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임현수 ( Lim¸ Hyunsu ),조규만 ( Cho¸ Kyuman ),김태훈 ( Kim¸ Taehoon ) 한국건축시공학회 2021 한국건축시공학회지 Vol.21 No.5
건축공사에서 먹매김 공정은 건물의 구성요소를 계획된 위치에 정확히 형성하기 위한 기준이 되므로 높은 정밀도가 요구 된다. 최근의 건축물 규모 증가 및 숙련공 부족 추세에서 먹매김 공사는 로봇 기반의 자동화 기술 도입을 통한 생산성 및 품질 향상 요구가 크게 나타나고 있으며, 특히 가장 선행되는 골조공사 먹매김 작업의 중요도 및 자동화 필요성은 더욱 크다고 할 수 있다. 이러한 배경에서 본 연구는 건축물 골조공사용 먹매김에 적합한 시공 자동화 시스템 개발 방향을 제시하고자 한다. 기존 유사 기술 고찰을 토대로 하여 5가지 구성기술과 17개의 세부 기술요소를 도출하였으며, 전문가 설문을 통한 중요도 평가를 수행하였다. 설문 결과, 열악한 주행 및 작업 환경에 대응하기 위한 주행부 및 마킹부 기술이 가장 중요한 구성기술로 파악되었으며, 이러한 환경에서 정밀도를 확보하기 위한 제어기술과 전반적인 프로세스의 자동화기술의 중요성이 높게 나타났다. 본 연구 결과는 향후 보다 실용적이고 효율적인 자동화 시스템 개발에 기여할 것이다. In building construction, the layout operation is performed to accurately construct the building components in their planned locations, and requires a high level of accuracy and precision. With increases in building size and a lack of skilled laborers, this work has seen an increasing demand for productivity and quality improvements through robot-based construction automation. In particular, the layout work for building structures has a higher need for automation. On this background, this study suggests a direction for the development of an automated layout system of building structures. 5 technical factors and 17 sub-factors were derived based on reviews of existing similar systems, and an evaluation of their importance was carried out through an expert survey. As a result, it was found that the most important factors were driving and marking systems for coping with poor driving and working conditions. In terms of sub-factors, control techniques to secure precision and technologies to automate the overall layout process showed high importance. These findings will contribute to the development of more practical and efficient automation systems.
Optical Effects of Graphene Electrodes on Organic Light-Emitting Diodes
Hyunsu Cho,Jin-Wook Shin,Nam Sung Cho,Jaehyun Moon,Jun-Han Han,Young-Duck Kwon,Seungmin Cho,Jeong-Ik Lee IEEE 2016 IEEE journal of selected topics in quantum electro Vol.22 No.1
<P>We performed optical simulations and experiments to investigate the internal optics of graphene anode organic light-emitting diodes (OLEDs). The efficiencies, emission distribution, and spectral characteristics of four-layered graphene anode OLEDs were extracted and compared to those of ITO anode OLEDs. Unlike the case of the ITO anode OLED, the efficiencies and emission distributions of graphene anode OLEDs showed a weak dependency on the thickness of the organic layers. Furthermore, marginal changes in the emission spectra were observed. These results were ascribed to the negligible presence of a microcavity effect in the graphene anode OLED.</P>
Cho, Hyunsu,Yoo, Seunghyup Optical Society of America 2012 Optics express Vol.20 No.2
<P>Circular polarizer (CP)-free, high-contrast inverted top-emitting organic light-emitting diodes (ITOLEDs) are demonstrated by using a semitransparent Ag electrode capped with a single dielectric layer as a top anode and Cs(2)CO(3) (1.5 nm)/Al (1.5 nm)/Cr (100nm) as a partially absorbing bottom cathode. Low luminous reflectance is achieved by combining the broadband absorption of Cr, the weak but inherent cavity structure, and the optimal thickness of the capping layer yielding a high transmittance of a top electrode. With the optimized organic capping layer, contrast-enhanced ITOLEDs exhibit a luminous reflectance as low as 3.6% with a large thickness margin. Their luminous efficiency is shown to be comparable to or even higher than that of CP-based conventional OLEDs.</P>
Cho, Hyunsu,Choi, Jung-Min,Yoo, Seunghyup Optical Society of America 2011 Optics express Vol.19 No.2
