Study on Method to Generate Wood Grain Pattern Representing Required Impression

2013 ◽  
Author(s):  
Ryo Akiyama ◽  
Takuya Mori ◽  
Hideki Aoyama ◽  
Tetsuo Oya
Keyword(s):  
Computer Graphics ◽  
Tree Growth ◽  
Wood Surface ◽  
Environmental Conditions ◽  
Basic System ◽  
New Approach ◽  
Customer Needs ◽  
Conventional Methods ◽  
Wood Grain

Various approaches for generating wood grain patterns using computer graphics have been proposed so far. However, with such conventional methods, it is difficult to reproduce real wood grain patterns, as well as design wood grain patterns with impressions that reflect customer needs. This paper proposes a new approach for generating wood grain patterns. For instance, it can generate virtual trees by simulating tree growth taking into consideration environmental conditions, model fine tree tissues and reflection properties at the wood surface, etc. By applying these modeled factors, more diverse and accurate wood grain patterns can be generated. The authors also propose a method of controlling the grain patterns generated based on Kansei to realize grain patterns that meet customer needs. By building the basic system of the proposed method, various grain patterns could be generated, and grain pattern impressions controlled.

Development of System for High Quality Wood Grain Design

2011 ◽  
Author(s):  
Takuya Mori ◽  
Satoshi Shibasaki ◽  
Hideki Aoyama
Keyword(s):  
Computer Graphics ◽  
Tree Growth ◽  
Wood Surface ◽  
Environmental Conditions ◽  
Tree Species ◽  
Growth Conditions ◽  
High Quality ◽  
New Approach ◽  
Conventional Methods ◽  
Wood Grain

Various approaches for generating woodgrain patterns using computer graphics have been proposed so far. However, it is difficult to reproduce real woodgrain patterns using such conventional methods. In this paper, a new approach for generating woodgrain patterns is proposed. Virtual trees are generated by simulating tree growth in consideration of environmental conditions. Moreover, fine tree tissues and reflection properties at the wood surface are modeled. By applying these modeled factors, more diverse and accurate woodgrain patterns can be generated. With this approach, various types of virtual trees can be obtained by changing growth conditions such as period and location of growth or form of tissue in trees without the need to reset complicated parameters of each tree species. After this, the virtual trees can be cut at arbitrary areas, thus allowing a variety of woodgrain patterns to be generated by easy parameter setup.

scholarly journals Direct and indirect effects of environmental limitations on white spruce xylem anatomy at treeline

2021 ◽  
Author(s):  
Timo Pampuch ◽  
Mario Trouillier ◽  
Alba Anadon-Rosell ◽  
Jelena Lange ◽  
Martin Wilmking
Keyword(s):  
Tree Growth ◽  
Environmental Conditions ◽  
Indirect Effects ◽  
Tree Height ◽  
White Spruce ◽  
Vegetation Period ◽  
Lumen Diameter ◽  
Xylem Anatomy ◽  
Direct And Indirect Effects ◽  
Mixed Effect

