• Journal of Korean Society for Atmospheric Environment
• /
• 제13권1호
• /
• pp.51-63
• /
• 1997

Total suspended particulate matters in the ambient air were analyzed for eight chemical elements (Ca, Co, Cu, Fe, Mn, Pb, Si, and Zn) using an x-ray fluorescence spectrometry (XRF) at the Kyung Hee University - Suwon Campus during 1989 to 1994. To use these data as basis for source identification study, membership of each sample was selected to represent one of the well defined sample groups. The data sets consisting of 83 objects and 8 variables were initially separated into two groups, fine (d$_{p}$<3.3 ${\mu}{\textrm}{m}$) and coarse particle groups (d$_{p}$>3.3 ${\mu}{\textrm}{m}$). A hierarchical clustering method was examined to obtain possible member of homogeneous sample classes for each of the two groups by transforming raw data and by applying various distances. A disjoint principal component analysis was then used to define homogeneous sample classes after deleting outliers. Each of five homogeneous sample classes was determined for the fine and the coarse particle group, respectively. The data were properly classified via an application of logarithmic transformation and Euclidean distance concept. After determining homogeneous classes, correlation coefficients among eight chemical variables within all the homogeneous classes for calculated and meteorological variables (temperature. relative humidity, wind speed, wind direction, and precipitation) were examined as well to intensively interpret environmental factors influencing the characteristics of each class for each group. According to our analysis, we found that each class had its own distinct seasonal pattern that was affected most sensitively by wind direction.ion.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
• /
• pp.528-529
• /
• 2008

A new concept based on sample current measurements for detecting of via-hole defects on wafer has been performed by low energy electron beam microcolumn. The microcolumn has been operated at a low voltage of 290 eV with total emission current of 400 nA, and a sample current of 6 nA. The test sample was fabricated with SiO2 layer of 300 nm thickness on a piece of a silicon substrate. Preliminary results of both sample current method and secondary electron method show microcolumn and its control can be useful technology for detecting of via-hole defects on wafer.

• Journal of Photoscience
• /
• 제9권2호
• /
• pp.463-465
• /
• 2002

RIKEN Structural Genomics Beamlines have been constructed for the crystallographic analysis in the structural genomics research at synchrotron radiation facility SPring-8. Synchrotron radiation accelerates the crystallographic analysis of protein structure. The target of the research and development is focused on the automatic beamline operation to maximize beamline efficiency. We are developing the sample management system, which is composed of the sample auto-changer and the database system, for high-throughput data collection. The sample management system and the beamline operating system make it possible to execute automatic data collection without any operators. The beamlines will be ready for user operation in autumn 2002. The concept of automatic beamline operation and the present status of RIKEN Structural Genomics Beamlines will be presented.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제9권2호
• /
• pp.29-43
• /
• 2005

We consider a surface reconstruction problem from geometrical points (i.e., points given without any order) distributed on a series of smooth parallel cross sections in ${\mathbb{R}}^3$. To solve the problem, we utilize the natural points ordering method in ${\mathbb{R}}^2$, described in [18], which is a method of reconstructing a curve from a set of sample points and is based on the concept of diffusion motions of a small object from one point to the other point. With only the information of the positions of these geometrical points, we construct an acceptable surface consisting of triangular facets using a heuristic algorithm to link a pair of parallel cross-sections constructed via the natural points ordering method. We show numerical simulations for the proposed algorithm with some sets of sample points.

• Journal of Korean Library and Information Science Society
• /
• 제30권4호
• /
• pp.183-206
• /
• 1999

The purpose of this research is to evaluate the service quality measure and service quality level between one sample library and the other. Most typically, service quality is defined in terms of reducing the gap between customer expectations and the actual service provided. This research also focuses on gap reduction. Service quality concept was originally discussed in a commercial environment and may require some adaptation to the non-commercial environment of the academic library. A revised service quality measure that developed by P. J. Calvert and P. Hernon(1996) was used for this research. Results showed that service quality measure of this research was reliable(99 service quality items scale's Cronbach Alpha coefficient was 0.983) and was validated by correlation and factor analysis. Therefore service quality measure of this research will be applied positively for academic libraries. And this research showed that the service quality level of sample academic library was inferior to that of the others. The service quality of sample academic library should be improved to meet the customer's needs and expectations immediately.

