• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.132-132
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• 2019

첨단 IT기술과 음파와 영상을 이용한 하천 계측 기술의 결합을 통해 하천 수위와 유속을 자동으로 측정하는 기술들이 개발되고 있다. 특히, 표면영상을 이용한 자동유량계측 기술은 카메라 외에 별도로 고가의 장비를 구입할 필요가 없을 뿐 아니라 현장 상황을 영상으로 확인할 수 있기 때문에 현장조사 인력이 필요가 없어 경제적이고, 비접촉식으로 안전하여 각광받고 있는 기법이다. 하지만 표면영상유속계는 기본적으로 원근에 따른 영상왜곡이 발생하기 때문에 이를 정사영상으로 변환하는 과정이 반드시 필요하다. 하지만 대하천과 같이 하폭이 넓은 경우에는 참조점을 이용한 영상왜곡 보정이 어렵다는 한계가 있다. 또한 참조점을 이용한 영상왜곡 변환 방법의 경우 수위변화가 있는 경우 대응이 어렵다는 한계가 있다. 이에 본 연구에서는 참조점을 이용한 영상왜곡 보정 작업이 필요 없는 지표영상유속측정법(IIVM, Index Image Velocimeter)을 개발하였다. 지표영상유속측정법은 기존 표면영상유속계 달리 복잡한 영상좌표변환 과정을 매우 간단하게 처리할 수 있는 장점이 있다. 지표영상유속측정법은 지표영상유속과 카메라와 수표면 사이의 거리를 고려한 지표유속을 사용하고, 이를 통해 기존 표면영상유속계의 한계인 수위변화를 고려하기 어려웠던 점을 극복할 수 있었다. 본 연구에서는 수리실험과 현장영상을 활용하여 수위 변화에 따른 지표유속을 측정한 결과 하천 수위가 변화하는 상황에서도 표면유속을 정확하게 산정할 수 있었고, 실제 측정유속을 대신할 수 있는 지표유속으로도 활용 가능한 것을 확인하였다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.18 no.11
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• pp.18-23
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• 2019

The oil immersion method can be used to create objective lenses with long working distances without sacrificing the focusing resolution for laser processing. In this study, a space in which air or oil can be filled was formed in the middle of a lens for analyzing the optical properties of a liquid-oil immersion lens. As the refractive media, air and oils of different refractive index values (1.2 and 1.5, respectively) were used. A simulation was conducted in the ZEMAX software environment using the ray-tracing technique, and the performance of the oil immersion lens was verified by determining its image distortion and focal length (FL) in each medium. In the case of air, the calculated FL was 0.813 mm, whereas the imaged FLs were 1.594 mm and 8.126 mm when the refraction indices were 1.2 and 1.5, respectively. The FL of an oil immersion lens could be increased considerably. In terms of image distortion, the oil immersion lens exhibited little distortion at the center in all cases, but different degrees of image distortion were observed at different points away from the center depending on the refraction index degree.

• Journal of Information Technology Services
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• v.18 no.1
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• pp.153-171
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• 2019

Competition among cities has become fierce with decentralization and globalization, and each city tries to establish a brand image of the city to build its competitiveness and implement its policies based on it. At this time, surveys, expert interviews, etc. are commonly used to establish city brands. These methods are difficult to establish as sampling methods an empirical component, the biggest component of a city brand. In this paper, therefore, based on the precedent research's urban brand measurement and components, the words representing each city image property were extracted and relocated to five indicators to form the evaluation index. The constructed indicators have been validated through the review of three experts. Through the index, we analyzed the brands of four cities, Ulsan, Incheon, Yeosu, and Gyeongju, and identified the factors by using Topic Modeling and Word Cloud. This methodology is expected to reduce costs and monitor timely in identifying and analyzing urban brand images in the future.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.11b
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• pp.204-209
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• 2000

At harvest, the starch contents of apples, which were related to their maturity, were quantified by using image analysis. The stained area was measured by a computer vision system when an apple slice was stained with KI/I$_2$ solution. The stained area ratio of the stained area of the apple slice to its whole area, or the starch index, was defined as an indicator of starch content. When Tsugaru apples were manually sorted into immature, turning and mature groups, their starch indices were 0.374, 0.312 and 0.129, respectively. Meanwhile, the starch index had correlation to various physicochemical properties of Tsugaru apples. At the statistically significant level of 0.1 %, it was correlated with the pH value, bio-yield force, rupture force and color of intact and skin-removed apples. At the 1 ％ significant level, it had the correlation with the density and moisture content.

