A new method for the solution of hybrid analog digital beamforming problems

By going to millimeter wave (mmWave) we can use large scale MIMO due to short mmWave wavelength to overcome path loss by using beamforming to focus power of signal to the receiver. System structure of mmWave band is different with conventional MIMO because of large scale MIMO which is leading to use many RF-chains. For this reason Hybrid structure have been proposed for large Scale MIMO. By going to Hybrid structure a new issue has been created with phase shifter constraint. In this paper we propose a novel solution to make a hybrid precoding and combing to reach high spectral efficiency. Our problem includes a maximizing Frobenius norm of multiplying five complex matrices. As constraints, all elements of some matrices must have unit norm, and also the multiplication of some matrices must have a specific Frobenius norm. A novel solution is proposed for the problem, which is gained in two steps. At the first step, we propose a new decomposition usable for kind of complex matrices which could lead to reduce the dimension of the objective function, and eliminating constraints completely and in the second step, we propose an iterated algorithm for the resulting problem. By proposing another novel technique, we show that in each iteration, the optimal problem is equivalent to a quadratic optimal problem with limitations on the vector norm, and as a result, an optimal problem is obtained quickly. Moreover, some other real examples are included to demonstrate the usefulness and effectiveness of the proposed algorithm.     

INSTRUCTIONS TO AUTHORS

<正>GENERAL INFORMATIONWorld Journal of Hepatology(World J Hepatol,WJH,online ISSN 1948-5182,DOI:10.4254)is a peer-reviewed open access(OA)academic journal that aims to guide clinical practice and improve diagnostic and therapeutic skills of clinicians.Aim and scopeWJH covers topics concerning arrhythmia,heart failure,vascular     

知识、态度、社会规范对青少年新型毒品使用的影响研究

目的研究知识、态度和社会规范与青少年新型毒品使用之间的关系并构建影响模式。方法采用分层随机整群抽样的方法进行抽样。来自武汉市初中、高中、职业高中和大学的共3018名学生参加了问卷调查，调查是无记名和自愿的。采用确证性因子分析构建测量模型，采用结构方法模型进行评价、修正以确定最佳模型。结果武汉市青少年新型毒品的滥用率为3．28％，其中男女生分别为4．81％和1．94％，普通初中、高中、职业高中和大学生的毒品滥用率分别为1．80％、2．91％、7．83％和3．25％。模型拟和效果较好。模型结果显示：知识、态度、社会规范影响青少年使用新型毒品，其中态度、社会规范直接影响青少年吸毒或吸毒倾向，而知识通过态度、社会规范的中介作用发挥效应。结论对新型毒品的了解不足、对待毒品的态度不正确以及吸毒社会规范不强增加青少年使用新型毒品的风险。     

《JCI医院评审标准》对医院财务管理的推动作用

学习和解读了《JCI医院评审标准》，希望通过借鉴国外先进的管理标准模式，推进财务管理现代化的进程，并且树立持续改进的观念。     

安眠颗粒结构优化的步骤与方法

目的:对治疗失眠中药小复方安眠颗粒的处方结构进行优化研究,为其临床前研究提供疗效可靠的优化处方,探索中药小复方定量优化方法。方法:运用均匀设计改良法,以特异的药效学指标为评价指标,进行处方最佳配伍和最佳剂量配比的研究。结果:以均匀设计法得出了安眠颗粒最佳配伍及最佳剂量配比的理论值,并经验证确认,剂量配比6组和理论1组药效最佳,因理论1组药味少,故推荐其用于新药开发研究。结论:该实验研究将拆方分析与最佳剂量配比研究结合起来,运用于处方优化具有切实可行性。     

建立高校教材质量学生评价指标体系的探索

全面评价教材除了有赖于专家学者的意见外,从教材使用者那里采集第一手的反馈信息也很有必要,本研究参考教育部的教材评价指标体系,结合参评人的实际情况,建立了适合高校学生的“高等学校文字教材质量学生评价指标体系”,通过对该指标体系的试评,认为该指标体系基本上反映了教材的全貌,具有较好的操作性。     

fMRI-constrained MEG source imaging and consideration of fMRI invisible sources

Recent studies on multimodal brain source imaging have shown that the use of functional MRI (fMRI) prior information could enhance spatial resolution of magnetoencephalography (MEG), while MEG could compensate poor temporal resolution of fMRI. This article deals with a multimodal imaging method, which combines fMRI and MEG for enhancing both spatial and temporal resolutions. Recent studies on the combination of fMRI and MEG have suggested that the fMRI prior information could be very easily implemented by just giving different weighting factors to the diagonal terms of source covariance matrix in linear inverse operator. We applied the fMRI constrained imaging method to several simulation data and experimental data (Japanese language lexical judgment experiment), and found that some MEG sources may be eliminated by the introduction of the fMRI weighting and the eliminated sources may affect source estimation in fMRI activation regions. In this article, in order to check whether the eliminated sources were fMRI invisible ones or just spurious ones, we placed small numbers of regional sources (rotating dipoles) around all possible activation regions and investigated their temporal changes. By investigating the results carefully, we could evaluate whether the missed sources were real or not.