<P>Highly transparent organic light-emitting diodes (TrOLEDs) are demonstrated using damage-free top cathodes of Cs<sub>2</sub>CO<sub>3</sub>/ Ag capped with ZnS layers. The presence of ultrathin Cs<sub>2</sub>CO<sub>3</sub> layers not only improves the electron injection properties but also makes Ag thin films more continuous and uniform, resulting in ideal top electrodes with low sheet resistance and high transmittance. The combination of the uniform Ag morphology enabled by Cs<sub>2</sub>CO<sub>3</sub> and the optimized thickness of ZnS capping layers results in TrOLEDs that have a peak transmittance as large as 80% with a luminous transmittance of 76.4%. These TrOLEDs exhibit a low turn-on voltage of 2.6V due to injection improvement by the Cs<sub>2</sub>CO<sub>3</sub> layers.</P>
Cho, Hyunsu,Yun, Changhun,Yoo, Seunghyup The Optical Society 2010 Optics express Vol.18 No.4
<P>The optical properties of dielectric-metal-dielectric (DMD) transparent electrodes are investigated from the perspectives of organic light-emitting diodes (OLEDs). A joint experimental and theoretical study showed that the optical characteristics of OLEDs based on DMD electrodes can be widely tuned to fulfill the requirements of a target application through careful control of the microcavity effect, transmittance of DMD electrodes, and a correlation of these two factors with the emission spectra of the emitted materials. Upon variation of the DMD structure, near-Lambertian emission and a 100% improvement in the luminous efficiency are demonstrated, respectively. Optimization strategies are also discussed that are relevant to forward luminous efficiency, total optical power, and angular/ spectral characteristics.</P>
Flexible integrated OLED substrates prepared by printing and plating process
Cho, Doo-Hee,Kwon, O Eun,Park, Young-Sam,Yu, Byoung Gon,Lee, Jonghee,Moon, Jaehyun,Cho, Hyunsu,Lee, Hyunkoo,Cho, Nam Sung Elsevier 2017 ORGANIC ELECTRONICS Vol.50 No.-
<P><B>Abstract</B></P> <P>We developed a cost-effective process to fabricate a flexible integrated organic light-emitting diode (OLED) substrate using a screen printing, an electroless copper plating, and a delamination process. Photolithographic method and expensive material such as silver paste were not used. Green OLED devices with the flexible integrated substrates were successfully fabricated, and the electro-optical characteristics such as leakage current and external quantum efficiency of the flexible OLED devices were comparable to those of OLED devices with a glass substrate. The process of this study is suitable for the low cost production of flexible OLED lighting panels.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A cost-effective process to fabricate flexible integrated OLED substrates is proposed. </LI> <LI> A screen printing, a copper plating, and lamination/delamination process are used for the flexible integrated substrate. </LI> <LI> Performance of the OLED device with the flexible integrated substrate is comparable to that of a glass substrate. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hyunsu Cho,Chung Jin,유승협,김은혜 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.4
Polarizer-free, high-contrast-ratio organic light-emitting diodes (OLEDs) are demonstrated using a microcavity structurein conjunction with neutral-density (ND) attenuation filters. The reduction of the OLED efficiency associated with the NDfilters is compensated for by the enhancement of the microcavity resonance. Furthermore, the absorption of photons from acavity eases the requirement of the optical density (OD) of the ND filter. The reflectance of the proposed OLED devices usingthe ND filter with an OD of 0.4 is less than 20% throughout the visible-wavelength region, and their luminous reflectanceis as low as 10%. These devices exhibit current efficiency comparable to those of the non-cavity-based OLEDs without anyfilter or polarizer.