scholarly journals Kinematics modeling analysis of the geostationary satellite monitoring antenna system

2021 ◽  
Vol 4 (1) ◽  
pp. first
Author(s):  
Duong Xuan Bien ◽  
Pham Quoc Hoang ◽  
Le Xuan Hung ◽  
Do Manh Tung ◽  
Nguyen Tai-Hoai Thanh ◽  
...  
Keyword(s):  
Developing Countries ◽  
Mechanical System ◽  
Communication Technology ◽  
Antenna System ◽  
Geostationary Satellite ◽  
Satellite Monitoring ◽  
Space Technology ◽  
Modeling Analysis ◽  
Kinematics Modeling ◽  
Antenna Systems

The trend of scientific development in the future cannot fail to mention the great influence of the space field, but in the immediate future, the observational satellite systems are related to communication technology. In fact, in some countries with strong development of communication technology and space technology, the mechanical system of geostationary satellite monitoring antennas has certainly been thoroughly resolved. However, because of a specific technology, the sharing and transferring of design and manufacturing technology to developing countries is a great challenge. It is almost difficult to find published works related to mechanical design calculation and manufacture of geostationary satellite monitoring antenna systems. The problem of proactive grasping of technology, step by step autonomy in manufacturing technology of telecommunications equipment related to space technology has always been the goal of developing countries like Vietnam to limit technology dependence, minimizing technology transfer costs, ensuring national security. The first step in these problems is the autonomous construction of terrestrial transceivers such as geostationary satellite monitoring antennas. This paper presents the kinematics modeling analysis of the mechanical system of the geostationary satellite monitoring antenna. Each component of the antenna system is assumed a rigid body. The mathematical model is built based on multi-bodies kinematics and dynamics theory. The DENAVIT-HARTENBERG (D-H) homogeneous matrix method was used to construct the kinematics equations. The forward kinematics problem is analyzed to determine the position, velocity, acceleration, and workspace of the antenna system with given system motion limits. The inverse kinematics problem is mentioned to determine the kinematics behaviors of the antenna system with a given motion path in the workspace. The numerical simulation results kinematics were successfully applied in practice, especially for dynamics and control system analysis of geostationary satellite antenna systems.

Fade Statistic Analysis of SC in Distributed Antenna System

2013 ◽  
Vol 336-338 ◽  
pp. 1708-1712
Author(s):  
Lei Li ◽  
Xiao Dong Wang
Keyword(s):  
Antenna System ◽  
Multiple Antenna ◽  
Level Crossing ◽  
Distributed Antenna System ◽  
Level Crossing Rate ◽  
Composite Fading ◽  
Distributed Antenna ◽  
Diversity Gains ◽  
Antenna Systems ◽  
Average Fade Duration

Exact and closed form expressions for the average level crossing rate (LCR) and average fade duration (AFD) of the output signal envelope of selection diversity system are derived, assuming each branch is subject to independent but nonidentical composite fading in distributed antenna systems (DAS). Numerical results validate the derived expressions. It shows that DAS promise significant diversity gains over collocated multiple antenna system.

scholarly journals Curriculum Development of an ICT4D Module in the South African Context

10.28945/2181 ◽  
2015 ◽  
Vol 12 ◽  
pp. 111-139
Author(s):  
Caroline Khene
Keyword(s):  
Developing Countries ◽  
South African ◽  
Information And Communication Technology ◽  
Communication Technology ◽  
Theoretical Study ◽  
South African Context ◽  
The South ◽  
Information And Communication ◽  
African Context ◽  
Discipline Knowledge

The significance of ICTs in supporting socio-economic development in developing countries is inevitable. As academics of information systems in developing countries, we cannot ignore the need for teaching and building the capacity of our students to become knowledgeable and skilled in Information and Communication Technology for Development (ICT4D) practice and discourse. Furthermore, it is vital to equip our students with the ability to apply their discipline knowledge in addressing some of the ICT discrepancies in current ICT4D practice in their own context. I introduced and teach the ICT4D module to the Honours level course at my university in South Africa. This paper explores the factors that have influenced and shaped the development of the ICT4D module curriculum in the South African context I teach in, using a qualitative ethnographic lens and theoretical study. This provides a practice lens to motivate for and support the introduction of an ICT4D module in tertiary curricula in developing countries.

scholarly journals Environmental Sensitivity of Large Stealth Longwave Antenna Systems

2021 ◽  
Vol 13 (19) ◽  
pp. 3946
Author(s):  
Tomasz Aleksander Miś ◽  
Józef Modelski
Keyword(s):  
Environmental Monitoring ◽  
Water Content ◽  
Magnetic Loop ◽  
Antenna System ◽  
Loop Antenna ◽  
Soil Composition ◽  
Environmental Sensitivity ◽  
Good Compliance ◽  
Basic Functions ◽  
Antenna Systems

This article presents an analysis of measurements collected during a six-month-long experimental deployment of a surface-placed horizontal magnetic loop antenna. The changes in the measured parameters of the loop are investigated in relation to the surrounding environment’s composition, temperature and water content. Basic functions describing these changes are formulated. The results are confronted with outcomes from similar experiments from previous years and different locations, showing good compliance. The developed functions and antenna system can be used for environmental monitoring of soil composition and humidity over large areas and volumes, helpful in, for example, flood awareness.

