Engineering Commons^™

Assessment Of The Impacts Of Climate Variability On Hydropower Generation: A Case Study Of The New Pangani Falls, Tanzania, Dativa Byarufu

Tanzania Journal of Engineering and Technology (TJET)

Climate change poses potential impacts on hydropower generation either positively by increasing or negatively by decreasing river flow. This study assessed the impacts of climate variability on hydropower with a focus on the New Pangani Falls in Tanzania. Rainfall and temperature time series data from 1980-2014 were analyzed in relation to river discharge and associated impacts to hydropower generation. The Man-Kendall test was used to detect trend in both annual and seasonal time series. The results showed a negative trend in annual rainfall with Z= -2.41 at α = 0.05 and the slope Q = -0.964. Seasonal trend analysis showed …

Performance Of Calcium Chloride- Ammonia Adsorption Refrigeration System, Michael John

Tanzania Journal of Engineering and Technology (TJET)

An experimental study on the performance of calcium chloride-ammonia adsorption system is described. A single bed water cooled condenser adsorption refrigerator prototype, which utilises calcium chloride-ammonia pair has been developed and tested in the laboratory. Experiments have been conducted for desorption temperatures of 100 °C with desorption time varying from 1 to 4 hours. An electric tape heater and a timer were used to perform the experiments. The adsorption temperature profile, adsorption rate and prototype performance have been analysed and discussed. The tested heating and desorption temperature of 100 °C and heating and desorption time of 1 to 4 hours …

Socio-Technical Perspective For Electronic Tax Information System In Tanzania, Lucas Ngowi, Ellen Kalinga

Tanzania Journal of Engineering and Technology (TJET)

Socio-technical systems theory has rarely been used by system architects in setting up computing systems. However, the role of socio-technical concepts in computing, which is becoming social in nature, has made the concepts more relevant and commercial. Tax information systems are examples of such systems because they are influenced by external variables such as the political environment, technological trends, and social environment, introducing complexity in their deployment and determining the type of e-services and their delivery to a diverse group of people. It was observed that in Tanzania there is resistance, reluctance and minimal use of electronic tax system because …

Issue 7: Contributors, David Hartshorn, Martin Jarrold

Online Journal of Space Communication

List of Issue 7 Contributors.

Future Solutions: Universal Access, David Hartshorn

Online Journal of Space Communication

Today, the nations of the world have an immediate opportunity to advance essential telecommunication policy objectives through harmonisation of regulations governing the use of fixed satellite-based network solutions.

Regulatory Reform: Strengthening Access To Information & Communications Technologies: Guidelines To Facilitate Policy & Regulation For Satellite Services, Global Vsat Forum

Online Journal of Space Communication

This document was prepared by GVF, an association of organisations engaged in the delivery of advanced broadband and narrowband satellite services to consumers, and commercial and government enterprises worldwide.

Regulatory Reform: Asia's Great Step Forward, David Hartshorn

Online Journal of Space Communication

This paper was presented at Connect-World Asia Pacific, June 2002.

Forget about a great leap forward. All that's needed to facilitate communications in Asia are a few small steps. Indeed, today all nations of the world have an immediate opportunity to advance essential telecommunication policy objectives through harmonisation of regulations governing the use of telecommunications solutions.

Regulatory Reform: Wanted: A Bridge For Africa's Digital Divide Apply: Pretty Much Anywhere In Africa Quote Reference: Vsat, Martin Jarrold

Online Journal of Space Communication

For Africa, and for the economy of the whole planet, those hundreds of millions of people across the continent who are currently denied reasonable access to even simple voice service represent a vast untapped pool of creativity. This very large and potentially very powerful economic dynamo demands access to more than the simplest tools of communication, and requires the means to unleash the potential productivity of its own knowledge-base into an increasingly connected world. The International Telecommunications Union acknowledges this, as does its sister organisation, the United Nations. The Global VSAT Forum enjoins you to acknowledge it too.

Overview: A+B+C = Vsat, Martin Jarrold

Online Journal of Space Communication

The benefits of VSAT systems and services are being realised in all spheres across the globe, both private and public. Banks, government departments, schools, hospitals, home offices, small enterprises, multi-national corporates, and rural telephony… all sectors are seizing upon the opportunity to get connected through satellite communications.

Overview: Satellite Communication In Ghana - Challenges And Prospects, Kwasi Boateng

Online Journal of Space Communication

Busy Internet is a Ghanaian ISP that uses satellite connectivity to bring Internet to West Africans. The operations of this ISP illustrate the reliability, versatility and efficiency of, VSAT, (Very Small Aperture Terminal) networks in delivering fast broadband Internet services.

