• Bulletin of the Korean Chemical Society
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• 제31권12호
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• pp.3740-3744
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• 2010

A typically designed 'Peptide Lego' has two distinct surfaces: a hydrophilic side that contains the complete charge distribution and a hydrophobic side. In this article, we describe the fabrication of a unique lego-type peptide with the AEAEYAKAK sequence. The novel peptide with double amphiphilic surfaces is different from typical peptides due to special arrangement of the residues. The results of CD, FT-IR, AFM and DLS demonstrate that the peptide with the random coil characteristic was able to form stable nanostructures that were mediated by non-covalent interactions in an aqueous solution. The data further indicated that despite its different structure, the peptide was able to undergo self-assembly similar to a typical peptide. In addition, the use of hydrophobic pyrene as a model allowed the peptide to provide a new type of potential nanomaterial for drug delivery. These efforts collectively open up a new direction in the fabrication of nanomaterials that are more perfect and versatile.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.655-657
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• 2014

본 논문은 클라우드 서비스를 위한 초고화질 영상 송수신 미디어 플랫폼인 레고형 UHD(Ultra High Definition) 미디어 플랫폼을 제안한다. 이 플랫폼을 이용하면 옥/내외 환경에서 UHD 영상을 이용할 수 있는 클라우드 서비스를 자유롭게 공유할 수 있고, 차세대 무선 통신기술(802.11ac, LTE Broadcast 등)이 적용된 다양한 미디어 제품과 제안된 플랫폼을 활용한다면 누구나 손쉽게 개발시킬 수 있으며, 다양한 비즈니스 모델에 적용할 수 있어 새로운 시장과 산업 창출을 기대 할 수 있을 것으로 생각한다.

• 한국생활과학회지
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• 제23권1호
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• pp.31-46
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• 2014

This study investigated the proceeding patterns of constructive play with lego blocks, and the differences on the quality of constructive play and symbolic play's pretending elements. The subjects were 132 children at child care centers and kindergarten: 64 three-year-olds (36 boy, 28 girl) and 68 five-year-olds (32 boy, 36 girl). The study found three proceeding patterns in the constructive lego play. First, children engaged in constructive and symbolic play simultaneously, or they switched back and forth between symbolic and constructive play. This pattern was termed as "constructive and symbolic play simultaneously or alternatively"(type 3), and it was occurred most frequently. Secondly, children focused only on constructing structures. This pattern was termed as "constructive play only"(type 1), Thirdly, children engaged in symbolic play only after they completed building some structures. This pattern was named "symbolic play after constructive play"(type 2). The findings also indicated that children who were categorized as type 1 and 2 showed higher quality of constructive play and longer duration in play than children as type 3. Five-year-old children sustained play longer and showed higher quality in terms of elaboration, imagination, and variety (number of blocks, shape of blocks). Furthermore, children as type 3 showed a higher level of imaginative play than children as type 1 and 2, especially in terms of role, objet, and context of projection.

• Nuclear Engineering and Technology
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• 제43권4호
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• pp.399-404
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• 2011

A LEGO-type multi-purpose dosimetry phantom was developed for intensity-modulated radiation therapy (IMRT), which requires various types of challenging dosimetry. Polystyrene, polyethylene, polytetrafluoroethylene (PTFE), and polyurethane foam (PU-F) were selected to represent muscle, fat, bone, and lung tissue, respectively, after considering the relevant mass densities, elemental compositions, effective atomic numbers, and photon interaction coefficients. The phantom, which is composed of numerous small pieces that are similar to LEGO blocks, provides dose and dose distribution measurements in homogeneous and heterogeneous media. The phantom includes dosimeter holders for several types of dosimeters that are frequently used in IMRT dosimetry. An ion chamber and a diode detector were used to test dosimetry in heterogeneous media under radiation fields of various sizes. The data that were measured using these dosimeters were in disagreement when the field sizes were smaller than $1.5{\times}1.5\;cm^2$ for polystyrene and PTFE, or smaller than $3{\times}3\;cm^2$ for an air cavity. The discrepancy was as large as 41% for the air cavity when the field size was $0.7{\times}0.7\;cm^2$, highlighting one of the challenges of IMRT small field dosimetry. The LEGO-type phantom is also very useful for two-dimensional dosimetry analysis, which elucidates the electronic dis-equilibrium phenomena on or near the heterogeneity boundaries.

• 한국멀티미디어학회논문지
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• 제9권10호
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• pp.1344-1353
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• 2006

디지털과 디자인의 접목이라는 사회적 가치에 부합하는 제품의 측면에서, 최근 사용자층의 차장과 디자인 혁신을 꾀하면서 다양한 방식으로 디지털기술과의 융화를 시도하고 있는 브릭 완구에 대한 중요성이 나날이 높아지고 있다. 브릭에 대한 기존의 연구는 아날로그 측면의 놀이와 교육 도구로서의 역할에 치중함으로써 실제로 그 가치 이외의 무한한 가능성과 멀티미디어 측면에서의 확장성에 관한 연구가 부족한 것이 사실이다. 본 연구는 점차 사용성이 확대되고 있는 브릭 시스템 완구가 어떤 방식으로 진화되었는가에 대한 문제 제기에서 출발하여 브릭에 관한 기본적 이론 연구와 구체적 사례 분석을 통해 변화된 현황을 살펴보는 것으로 이루어져 있다. 이를 토대로 최종적으로는 확장된 형식의 대표적 브릭 시스템 사례를 적용한 디자인 프로세스를 수행함으로써 디지털 브릭 시스템의 가능성을 보다 체계적으로 보여 줄 수 있을 것으로 기대한다.

