• Journal of the korean academy of Pediatric Dentistry
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• v.26 no.1
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• pp.119-125
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• 1999

Conventional interproximal stripping using abrasive strips is normally limited to the anterior teeth. The strips must be forced between the contact points of the teeth creating patient discomfort and the risk of cutting gingival tissue. Air-rotor stripping(ARS) with Essix anterior anchor enables the clinician to remove a precise amount of interproximal enamel to create space, primarily in the buccal quadrants, for aligning or retracting teeth. In selected cases, ARS can resolve significant differences in ratios of tooth site to arch length, and the technique can become an alternative to extraction or expansion. ARS can create substantially more space than that is usually obtained by conventional interproximal stripping, and it can be done at any time during treatment without discomfort to the patient and without adversely affecting the function of the dentition, interocclusal relations, or tooth form.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.2
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• pp.835-839
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• 2013

In this paper, We operate at a relatively low BER or using forward error control coding techniques on ways to increase the capacity of optical communication systems research. Coding gain is defined as the ratio of the probability of the coded signal and coding of error signal. Coding gain is increased, partly because of the period, to reduce the value of the optimal coding of the signal error probability decreases because of the effective bit binary symbol duration is longer than can be ignored. Transmission capacity on the coding gain for various code rates, which show the extent of up to 75Gb/s transmission capacity to get through it was confirmed that these coding techniques.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.3
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• pp.331-338
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• 2016

In this paper, we propose a GRNN(: Generalized Regression Neural Network) algorithms for new eyes and face recognition identification system to solve the points that need corrective action in accordance with the existing problems of facial movements gaze upon it difficult to identify the user and. Using a Kalman filter structural information elements of a face feature to determine the authenticity of the face was estimated future location using the location information of the current head and the treatment time is relatively fast horizontal and vertical elements of the face using a histogram analysis the detected. And the light obtained by configuring the infrared illuminator pupil effects in real-time detection of the pupil, the pupil tracking was - to extract the text print vector.

• Journal of the Korean School Mathematics Society
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• v.16 no.1
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• pp.141-155
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• 2013

Process to translate into other forms in the form of expression for function is important in the development of functional thinking. Also it should be emphasized on the teaching of the function. This study will identify the translation ability of functional expressions and errors in the process to translate. The purpose of this study is to suggest important implications for the teaching and learning of function. To do this, we lead high school students perform the task to examine the translation ability. Then we compute a percentage of correct answers for each question and analyze the types of errors and their causes.

• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.430-432
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• 2008

학교와 같이 대단위 교육을 수행하는 곳에서 필수적으로 사용되는 것은 강의실 의자이다. 소비자 중심적인 시대적 변화에 따라 많은 제품들이 다양한 소비자의 요구가 반영되어 출시되고 있으나, 강의실 의자는 아직 이러한 요구가 받아들여지지 않거나 무시되고 있다. 강의실에서 학생들이 가장 불편해 하는것은 자신의 신체치수에 적합하지 않는 강의실 의자이다. 따라서 본 연구에서는 다양한 신체치수를 반영할 수 있는 가변형 강의실용 의자를 개발하고자 한다. 신체치수는 앉은키와 체형을 고려하여 앉고 일어서는데 불편함이 없도록 책상 접힘과 의자와의 거리조절이 가능하고, 사람의 신장에 따라 높낮이 조절이 가능한 구조로 설계하여 기존의 평균책상 사이즈에 구애받지 않고 사용자의 신체구조에 따라 자유롭게 조절시켜 장시간 의자에 앉아 있을 때 불편함을 개선하고 불균형한 자세 등을 교정시켜 줌으로써, 학업 시 바른 자세를 유도하며 학업능률을 향상시킬 것으로 기대한다.

• Journal of Korean Elementary Science Education
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• v.18 no.2
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• pp.145-151
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• 1999

There is an experiment in the elementary science textbook which a burning candle hold upright in a water tank and a beaker is converted over the burning candle, the candle flame goes out and the water rises into the beaker. Some reference books including teachers' guide for the elementary school teachers explain the reason why water rises that oxygen is "used up", so water rises the same volume of consumed oxygen into the beaker. But this explanation is only partially correct. In this study, discrepancies of the explanation that oxygen is "used up" are analyzed. Water rises by two major reasons. One is that water can rise to the level about l/3 of the volume of consumed oxygen. The other is that the beaker is converted over the burning candle which produces hot CO2 and water vapor, and the candle's flame heats the air around it to expand, after the candle flame goes out, the air in the beaker cools and water vapor changes to liquid water, so, air pressure in the beaker is reduced, and the water is pushed into the beaker by great air pressure outside. 1 demonstrate a inquiry teaching method of the candle experiment.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.37 no.5
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• pp.17-24
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• 2000

Complex permittivity of dry sand is measured by using an open-ended coaxial probe, which was self-designed and manufactured. As a simple calibration scheme of the probe, the phase difference between the measured and the calculated reflection coefficients of pure water is subtracted from the phase of the measured reflection coefficient for dry sand. And then the complex permittivity of dry sand is reconstructed by applying its measured reflection coefficient into an improved imaginary transmission-line model. The accuracy of our measurement scheme is verified by showing that its reconstructed complex permittivity approaches the precise value of dry sand.

• Phonetics and Speech Sciences
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• v.2 no.4
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• pp.51-58
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• 2010

English vowels play an important role in the daily communication between Korean students and international visitors. However, many Korean students still have difficulty producing them distinctively. Vowels vary according to shapes of oral and pharyngeal cavities, which are mainly determined by the degree of jaw opening and tongue position. Yang (2008a) proposed a simplified chart of English and Korean vowels for an educational purpose. He also suggested to use wooden chopsticks to secure distinguishable jaw openings. The purpose of this study is to tap whether wooden chopsticks can be applicable to a method for correcting English vowel pronunciation. Twelve male and female students participated in the recordings of eight /hVd/ words followed by additional recordings with wooden chopsticks between upper and lower teeth. The first and second formant trajectories of both natural and controlled vowel productions were obtained and compared at six equidistant measurement points using Praat. Results showed that the formant values of natural vowel productions were comparable to those of controlled productions. Vowels with similar formant trajectories of male students were separated with the aid of chopsticks. The width of each chopstick could be controlled similarly in the experiment. The author concludes that wooden chopsticks can be useful to correct vowel pronunciation. Further studies are desirable for native speakers to make perceptual evaluations of controlled vowel productions by nonnative speakers.

• The Journal of the Korea Contents Association
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• v.9 no.6
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• pp.309-324
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• 2009

The purpose of this study, decision factors about network characteristics among Social Welfare service organizations and individuals are defined to obtain proper empirical bases for building systematic human service network in the local community bases. As results of analysis, Firstly The order of density is shown as follows the information exchange, the client refer, the resource exchange. Secondly The result about the analysis whether the level factor of the organizational members and organizations affect positively is summarized as follows.it is shown that the number of meeting, organizational type, the prior experience of networking affect positively.

• Journal of the Korean Society for Library and Information Science
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• v.53 no.3
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• pp.101-120
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• 2019

The cognition of Research Record Management (RRM) scholars about research framework is important as a pre-condition for future Linked Open Data (LOD). Researchers will be directly engaged to the research data-process with Cloud Computing Data-Infra, which is considered as a Nation-wide R&D Data Projects. The purpose of this paper is to diagnose researcher's cognition of research framework and to provide some guidance of finding a new meaning of the structural requirements of resarch record.