• Nuclear Engineering and Technology
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• v.51 no.4
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• pp.996-1007
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• 2019

We investigated the influence of the aspect ratio (H/R) of the oxide layer on the reactor vessel heating in three-layer configuration. Based on the analogy between heat and mass transfers, we performed mass transfer experiments to achieve high Rayleigh numbers ranging from $6.70{\times}10^{10}$ to $7.84{\times}10^{12}$. Two-dimensional (2-D) semi-circular apparatuses having the internal heat source were used whose surfaces of top, bottom and side simulate the interfaces of the oxide layer with the light metal layer, the heavy metal layer, and the reactor vessel, respectively. Multi-cell flow pattern was identified when the H/R was reduced to 0.47 or less, which promoted the downward heat transfer from the oxide layer and possibly mitigated the focusing effect at the upper metallic layer. The top boundary condition greatly affected the natural convection of the oxide layer due to the presence of secondary flows underneath the cold light metal layer.

• Korean Institute of Interior Design Journal
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• v.20 no.5
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• pp.87-95
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• 2011

최근의 현대 건축에서는 재료의 물성과 구축성이 두드러지는 프로젝트를 많이 발견할 수 있다. 이러한 경향의 배경에는 사양한 요인들이 있을 수 있다. 그 중에서도 공간성(性)에 대한 근본적이고 회귀가 중요한 바탕이라고 할 수 있다. 피터 줌터의 건축은 현란한 조형적 효과, 표현만을 위한 기술적 장식을 사용하지 않는다. 대신 그의 건축은 장소와의 관계, 문화적 context 상에서의 맥락, 그리고 공간의 근원적인 경험을 주요한 매체로 사용한다. 그리고 이러한 특수성은 대체적으로 빛과 재료의 고유한 적용으로 나타난다. 이는 장소와 문화의 특성을 관습적인 형태나 화려한 표현으로 재현하는 것이 아니라 '공간감'의 구현으로 구축하는 방식이다. 본 논문은 피터 줌터의 건축에 나타나는 빛과 재료의 구축 방식, 그리고 공간의 경험에 대하여 살펴본다. 그의 건축 구축 방식은 일견 간단해 보일 수도 있으나 실제로는 프로젝트마다 고유한 빛과 재료의 적용과 텍토닉(tectonic)이 내재되어 있다. 본 연구의 목적은 이러한 점들을 자세히 살펴보고 그러한 구축방식이 궁극적으로 어떻게 공간의 경험과 관계를 하는지 고찰하는 것에 있다. 구체적인 사례는 Bruder Klaus Chapel과 Kolumba Museum으로 한정된다. 프로그램은 다르지만 빛을 사용하여 관람자의 공간경험과 공간인지가 어떻게 형성되는지를 다루면서 결론 맺는다.

• Journal of Bio-Environment Control
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• v.22 no.1
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• pp.49-54
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• 2013

In this study, I was focusing on LED (Light Emitting Diode) light effect in growth of chrysanthemum. For this reason, I formed six monochromatic lights (red 650 nm, 647 nm, 622 nm, blue 463 nm, 450 nm, white), six mixed lights sources red : blue (9 : 1, 8 : 2, 7 : 3, 6 : 4, 5 : 5) and 3 control beds in light sources ratio between rad : blue (8 : 2) including sun light. It was totally 15 control beds. Depending on light investigation time in growth, 6/6 (on/off) was highest in the length of plant, the number of leaves, the fresh dry and leaf area. But statistical significance wasn't accepted in general. In case of monochromatic lights, length of plant and leaf area is biggest in the Blue 450 mm and the length of root is highest in RED 650 mm. Except for this 3 measuring points (length of plant, the number of leaves and fresh weight), sun light and white was highest. Besides there are monochromatic light effect but various wavelength range in light sources are needed to crop growth. In terms of mixed light resources, except for sun light, It turned out the length of plant is highest in the highest red light rate red : blue (9 : 1), and Red : white (7 : 3) is highest in fresh weight and dry weight. The sun light is the highest one in the leaf area. The results from LED light effect in growth of chrysanthemum are obviously effect on growth and building up the shape. We need to choose suitable light sources in the monochromatic lights and mixed lights for growing high quality of chrysanthemum or Supplemental Lighting.

