• Proceedings of the Korean Information Science Society Conference
• /
• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (B)
• /
• pp.463-465
• /
• 2004

최근 무선 인터넷 사용자가 급증하고 있다. 이에 따라 무선 상거래, 무선 광고와 같은 응용의 신속한 지원을 위해 WAP 푸쉬 서비스를 제공하는 모바일 응용의 생산성 향상이 요구되고 있다. 본 논문에서 소개하는 MAG은 데이터베이스부터 구축해야 하는 WAP 응용과 기존 데이터베이스를 사용하는 WAP 응용의 신속한 작성을 위해 필요한 EJB 컴포넌트들과 질의 처리 및 푸쉬 서비스를 위한 관리자음 JSP 웹 컴포넌트를 생성하고 처리된 결과를 보여주는 HTML 폼을 생성한다. 또한, MAG온 질의 처리를 위한 고객용 JSP 웹 컴포넌트와 무선 응용의 사용자 인터페이스로 사용되는 WML 데크들과 함께 이 데크를 구성하는 카드들을 자동 생성한다. MAG온 EJB와 JSP 등의 컴포넌트 기술을 도입함으로써 3-계층 구조를 갖는 WAP 응용의 확장성, 재사용성, 이식성 등도 지원한다 WAP 푸쉬는 고객이 원하는 시점과 장소에서 정보를 제공받을 수 있다는 점에서 서비스를 향상시킬 수 있다. 또한 비슷한 기능을 지원하는 타 상응 도구들과 달리 MAG이 생성하는 응용은 질의의 대상인 개체와 연관된 모든 개체들의 집합을 한 단위로 검색 할 수 있어 연관된 정보들을 신속하게 제공할 수 있다.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 한국건축시공학회 2019년도 추계 학술논문 발표대회
• /
• pp.12-13
• /
• 2019

Flexible Table Form is being used more frequently at the level of formwork in construction site. However, one of the most common structural frameworks, the RC column-beam structure, is having problems in these factors. To improve this problems, this study developed support devices and proposed installation specifications to enable application of the one-way void slab method to flexible table form. It is expected that the effects of reducing the self-weight of the slab in the floor slab construction using flexible table form.

• The Transactions of the Korea Information Processing Society
• /
• 제5권11호
• /
• pp.2862-2873
• /
• 1998

In the integrated development environments for automatic generation of Java applets and applications tat can be used as Internet and Intranet-based client-server programs, it is essential to interconnect between the function components such as main window, project manager, object inspector, source code editor, and form designer. This paper describes the function components related with the generation of mobile code based client-server program. In then designs and implements a data structure, named 'JCode', for interconnection between the function components. Finally, it discusses the action principles of Two-Way Access technique based on JCode. By applying the proposed JCode based interconnection technique, user can program efficiently using the function components.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 한국전산구조공학회 2009년도 정기 학술대회
• /
• pp.315-318
• /
• 2009

본 논문에서는 해상 기초 교각 매스 콘크리트의 수화열 저감 방안을 다루었다. 저발열 콘크리트, Mesh형 거푸집 공법 등에 대한 실험을 수행하여 각각의 수화열 저감효과를 평가하였다. 현장 실험은 사용 시멘트와 거푸집의 종류, 거푸집의 사용 면수에 따라 총 4 type으로 구성하였으며, 이에 대한 실험 결과와 유한 요소 해석 결과를 비교, 검증하여 최종적인 수화열 저감 성능을 도출하고자 하였다. 실험을 통해, 저발열 시멘트와 유로폼을 사용하는 것이 수화열 저감을 위해 효과적인 방법으로 판명되었으나 추가 공사비의 발생으로 효율성이 떨어질 것으로 판단된다. 또한 Mesh형 거푸집 적용 면 수와 온도 상승 저감 효과는 비례하는 것을 알 수 있었지만 내 외부 온도차가 다소 크게 나타나 수화열에 의한 균열 발생 확률면에서는 다소 불리하게 나타났다. 그러나 실험 단계에서 생략된 양생과 관리를 통하여 균열의 저감효과를 거둘 수 있을 것으로 판단되며, 추가적으로 거푸집 해체 단계를 생략함으로 공기단축 측면에서 유리할 것으로 판단된다.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• 제45권7호
• /
• pp.581-593
• /
• 2017

