SAIEE Africa Research Journal最新文献_第10页

On the attenuation of ultrasound by pure black tattoo ink 纯黑纹身油墨对超声波的衰减

IF 1.4

SAIEE Africa Research Journal Pub Date : 2021-01-29 DOI: 10.23919/SAIEE.2021.9340534

Craig S. Carlson;Aurélie Deroubaix;Clement Penny;Michiel Postema

引用次数: 2

Performance study of path loss models at 14, 18, and 22 GHz in an indoor corridor environment for wireless communications 无线通信室内走廊环境中14、18和22GHz路径损耗模型的性能研究

IF 1.4

SAIEE Africa Research Journal Pub Date : 2021-01-29 DOI: 10.23919/SAIEE.2021.9340535

Mohamed K. Elmezughi;Thomas J. Afullo;Nicholas O. Oyie

{"title":"Performance study of path loss models at 14, 18, and 22 GHz in an indoor corridor environment for wireless communications","authors":"Mohamed K. Elmezughi;Thomas J. Afullo;Nicholas O. Oyie","doi":"10.23919/SAIEE.2021.9340535","DOIUrl":"https://doi.org/10.23919/SAIEE.2021.9340535","url":null,"abstract":"The critical rule to achieve extremely high peaks of data transmission is the availability of a tremendous amount of bandwidth. The super high frequency (SHF) and the millimeter-wave (mmWave) frequency bands are the candidates for the deployment of the 5G cellular system and for satisfying future needs due to their massively available blocks of contiguous raw bandwidth that is capable of supporting additional data traffic for multimedia services. This research paper presents propagation measurements at three frequencies above 6 GHz, which are 14, 18, and 22 GHz frequency bands. The measurements were carried out or both line-of-sight (LOS) and non-line-of-sight (NLOS) communication scenarios in an indoor corridor environment to present frequency- and distance-dependent wireless channel models. Moreover, this study presents, investigates, and compares the performance of two well-known path loss prediction models; the single frequency close-in (CI) free space reference distance model and the single frequency floating intercept (FI) model. The LOS comparison study shows that the CI and FI models provide comparable and accurate estimates that fit the real measured data for the frequency bands selected. Furthermore, the study investigates the behavior of the path loss exponent (PLE) and the FI model parameters as a function of the reception angle of arrival (AoA) in the NLOS scenario. It is observed from this work that the path loss models' parameters exhibit symmetrical behavior around 180° AoA. The FI model provides the same standard deviation values as the CI model in the LOS scenario. In contrast, the FI model offers a notable reduction(up to 2.84 dB) compared to the CI model in the NLOS scenario. Finally, the LOS and NLOS results reveal that the CI and FI models can be trusted as good path loss models for corridor environments and exhibit stable behavior over measured distances and frequencies.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.23919/SAIEE.2021.9340535","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67992285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Design and implementation of a Luganda text normalization module for a speech synthesis software program 语音合成软件程序中Luganda文本规范化模块的设计与实现

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-09-10 DOI: 10.23919/SAIEE.2020.9194384

Ronald Kizito;Wayne S. Okello;Sulaiman Kagumire

引用次数: 2

A novel low line regulation CMOS voltage reference without BJTs and resistors 一种新型无BJT和电阻器的低线调节CMOS电压基准

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-09-10 DOI: 10.23919/SAIEE.2020.9194381

Changqing Zhang;Xia Wu;Wanling Deng;Junkai Huang

引用次数: 1

Editors and reviewers 编辑和评审

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-09-10 DOI: 10.23919/SAIEE.2020.9194379

引用次数: 0

Guest editorial note 嘉宾社论

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-09-10 DOI: 10.23919/SAIEE.2020.9194382

D. K. Okello;E. Mugume;M. Busogi

引用次数: 0

Leveraging the Technology of Unmanned Aerial Vehicles for Developing Countries 为发展中国家利用无人机技术

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-09-10 DOI: 10.23919/SAIEE.2020.9194383