Disaster and Digital Libraries in Developing Countries

2016 ◽  
pp. 534-559 ◽  
Author(s):  
Goodluck Ifijeh ◽  
Jerome Idiegbeyan-Ose ◽  
Chidi D. Isiakpona ◽  
Julie Ilogho
Keyword(s):  
Developing Countries ◽  
Information And Communication Technology ◽  
Disaster Management ◽  
Communication Technology ◽  
Digital Libraries ◽  
Prevention And Control ◽  
Information And Communication ◽  
Information Generation ◽  
And Control ◽  
And Storage

Digital libraries have become a modern day phenomenon. Their roles in information generation,organization, dissemination and storage cannot be overemphasized. This chapter articulates the importance of digital libraries and the need to preserve them from disasters. It highlights the causes and effects of disasters in digital libraries. Prevention and management of disasters were also discussed. Issues and challenges around information and communication technology (ICT), that has direct bearings on digital libraries and disaster management in developing countries were raised. In addition, recommendations were made on how to improve on disaster prevention and control.

Information and Communication Technology in Singapore

2011 ◽  
pp. 293-311
Author(s):  
Leo Tan Wee Hin ◽  
R. Subramaniam
Keyword(s):  
Developing Countries ◽  
Information And Communication Technologies ◽  
Information And Communication Technology ◽  
Communication Technology ◽  
Value Chain ◽  
Socioeconomic Development ◽  
Economic Value ◽  
Communication Technologies ◽  
Information And Communication

Information and Communication Technologies (ICT) hold great potential for promoting socioeconomic development in many developing countries. ICT has not significantly percolated down the economic value chain in these countries for various reasons. The example of Singapore is used to show how governments can make a difference in entrenching a vibrant ICT sector through appropriate policies, programs, and other intervention instruments. It is suggested that aspects of the Singapore experience would be useful for other developing countries.

ICT Ethical Issues, Globalization and Knowledge Society

2012 ◽  
pp. 78-88
Author(s):  
Maslin Masrom ◽  
Zuraini Ismail
Keyword(s):  
Developing Countries ◽  
Human Rights ◽  
Gender Equality ◽  
Communication Technology ◽  
Ethical Issues ◽  
Knowledge Society ◽  
Societal Transformation ◽  
Information And Communication ◽  
And Gender ◽  
Wealth Generation

In this chapter, the authors will parse the current ethical issues in the information and communication technology research associated with the economic phenomenon of globalization. These issues will include: the digital divide between developed and developing countries, poverty, piracy, cybercrimes, human rights, and gender equality. The chapter will go on to discuss themes in the development of the “knowledge society” that are germane to the ethics of globalization such as societal transformation and wealth generation. The chapter will develop a framework that will associate ICT ethical issues with knowledge society. Finally, the authors will present conclusions and details some of the findings discussed in the previous sections. A glimpse of the future will be provided.

The Changing World of ICT and Health

2011 ◽  
pp. 111-128
Author(s):  
Prajesh Chhanabhai ◽  
Alec Holt
Keyword(s):  
Developing Countries ◽  
Health Information ◽  
Mobile Phones ◽  
Communication Technology ◽  
Rapid Change ◽  
Healthcare Sector ◽  
The Internet ◽  
Communication Techniques ◽  
Health Consumer ◽  
Information And Communication

Information and Communication Technology (ICT) has undergone rapid change in the last decade and it is now readily accessible within many communities. This change has resulted in a revolution in the healthcare sector as technology has steadily empowered the health consumer. However, the problem of the digital divide remains and may be widening with the growth of technology. This chapter will examine how developing countries have overcome this problem by using varying communication techniques to share health information. The chapter also suggests how mobile phones can provide a more accessible conduit for sharing health information in developing countries as opposed to the Internet alone. These changes need to be embraced in order to provide a framework that will allow ICT to narrow, rather than widen the gap between the information poor and the information rich.

ICT in Medical Education in Trinidad and Tobago

2008 ◽  
pp. 2008-2013
Author(s):  
Marilyn Lewis
Keyword(s):  
Developing Countries ◽  
Medical Education ◽  
Economic Development ◽  
Trinidad And Tobago ◽  
Information And Communication Technology ◽  
Communication Technology ◽  
Geographic Position ◽  
Information And Communication ◽  
Access Information ◽  
Physically Challenged

Information and communication technology (ICT) allows users to access information without taking geographic position into account. These users are also unconstrained by time, volume, or format of the information. ICT applications have enormous potential as a tool for aiding development in countries such as Trinidad and Tobago. Telemedicine, which can provide medical services to persons in isolated places, in emergencies, to the homebound, or the physically challenged, is but one example. Mansell and Wehn de Montalvo (1998) noted that “ICT applications facilitate telemedicine” (p. 85), and that “economic development can be fostered by tele-working and tele-services in some developing countries” (p. 83).

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