Integration Of Cognitive And Physical Factors To Model Human Performance In Fluid Power Systems

Fluid power technology is constantly evolving as a result of the interaction between the human and the system. Systems such as the hydraulic excavator utilize this technology in order to deliver safe, efficient, and effective performance. However, traditional research has placed much emphasis on technical performance rather than on human components. Imbalances of this nature demonstrate inadequate understanding, lack of knowledge, and limited research on the factors affecting performance. This research aims to address these shortcomings by using an integrated approach to better model human performance in fluid power systems

Time Localization of Abrupt Changes in Cutting Process using Hilbert Huang Transform

Cutting process is extremely dynamical process influenced by different phenomena such as chip formation, dynamical responses and condition of machining system elements. Different phenomena in cutting zone have signatures in different frequency bands in signal acquired during process monitoring. The time localization of signal’s frequency content is very important. An emerging technique for simultaneous analysis of the signal in time and frequency domain that can be used for time localization of frequency is Hilbert Huang Transform (HHT). It is based on empirical mode decomposition (EMD) of the signal into intrinsic mode functions (IMFs) as simple oscillatory modes. IMFs obtained using EMD can be processed using Hilbert Transform and instantaneous frequency of the signal can be computed. This paper gives a methodology for time localization of cutting process stop during intermittent turning. Cutting process stop leads to abrupt changes in acquired signal correlated to certain frequency band. The frequency band related to abrupt changes is localized in time using HHT. The potentials and limitations of HHT application in machining process monitoring are shown

Seventh Annual Workshop on Space Operations Applications and Research (SOAR 1993), volume 1

This document contains papers presented at the Space Operations, Applications and Research Symposium (SOAR) Symposium hosted by NASA/Johnson Space Center (JSC) on August 3-5, 1993, and held at JSC Gilruth Recreation Center. SOAR included NASA and USAF programmatic overview, plenary session, panel discussions, panel sessions, and exhibits. It invited technical papers in support of U.S. Army, U.S. Navy, Department of Energy, NASA, and USAF programs in the following areas: robotics and telepresence, automation and intelligent systems, human factors, life support, and space maintenance and servicing. SOAR was concerned with Government-sponsored research and development relevant to aerospace operations. More than 100 technical papers, 17 exhibits, a plenary session, several panel discussions, and several keynote speeches were included in SOAR '93

An archaeology of group dynamics

Individual people act and make decisions, yet the outcome viewed archaeologically is the aggregate of their myriad choices. This work provides a coherent and illustrated method for interpreting the observed outcome by deriving causal models based upon the dynamics of the individual behaviour in the context of the group. Drawing on multi-disciplinary theoretical and empirical input, an understanding of the expression of sociality and the social patterns which compound to the cultural environment within which people act is presented. From that understanding, the foundation of group dynamics theory is built, providing a model of social structure which defines the interaction between individual influence on cultural behaviour in the aggregate and the influence of cultural heritage on the individual's perceived range of choices. That model can be linked to an archaeological dataset, providing a 'freeze frame' view of social structure over time, at a resolution of chronological periods allowed by current understanding of the data. Given the model of social structure, predictions may be made about the individual's experience, viewpoint and biases as a result of the constraining and permitting effects of the cultural environment, thus broadening the range of what may be 'known' about a particular period. Finally, the 'freeze frame' view is extended by models of the dynamics of individual action and its consequences, providing a method for deriving causal models for change vested in the inter-relationship of individual behaviour and an evolving environment (cultural, natural and manufactured). Thus, group dynamics theory provides the potential for adding to the interpretative value of an archaeological dataset by presenting a wholly new way of understanding the motives and mechanisms for change, as well as explaining stasis. All facets of group dynamics theory are applied to a substantial case study of the first millennium BC in two counties in southern Britain (Hampshire and Sussex), demonstrating utility, practicability and relevance in the current archaeological climate

The Journal of ERW and Mine Action Issue 7.1 (2003)

Research, Development and Technology in Mine Actio

The Second Conference on Lunar Bases and Space Activities of the 21st Century, volume 2

These 92 papers comprise a peer-reviewed selection of presentations by authors from NASA, the Lunar and Planetary Institute (LPI), industry, and academia at the Second Conference on Lunar Bases and Space Activities of the 21st Century. These papers go into more technical depth than did those published from the first NASA-sponsored symposium on the topic, held in 1984. Session topics included the following: (1) design and operation of transportation systems to, in orbit around, and on the Moon; (2) lunar base site selection; (3) design, architecture, construction, and operation of lunar bases and human habitats; (4) lunar-based scientific research and experimentation in astronomy, exobiology, and lunar geology; (5) recovery and use of lunar resources; (6) environmental and human factors of and life support technology for human presence on the Moon; and (7) program management of human exploration of the Moon and space

AIMETA 2005. Atti del XVII Congresso dell'Associazione italiana di meccanica teorica e applicata. Firenze, 11-15 settembre 2005

The volume collects the contributions presented at the XVII national congress of AIMETA. The contributions are grouped according to the various sectors of theoretical and applied mechanics and are offered by a vast scientific community. In addition to the classical sectors, themes of interdisciplinary significance and of considerable interest and highly innovative content were added, for the analysis of which small exchange symposia were proposed. Organised according to 52 sessions (plenary and parallel), the volume contains 290 scientific works that are mainly the result of international cooperation. Therefore, the work represents a significant picture of the current situation and future prospects for mechanics