• 과학교육연구지
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• 제34권1호
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• pp.84-92
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• 2010

본 연구에서는 유 초 중등 및 일반인을 대상으로 개발된 환경교육 교수 학습 자료의 유형과 내용을 분석하고, 또한 학교 급간별로 어떠한 특징이 있는지 분석하였다. 전반적으로 웹기반 멀티미디어 학습자료가 포함하고 있는 환경교육 내용 영역은 자연 환경 304건(22.1%), 환경 오염 250건(16.5%), 환경보전대책 187건(12.4%)으로 이들 영역에 치중되어 있었다. 교수 학습 자료 유형은 수업지도안(934건, 61.8%), 다큐멘터리(156건, 10.3%), 정보문자(128건, 8.5%) 등이 가장 높은 비중을 차지하고 있었다. 학교급간별 멀티미디어 교수-학습 자료를 분석한 결과 초등학교(796건, 35.3%)와 중학교(588건, 26.1%)에 치중되어 있는 것으로 나타났으며 일반인을 대상으로 하거나 고등학생을 대상으로 한 학습 자료는 부족한 것으로 나타났다. 세계적으로 환경교육의 내용이 전통적인 환경 오염 문제 중심에서 벗어나 지속가능 교육(ESSD)을 특히 강조하며, 그 외에 생태계, 인간과 자연과의 관계, 건전한 소비 등으로 확대되는 추세를 감안하여 시대적 요구를 반영한 다양하고 균형 있는 교육 자료가 개발될 필요가 있다.

• International Journal of Aeronautical and Space Sciences
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• 제9권1호
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• pp.137-146
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• 2008

Proper amount of entrained air and nip force should be also considered to minimize ballooning phenomenon since tight contact between a roller and web is required. In this paper, various web materials, PET(Polyester) and OPP(Oriented Poly Propylene) have been selected and investigated to satisfy high-speed printing requirement. Several web speeds, web tensions, and temperature conditions are imposed on each web materials and the pressure and gap profiles as well as nip force have been calculated. Increase of both the winding roller radius and the incoming wrap angle is considered under proper taper tension at 500 m/min of rewinding roller. By solving coupled Reynolds equation and web deflection equation simultaneously, the fluid-structure interaction process has been developed and is applied to the rewinding roller to investigate the ballooning phenomenon which causes guiding problems in high-speed printing performance conditions. By adjusting the linear taper tension, stress distribution between rewinding webs can be remarkably reduced and stable pressure and gap profile with ignorable ballooning phenomenon have been found.

• 정보교육학회논문지
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• 제4권1호
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• pp.57-71
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• 2000

일반적으로 웹기반 수업이 전 교과에 걸쳐 전개되고 있는 바, 다양한 WBI 자료를 교과특질에 맞게 특성화하는 일 또한 간과해서는 안 되는 중요한 수업현장의 과제이다. 따라서 웹기반 지역화 학습자료 개발이라는 당면과제를 사회과에서 해결하고자 하는 시도로써 본 연구를 추진하게 되었다. 전국 각 지역마다 '사회탐구'라는 별책교재를 개발하여 Text위주의 지역화 학습을 지도하고 있는데 이를 개선하는 노력으로 WBI 지역화 자료개발 모델을 제시하였다. 이를 바탕으로 우리고장의 생활모습 등의 다양한 내용을 WBI 자료화하여 학교 홈페이지에 올려 활용 지도하였다. 그 결과 Text위주의 교재감각에서 벗어나 역동적인 멀티미디어 환경인 지역화 웹페이지를 만남으로서 학생들의 자기 주도적 학습 능력 및 문제해결 능력이 신장되었다.

• 한국항공우주학회지
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• 제48권12호
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• pp.953-960
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• 2020

본 논문은 회전익기용 엔진 감속기 주 기어열의 기어 웹 형상 최적화에 대해 기술하였다. 최적화 목표는 총중량, 전달 오차, 정렬 오차, 치면 하중 분포 계수 값의 최소화로 설정하였으며, 기어의 웹 두께, 웹과 축의 연결 위치, 웹과 림의 연결 위치를 설계변수로 선정하였다. 최적화 과정에서 기어의 웹, 축, 림은 3D 캐드 모델로부터 유한요소 모델로 변환되었으며, 기어 해석 프로그램 MASTA에 입력되었다. 최적화 알고리즘은 NSGA-II를 사용하였다. 최적화 결과 주 기어열의 총중량, 전달 오차, 정렬 오차, 치면 하중 분포 계수 값은 모두 감소하였으며, 최대 응력도 안전한 수준으로 나타나서 전반적으로 기어 성능이 개선되었음을 확인하였다.

