• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1999년도 KOBA 방송기술 워크샵 KOBA Broadcasting Technology Workshop
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• pp.165.1-170
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• 1999

Object segmentation fro natural video scenes has recently become one of very active research to pics due to the object-based video coding standard MPEG-4. Object detection and isolation is also useful for object-based indexing and search of video content, which is a goal of the emerging new standard, MPEG-7. In this paper, an automatic segmentation method of moving objects in image sequence is presented which is applicable to multimedia content authoring for MPEG-4, and two different segmentation approaches suitable for surveillance applications are addressed in raw data domain and compressed bitstream domains. We also propose an object-based video description scheme based on object segmentation for video indexing purposes.

• 한국자기학회지
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• 제5권5호
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• pp.618-622
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• 1995

We studied the effects of Pt and Cr addition in a new Co-Cr-P-Pt alloy system with the coercivity higher than 2000 Oe even when they were deposited without substrate heating and bias voltage. The coercivity of the films increased from 1000 to 2000 Oe or higher by addition of 12 at.%Pt. The variation of the anisotropy field with increasing Pt content was similar to that of the coercivity. This indicate that the increase of the coercivity might be associated with increase of the anisotropy field with Pt addition. With the addition of Cr, the coercivity of the films increased up to 8 at.%Cr and the coercive squareness of the films decreased. The angular variation of coercivity deviated at a lower angle from domain wall motion mode as the Cr content increases. From these result, it is believed that the grain isolation of the films is enhanced with the addition of Cr.

• International Journal of Knowledge Content Development & Technology
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• 제12권3호
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• pp.31-49
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• 2022

The study presents a global research scenario in the domain of quantum sensing in quantitative and qualitative terms. The study is based on an analysis of 588 global publications in the field, sourced from the Scopus database for the period 1991-2020. The study identified key countries, organizations and authors, network collaborative linkages at national, institutional, and author level. In addition, it identified broad subject areas intersecting quantum sensing research, key journals for research communications, and broad characteristics of highly-cited papers. The study finds that the USA and Germany lead the world ranking in quantum sensing research with a combined share of 50% to the global output. The USA, Germany, and Italy are the home countries to 13 of the top 15 most productive organizations, and also the home countries to 14 of the top 15 most productive authors in the subject. The top journals publishing most research publications are Physical Review A, Physical Review Letters and New Journal of Physics. However, in the most cited journals list in the subject, Agriculture & Forest Meterology, Science and Physical Review A tops the list.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 봄 학술논문 발표대회
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• pp.61-62
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• 2022

The unit quantity is an important factor influencing the durability, workability, and quality of concrete. Methods for measuring the unit quantity include a high frequency heating method, a unit volume mass method, a capacitance method, and a microwave method. However, these methods have disadvantages of poor measurement method, time required, and accuracy, and a relatively experimental method compensating for these disadvantages was used to measure the unit quantity using a high frequency main sensor (FDR) capable of simple and fast measurement. In addition, the unit quantity was evaluated by analyzing the measurement data through deep learning.

• Asia pacific journal of information systems
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• 제31권3호
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• pp.335-357
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• 2021

As reproduction of images can be done with ease, copy detection has increasingly become important. In the duplication process, image modifications are likely to occur and some alterations are deliberate and can be viewed as attacks. A wide range of copy detection techniques has been proposed. In our study, content-based copy detection, which basically applies DCT-based features for images, namely, pixel values, edges, texture information and frequency-domain component distribution, is employed. Experiments are carried out to evaluate robustness and sensitivity of DCT-based features from attacks. As different types of DCT-based features hold different pieces of information, how features and attacks are related can be shown in their robustness and sensitivity. Rather than searching for proper features, use of robustness and sensitivity is proposed here to realize how the attacked features have changed when an image attack occurs. The experiments show that, out of ten attacks, the neural networks are able to detect seven attacks namely, Gaussian noise, S&P noise, Gamma correction (high), blurring, resizing (big), compression and rotation with mostly related to their sensitive features.

• 한국과학교육학회지
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• 제36권1호
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• pp.87-101
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• 2016

본 연구의 목적은 초등학교에서 개발 시행된 서술형 평가 문항의 내용타당도를 분석하는데 있으며, 이 평가 문항들의 개선을 위한 기초자료를 제시하는데 연구의 의의가 있다. 이를 위하여 여러 초등학교의 서술형 평가문항을 수집하고, 이원분류표의 평가목표와 문항의 평가목표가 요구하는 행동소를 비율차 검정하였다. 분석의 결과 교사가 제작한 서술형 평가문항은 '지식', '이해'를 주로 측정하고 있으며, 행동영역의 내용타당도가 낮음을 확인하였다. 내용타당도가 낮은 결과를 설명하기 위해 9명의 초등 교사를 대상으로 면담을 실시하였다. 면담의 결과 초등학교 과학과 서술형 평가문항의 내용타당도 확보를 저해하는 요인으로 교사내적요인과 교사외적요인을 추출하였다. 교사내적요인에는 바르지 않은 이원분류표의 작성법, 초등학생의 발달 단계 고려, 난이도, 채점의 용이성, 경로의존성 등이 포함되었다. 그리고 교사외적으로는 교육과정 및 학부모 그리고 행정적 요소 등이었다. 이상의 결과를 바탕으로 과학교사의 서술형 평가전문성을 위한 요인들을 제언하였다.

