• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.1380-1382
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• 2021

기존의 항만 유지보수 교육 및 훈련 시스템의 단점을 극복하기 위해 최근 주목받고 있는 unity3D 엔진 및 챗봇, 가상현실 기술, 실시간 서버, 사용자 분석 웹사이트, 멀티플레이 기능을 활용하여 작업자들이 시간과 장소의 제약 없이 더욱 현실감 있는 환경에서 효율적으로 교육받을 수 있는 환경을 제공하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.9
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• pp.3277-3283
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• 2010

In this study, in order to find effects of collagen manipulation on hair in permanent wave treatment, it was conducted measurement and analysis on hair curl formation, thickness, tensile strength, methylene blue absorbance, and moisture loss after manipulating concentration proportion of collagen in permanent wave treatment on normal hair. As a result, it was found that by contrast with applying the reductant, hair thickness, tensile strength, methylene blue absorbance, and moisture loss were decreased when applied collagen in permanent wave treatment the higher concentration proportion of collagen was applied, the less damage was occurred on hair However curl formation capacity was decreased in permanent wave treatment as concentration proportion of collagen was increased. Therefore, the appropriate concentration proportion of collagen was 2% in order to reduce hair damage in permanent wave treatment.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.6
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• pp.899-905
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• 2013

In this paper, we focus on how to calibrate multi-cameras easily and how to efficiently detect quad-copters with small-numbered particles. Each particle is a six dimensional vector that is composed of 3D position and 3D orientation of a quad-copter in the space. Due to curse of dimensionality, that leads to explosive computational costs with a large amount of high-dimensioned particles. To detect efficiently, we need to put more particles in very promising spaces and few particles in other spaces. Though computational cost is lowered by minimizing particles, in order to track a quad-copter with multiple cameras in real-time, multiple images from the cameras should be synchronized and analyzed. Therefore, lots of the computations still need to be done. Because of this, GPGPU(General-Purpose computing on Graphics Processing Units) is implemented for parallel computing. This method has been successfully tested and gives accurate results in practical situations.

• The Journal of the Korea Contents Association
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• v.11 no.4
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• pp.33-41
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• 2011

Although conventional text-based passwords are used as the most common authentication method, they have significant drawbacks such as guess attacks, dictionary attacks, key loggers, and shoulder-surfing. To address the vulnerabilities of traditional text-based passwords, graphical password schemes have been developed as possible alternative solutions, but they have a potential drawback that they are more vulnerable to shoulder-surfing than conventional text-based passwords. In this paper, we present a new Hangul password input method to prevent shoulder-surfing attacks. Our approach uses Hangul as a password, and it requires the users to locate their password in the given wheeling password grid instead of entering the password. Our approach makes it difficult for attackers to observe a user's password since the system shows the users' passwords with decoy characters as the noise on the screen. Also, we provide security analysis for random attacks, dictionary attacks, and shoulder-surfing attacks, and it shows that our password system is robust against these attacks.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.43 no.4
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• pp.304-310
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• 2015

Pintle thrusters use pintle stroke to change nozzle throat area, and this controls thrust. Using MATLAB, one-dimensional simulation has been investigated and the results are compared to those of cold flow tests and computational fluid dynamics for the pintle thruster of Chungnam National University. The prediction based on one-dimensional flow theory shows good agreement with measurements for chamber pressure, but deviates for thrust, partly because of nozzle wall separation. Computational results show that nozzle wall separation occurs at an early stage of nozzle expansion, near the design nozzle throat, for the course of pintle strokes. Empirical thrust prediction incorporates nozzle wall separation, and thus 1-D simulation using empirical thrust prediction showed good results for an early stage of pintle stroke.

