• 한국환경농학회지
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• 제30권4호
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• pp.382-389
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• 2011

BACKGROUND: Light-emitting diodes (LEDs) with lower electric cost and the specific wavelength have been considering as a novel light source for plant production in greenhouse conditions as well as in a closed culture system. Supplementary lighting for day-length extension was considered as light intensity, light quality, and/or photoperiod control on plant growth and development. Effects of supplementary blue or red LED radiation with lower light intensity on growth of Ageratum (Ageratum houstonianum Mill., cv. Blue Field), African marigold (Tagetes erecta L., cv. Orange Boy), and Salvia (Salvia splendens F. Sello ex Ruem & Schult., cv. Red Vista) were discussed during sunrise and sunset twilight in the experiment. METHODS AND RESULTS: Supplementary lighting by blue and red LEDs for 30 (Treatment B30; R30) or 60 (Treatment B60; R60) min. per day were established in greenhouse conditions. Photosynthetic photon flux for supplementary radiation was kept at $15{\mu}mol\;m^{-2}\;s^{-1}$ on the culture bed. Natural condition without supplementary light was considered as a control. The highest shoot and root dry weights were shown in African marigold exposed by red light for 60 min. per day. Supplementary blue and red lighting regardless of the radiation time significantly stimulated development of lateral branches in African marigold. Stem growth in Ageratum and Salvia seedlings was significantly promoted by red radiation as well as natural light. CONCLUSIONS: Extending of the radiation time at sunrise and sunset twilight using LEDs stimulated reproductive growth of flowering plant species. Different characteristics on growth under supplementary blue or red lighting conditions were also observed in the seedlings during supplementary radiation.

• 방송공학회논문지
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• 제15권1호
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• pp.76-88
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• 2010

최근 LED(Light Emitting Diode) 영상표시장치가 방송제작에 사용되고 있으나, 조명과 LED 영상표시장치 간의 상관관계가 정량적으로 분석되지 못해 HD방송의 영상품질 향상을 위해 사용되는 LED 영상표시장치의 효과를 제대로 구현하지 못하고 있다. 따라서 본 논문에서는 조명과 LED 배경화면의 명암비가 피사체에 미치는 명암 및 색채 변화를 실제 방송에서 사용되는 장비들을 이용한 실험을 통해 분석하여, LED 배경화면 명암비와 영상품질의 상관성을 정량적으로 나타냈다. 실험결과 LED 배경화면의 밝기를 6%로 할 경우, 피사체에 20[IRE] 정도의 영향을 미치면서 최적의 영상품질을 구현할 수 있었고, 밝은 LED 배경화면은 영상 명암에 왜곡현상을, 어두운 LED 배경화면은 영상 색에 왜곡현상을 발생시켰다.

• Journal of Biosystems Engineering
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• 제25권3호
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• pp.213-220
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• 2000

Grafting of fruit-bearing vegetables has been widely used to increase the resistance to soil-borne diseases, to increase the tolerance to low temperature or to soil salinity, to increase the plant vigor, and to extend the duration of economic harvest time. After grafting, it is important to control the environment around grafted seedlings for the robust joining of a scion and rootstock. Usually the shading materials and plastic films are used to keep the high relative humidity and low light intensity in greenhouse or tunnel. It is quite difficult to optimally control the environment for healing and acclimation of grafted seedlings under natural light. So the farmers or growers rely on their experience for the production of grafted seedling with high quality. If artificial light is used as a lighting source for graft-taking of grafted seedlings, the light intensity and photoperiod can be easily controlled. The purpose of this study was to develop a prototype system for the graft-taking enhancement of grafted seedlings using artificial lighting and to investigate the effect of air current speed on the distribution of air temperature and relative humidity in a graft-taking enhancement system. A prototype graft-taking system was consisted by polyurethane panels, air-conditioning unit, system controller and lighting unit. Three band fluorescent lamps (FL20SEX-D/18, Kumho Electric, Inc.) were used as a lighting source. Anemometer (Climomaster 6521, KANOMAX), T-type thermocouples and humidity sensors (CHS-UPS, TDK) were used to measure the air current speed, air temperature and relative humidity in a graft-taking system. In this system, air flow acted as a driving force for the diffusion of heat and water vapor. Air current speed, air temperature and relative humidity controlled by a programmable logic controller (UP750, Yokogawa Electric Co) and an inverter (MOSCON-G3, SAMSUNG) had an even distribution. Distribution of air temperature and relative humidity in a graft-taking enhancement system was fairly affected by air current speed. Air current speed higher than 0.1m/s was required to obtain the even distribution of environmental factors in this system. At low air current speed of 0.1m/s, the evapotranspiration rate of grafted seedlings would be suppressed and thus graft-taking would be enhanced. This system could be used to investigate the effects of air temperature, relative humidity, air current speed and light intensity on the evaportranspiration rate of grafted seedlings.

