• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.1423-1428
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• 2003

We investigated the amount of the toxic gases emitted from the Electrostatic Precipitators(ESPs), which were currently used by indoor air cleaners. We used the wire-to-plate(WTP) type and the needle-to-plate(NTP) type corona discharger in our study. Using the voltage, the polarity of wire, the number of needles of NTP as the input variables, we studied the characteristic of Ozone and $NO_x$ generation in the ESPs. As the results, we found out that the concentration of Ozone, $NO_2$ and $NO_x$ is increased, but the amount of NO is decreased with increasing the voltage and the number of needles. And we knew that the generation rate of ozone and $NO_x$ is very related with the corona region.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.433-433
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• 2016

Carbon nanotubes (CNT) emitter has widely become an attractive mechanism that draws growing interests for cold cathode field emission. CNT yarns have demonstrated its potential as excellent field emitters. It was demonstrated that a small focal spot size was achieved by manipulating some electrical parameters, such as applied bias voltage at the mesh gate, and electrostatic focal lenses, geometrical parameters, such as axial distances of the anode, and the electrostatic focal lens from the cathode assembly, and the dimension of the opening of the electrostatic lens. Electrical-optics software was used to systematically investigate the behavior of the electron beam trajectory when the aforementioned variables were manipulated. The results of the experiment agree with the theoretical simulation results. Each variable has an individual effect on the electron beam focal spot size impinging on the target anode. An optimum condition of the parameters was obtained producing good quality of X-ray images. Also, MWCNT yarn was investigated for field emission characteristics and its contribution in the X-ray generation. The dry spinning method was used to fabricate MWCNT yarn from super MWCNTs, which was fabricated by MW-PECVD. The MWCNT yarn has a significant field emission capability in both diode and the triode X-ray generation structure compared to a MWCNT. The low-voltage-field emission of the MWCNT yarn can be attributed to the field enhancing effect of the yarn due to its shape and the contribution of the high-aspect-ratio nanotubes that protrude from the sides of the yarn. Observations of the use of filters on the development of X-ray images were also demonstrated. The amount of exposure time of the samples to the X-ray was also manipulated. The MWCNT yarn can be a good candidate for use in the low voltage field emission application of X-ray imaging.

• 한국환경생태학회지
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• 제32권4호
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• pp.413-424
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• 2018

본 연구에서는 경주 남산을 대상으로 지형구조 및 해발고도가 음이온 발생량에 미치는 영향을 분석하였다. 분석결과, 기온은 능선부($9.82^{\circ}C$) > 계곡부($8.44^{\circ}C$), 상대습도는 계곡부(59.01%) > 능선부(58.64%), 풍속은 능선부(0.63m/s) > 계곡부(0.37m/s), 일사량은 능선부($34.40W/m^2$) > 계곡부($14.69W/m^2$)로 나타났다. 음이온의 경우 계곡부($636.81ea/cm^3$) > 능선부($580.04ea/cm^3$)로 계곡부가 더 높은 음이온 발생량을 보였다. 해발고도와의 상관성 분석 결과, 계곡부에서는 기온, 상대습도, 일사량, 음이온 발생량과의 상관성이 검증되었으며, 상대습도, 일사량, 음이온 발생량과는 정의 상관관계, 기온과 부의 상관관계가 나타났다. 능선부에서는 기온, 상대습도, 풍속, 일사량, 음이온 발생량과의 상관성이 검증되었으며, 상대습도, 일사량, 음이온 발생량과는 정의 상관관계, 기온, 풍속과는 부의 상관관계가 나타났다. 회귀분석 결과, 기온의 경우 계곡부는 y= -0.006x+9.663 (x=해발고도, y=기온), 능선부의 경우 y= -0.009x+11.595(x=해발고도, y=기온)의 예측식을 얻었다. 상대습도의 경우 계곡부는 y= 0.027x+53.561 (x=해발고도, y=상대습도), 능선부의 경우 y= 0.008x+56.646 (x=해발고도, y=상대습도)의 예측식을 얻었다. 음이온 발생량의 경우 계곡부는 y= 0.577x+521.508 (x=해발고도, y=음이온 발생량), 능선부의 경우 y= 0.605x+549.068 (x=해발고도, y=음이온 발생량)의 예측식을 얻었다.

• 복식문화연구
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• 제21권5호
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• pp.726-741
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• 2013

Malling culture, which refers to the enjoyment of shopping in multi-complex malls with shopping, cultural, and leisure facilities, has emerged as a major trend in society. However, few studies have researched malling culture in depth. This study classified people who go to multi-complex shopping malls as belonging to the baby-boom generation, X-generation, or Y-generation to investigate consumer culture in malls, with an emphasis on user satisfaction and entertainment experiences. Consumers who had shopped in a multi-complex shopping mall during the last 6 months were surveyed. Data were collected through a research company, and responses from 417 subjects were used in the analysis. Among the 417 subjects, 130 were baby-boomers, 136 were from the X-generation, and 151 were from the Y-generation. Investigating the components of multi-complex shopping malls that stimulate entertainment experiences, this study found that exploratory, emotional, and leisure experiences were enhanced when users were more satisfied with the image, atmosphere, and events of shopping malls. In addition, mall image and atmosphere contributed to the improvement of social experiences. With regard to generation, baby-boomers and subjects from the X-generation were generally more satisfied with mall atmosphere, image, and events and had more exploratory and leisure experiences. This study holds significance in that it examined malling culture from a wider perspective than simply the younger generation and presented scholarly and marketing implications based on insights into generational malling culture.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.485-488
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• 2005

The 2nd KOrea Multi-Purpose Satellite (KOMPSAT -2) has been developed by Korea Aerospace Research Institute (KARI) since 2000. Multi Spectral Camera (MSC) is the payload for KOMPSAT -2, which will provide the observation imagery around Korean peninsula with high resolution. KOMPSAT-2 has adopted X-band Tracking System (XTS) for transmitting earth observation data to ground station. For this, data which describes and controls the pre-defined motion of each on-board X-Band antenna in XTS, must be transmitted to the spacecraft as S-Band command and it is called as Tracking Parameter Files (TPF). In this paper, the result of the development of TPF Generation S/W for KOMPSAT-2 X-Band Antenna Motion Control.

