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라이즈-스팬 비에 따른 개폐식 돔 지붕의 외장재 설계용 피크순압력계수
천동진,김용철,Cheon, Dong-Jin,Kim, Yong-Chul 한국공간구조학회 2024 한국공간구조학회지 Vol.24 No.2
In this study, the characteristics of wind pressure distribution on circular retractable dome roofs with a low rise-to-span ratio were analyzed under various approaching flow conditions by obtaining and analyzing wind pressures under three different turbulent boundary layers. Compared to the results of previous studies with a rise-to-span ratio of 0.1, it was confirmed that a lower rise-to-span ratio increases the reattachment length of the separated approaching flow, thereby increasing the influence of negative pressure. Additionally, it was found that wind pressures varied significantly according to the characteristics of the turbulence intensity. Based on these experimental results, a model for peak net pressure coefficients for cladding design was proposed, considering variations in turbulence intensity and height.
풍동실험을 통한 개폐 유형별 개폐식 돔 지붕의 풍압 특성 분석
천동진,이종호,김용철,윤성원,Cheon, Dong-jin,Lee, Jong-Ho,Kim, Yong-Chul,Yoon, Sung-Won 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.1
In this study the characteristics of wind pressure that are depending on the open type of retractable dome roof were analyzed according to the wind pressure coefficient and wind pressure spectrum. The analysis results showed that the open type and shape of the roof both had a significant impact on the wind pressure changing. In case of the edge to center open type, the wind pressure has not changed much because of the complex turbulence of flow and open area. On the other hand, in case of the center to edge open type, it has confirmed that wind pressure increases due to the separation of flow in windward and open area.
국가별 풍하중 기준과 풍동실험에 따른 대공간 구조물 지붕의 풍압계수 분석
천동진,윤성원,Cheon, Dong-jin,Yoon, Sung-Won 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.4
Spatial Structure has suffered from a lot of damage due to the use of lightweight roofs. Among them, the damage caused by strong winds was the greatest, and the failure of the calculation of the wind load was the most frequent cause. It provides that wind tunnel test is used to calculate the wind load. However, it is often the case that the wind load is calculated based on the standard of wind load in the development design stage. Therefore based on this, the structure type and structural system and member design are often determined. Spatial structure is usually open at a certain area. The retractable roof structure should be operated with the open roof in some cases, so the wind load for the open shape should be considered, but it is not clear on the basis of the wind load standard. In this paper, the design wind pressure of a closed and retractable roof structure is calculated by KBC2016, AIJ2004, ASCE7-10, EN2005, and the applicability of wind pressure coefficient is compared with wind tunnel test.
유해가스(CO,CO₂) 감지정보 전송을 위한 USN 지그비센서노드 구현
천동진(Dong-Jin Cheon),박영직(Young-Jik Park),이승호(Seung-Ho Lee),김정섭(Jeong-Seop Kim),곽동걸(Dong-Kurl Kwak),정도영(Do-Young Jung) 대한전기학회 2010 전기학회논문지 Vol.59 No.7
In this study, Zigbee Sensor Node to transmit harmful gases CO and CO₂ information using wireless communication within the ground and underground structures were developed. Wireless communication protocol was used Zigbee Stack included IEEE 802. 15.4 MAC protocol. For wireless transmission of detected harmful gas signal from ADC of MCU was implemented Zigbee Sensor Node that was developed protocol using Serial-Port-Profile(SPP) here. The proposed Zigbee Sensor Node was verified transmission distance from experiments. Transmission distance was into 90m in experiments. Distance experiments were measured at 10m intervals using sine & pulse wave input signal at indoors. The proposed Route Sensor Node was applied mesh routing protocol. When built up USN(Ubiquitous Sensor Network)using Route Sensor Node, transmission distance was not limited. On the experimental results, harmful gas values between direct measurements and USN measurements were consistent. The semiconductor CO sensor and N-DIR CO₂ sensor module as a harmful sensor was used. Therefore, the proposed Zigbee Sensor Node was verified about reliability and validity to build USN for transmission of harmful gas information.
