• Journal of the Institute of Electronics Engineers of Korea CI
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• v.42 no.4 s.304
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• pp.25-32
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• 2005

The spread of mobile devices, PDAs and sensors has enabled the construction of ubiquitous computing environments, transforming regular physical spaces into 'Smart space' augmented with intelligence and enhanced with services. However, the deployment of this computing paradigm in real-life is disturbed by poor security, particularly, the lack of proper authentication and authorization techniques. Also, it is very important not only to find security measures but also to preserve user privacy in ubiquitous computing environments. In this Paper, we propose efficient user authentication and authorization model with anonymity for the privacy-preserving for ubiquitous computing environments. Our model is suitable for distributed environments with the computational constrained devices by using MAC-based anonymous certificate and security association token instead of using Public key encryption technique. And our Proposed Protocol is better than Kerberos system in sense of cryptographic computation processing.

• Journal of Information Management
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• v.42 no.2
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• pp.103-120
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• 2011

The astronomical data obtained by observations of celestial objects movements are useful in our daily life. These data - such as 1) sunrise and sunset data, 2) data transformation between lunar calendar and solar calendar, 3) solar eclipse and lunar eclipse data, and 4) sun's altitude and azimuth data - were used to important things in the agricultural society and ancient kingdom. In the modern society, these data have been used continuously for the legal disputes, construction of buildings and the other areas. This is a good example of pure science data using directly in our life. However there are difficulties to public service because all the data were printed as an Almanac. Using MySQL, we constructed web-based service system which makes to use them easily. This database system was made for the quick search using the calculated orbital data of celestial bodies.

• The Journal of Korean Association of Computer Education
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• v.11 no.5
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• pp.33-45
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• 2008

Field study improves students' capacity for studying and thinking about their surrounding environments. It also develops further interest academic study by allowing them to learn curriculum related materials from actual experience. Moreover, students acquire the capacity for independent and self regulated learning in the course of making efforts to solve problems they face in the environment. Our efforts arc directed at designing and developing a RFID based support system-based on the constructionist's learning theory to help students perform field study more efficiently. The field study support system can be implemented not only in museums but also in botanical gardens, zoos, art galleries, and science centers. Based on the results of the verification at the sample museum we will expand the target locations to implement the field trip support system. We expect that our field study support system will be a catalyst for improving learning in the fields.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.1
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• pp.163-170
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• 2022

This paper introduces a method of extracting facial features due to unrefined inputs in real life and improving the problem of not guaranteeing the ideal performance and speed of the object recognition model through a storage algorithm through weight summation. Many facial recognition processes ensure accuracy in ideal situations, but the problem of not being able to cope with numerous biases that can occur in real life is drawing attention, which may soon lead to serious problems in the face recognition process closely related to security. This paper presents a method of quickly and accurately recognizing faces in real time by comparing feature points extracted as input with a small number of feature points that are not overfit to multiple biases, using that various variables such as picture composition eventually take an average form.

• Education of Primary School Mathematics
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• v.26 no.4
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• pp.317-332
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• 2023

Mathematical modeling activities hold the potential for diverse applications, involving the transformation of real-life situations into mathematical models to facilitate problem-solving. In order to assess the cognitive, affective, and social dimensions of students' engagement in mathematical modeling activities, this study conducted sessions with ten groups of fifth-grade elementary school students. The ensuing processes and outcomes were thoroughly analyzed. As a result, each group effectively applied mathematical concepts and principles in creating mathematical models and gathering essential information to address real-world tasks. This led to notable shifts in interest, enhanced mathematical proficiency, and altered attitudes towards mathematics, all while promoting increased collaboration and communication among group members. Based on these analytical findings, the study offers valuable pedagogical insights and practical guidance for effectively implementing mathematical modeling activities.

• The Journal of Korean Association of Computer Education
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• v.15 no.1
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• pp.33-41
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• 2012

The purpose of this study was to examine the effectiveness of problem-based learning(PBL) of information communication ethics on the problem-solving skills of fifth- and sixth-grade elementary school students about information communication ethics and their attitude. The findings of the study were as follows: First, the PBL-based teaching materials for information communication ethics could serve to stir up the interest of students by letting them face problem situations caused by the disfunction of the information society. Second, a wide variety of teaching-learning activities including cooperative learning and discussion were implemented while the selected students performed the given problem-solving tasks, and the activities had a very good effect on PBL-based information communication ethics education. Third, PBL-based information communication ethics education could be one of effective ways to boost not only the problem-solving skills of students but the teaching interest and capability of teachers.

