• Title, Summary, Keyword: Light Stimuli

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Green Light-emitting Diodes Light Stimuli during Incubation Enhances Posthatch Growth without Disrupting Normal Eye Development of Broiler Embryos and Hatchlings

  • Zhang, L.;Zhu, X.D.;Wang, X.F.;Li, J.L.;Gao, F.;Zhou, G.H.
    • Asian-Australasian Journal of Animal Sciences
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    • v.29 no.11
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    • pp.1562-1568
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    • 2016
  • Monochromatic green light-emitting diodes (LED) light stimuli influences the posthatch growth performance of chicks. This study was undertaken with the following objectives: i) to examine whether the green LED light stimuli induces an overheating effect by determining weight loss rate of fertile eggs during incubation period; ii) to look for the development of eyes and other primary organs at different ages of embryos and newly hatched chicks. Arbor Acres fertile broiler eggs (n = 480) were randomly assigned to 3 incubation groups and exposed to continuous white light, green light, or a dark environment (control) from the first day to 19 d of incubation. The light sourced from LED lamps with the intensity of 30 lx at eggshell level. The results showed that either green or white light stimuli during incubation did not significantly affect the weight loss rate of fertile eggs, hatching time, hatchability, chick embryo, or body weight (BW), the weight percentage of heart, liver, and eyes, as well as obvious systematic abnormalities in eye weight, side-to-side, back-to-front, or corneal diameter from 15 d of embryogenesis to 6 d of posthatch (p>0.05). Compared with the dark condition, green light stimuli during incubation tended to increase feed intake (p = 0.080), improved the BW gain of chicks during 0 to 6 day posthatch (p<0.05), and increased the percentage of pectoral muscle to the BW on 3- and 6-day-old chicks. In addition, embryos or chicks in green light had lower weight percentage of yolk retention on 19 d of embryogenesis and 1 d of posthatch in comparison to those in dark or white group (p<0.05). These results suggest that providing 30 lx green LED light stimuli during incubation has no detrimental effect on the development of eyes, heart and liver of embryos and hatchlings, but does have potential benefits in terms of enhancement of the chick growth during the early posthatch stages. In addition, the fertile broiler eggs stimulated with 30 lx green LED light during incubation does not cause an overheating effect.

Behavioral reaction of common squid Todarodes pacificus to different colors of LED Light (LED 색광에 대한 살오징어의 행동반응)

  • An, Young-Il;Jeong, Hak-Geun;Jung, Bong-Man
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.45 no.3
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    • pp.135-143
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    • 2009
  • To study the behavioral reaction of common squid Todarodes pacificus, to different colors of LED light, individual distribution in the dark condition without LED light stimuli, individual distribution when four colors of light stimuli were at the sections of end and middle of water tank and the changes of gathering rates as the elapse of illuminating time were examined. When it was dark, the distribution of the fish in each section of the tank was U-shape regardless of the investigating time intervals, which means that Todarodes pacificus gathered at the both ends of the tank. The individual distribution when light stimuli were at the one end of the tank showed the tendency of gathering at the illuminated section and decreasing at the opposite section. There were 448 of them at the end of the tank when the light was blue, 352 when white, 302 when green and 132 when red. Thus the fish liked blue light the most, followed by white light. The variations of gathering rate at the both ends of tank as illuminating time elapsed showed the tendency of increasing at the light section (A section), however, it showed the tendency of decreasing at the darkest section (F section). The individual distribution showed the tendency of letter $\wedge$ of gathering at the center and decreasing at the both ends mostly when the light stimuli were at the middle section of tank. The gathering rates at the lighting section were 80.4% when red, 76.4% when white, 69.6% when green and 56.7% when blue. The fishes showed the affinity for the red light mostly, followed by the white light source. The red light and blue light showed the opposite when the light stimuli were at the one end of water tank. The variations of gathering rates as the elapse of time at the lighted section showed the tendency of gradual increasing in the four light sources. The color of light source showing the highest gathering rate within 25-30 minutes of light stimuli was the white, followed by the red.

Molecularly engineered switchable photo-responsive membrane in gas separation for environmental protection

  • Rosli, Aishah;Low, Siew Chun
    • Environmental Engineering Research
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    • v.25 no.4
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    • pp.447-461
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    • 2020
  • In recent years, stimuli-responsive materials have garnered interest due to their ability to change properties when exposed to external stimuli, making it useful for various applications including gas separation. Light is a very attractive trigger for responsive materials due to its speedy and non-invasive nature as well as the potential to reduce energy costs significantly. Even though light is deemed as an appealing stimulus for the development of stimuli-responsive materials, this avenue has yet to be extensively researched, as evidenced by the fewer works done on the photo-responsive membranes. Of these, there are even less research done on photo-responsive materials for the purpose of gas separation, thus, we have collected the examples that answer both these criteria in this review. This review covers the utilisation of photo-responsive materials specifically for gas separation purposes. Photo-chromic units, their integration into gas separation systems, mechanism and research that have been done on the topic so far are discussed.