다양한 경계층 유동을 고려한 개방형 대공간 지붕 구조물의 외장재 설계용 피크순압력계수 제안
천동진(Cheon, Dong-Jin),김용철(Kim, Yong-Chul),윤성원(Yoon, Sung-Won) 대한건축학회 2024 대한건축학회논문집 Vol.40 No.2
The wind pressure characteristics of open large-span roofs under various boundary layer flow variations were investigated based on wind tunnel tests, and a peak pressure coefficient model was derived for cladding design. First, the characteristics of wind pressure under smooth flow and various turbulent boundary layer flows were analyzed in detail. It was found that the wind loads acting on the roof increased with the increase in turbulence intensity under various flow conditions. Then the changes in peak pressure coefficients were carefully checked with variations in turbulence intensity, and comparisons were made with the proposed values from previous study. Finally, based on turbulence intensity, a model for peak pressure coefficients was proposed, it can be applied to the cladding design of open large-span roofs
u-IT기반 계측정보를 이용한 급경사지붕괴 예측 시스템 개발
천동진(Cheon, Dong-Jin),박영직(Park, Young-Jik),이승호(Lee, Sung-Hou),김정섭(Kim, Jeong-Seop),정도영(Jung, Do-Young) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.10
본 논문은 급경사지(산사태 및 사면붕괴, 축대 등)붕괴 등으로 인하여 많은 생명과 재산피해 방지를 목적으 로 붕괴 위험성을 감지하고 신속히 대응을 할 수 있도록 하기 위하여 u-IT기반의 급경사지 붕괴예측 감시용 실시간 모니터링 시스템을 개발하였다. 급경사지붕괴 감시에 중요한 계측기로서 강우량 계측기, 간극수압 계측기, 지표변위 계측기, 지중경사 계측기, 함수비계측기, 영상분석 계측기 등을 선정하고 테스트베드에 적용하였다. 각 계측기의 신뢰 성 검증에 필요한 동작기능 및 성능확인은 현장에 설치된 계측기 별로 실험을 통하여 확인하였다. 본 연구에서 개발 한 급경사지붕괴 감지를 위한 USN기반의 실시간 급경사지 모니터링 시스템을 급경사지 붕괴감지뿐만 아니라 도로변 절개사면과 암반사면 등에 상시계측을 통하여 붕괴위험 예측에도 적용할 수 있으므로 인명피해와 재산피해를 최소할 수 있을 것으로 판단되며, 이 시스템은 본 연구의 시범적용 결과를 바탕으로 급경사지 전역에 확산될 계획에 있다. This paper has studied about the development and application of landslide collapse prediction real-time monitoring system based on USN to detect and measure the collapse of landslide. The rainfall measuring sensor, gap water pressure sensor, indicator displacement measuring sensor, index inclination sensor, water content sensor and image analysis sensor are selected and these are applied on the test bed. Each sensor's operation and performance for reliability verification is tested by the instrument which is installed in the field. As the result, u-IT based real-time landslide monitoring system which is developed by this research for landslide collapse detection could minimize life and property damages because it makes advance evacuation with collapse risk pre-estimate through real-time monitoring on roadside cut and bedrock slopes. This system is based on the results of this study demonstrate the effect escarpment plan are spread throughout.
유비쿼터스 센서네트워크(USN)를 이용한 안전감시.통제 네트워크 기반구축에 관한연구
천동진(Cheon, Dong-Jin),박영직(Park, Young-Jik),김정섭(Kim, Jeong-Sub),이승호(Lee, Seung-Ho),곽동걸(Kwark, Dong-Kurl),정도영(Jung, Do-Young) 한국화재소방학회 2008 한국화재소방학회 학술대회 논문집 Vol.2008 No.추계
지구온난화로 재난 재해가 날로 증가 되고 있으며, 그 규모도 대형화 되고 있는 추세이다. 재난 재해의 원인으로서는 자연적인 것도 있지만 인위적인 것이 큰 부분을 차지하고 있다. 이러한 재난 재해를 사전에 예방 및 통제를 목적으로 환경정보를 수집하여 위험상태를 판단하기위해 다양한 환경정보수집 무선통신기술에 대한 연구가 활발하게 진행되고 있다. 본 연구는 이러한 목적을 달성하기 위해 다양한 환경정보수집 및 시간 장소 설치 등에 많은 편리성 및 효율성을 갖으며, Ubiquitous Sensor Network(USN)기반요소가 되는 Sensor Network Node를 연구 개발하였고, 이를 이용하여 USN 환경감시 및 통제 네트워크를 구축하여 실험을 통하여 타당성을 입증하였다.