• 환경영향평가
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• 제28권1호
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• pp.63-70
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• 2019

인공조명은 필수적인 부분이지만, 불필요하거나 과도한 빛의 사용으로 인해 빛공해를 유발시킨다. 빛공해는 전력낭비, 인체의 건강상 악영향, 생태계 파괴 등과 같은 부정적인 영향으로 국 내외에서 법적인 규제를 하고 있다. 하지만 현재는 조명기구 설치 이후의 방법으로만 관리하기 때문에 사전에 빛공해가 유발될 우려가 있는 지역을 효과적으로 관리하고 영향을 저감시키기 위한 빛공해분야 영향평가지침을 제안하고자 한다. 영향평가작성지침을 수립하여 작성자 및 검토자의 혼란을 방지하고 중장기적으로 국내의 빛공해 관리를 효과적으로 수립하는데 활용하고자 한다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 춘계학술대회 논문집
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• pp.60-63
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• 2007

Light is a critical element for people to live and do creative activities in residential buildings. Especially, light in dinning room is the most important thing for psychological and emotional effects but people are living under the poor light environment. Most people even isn't well aware of good lighting environment. Also, the domestic lighting designers just follow the Korean Standards illuminance but it isn't appropriate to our cultural and social sides. This study investigates illuminance and color temperature of dining tables, and also analyzed the results of those in actual residential buildings.

• 융합신호처리학회논문지
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• 제14권4호
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• pp.231-234
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• 2013

This paper introduces a mixture of background subtraction technique and K-Means clustering algorithm for removing shadows from video sequences. Lighting conditions cause an issue with segmentation. The proposed method can successfully eradicate artifacts associated with lighting changes such as highlight and reflection, and cast shadows of moving object from segmentation. In this paper, K-Means clustering algorithm is applied to the foreground, which is initially fragmented by background subtraction technique. The estimated shadow region is then superimposed on the background to eliminate the effects that cause redundancy in object detection. Simulation results depict that the proposed approach is capable of removing shadows and reflections from moving objects with an accuracy of more than 95% in every cases considered.

• 조명전기설비학회논문지
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• 제12권2호
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• pp.1-6
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• 1998

INSNA에서 제시하고 있는 환경등급에 따른 광속유지율 산정법에 기초하여, 각 고속도로의 교통량, 주변 지역의 오염 정도에 따라 세분화된 보수율을 산정하는 방법을 제시함으로써 고속도로 조명설계에 있어서 보수율 적용을 손쉽게 할 수 있도록 하였다. 또한, 그러나 기존의 보수율 개념만 가지고는 실제적인 광손실률 값을 얻을 수 없으므로 장치적용률로서 0.9 정도를 고려해야 실제 현장에서 적용하고 있는 보수율에 근사한 값을 얻을 수 있었다.

• 한국실내디자인학회논문집
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• 제21권6호
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• pp.243-251
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• 2012

Theatricals have been with human's history for a long time. And It is also receiving a lot of love in modern times. The stage is recognized another space of time by spectators during the play and the production actualize fictional world by using all destination things on the stage. Therefore, the design of the stage has symbolism and the production needs semiological. The Elements expressed through the stage is composed of stage equipment, costume, lighting, stage effects and the production needs light, sound and costume designers, a stage manager, grips an advertising director for the play. The study analysis on symbolic image on the view of semigical with focused on "Vishnvovvi sad" of Anton Chekhov. The details of the study are symbolism of stage effect and costume, lighting, stage equipment. Furthermore, The study analyze way to symbolic Express korean characteristics and This research is an excellent source for students who are studying the semilogical analysis of stage.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.838-843
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• 2006

In our modern society, such electric facilities as lighting, elevators, water supplies, drainages, waste water treatments and landscape lighting are being more enlarged, diversified and technology-intensive owing to outstanding technological development, while they require reliable and safe electricity. On the other hand, as more electric energy is consumed with more complicated systems operated, any accident from a personal electric system is likely to have wider spreading effects. In particular, the electric receivers and transformers installed for such public facilities as subway stations require highest safety, reliability and economy, but such requirements tend to be less considered than such financial requirements as budget conditions, much less their safety and reliability. In such a circumstance, this study was aimed at suggesting some standards for safe, reliable and economic subway electric systems in terms of their scale, location and uses. Specifically, this study put forwards the ways to optimize and standardize the electric systems including receivers and transformers for subway stations in order to make them safer, more reliable and economic.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.63-66
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• 2009

Lighting currents are one of major influences on the dynamic performance of ground electrodes. High lighting current intensity changes in the dynamic grounding performance due to ionization of the soil and very fast fronted pulses. The previous analysis has often been based on quasi-static approximation that is not applicable to very fast fronted pulses. To extend the analysis to fast fronted pulses in this paper, the full-wave analysis method based in the rigorous electromagnetic-field theory approach is used and the effects of the ionization of the soil me disregarded. Based on the simulation results, the empirical formulas applicable for slow and very fast fronted lightning current pulses me reviewed; therefore the validity of the theoretical approach is verified through comparison between the calculated and measured results.