• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권8호
• /
• pp.3962-3980
• /
• 2019

To deal with single sample face recognition, this paper presents a patch based semi-supervised linear regression (PSLR) algorithm, which draws facial variation information from unlabeled samples. Each facial image is divided into overlapped patches, and a regression model with mapping matrix will be constructed on each patch. Then, we adjust these matrices by mapping unlabeled patches to $[1,1,{\cdots},1]^T$. The solutions of all the mapping matrices are integrated into an overall objective function, which uses ${\ell}_{2,1}$-norm minimization constraints to improve discrimination ability of mapping matrices and reduce the impact of noise. After mapping matrices are computed, we adopt majority-voting strategy to classify the probe samples. To further learn the discrimination information between probe samples and obtain more robust mapping matrices, we also propose a multistage PSLR (MPSLR) algorithm, which iteratively updates the training dataset by adding those reliably labeled probe samples into it. The effectiveness of our approaches is evaluated using three public facial databases. Experimental results prove that our approaches are robust to illumination, expression and occlusion.

• Advances in robotics research
• /
• 제2권1호
• /
• pp.45-57
• /
• 2018

Even though the popularity of projection mapping continues to increase and it is being implemented in more and more settings, most current projection mapping systems are limited to special purposes, such as outdoor events, live theater and musical performances. This lack of versatility arises from the large number of projectors needed and their proper calibration. Furthermore, we cannot change the positions and poses of projectors, or their projection targets, after the projectors have been calibrated. To overcome these problems, we propose a projection mapping method using a projector robot that can perform projection mapping in more general or ubiquitous situations, such as shopping malls. We can estimate a projector's position and pose with the robot's self-localization sensors, but the accuracy of this approach remains inadequate for projection mapping. Consequently, the proposed method solves this problem by combining self-localization by robot sensors with position and pose estimation of projection targets based on a 3D model. We first obtain the projection target's 3D model and then use it to accurately estimate the target's position and pose and thus achieve accurate projection mapping with a projector robot. In addition, our proposed method performs accurate projection mapping even after a projection target has been moved, which often occur in shopping malls. In this paper, we employ Ubiquitous Display (UD), which we are researching as a projector robot, to experimentally evaluate the effectiveness of the proposed method.

• Kyungpook Mathematical Journal
• /
• 제58권2호
• /
• pp.291-305
• /
• 2018

In this paper, we prove a general uniqueness theorem which is useful for proving the uniqueness of the relevant additive mapping, quadratic mapping, cubic mapping, quartic mapping, or the additive-quadratic-cubic-quartic mapping when we investigate the (generalized) Hyers-Ulam stability.

• 대한지구과학교육학회지
• /
• 제2권1호
• /
• pp.80-90
• /
• 2009

The purpose of this study is to investigate the characteristics of the mind maps which were drawn with pencil or color pens by elementary students. For this study, 31 students of the 6th grade were selected and trained mind mapping. After training, the subjects had drawn mind maps with color pens about the ROCK for 15minutes and drew mind maps with pencil after 2days of mind mapping using color pens. In addition to activities of mind mapping, the students handed in their papers which were written one's impression of drawing two kinds of mind mapping. The results were follows: First, in central circle which was linked words connected firstly with ROCK as key word, the difference of 2kinds mind maps were little showed in the quantity and quality of the words, branches and their adequacy. Second, the mind maps using pencils had more words, branches and images than mind maps of using color pens in the whole assessment. Third, the most students suggested that the mind mapping using pencil were advantage to economy of time, retouching words and branches, also the mind mapping using pencil made the students relax the strain for drawing it because of retouching possibility. Consequently, the results of this study suggest the mind mapping using pencil has advantage effect on the purpose of gaining students' thinking abundantly and economy of time in elementary science classes.

• 한국과학교육학회지
• /
• 제29권8호
• /
• pp.898-909
• /
• 2009

이 연구에서는 화학 개념학습에서 역할놀이 비유가 대응 관계 이해도 및 대응 오류에 미치는 영향을 비유추론 능력에 따라 조사하였다. 중학교 1학년 학생 151명을 비교 집단과 '원 안에서 달리기' 역할놀이 비유를 사용한 처치 집단으로 배치하였다. 목표 개념인 '기체의 부피와 압력의 관계'에 대한 각 집단별 수업을 진행한 후, 바로 다음 차시에 대응 관계 이해도 검사를 실시하였고, 4주 후에 파지 검사를 실시하였다. 또한, 대표적인 대응 오류를 범한 학생들의 대응 과정을 조사하기 위해 면담을 실시하였다. 연구 결과, 역할 놀이 비유는 학생들의 비유 추론 능력에 관계없이 대응 관계 이해 및 대응 관계 이해 파지를 향상시키는 것으로 나타났다. 대응 오류에서도 역할놀이 비유를 사용한 처치 집단 학생들이 비교 집단 학생들보다 대응 오류의 빈도가 낮았다. 그러나 두 집단의 학생들 모두 유사한 대응 오류를 범하는 것으로 나타났고, 학생들의 비유 추론 능력에 따른 대응 오류 유형별 빈도 차이는 없었다. 이에 대한 교육학적 함의를 논의하였다.

• 대한수학회논문집
• /
• 제31권3호
• /
• pp.507-518
• /
• 2016

The aim of this paper is to prove some strong convergence theorems for the modified Ishikawa iteration process involving a pair of a generalized asymptotically nonexpansive single-valued mapping and a quasi-nonexpansive multi-valued mapping in the framework of $\mathbb{R}$-trees under the gate condition.