• Journal of The Korean Association of Information Education
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• v.24 no.5
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• pp.443-451
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• 2020

In elementary school software education, a programming process is experienced through a simple problem solving process. And even this experience emphasizes that the problem-solving process is a CS Unplugged activity. However, CS Unplugged has a disadvantage in that it only learns the principles of computing, and the learner cannot experience real problem solving. In this study, a learning program using artificial intelligence robots was developed with the goal of cultivating the ability to solve problems encountered in the real life of elementary school students. Students could solve complex problems in real life from the point of view of artificial intelligence through the developed program, and increase their interest and understanding of artificial intelligence education through robot control.

• Journal of the Korean Chemical Society
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• v.67 no.1
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• pp.54-63
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• 2023

In this study, six types of 2015 revised curriculum ChemistryII textbooks were analyzed for conditions, definitions, whether or not critical points were displayed, and real-life examples of phase diagram. In this study, it was confirmed that the problems pointed out in several previous studies were not reflected in the 2015 revised curriculum ChemistryII textbook. The same as the situation defining the phase diagram, the translation of the phase diagram into a phase equilibrium diagram, the distinction between phase and state being unclear, the critical point not being shown in the phase diagram, real life examples are very limited what is being presented as is suggested as a problem. Therefore, it is necessary to reflect the results of various previous studies in the revised curriculum ChemistryII textbook that will be made in the future, specify the conditions under which the phase diagram is drawn, newly model the situation defining the phase diagram, and translate the phase diagram as a 'phase diagram'. It is necessary to use the term, clarify the distinction between phase and state, mark the critical point in the phase diagram, and develop various real-life examples.

• Journal of the Korean School Mathematics Society
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• v.12 no.3
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• pp.247-265
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• 2009

In the 21C information-based society, there is an increasing demand for emphasizing communication in mathematics education. Therefore the purpose of this study was to research how properties of communication among small group members varied by mathematical problem types. 8 fourth-graders with different academic achievements in a classroom were divided into two heterogenous small groups, four children in each group, in order to carry out a descriptive and interpretive case study. 4 types of problems were developed in the concepts and the operations of fractions and decimals. Each group solved four types of problems five times, the process of which was recorded and copied by a camcorder for analysis, among with personal and group activity journals and the researcher's observations. The following results have been drawn from this study. First, students showed simple mathematical communication in conceptual or procedural problems which require the low level of cognitive demand. However, they made high participation in mathematical communication for atypical problems. Second, even participation by group members was found for all of types of problems. However, there was active communication in the form of error revision and complementation in atypical problems. Third, natural or receptive agreement types with the mathematical agreement process were mainly found for conceptual or procedural problems. But there were various types of agreement, including receptive, disputable, and refined agreement in atypical problems.

• 한국정보교육학회:학술대회논문집
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• 2010.01a
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• pp.109-116
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• 2010

발달장애 아동의 특성상 교육활동의 효율성을 극대화하기 위하여 구체적인 자료 지원과 실제적인 학습이 가능한 현장체험학습 활동이 요구된다. 그러나 많은 장애요인 및 위험요소로 인해 장애아동의 체험학습이 이루어지기 어렵고, 이미 교실에서 학습된 지식이라 하더라도 실생활의 문제 상황에 적용하는데 어려움을 겪는다. 따라서 본 연구에서는 주어진 상황과 맥락 하에서 스스로 지식을 구성하고 적용하는 상황학습 이론을 기반으로 발달장애 아동의 기초학습 능력 및 사회성 향상을 위한 모바일 현장체험학습 지원 시스템을 설계하였다. 본 모바일 현장체험학습 지원 시스템의 특징은 다음과 같다. 첫째, 발달장애 아동의 구체적이고 실제적인 학습을 위해 현장 체험학습을 활성화 시키고 보다 효과적으로 운영 지원할 수 있다. 둘째, 상황학습 이론을 적용하여 단순한 지식의 습득 차원에서 머무르는 것이 아니라 실제적인 문제 상황에서 지식을 적용할 수 있는 능력을 키울 수 있다. 셋째, 시스템 설계시 장애인의 웹접근성 및 모바일 환경에서의 인터페이스의 특징을 고려하여 설계함으로써 장애아동이 학습 공간에 보다 쉽게 접근할 수 있다. 넷째, 학습 모듈별 반복 학습이 가능하여 발달장애 아동의 기초학습 능력 뿐 아니라 사회적 기능 향상에도 긍정적인 영향을 제공한다.