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Systems Approach to Project Management
Published in Adedeji B. Badiru, Project Management, 2019
Establish guidelines for tracking, reporting, and control Define data requirements Data categoriesData characterizationMeasurement scalesDevelop data documentation Data update requirementsData quality controlEstablish data security measures
A Systematic Review of a Virtual Reality System from the Perspective of User Experience
Published in International Journal of Human–Computer Interaction, 2020
Yong Min Kim, Ilsun Rhiu, Myung Hwan Yun
The input device is divided into non-hand and hand input devices depending on whether hands are required. For a non-hand input device, whether tracking technology is applied is added as a detailed criterion. If tracking system is available, body tracking, head tracking, eye tracking, microphone, and treadmill are included. In the absence of tracking, non-tracked and non-hand devices are added, which can include pedal-type inputs. In case of whole-body tracking, the entire body of the user is tracked and the user’s movement pattern is recognized. Head tracking is generally available when the user wears an HMD such as Oculus Rift, HTC Vive, or Sony PlayStation VR. Eyeglasses with a tracking sensor can also track head movements. Under this condition, a VR environment corresponding to the head movement of the user is presented. Eye tracking tracks the user’s eye movement such as the gaze point. A microphone can be used for system command by tracking the user’s voice information. When a treadmill is used as an input device, the user can actually walk on the treadmill and the gait motion is transmitted to the VR engine, which changes the virtual world according to the user’s motion. It includes not only traditional treadmill, but omnidirectional treadmill such as Omni-treadmill and VirtuSphere.
Stability analysis of nonlinear multi-agent relay tracking systems over a finite time interval
Published in International Journal of Control, 2020
Lijing Dong, Deyin Yu, Hao Yan
Most results focus on solving various problems in terms of basic multi-agent systems where the tracking agents are fixed and no replacement is considered. There is a more realistic application scenario, where the agents are deployed in a certain area in charge of monitoring and pursuing any intruded targets. Inspired by the work in Bakolas and Tsiotras (2012), we propose a relay cooperative tracking strategy for a class of multi-agent systems where agents capable of sensing and mobility are deployed in a certain area. This area is partitioned into a number of subareas (called as Voronoi cells) with knowledge of Voronoi diagram. When a target enters this area, a preset number of agents are assigned to track the target. During the tracking process, one of the tracking agents quits and a new agent joins tracking at switching times, which is called relay tracking. The relay algorithm guarantees that the overall tracking error jumps down at each switching time, which accelerates the tracking process and reduces the tracking time interval.
Evaluation of electrical efficiency of photovoltaic thermal solar collector
Published in Engineering Applications of Computational Fluid Mechanics, 2020
Mohammad Hossein Ahmadi, Alireza Baghban, Milad Sadeghzadeh, Mohammad Zamen, Amir Mosavi, Shahaboddin Shamshirband, Ravinder Kumar, Mohammad Mohammadi-Khanaposhtani
Solar collectors categorized into two classifications based on the tracking model: no tracking system installed, fixed collectors, and a tracker system provided for tracking the sunlight during the daylight, tracking collectors. There is no movement for the fixed collectors, while the tracking collectors move in a way where the incoming sun-rays are perpendicular to the surface of the collectors. Flat plate collectors, evacuated tube collectors are classified as the fixed collector. There are two subclasses of single-axis tracking and double axis tracking for tracking of solar collectors. The former classified into three groups of parabolic and cylindrical trough collectors and linear Fresnel collectors. The latter examples are central tower collectors, parabolic dish collectors, and circular Fresnel lenses. All of the mentioned technologies have their specific applications based on the feasibility of the required and available amount of energy demand and also some other climatic considerations (Fuqiang et al., 2017; Hussain et al., 2013; Pandey & Chaurasiya, 2017).