• 천문학회보
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• 제35권2호
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• pp.37.1-37.1
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• 2010

A high redshift quasar is useful to investigate the early part of our universe. Since they are one of the brightest objects in the early universe, they can provide us with clues of the growth of super massive black holes and the early metal enrichment history. To discover the high redshift quasars, we designed a survey of wide area and moderate depth; Infrared Medium-deep Survey (IMS), a J-band imaging survey of ~200 deg2 area where the multi-wavelength data sets exist. To obtain the J-band data, we are using the United Kingdom Infra-Red Telescope (UKIRT), and so far we have covered~40 deg2 with Y- or J-bands over 36 observing nights. We used color-color diagrams of multi-wavelength bands including i, z, Y, J, K, $3.6{\mu}m$ and $4.5{\mu}m$ to select high redshift quasars. The major challenge in the selection is many M/L/T dwarfs, low redshift galaxies, and instrumental defects that can be mistaken as a high redshift quasar. We describe how such contaminating sources can be excluded by adopting multiple color-color diagrams and eye-ball inspections. So far, our selection reveals one quasar candidates at z~7 and a few candidates at z~6. In this poster presentation, we will update the current status of the quasar selection in the IMS fields.

• 한국해안·해양공학회논문집
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• 제23권1호
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• pp.101-108
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• 2011

염분도 수치계산의 목적은 낙동강 하구둑 상류로 침투되는 염수 쐐기 침입을 분석하여 담수량을 확보하는데 있다. 염분 침투가 발생되는 조건은 바다에서의 조석 분포에 따라서 침투길이가 달라지고 있으므로 염분농도는 조석의 현상에 따라서 달라진다. 이러한 현상을 확실히 파악하면 보다 효율적으로 염분 침투를 차단할 수 있다. 본 연구에서는 염분 침투에 대해서 ECOMSED 모델을 이용하여 낙동강 하구둑 상류로 침투되는 염분농도를 정확히 추정함으로써 낙동강 하구둑의 존재를 재평가하게 될 것이다. 또한 이 모델의 타당성을 입증하기 위해 실제 관측값과 비교하였다. 분석결과 ECOMSED모델은 상류 유입유량이 $130m^3/s$의 경우가 $75m^3/s$보다 실제 관측값과 거의 동일한 값을 나타내었다. 따라서 유입유량이 많은 경우가 적은 경우보다 예측이 정확한 것을 알 수 있다.

• 한국정보전자통신기술학회논문지
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• 제10권4호
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• pp.279-287
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• 2017

The aim of this study is to verify the difference in the level of happiness and preparation for old age according to the general characteristics of senior welfare center attendees. The subjects of the study were 148 attendees of OO senior welfare center in Seoul and a survey was conducted from July 4 to October 7, 2016. The method of analysis was by using the SPSSWIN 18.0 program, a 5% level of significance was verified in a frequency analysis, t-test, one-way ANOVA, correlation analysis, and multiple regression analysis. The results showed that first, from investigating the difference in the level of preparation for old age according to general characteristics, there was a significant difference according to age, occupation, monthly income, and physical condition but there was no significant difference according to gender and level of education. Second, as a result of observing the difference in the level of happiness according to general characteristics, although there was a significant difference according to occupation and monthly income, the difference level according to gender, age, level of education, health condition was less than a 5% level of significance. Third, from observing the correlation between the level of happiness and preparation of old age, it was found that happiness was positively correlated to preparation for old age in the following order: physical preparation for old age ((r=.576, p<.001), economic preparation for old age (r=.570, p<.001), psychological preparation for old age (r=.526, p<.001), social preparation for old age (r=.525, p<.001). It is forecasted that this study will be used as base line data for improvement of happiness and preparation for old age for the elderly according to general characteristics.

• 대한원격탐사학회지
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• 제27권1호
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• pp.1-7
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• 2011

다목적 실용위성 3호, 5호, 3-A호 등 다양한 고해상도 센서를 탑재한 국산 위성이 곧 발사될 예정에 있을 뿐 아니라, 기후변화에 의한 재난재해 빈발 등 각종 범지구적 문제 발생에 따른 세계 각국의 지구 관측 활동이 활성화되면서 우리나라도 침체되어 있는 위성영상정보 활용의 범위와 깊이를 확대하기 위한 노력을 시작하고 있다. 본 연구에서는 이를 위한 첫 번째 단계로 국외의 위성영상정보 활용 관련 기술개발 현황 및 시장전망에 대한 분석과 함께 국내 위성영상정보 활용자들을 대상으로 위성영상정보 수요 및 활용 제약 요인들에 대한 온라인 설문조사와 인터뷰를 수행하였다. 조사결과 전처리과정의 표준화와 함께 각종 관련 기술 자료들의 공개, 신속하고 체계화된 자료 배급체계의 구축이 매우 시급한 것으로 나타났으며, 이러한 분석 결과는 향후 수립될 예정으로 있는 위성영상정보 활용 확대 방안의 기초 정보로 활용될 수 있을 것으로 기대된다.