Changest in Electric Potentials of Leaf Surface Induced by Environmental Stimuli (환경자극에 따른 식물의 엽표면 전위포텐셜의 변화)

  • 손기철;류명화;길미정
    • Protected Horticulture and Plant Factory
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    • v.9 no.2
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    • pp.94-100
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    • 2000
  • This study was conducted to investigate the changes of electric potentials of leaf surface induced by environmental stimuli in plant. The values of electric potentials varied with different intervals of light on and off, and light qualities and moreover, their changes were also varied according to the time of a day. Additionally, stimuli such as candle light, wind, or 5$^{\circ}C$ cool water spray also evoked considerable changes in leaf surface electric potentials and their signal patterns varied with species of plants tested. In frequency analysis of electric potentials, the distribution values by FFT were highest in 1-10 Hz frequency zone by the majority of stimuli. These results suggested that changes in leaf surface electric potentials depended upon plant species even though stimulus was the same and vice versa.

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The Effect of Tone-on-Tone Coloration on the Visual Image of Traditional Korean Dress (톤 온 톤 배색이 한복 착용자의 이미지에 미치는 영향)

  • Kang, Kyung-Ja;Lim, Ji-Young
    • The Research Journal of the Costume Culture
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    • v.13 no.5
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    • pp.804-818
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    • 2005
  • The purpose of this study is to investigate the effect of tone-on-tone coloration on the visual images of traditional Korean dress. The materials in the experiment developed for this study were made up of various stimuli and the response scales for each stimulus. The stimuli were 48 color pictures with various combination of colors, in which the tones of jackets and skirts were manipulated by computer drawing. 24 bi-polar adjectives, each of which was graded into seven in its degree, were used to evaluate each image. The subjects were 576 female students in Jinju City. This experiment was based on the $3{\times}4{\times}4$ factorial designs: color (red, yellow and green), jacket tone (vivid, light, dull and dark) and skirt tone (vivid, light, dull and dark). The results of the study can be summarized as follows; Impression factor of the stimuli consisted of the 5 different dimensions - youthfullness and activity, attractiveness, gracefullness, visibility, and tenderness. The colors and the tone of jackets and skirts used in this experiment influenced 5 impression dimension by interaction of two valuables or working independently. Yellow and green with vivid or light tone had an effect on the formation of youth and activity image, and dark-light combination had an effect on the formation of attractiveness image. In case of green color, light tone of a jacket and vivid or dull tone of a skirt affected gracefulness, while yellow has no impact on visibility image regardless of skirt tone. Red and yellow with vivid or light tone were a factor to decide tenderness.

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A Study in the Perception of the Harmony of Coloration in Traditional Korean Dress of Korean and American Students -On the Tone on Tone Coloration- (한복배색의 조화감에 대한 한.미여대생의 지각반응 연구(제2보) -톤 온 톤배색를 중심으로-)

  • 강경자
    • Journal of the Korean Society of Clothing and Textiles
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    • v.26 no.3_4
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    • pp.443-453
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    • 2002
  • The purpose of this research was to compare the evaluation of tone on tone coloration of traditional Korean dress by Korean and American women college students. The respondents were asked to evaluate 48 stimuli of the traditional Korean skirt and jacket with different tone of color. The evaluation of Korean and American students admit of various interpretation, and it can'be said that they were caused by their different cultural bacgrounds. The results of reseach can be summerized as follows. As to the red colors, Korean students evaluated vivid skirt and light or dark jacket, light skirt and vivid or dull, dark jacket, dull skirt and light jacket as harmonized. But American students judged light skirt and dull and light jacket as not harmonized. As to the yellow colors, both Korean and American students had common opinions that light skirt and dull jacket are well harmonized. Korean students thought vivid skirt and dull jacket, light skirt and dull, dark jacket, dull skirt and dark jacket are well harmonized. American students thought light skirt and vivid, light, dull jacket dull skirt and light jacket are well harmonnized. As to the green colors, Korean students evaluated vivid skirt and dull, dark jacket, light skirt and vivid, dull, dark jacket are well harmonized. But American students evaluated vivid skirt and light jacket, light skirt and dark jacket, dark skirt and vivid or light jacket are not harmonized. Among 48 stimuli of tone on tone coloration, Korean students evaluated 18 set and American students judged 30 set as harmonized.