<p>Treeline ecosystems are of great scientific interest to study the direct and indirect influence of limiting environmental conditions on tree growth. However, tree growth is complex and multidimensional, and its responses to the environment depend on a large number of abiotic and biotic factors and their interactions.</p><p>In this study, we analyze the growth and xylem anatomy of white spruce trees (<em>Picea glauca</em> [Moench] Voss) from three treelines in Alaska (one warm and drought-limited, and two cold and temperature-limited treelines). We hypothesized (1) no difference between the treelines regarding the relationship between tree DBH and height, yet in general (2) faster growing trees at the warmer site. Additionally, we expected to find differences in xylem anatomical traits with trees from the drought-limited site having adapted to drought conditions by (3) forming smaller lumen diameter due to water deficit but (4) a higher xylem anatomical density due to higher temperatures and a longer vegetation period.</p><p>Regarding growth in height and diameter, trees at the drought-limited treeline grew relatively (1) taller and (2) faster compared to trees at the temperature-limited treelines. Raw xylem anatomical measurements showed (3) smaller lumen diameters and (4) higher density in trees at the drought-limited treeline. However, using linear mixed-effect models, we found that (i) traits related to water transport like lumen diameter were not significantly correlated with the actual amount of precipitation during the vegetation period but with tree height. We also found that (ii) traits related to mechanical support like density were mainly positively influenced by the mean temperature during the vegetation period.</p><p>The differences in lumen diameter found in the raw data can be explained by differences in the growth rates of the trees, since lumen diameter at the lower part of the tree stem needs to increase over time with increasing tree height. The greater wood density at the drought-limited treeline is probably caused by the higher temperature that leads to more biomass production, and potentially longer vegetation periods.</p><p>Our study shows that xylem anatomical traits in white spruce can be directly and indirectly controlled by environmental conditions. While lumen diameter is not directly influenced by environmental conditions but indirectly through tree height, other traits like anatomical density show a direct correlation with environmental conditions. Our results highlight the importance of approaching tree growth in a multidimensional way and considering direct and indirect effects of environmental forcing.</p>

scholarly journals Spatial distribution of spruce trees in the nature reserve 'Jankove bare' on mt. Kopaonik

2009 ◽  
pp. 191-204
Author(s):  
Branko Stajic ◽  
Milivoj Vuckovic ◽  
Marko Smiljanic
Keyword(s):  
Spatial Distribution ◽  
Tree Growth ◽  
Environmental Conditions ◽  
National Park ◽  
Nature Reserve ◽  
Distance Methods ◽  
Study Results

The methodology and applicability of the study of spatial distribution of trees in Serbian forestry have been insufficiently reported and presented. This paper, based on mathematical?statistical principles, analyses the method of spatial distribution of spruce trees in the Nature Reserve 'Jankove Bare' in the National Park 'Kopaonik'. The following methods in the group of distance methods were applied: Kotar's method (1993), T2?method, and the index of distance dispersion (Johnson, Zimmer, 1985). The study results in a pure uneven-aged spruce stand based on all three methods showed that spruce trees are randomly distributed over the stand area. Therefore, environmental conditions in the study stand can be regarded as homogeneous and equally suitable for tree growth, and there are no significant interactions between the trees, which could cause a higher competition between the trees for nutrients, water, etc.

scholarly journals Effect of Alumina and Halloysite clay on Electrical tree growth in Silicone Rubber Nanocomposite

2018 ◽  
Vol 2 (3) ◽  
pp. 20-25
Author(s):  
Keyword(s):  
Tree Growth ◽  
Silicone Rubber ◽  
Strength Properties ◽  
Growth Speed ◽  
New Approach ◽  
Undoped Material ◽  
Electrical Tree ◽  
Nano Alumina ◽  
Tree Growth Rate ◽  
Insulation Breakdown

Nowadays Silicone Rubber (SiR) is recommended in high voltage cable accessories fabrication as it offers excellent electrical and mechanical properties. Electrical tree is one of the phenomenon which contributes to the main factor of SiR insulation breakdown. Recently, a new approach has been applied in order to enhance the insulation strength properties by introducing nano filler in undoped material. Thus, this paper presents the influence of nano-alumina and halloysite nanoclay on electrical tree growth in SiR at 0, 1 vol%, 2 vol% and 3 vol% concentration. The electrical tree growth was investigated at 8kVrms after tree inception voltage (TIV) within 30 minutes under room temperature. The results show reductions of electrical tree growth speed and accumulate damage (%) up to 2 vol% nano-alumina and up to 3 vol% halloysite nanoclay. Nevertheless the presence of 3 vol% nano-alumina in SiR leads to the faster electrical tree growth rate and the worst accumulate damage within 1 minute of electrical tree growth process.

