• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1994년도 춘계학술대회 논문집
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• pp.94-98
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• 1994

In this study, the thermally stimulated current(TSC) of corona charged PTFE film was studied and the simulation of corona charging process was also calculated by finite element method. The electrets which were formed by appling high voltages(DC-5∼-8[kV]) to PTFE film were experimented to measure TSC in the temperature range of -100∼+200 [$^{\circ}C$] and then the finite element method was accomplished to examine corona charging process using a obtained physical constants. It is confirmed that the charging negative corona is profitable as the applications are manufactured because the time constant of negative corona is much larger than it of positive corona. And it is attempted to estimate the corona charging process in space using simulation.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.303-303
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• 2007

Photo-imageable thick-film lithography technology was developed for the fabrication of embedded passives such as inductors and capacitors. In this study, photo-imageable dielectric and conductor pastes have apoted a negative type. Sodalime glass wafer, alumina substrate and zero-shrinkage LTCC green tapes were used as substrates. In result, The lithographic patterns were designed as lines and spaces for conductor material, or via-holes for ceramic, LTCC, materials. The scattering and reflection of UV-beam on the substrate had negative effects on fine patterning. The patterning performance was varied with the exposing and developing process conditions, and also varied with the substrate materials. Fine resolution of less then $50/50{\mu}m$ in line and space was obtained, which is difficult in screen printing method.

• 터널과지하공간
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• 제6권1호
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• pp.1-9
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• 1996

Pocheon granite specimens were thermally treated with cycles of predetermined temperatures ranging 2$0^{\circ}C$ to $600^{\circ}C$. Characterization of thermally-induced microcracks were carried out using optical microscopy and their effect on the various physical & mechanical properties were studied. Generally. uniaxial compressive strength, Young's modulus, Poisson's ratio, elastic wave velocity and specific gravity were found to decrease with increasing temperature. From 30$0^{\circ}C$ upwards, negative lateral strains were observed, which resulted in negative Poisson's ratio. Dynamic Young's modulus and Poisson's ratio were found to be generally most sensitive indicators to thermal cracking.

• Journal of Astronomy and Space Sciences
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• 제19권2호
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• pp.141-150
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• 2002

전리층은 우주환경의 변화에 매우 중요한 역할을 하고 있다. 특히 전기전도도 분포에 관한 정보는 자기권-전리층 상호작용을 이해하는데 필수적이다. 이러한 요구에 부응해서 전기전도도를 구하려는 다양한 시도가 있었다. 본 연구에서는 SuperDARN(Super Dual Auroral Radar Network) 레이더망 중 Goose Bay 및 Stokkseyri 레이더에서 관측한 전기장과 Greenland의 서부해안에 설치된 지자기 관측소에서 동시에 얻은 지상 지자기 기록을 이용하여 전기전도도를 추정하였다. 또한 전리층을 흐르는 전류를 무한판상으로 가정하고 Biot-Savart 및 Ohm의 법칙을 적용하여 Hall 및 Pedersen 전기전도도를 추정하였다. 예상한대로 Hall 전기전도도는 오로라 제트전류대의 중심을 따라 상당히 강화됨을 알 수 있었다. 그러나 Pedersen 전기전도도는 광범위한 지역에 서 음의 값이 나타났다. 이러한 문제를 보완하기 위해서 지자기 변화 성분인 ${\Delta}D$에 연자기력선 전류의 효과를 고려하였다. 그 결과 이전에 음으로 나타난 지역이 상당히 감소되었다. 따라서 지상 지자기 변화 자료와 레이더에서 관측된 전기장을 이용해서 전기전도도를 구하는 경우 연자기력선 전류의 효과를 고려해야 한다.

• 한국실내디자인학회논문집
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• 제20권5호
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• pp.42-50
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• 2011

In the 21st century, people began to pay more attention on the culture, and the chances for them to participate in the cultural lives also increased. The spaces for entertainments can also be deemed as the center of the cultural contents. The entertainment is, in consideration of its definition by the literal meaning and the origin of the word itself, 'an act that entertains, or any artificial creation that is designed to give entertainment with a view to relieve the subjects from the burdens they have as they live.'Of the modem entertainment spaces, the one with the most profound visual manifestation of the entertainment element is the club. The purpose of this study is to examine the influence from the entertaining element manifested in the club spaces. Only until a few years back, the club spaces were deemed with negative impressions that comes with the more negative side of the entertaining world. But, recently such negative impressions are lift off considerably, and the club spaces are regarded with positive impressions as to be the kind of place where the young people can enjoy performances and other kind of culture in healthy atmosphere. In Chapter 2, we will examine the entertainment and the nature of the pleasure it gives, as well as the correlation between the entertaining environments and the pleasure they give. In chapter 3, the entertaining elements within such contexts are classified into the experience, form, color, objects, and the lightings and examine the characteristics of each of them. Also, the influences of these elements to the entertaining environment will be reviewed. In the case study in chapter 4, 9 overseas and domestic club spaces that were introduced in 'Interior World' magazines, that is, in the issues that are focused on 'Entertainment,'such as Issue 59, 68, and 79. As a result of the analysis, the influences of the entertaining, or pleasing, elements were discovered. The particular expression characteristics of the pleasing designs in the club spaces are, namely, the form elements, material elements, color elements, objects elements, and the lighting elements. As the society changes and the cultural level goes up, the club spaces are required to adopt more changes. Therefore, the pleasing elements of the space should receive further emphasis. These elements will act as a trend in the space and make the people appreciate the space more refreshing.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2011년도 한국우주과학회보 제20권1호
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• pp.26.3-27
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• 2011

