In a tall building with multiple elevators, it is a notoriously di cult task to control the elevators in the most e cient manner [1].The system proposed in this paper contains two key ideas. First, it continuously generates dispatch functions by adaptation to changes in passenger tra c. Second, it tries to reduce passengers' waiting time by multiple elevator allocation when it is expected that ...

This article examines the possibility of measuring lift maintenance through analysis of used hydraulic oil. Hydraulic oils have proved to be a reliable indicator for the maintenance performed on elevators. It has also been proved that the end users or the maintenance personnel do not always conform to the instructions of the elevators’ hydraulic machine manufacturer. Furthermore, by examining t...

The unique superiority of transformation optics devices designed from coordinate transformation is their capability of recovering both ray trajectory and optical path length in light manipulation. However, very few experiments have been done so far to verify this dual-recovery property from viewpoints of both ray trajectory and optical path length simultaneously. The experimental difficulties a...

Contaminant transport and flow distribution are very important during an elevator ride, as the reduced social distancing may increase infection rate of airborne diseases such COVID-19. This investigation used a computational fluid dynamics (CFD) model based on RNG k–ϵ turbulence to predict airflow particle in elevator-lobby area with moving passengers. The CFD results showed complex pattern due...

PURPOSE The purpose of this study is to systematically review and analyze disasters involving South Korean hospitals from 1990 and to introduce a newly developed implement to manage patients' evacuation. MATERIALS AND METHODS We searched for studies reporting disaster preparedness and hospital injuries in South Korean hospitals from 1990 to 2008, by using the Korean Studies Information Servic...

The word “serendipity” is considered very difficult to define; it may be considered “A talent for making fortunate discoveries while searching for other things”. The history of sexual medicine teaches us the importance of serendipity along with research. Serendipity in the year 1988 was initiated by a slow elevator. Dr. Jacob Rajfer, Professor of Urology, had attended a meeting on the 2 floor o...

Multi-car elevator (MCE for short) systems have been receiving increasing attention these days. An MCE has two or more cars in one shaft. It is difficult to control MCEs by using algorithms developed for single-car elevator systems, because MCEs need to avoid collision of the cars of the same shaft. In this paper, we propose an algorithm to control MCE systems, and show the effectiveness of our...

In this work we study the problem of rope sway dynamics control for elevator systems. We choose to actuate the system with a semi-active damper mounted on the top of the elevator car. We propose nonlinear controllers based on Lyapunov theory, to actuate the semi-active damper and stabilize the rope sway dynamics. We study the stability of the proposed controllers, and test their performances on...

PURPOSE To report a unique surgical approach for congenital double elevator palsy with sensory exotropia. CASE REPORT A 7-year-old boy with congenital double elevator palsy and sensory exotropia was managed surgically by Callahan's procedure with recession and resection of the horizontal recti for exotropia without inferior rectus recession, followed by frontalis sling surgery for congenital ...

This paper presents an optimal control strategy for elevator group in large buildings. An elevator group controller allocates different elevators to up and down hall calls that coming from different floors. The control strategy is a precondition to minimize mainly the average waiting time of hall calls. In this paper, two genetic algorithms are developed to treat efficiently the elevator group ...