• The Journal of Korean Association of Computer Education
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• v.19 no.2
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• pp.87-98
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• 2016

Our study is composed of Arduino robot assembly, board connecting and collaborative programming learning, and it is to evaluate their effect on improving secondary mathematics-science gifted students' convergence capability. Research results show that interpersonal skills, information-scientific creativity and integrative thinking disposition are improved. Further, by analyzing the relationship between the sub-elements of each thinking element, persistence and imagination for solving problems, interest of scientific information, openness, sense of adventure, a logical attitude, communication, productive skepticism and so on are extracted as important factors in convergence learning. Thus, as the result of our study, we know that gifted students conducted various thinking activities in their learning process to solve the problem, and it can be seen that convergence competencies are also improved significantly.

• The Journal of Korean Association of Computer Education
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• v.19 no.2
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• pp.31-40
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• 2016

Textbook is a tool that helps achieve the learning objectives based on the content of the curriculum. The contents of the textbook will be constructed newly because revised curriculum 2015 was announced. The aim at this study is to provide an indication of the textbook writing. To achieve the objectives, we conducted a pilot study in order to analyze the content of the textbook of informatics currently being used in middle schools and to derive the direction of access to the newly configured physical computing unit. Analysis of content elements was used Romey. The pilot studied makes lesson harmonized with H/W and S/W by utilizing the robot. According to the results of the analysis, there is one textbook among the currently used textbooks that is suitable to help students develop their thinking and in the case of physical computing unit, inquiry instruction showed positive results. This study suggestions necessity of writing types that sets importance on activities in the form of textbook.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.1
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• pp.165-172
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• 2017

Recently, many supports about the education linked with industrial field have been provided in technical specialized high schools. In order to keep pace with the global trend to emphasize software education and to move away from traditional grammar-based programming learning, various physical computing tools have been used in the education fields. For this study, we conducted a programming class using Raspberry Pi for technical high school students. In the class, students were instructed to produce actual results based on the knowledge they had learned. Project-based learning was used to help students create products and thus they performed tasks while discussing and collaborating on a team-by-team basis. In particular, self-regulation learning strategies were considered to provide effective project-based instruction. After the class, we interviewed the students' satisfaction with it. The results showed that the students' satisfaction was high, and the fellow teachers also had a lot of possibilities and expectations about the programming instruction and project-based learning using Raspberry Pi.

• The Journal of the Korea Contents Association
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• v.13 no.11
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• pp.924-934
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• 2013

Traditional village forests in the Jeju Island represent unique cultural landscape with a history of more than several hundred years as a national cultural asset in Korea. There are 368 Oreums, parasitic volcanoes, and 391 shrines of Dang(Divine place) in Jeju. Currently, the shrines of Dang are damaged by the Jeju Olle trail path and road constructions. It's time for cultural consents to be obtained with locality and globality. And need to produce our own unique contents, glocal cultural contents. In this study, the establishment of trail path of Jeoji Oreum in relation to the Dang in the Jeju Island was investigated. By linking the Dangsan forest to the Jeoji Oreum trail path, it enables the path to contact with traditional cultural landscape. Rural villages in Jeju with the Oreum and Dang are expected to get an international attention as to have traditional cultural landscapes of Korea. It needs to be managed to retain their original form and in connection with the trail path.

• International Journal of Highway Engineering
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• v.10 no.4
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• pp.171-180
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• 2008

This study was conducted to analyze the curling behavior of concrete slabs on grade under temperature loading through the laboratory tests and to investigate the effects of the support conditions of underlying layers on the curling behavior of the slab on grade systems. For the laboratory tests, the concrete slabs were fabricated and the temperature measurement sensors were installed. The temperature loading was applied intentionally and the time histories of the vertical displacements of the slab at several different positions were measured. One-layered underlying layers were made using different materials and different thicknesses. Two-layered underlying layers were also made to have the same composite stiffness each other, but the material of the upper layer was designed to be different The experimental analysis results showed that the trend of the displacement time histories of the slab was basically the same as that of the temperature gradient time histories. The characteristics of the curling behavior of the slab were analyzed by separating the regions of curling up and curling down. The difference in the vertical displacements at the center and comer decreased as the stiffness of the underlying layer became larger, and the upper layer's material of the underlying layers affected the curling behavior of the slab.