• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.1209-1211
• /
• 2017

창문을 열고 닫음에 있어서 사람의 신체에 따라, 창문의 위치에 따라 어려움이 발생한다. 또한 최근 대기 오염도가 심해지고 지구 온난화로 인한 한반도 기후 변화로 국지성 집중호우의 빈도가 증가하고 있다. 이로 인해 사용자가 부재중일 때 창이 열려있다면 집 안으로 먼지가 들어올 것이고, 국지성 호우에 의해 비가 들어오는 경우가 생길 수 있다. 본 논문에서는 이 문제점들에 주목하여, 어플과 연계를 통한 원격 창문 개폐 장치를 고안하였다. 본 장치를 이용한다면 신체적인 한계가 있는 어린이, 노약자, 장애인과 같은 이들이 쉽게 창문을 개폐할 수 있을 것이다. 그리고 환기가 필요한 공장, 격납고 등의 높은 위치에 있는 창문을 쉽게 개폐할 수 있어 분진 폭발로 인한 안전사고 역시 예방하는 효과가 있을 것이다. 또한 사용자가 외출할 때 창문을 닫고 나오지 못한 경우 어플을 이용하여 원격으로 닫을 수 있으며, 이를 통해 밖에 황사, 미세먼지가 들어오는 것과 비가 들어오는 것을 차단할 수 있다. 마지막으로 열린 창을 닫는다는 것에서 방범의 효과 역시 가져올 수 있다.

• Journal of Energy Engineering
• /
• v.25 no.4
• /
• pp.207-213
• /
• 2016

In this study, a thermal flow analysis was performed using the commercial code, ANSYS-FLUENT to reduce room temperature in a turbine building of power plant. The selected control volume of the operating floor and deaerator floor for the turbine building was respectively modelled. The skylight windows at the deaerator floor were employed for ventilation windows. Through the study, in the first we found that all window close of the deaerator floor is one alternative for reducing the temperature of the operating floor. The next thing we knew that for windows open at the front of the deaerator floor, the temperature of deaerator zone and crane zone can be respectively reduced to $1.5^{\circ}C$ and $1.6^{\circ}C$. In addition, for windows close at the rear of the deaerator floor, the temperature of deaerator zone and crane zone can be respectively reduced to 1.4 and $0.5^{\circ}C$. Therefore, it was concluded that a better choice is to open the front windows at deaerator floor to reduce the temperature of the entire deaerator floor having high temperature.

• The Journal of Engineering Geology
• /
• v.25 no.1
• /
• pp.103-113
• /
• 2015

This study presents a novel algorithm for determining the P-wave arrival time using amoving window function to improve source localization in low-SNR (signal-to-noise ratio)acoustic emissions. The proposed algorithm was applied to low-SNR signals to verify the accuracy of measurements against existing algorithms. When other algorithms were applied, the test results revealed that SNR decreased and accuracy was reduced, especially where SNR wasless than 2.14. The proposed algorithm using amoving window function considers the frequency characteristic and signal amplitude simultaneously, and produced reliable results where SNR was 2.14.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2019.10a
• /
• pp.904-906
• /
• 2019

해외에서는 드론을 이용한 배달 서비스가 상용화되는 추세이지만, 한국에서는 여러 가지 한계점에 의해 서비스 개발이 침체하여 있는 상황이다. 이 문제를 해결하기 위해 창문에 카메라를 장착하여 드론이 촬영되고 있는 영상을 리눅스 서버에 전송하고, 딥러닝과 이미지 프로세싱을 통해 드론을 검출하고 택배를 받을 수 있는 위치로 조정한다. 조정이 완료되면 창문 개방 후 택배를 받는다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.17 no.6
• /
• pp.147-153
• /
• 2003

In this paper, implementation of active noise barriers(ANB) to attenuate exterior noise which is propagated through open windows is presented. The leaky multiple channel LMS algorithms are used for adaptive filters tc improve the convergence property, and a new type of the active noise barrier is proposed. The attenuation effects of conventional active noise control(ANC) systems using leaky multiple channel LMS algorithms and the proposed system are compared by experiments using a TMS320C33 digital signal processor. Noise attenuation levels at the points of error microphones are similar for both systems, but average noise attenuation effects of the proposed system for an entire space of an experimental enclosure are much better than conventional ANC systems.

• Journal of the Korean Institute of Gas
• /
• v.27 no.4
• /
• pp.12-18
• /
• 2023

The effective evacuation strategy according to the accident scenario is crucial to minimize human casualties in the event of toxic gas leak accidents. In this study, the effect of the direction of a building and the location of an industrial complex on the increase in indoor concentration and outdoor diffusion was examined under the same leakage conditions, and effective evacuation criteria were established. In addition, the guidelines for building directions were suggested when constructing buildings that would mitigate human damage caused by chemical accidents. Three scenarios where buildings faced the front, side, and rear of the leakage direction were investigated through CFD simulations. The results revealed that when the building faced the industrial complex, both indoor and outdoor average gas concentrations increased significantly, reaching up to 120 times higher than the other two orientations. Moreover, the indoor space was filled with toxic gas substances more than twice in the same time due to the rapid increase of indoor concentration rate. In cases where the building's windows were positioned at the front, toxic gas stagnation occurred around the building due to pressure differences and reduced flow velocities. Based on our findings, the implementation of these guidelines will contribute to safeguarding residents by minimizing exposure to toxic gas during chemical accidents.

• The KIPS Transactions:PartB
• /
• v.10B no.7
• /
• pp.837-846
• /
• 2003

This paper deals with plain figures on the architectural drawings of apartment. This kind of architectural drawings consist of main walls represented by two parallel bold lines, symbols (door, window, $\cdots$), dimension line, extension line, and dimensions represent various numerical values and characters. This paper suggests a method for recognizing main wall which is a backbone of apartment in an architectural drawing. In this thesis, the following modules are realized : an efficient image barbarization, a removal of thin lines, a vectorization of detected lines, a region bounding for main walls, a calculation of extension lines, a finding main walls based on extension line, and a field expansion by searching other main walls which are linked with the detected main walls. Although the windows between main walls are not represented as main walls, a detection module for the windows is considered during the recognition period. So the windows are found as a part of main wall. An experimental result on 9 different architectural drawings shows 96.5% recognition of main walls and windows, which is about 5.8% higher than that of Karl Tombre.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2002.11a
• /
• pp.344-345
• /
• 2002

철도차량은 고속으로 운행되므로 승객의 안전을 위해 객실 창문의 개폐가 불가능하게 되어 있다. 객실은 전체가 밀폐되어 자연환기가 아닌 공조시스템만으로 공기 질이 조절 가능하다. 철도는 주로 장거리 승객이 이용하며, 다수의 승객은 한정된 공간에서 장시간 체류하면서 객실 내에서 발생되거나 외부에서 유입되는 각종 대기오염물질에 노출되고 있다. (중략)

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.12 no.1
• /
• pp.75-82
• /
• 2000

This paper presents the predicted results by CFD technique of air flow and contaminant distribution in a full-scale kitchen opened to a living room, ventilated by a exhaust hood. To analyze the characteristics of the indoor environment, the concept of contaminant index was defined. In this study, the locations of the gas range and the window were chosen as the parameters to investigate the indoor environment. The values of the contaminant index for several layout of the gas range and the window were calculated and compared. When the gas range is installed along the wall with specified window location, its position in relation to the wall has unnoticed effect on contaminant infer. Once the location of the gas range is fixed, the indoor air quality may deteriorate by the proximity of the window to the gas range. This is due to the shorter distance that external fresh air must travel within the kitchen before it reaches the exhaust fan.

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