• Journal of agriculture & life science
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• v.45 no.2
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• pp.1-7
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• 2011

Three evergreen ground-cover species were tested and evaluated for cold acclimation with different lights in central Korea to enrich the varieties of ground cover plants for over-wintering. Nandina domestica which recently started to be planted in central Korea had high chlorophyll unit with shade condition in both locations, Banpo and Gwacheon during winter. Light condition had no influence on chlorophyll unit in Banpo after April, meanwhile full sun condition decreased chlorophyll unit significantly in Gwacheon, which is exposed to cold wind from north. Ophiopogon japonicas had more than double chlorophyll unit in shade condition compared to that in full light condition in both investigation areas in February. In addition, higher value of L and b in shade condition had been maintained than in full sun condition throughout investigation period. However, leaves in Gwacheon were de-colorized in full sun condition after over-wintering. Pachysandra terminalis had more higher chlorophyll unit in shade condition compared to in full sun condition in both investigation areas in February. But light conditions had not effect the difference of chlorophyll unit of Gwacheon in April. Therefore, The present results suggest that evergreen ground covers with shade condition would be used as landscape materials in the capital area.

• Journal of the Korea Fashion and Costume Design Association
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• v.17 no.3
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• pp.1-11
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• 2015

This study comparatively analyzed the images and preference of lighting space using the emotion-based technique in order to effectively use it in clothing shops and fashion marketing. In terms of color temperature for light sources, 2,800K of lamp color, 6,500K of daylight color and 4,200K of white color were used. For the assessment, sensory evaluation technique was used. Then, the study found the followings: In terms of the image of lighting space by light source, different images were observed by light source with significant difference by the evaluation category. For factor analysis by the evaluation category, 7 factors were extracted. Among them, evaluation on lighting space was influenced by the following three images: modern space, elegant space and classical space. In particular, the modern space comprised of the following adjectives had the biggest effect on the assessment of the image of lighting space ('refreshing,' 'transparent,' 'bluish,' 'bright' and 'non-classical') (primary evaluation 30.13%). According to assessment on the preference of lighting space, the respondents' most favorite lighting space was 4,200K while their least favorable one was 6,500K in terms of color temperature. In terms of preference by the image of lighting space, they didn't like 'non-elegant' and 'non-beige' images even though they had the images of modern space. Therefore, it was confirmed that beige and elegant space images have an effect on the preference of lighting space.

• Journal of the Korean Operations Research and Management Science Society
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• v.38 no.1
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• pp.183-199
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• 2013

This study investigates customers' different behavior in accumulating and redeeming points and focuses on the moderating effect of usage level. We measure the hedonic accumulation and redemption ratio and usage level using loyalty program transaction data and link them to the survey data of loyalty and satisfaction. By doing so, we examine the effects of hedonic accumulation and redemption ratio on a consumer's loyalty intention and his or her satisfaction and the moderating effect of usage level. The result shows that there is a significant positive effect of hedonic accumulation and redemption ratio on customer loyalty and the mediating role of satisfaction on customer loyalty in both stages. And accumulation and redemption most importantly, we find an interaction effect of usage level on outlet type in point redemption stage while no effect in accumulation stage. That is if customers accumulate and redeem points at a hedonic outlets in both stages, it will give him a feeling of satisfaction and finally it will enhance the loyalty toward the focal loyalty program. And light buyers' loyalty increase more than those of heavy buyers when they redeem points in hedonic outlet. Our findings will help marketing managers of loyalty program to apply the effective segmentation strategy to the reward program which affects the customer's satisfaction and loyalty.

