• Bulletin of the Korean Chemical Society
• /
• 제27권4호
• /
• pp.515-518
• /
• 2006

It is explicitly shown that a supersymmetry structure exists in the spectrum of a rigid symmetric top rotor in the molecule-fixed frame. Using projection operators constructed from the time-reversal symmetry of the rotor, the full rotor Hamiltonian is separated into two parts, i.e., the bosonic and fermionic components. The construction, without ambiguity, suggests that the rotor has a supersymmetry in it. This supersymmetry is mathematically equivalent to that of the free rotor on a plane recently noted by Rau.

• 한국건설관리학회논문집
• /
• 제13권3호
• /
• pp.78-88
• /
• 2012

국내의 건설실패 관련 연구는 체계화된 실패정보 분류체계 및 실패정보의 활용을 위한 방안을 제시하는 것에 초점을 맞추고 있다. 그러나, 건설현장의 한정된 관리자가 건설실패를 유발하는 다양한 원인에 대한 예방대책을 수립하는 것은 한계가 있다. 따라서, 효율적인 건설실패 예방활동이 이루지기 위해서는 많은 실패원인에 대한 정량적 평가를 통해 우선순위를 정하여 효율적인 예방대책이 수립되어야 한다. 이에 본 연구는 정량적인 평가를 통해 실패를 유발하는 핵심관리요인을 도출 할 수 있도록 FMEA(Failure Mode and Effect Analysis) 기법을 활용한 건설실패 핵심관리요인 선정방법을 제시하고, 공동주택 골조공사를 대상으로 핵심관리요인을 분석하는 것을 목적으로 하였다. 이를 위해 FMEA 기법의 위험도를 실패 위험성과 예방성으로 구분하여 평가할 수 있도록 하였다. 본 연구에서 제시한 핵심관리요인 평가방법은 건설실패의 사전예방대책을 효율적으로 수립하는데 활용될 수 있으며, 향후 유사한 연구를 통해 프로젝트 수행 단계별 혹은 다양한 시설 및 공종에 대한 핵심관리요인을 도출하는데 활용될 수 있을 것으로 기대된다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2015년도 추계 학술논문 발표대회
• /
• pp.43-44
• /
• 2015

In this study, spalling property were evaluated from concrete with compressive strengths of 30MPa, 90MPa, 180MPa, applied with fast heating condition(ISO-834 standard heating curve) and slow heatign condition(1℃/min). As a result, the spalling property of concrete was shown differently with compressive and heatign rate. And It could be separated three as non spalling, surface spalling and explosive spalling.

• 농촌계획
• /
• 제16권3호
• /
• pp.11-17
• /
• 2010

With international attention to the rural landscape, there have been landscape management and conservation efforts. Because it contains characteristics of rural area, rural landscape has been recognized as an important component of rurality. With rural amenity resources survey projects launched since 2005, rural landscape categorization and evaluation such as resource value, use value, beauty, originality, traditionality, maintenance are performed by expert questionnaire survey and 100 rural amenity resources are selected. In this study, we performed fractal analysis for developing evaluation system of the rural landscape photographs. In evaluating processes, main and surrounding landscape are separated and fractal indexes are calculated and analyzed with beauty value scoured by experts. Results show that beauty value is not significantly related with fractal index but differences of main and surrounding landscape fractal index.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2011년도 추계 학술논문 발표대회
• /
• pp.65-67
• /
• 2011

It is necessary to the development of the best maintenance system for applying the long-term maintenance plan using the cost breakdown structure in the educational facilities. This study developed the cost breakdown structure for the best maintenance system using the delphi method. For the convenience of maintenance, the maintenance cost breakdown structures are separated into building exterior wall, building inside wall, electric installation, heating installation and outdoor facilities. And these results atomized in each parts. And this study constructed the cost breakdown structure to maintenance's practicality and effectiveness through the expert analysis.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2001년도 가을 학술발표회 논문집
• /
• pp.277-284
• /
• 2001

Recently, with development of mechanics of materials, as pursuing the high speed of the ships, a demanding of composite construction which satisfies high strength and low weight at the same time is iner casing. A sandwich element is a type of composite construction, which is composed of thin, strong, stiff and relatively high density faces and a think, light, and weaker core material. As 2nd moment is increased by faces is separated from the neutral axis farther, a sandwich element is most effective light structural form. In this paper, the make a comparative study Aluminum Honeycomb Sandwich Panel(AHSP) and Aluminum Pyramid Sandwich Panel(APSP).

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2018년도 추계 학술논문 발표대회
• /
• pp.173-174
• /
• 2018

In this study, the objective of this study was to evaluate the adhesive characteristics of existing self-adhesive rubber asphalt sheet, butyl sheet and acrylate sheet in a low temperature environment through Tack Rolling Ball Test to obtain basic data on acrylate. As a result of this experiment, in the case of the self-molding rubber asphalt sheet and the butyl rubber sheet, the compound of the sheet was frozen in the low temperature environment and the iron bead was separated. On the other hand, the acrylate sheet did not freeze the acrylate even at 0 ℃, It is confirmed that the measured value is shown by Ball Test.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2013년도 춘계 학술논문 발표대회
• /
• pp.19-20
• /
• 2013

Green Frame is a column-beam system constructed by composite precast column and beam connected by embedded steel of their. From when the precast concrete beam of Green Frame is installed, until the concrete of slab and connection joint is cured, the self load of beam shall be supported by the embedded steel of it. Therefore, the concrete of beam could be separated from the embedded steel if the shear connector of beam of Green Frame is designed by the code on Structural standard. So, this study suggest an equation for the shear connection of composite precast concrete beams of Green Frame. The result of this study will be used as the main equation of the calculation model for shear connectors of composite precast concrete beams.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2019년도 추계 학술논문 발표대회
• /
• pp.241-242
• /
• 2019

This technology is a water leak repair technology using composite materials of concrete structures that block leakage of structures by injecting rapid microcement into the face of underground concrete to block water and injecting flexible glycidylacrylate. Rapid micro cement system repair materials are mixed with fine fibers to improve the flexural sensitivity of the material and to form a layer that blocks stabilized water at the back of the structure by allowing rapid and tight spatial filling during injection with high cohesion The glycidylacrylate repair material can control the expansion rate, and the external stress also has the characteristic that the form of the material is not destroyed or separated, which can also be applied to vibrating induced structures that produce repetitive fatigue loads, and has an effective durability in saline, alkali, acid (chloric acid, sulfuric acid, nitric acid).

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2020년도 가을 학술논문 발표대회
• /
• pp.75-76
• /
• 2020

In this study, in order to check whether the adhesion strength can be secured when installing concrete by mixing super-retarding agents, the splitting tensile strength of the joints of each mold was measured and then analyzed. The results of the experiment showed that the bonding performance of the joint is adversely affected if the installation delay is delayed for more than 24 hours, and that the attachment performance can be secured if the installation is delayed within about 24 hours.