• 천문학회보
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• 제35권2호
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• pp.67.2-67.2
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• 2010

We present results of searching for the Very Low Luminosity Objects (VeLLOs; internal luminosity : $L_{int}$ < $0.1(d/140pc)^2\;L\odot$) in the Gould's Belt clouds using observations from 3.6 to 70 micron by the Spitzer Space Telescope. The clouds are California, Chamaeleon I, III, Musca, Lupus V, VI, Scorpius, Serpens, Corona Australis, Cepheus, and IC 5146 having the properties of active low-mass star-forming such as the Taurus cloud. The observing sensitivity of the Spitzer data is estimated to be about $L_{int}\;\geq\;5\times10^{-3}(d/140pc)^2\;L\odot$, a factor of 20 better than that of the Infrared Astronomical Satellite (IRAS). The observing data were processed by the c2d Legacy pipeline. As the criteria to select the VeLLOs, we slightly modified previous ones by Dunham et al. The most important criterion is a flux density at 70 micron that is directly converted to the internal luminosity. Also, we used additional criteria to remove the contamination of evolved stars and extragalaxies which have colors or SEDs very similar to YSOs. We identified a total of 64 new embedded VeLLO candidates with $L_{int}$ < $0.1(d/140pc)^2\;L\odot$, consisting of 8 in California, 15 in Chamaeleon-Musca, 13 in Scorpius-Lupus, 20 in Serpens, 3 in Corona Australis, 3 in Cepheus, and 2 in IC 5146. The classification of the spectral index (${\alpha}$) fitted to the shape of the Ks-24 micron SEDs shows most of VeLLO candidates (89%) are in types of Class I and Flat spectrum. We plot various diagrams based on their 2MASS-Spitzer bands colors and magnitudes to discuss properties of the VeLLOs. This search will lead us new adventure toward a future systematic study of the VeLLOs.

• 한국실내디자인학회논문집
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• 제22권1호
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• pp.3-10
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• 2013

This study, with a space of cafeteria for the object, selected adjective and space for space evaluation based on existing dissertations and experts' survey so as to analyze the perception features by adjective into perception types. At space evaluation, the purpose of visiting the cafeteria was setup for test. Analysis of what perceptual information on the space was acquired enables to set up any features at a space and the direction of designing. The approach through the evaluation of space perception assigning this kind of observing intentionality can be applied to emotion technique which connects a designer to customers. From this study, the following conclusion has been reached. Frist, the difference at perception type by gender is formality, which is higher with women than men. When it is considered that other types are identical, it can be seen that the formality is the perception type to decide the selection of gender and has the highest average value among all the three types. On the whole, men have the tendency for regarding spaciality as the most important, while women have that for looking upon formality as such. Second, to the question what element they would see first when visiting for conversation, men and women answered respectively that they would see partition (35.6%) and chairs (38.0%). Men had a very strong propensity for the element of area section(partition) supporting the activity of purpose and women regarded the element of behavior support(chair) carrying out the activity of purpose as important. Third, the analysis of deviance shown at the formality of perception type showed that men had dispersive selection at the process of selecting all adjectives and their features at the process of space perception were higher than spaciality and fancine.

• 영어어문교육
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• 제12권4호
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• pp.159-183
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• 2006

The purpose of this study is to investigate Korean primary school English teachers' beliefs on self-directed teaching and learning for facilitating student's self-directed learning. A survey was conducted, using 315 primary school teachers as participants. According to different school areas, sex, English teaching careers, and types of English teaching like classroom teachers or English specialist teachers, beliefs on teachers' self-directed teaching were studied based on class planning, class process, utilization of human resources, development and utilization of teaching materials and class evaluation. The results of this study are as follows: first, differences were not shown except class planning according to teachers from different school areas. Second, sex and beliefs of teachers' self-directed teaching had nothing in common. Third, differences were shown in class planning and class process, according to English teaching careers. Finally, according to types of English teaching, differences were shown in class process and development and utilization of teaching materials. The study suggests that it is necessary to conduct other studies for observing primary English classrooms focusing on teacher's self-directed decision-making.