• Journal of the Korean housing association
• /
• 제19권1호
• /
• pp.9-16
• /
• 2008

This study aims to construct the design competence by means of a topological approach. To this end, the linguistic concept of 'competence and performance' in Chomskian sense is borrowed and applied to the study. The usability of this method is then tested against the sample apartment plans from Gangnam-gu area in Seoul, and it is found that this enabled a middle-ground approach to a more productive grammar that overcomes the limits in Glassie's and Stiny's grammar systems. Through a series of analyses on the sample plans, it could be clarified that there appear classificatory levels in the competence that controls the planning of the building, zoning of the unit, and layout of LDK combination. At the end, it is evaluated that the generative grammar, constructed in this research, is the possible world in designers' minds, and this retrospective remodelling of the architectural competence could illuminate the 'design decision flow' that generates the sample plans.

• Journal of Navigation and Port Research
• /
• 제27권5호
• /
• pp.479-486
• /
• 2003

The concept of “Environmental Stress(ES)” can be used as a useful index when assessing the maritime traffic safety. It is composed of two parts, one due to geographical restriction and another one due to traffic congestion. In this paper, Environmental Stress due to geographical restriction is reviewed Its characteristics are surveyed from the sample calculation results for some hypothetical cases, such as approaching a breakwater, navigating in a long straight channel, and in a long bended channel. Sample calculations are also carried out for the approach channels in Busan and Kwangyang harbor. By using this ES concept, it is expected that objective ana quantitative assessment of safety is possible for various environmental conditions when navigating in a harbor or in a fairway.

• Journal of Engineering Education Research
• /
• 제23권3호
• /
• pp.32-40
• /
• 2020

A new moment of inertia experiment apparatus different from the existing one has been developed, which does not require deformation of a sample in order to fix it to the apparatus. This new experiment apparatus was able to experiment with constant-shaped objects that did not deform the samples, so that it enabled them for conducting an experiment which is close to an ideal rigid model dealt in the general physics course. The new experimental apparatus was easy and accurate in measuring the physical quantity by using the experimental principle of physical pendulum. In the results of the measurement of the moments of inertia of the six samples, all measurements were made to be accurate enough to measure with very small errors within 1%. In addition, it has been found to be useful as an experiment apparatus to understand the concept of the moment of inertia and to prove the formula for moment of inertia. Therefore, if the new moment of inertia experiment apparatus developed in this study is used in students' experiments, it is expected that students will be able to greatly increase their understanding of the concept of moment of inertia.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 한국항해항만학회 2003년도 춘계공동학술대회논문집
• /
• pp.198-205
• /
• 2003

The concept “Environmental Stress(ES)” can be used as a useful index when assessing the maritime traffic safety. It is composed of two parts, one due to geographical restriction and another one due to traffic congestion. In this paper, Environmental Stress due to geographical restriction is reviewed. Its characteristics are surveyed from the sample calculation results for some hypothetical cases, such as approaching a breakwater, navigating in a long straight channel, and in a long bended channel. Sample calculations are also carried out for the approach channels in Busan and Kwangyang harbor. By using this ES concept. it is expected that objective and quantitative assessment of safety is possible for various environmental conditions when navigating in a harbor or in a fairway.

• Korean Journal of Health Education and Promotion
• /
• 제23권2호
• /
• pp.91-107
• /
• 2006

Objectives: The school adjustment problems of the adolescence groups become more aggravated and are on the increase. The objective of this study is to identify the causal relationship of intra-family conflicts, self-concept and school adjustment as health protection behavior. Methods: The study setting is the adolescence groups. Data were collected by self-administered questionnaires from the middle and high school students in Seoul. The study sample consisted of 268 students. Structural Equation Modeling(SEM) analysis was conducted to find the causal relationship of intra-family conflicts, self-concept and school adjustment. Results: This study shows that firstly, the total effects of intra-family conflicts have a negative effect on self-concept(path coefficients=-0.080) and school adjustment(path coefficients=-0.107). And the self-concept factor as an intervening variable are affecting positively on school adjustment(path coefficients=0.411). Secondly, the economic conflicts, personaliy conflicts and social activity conflicts of father and mother among various family conflicts are more highly affecting on self-concept and school adjustment(p<0.01) Conclusions: These results imply that first, communication between parents and students is essential to solve the problems of school adjustment. Especially economic conflicts should be solved to improve the self-concept and school adjustment. second, a variety of programs are available for schools to employ in an effort to provide interventions for students who demonstrate school adjustment. Finally, it is necessary for family, school and all the society members to comprehensively cooperate to solve family conflicts and school adjustment.