• Journal of the Korean Society of Radiology
• /
• v.15 no.5
• /
• pp.731-739
• /
• 2021

This work compared the bright calibration of digital radiation with signal-to-noise ratio and basic spatial resolution according to multi frame to enable effective inspection of welding parts of structures at industrial sites. A total of 130 images were obtained by using a ⁷⁵Se radiation source for flat weld test pieces and segmenting bright calibration and multi frame prior to shooting. The study confirms that the signal-to-noise ratio improves as the number of bright calibrations and the number of multi frame increases. The basic spatial resolution satisfied the baseline for both radiographic images. It was confirmed that the number of signal-to-noise ratio was similar by comparing images taken after installing lead shielding for scattering radiation. Although signal-to-noise ratio increases as multi frame increases, it is believed that good quality digital radiographs can be obtained if appropriate radiographic techniques are devised because exposure time of radiation affects workers' exposure and work efficiency.

• Journal of Digital Convergence
• /
• v.13 no.12
• /
• pp.285-290
• /
• 2015

The purpose of this study is to compare the status of eyesight according to the change of astigmatism axis in myopic astigmatism and to minimize errors in making astigmatic glasses based on accurate optometry and prescription. The subjects were 93 males and females(186 eyes) who have myopic astigmatism without any ocular disease or systemic disease. We performed comparative analysis on the status of visual acuity according to the change of astigmatism axis to 5, 10 and 15 degree in corrected eyesight 1.0. The direct astigmatism was the most common astigmatism type among the 186 eyes. After all subjects were perfectly corrected into 1.0, the change of astigmatism axis affected eyesight; The results suggested that the more change was made in astigmatism axis, the worse their eyesight would become. The main astigmatism type was changed from direct astigmatism to inverse astigmatism as age increased. The change of the astigmatism axis resulted in failing of corrected eyesight. Therefore, the convergence of examination and correction for astigmatism strength and axis is necessary when conducting refraction inspection for astigmatism.

• KIISE Transactions on Computing Practices
• /
• v.21 no.6
• /
• pp.412-417
• /
• 2015

Context-sensitive spelling errors (CSSE) are hard to correct, since they are perfect words when analyzed alone. Determined only by considering the semantic and syntactic relations of their context, CSSEs affect largely the performance of spelling and grammar checkers. The existing Korean Spelling and Grammar Checker (KSGC 4.5) adopts a rule-based method, which uses hand-made correction rules for CSSEs. Using rule-based method, the KSGC 4.5 is designed to obtain the very high precision, which results in the extremely low recall. In this paper, we integrate our previous works that control the CSSE correction rules, in order to improve the recall without sacrificing the precision. In addition to the integration, facultative insertion of adverbs and conjugation suffix of predicates are also considered, as for constraint-loosening linguistic features.

• Annual Conference on Human and Language Technology
• /
• 2014.10a
• /
• pp.18-23
• /
• 2014

한국어 맞춤법 검사기는 전자화된 한국어 텍스트에 나타난 오류어를 검색하여 이를 교정할 대치어를 제시하는 시스템이다. 이때 오류어의 유형은 크게 단순 철자오류와 문맥의존 철자오류로 구분할 수 있다. 이중 문맥의존 철자오류는 어절(word)단위로 봤을 때는 정확하지만, 문맥을 고려하였을 때 오류가 되는 유형으로 교정 난도가 매우 높다. 문맥의존 철자오류의 교정 방법은 크게 규칙을 이용한 방법과 통계 정보에 기반을 둔 방법으로 나뉜다. 이때 규칙을 이용한 방법은 그 특성상 정확도가 매우 높지만, 반대로 재현율이 매우 낮다. 본 논문에서는 본 연구진이 기존에 연구하였던 규칙을 일반화하는 방식에 추가로 조건부 확률을 이용한 통계 방식을 결합하여 정확도를 유지하면서 재현율을 향상시키는 방법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2019.10a
• /
• pp.954-957
• /
• 2019

한국어 맞춤법 검사기는 현재 여러 곳에서 개발하여 서비스를 제공하고 있으며 다양한 목적으로 사용되고 있다. 하지만 이들은 맞춤법이나 띄어쓰기를 검사할 뿐, 존댓말과 같은 높임표현이 잘못 사용되었는지는 검사할 수 없다. 최근에는 맞춤법 검사를 위해 통계적 방식과 딥러닝을 사용하고 있지만, 본 연구에서는 규칙 기반을 활용하여 사용자가 텍스트를 입력하면 잘못된 높임표현을 탐지하여 그에 대한 오류 정보를 제공하고, 올바른 표현으로 교정하는 프로그램을 개발하였다. 구문 분석기를 사용하여 주어-서술어 구조를 파악하고, 형태소 분석기를 활용하여 높임표현을 탐지한 후 격틀사전의 정보를 이용하여 존댓말 오류를 탐지한다. 본 연구는 격식이 있는 문서를 검사할 때나, 한국어 높임말에 익숙하지 않은 외국인들에게 도움이 될 수 있을 것이다.

