• Journal of Korean Society of Industrial and Systems Engineering
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• v.35 no.3
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• pp.187-191
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• 2012

The methods for constructing network of observational locations for measuring water quality in water reservoirs have been widely proposed, but they had some limitations to be applied to river areas, which lie in awkward clustering and finding representative observational locations among locations within each clustering. In this paper, a statistical approach to detect anomaly locations which were significantly different in important measurements for the water quality from the previous locations and construct observational network with them was proposed. Anomaly was detected with the sampling distribution of each primary principal component score, sum of primary PCs, or sum of residual PCs. The empirical study with the data of Nakdong Dam for guiding how to use our proposed approach and showing limitations of previous studied was described.

• The Bulletin of The Korean Astronomical Society
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• v.44 no.1
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• pp.79.4-79.4
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• 2019

We introduce a newly established cosmology research group at the University of Seoul. We also present our recent progress with SDSS Main Galaxy samples and various types of cosmological simulations as follows: (1) A hint for the periodicity of very large-scale structures is found in both SDSS observation and the Horizon Run 4 (HR4) simulation. (2) New galaxy clustering and void finding algorithms, which are thought to be sensitive to the topological shape of galaxy distribution, are developed and tested in both SDSS and HR4 data. (3) Properties such as radial distribution of galaxies or cosmological shock waves are studied in hydrodynamic simulations.

• The Bulletin of The Korean Astronomical Society
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• v.46 no.2
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• pp.56.3-56.3
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• 2021

In a ΛCDM universe, most galaxies are believed to evolve by mergers and accretions. The debris resulting from such processes remains faint and/or diffuse structures, such as tidal streams and stellar halos. Although these structures are a good indicator of the recent mass assembly history of galaxies, they have the disadvantage of being difficult to observe due to their low surface brightness (LSB). To recover these LSB features by reducing the photometric uncertainties introduced by the optics system, we attempt to develop an optimized telescope, called a linear astigmatism free-three mirror system, that minimizes the loss and scattering of light within the telescope. With that prototype, we observe NGC 5907, known as a nearby galaxy with a fabulous loop structure(s), to inspect its performance. After a dedicated data reduction process, including flat-fielding with dark sky flat and sky subtraction, our observation reaches a 1σ surface brightness limit of μlim,r ≃ 28.3 mag arcsec-2 in 10×10 arcsec boxes. We finally identify a single tidal stream that is likely the remnant of a nearly disrupted galaxy. This finding emphasizes that the capability of LSB detection with our telescope is comparable to that of much larger telescopes.

• Journal of the Korean Society of Costume
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• v.53 no.4
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• pp.177-186
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• 2003

This study is based on the observation of clothes excavated from of YeoHung Min( 1586∼1656)'s grave, which enable to understand of woman's funeral clothes among upper class in mid 17C. Lady Min buried with her husband Jung (Clan of Dong Rae)'s grave where located in KwanAk gu, Seoul was move out another place in 1989. During excavation of the grave, 31 pieces form 5 different type of clothes and total 18 pieces form 8 different from Lady Min (Clan of YeoHung). Remarkable finding from the excavated clothes is the Nuwooli(veil) which is known to be discovered first time in Korea, and a piece of tooth, which is related with funeral custom of those day, and cotton seeds are found from chima(skirt) and Jogori(jacket). Jangot(coat) has been used for the use of over garment assuming the changes of Jogori form during mid of Josun dynasty. It is also remarkable that padded and quilted clothing is still being commonly used until mid-l7C.

• Journal of Industrial Technology
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• v.26 no.B
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• pp.53-61
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• 2006

In this research, we have selected the regions of Naerin river and Inbuk river where agricultural activities are actively carried out in the upper Soyang Reservoir and we have observed the changes of water quality while raining after finding out the characteristics of the outflow of floating materials by measuring the water quantity and water quality in division of rainy season and non-rainy season for those floating materials of generating pollutions of turbidity and malnutrition of the water for 4 year from 2002 to 2005. Results of the observation showed that the outflow of floating materials is significantly affected by the surface outflow of rain water, in particular, the surface outflow was great in June -August period of flood seasons.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2006.11a
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• pp.472-475
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• 2006

The purpose of this study is to investigate the residents' neighborship and attitudes for finding influencing factors in an apartment complex. This study is based on a comparative method using a questionnaire, interview and observation. Two neighboring apartments were selected, they have different composition of the apartment complex and are located in Busan. The subjects were 305 wives living in apartments. The major findings are as follows: 1) Matters of common interest and a mutual cooperation were important factors for residents' neighborship. 2) Residents preferred a more opened type composition of the apartment complex for their neighborship. These results could contribute to future study for community development in the apartment complex.

• Korean Journal of Veterinary Research
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• v.35 no.4
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• pp.853-861
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• 1995

A total of 18 lower urinary tract disease(LUTD) cats were examined by radiographical finding. It is difficult of descend to particular on struvite crystal intraurinary bladder by the usual radiographical technique. However, we have lots of informations by imaging processing method on standing-up position radiograph. This method be helpful from now on LUTD research work.

• Journal of Information Technology Applications and Management
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• v.23 no.3
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• pp.25-34
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• 2016

Often we receive misled conclusion in the research if properly variables are not analyzed. In different functional issues of management it is very essential that all the latent and observed variable are properly understood so management decisions will be relevant and effective. The objective of this paper is to investigate the use of different multivariate tools for analyzing in the management research : applied or basic. The sources of data is primary as well as secondary. The primary includes the observation of different research articles of the proceedings of different conferences. And the secondary includes different publications related to multivariate analysis. The study has revealed the reasons of not using such tools of research. The preliminary finding reveals that most of the researches do not use such analytical tools in a comprehensive manner. Carelessness in design while fixing the design aspect is the main reasons of not using appropriate design.

• The korean journal of orthodontics
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• v.24 no.2
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• pp.419-430
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• 1994

The purpose of this study was to investigate the cytotoxicity of orthodontic bands in vitro and in vivo4 types of orthodontic bands were applied to cultured fibroblast and the supernatants were injected into dorsal subcutaneous tissue of mice. In vitro.the cytotoxixity was evaluated by an MTT assay after 2 and 6days. In vivo, the histopathologic observation was performed 2 days after injection. The results were : 1. The cell viability was significantly decreased in the group added phosphoric acid in comparison to control group, but there was not any significance among the experimental group after 2 days. 2. Cell viability decreased in the high Ni containing group after 6 days. 3. The histopathological finding was that the Cr-containing group showed severe infiltration of inflammatory cells and muscular destruction.

• Proceedings of the KWS Conference
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• 2006.10a
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• pp.178-180
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• 2006

The present article aims to develop a numerical method for numerical analysis of fusible filler behavior for self-interconnection process. The CIP(Cubic Interpolated Propagation) method is used for determination of interfaces and the CSF(Continuum Surface Force) model is adopted for evaluation of curvature. To validate these models, first, the present study performs the numerical simulation for a droplet formation and it simulates the interactions among fusible fillers inside resin under the operating condition. As a result, similar tendency is found compared to the experimental observation. This study would be a first step towards finding the optimum condition for self-interconnection process.