• Journal of the Korean Wood Science and Technology
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• 제51권3호
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• pp.197-206
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• 2023

A truss is a structure in which the members are connected and arranged such that they are primarily subjected to axial loading. A truss has the advantage that it can be used for a longer span because the structure distributes the applied force to its members well, and the load is transmitted only in the axial direction of the members. Trusses manufactured using timber have more advantages than those made of other materials. In this study, the properties of parallel chord trusses composed of timber chord and steel-web members were evaluated. We constructed truss specimens with various lengths by using upper and lower chords of 2 × 4 inch spruce-pine-fir lumber and steel-web members manufactured by S and P companies. The specimens were tested in accordance with KS F 2150. The test results showed that the load at the deflection limit and the deflection limit itself increased from L/180 to L/360 regardless of the length of the specimens. For specimens of the same length, the load at the deflection limit increased as the height of the parallel timber chord truss specimens increased from 200 to 300 mm. Successive installations of the steel-web members (SST) showed almost 2 times the load at each deflection limit compared to that of SAT specimens (alternate installation of the steel-web members). When comparing the three load-deflection limits in terms of the manufacturer of the steel-web members, the load at each deflection limit for SST specimens was higher than that for PST specimens.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2001년도 The Pacific Aisan Confrence On Intelligent Systems 2001
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• pp.310-315
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• 2001

We are focusing on an approach which handle a general Web as a resource in order to support self-directed learning for a student. Then, we are developing a Web based learning environment "Web-Retracer"for utilizing Web as teaching materials by a user′s Annotation. Although the learner can share the Web resource that the others utilized in this environment, Web resources unsuitable for a student′s needs becomes hindrance about her/his self-directed learning. In this paper, we propose a recommending method of the resource united with a student′s needs on the basis of a student′s learning and Web browsing history. This method analyzed the feature peculiar to a resource, and extracts the resource with which the needs of the feature and a student agreed.

• 한국초등과학교육학회지:초등과학교육
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• 제28권3호
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• pp.313-320
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• 2009

It takes elementary school teachers long time to search for instructional materials. They have also difficulties with choosing proper contents among much of the overlapping materials. Thus this study set out to investigate the current utilization of web materials by teachers, analyze the materials in the existing homepage, and identify useful materials for teachers. For those purposes, the investigator developed an evaluation framework to analyze science education materials in the existing homepage and analyzed materials using the framework. The materials had developed in the past failed to reflect the demands of teachers, who were the users, actively. Therefore, we took a survey to analyze their demands and reflected the results to establish a set of criteria to analyze materials. After dividing materials according to utilization and format, the external and internal elements of materials were assessed according to the evaluation items. If they systematically select many teaching and learning materials developed for elementary science and make efforts to vitalize their educational usage by sorting out overlapping materials and developing new needed ones, they will be able to save a huge amount of expenses and maximize the efficiency as educational materials.

• 한국컴퓨터산업학회논문지
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• 제2권3호
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• pp.275-284
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• 2001

교육용 인터넷 학습 자료에 대한 관심이 높아짐에 따라 생산되는 문서의 양도 급속히 늘고 있다. 그러나, 교육에 있어서는 양적 팽창보다 중요한 측면이 질적인 우수성이다. 양질의 웹 문서를 개발하고 보급하는 것이 교수-학습의 수준을 높이는데 중요한 요소이다. 이 논문은 웹 코스웨어의 수준 향상을 위한 평가의 준거를 마련하고 질적 개선을 위하여 기술 실태를 분석하며 교육적 효과를 거두기 위한 기술적 요구 사항들을 제시한다. 기술 실태의 현황 파악을 위하여 국내 최대의 교육 전문 사이트인 에듀넷의 초등 학습 자료에 대한 방문 조사를 실시하여 그 결과와 아울러 문제점을 분석하고 개선 방안을 제안한다.

• 산업경영시스템학회지
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• 제30권2호
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• pp.29-36
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• 2007

This study was concerned about mobile web-service of a VMI in the SCM system. The VMI would be a main module part of the SCM and regarded as very important thing on supply chain. Therefore, it was essential to react in real time of materials production and situation of used auto-part in procurement company. We could find an affordable method to realize the VMI in a web service. The web service has made inter relevant enterprise easy to collaborate because of supporting most operating system and frame-work. Moreover, the use of a mobile tools was guaranteed a product recording and requirement of materials to real time in a rapid changing of production environments. The result of this research was very useful to apply the VMI system in medium and small sized auto parts company. This web service package has programmed the Visual Studio Dot Net 2003 and the MS SQL 2000 as database.

• 펄프종이기술
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• 제48권2호
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• pp.99-105
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• 2016

The increase of wet web solid content after wet press and dry compressive strength were observed in lab study by judicious application of wood flour and starch for the old corrugated container (OCC). Pearl starch was better than cationic starch in strength development, but cationic starch was better for drainage. Application of vacuum on the mixed solution of wood flour and starch helped strength development further without loss of other properties. The effect of wood flour addition on wet web solid content improved as the wet pressing pressure increased. The use of wood flour and starch mixture improved wet web solid contents further.