• Journal of the Korea Society of Computer and Information
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• v.4 no.2
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• pp.141-146
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• 1999

In this paper, picture set filter is proposed for preserving compression ratio and video qualify. This filter controls the compression ratio of each frame depending on the correlation to the reference frame by selectively eliminating less important high-resolution areas. Consequently, video quality can be preserved and bit rate can be controlled adaptively. In the simulation, to test the performance of the proposed coding method, comparisons with the full search block matching algorithm and the differential image coding algorithm are made. In the former case, video quality, compression ratio and encoding time is improved. In the latter case, video quality is degraded, but compression ratio and encoding time is improved. Consequently. the proposed method shows a reasonably good performance over existing ones.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.1
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• pp.61-67
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• 2011

In this paper, a new method for effective video coding is studied. Picture set filter is proposed for preserving compression ratio and video quality. This filter controls the compression ratio of each frame depending on the correlation to the reference frame by selectively eliminating less important high-resolution areas. Consequently, video quality can be preserved and bit rate can be controlled adaptively. In the simulation, to test the performance of the proposed coding method, comparisons with the full search block matching algorithm and the differential image coding algorithm are made. In the former case, video quality, compression ratio and encoding time is improved. In the latter case, video quality is degraded, but compression ratio and encoding time is improved. Consequently, the proposed method shows a reasonably good performance over existing ones.

• Journal of the Korea Society of Computer and Information
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• v.4 no.3
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• pp.73-77
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• 1999

In this paper. wavelet transform coding for image conference is studied. Original video frames are transformed into hierarchical pyramidal images with multiresolution using the band property of wavelet transform coefficients. Moving information between neighboring frames is obtained from the low-resolution band. Also, to control the video coding procedure. a new picture set filter is proposed. This filter controls the compression ratio of each frame depending on the correlation to the reference frame by selectively eliminating less important high-resolution areas. Consequently. video quality can be preserved and bit rate can be controlled adaptively In the simulation, to test the performance of the proposed coding method, comparisons with the full search block matching algorithm and the differential image coding algorithm are made. Consequently. the proposed method shows a reasonably good performance over existing ones.

• Journal of Information Management
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• v.6 no.4
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• pp.90-93
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• 1973

본고(本稿)는 $4\frac{1}{2}$년간(年間)($1966{\sim}1071$)에 수행(遂行)된 일련(一連)의 연구중(硏究中) 최종회(最終回)로서 보문(報文)이 게재(揭載)되기 전(前) 과학자(科學者)들이 연구(硏究)를 시작(始作)한 때부터 여러 가지 정형(定形) 및 비정형(非定形) 매체(媒體)를 통(通)한 정보(情報)의 유통(流通)으로 과학정보(科學情報)의 전파(傳播)와 동화(同化)를 알기 쉬운 그림으로 설명(說明)한 것이다. 본고(本稿)는 1968/1969년(年) 보문(報文)을 게재(揭載)한 후 2년간(年間)의 "정보생산과학자(情報生産科學者)"들에 의한 과학분야(科學分野)의 연구(硏究)와 정보교환(情報交換)을 탐색분석(探索分析)을 행한 것으로 그 결과(結果)는 약 반수(半數)가 초기보문(初期報文)과는 다른 연구대상영역(硏究對象領域)으로 변경(變更)되었음을 보여주고 있다. 그렇지만 이러한 변화(變化)는 과학자(科學者)들의 정보생산성(情報生産性)을 감소(減少)시키거나 정보수요(情報需要)를 크게 증가(增加)시키지도 않았다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.739-742
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• 2001

영상처리 기법을 이용하여 움직이는 물체를 추적하는 시스템은 많은 분야에 응용될 수 있다. 기존의 물체 추적 시스템에서 사용한 방법들은 최적의 특성을 지니고 있지만, 많은 계산량을 요구하는 단점이 있다. 또한 단안에 의한 영상의 경우 물체의 다양한 변화에 대한 예측과 추적이 어렵다. 따라서 본 논문에서는 양안에 의해 얻어진 스테레오 영상에 전이(translation)와 회전(rotation)에서의 예측이 어려운 단점을 보완한 블록 정합 알고리즘을 적용함으로써 실시간 물체의 변화의 추적능력을 지니면서도 그 계산량을 줄일 수 있는 추적 방법에 대하여 기술한다. 또한 히스토그램의 계수 변화를 이용함으로써 블록 정합 알고리즘에서의 탐색영역을 제한하도록 하여 불필요한 처리시간을 절약하는 효율적인 물체추적 시스템을 제안한다.

