2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590)最新文献_第4页

Industrial innovation in a technology colony 技术殖民地的产业创新

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406822

A. Buys

{"title":"Industrial innovation in a technology colony","authors":"A. Buys","doi":"10.1109/AFRICON.2004.1406822","DOIUrl":"https://doi.org/10.1109/AFRICON.2004.1406822","url":null,"abstract":"Empirical data obtained from the South African National Innovation Survey for the period 1998-2000 shows that South Africa is a type of technological colony whose industries are dependent on foreign technology for the improvement of its products and processes. The survey found that 52% of South African firms in the manufacturing sector had technological innovations in the period 1998-2000. This figure is surprisingly high-it is the same as the European average and higher than that of many developed countries in Europe such as Italy, Norway and France. South African firms achieved this outcome with relatively few resources. The innovation expenditure in South Africa as a percentage of sales in manufacturing in 2000 was 2.6%, which is low in comparison to the European mean of 3.7%. An unexpected conclusion is that South African innovating firms are able to produce innovation outcomes that are comparable to European levels with innovation efforts that are lower than those of their counterparts. South African innovators are unique in many respects, providing some preliminary and partial explanations for this 'input-output paradox'. The sources of information for innovations as well as types of partners used by firms indicate a tendency to imitate rather than invent. The implications this has for industrial development and policymaking are discussed and some guidelines for policymaking are presented.","PeriodicalId":224116,"journal":{"name":"2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131034761","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: 6

An optimal strategy for switching devices allocation in radial distribution network 径向配电网中开关设备的最优配置策略

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406772

E. De Tuglie, M. La Scala, G. Patrono, P. Pugliese, F. Torelli

引用次数: 9

Is the new entrant telecommunications operator dead on arrival? 新进入的电信运营商会不会死在这里?

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406818

I. G. Kennedy, R. van Olst

引用次数: 1

Low complexity constant modulus based cyclic blind adaptive multiuser detection 基于低复杂度恒模的循环盲自适应多用户检测

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406644

J. Whitehead, F. Takawira

引用次数: 8

Securing a transmission channel between two remote computers with secure shell and implementing cryptography on smart card 利用安全壳保护两台远程计算机之间的传输通道，并在智能卡上实现加密

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406698

D. V. Bhatt, J. Blignaut, G. Hancke

{"title":"Securing a transmission channel between two remote computers with secure shell and implementing cryptography on smart card","authors":"D. V. Bhatt, J. Blignaut, G. Hancke","doi":"10.1109/AFRICON.2004.1406698","DOIUrl":"https://doi.org/10.1109/AFRICON.2004.1406698","url":null,"abstract":"Communication plays a very important and indeed a crucial part in our daily lives. Electronic mail, data transfer, and the development of the Internet have changed the way the world communicates. As the Internet grows in popularity and therefore also in size, more and more transmissions take place, mainly because the technology is more readily available and applications have become more user friendly, allowing entry to less sophisticated users over a broad spectrum. Intertwined herewith, is the significant increase in business related use and transmission of critical data, ultimately leading to a significant increase in security risks. This has attracted and encouraged the entry of common criminals with a high level of computer based skills. Most data transfers are mainly text based, not secure and vulnerable to various forms of security risks. The open and distributed structure of the Internet has caused this major global security problem - for businesses and the individual. In the case of an individual, a security breach is localised, whereas with businesses the implications are far reaching. Leakage of intellectual property, confidential information and/or financial information could greatly harm businesses and their stakeholders. This presentation looks at a model that uses SSH for securing an insecure channel like Internet, whilst integrating smart cards for client authentication and encryption and decryption of data","PeriodicalId":224116,"journal":{"name":"2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121452012","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: 2

Auto correlation on ultrasonic Doppler signals for pregnancy determination in sheep 超声多普勒信号在绵羊妊娠检测中的自相关性研究

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406654

P. Hertzog, G. Jordaan

{"title":"Auto correlation on ultrasonic Doppler signals for pregnancy determination in sheep","authors":"P. Hertzog, G. Jordaan","doi":"10.1109/AFRICON.2004.1406654","DOIUrl":"https://doi.org/10.1109/AFRICON.2004.1406654","url":null,"abstract":"Knowing the reproductive status of his animals (sheep in the case of this project) is of utmost importance to the modern farmer. Decisions concerning the management of the flock are influenced by knowledge of the percentage of animals that are pregnant at any specific time. The aim of the project was to gain knowledge for the development of an instrument that is affordable and with which a farmer can do pregnancy determination himself, thereby enabling him to make the correct management decisions. Experimental data were obtained from pregnant Dorper ewes with the aid of a portable Doppler instrument. By using real data as input, simulations of correlation and auto correlation were done in MathCAD. In the simulations, known levels of noise were added to the Doppler signals. Satisfactory results were obtained from the simulations of auto correlation, which led to a DSP implementation of the method. In the DSP implementation of the auto correlation method, signals with an SNR of -6.5 dB were successfully identified. It can thus be concluded that the auto correlation method can be used successfully for the detection of the fetal heartbeat in noisy ultrasonic Doppler signals","PeriodicalId":224116,"journal":{"name":"2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126486595","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: 2

Design of a frequency hopped spread spectrum (FHSS) transceiver for cellular systems 蜂窝系统跳频扩频收发器的设计

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406742

H. R. Swanepoel, S. Sinha

引用次数: 0

Parameter estimation of countercurrent ion exchange process for desalination of water 海水淡化逆流离子交换工艺的参数估计

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406719

N. Dube, R. Tzoneva

引用次数: 0

Digital watermarking for copyright protection 数字水印用于版权保护

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406827

S. Samuel, W. Penzhorn

引用次数: 20

A review on issues related to the implementation of turbo codes and space-time trellis codes 评述了turbo码和空时格码实现的相关问题

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) Pub Date : 2004-09-15 DOI: 10.1109/AFRICON.2004.1406645

J. N. Pillai, S. Mneney

引用次数: 0