• Archives of design research
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• v.13 no.3
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• pp.313-320
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• 2000

Currently, The new wave of information technology has enormously influenced every field. In the Held of design, it is time to strive possible efforts in order to accumulate the design-related knowledge by maintaining, managing and controlling design information in a systematic manner, getting out of the old stage of mere use of data itself. Due to remarkable progress in communication media and speed, and file compression technology, text-centric data has been shifting to multimedia data such as image and motion picture. So it is currently required that methologies be developed to effectively utilize the related information. With respect to the processing of image data, it is certain that the optimal method should be come up with reflecting the unique characteristics and utilization of image data, apart from the traditional way of processing and storing the legacy text-based data. The study suggests the system of indexing and implementing design image information through the case of analyzing design image data, abstracting data elements of image itself, and finally applying it to building image-oriented database for use.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.36 no.5
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• pp.413-422
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• 2018

Many applications using satellite data from high-resolution multispectral sensors require an image fusion step, known as pansharpening, before processing and analyzing the multispectral images when spatial fidelity is crucial. Image fusion methods are to improve images with higher spatial and spectral resolutions by reducing spectral distortion, which occurs on image fusion processing. The image fusion methods can be classified into MRA (Multi-Resolution Analysis) and CSA (Component Substitution Analysis) approaches. To suggest the efficient image fusion method for Pleiades and KOMPSAT (Korea Multi-Purpose Satellite) 3 satellites, this study will evaluate image fusion methods for multispectral and panchromatic images. HPF (High-Pass Filtering), SFIM (Smoothing Filter-based Intensity Modulation), GS (Gram Schmidt), and GSA (Adoptive GS) were selected for MRA and CSA based image fusion methods and applied on multispectral and panchromatic images. Their performances were evaluated using visual and quality index analysis. HPF and SFIM fusion results presented low performance of spatial details. GS and GSA fusion results had enhanced spatial information closer to panchromatic images, but GS produced more spectral distortions on urban structures. This study presented that GSA was effective to improve spatial resolution of multispectral images from Pleiades 1A and KOMPSAT 3.

• Journal of the Korean Society of School Health
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• v.14 no.2
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• pp.249-268
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• 2001

This study was carried out to identify the effects of an art therapy program based on reality therapy on the weight control, body image, and self-esteem of college students. The program was developed by the authors. The design was a pretest-post test control group design. The subjects were college students attending M college : 8 in experimental group A, 6 in experimental group 2, who wanted to control their body weight and 16 in the control group who didn't attend the program those in the experimental group attended the program once (group A) or twice (group B) per week meeting a total of six times. The data were analyzed by quantity method (SPSS 10.0 program) and quality method(process analysis). The results were as follows : 1. The average obesity index of pre-test, post-test, and a follow-up test decreased from 8.9% to 6.1%, 3.7%. And the rate of decrease both pre-post and post-follow up were statistically significant 2. The average obesity index of group A decreased from 9.6% to 6.3%, 4.1% and the rate of decrease between pre and post were statistically significant. But the rate of decrease between post and follow-up were statistically not significant 3. The average obesity index of group B decreased from 7.8% to 5.8%, 3.1% and the rate of decrease between pre and post were not significant statistically. But the rate of decrease between post and follow-up were statistically significant 4. The average scores of pre and post body image increased and were statistically significant : group A from 129.0 to 153.5, group B from 127.7 to 155.2. 5. The average scores of pre and post semantic differential method increased and were statistically significant: group A from 38.1 to 44.1, group B from 38.0 to 45.0. 6. The average scores of pre and post self-esteem increased: group A increased from 37.3 to 40.3 and were statistically significant, group B increased from 36.5 to 39.5 but was statistically insignificant 7. The average scores of pre and post obesity rate, body image, semantic differential method and self-esteem in the control group were not statistically significant 8. The pre and post scores of body image(p=.001), semantic differential method(p=.001) and self-esteem(p=.039) between experimental and control group were statistically significant. 9. In Duncan multiple comparison, it was not statistically significant between group A and B, but statistically significant between group A and the control group, group B and the control group in obesity index, body image, semantic differential method. There was no statistically significance among the three groups in self esteem 10. In Duncan multiple comparison, group A gained higher scores than group B in obesity index(-1.2%), and self esteem(0. 3). Group B gained higher scores than group A in body image(3. 0), and semantic differential method(1. 0). So it is difficult to conclude whether group A or B is more effective. In conclusion, the art therapy program based on reality therapy was effective in weight the control program of college students: obesity was decreased, the scores of body image and semantic differential method and self-esteem were increased. The scores of group A were increased more than group Band were statistically significant, The time interval was a very important factor in this program. The recommendation is : the validity of this program has to be tested through various subjects and in various areas. And also this program has to be tested in other topics.

