SAIEE Africa Research Journal最新文献_第6页

Measurement-based load parameter modelling for technical and tariff studies of medium voltage feeders 中压馈线技术和电价研究中基于测量的负荷参数建模

IF 1.4

SAIEE Africa Research Journal Pub Date : 2022-03-30 DOI: 10.23919/SAIEE.2022.9785540

Johannes L. Buys;Charles T. Gaunt

{"title":"Measurement-based load parameter modelling for technical and tariff studies of medium voltage feeders","authors":"Johannes L. Buys;Charles T. Gaunt","doi":"10.23919/SAIEE.2022.9785540","DOIUrl":"10.23919/SAIEE.2022.9785540","url":null,"abstract":"Transformation in the South African power sector and new load patterns necessitated a review of load models used for financial, technical and tariff analysis. This pilot study took advantage of available data of customer measurements on medium Voltage (MV) feeders in Eskom's database. Load models with distinct profiles for typical days were developed for non-overlapping customer classes using a set of coherent parameters derived from MV chronological load profiles and the k-means algorithm. The results suggested that two profiles can be used to for summer and two profiles can be used for winter instead of using 365 hourly profiles for simulations. The results also reveal that load classification can be improved when the parameters are directed towards specific objectives, and also when the k-means algorithm is supervised using exogenous (external) parameters of loads. A comparison of the results to the economic activity class suggests that there are sub-clusters identifiable within the economic classes. The proposed process is practical, implementable with available data and suitable for various studies on MV networks.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":"113 2","pages":"64-74"},"PeriodicalIF":1.4,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/8475037/9785536/09785540.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48743960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Editors and reviewers 编辑和评审

IF 1.4

SAIEE Africa Research Journal Pub Date : 2022-03-30 DOI: 10.23919/SAIEE.2022.9785538

引用次数: 0

Personal Information Two-dimensional Code Encryption Technology in the Process of E-commerce Logistics Transportation 电子商务物流运输过程中的个人信息二维码加密技术

IF 1.4

SAIEE Africa Research Journal Pub Date : 2022-01-27 DOI: 10.23919/SAIEE.2022.9695425

Ju Ouyang;Xianping Chen

{"title":"Personal Information Two-dimensional Code Encryption Technology in the Process of E-commerce Logistics Transportation","authors":"Ju Ouyang;Xianping Chen","doi":"10.23919/SAIEE.2022.9695425","DOIUrl":"10.23919/SAIEE.2022.9695425","url":null,"abstract":"The popularity of the Internet has given birth to e-commerce and promoted the development of logistics industry. Traditional logistics is frail in personal information confidentiality, and it is easy to leak privacy information in the process of logistics. This paper briefly introduced the channels of privacy information disclosure in the process of e-commerce logistics and the privacy information encryption system based on two-dimensional code. Then, the privacy protective effect of the system was tested on the laboratory server. The results showed that mobile terminals with different permissions only obtained some necessary logistics information within their respective permissions in the normal process; the mobile terminals distinguished two-dimensional codes that did not belong to express mails, and only meaningless error codes were obtained after the mobile terminal without permissions scanned the code in the abnormal process. In conclusion, the encryption technology of personal information based on two-dimensional code can effectively protect the privacy information in the process of logistics.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":"113 1","pages":"52-57"},"PeriodicalIF":1.4,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/8475037/9693436/09695425.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46639166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Terrestrial Free Space Optical Communication Systems Availability based on Meteorological Visibility Data for South Africa 基于南非气象能见度数据的地面自由空间光通信系统可用性

IF 1.4

SAIEE Africa Research Journal Pub Date : 2022-01-27 DOI: 10.23919/SAIEE.2022.9695423

Olabamidele O. Kolawole;Thomas J. O. Afullo;Modisa Mosalaosi

{"title":"Terrestrial Free Space Optical Communication Systems Availability based on Meteorological Visibility Data for South Africa","authors":"Olabamidele O. Kolawole;Thomas J. O. Afullo;Modisa Mosalaosi","doi":"10.23919/SAIEE.2022.9695423","DOIUrl":"10.23919/SAIEE.2022.9695423","url":null,"abstract":"In spite of the numerous advantages of employing free space optical (FSO) communication systems as viable complementary platforms for next-generation networks, the presence of atmospheric disturbances such as fog and scintillations are major sources of signal impairment which degrade system performance. Consequently, it becomes imperative to investigate and contextualize the unique climatic conditions in those locations where FSO links are to be deployed. Statistical evaluation of meteorological visibility data collected for various cities in South Africa is thus hereby employed in estimating the availability performance of FSO links transmitting at both 850 nm and 1550 nm. It is determined that the cities of Mbombela and Cape Town have the lowest performance due to the high occurrence of fog events as compared to other regions in South Africa. During foggy periods, FSO links in Mbombela and Cape Town would have availabilities of ∼99.6% for link distances of 500 and 600 metres, respectively. The bit error rate (BER) estimations of intensity modulation and direct detection (IM/DD) FSO links in the presence of weak atmospheric turbulence were also investigated for the identified locations during foggy weather; with the cities of Mafikeng and Kimberley showing the lowest BER performances because of their high wind velocities, altitudes and refractive index values. In order to obtain a BER of 10\u0000<sup>−6</sup>\u0000, receive signal-to-noise ratio (SNR) values ranging from ~46 to ~51 dB are required for FSO links deployed for data transmission in the various cities investigated in this work.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":"113 1","pages":"20-36"},"PeriodicalIF":1.4,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/8475037/9693436/09695423.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46955960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Editors and reviewers 编辑和审稿人

