary light.The plant height and hypocotyl length of cucumber seedlings decreased quadratically with an increase of blue light fractions provided by combinations of white and blue LEDs.Additionally,the leaf area and stem diameter of cucumber seedlings increased first and a decreased trend was observed subsequently with the increasing fraction of blue light in a quadratic function.Similar trends were found in root architecture(e.g.,root length,root surface area,and root volume)and root activity of cucumber seedlings;however,no significant differences were exhibited as blue light fraction increased from 38.5%to 43.5%provided by supplementary light.Stem firmness and cellulose content increased by 26.2%and 23.4%,respectively,as 15%blue light was added to white LEDs.In conclusion,the 43.5%blue light created by supplementary broad-spectrum white and blue LEDs resulted in compact and stoutest cucumber seedlings along with well-developed root system and higher stem firmness,thus improving the mechanical strength of the greenhouse-grown cucumber seedlings for transplanting.展开更多
文摘针对通信频谱资源的匮乏以及去蜂窝MIMO在资源利用方面的优势,提出了一种毫米波(millimeter-wave,mmWave)场景下的去蜂窝MIMO通感一体化(intergraded sensing and communication,ISAC)系统。在该系统中,基站为用户提供服务的同时,多天线用户设备能够主动检测多个目标。研究目标是设计模拟和数字波束形成器,以优化通信和雷达波束形成误差的加权和。研究中考虑了2种功率约束,并采用改进的正交匹配追踪算法和黎曼共轭梯度算法进行优化。对通信频谱效率和雷达波束方向图进行仿真分析,结果表明,混合波束方案能在频谱利用和波束指向方面实现折中的性能,这种方案对于提高系统性能具有潜在的应用前景。
基金supported by theNational High-Tech R&D Program (863 Program) No. 2015AA01A705the National Natural Science Foundation of China under Grant No. 61572072+2 种基金the National Science and Technology Major Project No. 2015ZX03001041Fundamental Research Funds for the Central Universities No. FRF-TP-15-027A3Yunnan Provincial Department of Education Foundation Project (No. 2014Y087)
文摘A well-performed recommender system for an e-commerce web site can help customers easily find favorite items and then increase the turnover of merchants, hence it is important for both customers and merchants. In most of the existing recommender systems, only the purchase information is utilized data and the navigational and behavioral data are seldom concerned. In this paper, we design a novel recommender system for comprehensive online shopping sites. In the proposed recommender system, the navigational and behavioral data, such as access, click, read, and purchase information of a customer, are utilized to calculate the preference degree to each item; then items with larger preference degrees are recommended to the customer. The proposed method has several innovations and two of them are more remarkable: one is that nonexpendable items are distinguished from expendable ones and handled by a different way; another is that the interest shifting of customers are considered. Lastly, we structure an example to show the operation procedure and the performance of the proposed recommender system. The results show that the proposed recommender method with considering interest shifting is superior to Kim et al(2011) method and the method without considering interest shifting.
文摘Context-aware plays a pivotal role in the wisdom network of information processing. Due to the limited resources, context conflict is inevitable in context-aware. User satisfaction is a good reflection for the wisdom degree of the network. In this paper, considering the user satisfaction, we propose a novel context-aware conflict solution model based on set pair Analysis （SPA）. The model obtains the best server mode by the maximum satisfaction connection degree to solve the conflict in context-aware. The simulation analysis shows that the proposed method is effective and can solve many users competition for the same scene of conflict.
基金supported by the National Key Research and Development Program of China(2019YFD1001901)the Modern Agricultural Industrial Technology System of Shandong Province(SDAITG05G06)+1 种基金the Natural Science Foundation of Shandong Province(ZR2021QC174)the Experimental Technology Research Program of Qingdao Agricultural University(SYJS202117).
文摘Supplemental lighting can be applied in the greenhouse to obtain high-quality seedlings when the solar daily light integral(DLI)is insufficient.However,there is no optimal strategy for the supplementary light provided by white and blue light-emitting diodes(LEDs)with the same DLI in cucumber(Cucumis sativus L.)seedling production grown in the greenhouse in early spring.The objective of the study was to determine changes in morphology,photosynthesis,growth,and physiological characteristics in greenhouse-grown cucumber seedlings(cv.Tianjiao No.5)depending on different supplementary fractions(28.5%,33.5%,38.5%,43.5%,and 48.5%)of blue light(B)under constant DLI provided by combinations of white(B28.5%included)and blue LEDs,and cucumber seedlings were grown with sunlight only were set as the control.The results documented that supplementary light resulted in compact and robust greenhouse-grown cucumber seedlings with higher chlorophyll content and net photosynthetic rate compared to those grown without supplementary light.The plant height and hypocotyl length of cucumber seedlings decreased quadratically with an increase of blue light fractions provided by combinations of white and blue LEDs.Additionally,the leaf area and stem diameter of cucumber seedlings increased first and a decreased trend was observed subsequently with the increasing fraction of blue light in a quadratic function.Similar trends were found in root architecture(e.g.,root length,root surface area,and root volume)and root activity of cucumber seedlings;however,no significant differences were exhibited as blue light fraction increased from 38.5%to 43.5%provided by supplementary light.Stem firmness and cellulose content increased by 26.2%and 23.4%,respectively,as 15%blue light was added to white LEDs.In conclusion,the 43.5%blue light created by supplementary broad-spectrum white and blue LEDs resulted in compact and stoutest cucumber seedlings along with well-developed root system and higher stem firmness,thus improving the mechanical strength of the greenhouse-grown cucumber seedlings for transplanting.
