• Journal of Environmental Science International
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• v.22 no.7
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• pp.811-821
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• 2013

A purpose of this study was to provide the helpful information about operation of revised science curriculum by analyzing many contents about acid rain with various aspects, which was written in science textbook of 10 year according to the 7th national curriculum. The results show that there was the lack of educational systemicity among elementary school, middle school, and high school science curriculum and the lack of explanation for occurrence and standard level of acid rain, pH 5.6. And It could be categorized the effect of acid rain into four groups and experiment or experiment activities into three groups.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.11a
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• pp.91-93
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• 2015

본 논문에서는 4K UHD(Ultra High Definition) 방송 수신기의 비디오 표준적합 및 에러 처리 평가를 위한 비디오 시험 스트림을 제안한다. 표준적합 시험 스트림은 4K UHD 방송 수신기의 비디오 압축 표준인 HEVC/H.265 의 표준 적합 여부를 판단하기 위해 사용이 가능하며, 에러 처리 평가 스트림은 비디오 스트림 내에 에러가 발생하였을 때 수신기가 에러를 처리하는 방식을 검증하기 위하여 사용 가능하다.

• Korean Journal of Computational Design and Engineering
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• v.8 no.2
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• pp.122-132
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• 2003

STEP AP218 has a standard schema to represent the structural model of a midship section. While it helps to exchange ship structural models among heterogeneous automation systems, most shipyards and classification societies still exchange information using 2D paper drawings. We propose a feature parameter input method to generate a 3D STEP model of a ship structure from 2D drawings. We have analyzed the ship structure information contained in 2D drawings and have defined a data model to express the contents of the drawing. We also developed a QUI for the feature parameter input. To translate 2D information extracted from the drawing into a STEP AP2l8 model, we have developed a shape generation library, and generated the 3D ship model through this library. The generated 3D STEP model of a ship structure can be used to exchange information between design departments in a shipyard as well as between classification societies and shipyards.

• Research in Mathematical Education
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• v.10 no.3 s.27
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• pp.215-227
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• 2006

After reviewing China's appearance and research on the Math open-ended problems, together with the application of those problems in mathematics test of Shanghai Senior Middle School Entrance Exams (SSMSEE) since 1999, this paper points out the difficulty in establishing an evaluation system for such problem. Through comparative study, the paper gives an operational definition of open-ended problem, and it attempts to establish an evaluation system and non-systematic competence targets that are appropriate to Math open-ended problems. Meanwhile, it describes the performance feature of those targets. By applying the standard international grading system of difficulty, it discusses the elements of difficulty in Math open-ended problems, and puts forward an evaluation as well as a level-of-difficulty forecasting system that is appropriate to the Middle School Entrance Exam.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.11a
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• pp.525-528
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• 2006

Recently, Korea government prepared Act on facilitation of construction waste recycling in December 2003 for effective recycling of rapidly increasing construction wastes, and has enforced the Act on Jan. 2005. This Act limits the definition of recycled aggregates to the aggregates which obtained quality certificate and for this purpose, government has operated quality standard and certificate system of recycling aggregate. The objective of this experimental study is to evaluate the mechanical properties of recycled coarse aggregate concrete according to curing method by ready-mixed concrete. Compressive strength ratio of recycled aggregate concrete under air-dry curing/wet curing was $74{\sim}91%$. KCI code for conventional concrete overestimated elastic modulus for recycled coarse aggregate concrete.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.3
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• pp.577-583
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• 2011

In AC-PDP, it is necessary to achieve high luminance efficiency, high luminance and high definition by adopting technologies such as high xenon concentration and long gap. However, it is very difficult to apply above technologies because they make many problems such as mis-discharge and high driving voltage. Especially, the reactive power of PDP must be reduced for satisfaction in international standard IEC62087. In this paper, we proposed CLHS driving method which is half sustain driver without energy recovery capacitor. In the experimental results, CLHS driving method reduced reactive power consumption about 10%. Also, CLHS driving method improved the luminance efficiency in all discharge loads. Therefor, the more the discharge load decreases, the more the luminance efficiency improves. When the discharge load is 20%, CLHS driving method improved 5.35%.