IF 1.4

SAIEE Africa Research Journal Pub Date : 2022-01-27 DOI: 10.23919/SAIEE.2022.9695420

引用次数: 0

Notes for authors 作者须知

IF 1.4

SAIEE Africa Research Journal Pub Date : 2021-11-01

引用次数: 0

How assessment shapes learning: A perspective from engineering students 评估如何塑造学习：来自工科学生的视角

IF 1.4

SAIEE Africa Research Journal Pub Date : 2021-11-01

Teresa S. Hattingh;Laura Dison

{"title":"How assessment shapes learning: A perspective from engineering students","authors":"Teresa S. Hattingh;Laura Dison","doi":"","DOIUrl":"https://doi.org/","url":null,"abstract":"This study explores the influence of assessment on student approaches to learning through the voice of the student. The aim is to understand how assessment practices in an engineering school shape how students respond through their learning approaches and behaviors. The study is framed using a learning-oriented assessment paradigm. Focus groups were conducted with second-, third- and fourth-year engineering students. Four groups were formed using academic performance as a sampling criterion. The findings are presented using selected emergent themes and rich, narrative descriptions. A range of expected and unexpected student responses to assessment practices is highlighted. These are discussed in the context of the assessment literature to provide insight into the relationship between assessment and learning. The study confirms the importance of constructive alignment in assessment design, and includes specific findings related to tutorials, assignments, feedback, and group work. The study reveals that assessment is a powerful driver of learning, and highlights the need for a more collaborative teaching and learning environment to shift learning in a positive direction.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":"112 4","pages":"161-170"},"PeriodicalIF":1.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/8475037/9580763/09580769.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67864428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ethics in engineering education 4.0: The educator's perspective 工程教育4.0中的伦理学：教育者的视角

IF 1.4

SAIEE Africa Research Journal Pub Date : 2021-11-01

Bronwyn Swartz

{"title":"Ethics in engineering education 4.0: The educator's perspective","authors":"Bronwyn Swartz","doi":"","DOIUrl":"https://doi.org/","url":null,"abstract":"The advent of the fourth industrial revolution (4IR) has had an all-pervasive influence on virtually every aspect of high-quality manufacturing and associated services. Consequently, it triggered increasing industry demand to drive technological transformation. By implication, this propelled transformation in the requirements of Higher Education (HE) during the process of training engineers, towards more blended or online modes of delivery. A common concern from commentators has been “What are the ethical implications of using technology when teaching engineering students”. The objective of this paper is to expand on a previously published literature study which theoretically examined the extent to which ethics has been considered during the process of training engineers in contemporary times. In this follow-up study, a survey research instrument (n=68) which included eight likert scale questions and ten open-ended questions, was used to empirically explore three ethical dilemmas which emerged during the precursor study. The ethical dilemmas are (1) the unintended negative consequences of using technology; (2) discrimination as a result of the use of technology and (3) educator agency in the Engineering Education 4.0, at a University of Technology (UoT) in South Africa. Ethical clearance to do this research was secured through institutional channels. The findings of this study were consistent with findings of the precursor study and the recommendation of this study is that a series of workshops be held to develop ethics guidelines and establish ethical best practices to assist engineering educators to assure the quality of online engineering education, avoid discrimination, protect the privacy of both students and educators and reinforce the integrity of online engineering assessments.","PeriodicalId":42493,"journal":{"name":"SAIEE Africa Research Journal","volume":"112 4","pages":"181-188"},"PeriodicalIF":1.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/8475037/9580763/09580771.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67864422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Guest editorial: Engineering education 客座编辑：工程教育

IF 1.4

SAIEE Africa Research Journal Pub Date : 2021-11-01

引用次数: 0

IEEE Xplore digital library indexes the Transactions of the SAIEE, 1909 to date IEEE Xplore数字图书馆索引了1909年至今的SAIEE汇刊

IF 1.4

SAIEE Africa Research Journal Pub Date : 2021-11-01

Saurabh Sinha;Beatrys Lacquet;B.T.J. Maharaj

引用次数: 0