• 천문학회지
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• 제31권2호
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• pp.95-99
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• 1998

We report preliminary results of an on-going survey of optically selected barred galaxies with $^{12}CO$(J=1-0) line. The entire sample is composed of about 100 bright barred galaxies ($B_T{\le}13$) with small inclination angle. Most of the galaxies are relatively nearby with receding speed less than 10,000 km/sec. In the first observing run, we have observed central parts of 18 galaxies and detected CO emissions from 5 galaxies (NGC521, 2525, 4262, 4900, and 7479). Most of these galaxies are not observed with CO previously, except for NGC7479 which has been studied at various wavelengths. The peak antenna temperature of detected galaxies ranges from about 30 to 300 mK.

• 대한간호
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• 제30권1호
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• pp.51-62
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• 1991

The Study was carried out for the purpose of investigating the degree of perception in nursing activities. This study reports perceptions of nurses on the choices they make among competing activities, contrasts this perception with their opinion of what tasks they would like to spend time on. A sample of 231 clinical nurses was selected to participate in this study at two genernal hospitals in Seoul. The data was collected from July 10th to 25th, 1990. Subjects were instructed to rate one of five points likert type scale on the 43 items of nursing activities. Analysis of data was done by means of the SPSS-X Program using frequency, t-test and ANOVA. The results of this study were as follows; 1. The characteristics of the subjects were as follows: The age group of 25-29 yeares was 45.9%. For religion, Christians had the highest score, 68.4 % and singles in subjects were 81.4%. For academic background, 64.5% were graduated from nursing junior colleges. In the subjects, staff nurses were 86.6%. 22.5% of them had worked for less than 1 year and 20.8% had 37 months to 5 years experience at the time of the survey. 62.8% were satisfied with the job. 2. The perception level of nursing activities: 1) The mean score for perception of professional nursing functions was 4.157 point, with a maximum score set. at 5 points. The mean score for perception of priorities was 3.781. Perception of spending time was 3.932. 2) In perception of professional nursing functions, more important items were Aseptic technique (4.866), Shift and exchange of information concerning patients(4.654), Observing patients (4.799). Less important items were Transporting patients(3.411), Changing linens(3.442), Giving a bed shampoo (3.506). In priorities, more important ones. were Aseptic technique(4, 706), Shift and exchange of information concerning patients (4.524.), Observing patients(4.390), Taking vital signs (4.355). And less important ones were Changing linens (3.100), Giving bed baths(3.113), Giving back rubs(3.121). In spending time, more important ones were Aseptic technique(1.706), Observing patients (4.532), Shift and exchange of information concerning patients(4.532). And less important ones were Changing lines(3.368), Transporting patients(3.394), Giving bed baths(3.450). 3) In the role perception level, the mean distribution of perception was 3.511- 4.335; the role was perceived to be in order of frequency as a facilitator, coordinator, change agent and advocator role. The most important scale of factors by nursing activities was indirect nursing activities.

• 천문학회지
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• 제49권3호
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• pp.93-107
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• 2016

Augmenting the Wide Field Infrared Survey Telescope (WFIRST) microlensing campaigns with intensive observations from a ground-based network of wide-field survey telescopes would have several major advantages. First, it would enable full two-dimensional (2-D) vector microlens parallax measurements for a substantial fraction of low-mass lenses as well as planetary and binary events that show caustic crossing features. For a significant fraction of the free-floating planet (FFP) events and all caustic-crossing planetary/binary events, these 2-D parallax measurements directly lead to complete solutions (mass, distance, transverse velocity) of the lens object (or lens system). For even more events, the complementary ground-based observations will yield 1-D parallax measurements. Together with the 1-D parallaxes from WFIRST alone, they can probe the entire mass range M ≳ M_⊕. For luminous lenses, such 1-D parallax measurements can be promoted to complete solutions (mass, distance, transverse velocity) by high-resolution imaging. This would provide crucial information not only about the hosts of planets and other lenses, but also enable a much more precise Galactic model. Other benefits of such a survey include improved understanding of binaries (particularly with low mass primaries), and sensitivity to distant ice-giant and gas-giant companions of WFIRST lenses that cannot be detected by WFIRST itself due to its restricted observing windows. Existing ground-based microlensing surveys can be employed if WFIRST is pointed at lower-extinction fields than is currently envisaged. This would come at some cost to the event rate. Therefore the benefits of improved characterization of lenses must be weighed against these costs.