Sheila N. Mugala;Dorothy K. Okello;Jonathan Serugunda

{"title":"Leveraging the Technology of Unmanned Aerial Vehicles for Developing Countries","authors":"Sheila N. Mugala;Dorothy K. Okello;Jonathan Serugunda","doi":"10.23919/SAIEE.2020.9194383","DOIUrl":"https://doi.org/10.23919/SAIEE.2020.9194383","url":null,"abstract":"The technology of unmanned aerial vehicles (UAVs) renders itself easily to a variety of applications because of their characteristics such as flexibility, quick deployment and cost effectiveness. Developing countries can harness UAV technology for humanitarian and development goals. This paper presents five interesting UAV applications for developing countries and these include disaster management, agriculture, delivery, surveillance of transmission lines and network coverage. UAVs aid the process of disaster management because they can be quickly deployed to take imagery which is used by rescue teams. They offer a cheap alternative to satellites and manned aircraft for agricultural mapping and management. Developing countries are faced with the major challenge of inadequate infrastructure which can be overcome by using UAVs to make especially emergency deliveries. UAVs are more effective at inspecting power transmission lines than manual techniques especially in developing countries where it is expected that the power transmission lines will span over tens of thousands of kilometres. Network coverage can be achieved cost effectively using UAVs for rural remote areas that are neglected by network operators because of their low economic return. This paper also discusses challenges that must be overcome to fully exploit UAV technology for the mentioned applications. Additionally, this paper presents interventions by African governments towards the development of UAV technology.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.23919/SAIEE.2020.9194383","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67891249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Notes for authors 作者须知

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-09-10 DOI: 10.23919/SAIEE.2020.9194385

引用次数: 0

Editors and Reviewers 编辑和评审

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-07-16 DOI: 10.23919/SAIEE.2020.9142599

引用次数: 0

Automatic pupil detection and gaze estimation using the vestibulo-ocular reflex in a low-cost eye-tracking setup 在低成本的眼睛跟踪装置中使用前庭-眼睛反射的自动瞳孔检测和凝视估计

IF 1.4

SAIEE Africa Research Journal Pub Date : 2020-07-16 DOI: 10.23919/SAIEE.2020.9142605

Vered Aharonson;Verushen Y. Coopoo;Kyle L. Govender;Michiel Postema

{"title":"Automatic pupil detection and gaze estimation using the vestibulo-ocular reflex in a low-cost eye-tracking setup","authors":"Vered Aharonson;Verushen Y. Coopoo;Kyle L. Govender;Michiel Postema","doi":"10.23919/SAIEE.2020.9142605","DOIUrl":"https://doi.org/10.23919/SAIEE.2020.9142605","url":null,"abstract":"Automatic eye tracking is of interest for interaction with people suffering from amyotrophic lateral sclerosis, for using the eyes to control a computer mouse, and for controlled radiotherapy of uveal melanoma. It has been speculated that gaze estimation accuracy might be improved by using the vestibulo-ocular reflex. This involuntary reflex results in slow, compensatory eye movements, opposing the direction of head motion. We therefore hypothesised that leaving the head to move freely during eye tracking must produce more accurate results than keeping the head fixed, only allowing the eyes to move. The purpose of this study was to create a low-cost eye tracking system that incorporates the vestibulo-ocular reflex in gaze estimation, by keeping the head freely moving. The instrument used comprised a low-cost head-mounted webcam which recorded a single eye. Pupil detection was fully automatic and in real time with a straightforward hybrid colour-based and model-based algorithm, despite the lower-end webcam used for recording and despite the absence of direct illumination. A model-based algorithm and an interpolation-based algorithm were tested in this study. Based on mean absolute angle difference in the gaze estimation results, we conclude that the model-based algorithm performed better when the head was not moving and equally well when the head was moving. With most deviations of the points of gaze from the target points being less than 1° using either algorithm when the head is moving freely, it can be concluded that our setup performs fully within the 2° benchmark from literature, whereas deviations when the head was not moving exceeded 2°. The algorithms used were not previously tested under passive illumination. This was the first study of a low-cost eye-tracking setup taking into account the vestibulo-ocular reflex.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.23919/SAIEE.2020.9142605","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67838935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8