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목표 형상을 추종하는 4D 프린팅 자동 설계에 관한 연구
함성일(Sungil Ham),이용구(Yong-Gu Lee) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.3
In general, the shape of a 3D printed object is not to be changed after the generation. Most changes, for example, contraction of a molten polymer after cooling is thought to be undesirable. 4D printing however tries to make benefit of a shape change after the part is generated. The shape change is required to be controllable in response to an external stimuli. These artifacts from 4D printing are called kinetic components which are defined as structures formed by combining inert materials and smart materials that change under certain stimuli. We propose a design software that can systematically calculate inert links with smart joints to follow the shape of the target design.
Using CAD Systems for LED Placement and to Generate Electric Circuits for Smart Glass
Sungil Ham(함성일) (사)한국CDE학회 2022 한국CDE학회 논문집 Vol.27 No.2
Industrial companies aim to improve their productivity by using the latest technologies such as Big Data, artificial intelligence, and IoT. However, small and medium-sized companies (SMEs) often lag behind with the introduction of new technologies and refrain from automating their production processes. In this regard, SMEs that produce smart glass, the production of which requires advanced technology, often continue to depend on manual production processes. We analyzed the existing production process to determine whether the integration of CAD technologies could be used to improve the productivity. This study was limited specifically to the development of algorithms for placing the LEDs in the glass in correspondence with the designed shape and to automatically generate a circuit for delivering current to the LEDs. The arrangement of the LEDs is designed to minimize the discrete Fréchet distance in consideration of the “local maximum point of curvature” and “kink point,” and the circuit is automatically organized by grouping a certain number of LEDs to supply similar current to the LEDs. Finally, the time required for LED placement and circuit preparation was reduced from 2 hours to 10 minutes.
건설 안전용 지오펜스 감시를 위한 이동형 CCTV 연구
강애띠 ( Kang Aetti ),김상우 ( Kim Sangwoo ),백은진 ( Baek Eunjin ),이지수 ( Lee Jisoo ),엄세민 ( Eom Semin ),함성일 ( Ham Sungil ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Frequent accidents occur when workers at construction sites leave the safety zone, and particularly in the past 5 years, 9 fatal accidents occurred at the Korea Railroad Corporation due to train accidents on other tracks during track work. With the Severe Accident Punishment Act taking effect in January 2022, it is a priority to secure a safe work environment for workers at industrial (construction) sites. Therefore, there is a need to manage workers’ departure from the safety zone (construction zone) and to facilitate communication within the construction zone. In this study, a mobile edge computing CCTV system is proposed that uses geofencing to determine whether workers are working in the danger zone, which can judge and respond in real-time to the ever-changing field environment. The proposed system is mobile and flexible, rather than server-based fixed CCTV. However, since it is designed mainly based on images, it has limitations in recognition rate depending on the environment such as distance, viewing angle, and illumination. As a way to compensate for this, it is required to develop more reliable equipment by combining technologies such as LiDAR and Radar.