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Understanding mobile phone battery - Human interaction for developing world: A perspective of feature phone users in Africa

Understanding mobile phone battery - Human interaction for d...

引用

2012 2nd Baltic Congress on Future Internet Communications, BCFIC 2012

作者： Dhir, Amandeep Kaur, Puneet Jere, Nobert Albidewi, Ibrahim A. Department of Computer Science and Engineering School of Science Aalto University Finland Department of Information and Service Economy School of Economics Aalto University Finland Telkom Center of Excellence in ICTD Computer Science Department University of Fort Hare South Africa Information Systems Department King Abdulaziz University Saudi Arabia

ISBN: (纸本)9781467316712

Mobile phone battery is well recognized as an open usability concern for both device manufacturers and end users. Due to the ubiquitous nature of mobile phones, battery related problems have received increasing attention in the scientific conferences. In our paper, we have presented the need for understanding and investigating Human Battery Interaction for Development (HBI4D). In our study we are mainly interested in the non-smartphone or feature phone users who belong from low income;low literacy and resource limited areas. This would enable us in understanding the existing design opportunities available for developing and designing energy efficient mobile battery solutions for emerging markets. Our work is first of its kind as almost all the existing work on battery efficiency is targeted towards smartphone users from western world. However, our work mainly comprises of users from emerging markets such as India, China and South Africa. © 2012 IEEE.

关键词： Smartphones

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Closed-Form Evaluation of Area under the ROC of Cooperative Relay-Based Energy Detection in Cognitive Radio Networks

Closed-Form Evaluation of Area under the ROC of Cooperative ...

引用

International Conference on Computing, Networking and Communications

作者： O. Olabiyi A. Annamalai Center of Excellence for Communication Systems Technology Research Department of Electrical and Computer Engineering Prairie View A&M University

ISBN: (纸本)9781467300087

In this article, we develop a closed form evaluation of the area under receiver operating characteristics (ROC) curve (AUC) when employed in the analysis of cooperative amplify-and-forward (CAF) relay-based energy detection. The developed analytical expression for AUC results into finite kth order derivative of the moment generating function of the end-to-end signal-to-noise ratio. The resulting closed-form expressions can be easily generalized across different fading channels and multi-relay system. We first consider a single amplify-and-forward (AF) relay based sensing and later extend the framework to multi-relay system. Both options of maximum ration combining (MRC) and square-law combining are analysed. We found out that direct sensing performs better than single relay sensing under certain scenario. However, the sensing performance is greatly enhanced when both direct and relay based sensing are combined to form a CAF relay detection system. Also, we show that MRC CAF relay sensing outperforms their corresponding SLC CAF relay sensing.

关键词： Energy detection Cognitive radio Fading channels Maximum selection combining Square-law selection Cooperative amplify-and-forward Sensing

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ESPAR_DRA phased array

ESPAR_DRA phased array

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IEEE International Conference on Wireless Information Technology and systems (ICWITS)

作者： Mohammad Ranjbar Nikkhah Jalil Rashed-Mohassel Ahmed A. Kishk Center of Excellence on Applied Electromagnetic Systems University of Tehran Iran Department of Electrical and Computer Engineering Concordia University Canada

A new dielectric resonator ESPAR antenna phased array was investigated. The array showed ± 30° scanning capabilities. The array was matched for all the scanning directions and achieved a gain better than 8dBi.

关键词： Arrays Dielectric resonator antennas Dielectrics Microstrip antennas Microstrip Phased arrays Loading

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Some remarks on the Dirac delta function approximation for ASER analysis of digital modulations over fading channels

Some remarks on the Dirac delta function approximation for A...

引用

MILCOM, Military Communications Conference

作者： E. Adebola O. Olabiyi A. Annamalai Center of Excellence for Communication Systems Technology Research Department of Electrical and Computer Engineering Prairie View A and M University TX USA

In this article, we apply two distinct methods to obtain simple closed-form approximations for the average symbol error rate (ASER) performance metric of a broad class of coherent digital modulations in a myriad of fading environments (with/without diversity), which are known to be analytically involved as they require evaluation of the expectation of the Gaussian Q-function and/or its integer powers. In the first approach, we exploit the shifting property of Dirac delta approximations of the Q-function to circumvent the need for integration. In the second approach, we introduce tight exponential-type approximations for the Q-function that directly lead to the development of closed-form expressions for the ASER in terms of only the moment generating function (MGF) of the received signal-to-noise ratio (SNR) random variable. Numerical results reveal that our proposed solutions based on the MGF method are much more versatile and can yield better accuracy compared to our approximations derived via the Dirac delta approximation technique.

