• Journal of Korean Elementary Science Education
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• v.36 no.4
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• pp.447-460
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• 2017

This study asked preservice elementary teachers to conduct an inquiry of observing the moon, and analyzed the phenomena observed, difficulties experienced, and pedagogical suggestions by the preservice teachers. Participants were 31 undergraduate students enrolled in a science course in a university of education. As a part of the course, the preservice teachers observed the moon for about a month and completed personal journals which described the phenomena they observed, difficulties they experienced, and the pedagogical suggestions to help elementary students conduct the same inquiry activity. The analysis of the journals revealed that the preservice teachers observed the moon mostly during the evening or night and that they noticed lunar phases, directions, altitudes, and color and brightness more frequently than other phenomena. The preservice teachers experienced difficulties related to the observation time, lunar phases, directions, and altitudes, and, reflecting on their own experiences, suggested a variety of pedagogical ideas about these difficulties. The pedagogical suggestions by the preservice teachers also included how to help elementary students keep their interest and perform the moon observation for a rather long period of time. Implications for moon investigations in the elementary school science classroom and relevant research were discussed.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.05a
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• pp.155-158
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• 2008

Development of Moon Explorer-1 (orbiter) is supposed to be commenced in 2017 and launched in 2020. In case of Moon Explorer-2 (lander), it would be slated to start in 2021 and launch in 2025. For this reason it is taken for granted to investigate a fundamental propulsion system for a Moon Explorer. In this paper conceptual feasibility and comparison studies are proposed for the propulsion system applicable to a Moon Explorer. Availability of monopropellant/bipropellant/electric propulsion system is compared and analysed as well with precedents overseas. As a result possible candidates for a Moon Explorer propulsion system are suggested.

• Molecules and Cells
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• v.22 no.2
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• pp.154-162
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• 2006

The entire gene cluster involved in the biosynthesis of angucyclines Sch 47554 and Sch 47555 was cloned, sequenced, and characterized. Analysis of the nucleotide sequence of genomic DNA spanning 77.5-kb revealed a total of 55 open reading frames, and the deduced products exhibited strong sequence similarities to type II polyketide synthases, deoxysugar biosynthetic enzymes, and a variety of accessory enzymes. The involvement of this gene cluster in the pathway of Sch 47554 and Sch 47555 was confirmed by genetic inactivation of the aromatase, including a portion of the ketoreductase, which was disrupted by inserting the thiostrepton gene.

• Annual Conference of KIPS
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• 2014.11a
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• pp.1113-1115
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• 2014

본 프로젝트팀에서 개발한 'VTK'(Virtual Training by Kinect)는 아이부터 노인까지 모든 연령이 이용 가능한 기능성 게임으로써 동작인식 컨트롤러인 키넥트를 이용하여 불필요한 장비가 없이 동작인식을 통해 인터페이스가 가능하게 했다. 주요기능은 평가와 트레이닝, 통계분석 세 가지로 이루어져 있다. 사용자는 6분 걷기와 폐안시 외발서기를 통해 개인별 심폐지구력과 평형감각 수준을 알 수 있으며 조깅과 인라인 스케이트를 통해 기능 향상을 위한 트레이닝을 할 수 있다. 통계분석은 별도의 용용프로그램을 통해 확인 할 수 있다. 성장하고 있는 기능성 게임 시장에 새로운 방향성 제시를 목표로 하였다.

• Annual Conference of KIPS
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• 2014.11a
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• pp.1187-1190
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• 2014

현재 지구온난화로 인해 기후가 급변하고 있다. 이러한 자연적 현상 때문에, 만약 기존의 농업환경에서 농부의 체험적이거나 농사에 적합하지 않은 기상정보에 의존하여 농사를 경영한다면 농산물에 대한 일정수준의 생산량을 얻기 힘들 것이며 변동적인 수익을 얻게 될 것이다. 이를 방지하기 위해 본 연구에서는 시뮬레이션이 가능한 솔루션을 제공하여 병해충 피해를 줄이고자 한다. 또한, 농작물을 3D 와 VSTO(Visual Studio Tools for Office)로 시각화하고, 해당 기상정보 데이터를 사용자가 임의로 사용할 수 있게 제공하고자 한다. 특히, 본 논문에서는 기상청에서 획득한 실험적 데이터로 고추 작물을 활용하여 시스템을 구현하고자 한다. 이를 통해, 농민들이 가상 속에서 작물을 심어 볼 수 있는 환경을 이루고자 한다.

