PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 15684549

Proposal for a framework for optimizing artificial environments based on physiological feedback.

Hideyuki Takagi·Shangfei Wang·Shota Nakano
View original source ↗Export metadata ↓

Abstract

We propose and then evaluate a new framework for finding the physical parameters of an artificial environment which give rise to given target physiological characteristics. We assume that a human is a system that takes as inputs the physical parameters of an artificial environment and outputs physiological parameters in response. We define our task as the inverse problem; we must find the best inputs from given target outputs. Our proposed framework solves the inverse problem using evolutionary computation techniques to optimize an artificial environment. We evaluate this framework using a simulation with a vibration environment and verify that it works.

Explore related subjects

Environment, ControlledFeedbackHumansModels, NeurologicalNeuronsJournal ArticleResearch Support, Non-U.S. Gov't

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Hideyuki Takagi, Shangfei Wang, Shota Nakano. 2005. Proposal for a framework for optimizing artificial environments based on physiological feedback.. https://doi.org/10.2114/jpa.24.77

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2005

Spectral quality and UV-B stress stimulate glycyrrhizin concentration of Glycyrrhiza uralensis in hydroponic and pot system.

Glycyrrhizin, the major bioactive component of Glycyrrhiza uralensis, is widely used as a natural sweetener. Recently glycyrrhizin has been shown to have anti-tumor activity, highly active in inhibiting replication of HIV-1 and SARS-associated virus and exhibits a number of pharmacological effects. The principle objective of the current study was to evaluate the effects of different spectral quality including red, blue, white and UV-B radiation on the production of glycyrrhizin, in a controlled environment. Plants were grown under artificial lights with elevated CO(2) concentration and both the pot and hydroponic plants were assigned to red and blue light treatments and those grown under white fluorescent lamps were used as control. In a separate experiment, pot plants were exposed to ultraviolet (UV)-B radiation (wavelength: 280-315 nm). The net photosynthetic rates (NPR) of the leaves reduced significantly immediately after exposure to the high intensity UV-B radiation (3 days at 1.13 W m(-2)). In case of the low intensity UV-B radiation (15 days at 0.43 W m(-2)), NPR was also reduced, but the rate of reduction was significantly slower than that of the high intensity treatment. The concentrations of glycyrrhizin quantified in the root tissues were highest in the plants grown under red light in both hydroponic and pot systems and the concentration increased linearly from 1- to 3-month-old pot plants. Both the low and high intensity of UV-B exposure increased the concentration of glycyrrhizin in the root tissues of 3-month-old pot plants, the values being nearly X1.5 those of the control. The results also indicate that the glycyrrhizin concentrations of 3-6 months old pot plants were similar or even higher than the previously reported values for 3-4 years old field-grown plants and confirm that high concentration of glycyrrhizin production is possible within a very short production period under controlled environments.

Environment, Controlled↗
PubMed2005

Management of young children with Rett disorder in the controlled multi-sensory (Snoezelen) environment.

Rett syndrome is a neurological disorder resulting from an X-linked dominant mutation. It is characterized by a variety of physical and perceptual disabilities, resulting in a need for constant therapy programs to be administered on a regular basis throughout the client's life. As the child with Rett disorder (RD) is entering the more obvious, hectic phase of this syndrome (stage II), signs of extreme agitation and discomfort are usually exhibited. This behavior is suspected to reflect damaging chaotic processes accruing in the brain at that time. Experts advise that calming techniques might be helpful for children with Rett during this period. This may be our earliest opportunity to change the course of the disorder. Now that our knowledge of RD has increased and children are being diagnosed at a substantially earlier age, new intervention methods should be introduced for parents and therapists. This may ensure more suitable treatment. The multi-sensory environment may provide a soothing haven, which appeals to the child with RD. This article provides a short review of RD typical phenotype and suggests suitable activities that could take place in the multi-sensory environment with this population at the early stages of appearance of the Rett disorder.

Environment, Controlled↗