• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.45-48
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• 2019

Detection of crosswalk is an important issue for the blind to walk without the help of others. There is a braille block on the sidewalk, which helps the blind to walk. On the other hand, crosswalk is more dangerous due to the moving vehicles. However, there is no appropriate means to induce the blind. In this paper, we propose a method to detect crosswalk in front of a blind and estimate its direction using an image sensor. We adopt multi-ROIs and make their binary versions. In order to determine whether it is a crosswalk, two features are extracted; one is the number of crossing in the binary image and the other is the ratio of white area. We can also estimate the direction of the crosswalk through the slope of the projection data. We evaluated the performance using experimental dataset and the proposed algorithm showed 80% accuracy of detection.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.381.1-381.1
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• 2016

분석 방법의 간편함과 용이함의 장점은 물론, 시료 전처리 과정이 적어 시료물질의 임의 파괴나 훼손을 방지한다는 이유에서 최근 10년 간 많은 연구가 이루어지고 있는 대기압 질량분석 기술은 기압차이가 없는 대기압 분위기에서 질량분석이 이루어지기 때문에 시료를 질량분석기 입구 바로 앞에 스테이지를 설치하고서 시료를 이온화하는 경우가 대부분이다. 이 때문에 균질하지 않은 시료의 관심 영역을 모니터링하면서 질량분석을 하기에는 어려움이 있으며, 공간 정보를 추가한 질량분석 이미징에 한계가 있었다. 이에 본 연구팀은 질량분석기 입구에 챔버와 보조 펌프를 장착하여 강제로 기체 흐름 일으켜 시료로부터 발생한 이온을 질량분석기 입구로 유도하여, 원거리에서 시료를 이온화해도 질량분석기 입구까지 이온을 성공적으로 전달시키는 방법을 제안한다. 이를 이용하면 분석하고자 하는 시료를 현미경 스테이지 위에 위치시켜 분석하고자하는 부분을 현미경으로 확인하면서 질량분석을 할 수 있으며, 나아가 대기압 질량 분석 이미징 기술을 구현할 수 있다. 대기압 탈착/이온화원은시료에 열적 손상이 없는 조건으로 시편의 이온화 및 탈착 과정이 이루어지게 하기 위해 저온 대기압 헬륨 플라즈마 젯과 펨토초 레이저를 결합하여 대기압 이온화원을 제작하였다. 이온 전달관은 1/4" (6.35 mm) 외경의 60 cm 길이의 스테인리스 스틸관을 사용하여 질량분석기에서 약 60 cm 떨어진 현미경 위의 시료의 질량분석이 가능하게 했다. 보조 펌프의 계기압과 저온 대기압 헬륨 플라즈마 젯의 헬륨 기체의 유속을 변화시키면서 시료인 PDMS (polydimethylsiloxane) 의 질량 스펙트럼 (m/z 270.314) 세기를 관찰하여 최적의 이온 전달 조건을 찾았다. 추가로 현미경 스테이지에 정밀 2-D 자동 스캐닝 스테이지를 장착하여 질량분석 정보에 공간 정보를 더할 수 있는 질량분석 이미징 기술 방법을 개발하여 생체 시편의 질량분석 이미징을 얻었다.

• Journal of Oral Medicine and Pain
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• v.20 no.2
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• pp.283-289
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• 1995

레이저가 의학영역에서 사용된 후 구강내 연조직과 경조직 병소에 대한 임상적 적용에 관한 관심이 커져왔다. 레이저가 조사되는 부위에서는 대부분 연기가 발생한다. 이 경우 병원체가 존재하는 병소에 대한 레이저치료시 발생되는 연기속에 병원체가 포함되어 이Tekas 환자와 술자는 이의 흡입가능성이 크므로 균혈증 및 상기도나 호흡계의 의원성 감염이 유발될 수 있다. 저자는 레이저치료시 발생되는 연기속에 병원체가 포함되어 있는지의 여부를 규명하기위해 각각 10개의 실험군에 통기성 미생물인 Escherichia coli(E.coli)가 배양된 brain geart infusion (BHI) 배지와 E.coli 가 존재하는 치근단 병소를 실험적으로 만든 후 각각 pulsed Nd:YAG 레이저를 조사해 연기를 채취, 배양, 분석하여 다음과 같은 결과를 얻었다. 1. Pulsed Nd:YAG 레이저를 E. colir 배양된 agar substrate 와 실험적으로 만들어진 치근단부위의 E.coli 현탁액에 조사시 발생된 연기에서 처음 접종된 것과 같은 E.coli가 검출되었다. 2. 감염병소에 pulsed Nd:YAG 레이저를 조사시 발생되는 연기의 유해효과로부터 환자와 술자 및 보조자의 보호를 위해 효과적인 흡입기를 사용이 권장된다.