The Effects of Visual and Auditory Stimulation on the Ability to Perform Exercise (시각과 청각 자극이 운동수행능력에 미치는 영향)

  • Park, Kwang-Hyun;Kim, Yu-Min;Kim, Hyun-A;Seo, Han-Bit;Son, Won-Bin;Song, Eun-Ji;Shin, Su-Jin;Ahn, Ha-Rim;Lee, Choong-Jung;Cho, Min-Ok;Kim, Min-Hee
    • PNF and Movement
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    • v.14 no.2
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    • pp.121-130
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    • 2016
  • Purpose: The purpose of this study was to investigate the effects of visual and auditory stimulation on the ability to perform exercise. Methods: One hundred twenty subjects were randomly divided into four groups (Green light and Fast tempo music, GF; Green light and Slow tempo music, GS; Red light and Fast tempo music, RF; and Red light and Slow tempo music, RS). One of either two visual stimuli or one of two auditory stimuli were applied to each group. The experiment was conducted randomly twice in two environments: one had visual and auditory stimuli and one had no stimulation. Muscle strength, grip, endurance, quickness, agility, concentration, and balance were measured to determine the ability to perform exercise. Results: Significant differences were found in the muscle strength of the participants who were exposed to the auditory factor and the interaction of visual and auditory factors. In endurance, significant differences were found in all of the factors: visual, auditory, and the interaction of visual and auditory. In quickness, agility, and balance ability there were significant differences in the visual factor. In concentration, there was a significant difference in the auditory factor. Conclusion: Visual stimuli, auditory stimuli, and their interaction influenced the ability to perform exercise. These facts imply that providing the proper environmental stimulation is important to increase the ability to perform during exercise.

Review of 4D Printing Materials and their Properties

  • Shin, Dong-Gap;Kim, Tae-Hyeong;Kim, Dae-Eun
    • International Journal of Precision Engineering and Manufacturing-Green Technology
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    • v.4 no.3
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    • pp.349-357
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    • 2017
  • Since its introduction, the 3D printing technology has been widely used in fields such as design, rapid prototyping, and biomedical devices, owing to its advantages of inexpensive, facile embodiment of computer 3D files into physical objects. Later, 4D printing was introduced by adding the temporal dimension to 3D. Stimuli such as heat, humidity, pH, and light trigger the actuation of printed objects without motors or wires. Smart materials that respond to external stimuli are good candidates for 4D printing. In this paper, we review the recent research on 4D printing, and categorize it with respect to the activating stimuli. The mechanical properties of 4D printing materials are mentioned as well. Finally, the future of 4D printing is discussed.

A Study of Visual Field for Industrial Safety (산업 안전을 위한 시각영역에 관한 연구)

  • 윤훈용;심정훈
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.25 no.3
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    • pp.9-15
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    • 2002
  • Due to the inconsiderateness of human capability and inappropriate arrangement of display and control unit at the industrial site, the human error leads to a various accidents. This study was performed to investigate the visual range at the eye field and stationary field at the various angles with three different visual stimuli of alphabetic character, color slip and light-emitting diode. Three kinds of various alphabetic characters depending on length and breadth ratio (1:1, 3:5, 5:3) and three different colors (red, yellow, green) were used for the stimuli. Twenty-five subjects (11 males and 14 females) participated for this study. The results showed that female had wider visual range than male at the eye field, however no significant difference was found at the stationary field. The light-emitting diode had a widest visual range then color slip and characters are in order at the eye field and stationary field. For the character stimulus, the widest visual range was shown at length and breadth ratio of 1:1. The other ratios (3:5 and 5:3) showed no significant difference. The color of red had a widest visual range on the light-emitting diode, however, the color of yellow showed a widest visual range on the just color slip at the eye field. The result of this study would be valuable in applying to the design of visual display and the panel layout of control and displays in the industrial site.

Harmony Perception according to Contrast Coloration of Shirt and Necktie by Male and Female (셔츠와 넥타이의 컨트라스트 배색에 대한 남녀의 조화감 지각)

  • Lim, Ji-Young;Kang, Kyung-Ja
    • The Research Journal of the Costume Culture
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    • v.15 no.5
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    • pp.838-851
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    • 2007
  • The purpose of this research was to investigate the harmony evaluation and the effects used clues on harmony perception in terms of 128 contrast coloration of male shirt and necktie by male and female students. The results are as follows. Among 128 contrast coloration stimuli, female students evaluated 42 set, male students 50 set, so proved that male's range of harmony more extensive than that of female. It is significant difference between female and male on shirt-necktie coloration; vivid red shirt-vivid green tie, dull red shirt-dark blue tie, light red shirt-dull blue tie, dark red shirt-light blue tie, light green shirt-vivid violet tie, light green shirt-light red tie, light green shirt-dull red tie. Especially, in contrast coloration, it was evaluated as harmonized coloration by both male and female as tie was dark tone on the whole.

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