• Journal of Korean Ophthalmic Optics Society
• /
• v.15 no.1
• /
• pp.25-30
• /
• 2010

Purpose: This study was conducted to estimate the changes of corrected diopter and corrected visual acuity with the change in vertex distance. Also we aimed to provide basic data for refraction test. Methods: Using the trial lens, we measured the corrected diopter and corrected visual acuity after performing binocular balance test. We measured the changes of corrected diopter and corrected visual acuity in change of vertex distance. We analyzed statistical significance and relations between vertex distance and corrected diopter and corrected visual acuity. Results: There was no difference in corrected diopter with the change of vertex distance within -1.00D, but the corrected diopter increased with it over - 1.25D. In particular, the change of diopter was largest when the vertex distance increased 15 mm. At over 11.00D, there was large changes of diopter with the changes of vertex distance at 5 mm, 10 mm and 15 mm. On correlation analysis between the vertex distance and the corrected diopter, there was strong correlation (r=0.999 at 5 mm increase of vertex distance, r=0.982 at 10 mm increase and r=0.957 at 15 mm increase) and also there was significant (p<0.01). At the change of visual acuity in increased of vertex distance, the range of a decrease in visual acuity was large when the changes of vertex distance was largest. On correlation analysis between the vertex distance and the corrected visual acuity, there was strong correlation (r=0.969 at 5 mm increase of vertex distance, r=0.985 at 10 mm increase and r=0.994 at 15 mm increase) and also there was significant (p<0.01). Conclusions: The vertex distance was very important at the refraction test and at wearing spectacle. On correlation analysis between the vertex distance and the corrected diopter, and the corrected visual acuity, there was strong correlation and statistically significant. Therefore, the vertex distance should be kept at the refraction using trial lens, and the best fitting was made not to slipping forward, and so we suggested regular refitting of spectacle and the managing method of spectacle were educated to the spectacle wearers.

• Journal of Korean Ophthalmic Optics Society
• /
• v.13 no.1
• /
• pp.101-105
• /
• 2008

Purpose: In this study we measured the mean value of the distance stereoacutiy for adult subjects and evaluated the variation of the distance stereoacuity according to correction of phoria using the Pola Test E-II of Carl Zeiss. Methods: We investigated the distance stereoacuity for 50 adults (male: 29, female: 21) ranging in age from 19 to 46 years using D6 Circle chart and D8 Line chart in the Pola Test E-II. Results: The mean values of the distance stereoacuity measured on the D6 Circle test and D8 Line test were 159.6 and 149.4 seconds of arc respectively. The mean variations of the distance stereoacuity according to correction of phoria in D6 Circle test were increased 43.2 seconds of arc in exophoria and 51 seconds of arc in esophoria, and those in D8 Line test were increased 42 seconds of arc in exophoria and 70.2 seconds of arc in esophoria. Conclusions: We knew from these results that the distance stereoacuity after prescription of phoria improved more esophoria than exophoria.

• Journal of Korean Ophthalmic Optics Society
• /
• v.20 no.2
• /
• pp.187-193
• /
• 2015

Purpose: This study was aimed to investigate effects of increased breath alcohol concentration (BrAC) which is the standard measurement of alcohol consumption in sobriety test under current laws on visual acuity and values of objective refraction. Methods: For twenty three males in 20s (average age $21.17{\pm}2.19$ years, body mass index (BMI) $22.09{\pm}2.16$) were selected. Distance and near visual test was performed at BrAC of 0%, 0.05% and 0.08%, and objective refraction with open-field auto-refractometer was also performed at different BrAC. Results: As breath alcohol concentration is increased, distance visual acuity was decreased, which was statistically significant, but near visual acuity was not changed. Also, values of objective refraction tended to be increased towards minus as breath alcohol concentration is increased. Conclusions: As breath alcohol concentration is increased, corrected visual acuity is decreased and refractive power is towards minus, it is necessary that visual acuity test and refraction measurement should be conducted under sober condition.

• Annual Conference on Human and Language Technology
• /
• 1995.10a
• /
• pp.86-90
• /
• 1995

본 논문에서는 한 어절 단위에서 다수 어절 단위로 그 고려 영역을 확장한 개선된 철자 검사기를 제시한다. 개선된 철자 검사기는 1) 한 어절 철자 검사 교정부, 2) 언어 규칙 처리부, 3) 문장 부호 규칙 처리부로 구성된다. 한 어절 철자 검사 교정부는 기존의 철자 검사기와 같은 기능을 수행한다. 연어 규칙처리부는 형태소간의 연어 관계를 이용하여 7가지로 유형 분류된 어절 간 오류를 처리한다. 문장 부호 처리부는 문장 부호 자체의 오류와 문장 부호를 참조하여 좌우 어절들의 오류를 검사한다. 현재 256가지의 연이 규칙과 51가지의 문장 부호 규칙이 구축되어 있다. 본 논문에서 제시한 개선된 철자 검사기는 한국어 문체 검사기(Korean Style Checker) 로서 의의를 가지며, 형태소의 연어 정보는 향후 파싱 등의 문장 분석이나 의미 분석에 중요한 자료로 이용될 수 있을 것으로 기대된다.

• Proceedings of the KIEE Conference
• /
• 2002.07b
• /
• pp.915-916
• /
• 2002

최근 산업체 및 국가교정검사기관에서 교정용 표준기급으로 많이 사용하고 있는 Digital Multimeter(HP 3458A)의 수동교정과 불확도 평가후 성적서 발급까지 5시간 정도가 소요된다. 이러한 교정시간을 단축시키고 객관적인 양질의 교정data를 얻을수 있는 교정자동화 프로그램을 개발하였다. 이 프로그램은 Labview를 이용하여 작성하였고 교정부터 불확도평가후 성적서 발급까지 자동적으로 1시간내에 수행이 된다. 또한 기존의 수동교정에 의한 결과와 비교했을 때 불화도 범위 내에서 동일한 결과를 얻었다.