• Proceedings of the Korean Vacuum Society Conference
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• 1999.07a
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• pp.59-59
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• 1999

DLC(diamond-like carbon)필름은 다이아몬드와 유사한 강도, 낮은 마차계수, 높은 Optical band gap, NEA(negative electron affinity)등의 우수한 특성을 가지고 있어, 내마모 코팅이나 정보저장 매체의 윤활 코팅, FED(field emission display)의 전계방출소자등 다양한 분야에의 응용이 연구되고 있다. DLC 필름은 PECVD(plasma enhanced chemical vapor deposition), IBAD(ion beam assisted deposition), Laser ablation, Cathodic vacuum arc등의 process를 이용하여 증착되고 있다. 특히 이러한 필름의 물성은 입사되는 이온의 에너지에 의해 좌우되는데, Lifshitz 등의 연구에 의하여 hyperthermal species를 이용한 DLC 필름의 성장은 초기에 subsurface로의 shallow implantation이 일어난 후 높은 sp3 fraction을 갖는 필름이 연속적으로 성장한다는 subplantation model이 제시 되었다. 본 연구에서는 기판과 subplantation 영역이 이후 계속하여 증착되는 순수 DLC 필름의 특성 변호에 미치는 영향에 대하여 관심을 가지고 실험을 행하였다. 본 실험에서는 상기 제시되어 있는 방법보다도 더욱 정확하고도 독립적으로 탄소 음이온의 에너지와 flux를 조절할 수 있는 Cs+ ion beam sputtering system을 이용하여 탄소 음이온의 에너지를 40eV에서 200eV까지 변화시키며 필름을 증착하였다. Si(100) 웨이퍼를 기판으로 사용하였고 증착 압력은 5$\times$10-7torr 였으며 인위적인 기판의 가열은 하지 않았다. 또한 Ion beam deposited DLC film의 growth process를 연구하기 위하여 200eV의 탄소 음이온을 시간(증착두께)을 변수로 하여 증착하였고, 이 때에는 Kaufman type의 gas ion beam을 이용하여 500eV의 Ar+ ion으로 pre-sputering을 행하였다. 탄소 음이온의 에너지와 증착두께에 따라 증착된 film 내의 sp3/sp2 ratio 의 변화를 XPS plasmon loss 와 Raman spectra를 이용하여 분석하였다. 또한 증착두께에 따른 interlayer의 결합상태를 관찰하기 위하여 AES와 XPS 분석을 보조로 행하였다.

• Journal of Korea Multimedia Society
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• v.15 no.8
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• pp.996-1003
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• 2012

We present a nearby vehicle detection method in the adjacent lane using in-vehicle front view camera. Nearby vehicles in adjacent lanes show various appearances according to their relative positions to the host vehicle. Therefore, most conventional methods use motion information for detecting nearby vehicles in adjacent lanes. However, these methods can only detect overtaking vehicles which have faster speed than the host vehicle. To solve this problem, we use the feature of regions where nearby vehicle can appear. Consequently, our method cannot only detect nearby overtaking vehicles but also stationary and same speed vehicles in adjacent lanes. In our experiment, we validated our method through various whether, road conditions and real-time implementation.

• The Journal of the Korea Contents Association
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• v.21 no.11
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• pp.436-449
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• 2021

The purpose of this study is to examine the characteristics of the Reformation Calvin undertook in Geneva and see what efficient functions Christianity can afford to reveal its value in urban settings today. Calvin's Reformation provided a clear place and role for the Church in the public domain. In addition, Calvin's process of religious reform has always been followed by interest and welfare practices for the socially disadvantaged, such as the poor and women. In this understanding, the study presented the following applications that modern churches can practice in urban settings today: First, the church should be able to clearly understand the diversity, liquidity, and dynamics of the urban environment and make changes through various situational applications supported by the Bible. Second, the church's missional approach should shift from a believing-belonging process to a sense of belonging-believing. Third, the transition from a familiar traditional church to a new social reality is necessary, and efforts are needed to clearly understand the interests and atmosphere of community communities and keep pace with them. And finally, modern churches need to maintain new ecological sensitivity than ever before.

• Journal of the Korean Society of Radiology
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• v.9 no.4
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• pp.227-234
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• 2015

In this paper, we studied possibility about application for CAD on diffuse liver disease through pixel texture analysis parameters(average gray level, skewness, entropy) which based statistical property brightness histogram and image analysis using brightness difference liver and kidney parenchyma. The experiment was set by ROI ($50{\times}50$ pixels) on liver ultrasound images.(non specific, fatty liver, liver cirrhosis) then, evaluated disease recognition rates using 4 types pixel texture analysis parameters and brightness gap liver and kidney parenchyma. As a results, disease recognition rates which contained average brightness, skewness, uniformity, entropy was scored 100%~96%, they were high. In brightness gap between liver and kidney parenchyma, non specific was $-1.129{\pm}12.410$ fatty liver was $33.182{\pm}11.826$, these were shown significantly difference, but liver cirrhosis was $-1.668{\pm}10.081$, that was somewhat small difference with non specific case. Consequently, pixel texture analysis parameter which scored high disease recognition rates and CAD which used brightness difference of parenchyma are very useful for detecting diffuse liver disease as well as these are possible to use clinical technique and minimize reading miss. Also, it helps to suggest correct diagnose and treatment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.1
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• pp.507-515
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• 2015

