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作者： zuhura juma ally 浙江师范大学

学位级别：硕士

This study examines parental involvement in children school learning in community secondary schools and particularly addresses the questions on the influence of effective parent’s involvement in children’s school learning in community secondary schools in Temeke *** study adopts Epstein’s school-family/community partnerships model that focuses on stakeholder relationships and the influence on children school *** theory assumes that since parents know their children’s educational aspirations and how to drive them to success,schools can decide to make choices that are either positive or negative to children school learning,by either drawing them together or *** study employs qualitative research design,in which data were obtained through in-depth interviews and documentary *** generate the information for the study,54 randomly selected participants were involved in the study and the descriptive statistics was used to assess the influence of parental involvement in children school learning within the study *** findings from the study revealed that 38.3 percent of the respondents reported that,there is high involvement of parents in children school learning while 61.07% reported that the involvement of parents in school learning is small due to economic and social *** study recommends that,since the intellectual development of children depends on the collaboration between community/parents and teachers,special interventions by the government and CSOs are needed to address specific challenges posed by relationship between parents and children in promoting children school learning.

关键词：父母参与学龄儿童学校学习

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Evaluation of Linear Precoding Schemes for Cooperative Multi-Cell MU MIMO in Future Mobile Communication Systems

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Journal of Computer and Communications 2023年第6期11卷 28-42页

作者： juma Said ally Department of Electronics and Telecommunication Engineering College of Information and Communication Technology Mbeya University of Science and Technology Mbeya Tanzania

In Mobile Communication Systems, inter-cell interference becomes one of the challenges that degrade the system’s performance, especially in the region with massive mobile users. The linear precoding schemes were proposed to mitigate interferences between the base stations (inter-cell). These schemes are categorized into linear and non-linear;this study focused on linear precoding schemes, which are grounded into three types, namely Zero Forcing (ZF), Block Diagonalization (BD), and Signal Leakage Noise Ratio (SLNR). The study included the Cooperative Multi-cell Multi Input Multi Output (MIMO) System, whereby each Base Station serves more than one mobile station and all Base Stations on the system are assisted by each other by shared the Channel State Information (CSI). Based on the Multi-Cell Multiuser MIMO system, each Base Station on the cell is intended to maximize the data transmission rate by its mobile users by increasing the Signal Interference to Noise Ratio after the interference has been mitigated due to the usefully of linear precoding schemes on the transmitter. Moreover, these schemes used different approaches to mitigate interference. This study mainly concentrates on evaluating the performance of these schemes through the channel distribution models such as Ray-leigh and Rician included in the presence of noise errors. The results show that the SLNR scheme outperforms ZF and BD schemes overall scenario. This implied that when the value of SNR increased the performance of SLNR increased by 21.4% and 45.7% for ZF and BD respectively.

关键词： Precoding Schemes Cooperative Networks Interference Multi-Input Multi-Output (MIMO) Multi-Cell and Multiuser

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Tanzania Heart of Attraction

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地学前缘 2009年第S1期16卷 3-3页

作者： zuhura Mustafa ally University of Dar es salaam

Ground waters in the Ngorongoro Crater,Tanzania, home to thousands of large mammals and a World Heritage Site,is controlled by the volcanic host rock lithology,evaporative concentration,mineral precipitation and re-dissolution,and biological *** are evaporative concentration and biological activity in swamps commonly produce strong

关键词： Tanzania Ngorongoro Crater ground water

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Energy-Efficient MTC Data Offloading in Wireless Networks Based on K-Means Grouping Technique

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Journal of Computer and Communications 2019年第2期7卷 47-61页

作者： juma Saidi ally Muhammad Asif Qingli Ma Department of Information and Communication Engineering University of Science and Technology of China<br/> Key Laboratory of Wireless-Optical Communications Chinese Academy of Sciences Hefei China

Machine-type communication (MTC) devices provide a broad range of data collection especially on the massive data generated environments such as urban, industrials and event-enabled areas. In dense deployments, the data collected at the closest locations between the MTC devices are spatially correlated. In this paper, we propose a k-means grouping technique to combine all MTC devices based on spatially correlated. The MTC devices collect the data on the event-based area and then transmit to the centralized aggregator for processing and computing. With the limitation of computational resources at the centralized aggregator, some grouped MTC devices data offloaded to the nearby base station collocated with the mobile edge-computing server. As a sensing capability adopted on MTC devices, we use a power exponential function model to compute a correlation coefficient existing between the MTC devices. Based on this framework, we compare the energy consumption when all data processed locally at centralized aggregator or offloaded at mobile edge computing server with optimal solution obtained by the brute force method. Then, the simulation results revealed that the proposed k-means grouping technique reduce the energy consumption at centralized aggregator while satisfying the required completion time.

关键词： Machine-Type Communication Correlation Data Offloading Grouping Technique Differential Entropy Power Exponential Function

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协作多小区多用户MIMO系统中线性预编码方案的性能分析

协作多小区多用户MIMO系统中线性预编码方案的性能分析

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作者：朱马（juma Saidi ally）华中科技大学

学位级别：硕士

在无线通信系统中，预编码方案作为消除小区间干扰的方案之一，特别对小区边缘用户有效。这些预编码方案可以分为线性和非线性两类。鉴于非线性与编码方案的复杂性，本文主要研究信漏噪比（SLNR），迫零（ZF）以及块对角化（BD）这三种... 详细信息

在无线通信系统中，预编码方案作为消除小区间干扰的方案之一，特别对小区边缘用户有效。这些预编码方案可以分为线性和非线性两类。鉴于非线性与编码方案的复杂性，本文主要研究信漏噪比（SLNR），迫零（ZF）以及块对角化（BD）这三种线性预编码方案。本论文基于多小区协作MIMO系统，每个基站服务于多个用户，基站相互协作并共享信道状态信息，使得所有发射机都已知信道信息。在多小区多用户MIMO系统中，每个基站会利用合适的预编码方案来提高信干噪比，从而最大化数据传输速率。当然，不同的预编码方案会使用不同的方法来完成消除干扰的任务。本文的主要工作集中于对在瑞利和莱斯信道分布模型下不同线性预编码方案进行评估以及考虑在不完全信道信息下的性能表现。在协作系统中，边缘用户会选择更强的信号作为有效信号。一般情况下，通过考虑对每个用户接收端的信号处理过程进行一定的数学推导以及利用MATLAB环境搭建仿真平台对不同的预编码方案进行仿真比较。将每个小区能达到吞吐量作为衡量准则，实验结果表明，信漏噪比方案（SLNR）比起迫零算法（ZF）与块对角算法（BD）具有更好的性能。

关键词：预编码协作干扰多小区和多用户

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