• Journal of Technologic Dentistry
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• v.20 no.1
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• pp.13-19
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• 1998

This study was performed to identify the current problem of The National Qualification Examination for Dental Technician and to provide suggestion for improvement of The National Qualification Examination System. This study was based on the questionaries answered by the professors in the department of dental technology of college and the members of Korea dental technician's society. The result could be summarized in the following. 1. The examination should be held not only in Seoul but in other areas simultaneously. 2. Prepartation of The National Qualification Examination should be entrusted to a committee composed of selected members of The Korea Dental Technician Association and selected members of professors in the department of dental technology. 3. The carrving practical examination should be continued and the method of grading should be change to ensure fairness, objectivity and balance. Specially colored wax can be used to prevent cheating in test. 4. The examination on the subject of "The Introduction Dental Anatomy" should be different for dental technicians and dental hygienists. And the subjects need to be divided into "Dental Morphology" and "Oral Anatomy".

• 한국방재학회:학술대회논문집
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• 2008.02a
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• pp.261-263
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• 2008

Determining the most likelihood earthquake scenario in one region is very important for performing an earthquake-resistant design. The most likelihood earthquake scenario can be selected by performing deaggregation, who classifies earthquakes that occur ground motion exceeding a specific acceleration as each distance and each earthquake magnitude. If earthquakes are classified, the most likelihood earthquake scenario can be selected. Earthquake hazard analysis method that have to be performed before deaggregation follows the method that Ministry of Construction & Transportation presented. As a result of performing deaggregation at longitude 127.35 and latitude 34.7, presentable seismic ground motion scenarios can be selected at each recurrence period.

• Journal of Korean Institute of Industrial Engineers
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• v.19 no.4
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• pp.49-70
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• 1993

The purpose of this study was to develop a semigenerative process planning system for the turning processes required for rotational parts. The system developed in this study showed three major roles for a given part : selection of appropriate turning processes, scheduling of selected processes, and selection of appropriate tools to be used for selected processes. Four information files and six modules were developed to produce a process plan. When geometric features, dimension, tolerance, material types, and surface finish data are inputted to the system, optimal processes, processing sequences, selected tools, and machining costs are to be produced as a process plan.

• Korean Journal of Health Education and Promotion
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• v.22 no.3
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• pp.83-95
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• 2005

Objectives: The aim of this study was to assess the quality of the information and characteristics associated with information packaging, and develop suggestions for how this web site might be improved. Methods: The 50 sites were selected for evaluation. Inclusion criteria for evaluation were the purpose and the popularity of the sites. Two kinds of evaluation tool were employed for the analysis: one that evaluate the quality of information and the design of the web sites, and another that evaluate the covered contents. A scoring system allowed the sites point on yes/no basis on the evaluation items. The association between quality of the web sites on sexuality education and their site characteristics were assessed using ANOVA. Conclusions: Major conclusions were as follows. First, the scope and currency of the selected web sites were found to be appropriate. Second, the authority of the information was found to be the most serious problem of the selected sites. Third, the category of sexual behavior found to be the most frequently mentioned and sexual health was the second. The least mentioned category was personal skills. Finally, sites operated by private organization were found to have more accurate information and better design feature than those operated by public organization and/or individual.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.9
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• pp.807-817
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• 2012

An optical payload needs to be validated its image performance after launched into orbit. The image performance was validated by observing star because ground site contains uncertainties caused by atmosphere, time of the year, and weather. Time Delayed and Integration(TDI) technique, which is mostly used to observe the ground, is going to be used to observe the selected stars. A satellite attitude scenario was also developed to observe the selected stars. The scenario is created to enable TDI to operate. Rotation angles of optical payload are determined in order for the selected stars to properly be passed at a desired angular velocity about rotation axis. The result of this research can be utilized to validate the quality of optical payload of a satellite in orbit. In addition, a quaternion for pointing selected stars is calculated minimizing the path from a given arbitrary attitude of satellite.

