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2 results on '"Picovici, Dorel"'

1. Advances in voice quality measurement in modern telecommunications

Author

Mahdi, Abdulhussain E. and Picovici, Dorel

Subjects
*QUALITY of service, *TELECOMMUNICATION systems, *ALGORITHMS, *SIGNAL processing, *VOICE analysis, *ELECTRONIC systems
Abstract

Abstract: Quality of service (QoS) is a measure of a communication network performance that reflects the transmission quality and service availability as perceived by the users. In the context of telecommunications, voice communication quality is the most visible and important aspects to QoS, and the ability to monitor and design for this quality should be a top priority. Voice quality refers to the clearness of a speaker''s voice as perceived by a listener. Its measurement offers a means of adding the human end-user''s perspective to traditional ways of performing network management evaluation of voice telephony services. Traditionally, measurement of users'' perception of voice quality has been performed by expensive and time-consuming subjective listening tests. Over the last decade, numerous attempts have been made to supplement subjective tests with objective measurements based on algorithms that can be computerised and automated. This paper examines some of the technicalities associated with voice quality measurement, and presents a review of current subjective and objective voice quality measurement methods and standards as applied to telecommunication systems and devices, with particular focus on recent and internationally standardised methods. [Copyright &y& Elsevier]

Published
2009
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2. Review of battery thermal management systems in electric vehicles.

Author

Hwang, Foo Shen, Confrey, Thomas, Reidy, Colin, Picovici, Dorel, Callaghan, Dean, Culliton, David, and Nolan, Cathal

Subjects
*BATTERY management systems, *PHASE change materials, *LITHIUM-ion batteries, *THERMAL batteries, *ELECTRIC vehicles, *COMMERCIAL vehicles, *HYBRID electric vehicles
Abstract

Lithium-ion batteries are the most commonly used battery type in commercial electric vehicles due to their high energy densities and ability to be repeatedly charged and discharged over many cycles. In order to maximize the efficiency of a li-ion battery pack, a stable temperature range between 15 °C to 35 °C must be maintained. As such, a reliable and robust battery thermal management system is needed to dissipate heat and regulate the li-ion battery pack's temperature. This paper reviews how heat is generated across a li-ion cell as well as the current research work being done on the four main battery thermal management types which include air-cooled, liquid-cooled, phase change material based and thermo-electric based systems. Additionally, the strengths and weaknesses of each battery thermal management type is reviewed in this study. It was determined that air cooled systems are suited for short-distance travel electric vehicles, liquid cooled are for electric vehicles that require long-distance travel, larger battery packs and for high thermal loads, phase change material based are for electric vehicles with constant thermal loads and stable ambient temperatures and thermo-electric battery thermal management systems are best best suited in conjunction with the other types for better control. • Present simplified heat generation model for li-Ion batteries. • Review of upcoming PCM Cooling BMS models. • Analysis of strengths and weaknesses of air, liquid, PCM, and thermoelectric BMS. • Recommendation on appropriate BTMS type for different EV models. • Identified main attributes required for an effective BMS for EV systems. [ABSTRACT FROM AUTHOR]

Published
2024
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