This paper suggests 6 cases of TFA parameters algorithm(Mean, VA, RS, SKEW, UN, EN) to search for the detection of recognition rates regarding breast disease using CAD on ultrasound images. Of the patients who visited a university hospital in Busan city from August 2013 to January 2014, 90 cases of breast ultrasound images based on the findings in breast US and pathology were selected. $50{\times}50$ pixel size ROI was selected from the breast US images. After pre-processing histogram equalization of the acquired test images(negative, benign, malignancy), we calculated results of TFA algorithm using MATLAB. As a result, in the TFA parameters suggested, the disease recognition rates for negative and malignancy was as high as 100%, and negative and benign was approximately 83~96% for the Mean, SKEW, UN, and EN. Therefore, there is the possibility of auto diagnosis as a pre-processing step for a screening test on breast disease. A additional study of the suggested algorithm and the responsibility and reproducibility for various clinical cases will determine the practical CAD and it might be possible to apply this technique to range of ultrasound images.

• Communications of Mathematical Education
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• v.38 no.2
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• pp.263-286
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• 2024

With the introduction of AI digital textbooks, interest in the use of technology tools in mathematics education is increasing. Technology tools have the advantage of visualizing mathematical concepts and discovering mathematical principles through experimentation and inquiry. The 2015 revised mathematics curriculum in Korea already mentions the use of technology tools, and accordingly, various teaching and learning activities using technology tools are presented in mathematics textbooks. However, there is still a lack of systematic analysis on the types and utilization methods of technology tools presented in textbooks. Therefore, this study analyzed the current status of the use of technology tools presented in high school mathematics textbooks based on the 2015 revised curriculum. To this end, the types of technology tools presented in mathematics textbooks were categorized, and the utilization ratio of each category was investigated. In addition, the utilization patterns of technology tools were analyzed by subject and content area, and the utilization ratio of technology tools according to the type of teaching and learning activities was examined. The results showed that technology tools were used in various types and ratios according to the subject and content area. In particular, technology tools in the symbol-manipulation graphing software category accounted for 58% of the total usage cases, showing the highest proportion. By subject, the use of symbol-manipulation graphing software was prominent in subjects dealing with the analysis area, while the use of dynamic geometry software was relatively high in the geometry area. In terms of teaching and learning activity types, the utilization ratio of auxiliary tool type (49%) and intended inquiry induction type (37%) was high. The results of this study show that technology tools play various roles in mathematics textbooks and provide useful implications for improving mathematics teaching and learning methods using technology tools in the future. Furthermore, it can contribute to the establishment of educational policies related to AI digital textbooks and the development of teacher training programs.

• The Korean Journal of Nuclear Medicine Technology
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• v.26 no.1
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• pp.33-37
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• 2022

Purpose ¹⁸F-Florbetaben (FBB) Readings are made by visually comparing the signal strengths of gray matter and white matter. We intend to evaluate the usefulness of image analysis by comparing quantified image analysis with readout. Materials and Methods Based on the reading results, 100 patients were divided into a negative scan and a positive scan, and 300 MBq of FBB was injected, and images were taken 90 minutes later for 20 minutes. The equipment was a Discovery 600 (GE Healthcare, MI, USA). Four regions of interest (lateral temporal lobes, frontal lobes, posterior cingulate & precuneus, and parietal lobes) were established based on the amyloid reading standard provided by the manufacturer. For image analysis, SUVratio (SUVr) was calculated by dividing each SUVmean by the cerebellum, and the average SUVr in the entire area was performed. Statistical analysis analyzed the cutoff derivation through ROC Curve, the difference between groups in Independent sample t-test, and the degree of agreement with the reading result through Kappa test. Results The average SUVr cutoff in the entire area was 1.23. Concordance with the read results using cutoff was 95/100 (95%) for negative and 92/100 (92%) for positive. As a result of the t-test, there was a statistically significant difference between the groups (P < 0.05), and the Kappa statistical result showed a high degree of agreement with 0.867 (P < 0.05). Conclusion The results of image analysis were statistically significant and showed a high degree of agreement with the reading results. In addition, FBB image analysis can be viewed by 3D mapping the area where amyloid is accumulated, location estimation is possible, and quantitative analysis results can be viewed in detail. If quantified FBB image analysis is used as an auxiliary indicator, it is thought to be helpful in reading.