• Journal of Korean Society for Quality Management
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• v.28 no.3
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• pp.124-132
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• 2000

A selected subject and a standardized scoring system were newly enforced at college entrance examination from 1999. A selected subject system means each student can select one subject in addition to common subject in the field of mathematical research II and a standardized scoring system means we standardize the score of each field as mean 50 and standard deviation 10 in order to adjust the degree of difficulty between fields. In the field of mathematical research II, there may exist not only difference of the degree of difficulty but also that of general studying ability between groups of selected subjects. So when we standardize score, we have to consider them. So far a linear equating which is a parametric method and an equi-percentile equating which is a nonparametric method have been published, but both of them supposed that the general studying ability between groups was equal. So in this paper an adjusted linear and percentile equating method which seems to be adequate to our entrance examination is suggested and is investigated by computer simulation.

• Journal of the Korea Society of Computer and Information
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• v.27 no.5
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• pp.77-84
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• 2022

In this paper, we propose a novel unsupervised feature selection method. Conventional unsupervised feature selection method defines virtual label and uses a regression analysis that projects the given data to this label. However, since virtual labels are generated from data, they can be formed similarly in the space. Thus, in the conventional method, the features can be selected in only restricted space. To solve this problem, in this paper, features are selected using orthogonal projections and low-rank approximations. To solve this problem, in this paper, a virtual label is projected to orthogonal space and the given data set is also projected to this space. Through this process, effective features can be selected. In addition, projection matrix is restricted low-rank to allow more effective features to be selected in low-dimensional space. To achieve these objectives, a cost function is designed and an efficient optimization method is proposed. Experimental results for six data sets demonstrate that the proposed method outperforms existing conventional unsupervised feature selection methods in most cases.

• Journal of the Korean Applied Science and Technology
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• v.4 no.1
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• pp.23-36
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• 1987

Plasma levels of lipids were observed in vegetarians and non-vegetarians in order compare the values between the two groups with different dietary habits, and among different age groups. All 162 vegetarians and 95 non-vegetarians were selected for this study. In detail, male vegetarians subjects were devided into three groups according to their ages, 20's, 30's and 40's. And three control groups were also selected at matching basis. Two groups each were selected for female subjects in their 20's and 40's. All ten groups were adopted and the lipids levels were compared appropriately. Dietary habits of vegetarians were shown to be fairly strict. They consumed almost no animal foods and depended largely upon plant foods with emphasis on unrefined cereals and legumes. on the other hand, non-vegetarians consumed meats, fish egg and milk frequently. Most of plasma lipid levels measured were found to be lower in vegetarians and tended to be higher for the higher age groups of both vegetarians and non-vegetarians. Although the lipids levels of non-vegetarians were higher than the ones for vegetarians, the levels were within optimal range, and it can be concluded in this study that the plasma lipid levels of non-vegetarians under Korean dietary pattern are quite acceptable.

• Publications of The Korean Astronomical Society
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• v.27 no.4
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• pp.343-344
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• 2012

We present the first measurement of the angular two-point correlation function for AKARI $90{\mu}m$ point sources, detected outside of the Milky Way plane and selected as candidates for extragalactic sources. This is the first measurement of the large-scale angular clustering of galaxies selected in the far-infrared after IRAS. We find a positive clustering signal in both hemispheres extending up to ~ 40 degrees, without any significant fluctuations at larger scales. The observed correlation function is well fitted by a power law function. However, southern galaxies seem to be more strongly clustered than northern ones and the difference is statistically significant. The reason for this difference - technical or physical - is still to be found.

• Transactions of the Korean Society of Automotive Engineers
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• v.13 no.6
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• pp.1-6
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• 2005

In domestic replacement tire market, imported tires are increasing condinuously. Because there is no institute officially investigating tire safety and performance, domestic drivers can be exposed to defective tires with no regulations. In this study we performed investigation of replacement tire market status and amount of imported tires. Over $90\%$ of imported tires are for passenger car and the number of total imported tires is increasing in recent years. Low price tires imported from Southeast Asia and China are selected to evaluate quality level. Basic inspection, indoor test, outdoor test, material test are conducted to evaluate the selected tires and compared with tires of domestic maker. From test results quality level of the selected tires could be found.