• The Bulletin of The Korean Astronomical Society
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• v.35 no.1
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• pp.51.1-51.1
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• 2010

We present the interim results of simultaneous observations of SiO and H2O masers toward 401 known stellar SiO and/or H2O maser sources (166 both SiO and H2O maser sources, 83 only SiO maser sources, and 152 only H2O maser sources) using KVN_Yonsei telescope. The results of 166 known SiO/H2O maser sources will be presented by Kim et al. and the results of 83 only SiO maser sources and 152 only H2O maser sources presented here. Both SiO and H2O maser emission were detected from 30 sources giving a detection rate of 36 % toward known 83 only SiO maser sources, while they were detected from 66 sources giving a detection rate of 43 % toward known 152 only H2O maser sources at one epoch observation. Only SiO masers were detected from 42 sources toward 83 only SiO sources, while they were detected from 28 sources toward 152 only H2O sources. Characteristics of these observed sources in the IRAS two-color diagram is investigated including mutual relations between SiO and H2O maser emission. In addition, these results will be useful for statistical study of late-type stars and future VLBI observations.

• KIEAE Journal
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• v.14 no.1
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• pp.39-48
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• 2014

In the previous test, the verification of the standard floor impact source was carried out comparing the physical characteristics with living impact sources. The result was appeared the validation of the standard impact source was very low because of differences of physical characteristics. This study aims to evaluate annoyance and loudness of standard impact source which is used for the measurement of floor impact sound, and to compare the annoyance and loudness of living impact sources which are produced in real life. The impact sources considered are tapping machine, tire and impact ball as standard sources, and nine real sources which were chosen from the existing researches. The result showed differences of annoyance and loudness between standard impact sources and living impact sources, which means the standard impact sources may rate the performance of floor system inappropriately. In the future, the rating method should be examined how the standard impact sources are similar with real sources in the point of rating the performance of floor system.

• Journal of Korea Technology Innovation Society
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• v.8 no.2
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• pp.732-756
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• 2005

This paper attempts to find the sources of materials technology innovation and to analyze the relationships between the sources and materials technology innovation. Starting from the traditional hypothesis on the innovation sources (e.g. technology-push, demand-pull and user-supplier), materials scientific knowledges, materials processing technologies and users' needs are found as three main sources of innovation in materials technology. There are not only close interactions between the sources and materials innovation, but also the interactions among the sources of innovations play important roles for materials technology innovation. This paper discusses the characteristics of interactions between sources of innovation in materials technology. This study on the sources and interactions among sources may provide important information for policymaking in materials technology

• Journal of Environmental Impact Assessment
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• v.9 no.3
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• pp.163-176
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• 2000

The purpose of this study is to analyze the pollutant loads and its distribution, and to suggest the management of nonpoint sources in Daechong Reservoir. The loads from point and nonpoint sources such as population, industry, livestock and land use were calculated per stream or river with topography(1:25,000) of the watershed of Daechong Reservoir. The generating pollutant loads were obtained through multiplication of pollutant sources by generating pollutant quantity per unit pollutant source. The effluent point sources loads is defined as loads from wastewater treatment facilities such as domestic, industrial and livestock wastewater treatment facilities, which were calculated through multiplication of effluent flowrates by water quality constituents concentration. Untreated point sources loads were estimated to be 35 % of total point sources loads. The effluent nonpoint sources pollutant loads were obtained through the multiplication of generating nonpoint sources loads by effluent ratios based on previous studies. The effluent nonpoint sources loads have the ratio of 26.2% of total BOD effluent loadings, 20.1% of total T-N effluent loadings, and 10.5% of total T-P effluent loadings. For the reduction of nonpoint sources loads in Daechong Reservoir, silviculture, artificial wet land, and grassed waterways could be applied. And untreated livestock waste scattered can result in nonpoint loadings, so required the livestock wastes treatment facilities and purifying facilities together with the management of shed, pasture, livestock waste storage site and composting site. Finally, remote sensing and GIS should be applied to the identification of distribution of water quality, watershed, the location and scale of nonpoint sources, effluent process during rainfall, for more detailed analysis of nonpoint sources.