• 한국과학교육학회지
• /
• 제23권6호
• /
• pp.617-626
• /
• 2003

과학교육에 있어 지금까지 개발된 수업모형은 마치 과학의 모든 목적을 달성시켜줄 것 같지만 실제 교육현장에 적용해 보면 기대하던 효과를 얻지 못하는 경우가 많다. 수업의 효과를 극대화하기 위해서는, 어느 한가지 방법만을 고수하는 것보다 개발된 수업모형을 유연성 있게 활용 할 수 있는 교사의 수업전략이 필요하다. 본 연구는 개념도와 순환학습을 통합한 수업이 개념도를 활용한 수업이나 순환학습과 비교하여 고등학생들의 학업성취도 및 과학적 탐구능력, 과학에 대한 태도에 어떠한 영향을 주는지 알아보는데 그 목적이 있다. 연구대상은 고등학교 2학년 여학생 324명으로, 개념도-순환학습 집단, 개념도 활용 집단, 순환학습 집단, 전통적 수업 집단의 4집단으로 나누어 수업하였다. 연구 단원은 고등학교 과학의 '생식과 유전' 단원으로 약 10주간 10차시에 걸쳐 수업처치 하였다. 수업처치 전, 후에 학업성취도 검사와 과학적 탐구능력, 과학에 대한 태도 검사를 실시하였고, 연구결과는 공변량 분석 (ANCOVA과)과 사후 검증(Duncan test)으로 분석하였다. 개념도-순환학습은 학생들의 과학 학업성취도를 향상시키는데 전통적인 수업보다 효과적이었고(p< .05) 그 효과면에서 개념도를 활용한 수업보다 떨어지지 않았다. 성취 수준이 상위와 중위 학생들은 수업방법에 따라 학업성취도에 차이를 보이지 않았으나, 하위학생들은 개념도를 활용한 수업이 가장 효과적이었다(p< .05). 개념도-순환학습은 학생들의 과학적 탐구능력을 신장시키는데 개념도를 활용한 수업이나 전통적 수업보다 효과적이었으며(p< .05) 그 효과 면에서 순환학에 떨어지지 않았다. 성취수준이 상위인 학생은 수업방식에 따라 과학적 탐구능력에 차이를 보이지 않았으나, 개념도-순환 학습은 중위와 하위 학생들의 과학탐구능력 향상에 순환학습 만큼 효과적이었다. 개념도-순환학습은 학생들의 과학에 대한 태도를 향상시키는데 전통적 수업보다 효과적이었으며(p< .05) 그 효과 면에서 개념도 활용 학습이나 순환학습에 뒤지지 않았다. 따라서 개념도 순환 학습은 모든 학생들의 수준을 고려 할 때 학생들의 학업성취도를 향상시키고, 과학적 탐구능력을 신장시키는데 개념도 활용학습이나 순환학습을 단독으로 적용하는 것보다 긍정적이라고 할 수 있다.

• Journal of information and communication convergence engineering
• /
• 제8권3호
• /
• pp.312-316
• /
• 2010

Conformal mapping has been a familiar tool of science and engineering for generations. The methods of numerical mapping are usually classified into those which construct the map from standard domain such as the unit disk onto the 'problem domain', and those which construct the map in the reverse direction. We treat numerical conformal mapping from the unit disk onto the Jordan regions as the problem domain in this paper. The traditional standard methods of this type are based on Theodorsen integral equation. Wegmann's method is well known as a Newton-like efficient one for solving Theodorsen equation. An improved method for convergence by applying low frequency pass filter to the Wegmann's method was proposed. In this paper we propose an effective algorithm for numerical conformal mapping based on the improved method. This algorithm is able to determine the discrete numbers and initial values automatically in accordance with the given region and the required accuracy. This results come from analyzing the shape of given domain as seen in the Fourier Transform.

• International Journal of Knowledge Content Development & Technology
• /
• 제2권1호
• /
• pp.51-65
• /
• 2012

While science and technology information service portals and heterogeneous databases produced in Korea and other countries are integrated, methods of connecting the unique classification systems applied to each database have been studied. Results of technologists' research, such as, journal articles, patent specifications, and research reports, are organically related to each other. In this case, if the most basic and meaningful classification systems are not connected, it is difficult to achieve interoperability of the information and thus not easy to implement meaningful science technology information services through information convergence. This study aims to address the aforementioned issue by analyzing mapping systems between classification systems in order to design a structure to connect a variety of classification systems used in the academic information database of the Korea Institute of Science and Technology Information, which provides science and technology information portal service. This study also aims to design a mapping system for the classification systems to be applied to actual science and technology information services and information management systems.

• Journal of information and communication convergence engineering
• /
• 제14권2호
• /
• pp.97-105
• /
• 2016

With the increasing demand for interoperability among existing learning resource systems in order to enable the sharing of learning resources, such resources need to be annotated with ontologies that use different metadata standards. These different ontologies must be reconciled through ontology mediation, so as to cope with information heterogeneity problems, such as semantic and structural conflicts. In this paper, we propose an ontology-mapping technique using Semantic Web Rule Language (SWRL) to generate semantic mapping rules that integrate learning resources from different systems and that cope with semantic and structural conflicts. Reasoning rules are defined to support a semantic search for heterogeneous learning resources, which are deduced by rule-based inference. Experimental results demonstrate that the proposed approach enables the integration of learning resources originating from multiple sources and helps users to search across heterogeneous learning resource systems.