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Zigbee 무선통신 네트워크 기반 변형측정 시스템 설계 및 개발
김상석(Sang-Seok Kim),박장식(Jang-Sik Park),고석조(Seok-Jo Go),노희종(Hee-Jong Ro) 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.8 No.3
본 논문에서는 구조물의 안전한 관리를 위하여 진동현방식 센서를 이용하여 변형을 측정하고 Zigbee 무선네트워크를 통하여 원격 모니터링할 수 있는 시스템을 구현하였다. 구현한 변형측정기는 진동현방식 센서를 구동하여 출력되는 신호의 주파수를 측정하여 변형을 계산하고, 변형 측정에 있어 요구되는 온도 보상을 위한 온도를 측정한다. 2축 가속도센서를 이용하여 변형의 방향을 측정할 수 있다. 개발한 변형측정기에는 보다 효율적인 모니터링을 위하여 유무선 통신 기능이 있다. 실험을 통하여 개발한 진동현방식 변형측정 시스템이 원격모니터링에 효과적임을 확인한다. In this paper, a system using vibrating wire sensor and zigbee wireless network has been implemented to monitor and manage the structure. The implemented strain controller drives vibrating wire sensor and computes strain from measuring frequency of the output signal. Temperature sensor is included to compensate strain by temperature. Using two axis acceleration sensor of strain controller can measure the direction of strain or deformation. To measure strain more effectively, wired and wireless communication function is included in this device. As results of experiments, it is shown that the developed system can be effectively applied to measure strain of the structure
김상석(Kim, Sang Seog),정문오(Jeong, Moon Oh),황재훈(Hwang, Jea Hoon) 한국지역개발학회 2017 韓國地域開發學會誌 Vol.29 No.4
This study has analyzed the present state and the effects of REITs on the share price and has presented ways to improve the system based on policy-based implications. The key conclusions of the analysis on the present state and the effects of REITs on the share price are as follows. First, the national interest in REITs is on the rise in the long term but has seen a slowdown in its growth in recent years. This indicates that people have still difficulties in getting access to indirect investment of real estate as REITs have grown in the form of unlisted private investment despite their external growth. Second, REITs focus their investment in office buildings, especially in downtown and Gangnam areas, featuring very strong clustering in terms of spatial characteristics. However, the development-oriented REITs focus on residential housings mostly in non-Seoul metropolitan area, which indicates strong potentials in provincial metropolitan cities as these REITs still keep their presence in Seoul metropolitan area. Therefore, although REITs are expected to continue a steady grow, there is a need to pay attention to their growth patterns. Third, the listed REITs are affected by macroeconomic factors, including government bonds, corporate bonds, KOSPI and land prices, and additionally by capital money as well. Although the size of capital has a positive effect on the share price of REITs but the actual size of capital of the listed REITs does not even reach the average of all commercially available REITs. This indicates that the regulations imposed on the listed REITs not only shrink the number of REITs but also make it hard to secure capital investment. All of these phenomena raise a need for improving on unreasonable regulations along with the consideration of support policies in order to ensure a sustainable growth of REITs.
항공기용 전기-정유압식 작동기(Dual Redundant Asymmetric Tandem EHA)의 열특성 예측을 위한 연구
김상석,박형준,김대연,김대현,김상범,이준원,최종윤,Kim, Sang Seok,Park, Hyung Jun,Kim, Daeyeon,Kim, Dae Hyun,Kim, Sang Beom,Lee, Junwon,Choi, Jong Yoon 항공우주시스템공학회 2022 항공우주시스템공학회지 Vol.16 No.3
The electro-hydrostatic actuator (EHA) recently has been used in flight control fields for aircraft because of its benefits of minimizing oil leakage and weight, improving safety, and etc. while independently operating the hydraulic power source and eliminating complex hydraulic piping. The aircraft of which EHA is installed inside, has the thermal management issue of EHA, because of its limited cooling source as compared with the aircraft which installs the traditional central hydraulic system. So, the thermal analysis model which predicts the thermal characteristics of EHA, is required to resolve this thermal management issue. In this study, an oil circulation circuit inside the hydraulic power module comprised of hydraulic pump and electrical motor for EHA was applied. This is for the purpose of developing the internal rotary group of hydraulic power module, which operates under the conditions of high rotation speed and hydraulic pressure. After formulating an appropriate thermal analysis model, the thermal analysis results with oil cooled or no oil cooled hydraulic control module were compared and reviewed, for the purpose of predicting the thermal characteristics of EHA.
공간분석기술을 활용한 사전환경성 검토 GIS 의사결정시스템 개발
김상석(Kim Sang Seok),장용구(Jang Yong Gu),강인준(Kang In Joon) 대한공간정보학회 2006 한국지형공간정보학회 학술대회 Vol.2006 No.5
현재 도로건설에 대한 환경영향평가제도는 대부분의 사업이 타당성조사와 병행하여 실시하지 않고 계획이 확정된 후 사업실시단계에서 주로 오염의 저감방안을 검토하고 있어 입지의 타당성 등 근본적인 친환경적인 개발의 유도에 한계가 있어왔고, 사회문제로 대두되고 있어 개발사업에 대한 사전환경성검토의 필요성이 더욱 증대되었다. 그러나, 사전환경성검토에 대한 항목이 정성적인 분석요소로 되어 있고, 개별적 검토에 의한 의사결정반영을 하고 있어 보다 합리적이고 정확한 분석결과에 의한 의사결정에 많은 어려움을 가지고 있다. 본 연구에서는 GIS 공간분석기술의 활용으로 보다 객관적이고 수치적인 데이터를 기반으로 한 사전환경성검토 의사결정시스템을 개발하였다. 또한 3D 시뮬레이션 기술을 활용한 도로 주행에 따른 가시권 및 경관성 분석효과를 제시하고, 최종의 최적노선 결정을 위한 통합 의사결정을 위한 경중률(Weight) 고려 및 UI를 고려한 활용방안을 제시하였다.