• 한국초등수학교육학회지
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• 제23권4호
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• pp.437-457
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• 2019

본 연구에서는 우리나라 초등학교 수학과 교육과정 중 도형 영역의 내용 및 성취기준이 어떻게 변화되어 왔는지 분석하였다. 이를 위해 2015 개정 교육과정을 기본으로 한 분석틀을 기초로 시기별 성취기준을 연속형, 소멸형, 추가형으로 분류하여 그 특성을 살펴보았다. 도형 영역에서 연속형 성취기준은 전체의 51%이고, 학년 및 영역의 변동 없이 지속된 성취기준이 많았다. 소멸형 성취기준은 전체의 20.4%이고, 제3차의 수학 현대화의 영향으로 급격하게 도입되었던 학습 내용들이 제4차 교육과정에서 삭제되면서 가장 많이 소멸되었고, 제7차 교육과정 이후에는 단계형 교육과정과 학년군의 도입으로 학습 내용이 통합되거나 중학교로 이동되면서 소멸되었다. 추가형 성취기준은 전체의 28.6%이고, 제7차 교육과정에서 공간 감각 기르기가 도입되면서 성취기준이 가장 많이 추가되었다. 도형 영역에서 추가형 성취기준이 소멸형 성취기준보다 많은 것은 학습 내용 축소라는 교육과정 개정의 큰 흐름에도 불구하고 시대에 맞는 기하 내용을 적극적으로 도입하려고 노력한 결과라고 할 수 있다. 이와 같은 연구의 결과가 향후 교육과정 개발 시 새로운 성취기준의 구성에 있어서 기초자료로 활용되기를 기대한다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.389-394
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• 2005

In this study we carried out to evaluate the salinity concentration and volumetric water content of unsaturated soil column using frequency domain Reflectometry with vector network analyzer (FDR-V) measurement system. All of experiments were considered to the effect of temperature which ranges from l0$^{\circ}C$ to 50$^{\circ}C$ increasing the interval of l0$^{\circ}C$ controlled by the constant temperature container. From the results the responses of complex dielectric constant which consist of the real part and imaginary parts have the effect of volumetric water content and concentration of salinity at 1GHz. Use of derived equations (1) and (2) can be calculated the physical parameters such as volumetric water content and salinity concentration of unsaturated media by the responses of complex dielectric constant.

• Asian Pacific Journal of Cancer Prevention
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• 제16권15호
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• pp.6719-6727
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• 2015

Background: The objective of this study was to assess the readability, suitability, and health content of cancer screening information in municipal newspapers in Japan. Materials and Methods: Suitability Assessment of Materials (SAM) and the framework of Health Belief Model (HBM) were used for assessment of municipal newspapers that were published in central Tokyo (23 wards) from January to December 2013. Results: The mean domain SAM scores of content, literacy demand, and layout/typography were considered superior. The SAM scores of interaction with readers, an indication of the models of desirable actions, and elaboration to enhance readers' self-efficacy were low. According to the HBM coding, messages of medical/clinical severity, of social severity, of social benefits, and of barriers of fear were scarce. Conclusions: The articles were generally well written and suitable. However, learning stimulation/motivation was scarce and the HBM constructs were not fully addressed. Practice implications: Articles can be improved to motivate readers to obtain cancer screening by increasing interaction with readers, introducing models of desirable actions and devices to raise readers' self-efficacy, and providing statements of perceived barriers of fear for pain and time constraints, perceived severity, and social benefits and losses.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권1호
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• pp.391-406
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• 2015

Social media have emerged as new communication channels between consumers and companies that generate a large volume of unstructured text data. This social media content, which contains consumers' opinions and interests, is recognized as valuable material from which businesses can mine useful information; consequently, many researchers have reported on opinion-mining frameworks, methods, techniques, and tools for business intelligence over various industries. These studies sometimes focused on how to use opinion mining in business fields or emphasized methods of analyzing content to achieve results that are more accurate. They also considered how to visualize the results to ensure easier understanding. However, we found that such approaches are often technically complex and insufficiently user-friendly to help with business decisions and planning. Therefore, in this study we attempt to formulate a more comprehensive and practical methodology to conduct social media opinion mining and apply our methodology to a case study of the oldest instant noodle product in Korea. We also present graphical tools and visualized outputs that include volume and sentiment graphs, time-series graphs, a topic word cloud, a heat map, and a valence tree map with a classification. Our resources are from public-domain social media content such as blogs, forum messages, and news articles that we analyze with natural language processing, statistics, and graphics packages in the freeware R project environment. We believe our methodology and visualization outputs can provide a practical and reliable guide for immediate use, not just in the food industry but other industries as well.