In my opening remarks the acoustics and signal processing involved in active control will be reviewed: both for enhancing audio signals and for attenuating acoustic noise. The physical limits due to the geometry of practical arrays will be discussed, together with the signal processing design methods that can be used to implement robust practical arrays, whose performance approaches these geome...

In this paper a Kalman filter is used to cancel noise and interference contained in two accelerometers embedded in a car under performance tests. Here, the frequency bands of the signals of interest and their noise (deterministic as well as stochastic) are not strongly mixed with each other but it is very difficult to diminish the noise by using the classical approach to filtering. This reason,...

Introduction: Esophagus injuries secondary to caustic ingestion occurs frequently in children. Oral damages cannot give us a clear image of what has happened in upper GI. Therefore endoscopy is only diagnostic way to evaluate upper GI injuries. In this study, we found out the endoscopic results in children admitted with caustic ingestion in Qaem(A. S.) hospital between 2011 to 2013 , and comp...

Based on both subjective and objective data, a study was carried out in order to identify differences in the perception of thermal comfort of office workers in naturally ventilated and air-conditioned buildings. The analysis of the interviews shows that occupants of naturally ventilated office buildings are significantly more satisfied with their thermal environment than occupants in air-condit...

About the Author Max Sherman, Ph.D., is a senior scientist and group leader of the Energy Performance of Buildings Group at Lawrence Berkeley National Laboratory in Berkeley, Calif. He is former chair of Standards Project Committee 62.2P, Ventilation and Acceptable Indoor Air Quality for Low-Rise Residential Buildings. s HVAC&R professionals, our major concern is the engineering of indoor envir...

This paper discusses the numerical study of the effectiveness of atrium smoke exhaust systems. This study is part of a project initiated by ASHRAE and the National Research Council of Canada (NRCC), in which both physical and numerical techniques were employed to determine the effectiveness of such systems and to develop guidelines for their design. This paper presents numerical predictions obt...

In this paper, we address the challenge of predicting optimal comfort temperatures of individual users of a smart heating system. At present, such systems use simple models of user comfort when deciding on a set point temperature. These models generally fail to adapt to an individual user’s preferences, resulting in poor estimates of a user’s preferred temperature. To address this issue, we pro...