David Jazani - Academia.edu (original) (raw)

Papers by David Jazani

Abstract Sustainability rules, but at what cost? As we are forced into more energy efficient desi... more Abstract Sustainability rules, but at what cost? As we are forced into more energy efficient design, we are moving more and more towards the use of timber. The industry is happily taking on ideas of gurus, timber is sustainable! More timber, the industry has gone from baloon/western framing to cassette construction, the use of engineered timber is on the rise. Because of the efficiency of engineered timbers the uptake is tremendously rapid, happy designers, constructors and customers? Let us examine the whole idea. Managed forests and saving of virgin forests We are trying to do things sustainably and preserve the natural virgin forests, this is why we are promoting forests that are managed. Regretfully these are still not sufficient in size, number and age. Commercial pressures to harvest also create pressures on the output of these forests subsequently producing relatively young trees of small girth. Yes these are easier to harvest and process due to small size, close proximity of...

IET Conference on Wireless Sensor Systems (WSS 2012), 2012

We present a method for powering electronic devices from ambient Radio Frequency (RF) signals. Ou... more We present a method for powering electronic devices from ambient Radio Frequency (RF) signals. Our proposed design of RF energy harvester is made of a compact ferrite rod antenna together with the electronics necessary for converting the received signal into a form that can directly replace batteries. We show that our device can, in principal, power a wireless sensor node from ambient medium wave transmissions so long as the node is within 120 km of a 150kW transmitter.

Proceedings of the 9th IEEE International Conference on Collaborative Computing: Networking, Applications and Worksharing, 2013

The scope of this paper is two-fold: firstly it proposes the application of a 1-2-3 Zones approac... more The scope of this paper is two-fold: firstly it proposes the application of a 1-2-3 Zones approach to Internet of Things (IoT)-related Digital Forensics (DF) investigations. Secondly, it introduces a Next-Best-Thing Triage (NBT) Model for use in conjunction with the 1-2-3 Zones approach where necessary and vice versa. These two 'approaches' are essential for the DF process from an IoT perspective: the atypical nature of IoT sources of evidence (i.e. Objects of Forensic Interest -OOFI), the pervasiveness of the IoT environment and its other unique attributes -and the combination of these attributes -dictate the necessity for a systematic DF approach to incidents. The two approaches proposed are designed to serve as a beacon to incident responders, increasing the efficiency and effectiveness of their IoT-related investigations by maximizing the use of the available time and ensuring relevant evidence identification and acquisition. The approaches can also be applied in conjunction with existing, recognised DF models, methodologies and frameworks.

The Journal of Engineering, 2013

Radio frequency (RF) energy harvesting is an emerging technology that has the potential to elimin... more Radio frequency (RF) energy harvesting is an emerging technology that has the potential to eliminate the need for batteries and reduce maintenance costs of sensing applications. The antenna is one of the critical components that determines its performance and while antenna design has been well researched for the purpose of communication, the design for RF energy harvesting applications has not been widely addressed. The authors present an optimised design for such an antenna for harvesting energy from medium wave broadcast transmissions. They derive and use a model for computing the optimal antenna configuration given application requirements on output voltage and power, material costs and physical dimensions. Design requirements for powering autonomous smart meters have been considered. The proposed approach was used to obtain the antenna configuration that is able to deliver 1 mW of power to 1 kΩ load at a distance of up to 9 km, sufficient to replace batteries on low-power sensing applications. Measurements using a prototype device have been used to verify the authors simulations. † transmitted power, frequency, transmitter antenna, receiver antenna and distance from the transmitter (i.e. Friis equation). † physical environment between the transmitter and device, that is, path loss. † design of the device itself, that is, antenna efficiency, circuit efficiency and power requirements. Fig. 1 Block diagram of a generic energy harvester

2012 Loughborough Antennas & Propagation Conference (LAPC), 2012

ABSTRACT Harvesting energy from ambient radio signals is claimed to hold much innovation potentia... more ABSTRACT Harvesting energy from ambient radio signals is claimed to hold much innovation potential. Advances in ultra-low power electronics, an appetite for reducing the environmental footprint of technology and the business need for enabling new applications such as sensing in inaccessible locations are widely believed to be drivers. We review these drivers, and recent technological advances to reveal what potential there is by harvesting energy from ambient radio signals. Particular attention is given to the possibility of powering smart meters in this way.

Electronics Letters, 2014

An optimised design of a radio frequency energy harvesting antenna is presented. The antenna is b... more An optimised design of a radio frequency energy harvesting antenna is presented. The antenna is based on a compact ferrite rod which, together with the electronics, can directly replace batteries in suitable applications. The antenna is optimised such that the energy available for the applications is maximised, while considering constraints such as the device geometry and the Q-factor. That the antenna can power a wireless sensor node is shown from the ambient medium wave transmissions.

The smart grid promises a myriad of benefits for both the consumer and energy service providers. ... more The smart grid promises a myriad of benefits for both the consumer and energy service providers. However, realising its potential is subject to solving a number of complex issues. One of the major directions of smart grid research is demand response modelling that aimed at reducing the peak demand and billing by introducing appropriate real time pricing. The main difficulty is in managing the optimum pricing on a real time basis. In this paper, we will provide a state of the art review of an existing approach that models demand response in real time and also the underlying model that is tested with real data by using a stochastic iterative process with simultaneous perturbation stochastic approximation algorithm. Our model shows that real time price is better than a flat rate price. We will provide a brief outlook to the future where we propose a model that takes complex customers' behaviour into consideration. The proposed model includes a real time Price Suggestion Unit (PSU) that assists users to further reduce their electricity price while reducing the aggregate load for the energy providers.