• Science of Emotion and Sensibility
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• v.21 no.3
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• pp.3-16
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• 2018

Despite the substantial changes made in the product design field to adopt light as an essential design element, there has been little effort to define how customers respond emotionally to the light design of products. Therefore, it is necessary to analyze the emotional effect of light as a new design element. However, previous research focuses solely on deriving optimal lighting conditions to achieve particular emotional effects. Therefore, this paper investigates the customers' desired emotional effects of product's light design. We studied refrigerators that utilize light as the main design element of the product. We applied mixed methods by combining close-ended questions and open-ended question to efficiently derive the desired emotion. Participants were asked to choose the most favorable refrigerator image in each of the twelve image groups and indicate why they choose that image with the short-answer survey form. Approximately one thousand terms were collected, and those terms were classified into 29 groups using thesaurus relationships. The term groups were again classified into the four big emotion categories and labelled as "abstract quality," "light property," "space perception," and "visual comfort." Also, a model of the relationship between desired light style and light properties was proposed, since we observed the light properties related to three other categories. This study used mixed methods to identify the emotional value of a new design element. We suggest that the emotional categories derived and the proposed relationship model could be used to evaluate the product's light design.

• Journal of Information Technology Services
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• v.13 no.1
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• pp.103-124
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• 2014

Prior studies on knowledge sharing have concentrated primarily on either organizational or individual characteristics. However, by focusing on the interaction between members in On-line communities of practice (CoPs), we seek to identify and analyze factors that affect knowledge sharing by members in CoPs. Therefore, we examine if the independent variables such as interactivity, followership, and trust have positive impacts on the dependent variables such as commitment to CoPs and intention to share knowledge. In addition, this study also investigates the relationship between commitment to CoP and intention to share knowledge. The empirical results show that interactivity has a positive impact on commitment, but an insignificant impact on intention to share knowledge. Besides, trust between members is significantly associated with intention to share knowledge, whereas it does not have a significant effect on commitment. Moreover, followership is significantly related to both commitment and intention to share knowledge. These empirical findings show that the relationship between members in CoPs play a significant, positive role in intention to share knowledge. In conclusion, this research contributes to shedding a light into both interactions between members in and commitment to CoPs that are critical to facilitate knowledge sharing.

• Proceedings of the KIEE Conference
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• 1996.11a
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• pp.254-257
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• 1996

A Rapid Thermal Processing (RTP) system operated below $500^{\circ}C$ has been designed and constructed. It uses an optical pyrometer for measuring wafer temperature, the sensing range of pyrometer is from $2.0{\mu}m$ to $2.4{\mu}m$. To remove the interference effect by IR emitted from lamps an IR filter is adapted which uses water. The best condition for Al alloy using the RTP system is $425^{\circ}C$ for ten seconds. The RTP system uses many lamps for supplying enough power in processing wafer because the absorption wavelength range of IF filter is from $1.3{\mu}m$ to $4.0{\mu}m$. However, reproducibility and uniformity is reduced due to the difference of lamp characteristics. Therefore, for improving the reproducibility and uniformity new RTP system using one lamp is designed. The new RTP system uses a focusing mirror and it focuses the light of lamp. The curverture of the focusing mirror is controlled to supply uniform power in processing wafer. The result of computer simulation shows the possibility of new RTP system using one lamp.

• Journal of Institute of Convergence Technology
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• v.10 no.1
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• pp.13-17
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• 2020

Among the factors that must be taken into account when using thermal imaging cameras that are expanding their application to various fields, a basic study was conducted focusing on temperature on the effect of solar radiation on the photographed thermal image. Through all experiments, in order to use an image taken with a thermal imaging camera for an object installed or located outdoors, a separate temperature correction according to the size of solar radiation or a separate device to block the effect of solar radiation must be additionally installed. Since the temperature of the same object may vary in the thermal image taken indoors or outdoors, it is necessary to calibrate it through comparison with other temperatures as a reference point. In the case of measuring the temperature of a glossy surface such as metal indoors with a thermal imaging camera, it was confirmed that an environment that can remove the light reflection effect by the glossy surface must be constructed and photographed.