• The Bulletin of The Korean Astronomical Society
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• v.35 no.2
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• pp.33.2-33.2
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• 2010

Galaxy clusters are known to be very bright in X-ray and contain a large number of X-ray point sources within the X-ray emission. However, due to the fluctuations of the X-ray emission, it is very difficult to detect faint X-ray sources and to extract accurately the photometric properties of the X-ray point sources in galaxy clusters. In addition, the most X-ray telescopes show spatially varying point spread function (PSF) and suffer from severe vignetting. The Chandra Archival Survey of Galaxy Clusters project is a wide-area ($\sim40deg^2$) survey of serendipitous Chandra X-ray sources in galaxy cluster fields, containing ~58,000 X-ray point sources in ~800 Chandra ACIS observations of ~600 galaxy clusters. This project aim to investigate the density environmental effects on the physical properties of the X-ray point sources, comparing physical properties of the X-ray point sources in galaxy clusters to those in typical fields. To utilize the sensitivity and detection probability of the X-ray point sources in galaxy clusters, we perform extensive Monte-Carlo simulations. In this poster, we compare the detection probability of the X-ray point sources in galaxy clusters to that of typical fields, and discuss quantitatively the difference between them.

• The Journal of the Acoustical Society of Korea
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• v.31 no.4
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• pp.214-224
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• 2012

The objective of this paper is to design multichannel spherical loudspeaker array by considering various positioning methods such as Gaussian grid, Lebedev grid and packing method. For the spatial sound manipulation, which is to make desired sound field by controling multiple sound sources, the Kirchhoff- Helmholtz integral states that sound fields can be reproduced in terms of infinite control sources on the integral surface. But since we cannot control infinite number of sources for the implementation, we have to allocate finite number of sound sources which can approximately act as infinite number of sources. To manipulate sound field inside of a sphere (which is typical example of three dimensional array) by controlling sound sources on the surface, three methods of allocating sound sources, which are Gaussian grid, Lebedev grid and packing method, are reviewed. For each geometry, the performances of manipulation rendered by time-reversal operator and higher-order ambisonics are compared.

• Journal of the Korean Society of Clothing and Textiles
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• v.20 no.2
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• pp.336-349
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• 1996

This dissertation was aimed to analyze correlation between jeans wearing attitude and the use of information sources which influnece the new generation consumers' marketing strategies of jeans industry. Subjects were 443 new generation women living in Seoul. Data were obtained by self administered qestionaire and analyzed by SPSS package. The main findings of this research are as follows : 1. A result of factor-analysis of the new generation consumers' jeans wearing attitudes variables were typed 5 factors of practicality pursuit, fashion pursuit, sexual attraction pursuit, individuality pursuit and famous brand pursuit. 2. A result of factor-analysis of the use of information sources variables were classified 4 factors of marketer-dominted sources, neutral sources, consumer.dominated sources and personal sources. 3. In anlysis between jeans wearing attitudes and demographic characteristics, fashion pursuit, individuality pursuit and sexual attraction pursuit showed significant difference partially 4. In analysis between the use of information sources and demographic characteristics, marketer-dominated, neutral and personal sources showed significant difference partially. 5. In correlation and regression between jeans wearing attitude and the use of information sources, there were high relations partially and fashion pursuit variable of jeans wearing attitude was the most influential.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1299-1301
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• 2006

A visual display is formed by picture elements, which are optically coupled to optical pathways through which light is supplied from light sources. Light sources, controlled by control hardware, transmit light to the optical pathways by scanning light from the light sources to different optical pathways. The light sources and the optical pathways are mutually oriented so that light from the light sources can be canned to different optical pathways to form the displayed image. Light sources can be mounted to a rotating mounting that rotates past static pathways that transmit coupled light to the waveguide screen.

• The Bulletin of The Korean Astronomical Society
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• v.39 no.1
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• pp.79.2-79.2
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• 2014

A few years from now, gravitational wave (GW) detectors of LIGO and VIRGO consortiums are expected to reach the sensitivity necessary to detect GW signals from astronomical sources. Identification of the counterparts to the GW sources in electromagnetic wave is very important, since the localization of the GW signals is going to be very poor (~1000 $deg^2$) for the first detections and the nature of the GW-emitting sources will be uncertain with the GW detection only. In this talk, we will discuss possible astronomical sources that could be responsible for the first GW signals, and outline our current efforts to do follow-up observation of GW sources in collaboration with LIGO/VIRGO groups.

• Journal of Astronomy and Space Sciences
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• v.5 no.2
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• pp.143-158
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• 1988

Since the successful observation by Uhuru, the first astronomical satellite, X-ray astronomy has become one of the rapidly developing fields in astronomy. The scientific results provide us the unique opportunity to understand the high energy nature of X-ray sources. We now know that our galaxy contains many different types of X-ray sources such as the compact X-ray sources, galactic bulge sources in addition to the Sun, the brightest X-ray sources in the sky. In this study we review the general properties of galactic X-ray sources, the characteristics of periodic compact X-ray sources, and bursters as well as the models.