Contributions of roll and pitch to sea sickness

The purpose of the present study was to test the traditional assumption that sea sickness is uniquely provoked by heave motion characteristics, pitch and roll movements being ineffective. In an experi-ment with a ship motion simulator subjects were exposed to pitch, and roll motions in combination with rather weak heave motions that have no...

Factors influencing drivers' speed behaviour and adaptation: Summary report on research area 2

This report summarises the findings of Research Area 2 within the European project MASTER (MAnaging Speeds of Traffic on European Roads) and addresses the question "what are the key factors influencing drivers' choice of speed?" It deals with present speeds and speed management methods, speed enforcement, motivation and acceptability of driving...

Non-starch polysaccharides in pig feeding

In pigs and humans, the nutrients starch, protein, fat and some minerals need to be digested prior to the terminal ileum for optimal use of these nutrients. In contrast, the non-starch polysaccharides (NSP) are mainly fermented by microbes in the hindgut. Results of experiments in pigs showed that NSP negatively affected apparent digestion of...

Identification and adaptive control scheme using fuzzy parameterized linear filters

A nonlinear fuzzy control structure enhanced with supervised learning and/or adaption is presented. Availability of at least a partial process model is assumed. Nonlinear process identification procedure is used to complete the partial model. Based on the identification model the system sensitivity model is derived which guides the training...

Modeling driver behaviour with different degrees of automation: a hierarchical decision framework of interacting mental models

Quality of life in elderly subjects with pain in the hip or knee

This study examines the quality of life (QOL) of community living elderly people aged 55-74 with chronic, episodic or sporadic pain in the hip or knee and of a reference group without pain (total n = 306). Firstly, it was hypothesized that the experienced QOL is lower in people with more chronic pain. Secondly, the potential mediating and...

Fuzzy modelling and control using parameterized linear filters

The paper presents a nonlinear identification scheme, which consists of a linear dynamical section (filter) and a nonlinear zero-memory section (implemented by a fuzzy mapping). Only the filter section is on the primary signal path. The nonlinear mapping (depending on the system input and state) delivers the filter parameters. The identification...

Physical and psychosocial disability in elderly subjects in relation to pain in the hip and/or knee

Objective. To determine physical and psychosocial disability in subjects aged 55 to 74 years living in the community, in relation to pain in the hip and/or knee, and to explore the relationships between pain, physical and psychosocial disability, and selected background variables. Methods. A subsample from a community based study on pain,...

Ocular torsion before and after 1 hour centrifugation

To assess a possible otolith contribution to effects observed following prolonged expo-sure to hyper gravity, we used video-oculography to measure ocular torsion during static and dynamic conditions of lateral body tilt (roll) before and after one hour of centrifugation with a Gx-load of 3G. Static tilt (from 0 to 57 deg. to either side) showed...

Veilig over wegen: Snelheidsbeperkende maatregelen op 80-km wegen in Drenthe

Efficient adaptive fuzzy control scheme

The paper presents an adaptive nonlinear (state-) feedback control structure, where the nonlinearities are implemented as smooth fuzzy mappings defined as rule sets. The fine tuning and adaption of the controller is realized by an indirect adaptive scheme, which modifies the parameters of the fuzzy mapping. The performance index gradients are...

Vocational rehabilitation of young adults with a disability of one arm or hand

The paper presents a summary of a study of the vocational rehabilitation of young adults with a disability of one hand or arm. It demonstrates the importance of labor research in vocational rehabilitation. The success of vocational rehabilitation depends in large measure on the suitability of the job chosen and the adaptability of the workplace....

A unified control strategy for the active reduction of sound and vibration

The generalized minimum variance (GMV) control strategy is proposed as an effective strategy for active sound and vibration control systems. The GMV strategy is shown to unify well-known adaptive filtering approaches based on LMS-type algorithms and purely feedback strategies as used in other types of control systems. The shortcomings of the LMS...

Cytotoxic and adaptive effects in rat nasal epithelium after 3-day and 13-week exposure to low concentrations of formaldehyde vapour

To study in detail possible effects of low concentrations of formaldehyde on the nasal epithelium, Wistar rats were exposed to 0, 0.3, 1 and 3 ppm formaldehyde vapour for 6 h/day, 5 days/week during 3 days or 13 weeks, using in vivo [3H]thymidine labeling for cell proliferation studies, and light and electron microscopy for detecting...

Origin of the electroretinogram in the intact macaque eye. I. Principal component analysis

Responses to 400 msec flashes of white light were recorded at various depth in the retina of the intact macaque eye. A statistical technique, principal component analysis (PCA), was used to isolate independent components from the LERG, using the changing contribution of a cell's response to the LERG with retinal depth. Two approaches were...

Quantum coincidence requirements during dark-adaptation

Subjective brightness during dark-adaptation

The course of dark-adaptation was studied with threshold measurements and with measures of the luminance required to maintain a constant supraliminal brightness. A stimulus in the light-adapted right eye was matched in brightness to a stimulus presented to the left eye, which was dark-adapted. Two different methods were used and several levels...