• Human Ecology Research
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• 제60권3호
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• pp.377-390
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• 2022

This study identified and compared family values within and across different generations concerning gender roles, attitudes toward diverse families, children, and parental roles. Data were obtained from the 2020 Seoul Family Report Survey. There were 1,949 study subjects, including first- and second-generation baby boomers and individuals in generations X, Y, and Z in Korea. Latent profile analyses were conducted using M-plus. Perceptions and views concerning family values were classified into different types. The main findings were as follows. Two types were identified among first baby boomers, and three were identified among second baby boomers. Most of the first and second baby boomers belonged to the "moderate" type. Two types were detected among those in Generation X. Regarding gender roles, most views of Generation X were slightly progressive, while their other family values were more moderate. Three types were identified among those in Generation Y: "progressive," "moderate," and "very liberal." Generation Z was identified as a "progressive" group. This study provides basic data to explore the direction of the coexistence of generations by identifying and comparing diverse family values within and across generations.

• 가족자원경영과 정책
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• 제27권4호
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• pp.63-74
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• 2023

본 연구는 생활시간의 배분과 균형이 삶의 질을 좌우하는 중요한 요인으로 보고 생활시간의 관점에서 시간사용에 대한 만족감을 통해 기혼여성이 느끼는 행복의 단면을 파악해보고자 하였다. 생활시간조사 자료를 통해 세대별 생활시간구조를 살펴보고, 생활시간의 관점에서 행복에 영향을 미치는 요인을 분석해 보았다. 기혼여성의 행복을 시간차원의 측면에서 분석한 결과, 세대별로 행복을 느끼는 정도와 행복에 영향을 미치는 요인이 다르게 나타났다. 경제활동을 하는 기혼여성의 경우, 베이비붐세대와 X세대의 행복에는 의무시간인 주업시간의 영향력이 가장 컸으며, Y세대의 행복에는 돌봄필요가구원 여부의 영향력이 가장 컸다. 반면, 경제활동을 하지 않는 기혼여성의 경우, 베이비붐세대와 X세대는 자유롭게 사용할 수 있는 봉사 및 여가시간에 따라, Y세대는 성역할태도에 따라 행복수준이 크게 좌우되는 것으로 나타났다. 이처럼 생활시간관점에서 기혼여성이 느끼는 행복수준이 세대에 따라, 그리고 경제활동여부에 따라 다르고, 또 그 영향요인 또한 세대와 경제활동여부에 따라 다르다는 연구결과는 기혼여성 대상 가족정책 수립에 시사하는 바가 크다.

• 한국항행학회논문지
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• 제11권2호
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• pp.163-169
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• 2007

본 논문에서는 x-ray 영상시스템의 영상을 획득하기 위하여 x-ray 발생기와 영상획득시스템 사이의 동기를 맞추어 주는 트리거 발생기를 연구분석 하였다. 무선 트리거 발생기는 디지털영상 획득시스템으로부터 영상획득의 시작을 지시할 수 있는 ACQ_START 신호와 영상획득의 끝을 알리는 ACC_END 신호를 발생시킬 수 있도록 설계하였다. 디지털 영상의 획득은 ACQ_START 신호와 ACQ_END 신호 사이의 시간동안에만 정확하게 이루어지며 무선 원격 x-ray 신호의 검출을 통하여 유선통신 프로토콜 없이 정확한 x-ray 영상의 획득이 가능하고 20 mAs 의 x-ray 레벨에서 3.5 line pair /mm 분해능을 나타냄을 확인하였다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 추계학술대회 논문집
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• pp.315-317
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• 2008

The purpose of this study is to confirm the possibility of wind power generation by a vehicle-induced at the median strip on highway. In order to find out wind field information, a CFD method was used. According to the simulation results, the x, y, z-component of the wind velocity around a median strip are rapidly changed at near before and behind a moving vehicle. The x-component of the wind velocity appears high within the range of the length of the passing vehicle, and the wind direction appeared in the opposite direction at the behind of a vehicle. However, x and y-components of the wind velocity at the behind of vehicle are shown constantly. We confirmed possibility of wind power generation using a vehicle-induced wind at the median strip.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 C
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• pp.1435-1438
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• 1994

The effects of Ge composition variation in $a-Si_{1-x}Ge_x:H$ alloy p-i-n solar cells on the physical properties and current density-voltage characteristics are analyzed by a new simulation modelling based on the update published experimental datas. The simulation modelling includes newly formulated density of gap density spectrum corresponding to Ge composition variation and utilizes the newly derived generation rate formulars which include the reflection coefficients and can apply to multijunction structures as well as single junction structure. The effects in $a-Si_{1-x}Ge_x:H$ single junction are analyzed through the efficiency, fill factor, open circuit voltage, short circuit current density, free carriers, trap carriers, electric field, generation rate and recombination rate. Based on the results analyzed in single junction structure, the applications to multiple junction structures are discussed and the optimal conditions reaching to a high performance are investigated.