Formation of a steep plasma density gradient in the middle-latitude ionosphere during geomagnetic storms and the latitudinal migration of its location depending on the storm phase are suggested to be associated with the ionospheric signature of the plasmapause. We test this idea by using the satellite and ground observation data during the 11 April 2001 storm. The locations of the steep plasma density gradient identified by TOPEX/Poseidon (2001 LT) and DMSP (1800 and 2130 LT) satellites coincide with the ionospheric footprints of the plasmapause identified by the IMAGE satellite. This observation may support the dependence of the middle-latitude plasma density gradient location on the plasmapause motion, but does not explain why the steep density gradient whose morphology is largely different from the morphology of the middle-latitude ionization trough during quiet period is formed in association with the plasmapause. The ionospheric disturbances in the total electron content (TEC) maps shows that the steep TEC gradient is formed at the boundary of the positive ionospheric storm in low-middle latitudes and the negative ionospheric storm in middle-high latitudes. We interpret that the thermospheric neutral composition disturbance in the dayside is confined within the middle-high latitude ionospheric convection zone. The neutral composition latitudes and, therefore, the locations of the steep plasma density gradient coincide with the footprints of the plasmapause. The TEC maps show that the appearance of the steep plasma density gradient in the pre-midnight sector during the recovery phase is related to the co-rotation of the gradient that is created during the main phase.

• Human Ecology Research
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• 제52권5호
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• pp.457-471
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• 2014

Family instability has a negative effect on not only an individual household but also the society. The government continues to operate family support centers as a countermeasure to family instability issues. A healthy and multicultural family support center is considered an effective support system that extends from a family unit to the local community. In this study, the satisfaction and demand levels of each center, located in Seoul and Incheon, were examined with respect to items such as operation contents, physical space, and organizational structure. The results showed that various efforts for creating a family-friendly community were implemented in healthy family support centers and multicultural family support centers. It was found that the center organizers and operators focused more on software and programs than on the physical environment. There was mostly a shortage of physical and environmental space. This space shortage limited the planned and ongoing activities in terms of the residents' self-directed participation and space formation for a family-friendly educational culture. Therefore, it was necessary to set up the space-related criteria for each center in order to solve this environmental issue. We identified the baseline data of the criteria for a center's physical and spatial design and size. In particular, it was suggested that a more strategic physical and spatial design is needed to achieve an integral and effective operation for the connection of the family with the local society.

• 아동학회지
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• 제29권1호
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• pp.227-241
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• 2008

This research explored contemporary cities and children's lives in picture books by a survey of 71 picture books published and translated into Korean from 1996 to 2006. These books represented city or urban life as their settings with children or personified animals as their main characters. They were classified by four categories. Results were the city space that most frequently appeared in the picture books were streets (73%) including downtown (38%) and back streets (6%). Emotions displayed by children in the city were mainly negative feelings (60%) including fear, worry, sadness, and boredom. The most important issue was alienation (28.5%). Main characters barely managed to cope with life in the city (76%).

• Journal of Astronomy and Space Sciences
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• 제6권2호
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• pp.75-89
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• 1989

The Spacelab 1 data represented the first multiband spectral measuremets of the ${N_2}^{+}$ first negative ion bands system in the thermospheric dayglow, and the first opportunity to make a detailed comparison of the vibrational and rotational distributions over bands out to v'=5. The main purpose of this study was to decuced the excitation processes of ${N_2}^{+}$(1N) bands by determining vibrational population distributions for the upper states of ${N_2}^{+}$(1N). The vibrational population distributions to achieve a best fit to the measured Spacelab 1 data were summarized and also compared with those theoretically derived.

• Wind and Structures
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• 제19권2호
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• pp.185-197
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• 2014

Ventilation and fire safety design in road tunnels are one of the most complex issues that need to be carefully considered and analysed in the designing stage of any potential upgrade of ventilation and other fire safety systems in tunnels. Placement road tunnels space has an important influence on fire safety, especially when considering the effect of adverse wind conditions that significantly influence ventilation characteristics. The appropriate analysis of fire and smoke control is almost impossible without the use of modern simulation tools (e.g., CFD) due to a large number of influential parameters and consequently extensive data. The impact of the strong wind is briefly presented in this paper in the case of a longitudinally ventilated road tunnel Kastelec, which is exposed to various severe wind conditions that significantly influence its fire safety. The possibility of using CFD simulations in the analysis of the tunnel placement in space terms negative effect of wind influence on the tunnel ventilation is clearly indicated.