• Journal of the KSME
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• v.27 no.2
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• pp.109-112
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• 1987

산업이 고도화 되면서 기계장비의 중량화와 고속화가 가속되어지고 있으며, 이로 인하여 과다한 진동과 소음을 유발시키고 있다. 특히 교통량이 많은 도로변의 건물 및 주택가에 소음공해가 심하며, 고속도로 및 철도연변의 건물 및 주택가는 비록 차음벽을 설치하여 많은 소음을 차단해 주지만 미흡한 상태다. 또한 철도 진동이 주위 건물 기초로 전파하여 건물의 진동을 유발하여 건물벽체가 갈라짐의 원인이 될 수 있다. 따라서, 교통 소음이 심한 장소에서는 차음율이 높은 재료를 사용하여 공기음을 차단하며, 건물의 유리창은 가능한 한 2겹유리(pair glass)를 사용한다. 또한 철도 연변의 건물기초는 베어링 페드를 사용하여 지반으로 전파되는 진동을 차단하여 줌으로써 안락한 주거환경 및 근무환경을 조성하리라 생각한다.

• Journal of KSNVE
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• v.3 no.3
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• pp.209-219
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• 1993

본 글에서는 아파트단지의 교통소음도 예측프로그램인 "TRANOIS-93"을 통하여 교통량, 도로, 방음벽, 수림대 등 각종 영향요인을 검토하여 1차적으로 소음저감대책 수립을 위한 시뮬레이션을 수행하고, 이를 분석하여 외부창호에 의해서 소음을 차단하지 않으면 안되는 경우에 대해서도 효과적인 대책을 수립할 수 있도록 창호의 차음설계자료를 제시하고자 한다. 이를 위해 창호의 기밀성, 유리의 두께, 이중창 사이의 공간층에 설치된 흡음재, 이중창에서 바깥창과 안쪽창과의 간격, 유리창의 크기 등의 요인에 대해서 실험을 통하여 차음개선량을 파악하고 이를 분석함으로서 창호제작 및 설계업무에 활용될 참고자료를 소개하고자 한다. 소개하고자 한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.05a
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• pp.244-245
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• 2019

Recently, a variety of window cleaning devices have been developed. There are, however, few cases of anticipated problems and countermeasures that may arise after these devices are installed. Therefore, in this study, the emergency condition was derived and the emergency scenario was derived for the rail-mounted cleaning device. Emergency scenarios and countermeasures derived from this study will be used for continuous improvement and supplementation of cleaning devices through prototyping and testing.

• Fire Science and Engineering
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• v.28 no.2
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• pp.26-33
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• 2014

Recently in Korea, the interest for using window and window-wall in building picks up due to the beauty and utilization of space. But, interior space of the buildings shall be compartmentalized by fire resistance structures in accordance with the Korean building codes to prevent the spread of flame and damage of human life in fire. In case of installing non-insulated glazed window in compartment wall, the flame spread to adjacent space and the damage of human life by radiant heat can occur in fire. On this study, to confirm the risk of radiant heat for non-insulated glazed window in fire, the fire resistance tests were conducted. The temperature rise and heat flux on unexposed space was measured and analyzed.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2256-2262
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• 2011

In this study, sound transmission loss (STL) is investigated on the multi-layered windows used in the KTX-sancheon and next generation HEMU-400x high speed train. Using TLOSS, which is developed as a special purpose STL analysis program, STLs of the multi-layered glass windows are analytically investigated and compared with the mass law result. Window specimens for the two train models are manufactured and intensity transmission losses are measured based on ASTM E2249-02. The problems in aspect of sound insulation are diagnosed on the two window models. The aim of this study is to provide useful data for the improvement of the interior noise in the high speed train.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1998.05a
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• pp.145-152
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• 1998

실내에서 가스폭발시 피해를 예측하기 위해서 폭발 화염면의 전파를 수치해석을 통해 해석했다. 확산방정식에 의해 가스누출에 의한 실내의 가스확산분포를 구했으며 문헌에서 선택한 누출의 초기조건을 사용했다. 화염온도를 계산하기 위해 각 가스 혼합비에 따른 엔탈피와 화학식에 대한 reduced mechanism을 사용했으며 문헌에서 찾은 각 가스의 농도별 층류 연소속도를 혼합가스의 층류연소속도에 적용시켰다. k-$\varepsilon$ 모델에서 turbulance energy를 층류연소속도와 결합시켜 난류화염 전파속도를 모델링 했다. 화염면의 전파를 분석하기 위해 실내의 위치에는 직각, 화염면의 전파에는 원통좌표계를 사용했다. 유리창의 파손에 의한 화염전파면의 변화에 따른 압력상승 요인을 해석하였으며 창문의 크기에 따라서 점화위치에 따른 실내 압력상승의 영향이 서로 다르게 나타나는 결과를 얻었다.

• The Journal of Korea Robotics Society
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• v.5 no.1
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• pp.14-22
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• 2010

Recently researches on the window cleaning robot are being conducted actively. Moving mechanismsof these window cleaning robots are divided into two categories, which are towed type and walking type. Towed type is focused on fast cleaning on the flat surface of building and walking type has priority on cleaning task on relatively complex surface with overcoming obstacles. Currently commercialized towed type window cleaning robot has weakness that it is hard to adhere closely with the wall and easy to be affected by wind. In case of walking type it has the problem that the position errors are continuously accumulated during motion. In this paper, we propose new towed and walking type mechanism which can compensate previous weaknesses. After that we estimate the performance of each proposed mechanism by simulation.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.559-564
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• 2011

The UV blocking type pressure-sensitive adhesive sheet was developed by mixing UV blocking reagent with adhesive material, instead of conventional method in which the reagent was mixed with PVC substrate. The blocking performance of the sheet was evaluated by measuring the absorbance in 280-400 nm region. Both organic and inorganic type blocking reagents were examined. The blocking ability of the former is better than that of the later. Only 1% addition of blocking reagents is effective to block UV light without affecting to visibility and tackiness of adhesive tapes.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.05a
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• pp.272-273
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• 2017

As businesses put a greater emphasis on outward appearances, the demand for external window cleaning has been on the rise. However, with the conventional labor-intensive window cleaning method, it is hard to meet this demand. Therefore, this study proposes a Life Cycle Cost (LCC) analysis model for a guiderail-type cleaning robot, and estimate the LCCs of the conventional method and the cleaning robot. The findings of this research are expected to serve as a guide for future development of a cleaning robot.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.10a
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• pp.457-462
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• 2011

The sidewall of the HEMU-400x consists of two parts. One is the multi-layered structure including aluminium extruded panel and the other is the double glazed window. When the train runs in a tunnel, the equivalent sound insulation performance of the side wall significantly influences the internal noise levels. In aspect of the sound insulation strategy, it is important to make two parts have similar performance. In this study, the intensity sound transmission loss (ITL) is measured on the specimens of the two parts. Mass law deviation (MLD) is considered in order to compare the sound insulation performance of the two parts in respect of the weight. Contribution of each part to the sound insulation is analyzed and the sound insulation strategy is investigated to reduce the interior noise.