• 한국멀티미디어학회논문지
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• 제16권3호
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• pp.388-398
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• 2013

본 연구에서는 '기업의 문화예술 지원 동기에 따라 기업의 사회 공헌 이미지에 대한 인식은 차이를 보일 것'이라는 연구가설을 검증하였다. 전국의 주요 공연장 및 미술관을 중심으로 310부의 설문지를 배부하고 그 결과를 구조방정식 모형을 통해 검증한 결과, 고객 가치 동기가 기업의 사회 공헌 이미지 평가에 정적(+)인 영향을 주고, 기업 가치 동기가 기업의 사회 공헌 이미지 평가에 부적(-)인 영향 주는 것을 알 수 있다. CSR과 CSV를 포함한 기업의 사회공헌 동기의 유형에 따라 소비자가 인식하는 기업의 평가는 어떻게 달라질 것인지를 검증하기 위해 집단 간 비교를 실시하였다. CSR 집단에 비해 CSV 집단에서 고객 가치 동기가 기업 이미지에 미치는 영향력이 큰 것을 알 수 있다. 그리고, CSV 집단에 비해 CSR 집단에서 기업 가치 동기가 기업 이미지에 미치는 영향력이 큰 것을 알 수 있다.

• 한국콘텐츠학회논문지
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• 제21권7호
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• pp.206-221
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• 2021

기업을 향한 사회적 책임 요구는 갈수록 높아지고 있다. 기업은 제품, 서비스 품질을 통한 경쟁력 확보 노력만으로는 충성고객을 확보할 수 없다. 고객이 요구하는 사회적 기대를 충족시켜 주기 위해서 적극적으로 행동해야 한다. 이러한 배경하에 본 연구는 기업의 사회적 책임이 기업의 브랜드 성과로 어떻게 연결되는지, 그리고 소비자 개인의 특성에 따른 차이를 살펴보기 위해서 기업의 사회적 책임에 대한 평소의 관심이 어떻게 상호작용하는지에 대한 효과를 검증하기 위한 설문조사를 진행하였다. 연구결과 기업브랜드 이미지와 호감도 형성에 있어서 법률적 책임과 경제적 책임이 주요한 영향을 미치는 것으로 확인할 수 있었다. 윤리적 책임의 경우는 신뢰 이미지 형성에서 중요한 역할을 하였지만, 성과적 이미지, 혁신 이미지를 형성에는 오히려 부정적 영향을 미치는 것으로 나타났다. 기업의 사회적 책임이 기업브랜드 성과에 미치는 영향에 있어서 사회적 책임에 대한 평소 관심은 조절 효과로서의 영향을 미치지 못한 것으로 나타났다.

• 대한방사선기술학회지:방사선기술과학
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• 제44권4호
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• pp.327-333
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• 2021

Magnetic resonance imaging(MRI) uses strong magnetic field to image the cross-section of human body and has excellent image quality with no risk of radiation exposure. Because of above-mentioned advantages, MRI has been widely used in clinical fields. However, the noise generated in MRI degrades the quality of medical images and has a negative effect on quick and accurate diagnosis. In particular, examining a object with a detailed structure such as brain, image quality degradation becomes a problem for diagnosis. Therefore, in this study, we acquired T2 weighted 3D data of multiple sclerosis disease using BrainWeb simulation program, and used quantitative evaluation factors to find appropriate slice thickness among 1, 3, 5, and 7 mm. Coefficient of variation and contrast to noise ratio were calculated to evaluate the noise level, and root mean square error and peak signal to noise ratio were used to evaluate the similarity with the reference image. As a result, the noise level decreased as the slice thickness increased, while the similarity decreased after 5 mm. In conclusion, as the slice thickness increases, the noise is reduced and the image quality is improved. However, since the edge signal is lost due to overlapped signal, it is considered that selecting appropriate slice thickness is necessary.

