Fully CMOS Memristor Based Chaotic Circuit

This paper demonstrates the design of a fully CMOS chaotic circuit consisting of only DDCC based memristor and inductance simulator. Our design is composed of these active blocks using CMOS 0.18 µm process technology with symmetric ±1.25 V supply voltages. A new single DDCC+ based topology is used as the inductance simulator. Simulation results verify that the design proposed satisfies both memristor properties and the chaotic behavior of the circuit. Simulations performed illustrate the success of the proposed design for the realization of CMOS based chaotic applications

A Lighting Coordinate Database for 3D Art Objects

Cataloged from PDF version of article.Artists making three-dimensional art objects have an idea in their minds about how to illuminate their creations. For museums and galleries to illuminate these objects successfully according to the ideas of the artist, the types of light sources and their locations must be known. To fulfil this requirement, we propose a lighting coordinate database (LCD) to establish the coordinates of light sources. We describe two possible methods of obtaining data for this database: a computer software method and a hardware method. The head of Michelangelo's David is used to test the applicability of the two methods. In the software method, the scanned image of David's head is illuminated on the computer screen and data for the location of light sources are created. In the hardware method, a second set of data is created by illuminating a scale model of David using light emitting diodes (LED)

Impact of Lighting Arrangements and Illuminances on Different Impressions of a Room

Cataloged from PDF version of article.This study explores whether different lighting arrangements (general lighting, wall washing and cove lighting) and different illuminances (500 and 320 lux) could affect the perception of the same space. An experimental study was conducted to investigate how the qualitative aspects of space (the impressions of a space) could be enhanced with lighting. Hundred participants were first asked to choose the most suitable lighting arrangement for each impression (clarity, spaciousness, relaxation, privacy, pleasantness and order) under the 500 lux illuminance. In the second stage, they were asked to compare the two illuminances (500 and 320 lux) for the lighting arrangement they selected in the first stage. There was a statistically significant relation between impressions and lighting arrangements, also between impressions and lighting levels. Thus, different lighting arrangements and lighting levels could be used to enhance the clarity, spaciousness, relaxation, privacy, pleasantness and order of a room. The results of this study found most suitable lighting arrangements with their illuminances for each impression, which is reported in the paper

Effects of different lighting arrangements on space perception

The idea to improve the quality of lighting design in interior spaces has gained importance in the last years. This experimental study concentrateson the quality of lighting and the relation between lighting arrangements and perception. A room having four different lighting arrangements was prepared and the differences between the perception of the participants under each lighting arrangement was analysed. The results suggested that different lighting arrangements affect perception. Wall washing enhanced the impressions of clarity and order, cove lighting enhanced spaciousness and order and uplighting made the same space relaxing, private and pleasant

Cell-graph mining for breast tissue modeling and classification

We consider the problem of automated cancer diagnosis in the context of breast tissues. We present graph theoretical techniques that identify and compute quantitative metrics for tissue characterization and classification. We segment digital images of histopatological tissue samples using k-means algorithm. For each segmented image we generate different cell-graphs using positional coordinates of cells and surrounding matrix components. These cell-graphs have 500-2000 cells(nodes) with 1000-10000 links depending on the tissue and the type of cell-graph being used. We calculate a set of global metrics from cell-graphs and use them as the feature set for learning. We compare our technique, hierarchical cell graphs, with other techniques based on intensity values of images, Delaunay triangulation of the cells, the previous technique we proposed for brain tissue images and with the hybrid approach that we introduce in this paper. Among the compared techniques, hierarchical-graph approach gives 81.8% accuracy whereas we obtain 61.0%, 54.1% and 75.9% accuracy with intensity-based features, Delaunay triangulation and our previous technique, respectively. © 2007 IEEE

Effects of hue, saturation, and brightness on preference

A study was done to investigate preference responses for foreground-background color relationships. To do this, 123 university undergraduates in Ankara, Turkey, were asked to view eight background colors selected from HSB color space on which color squares of differing hues, saturations, and brightnesses were presented. Subjects were asked to show the color square they preferred on the presented background color. Findings showed that colors having maximum saturation and brightness were most preferred. Blue was the most preferred hue regardless of background. The findings for preferences for foreground-background color relationships are also included in this article. © 2002 Wiley Periodicals. Inc. Col. Res. Appl

Effects of different lighting types on visual performance

This study investigates whether different lighting types have an effect on the visual performance of office workers. Wall washing, cove lighting and uplighting were tested as they are the most widely used lighting types in offices, after general lighting. The lighting level chosen was 275 lx. The experiments were conducted in a controlled environment with different lighting types. Ninety participants took part in three groups of thirty. The performance measurements for each group were done in different lighting sequences. The data collected were statistically analysed. The effects of age, gender and eye deficiency of the participants on performance were also investigated

Effects of Hue, Saturation, and Brightness: Part 2 - Attention

This is the second part of an experiment by Camgöz, Yener and Güvenç, which investigates attention responses for foreground-background colour relationships. One hundred and twenty three university undergraduates in Ankara, Turkey, viewed eight background colours selected from HSB colour space, on which colour squares of differing hues, saturations, and brightness's were presented. Participants were asked to show the colour square attracting the most attention on the presented background colour. Findings showed that on any background colour, colours of maximum saturation and brightness attract the most attention (67%). The yellow-green, green, and cyan range attracts the most attention (45%), followed by the red and magenta range (30%). Foreground-background colour relationships in terms of attention are also included in the findings of the study. © 2003 Wiley Periodicals, Inc

Colour naming

An experimental study exploring colour ranges corresponding to different colour names has been conducted. Available colour terms in Turkish language have been identified and the most frequently known or used colour terms have been attained. Using the Munsell Color System, colour ranges reflecting the colour naming and colour perception of Turkish people, have been constructed for each colour term. The discussion of the findings and observations during the research are also included. © 2005 Elsevier Ltd. All rights reserved