关键词： Decision support systems TV

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Generation of steerable continuous-wave terahertz radiation using large-area photomixer

Generation of steerable continuous-wave terahertz radiation ...

引用

Microwave, MTT-S International Symposium

作者： Armaghan Eshaghi Mahmoud Shahabadi Lukas Chrostowski Department of Electrical and Computer Engineering University of British Columbia Vancouver Canada School of Electrical and Computer Engineering College of Engineering Center of Excellence on Applied Electromagnetics Systems University of Tehran Tehran Iran

Generation of continuous-wave (CW) terahertz (THz) radiation with a power of 2µW is demonstrated. Two CW laser beams of wavelengths around 800nm are photomixed in a large-area photomixer to generate a THz radiation of 1.2THz. The utilized photomixer has interdigitated contacts with desirable radiation characteristics in the far-field region. We show that the radiated THz beam is steerable by changing the incidence angles of the CW pump beams. In our experimental setup, the emission direction of the large-area photomixer can be steered by rotating the beam splitter used for beam combining. Using this setup, we are able to steer the THz beam in a range of −30 to +30 degrees.

关键词： Laser beams Measurement by laser beam Surface emitting lasers Laser excitation Antennas Photoconducting materials Power lasers

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Novel characteristics of a line source radiation on top of a grounded slab covered with a graphene sheet

Novel characteristics of a line source radiation on top of a...

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International Symposium on Telecommunications, IST

作者： Hossein Hatefi Ardakani Jalil Rashed-Mohassel Zahra Ghattan Kashani Mohammad Keramat Amirkalaee Iran Telecommunications Research Center Tehran Iran Center of Excellence on Applied Electromagnetic Systems Electrical and Computer Engineering Department University of Tehran Tehran Iran

In this paper, the problem of a line source radiation on top of a grounded dielectric slab covered with a graphene sheet is analyzed through the method of plane waves expansion. It is demonstrated that besides providing the tunability of radiation parameters, existence of graphene on top of the substrate, eliminates the effect of image current and stabilizes the radiation pattern for a very large frequency range. As a result, the radiation bandwidth can be significantly increased by choosing an appropriate value for the chemical potential μ c .

关键词： Graphene Chemicals Slabs Bandwidth Electric fields Conductivity Electric potential

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Analysis of graphene-based multilayer structures using spectral domain technique

Analysis of graphene-based multilayer structures using spect...

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International Symposium on Telecommunications, IST

作者： Hossein Hatefi Ardakani Zahra Ghattan Kashani Mohammad Keramat Amirkalaee Jalil Rashed-Mohassel Iran Telecommunications Research Center Tehran Iran Center of Excellence on Applied Electromagnetic Systems Electrical and Computer Engineering Department University of Tehran Tehran Iran

In this paper, a generic multilayer structure containing metals, dielectrics and graphene sheets is considered and analyzed. The spectral domain techniques (SDTs) have been known as an efficient method for analysis of planar structures. But since the existence of graphene sheet imposes a new boundary condition; the conventional SDTs cannot deal with it. Therefore, a spectral-based method is proposed by applying the two dimensional Fourier transform to the fields equations. First, without loss of generality, a graphene sheet described with a conductivity tensor is assumed to be placed between two arbitrary dielectric layers. A generalized transformation matrix is then calculated where relates the electromagnetic fields of the top layer in terms of the ones of the bottom layer. It is shown that considering the tangential electric fields as supporting field components makes an easier analysis and results in more simplified expressions. The proposed method is evaluated through some examples. Some novel characteristics are observed which are promising in providing new applications.

关键词： Graphene Equations Dielectrics Conductivity Nonhomogeneous media Mathematical model Electric fields

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Cross-layer throughput optimization for delay and QoS constrained applications

Cross-layer throughput optimization for delay and QoS constr...