In order to develop high efficiency propeller for multicopter type UAV, we designed, analyzed and tested aerodynamic and structural dynamics. For the design of the high efficiency propeller, the optimum design method was applied for the determination of the airfoil and the three-dimensional planform is designed to reduce induced power of the propeller. The flight suitability of the derived shape was determined through structural design and analysis. The rotation test was performed to confirm the performance of the analytically designed shape. In this paper, we propose a procedural propeller design methodology using these design analysis test methods.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 한국전산구조공학회 2006년도 정기 학술대회 논문집
• /
• pp.906-913
• /
• 2006

The failure mechanism of a hollow bridge deck which is made of glass fiber reinforced polymer(GFRP) is investigated using both experiments and analysis. While the load-displacement behavior of the deck in the transverse direction shows a strong nonlinearity even in its initial response with relatively small magnitude of loads. In order to imporve the structural behavior of the deck in the transverse direction, we suggested that the empty space of the bridge deck is filled with a foam and investigated experimentally the static behavior of the orthotropic bridge deck which is made from GFRP and polyurethane foam. It is found that although the elastic modulus of the foam compared to that of the GFRP is about the order of $10^{-3}$, the structural behaviors in the weak axis such as nominal strength, stiffness, etc. are greatly improved. Owing to the low mass density of the foam used in this study, the bridge deck is still light enough with the improved structural properties.

• Journal of the Korean Society for Precision Engineering
• /
• 제29권7호
• /
• pp.785-792
• /
• 2012

Foam structure is usually hard to model due to the complexity of the geometry of cells. So, many simplified models to represent complicated foam structures have been proposed, but most of them are not actually describe the random feature of the cell structure well. So, in this study, two dimensional isotropic and anisotropic closed cell structures of the foam were modeled using the concept of Voronoi cells. The elasto-plastic deformation behavior under compressive loads was investigated by finitie element analysis, and the results were compared with ideal honeycomb structure. In addition, the effect of anisotropy of Voronoi cell structures of the foam on Young's modulus and yield stress under compressive loads was studied.

• Journal of the Korea Society of Computer and Information
• /
• 제25권12호
• /
• pp.219-226
• /
• 2020

This study conducted an online survey of university students based in Jeolla-do province from September 1 to 10, 2020 using Naver survey form to find out the perception and attitude of paramedic students about child abuse. A total of 293 students were studied, and the collected data was analyzed using SPSS WIN 20.0. The analysis of general characteristics, recognition of child abuse reporting obligations and activation plans, and awareness of child abuse education were calculated with frequency and percentage, and the degree of child abuse awareness was calculated by the average and standard deviation. Differences in perception of child abuse behavior based on the general characteristics of respondents were used T-test and ANOVA.

• Journal of the Society of Naval Architects of Korea
• /
• 제59권1호
• /
• pp.9-17
• /
• 2022

In this paper, wind load on a semi-submersible rig was investigated using Computational Fluid Dynamics (CFD). A maritime atmospheric boundary layer model for wind profile was implemented such that the wind profile shapes were retained throughout the computational domain. Wind load on the semi-submersible rig was calculated under the maritime atmospheric boundary layer and matched well with the results from wind tunnel test within a ±20% error. Overturning moments with variation of draft were investigated by decomposing into drag and lift components. It was observed that the contribution from lift to the overturning moments increased as the draft got higher. The majority of the lift components originated from deckbox which served as a lifting body due to the accelerated streamlines between waterline and the bottom of the deckbox.

• Journal of the Korea institute for structural maintenance and inspection
• /
• 제13권2호통권54호
• /
• pp.137-144
• /
• 2009

This paper provides the results from evaluating the stiffness of Hi-Form joint by an experiment and the system identification method using the dynamic modal data, and the reasonable modeling method of Hi-Form joint which is proposed for improved stair construction recently. Based on the crack pattern and load-displacement relationship and the damage distribution, it can be judged that Hi-Form joint can't fully transfer the forces between the elements linked, and we propose that the joint is modeled as a element which have a stiffness with 50% decrease.