A NOVEL PARTICLE FILTER BASED SLAM

2013 ◽  
Vol 10 (03) ◽  
pp. 1350018 ◽  
Author(s):  
R. HAVANGI ◽  
M. TESHNEHLAB ◽  
M. A. NEKOUI ◽  
H. D. TAGHIRAD
Keyword(s):  
Particle Filter ◽  
Soft Computing ◽  
New Approach ◽  
Soft Computing Techniques ◽  
Conventional Methods

In this paper, a new approach to SLAM is proposed that is based on particle filter and soft computing techniques. In this approach, the robot pose is estimated based on unscented marginal particle filter (UMPF) and the static map is considered as parameters that are updated using soft computing. Significant improvement in the proposed method is observed in terms of accuracy of estimation and consistency compared to conventional methods. A number of simulations and experiments are presented to evaluate the algorithm's performance compared to conventional approaches.

SIMULATED CROSSBREEDING: A CASE OF HYBRIDIZED FRACTALS

Fractals ◽  
1994 ◽  
Vol 02 (04) ◽  
pp. 485-491
Author(s):  
MEI CHEN CHUA ◽  
WEN JING HSU
Keyword(s):  
Computer Graphics ◽  
New Approach ◽  
Preliminary Results ◽  
Lindenmayer System ◽  
Plant Forms

The Lindenmayer-system formalism is extended to model the hybridization of plant forms. Several algorithms are developed and tested. Pictures illustrating these algorithms are generated by using computer graphics. The preliminary results suggest that the proposed new approach may be useful for combining fractals that are generated iteratively.

scholarly journals RUNNERING RESPONSE OF DIVERSE STRAWBERRY GENOTYPES

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 657d-657
Author(s):  
Carolyn L. Paynter ◽  
Barbara M. Reed
Keyword(s):  
Ambient Temperature ◽  
Environmental Conditions ◽  
Growth Chamber ◽  
Separate Experiment ◽  
Plant Germplasm ◽  
Conventional Methods

The National Plant Germplasm Repository, Corvallis, houses over 700 different Fragaria genotypes. Many of these produce few or no runners, making propagation difficult by in vitro or conventional methods. Experiments were run to determine the response of non-runnering genotypes to environmental conditions and GA3 treatments. Two groups of plants of 12 genotypes were grown in a 25°C growth chamber (GC) with 24 h light. One group was sprayed twice with 500 ppm GA3, 24 h apart, while a second group was not sprayed. Control plants of each genotype were grown at ambient temperature and long days and were not sprayed with GA3. Both F. vesca L. cultivars and day-neutral genotypes produced significantly more runners with the GA3 GC treatment than the unsprayed GC or the control. Most June-bearing cultivars had improved runnering with both GC treatments. A separate experiment using 30 genotypes with two GA3 sprays (500 ppm, 24 h apart) at ambient temperature and long daylength showed that plants with the GA3 sprays produced significantly more runners than unsprayed controls. In both experiments, GA3 sprays improved runner production by most of the unresponsive Fragaria genotypes.

scholarly journals The effect of logistic controlling on business processes

2014 ◽  
Vol 8 (2-3) ◽  
pp. 107-111
Author(s):  
Szilvia Méhesné Berek
Keyword(s):  
Environmental Conditions ◽  
Business Processes ◽  
Precise Information ◽  
Customer Needs ◽  
Positive Effects ◽  
Managerial Decisions ◽  
Controlling System ◽  
Cost Sensitivity

The increase in the significance of logistics can be attributed to two major reasons: the increasing cost sensitivity of companies and the necessity for the higher fulfilment of customer needs. Logistic controlling is a tool of management used to coordinate logistic activities and to reach logistic managerial decisions by providing information through the analysis of the system. The up-to-date and precise information that can be gained from the logistic controlling system helps the management in the preparation of decisions, and the adaptation to environmental conditions. With these activities, logistic controlling makes the enterprises more efficient and successful. Taking the above into consideration, I carried out a survey on why commercial entities decided on the introduction and application of a logistic controlling system, what conditions are necessary for the introduction of a logistic controlling system, and what experiences the users gained by the application. Positive effects of logistic controlling were proved on operations, and the introduction and application of logistic controlling were analysed.

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