• Journal of the Korean Society of Safety
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• v.27 no.6
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• pp.160-165
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• 2012

The process of panel line in the shipyard produce the panel of outside planking which is located the side and bottom of a ship. The stiffeners or plates are welded onto the plates in this process. In this study, the panel line was performed to work process analysis and was analyzed into the IDEF0(Integration Definition) model that is functional modeling methodology. Also the panel line was analyzed to find out the risk factor and expected accident/safety guide from each process. And then this outputs were applied to the IDEF0 model. The mobile application which is designed by ooCBD(Object-oriented Component Based Development) method is able to use the output data of the process analysis in the panel line. This mobile application could be used by employees and safety managers without regard for working location and time.

• Journal of information and communication convergence engineering
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• v.17 no.4
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• pp.234-238
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• 2019

Existing web applications and services have historically been implemented using JavaScript. However, new technologies such as artificial intelligence, the Internet of Things, and Big Data are being developed as part of the Fourth Industrial Revolution. With the definition of the HTML5 web standard, services (such as the technologies mentioned above) that were previously not available through the Web become available. These services, however, need to have the same performance as native applications, and implementing these services will require new technologies. Therefore, additional tools that can work on the Web with native performance are needed. In this paper, a system for branching processing was established using JavaScript and WebAssembly, a language that can operate on the Web. This system performs user requests in advance, and requests are branched in a language that produces faster results. Therefore, a service capable of quick response times can be implemented.

• Proceedings of the KAIS Fall Conference
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• 2000.10a
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• pp.134-139
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• 2000

컴퓨터의 보급 확대, 초고속 통신망 구축 그리고 사용하기 쉬운 브라우저의 개발에 힘입은 웹의 급속한 발전에 의해 인터넷 이용자들이 기하급수적으로 증가하게 되었다. 이러한 웹의 발전에 무엇보다도 크게 영향을 끼친 것 중의 하나가 바로 HTML(Hyper-Text Markup Language)일 것이다. HTML은 SGML(Standard Generalized Markup Language)을 기반으로 한 DTD(Document Type Definition)에 의해 정의되어 있는 한정된 태그(Tag)만을 사용하도록 되어 있어 단순한 홈페이지 작업을 하기에는 매우 용이하나 대용량의 복잡하고 다양한 작업을 하기는 쉽지 않았다. HTML의 단점을 극복하기 위해 개발된 XML은 문서에 대한 의미 공유와 서로 다른 애플리케이션 및 호환이 되지 않는 데이터베이스간의 정보 전달 기능들을 효율적으로 수행할 수 있다. 하지만, 현재 대부분의 XML문서 검색 엔진들은 문서의 구조 정보에 기반한 검색에 중점을 둔 반면, 태그의 의미를 이용한 검색은 지원하지 못한다. 본 논문에서는 XML문서의 보다 효율적인 검색을 지원하기 위해 데이터 레지스트리를 이용하여 태그의 의미를 명시하고 이에 기반한 XML문서 검색 시스템을 연구하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10b
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• pp.257-259
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• 2000

다양한 전자문서를 효율적으로 처리하기 위해서는 구조문서 정의가 가능한 SGML(Standard Generalized Markup Language)이나 XML(eXtensible Markup Language)을 이용할 수 있다[1,2]. SGML 및 XML과 같은 구조문서를 생성하기 위해서는 별도의 편집기가 필요하며 현재 다양한 제품이나 연구결과를 살펴볼 수 있다[3,4]. 그러나 기존의 입력, 편집 시스템에서는 사용자가 작성하려는 문서에 대한 구조를 숙지하여야 하는 동시에, DTD(Document Type Definition)에 대한 지식을 필요로 한다. 이를 인해 복잡한 구조의 SGML 및 XML 문서를 일반인들이 사용하기 어렵고, 작성한 결과에 대한 검증 과정이 필수적으로 요구된다. 또한 다양한 분야에서 적용 가능한 전자문서 시스템을 위해서는 효과적인 통합 DTD의 정의와 처리 방법이 필요하다. 따라서 본 논문에서는 구조화 문서에 대한 지식이 없는 일반인들도 쉽게 구조문서 작성이 가능하며, 통합적 DTD의 효율적인 처리가 가능한 Form 기반 편집 시스템의 모델을 제시하며, 특히 웹에서도 적용이 가능한 XML을 지원한다. 그 결과 본 연구에서 개발한 XML 편집 시스템은 Form 기반의 통합 DTD 처리와 XML 문서 작성 및 출력 기능, 그리고 이미지, 테이블 기능 등을 제공함으로써 누구나 쉽고 정확한 XML 문서를 작성할 수 있다.