• 전자공학회논문지
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• 제54권7호
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• pp.127-132
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• 2017

이 논문에서는 모델 기반 설계에 근거한 이륜 도립진자 로봇의 제어이득을 설계하고 NXT 마인드스톰과 RobotC 언어를 이용하여 수업에 활용 가능한 로봇을 제작 및 실험한다. 이륜 도립진자 로봇은 NXT 마인드스톰, 서보 직류전동기, 자이로 센서, 가속도 센서로 구성된다. 직류전동기에 내장된 엔코더를 이용하여 바퀴의 회전각을 검출하며 이동평균을 이용하여 바퀴의 회전각속도를 계산한다. 자이로 센서는 몸체의 피치 각속도를 측정하며 가속도 센서는 몸체의 피치 각도를 측정한다. 자이로와 가속도의 센서 융합을 통해 몸체 각도를 계산한다. 제어기 이득 요소는 휠 각도, 휠 각속도, 몸체 피치 각도, 몸체 피치 각속도에 대한 가중치이다. 이들 제어이득의 변화에 따른 도립진자 로봇의 변화를 실험하며 유용성을 확인한다.

• 한국수학교육학회지시리즈A:수학교육
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• 제53권3호
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• pp.413-434
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• 2014

Logic lays the foundation of Mathematics and the development of Mathematics is dependent on critical thinking. So it is important that school mathematics helps students develop their logical and critical thinking ability for both mathematics learning and problem solving in general. MINDSTORMS, a LEGO based programming activity kit, is an effective teaching and learning tool that can be used to enhance logical and critical thinking in students. This study focused on measuring the growth of students' ability to think logically and critically when they used MINDSTORMS activities to learn programming. In addition, we investigated how the students' logical and critical thinking changed from the MINDSTORMS learning experience. The study confirmed that the programming activities using MINDSTORMS help to enhance logical and critical thinking in students. The students attitude about logical and critical thinking became more positive and the activities helped to engage students to think logically and critically. This type of programming activities should be valuable in mathematics education and it should be included in a general mathematics curriculum.

• 한국멀티미디어학회논문지
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• 제10권9호
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• pp.1175-1184
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• 2007

기초적인 조형 교구인 브릭 제품이 현재는 사용자 계층의 확장에 성공하며, 특유의 가변성과 타 분야와의 뛰어난 연계성을 장점으로 다양한 분야와 독창적인 방식으로의 접목을 시도하고 있다. 하지만 실제로 브릭에 대한 기존의 연구는 그 가치이외의 무한한 가변성과 다변화 차원에서의 연구가 부족하다. 본 연구는 이 같은 인식하에 브릭의 본질적 속성에 관한 이론적 근거를 기반으로 보다 진화한 미래형 브릭 시스템의 현황을 제시하고 체계적으로 분석하는 방식으로 진행하였다. 최종적으로는 3D브릭시스템을 활용한 VR 디자인을 구현해보는 프로세스를 수행하였다. 브릭 시스템의 '다변화 및 확장성'에 관한 연구는 브릭의 미래적 가능성과 활용성을 파악하는데 중요한 자료를 제공 할 것이다.

• 공학교육연구
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• 제26권1호
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• pp.37-44
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• 2023

Recently, the Internet of Things is attracting attention as an important key technology of the 4th Industrial Revolution, and SW education using physical computing is suggested as a good alternative to supplement the problems raised by beginners in programming education. Among the many teaching tools that can be used for physical computing education, MODI is a modular manufacturing tool that anyone can easily assemble like Lego. MODI is a teaching tool that can improve learners' achievement by linking a self-linked block-type code editor called MODI Studio to lay the foundation for programming in a relatively small amount of time and immediately check the results in person. In this paper, a physical computing education method using MODI was designed to be applied to basic programming courses for programming beginners and applied to after-school classes for middle school students. As a result, it was found that students' interest and satisfaction were much higher in physical computing classes using MODI than in text-based programming classes. It can be seen that physical computing education that allows beginners to see and feel the results in person is more effective than grammar-oriented text programming, and it can have a positive effect on improving basic programming skills by increasing students' participation.

• 한국인공지능학회지
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• 제11권4호
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• pp.15-20
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• 2023

Machine learning is comprised of supervised learning, unsupervised learning and reinforcement learning as the type of data and processing mechanism. In this paper, as input and output are unclear and it is difficult to apply the concrete modeling mathematically, reinforcement learning method are applied for crawling robot in this paper. Especially, Q-Learning is the most effective learning technique in model free reinforcement learning. This paper presents a method to implement a crawling robot that is operated by finding the most optimal crawling method through trial and error in a dynamic environment using a Q-learning algorithm. The goal is to perform reinforcement learning to find the optimal two motor angle for the best performance, and finally to maintain the most mature and stable motion about EV3 Crawling robot. In this paper, for the production of the crawling robot, it was produced using Lego Mindstorms with two motors, an ultrasonic sensor, a brick and switches, and EV3 Classroom SW are used for this implementation. By repeating 3 times learning, total 60 data are acquired, and two motor angles vs. crawling distance graph are plotted for the more understanding. Applying the Q-learning reinforcement learning algorithm, it was confirmed that the crawling robot found the optimal motor angle and operated with trained learning, and learn to know the direction for the future research.