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MILCOM, Military Communications Conference

作者： E. Adebola O. Olabiyi A. Annamalai Center of Excellence for Communication Systems Technology Research (CECSTR) Department of Electrical and Computer Engineering Prairie View A and M University TX USA

In this article we recast the problem of throughput optimization in cross-layer architecture for delay sensitive applications. Unified mathematical framework was developed for maximizing user throughput in generalised wireless environment. The optimization variables adapted include symbol rate (at the application layer), packet length (at the MAC layer), constellation size (at the physical layer) and number of retransmissions of M-PSK digital modulation schemes. We derive optimization equations for each of the above degrees of freedom in closed-form which maximizes the throughput subject to a prescribed packet loss probability constraint. Interior-point optimization algorithm was used to solve the resultant constrained non-linear optimization problem. Numerical results reveal that no successful packet decoding is possible at very low average signal-to-noise (SNR) regime as the packet loss constraint is not met when channel condition is very bad irrespective of adaption. At moderately low SNR, it is sufficient to adapt packet length while keeping symbol rate fixed at the maximum value while joint optimization of both the number of retransmissions and the constellation size parameters while keeping the packet length at an appropriate value is required in the high average SNR regime, to achieve maximum throughput over a myriad of wireless fading environments. Results also showed that the tighter the packet loss constraint, the lower the throughput becomes.

关键词： Decision support systems

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Joint-design of PHY/MAC layers for throughput optimization

Joint-design of PHY/MAC layers for throughput optimization

引用

Consumer Communications and Networking Conference, CCNC IEEE

作者： O. Olabiyi E. Adebola A. Annamalai O. Odejide Center of Excellence for Communication Systems Technology Research (CECSTR) Department of Electrical and Computer Engineering Prairie View A and M University TX USA

This article develops a unified analytical framework for maximizing the user throughput of a cooperative multi-relay network over generalized wireless channels using the symbol rate, packet length and constellation size of M-ary PSK/QAM digital modulation schemes as optimization variables. Optimization equations for each of the above degrees of freedom are derived in closed-form. A low-complexity discrete optimization algorithm for finding the “optimal” parameter-triplet is also developed to solve the resulting non-linear joint optimization problem. Numerical results reveal that it is sufficient to adapt the number of cooperating relay nodes as well as the symbol rate in the low SNR regime while a joint-optimization of both the packet length and the constellation size parameters is desirable in the high SNR regime to achieve the maximum throughput.

关键词： Signal to noise ratio Throughput Relays Optimization Fading Modulation Equations

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Linear regression based statistical approach for detecting proportion of component gases in manhole gas mixture

Linear regression based statistical approach for detecting p...

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International Symposium on Physics and Technology of Sensors (ISPTS)

作者： Varun Kumar Ojha Paramartha Dutta Hiranmay Saha Sugato Ghosh Department of Computer & System Sciences Visva-Bharati University Santiniketan India Center of Excellence for Green Energy & Sensor Systems Bengal Engineering & Science University Shibpur India

The present article proposes the issues in designing an intelligent recognizer for detecting proportion of component gases in manhole gas mixture. The major components found in manhole gas mixture are Hydrogen Sulfide (H 2 S), Ammonia (NH 3 ), Methane (CH 4 ), Carbon Dioxide (CO 2 ), Nitrogen Oxide (NO x ), and Carbon Monoxide (CO). The manhole gas is formed after the decomposition of waste products, domestic garbage etc. into the sewer pipelines which are built for exhausting these waste products out of our cities and towns. The manholes are built across these pipelines for cleaning purpose. Thus safety for the people working in this field is a matter of concern because all the above mentioned gases are harmful gases and they are potent to loss of human lives. Also detection of these gas components is of primary concern today as because a short exposure of these components with human physiology results endanger to their lives. So our focus is on developing an intelligent gas recognition system which can recognize multiple gases simultaneously. A gas sensor array is an array of sensors, consisting of two or more electrical type semiconductor gas sensors. Response of electrical type semiconductor gas sensors in presence of gases are either the change in resistance or change in voltage of the sensor. At an instant a gas sensor array contains as many sensors as many individual gases we are targeting to detect. Use of multiple gas sensors and presence of multiple gases together results cross-sensitivity. The cross-sensitivity is an overlapping effect of one gas on another sensor. We adopt linear regression based statistical approach to deal with issues of simultaneous detection of multiple gases notwithstanding cross-sensitivity issue.

关键词： Gas detectors Gases Sensor arrays Linear regression Sensitivity

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