Among victims of occupational accidents in South Korea for the past seven recent years (2008)(2009)(2010)(2011)(2012)(2013)(2014), victims of accidents in the construction industry accounted for 27.35% and deaths among them accounted for 43.75%, representing the largest proportion of victims. Deaths by crashing accounted for the largest proportion of deaths, and the most frequently injured part of the body was the head. This study proposed and developed a smart helmet, which is an industrial safety helmet with a detachable smart module that uses a variety of sensors to collect workers' working status and, situations relating to safety for workers' safety in industrial sites. The proposed safety helmet is entitled to protective gear safety certification in South Korea, and the replacement cycle for the safety helmet is approximately three months, while there is no expiration term for the wireless module within the helmet. The use of the proposed safety helmet would allow the injured to receive emergency aid within the golden time when an accident takes place. Moreover, the helmet minimizes the loss of life on a national level, the production costs and the production time with the helmet may be reduced within the conventional industrial settings, and the development of the helmet itself may contribute to the advancement of smart technology.
In this paper, we propose a walk status method which can be fused with conventional walk intention method to improve convenience of an electric assistive walking system for elder people with restricted walking capabilities. The system uses a handlebar as a trigger and regards grabbing a handlebar as expressing will to walk. And the system uses a user's linear velocity and angular velocity as linear velocity and angular velocity of a system, checked by laser range finder. To achieve this, we propose a method to find a virtual central point of a human body by estimating a central point between two legs. The experiments are carried out by comparing user's linear velocity and angular velocity, and system's linear velocity and angular velocity. The results show that the error of linear velocity and angular velocity between a user and a system are 1% and 2.77%, which means the linear velocity and angular velocity of a user can be applied to a system. And it is confirmed that the proposed fusion method can prevent a user from being dragged by an assistive walking system or a malfunction caused by lack of experience
An alt-azimuth type mount system, developed at the Space Science and Technology Laboratory, Kyung Hee University, has been found to experience some difficulties in monitoring of the artificial space objects. Since the telescope installed on the alt-azimuth mount does not rotate on the same axis as the earth does, this mount system needs an instrument rotator to correct the field rotation. Although there are some commercial instrument rotators already in the market, those are not suitable for our system due to their low interchangeability. In this study, we have designed a new high speed instrument rotator and calculated the deformation of new designed system using structural analyses.Keywords: instrument design, man-made space objects, man-made space objects observing, structural analysis
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