• Imaging Science in Dentistry
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• 제52권3호
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• pp.283-288
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• 2022

Purpose: This study was conducted to measure the radiation exposure and image quality of various cone-beam computed tomography (CBCT) machines under common clinical conditions and to analyze the correlation between them. Materials and Methods: Seven CBCT machines used frequently in clinical practice were selected. Because each machine has various sizes of fields of view (FOVs), 1 large FOV and 1 small FOV were selected for each machine. Radiation exposure was measured using a dose-area product (DAP) meter. The quality of the CBCT images was analyzed using 8 image quality parameters obtained using a dental volume tomography phantom. For statistical analysis, regression analysis using a generalized linear model was used. Results: Polymethyl-methacrylate (PMMA) noise and modulation transfer function (MTF) 10% showed statistically significant correlations with DAP values, presenting positive and negative correlations, respectively (P<0.05). Image quality parameters other than PMMA noise and MTF 10% did not demonstrate statistically significant correlations with DAP values. Conclusion: As radiation exposure and image quality are not proportionally related in clinically used equipment, it is necessary to evaluate and monitor radiation exposure and image quality separately.

• 한국터널지하공간학회 논문집
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• 제23권6호
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• pp.549-558
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• 2021

터널과 지하시설물을 비롯한 콘크리트 토목구조물을 안전하게 관리하려면 균열 발생 여부를 정기적인 점검을 통해 알아내야 한다. 터널의 콘크리트 라이닝 표면에 발생한 균열의 위치와 형태를 검사하는 일은 주로 고소작업차를 투입하여 이루어진다. 이러한 작업은 차로를 통제한 채 이루어지므로 교통 체증을 일으키며, 점검 종사자가 위험한 환경에 노출되며, 매번 같은 종사자가 같은 터널의 같은 부위를 조사하기 어려우므로 검사 결과의 일관성이 저해된다. 본 연구는 기존 터널 영상 취득 시스템을 대상으로 딥러닝 기술을 적용해 터널 내 콘크리트 라이닝의 균열을 자동으로 탐지하는 방법을 다음과 같이 제시한다. 구체적으로는 의미론적 분할(semantic segmentation)을 수행하는 딥러닝 모델을 공개 데이터셋으로 학습시키고, 터널 영상 취득 시스템으로 취득한 데이터셋을 딥러닝 모델에 입력했을 때 성능을 알아본다. 첫 번째, 공개 데이터셋을 전부 학습시켰을 경우, 두 번째, 공개 데이터셋 중 기존 터널 영상 취득 시스템 데이터셋과 관련성이 높은 데이터셋만 선택하여 학습시켰을 경우, 마지막으로 관련성이 높은 데이터셋과 균열이 없는 영상(negative example)을 선택하여 학습시켰을 경우에 대하여 성능을 비교하여 효율적인 모델 학습 방안을 모색한다. 그 결과 공개 데이터셋에서 관련성이 높은 영상과 균열이 없는 영상을 골라 학습시켰을 경우의 성능이 가장 좋았다. 향후 딥러닝 알고리즘을 터널 영상 취득 시스템에 적용할 때 효율적인 모델 학습 방안을 수립하는데 기여할 것으로 기대한다.

• 한국치위생학회지
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• 제10권5호
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• pp.831-839
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• 2010

