• 한국콘텐츠학회논문지
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• 제14권5호
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• pp.107-116
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• 2014

본 연구는 지역사회네트워크 기반 사회복지프로그램 기획을 준비함에 있어 컨셉트 맵핑을 활용하고 그 적용가능성을 경험적으로 확인하는 것이다. 컨셉트 맵핑은 다양한 이해관계자들 사이의 모호하고 복잡한 아이디어를 구조화하여 시각적으로 제시해 주는 의사결정 도구이다. 이미 상담, 간호, 공중보건 등 휴먼서비스 영역을 중심으로 프로그램 기획 및 평가 과정에서 나타나는 복잡하고 추상적인 아이디어를 개념화하는데 활용되고 있다. 최근, 우리나라에서도 상담 및 의료 영역에서 서비스 제공자와 이용자 간의 존재하는 성과의 차이를 경험적으로 인지하고, 합의를 이끌어 내는 도구로 활용하고 그 효과성이 발표되고 있다. 본 연구에서는 부산광역시 북구에서 아동 청소년을 대상으로 진행되고 있는 부산공동모금회지원 CI사업의 3차년도 사업기획을 준비하면서 사업주체들이 기대하는 성과를 컨셉트 맵핑을 활용하여 개념화하였다. 컨셉트 맵핑은 준비 단계, 아이디어 수집 단계, 서술문 구조화 단계, 표현 단계, 분석결과 해석 단계, 유용화 단계로 이루어졌다. 참여자들은 부산 북구 사회복지기관 종사자 11명이였으며, 이들이 제시한 서술문은 총 60개였다. 이들이 제시한 서술문을 유사성 행렬 형태로 전환하여 다차원 척도법 분석을 실시하였다. 군집은 총 5개로, '아동 청소년의 인식 및 태도변화', '아동 청소년 체계의 변화', '우호적인 지역사회 형성', '지역주민의 변화', '사업공급주체의 변화'였다. 이 중 가장 우선적으로 성취되어야 할 성과는 '아동 청소년의 인식 및 태도 변화'로, 이 성과를 중심으로 3차년도 사업을 기획하게 되었다. 컨셉트 맵핑을 활용하여 성과를 개념화하는 의사결정과정을 거치면서, 참여 구성원들은 사업의 성과에 대해 명확하게 개념화하였고, 이 성과에 대한 합의가 도출되었다.

• 한국과학교육학회지
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• 제15권2호
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• pp.223-232
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• 1995

The purpose of this study is to investigate the effect of concept mapping strategies on the learner's achievement and their attitude change in science learning. The subject was 159 male students in a middle school in Seoul. Three experimental groups were instructed with different kinds of teaching methods about the unit of photosynthesis and digestive organs. Group I was instructed with traditional teaching method, GroupII was instructed with guided concept mapping strategy, GroupIII was instructed with student-centered concept mapping strategy. The major findings of this study are as follows. 1. Student-centered concept mapping strategy was observed effective at 0.05 significance level in achievement and retention. 2. Only student-centered concept mapping strategy changed students' attitude toward science learning positively. 3. It was observed that there was very significant correlation between the learning ability and science achievement (p<0.01). 4. Student-centered concept mapping strategy was found effective in upper learning-ability group, and guided concept mapping strategy in middle learning-ability group(p < 0.05). 5. Student-centered concept mapping strategy was effective to the groups of upper and middle learning-ability in changing students' attitude toward science learning(p < 0.05).

• ETRI Journal
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• 제37권2호
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• pp.338-347
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• 2015

The multi-carrier transmission signal in Multi-Carrier Code Division Multiple Access (MC-CDMA) has a high peak-to-average power ratio (PAPR), which results in nonlinear distortion and deteriorative system performance. An n-tuple selective mapping method is proposed to reduce the PAPR, in this paper. This method generates $2^n$ sequences of an original data sequence by adding n-tuple of n PAPR control bits to it followed by an interleaver and error-control code (ECC) to reduce its PAPR. The convolutional, Golay, and Hamming codes are used as ECCs in the proposed scheme. The proposed method uses different numbers of the n PAPR control bits to accomplish a noteworthy PAPR reduction and also avoids the need for a side-information transmission. The simulation results authenticate the effectiveness of the proposed method.

• ETRI Journal
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• 제42권1호
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• pp.108-117
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• 2020

This study proposes a robust range-only beacon mapping method for registering the locations of range-only beacons automatically. The proposed method deals with the multipath propagation of signals from range-only beacons using the range-only measurement association (RoMA) and an unscented Kalman filter (UKF). The RoMA initially predicts the candidate positions of a range-only beacon. The location of the range-only beacon is then updated using the UKF. With the proposed method, the locations of range-only beacons are accurately estimated in a multipath environment. The proposed method also provides the location uncertainty of each range-only beacon. Simulation results using the model for multipath propagation and experimental results in a real indoor environment verify the performance of the proposed method.

• Journal of Computing Science and Engineering
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• 제10권2호
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• pp.68-73
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• 2016

An efficient texture compression method is proposed based on a block matching process between the current block and the previously encoded blocks. Texture mapping is widely used to improve the quality of rendering results in real-time applications. For fast texture mapping, it is important to find an optimal trade-off between compression efficiency and computational complexity. Low-complexity methods (e.g., ETC1 and DXT1) have often been adopted in real-time rendering applications because conventional compression methods (e.g., JPEG) achieve a high compression ratio at the cost of high complexity. We propose a block matching-based compression method that can achieve a higher compression ratio than ETC1 and DXT1 while maintaining computational complexity lower than that of JPEG. Through a comparison between the proposed method and existing compression methods, we confirm our expectations on the performance of the proposed method.