Overview: Politics And Technology Converge: Case Studies On The Effects Of Regulatory Reform On Vsat Adoption In Developing Countries, Emmanuel Adugu, Kwasi Boateng, D. Flournoy, Eric Gavua, Wencelous Kaswoswe, Miao Zhang

Online Journal of Space Communication

Developing countries are actively implementing satellite data networks, and have undertaken policy reforms to facilitate such networks. This research examines how regulatory changes have resulted in the removal of barriers relating to the deployment of access technologies and growth in connectivity, especially in VSAT installations for low cost Internet access. In addition, this research seeks to identify the socio-economic impact of emerging data network applications in government, business, health and education. In some cases, government offices have been the driver of change; in other cases, businesses have been the ones to initiate and press these developments forward.

Overview: Pipelines Of The Skies, Errol Olivier

Online Journal of Space Communication

Advances in fixed satellite technology are enabling oil and gas concerns to enhance the efficiency of offshore operations with cost-effective voice and data network solutions.

Overview: Satellite Signal Security: Copyright Protection Korean Dbs Content And Transaction Security, Don Flournoy

Online Journal of Space Communication

As a result of new developments in broadband communication, residential users, office workers and those who move from place to place have more ways to access the programming and services they want when they want them.

Bridging The Digital Divide: Towards A New Paradigm, Virgil Labrador

Online Journal of Space Communication

My direct experience in the "digital divide" was when I was marketing director for a band-new state-of-the-art program origination and satellite transmission facility in Singapore seven years ago in 1996. Our first and anchor client was the highly successful Discovery Network--which housed in our facility the first all-digital channel to the Asia-Pacific market.

Strengthening Access To Communications Policy & Regulatory Guidelines For Satellite Services, David Hartshorn

Online Journal of Space Communication

This work is designed to help bridge the "Regulatory Divide" that continues to thwart end users' efforts to obtain affordable communications. From tele-medicine to distance learning to rural telecenters to disaster recovery to enterprise networks, the satellite industry is offering not only telecommunications solutions for the "have nots", but also the regulatory tools to enable the public sector to fulfill their policy objectives.

Technological Issues: A Day In The Life Of A Satcom Engineer In Nigeria, Andy Hope

Online Journal of Space Communication

The day began early, like all African days.

Social And Cultural Issues: The Impact Of Digital Divide On Development And How Satellite Addresses This Problem, Robin Gambu Wani Latio

Online Journal of Space Communication

The paper examines the problem of inaccessibility to education by the vast majority in East Africa, the factors that contribute to education problems and how the digital divide further helps isolate people in the rural communities of the region.

The author proposes satellite technology as the solution to the digital divide and offers reasons to support this proposition. Technology use in Uganda is discussed as a case study to provide further evidence that satellite communications help close the digital divide gap.

Social And Cultural Issues: Social, Cultural And Economic Issues In The Digital Divide - Literature Review And Case Study Of Japan, Shuho Otani

Online Journal of Space Communication

The definition of the digital divide generally refers to unequal access to digital and network resources, including the Internet, and opportunities to learn using information and communication technologies. The gaps are usually concerned with economic, social and cultural issues, such as income, age, education, gender, ethnic background, and physical handicaps.

Issue 5: From The Guest Editor, Bruce Elbert

Online Journal of Space Communication

This issue of the Online Journal of Space Communication focuses on a matter of social concern for which satellite technology is well-positioned to help overcome traditional communication limitations of terrain and distance. Literally the entire globe is within the reach of one satellite system or another, making it possible to extend telephone, television, radio, data and Internet communications to every corner and everybody.

Historical Development: The Alouette Program, Jack Rigley

Online Journal of Space Communication

In the 1950's at the height of the Cold War, Defence Research Bureau (DRB) laboratories, located in Ottawa, were involved in research and development to keep Canadians abreast of leading edge technology and ensure that Canadian forces were adequately equipped for their defence role.

Astronaut-Acquired Photography Of Earth: Its History And Continued Applicability In Quantitative Analyses, Jennifer Gebelein

Online Journal of Space Communication

Aerial and satellite photography has been used extensively in many different research efforts, for example, atmospheric studies, vegetation analysis, and change detection. Archives of historical aerial and satellite photography are a valuable resource to the science community.

There is currently an archive of over 450,000 photographs of Earth taken by United States astronauts dating back to the early 1960's. This archive covers the majority of the Earth's surface and offers imagery taken by a variety of camera configurations including film and digital, various lenses, different look angles, and changing solar illuminance. There is extensive repeat coverage over many regions of …

Multi-Sensor Image Registration, Fusion And Dimension Reduction, Jacqueline Le Moigne

Online Journal of Space Communication

With the development of future spacecraft formations comes a number of complex challenges such as maintaining precise relative position and specified attitudes, as well as being able to communicate with each other. More generally, with the advent of spacecraft formations, issues related to performing on-board and automatic data computing and analysis as well as decision planning and scheduling will figure among the most important requirements. Among those, automatic image registration, image fusion and dimension reduction represent intelligent technologies that would reduce mission costs,would enable autonomous decisions to be taken on-board, and would make formation flying adaptive, self-reliant, and cooperative. For …

Ohioview: A Case Study In Progress, James K. Lein

Online Journal of Space Communication

OhioView is a consortium of 10 state universities within Ohio established to promote the low-cost distribution of US Government civilian satellite data for public use. Dedicated to the goal of reducing the financial and technological barriers to use remotely sensed satellite data, OhioView has made a significant contributions to the educational, research and public use of satellite imagery through a continuing program of focused and applied land cover studies, expanded university level teaching, and public and private outreach and training. A grassroots organization formed in 1996 by its member universities, OhioView's mission is to develop remote sensing applications, create educational …

Issue 3: From The Guest Editors, Hugh Bloemer, Dale Quattrochi

Online Journal of Space Communication

What is Remote Sensing?