• Annual Conference of KIPS
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• 2012.04a
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• pp.94-97
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• 2012

파일관리 시스템은 운영체제와 네트워크의 변천에 따라 다양한 변화롤 가져 왔다. 클라우드 서비스는 사용자가 효과적으로 파일 관리를 할 수 있도록 다양한 기능이나 새로운 파일 관리 방법을 제공하고 있다. 개인용 윈도우 역시 시대의 변화에 맞추어 다양한 기능을 제공하고 있지만 기본적인 폴더 시스템은 변화하지 않았다. 특히 파일의 분류가 애매한 경우 개인용 윈도우에서는 편리하게 이러한 파일을 분류하거나 관리할 방법을 제공해주고 있지 않다. 개인용 윈도우에서도 더 효과적 으로 파일을 관리할 수 있도록 다양한 파일 관리 방법을 제공하도록 파일 관리 시스템을 개선한다. 본 프로젝트는 사용자 편의성을 높여주기 위하여 윈도우에서 제공되지 않는 카테고리나 태그와 같은 개념을 도입하여 사용자의 파일관리나 검색 등을 쉽고 빠르게 할 수 있도록 도우며, 파일의 공유 및 보안을 쉽게 할 수 있는 기술 요소롤 제공한다. 개선된 파일 관리 시스템의 필수요소인 보안 시스템과 검색 시스템 및 효과적인 파일 분류 시스템을 지원하는 프로토타입을 구현하고 소개한다.

• Journal of Microbiology and Biotechnology
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• v.29 no.2
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• pp.268-273
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• 2019

The specificity of a Bacillus licheniformis uridine diphosphate (UDP) glycosyltransferase, YjiC, was increased towards thymidine diphosphate (TDP)-sugar by site-directed mutagenesis. The Arg-282 of YjiC was identified and investigated by substituting with Trp. Conversion rate and kinetic parameters were compared between YjiC and its variants with several acceptor substrates such as 7-hydroxyflavone (7-HF), 4',7-dihydroxyisoflavone, 7,8-dihydroxyflavone and curcumin. Molecular docking of TDP-glucose and 7-HF with YjiC model showed pi-alkyl interaction with Arg-282 and His-14, and pi-pi interaction with $His^{14}$ and thymine ring. YjiC (H14A) variant lost its glucosylation activity with TDP-glucose validating significance of His-14 in binding of TDP-sugars.

• The Journal of Korean Physical Therapy
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• v.35 no.6
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• pp.185-189
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• 2023

Purpose: This study investigated the immediate biomechanical effects of unilateral mastication for 10 minutes on the temporomandibular joint (TMJ) with 21 healthy adult participants. Methods: The gum group chewed gum on the right side for 10 minutes, and the control group rested for 10 minutes. Biomechanical data were obtained using a three-dimensional infrared camera before and after intervention. An independent t-test assessed the variation of kinematic data to identify differences between before and after intervention. Results: Among biomechanical variables, the gum group's length of the left forehead middle region and the temporomandibular joint angle decreased compared to the control group (p<0.05). Conclusion: Caution with unilateral masticatory activity is recommended, as unilateral mastication causes biomechanical changes due to excessive load on the soft tissues of the contralateral TMJ.

• Journal of The Korean Association For Science Education
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• v.29 no.8
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• pp.874-885
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• 2009

The purpose of this study is to analyze illustrations, contents, and experiments in 6 kinds of science textbook from the 9th grade covering the phases of the Moon (on the phases of the Moon in six 9th grade science textbook) and to suggest coherent and effective contents and frame of the science textbook. Hence, the researcher decided the study problem. The study problems are as follows; 'Are the illustrations in the science textbook presented to help understand the phases of the Moon depending on the position of the observer?', 'Does the contents of the book clearly mention the phases of the Moon?', 'Can students understand the phases of the Moon through the experiments in the science textbook?', 'Do illustrations, contents, and experiment of the science textbook consistently explain the phases of the Moon?'. 10 persons (9graduate students including the researcher) took part in this study. All things unanimously agreed upon by all participants were reflected in the results. The results are as follows: First, the universal observer's view point is mixed with the earth observer's view in the illustration of these science textbook regarding the phases of the Moon. Moreover, illustrations of some textbooks are presented with such words as 'sunrise', 'midnight' and consequently contain too much. Second, the contents of the science textbook concerning the phases of the Moon is not described clearly. In addition, they don't give clear and detailed explanations for the reason of these changes. Third, all of the textbooks, except one textbook, describe the experiment regarding the phases of the Moon with the earth observer's view point but don't specifically mention that the view point is that of the earth observer's view point. Fourth, illustrations, contents, and experiments in the science textbook don't coherently explain the phases of the Moon. In addition, it is confirmed through the process of the result analysis that the described contents in the science curriculum is not well constructed or logical.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.194-194
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• 2009

본 논문에서는 선박 내에서 네트워크로 연결된 수많은 임베디드 장비들의 상태정보들을 수집 분석하고, 각종 장비들 간의 데이터 상호교환으로 발생하는 통신 버틀렉 등을 분석할 수 있는 선박 임베디드 장비 모니터링 도구에 대하여 기술하였다.