• 대한원격탐사학회지
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• 제36권5_4호
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• pp.1209-1220
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• 2020

산림지역의 경우 도심지에 비해 무인항공사진측량 작업과정 중 하나인 지상기준점(ground control point, GCP) 측량이 제한적이며, 높은 산림 때문에 비가시권 비행으로 인해 안전문제가 발생한다. 이를 보완하기 위해 드론의 위치를 실시간으로 보정하는 RTK(real time kinematic) 드론과 지형정보를 기반으로 비행하는 3차원 비행 방식이 개발되고 있다. 본 연구는 산림지역에서 재난피해조사를 위한 드론의 활용방안을 제시하기 위해 1) GCP 측량을 통한 드론 맵핑(normal drone mapping), 2) 지형정보를 기반으로 비행하는 드론 맵핑(3D flight drone mapping), 3) RTK 드론을 이용한 드론 맵핑(RTK drone mapping) 3가지 방법을 통해 위치정확도를 평가하였으며, 그 결과 평면 위치오차는 2 cm, 높이오차는 13 cm 이내로 나타났다. 위치정확도 평가 후, 산사태 발생 면적을 계산하여 체적 값을 비교했을 때 세 가지 방법 모두 유사한 결과를 보였다. 본 연구에서는 3D flight drone mapping, RTK drone mapping을 통해 산림지역에서 드론 맵핑이 가지는 한계를 극복하고 재난피해조사의 활용 가능성을 확인하였다. 향후 다양하게 발생하는 재난상황을 감안하였을 때 재난지역의 여건에 따라 3가지 방법을 적절히 활용하면 보다 효과적인 피해조사를 수행할 수 있을 것으로 기대된다.

• 대한방사선방어학회:학술대회논문집
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• 대한방사선방어학회 2011년도 추계 학술발표회 및 심포지엄
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• pp.152-153
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• 2011

• Korean Journal of Mathematics
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• 제18권2호
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• pp.105-118
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• 2010

The purpose of this paper is to consider an iterative method for an equilibrium problem and a family relatively nonexpansive mappings. Weak convergence theorems are established in uniformly smooth and uniformly convex Banach spaces.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2011년도 학술발표회
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• pp.185-185
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• 2011

Mapping of artificial levee lines, one of major tasks in river zone mapping, is critical to prevention of river flood, protection of environments and eco systems in river zones. Thus, mapping of artificial levee lines is essential for management and development of river zones. Coastal mapping including river zone mapping has been historically carried out using surveying technologies. Photogrammetry, one of the surveying technologies, is recently used technology for national river zone mapping in Korea. Airborne laser scanning has been used in most advanced countries for coastal mapping due to its ability to penetrate shallow water and its high vertical accuracy. Due to these advantages, use of LiDAR data in coastal mapping is efficient for monitoring and predicting significant topographic change in river zones. This paper introduces a method for construction of a 3D artificial levee line using a set of LiDAR points that uses normal vectors. Multiple steps are involved in this method. First, a 2.5-dimensional Delaunay triangle mesh is generated based on three nearest-neighbor points in the LiDAR data. Second, a median filtering is applied to minimize noise. Third, edge selection algorithms are applied to extract break edges from a Delaunay triangle mesh using two normal vectors. In this research, two methods for edge selection algorithms using hypothesis testing are used to extract break edges. Fourth, intersection edges which are extracted using both methods at the same range are selected as the intersection edge group. Fifth, among intersection edge group, some linear feature edges which are not suitable to compose a levee line are removed as much as possible considering vertical distance, slope and connectivity of an edge. Sixth, with all line segments which are suitable to constitute a levee line, one river levee line segment is connected to another river levee line segment with the end points of both river levee line segments located nearest horizontally and vertically to each other. After linkage of all the river levee line segments, the initial river levee line is generated. Since the initial river levee line consists of the LiDAR points, the pattern of the initial river levee line is being zigzag along the river levee. Thus, for the last step, a algorithm for smoothing the initial river levee line is applied to fit the initial river levee line into the reference line, and the final 3D river levee line is constructed. After the algorithm is completed, the proposed algorithm is applied to construct the 3D river levee line in Zng-San levee nearby Ham-Ahn Bo in Nak-Dong river. Statistical results show that the constructed river levee line generated using a proposed method has high accuracy in comparison to the ground truth. This paper shows that use of LiDAR data for construction of the 3D river levee line for river zone mapping is useful and efficient; and, as a result, it can be replaced with ground surveying method for construction of the 3D river levee line.

• 한국광학회:학술대회논문집
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• 한국광학회 2007년도 하계학술발표회 논문집
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• pp.259-260
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• 2007

In this paper, we propose a novel computational integral imaging reconstruction (CIIR) method using round-type mapping model. Proposed CIIP method can overcome problems of non-uniformly reconstructed images caused from the conventional method and improve the resoulution of 3-D images. To show the usefulness of the proposed method, both computational experiment and optical experiment are carried out and their results are presented.