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2001.04a
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• pp.58-61
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• 2001

• Journal of dental hygiene science
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• v.24 no.3
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• pp.200-207
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• 2024

Background: This study aimed to evaluate whether a Novel Plaque Index (NPI) using intraoral camera images would be more useful for assessing the accumulated area of dental plaque compared to three other indices. Methods: This study evaluated 80 disclosed plaque tooth surface images from 40 participants, including the facial surfaces of the maxillary left first molar and mandibular left central incisor. The tooth surface was divided longitudinally into three sections, with each section further subdivided into four subsections. A score ranging from 0 to 5 was assigned to each longitudinal third, and the average score was determined as the NPI score for the tooth surface. Two examiners assessed the NPI, Patient Hygiene Performance Index, Quigley and Hein Plaque Index, and Rustogi's Modified Navy Plaque Index scores obtained using the plaque images. The assessments were repeated twice with a 2-weeks washout period. The Plaque Percent Index (PPI) score calculated via image analysis is considered the gold standard. Results: The NPI showed the highest correlation coefficient with PPI compared to the other indices (examiner 1: 0.87, examiner 2: 0.88). The intraexaminer reliability of the NPI was excellent for both examiners. The intraclass correlation coefficient (ICC) for examiner 1 and 2 was 0.95 and 0.93, respectively. The weighted kappa values were >0.85 for both examiners. The ICC of the interexaminer analysis was 0.93 and the weighted kappa showed a reliability value of 0.81. Conclusion: The NPI was found to have greater validity and reliability than the three existing indices for the quantitative scoring of dental plaque.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.4021-4030
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• 2015

Pulse wave is the physiological responses through the autonomic nervous system such as ECG. It is relatively convenient because it can measure the signal just by applying a sensor on a finger. So, it can be usefully employed in the field of U-Healthcare. The objects of this study are acquiring the PPG (Photoplethysmography) one of the way of measuring the pulse waves in non-invasive way using the CMOS image sensor on a smartphone camera, developing the portable system judging stressful or not, and confirming the applicability in the field of u-Healthcare. PPG was acquired by using image data from smartphone camera without separate sensors and analyzed. Also, with that image signal data, HRV (Heart Rate Variability) and stress index were offered users by just using smartphone without separate host equipment. In addition, the reliability and accuracy of acquired data were improved by developing additional hardware device. From these experiments, we can confirm that measuring heart rate through the PPG, and the stress index for analysis the stress degree using the image of a smartphone camera are possible. In this study, we used a smartphone camera, not commercialized product or standardized sensor, so it has low resolution than those of using commercialized external sensor. However, despite this disadvantage, it can be usefully employed as the u-Healthcare device because it can obtain the promising data by developing additional external device for improvement reliability of result and optimization algorithm.