Abstract Sustainability rules, but at what cost? As we are forced into more energy efficient desi... more Abstract Sustainability rules, but at what cost? As we are forced into more energy efficient design, we are moving more and more towards the use of timber. The industry is happily taking on ideas of gurus, timber is sustainable! More timber, the industry has gone from baloon/western framing to cassette construction, the use of engineered timber is on the rise. Because of the efficiency of engineered timbers the uptake is tremendously rapid, happy designers, constructors and customers? Let us examine the whole idea. Managed forests and saving of virgin forests We are trying to do things sustainably and preserve the natural virgin forests, this is why we are promoting forests that are managed. Regretfully these are still not sufficient in size, number and age. Commercial pressures to harvest also create pressures on the output of these forests subsequently producing relatively young trees of small girth. Yes these are easier to harvest and process due to small size, close proximity of...

IET Conference on Wireless Sensor Systems (WSS 2012), 2012

We present a method for powering electronic devices from ambient Radio Frequency (RF) signals. Ou... more We present a method for powering electronic devices from ambient Radio Frequency (RF) signals. Our proposed design of RF energy harvester is made of a compact ferrite rod antenna together with the electronics necessary for converting the received signal into a form that can directly replace batteries. We show that our device can, in principal, power a wireless sensor node from ambient medium wave transmissions so long as the node is within 120 km of a 150kW transmitter.

Proceedings of the 9th IEEE International Conference on Collaborative Computing: Networking, Applications and Worksharing, 2013

The scope of this paper is two-fold: firstly it proposes the application of a 1-2-3 Zones approac... more The scope of this paper is two-fold: firstly it proposes the application of a 1-2-3 Zones approach to Internet of Things (IoT)-related Digital Forensics (DF) investigations. Secondly, it introduces a Next-Best-Thing Triage (NBT) Model for use in conjunction with the 1-2-3 Zones approach where necessary and vice versa. These two 'approaches' are essential for the DF process from an IoT perspective: the atypical nature of IoT sources of evidence (i.e. Objects of Forensic Interest -OOFI), the pervasiveness of the IoT environment and its other unique attributes -and the combination of these attributes -dictate the necessity for a systematic DF approach to incidents. The two approaches proposed are designed to serve as a beacon to incident responders, increasing the efficiency and effectiveness of their IoT-related investigations by maximizing the use of the available time and ensuring relevant evidence identification and acquisition. The approaches can also be applied in conjunction with existing, recognised DF models, methodologies and frameworks.

The Journal of Engineering, 2013

Radio frequency (RF) energy harvesting is an emerging technology that has the potential to elimin... more Radio frequency (RF) energy harvesting is an emerging technology that has the potential to eliminate the need for batteries and reduce maintenance costs of sensing applications. The antenna is one of the critical components that determines its performance and while antenna design has been well researched for the purpose of communication, the design for RF energy harvesting applications has not been widely addressed. The authors present an optimised design for such an antenna for harvesting energy from medium wave broadcast transmissions. They derive and use a model for computing the optimal antenna configuration given application requirements on output voltage and power, material costs and physical dimensions. Design requirements for powering autonomous smart meters have been considered. The proposed approach was used to obtain the antenna configuration that is able to deliver 1 mW of power to 1 kΩ load at a distance of up to 9 km, sufficient to replace batteries on low-power sensing applications. Measurements using a prototype device have been used to verify the authors simulations. † transmitted power, frequency, transmitter antenna, receiver antenna and distance from the transmitter (i.e. Friis equation). † physical environment between the transmitter and device, that is, path loss. † design of the device itself, that is, antenna efficiency, circuit efficiency and power requirements. Fig. 1 Block diagram of a generic energy harvester

2012 Loughborough Antennas & Propagation Conference (LAPC), 2012

ABSTRACT Harvesting energy from ambient radio signals is claimed to hold much innovation potentia... more ABSTRACT Harvesting energy from ambient radio signals is claimed to hold much innovation potential. Advances in ultra-low power electronics, an appetite for reducing the environmental footprint of technology and the business need for enabling new applications such as sensing in inaccessible locations are widely believed to be drivers. We review these drivers, and recent technological advances to reveal what potential there is by harvesting energy from ambient radio signals. Particular attention is given to the possibility of powering smart meters in this way.

Electronics Letters, 2014

An optimised design of a radio frequency energy harvesting antenna is presented. The antenna is b... more An optimised design of a radio frequency energy harvesting antenna is presented. The antenna is based on a compact ferrite rod which, together with the electronics, can directly replace batteries in suitable applications. The antenna is optimised such that the energy available for the applications is maximised, while considering constraints such as the device geometry and the Q-factor. That the antenna can power a wireless sensor node is shown from the ambient medium wave transmissions.

The smart grid promises a myriad of benefits for both the consumer and energy service providers. ... more The smart grid promises a myriad of benefits for both the consumer and energy service providers. However, realising its potential is subject to solving a number of complex issues. One of the major directions of smart grid research is demand response modelling that aimed at reducing the peak demand and billing by introducing appropriate real time pricing. The main difficulty is in managing the optimum pricing on a real time basis. In this paper, we will provide a state of the art review of an existing approach that models demand response in real time and also the underlying model that is tested with real data by using a stochastic iterative process with simultaneous perturbation stochastic approximation algorithm. Our model shows that real time price is better than a flat rate price. We will provide a brief outlook to the future where we propose a model that takes complex customers' behaviour into consideration. The proposed model includes a real time Price Suggestion Unit (PSU) that assists users to further reduce their electricity price while reducing the aggregate load for the energy providers.