• Journal of Nutrition and Health
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• v.49 no.5
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• pp.378-394
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• 2016

Purpose: Screening of preschool-age children for nutrition programs to improve dietary intake and behaviors requires cost-effective and easily administered validated assessment tools. The purpose of this study was to develop a parent/caregiver-administered instrument for measuring diet quality and behaviors of preschoolers as a nutrition quotient for preschoolers (NQ-P). Methods: Development of NQ-P was carried out in three steps: item generation, item reduction, and validation. The 24-h dietary record was selected as the gold standard reference tool. The 38 items of the NQ-P checklist were derived from a systematic literature review, expert in-depth interviews, statistical analysis of the fifth Korean National Health and Nutrition Examination Survey data, and national nutrition policies and recommendations. Self-administered questionnaires were delivered to parents who recorded 24-h dietary intakes of 100 responders aged 3~5 yr. Pearson's correlation was used to measure the level of agreement between questionnaires. Item reduction was performed, and 20 items were selected based on survey results, expert reviews, and priorities of national nutrition policy and recommendations. The 412 nationwide subjects sampled through daycare centers completed the 20-item checklist questionnaire. The construct validity of the NQ-P was assessed using confirmatory factor analysis, LISREL. Results: After analyses of exploratory factors, NQ-P items identified three dimensions of diet (balance, moderation, and environment). The three-factor structure accounted for 49.28% of the total variance. Standardized path coefficients were used as weights of the items. The NQ-P and three-factor scores of the subjects were calculated by the obtained weights of the questionnaire items. Conclusion: A food behavior checklist for preschoolers' NQ would be a useful and suitable instrument for evaluating nutrition adequacy and dietary quality of Korean preschoolers.

• Journal of The Korean Association For Science Education
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• v.18 no.4
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• pp.485-491
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• 1998

In this study, the achievement of Korean biology gifted-students was compared with that of International Biology Olympiad(IBO) participants to explore international achievement level of biology and to suggest the need of teaching program for biology gifted-students. Korean thirty gifted-students were selected through test by Korean Biology Olympiad Committee. They examined theoretical test two times in January and March. 1998. Theoretical part consisted of eight domains as follows; cell biology. anatomy and physiology of plants, anatomy and physiology of animals, ethology. genetics and evolution, ecology, systematics, and microbiology. As a result, Korean biology gifted-students had lower achievement than IBO participants in eight domains. and especially much lower achievement in ethology and systematics. Though thirty Korean gifted-students were found to had much lower achievement than lBO participants, four higher rankers of them are in prospect of winning bronze medals. Thus, it is necessary to develope an appropriate teaching program for biology gifted-students with theoretical lectures and inquiry activities.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.389-392
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• 2010

In this paper, it presents to detect location using structural information of hand from the input color images on Webcam and to recognize hand gestures. In this system, based on the skin color, the image changes a binary number and labels. Within each labeled area, we can find the Maximum Inscribed Circle using Voronoi Diagram. This circle can find the center of hand. And the circle extracts hand region from analyzing the ellipse elements to relate Maximum Inscribed Circle. We use the Maximum Inscribed Circle and the ellipse elements as characteristic of hand gesture recognition. In various environments, we cannot recognize the object that have similar colors like the background colors. But the proposed algorithm has the advantage that can be effectively eliminated about it.

• The Journal of Korean Association of Computer Education
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• v.20 no.4
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• pp.47-57
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• 2017

The purpose of this study is to verify the effectiveness of a CT-CPS(Computational Thinking-based Creative Problem Solving) instructional model on the cognitive and the affective area of middle school students' software class. To achieve our goal, we explored theoretical background and designed a lesson plan based on CT-CPS instructional model. Then we analyzed our experimental results after applying the lesson plan to middle school students. We performed our experiment to an experimental group by using our CT-CPS instructional model-based lesson plans, and we carried out three pre and post tests about cognitive and affective area, i.e. creative problem solving ability, meta cognition and motivation of learning. As a result, most of the test factors were statistically improved, so the effectiveness of the CT-CPS instructional model on the cognitive and the affective area of middle school students' software class was verified.

• The Journal of the Acoustical Society of Korea
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• v.37 no.2
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• pp.118-128
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• 2018

In this paper, we have studied how to search an underwater object by learning the image generated by the side scan sonar in the convolution neural network. In the method of human side analysis of the side scan image or the image, the convolution neural network algorithm can enhance the efficiency of the analysis. The image data of the side scan sonar used in the experiment is the public data of NSWC (Naval Surface Warfare Center) and consists of four kinds of synthetic underwater objects. The convolutional neural network algorithm is based on Faster R-CNN (Region based Convolutional Neural Networks) learning based on region of interest and the details of the neural network are self-organized to fit the data we have. The results of the study were compared with a precision-recall curve, and we investigated the applicability of underwater object detection in convolution neural networks by examining the effect of change of region of interest assigned to sonar image data on detection performance.