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Park, Sunjoong,Suh, Minwon,Kim, Kyungmok,Kim, Moohyun,Cho, Hyunjin,Shin, Hongjoo,Seo, Han Gil,Jung, WooChul,Jeon, Duk Young Elsevier 2019 Organic electronics Vol.75 No.-
<P><B>Abstract</B></P> <P>Solution-processable charge injection materials have gathered considerable attention in the field of organic optoelectronics owing to their ability to enhance device efficiency. Of those candidates, polyethylenimine (PEI) polymers have been widely explored, but their effect on the device physics in organic light-emitting diodes (OLEDs) are not completely elucidated yet. In this work, the impact of ZnO:PEI hybrid nanocomposite as an electron injection layer (EIL) of OLEDs on the device performance is investigated. Two different PEIs with the different spatial molecular configuration of the polymer, either linear or branched-type, are employed. Both PEI polymers have the ability to effectively reduce the work-function of ZnO. The ZnO:linear-PEI EIL shows higher device efficiency in comparison to the ZnO:branched-PEI EIL in the charge-balanced OLEDs, whereas the results are opposite in the charge-imbalanced device setup. This is mainly due to the different role required of EIL materials upon different device working mechanisms. This work shows a series of experimental results of the detailed device characteristics using ZnO:PEI hybrid EILs in order to provide a systematic understanding of the device physics by combining two key concepts together; (1) control of the molecular configuration, and (2) charge carrier dynamics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigate ‘device characteristics’ by using two different types of ZnO:PEI (branched PEI (BPEI) or linear PEI (LPEI)) as an electron injection layer (EIL). </LI> <LI> ZnO:LPEI offers better electron injection ability. In contrast, ZnO:BPEI performs better when playing both roles; electron injection and hole blocking. </LI> <LI> ZnO:LPEI shows higher device efficiencies compared to ZnO:BPEI in the charge-balanced OLEDs whereas it is opposite in the charge-imbalanced OLEDs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Impact of the spatial configuration of macromolecules of ZnO:polyethyleneimine (PEI) hybrid electron injection materials on OLED device performance is examined.</P> <P>[DISPLAY OMISSION]</P>
Effect of gap distance on vortex-induced vibration in two parallel cable-stayed bridges
Park, Jin,Kim, Sunjoong,Kim, Ho-Kyung Elsevier 2017 Journal of wind engineering and industrial aerodyn Vol.162 No.-
<P>This study was focused on the vortex-induced vibration (VIV) in parallel-disposed twin cable-stayed bridges. A series of wind tunnel tests were carried out to investigate the gap distance between two bridge decks and its effect on VIV. The gap distances examined covered a wide range of from one to twenty times the depth of the upstream deck. The amplitudes of VIVs in both decks were estimated using the variations in wind velocity. Particle image velocimetry (PIV) tests were performed to identify streamline changes between two decks for different gap distances. Also, the distribution of the swirling strength of the generated vortices was evaluated based on the velocity data obtained from PIV testing. According to the research results, gap distances of five to seven times the depth of the upstream deck critically affected the interactive VIV in two parallel cable-stayed bridges. The vulnerable gap distance was closely related to the moving distance of one vortex during a period of oscillation of the deck.</P>
박소연 ( Park¸ Soyeon ),김선중 ( Kim¸ Sunjoong ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
본 연구에서는 설명 가능한 AI를 활용하여 구조물의 가속도 응답을 통해 손상을 탐지에 사용되는 일차원 합성곱 신경망(One Dimensional Convolutional Neural Network: 1D-CNN) 모델의 판단 기준 조사방법론을 제안한다. 실제 트러스 교량에서 획득한 데이터를 추가적인 기법 적용 없이 학습용 데이터로 사용하였으며, 비손상과 손상 상태를 구별하는 모델을 센서의 수와 위치를 변화시켜 성능을 검증하였다. 또한, 설명 가능한 AI를 사용하여 블랙박스 형태로 존재하는 딥러닝(Deep Learning) 모델에 입력되는 데이터의 기여도를 비교 및 분석하였다.
스마트모바일 장치의 터치제스처를 이용한 획 중심 폰트 수정 인터페이스 시스템
이선중(SunJoong Lee),박일용(Ilyong Park),이승하(Seung-ha Lee) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1
스마트 모바일 장치의 성능의 향상과 그 사용이 대중화 되면서 사용자들이 시간, 장소, 도구의 제약에서 벗어나 많은 것을 할 수 있게 되었다. 특히 예전에는 도구에 숙달된 사용자만 즐길 수 있었던 영역의 일들을 일반사용자도 쉽게 경험해 볼 수 있도록 하는 스마트 모바일용 어플리케이션들이 많이 개발되고 있다. 폰트디자인 분야에서도 폰트제작을 위한 스마트모바일용 어플리케이션들이 많이 개발되었다. 하지만 기존 폰트 수정 어플리케이션들은 주로 폰트의 외형 점을 기반으로 수정하기 때문에 점들을 일일이 옮겨야 하는 번거로움이 있어 일반 사용자들이 쉽게 접근하기가 힘들다. 본 논문의 목적은 폰트 수정 인터페이스 방식을 개선하여 일반 사용자들도 쉽게 폰트 제작을 경험할 수 있는 방법을 제시하는 것이다. 이를 위해서 기존의 폰트 외형점 중심 수정 방식이 아닌 폰트의 획을 중심으로 멀티터치제스쳐와 드로잉터치방식을 통해 수정하는 방식의 인터페이스 시스템을 제안한다. 이를 위해 본 논문에서는 획 기반 폰트모델을 제안하고 인터페이스 시스템을 통해 스마트모바일 용 폰트 수정 어플리케이션으로 구현되어 동작을 확인하였다. Mobile device users are capable of doing many things without time, space and tools constraints. There has been many application programs for smart mobile devices that support user to be easily able to perform tasks that should be handled by experts in the past. In typography field, there are also a lot of font editing applications for smart mobile device. Because most of conventional font editing applications have been adopting the method of modifying fonts based on font’s boundary points, it’s a labor-intensive work. So it’s difficult for inexperienced users to edit fonts in such editor applications. The purpose of this paper is to suggest a method that improves the interface of the font editing system for non-expert users to intuitively experience the font edition and production. For this purpose, the paper proposes a stroke-font model and the interface system that adopts a method to edit fonts based on the font’s stroke by multi-touch and drawing-touch gestures, not based on font’s boundary points. The proposed interface system is verified its performance by implementing an application for smart mobile devices.
Kim, Sunjoong,Park, Jin,Kim, Ho-Kyung American Society of Civil Engineers 2017 Journal of bridge engineering Vol.22 No.3
<P>This study reports on the assessment of the vibrational serviceability performance of a parallel cable-stayed bridge, which was subjected to a vortex-induced vibration (VIV) in 2011, by identifying modal damping ratios from the operational monitoring data that were obtained. The natural excitation technique (NExT) combined with the eigen realization algorithm (ERA) was applied for the output-only modal analysis. Parameters regarding the NExT and ERA procedures were determined from a sensitivity analysis of identified damping ratios. Because a multiple tuned mass damper (MTMD) was installed at the center of the main span to mitigate VIV, the modal damping ratios before and after the installation of the MTMD were also compared. Several sets of operational monitoring data that had been collected under various windy conditions were used to develop a relationship between the identified damping ratios and the corresponding VIV level of the bridge. On the basis of these findings, the performance of the bridge was enhanced regarding vibrational serviceability. (C) 2016 American Society of Civil Engineers.</P>