Objectives : The purpose of this study was to examine dental hygiene students' image of dental hygienist and factors affecting the image of dental hygienist in an effort to provide some information useful for dental hygiene education. It's basically meant to recreate the image of dental hygienist as a professional. Methods : The subjects in this study were 310 sophomores and seniors who ere selected by convenience sampling from three different three-year-course colleges located in Gyeonggi Province, Chungcheong Province and Gwangju. After a survey was conducted, the answer sheets from 277 respondents were analyzed except for 33 incomplete ones. The collected data were analyzed with a SPSSWIN 17.0 program, and statistical data on frequency and percentage were obtained to find out the general characteristics of the subjects, and another statistical data on mean and standard deviation for each item were acquired to check their image of dental hygienist. Besides, t-test, ANOVA and Kruscal-Wallis test, one of nonparametric test, were utilized to look for connections between their general characteristics and image of dental hygienist. Results : 1. They gave a mean of 3.53 to the image of dental hygienist, which showed that the dental hygiene students took a favorable view of dental hygienists in general. 2. Their response to four items showed that they looked at the image of dental hygienist in a positive manner. The four items respectively described dental hygienists as professionals, as ones who played a crucial role in the improvement of national oral health, as ones with professional knowledge and sophisticated knowhow, and as neat and decent people. And their response to the following five items indicated that they looked at the image of dental hygienists in a negative way. One was that dental hygienists were considered to be dental nurses, and another was that the occupation of dental hygienist was a demanding and stressful job. The third was that there was no single, fixed title to call dental hygienists, and the fourth was that dental hygiene wasn't recognized as an independent area. The fifth was that the social standing of dental hygienists was sort of high. 3. In regard to the impact of the general characteristics of the dental hygiene students on their image of dental hygienist, they had a more favorable image of dental hygienist when they perceived dental hygiene in a more positive manner(p<0.001). Conclusions : In order to boost the image of dental hygienist, the working conditions of dental hygienists should be improved, and educational programs should be prepared to provided them extended continuing educational opportunities. And the kind of educational environments that could nurture dental hygienists who are convinced and have a vision should be created.

• 전자공학회논문지A
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• 제32A권1호
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• pp.185-192
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• 1995

In this study, very fine photoresist pattern was examined using the image reversal process. And very fine photoriesist pattern (less than 0.2um) was obtsined by optimizing the exposure and reversal baking condition of photoresist. The produced pattern does not show the loss of thickness, and has a sparp negative edge profile. also, the ion implanted 0.25um T-shaped gate MESFET was fabricated using this resist pattern and the directional evaporation of gate metal. The fabricated MESFET has the maximum transconductance of 302 mS/mm, and the threshold voltage of -1.8V, and the drain saturation current of this MESFET was 191 mA/mm.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.845-850
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• 2003

The scattered light pattern from a machined surface generally contains much information concerning the surface roughness. The light pattern can be acquired by optical system and analyzed by statistical method. This kind of surface roughness measurement system can be easily adopted on the machine measurement. But the fully assembled system is too complex to implement on small systems using micro-controller. This study proposes the idea of reducing the number of optical components by removing screen and examines image processing of a light pattern to minimize the negative result of incomplete optical system. And the Gaussian blur filtering is concluded to be the best method of proposed measurement system. Furthermore light intensity variation of image pattern can be treated as a signal, therefore FIR filtering gives the similar result of Gaussian blur effect.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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• pp.158-161
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• 1995

A new laser diode range-finding speedometer is proposed, which is modulated by a pair of positive and negative triangular pulse current superimposed on a dc current. Since a target velocity is directly obtained form a pure Doppler beat frequency measured during the non-modulation period, the new sensor is free from the difficulties due to the critical velocity encountered in the previous sensor. Furthermore, the different amplitude of the two triangular pluses are so adjusted that the measurable range using only one laser head is greatly expanded to 10cm through 150cm, which is about two times that of the previous sensor. The measurement accuracy for velocity of .+-.6mm/s through .+-.20mm/s and for range is about 1%, and 2%, respectively. Because the new sensor can be operated automatically using a microcomputer, it will be useful for application of a 3-D range image measurement of a slowly moving object.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.110-115
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• 1998

Through the ISODATA method, the micro-landform of Julpo-Bay tidal flat was classified into mudflat, mixedflat, and sandflat using Landsat TM image. Each showed an apparent differences in its topographical characteristics and grain size composition. For example, mudflats are formed with flat faces and tidal channel of dissected gully. Its characteristics of grain size analysis that the grains have less than mean grain size 4 phi. Its sorting is bad (higher than 1 S.D.), and it showed strongly positive skewness. But sandflat is topographically flat without tidal channel. It has developed with ripple marks. According to the grain size analysis of deposits, the soil is coarse size with 90% of sand and its sorting is well(lower than 1 S.D.) Also, it showed strongly negative skewness. Mixed flat is in between mudflat and sandflat in its characteristics.