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자율주행을 위한 적대적 공격 및 방어 딥러닝 모델 연구
김채현 ( Chae-hyeon Kim ),이진규 ( Jin-kyu Lee ),정은 ( Eun Jung ),정재호 ( Jae-ho Jung ),이현정 ( Hyun-jung Lee ),이규영 ( Gyu-young Lee ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2
자율주행의 시대가 도래함에 따라, 딥러닝 모델에 대한 적대적 공격 위험이 함께 증가하고 있다. 카메라 기반 자율주행차량이 공격받을 경우 보행자나 표지판 등에 대한 오분류로 인해 심각한 사고로 이어질 수 있어, 자율주행 시스템에서의 적대적 공격에 대한 방어 및 보안 기술 연구가 필수적이다. 이에 본 논문에서는 GTSRB 표지판 데이터를 이용하여 각종 공격 및 방어 기법을 개발하고 제안한다. 시간 및 정확도 측면에서 성능을 비교함으로써, 자율주행에 최적인 모델을 탐구하고 더 나아가 해당 모델들의 완전자율주행을 위한 발전 방향을 제안한다.
멀티 디스플레이 시스템을 이용한 농업용 사회기반시설물 진단법
김채현 ( Chae Hyeon Kim ),장예근 ( Yegeun Jang ),조준휘 ( Jun Hwi Cho ),지봉준 ( Bongjun Ji ),연재흠 ( Jaeheum Yeon ),송유섭 ( Yooseob Song ),강호영 ( Julian Kang ) 한국농공학회 2022 한국농공학회 학술대회초록집 Vol.2022 No.-
Since construction materials employed to construct the infrastructure are often exposed to water and moisture, the life of the infrastructure is rapidly reduced than originally expected due to their aging acceleration. In particular, the surfaces of agricultural infrastructure, which cannot avoid contact with water, deteriorate faster than other infrastructures because moss and moisture-saturated sediments make them quickly deteriorate. Therefore, the inspection of agricultural infrastructure should be frequently and periodically performed. However, the existing infrastructure damage inspection methods are labor-intensive and huge indirect cost loss inevitable. Therefore, using a digital twin technology and a multi-display system, a new method is introduced that can detect damages to the agricultural infrastructures indoors rather than in the field. The multi-display system was operated on the BIM CAVE application developed by Dr. Julian Kang of Texas A&M University after revising the existing BIM CAVE application source code to be compatible with Autodesk Navisworks 2022. For producing a 3D model of agricultural infrastructure, aerial photography was performed using a drone with an ultra-high-definition camera attached. Also, a digitally twined 3D model of the infrastructure that reflected its on-site condition was created using photogrammetry based on taken photos. A simple survey (Kangwon National University IRB 2022-01-005-001) was conducted to investigate whether or not the proposed method enhances the sense of presence or the perception when the user tries to look for the damages to the agricultural infrastructure in the virtual environment. As a result, the proposed method could be an advanced infrastructure health monitoring approach if some minor technical limitations of the commercial software are overcome.
송재민(Song, Jaemin),김채현(Kim, Chae Hyeon),박성희(Park, Sung Hee) 한국지역개발학회 2019 韓國地域開發學會誌 Vol.31 No.3
Sejong City was newly established as administrative capital of South Korea in 2012, to promote balanced territorial development within the country. Due to its unique characteristic as administrative capital city and considerable population size, the city is expected to have significant social and economic impacts on its surrounding areas at the regional level. The previous research on its impacts, however, has focused mainly on population migration within the region, raising concerns on larger migration from surrounding areas into Sejong City, referring to so-called population black hole. Against this background, the study aims to assess the economic impacts of Sejong city on the surrounding area. We compared the total number of employees before and after the establishment of Sejong City using a shift-share analysis and a difference-in-difference model. The result from the difference-in-difference model does not confirm that the negative impact of economic growth on the surrounding area is statistically significant, however the local comparative advantage of the surrounding areas has certainly decreased since the establishment of Sejong City based on our analysis using the shift-share analysis. The results from the study raise a need for continued monitoring on the economic impact of Sejong City on the neighboring cities to minimize potential negative impact but to maximize synergies among cities in the region.
장예근 ( Yegeun Jang ),김채현 ( Chae Hyeon Kim ),조준휘 ( Jun Hwi Cho ),정회준 ( Hoe Jun Jung ),지봉준 ( Bongjun Ji ),연재흠 ( Jaeheum Yeon ),임경재 ( Kyoung Jae Lim ) 한국농공학회 2022 한국농공학회 학술대회초록집 Vol.2022 No.-
The concepts and technologies of the digital twin are getting introduced to the agricultural engineering field to produce a virtual representation of agricultural infrastructure for real-time communication between the infrastructure on-site and its 3D model that is mimically reproduced in the virtual environment. At the 2021 Korea Society of Agricultural Engineers annual conference, This research team introduced how building information model can be displayed on the GIS-based digital twin platform. Based on the result this research team achieved, this study introduces how a digital map can be visualized on top of the BIM-GIS-based digital twin system. To achieve the research objective of this study, the source code of the digital twin platform had to be revised to load a geo JSON data source. In detail, a terrain JSON link associated with a digital map that we want to visualize on top of the GIS-BIM digital twin platform should be inserted into the file path. After that, the function of ‘clamp to ground’ should be revised as “true” to visualize the digital map on top of the existing digital twin system. After revising the existing source code, the digital map was successfully located where the user wants to put it. Therefore, since this study successfully demonstrated how to visualize not only building information model but also a digital map on the 3D GIS-based digital twin platform, the primary purpose of the digital twin could be taken one step closer to its practicality. This study is expected to be connected with the next research associated with the GIS-based digital twin platform in the agricultural engineering field.