Solar Photovoltaic Panels Utilization To Extract Clean And Green Energy For Utility Application Using Pvsyst Software: A Bibliometric Review, Anil Bhati, Mansi Srivastava, Nitesh Aggarwal, Hardik Singh, Javed Sayyad, Paresh Nasikkar

Library Philosophy and Practice (e-journal)

This paper presents a survey on educational documents in the field of solar photovoltaic (PV) utilization to extract clean and green energy. The main purpose of this bibliometric analysis is to understand the size of the available documents for the research of PV solar panel utilization using PVsyst. This detailed review was conducted in the PV research, literature considering all subjects from the Scopus database. The pattern for the specific arrangement of keywords was separated with the recovered results from the Scopus database, publication type, year of publication, distribution conveyance by nations, subject classes, association, authors, and financing organizations. It …

Healthy Aging In Place: An Integrated Smart Home Using Alexa-Compatible Technology, Tyler Kryst

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this research was to address current healthcare concerns among the aging population. Around the globe, the average life expectancy is projected to continue increasing resulting in a higher prevalence of age-related disease. With the ever-increasing capabilities of modern technology, it is necessary to apply this technology to increase the health and safety of older adults. This work had three objectives. The first objective was the establishment of an integrated smart home aimed at creating a healthy aging-in-place environment through the use of Alexa. The second objective was the development and integration of a completely custom health device …

Are Terrorist Networks Just Glorified Criminal Cells?, Elie Alhajjar, Ryan Fameli, Shane Warren

Northeast Journal of Complex Systems (NEJCS)

The notions of organized crime and terrorism have an old and rich history around the globe. Researchers and practitioners have been studying events and phenomena related to these notions for a long time. There are pointers in the literature in which it is misleading to see the unfair comparison between terrorist and criminal networks with the argument that all actors involved in these networks are simply evil individuals. In this paper, we conduct a systematic study of the operational structure of such networks from a network science perspective. We highlight some of the major differences between them and support our …

Uav Recognition Based On Micro-Doppler Dynamic Attribute-Guided Augmentation Algorithm, Caidan Zhao, Gege Luo, Yilin Wang, Caiyun Chen, Zhiqiang Wu

Electrical Engineering Faculty Publications

A micro-Doppler signature (m-DS) based on the rotation of drone blades is an effective way to detect and identify small drones. Deep-learning-based recognition algorithms can achieve higher recognition performance, but they needs a large amount of sample data to train models. In addition to the hovering state, the signal samples of small unmanned aerial vehicles (UAVs) should also include flight dynamics, such as vertical, pitch, forward and backward, roll, lateral, and yaw. However, it is difficult to collect all dynamic UAV signal samples under actual flight conditions, and these dynamic flight characteristics will lead to the deviation of the original …

Exploring The Efficiency Of Self-Organizing Software Teams With Game Theory, Clay Stevens, Jared Soundy, Hau Chan

School of Computing: Conference and Workshop Papers

Over the last two decades, software development has moved away from centralized, plan-based management toward agile methodologies such as Scrum. Agile methodologies are founded on a shared set of core principles, including self-organizing software development teams. Such teams are promoted as a way to increase both developer productivity and team morale, which is echoed by academic research. However, recent works on agile neglect to consider strategic behavior among developers, particularly during task assignment–one of the primary functions of a self-organizing team. This paper argues that self-organizing software teams could be readily modeled using game theory, providing insight into how agile …

Matlab Modeling Of Ofdm Modulation Technique Across A 24 Khz, 48 Khz, And 3 Mhz Bandwidth In The High-Frequency Radio Band (3-30) Mhz, Josiah Myer, Tyler Collins, Sarah Taylor, Natalia Anglero

Faculty-Sponsored Student Research & Capstones

The goal of this project is to use MATLAB to model orthogonal frequency division multiplexing (OFDM) modulation technique across 24 kHz, 48 kHz, and 3 MHz bandwidths in the high frequency (HF) radio band (3-30 MHz). The purpose of our design is to make HF long distance communication faster and more reliable so that every part of the world, including the most remote parts, will have access to high speed, long distance wireless communication. Our MATLAB model will allow us to modify the bandwidth, carrier frequency, modulation type, signal to noise ratio (SNR), and image size to determine which combination …