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Lee, Seungjin,Kim, Youngwoong,Wu, Ziang,Lee, Changyeon,Oh, Seung Jin,Luan, Nguyen Thanh,Lee, Junbok,Jeong, Dahyun,Zhang, Kai,Huang, Fei,Kim, Taek-Soo,Woo, Han Young,Kim, Bumjoon J. American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.48
<P>Aqueous-processed all-polymer solar cells (aq-APSCs) are reported for the first time by developing a series of water/ethanol-soluble naphthalenediimide (NDI)-based polymer acceptors [P(NDIDEG-T), P(NDITEG-T), and P(NDITEG-T2)]. Polymer acceptors are designed by using the backbones of NDI-bithiophene and NDI-thiophene in combination with nonionic hydrophilic oligoethylene glycol (OEG) side chains that facilitate processability in water/ethanol mixtures. All three polymers exhibit sufficient solubility (20-50 mg mL<SUP>-1</SUP>) in the aqueous medium. The P(NDIDEG-T) polymer with shorter OEG side chains is the most crystalline with the highest electron mobility, enabling the fabrication of efficient aq-APSCs with the maximum power conversion efficiency (PCE) of 2.15%. Furthermore, these aq-APSCs are fabricated under ambient atmosphere by taking advantage of the eco-friendly aqueous process and, importantly, the devices exhibit outstanding air-stability without any encapsulation, as evident by maintaining more than 90% of the initial PCE in the air after 4 days. According to a double cantilever beam test, the interfacial adhesion properties between the active layer and electron/hole transporting layers were remarkably improved by incorporating the hydrophilic OEG-attached photoactive layer, which hinders the delamination of the constituent layers and prevents the increase of series resistance, ultimately leading to enhanced durability under ambient conditions. The combination of increased device stability and minimal environmental impact of these aq-APSCs demonstrates them to be worthy candidates for continued development of scalable polymer solar cells.</P> [FIG OMISSION]</BR>
Comparison of minimum thickness provisions for concrete beams in building codes and standards
Lee, Young Hak,Kim, Min Sook,Lee, Junbok,Scanlon, Andrew Canadian Science Publishing 2013 Canadian journal of civil engineering. Revue canad Vol.40 No.7
<P> Building codes and standards generally include provisions for deflection control of beams and slabs. These provisions usually include prescriptive methods for computing deflection as well as minimum thickness or span-depth limitations. In this paper, results of a study comparing minimum thickness provisions in several codes and standards including the Canadian (CSA A23.3) and American (ACI 318) provisions are presented. These results are in turn compared with results obtained based on a minimum thickness equation proposed by the authors. The results show that the CSA and ACI provisions have limited application and the proposed equation is recommended for adoption. </P>
Construction Automation and Robotics: Innovative Challenges and Opportunities
Junbok Lee Council on Tall Building and Urban Habitat Korea 2023 International journal of high-rise buildings Vol.12 No.4
With the advent of the recent Fourth Industrial Revolution, efforts are vigorously underway to comprehend the new paradigm of Construction 4.0, following in the footsteps of Industry 4.0, and to establish novel production systems. The necessity and significance of technological advancements in the field of construction automation and robotics, a pivotal component for Construction 4.0, are being emphasized. This paper aims to discuss the concept of construction automation and robotics, encompassing its past, present, and future prospects. Particularly, it reviews the six relevant papers featured in the June 2022 special issue of IJHRB, along with discussions on the integration of cutting-edge ICT technologies and R&D in the realm of automation and robotics. With the progression of ICT technology, the domain of construction automation and robotics is anticipated to play a substantial role in the realization of Construction 4.0 and smart construction through more dynamic convergence in technological development.
건축견적 교육을 위한 BIM기반 물량산출 멀티미디어 컨텐츠 개발
이효석(Lee, Hyo-Seok),최창훈(Choi, Chang-hoon),소지윤(Soh, Ji-yune),박영진(Park, Youngjin),한충희(Han, Choong-hee),이준복(Lee, Junbok) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.3
Construction estimate is a major factor in decision making for projects, and plays an important role in whole life of the project. Therefore, previous researches were conducted to analyze and survey quantity takeoff education at the university level. As a result, it was confirmed that due to limitations in quantity takeoff education materials which were made with texts and images, the non-professionals are lack of comprehensive understanding the process of the quantity surveying with the drawings. Thus, this study seeks to assist in effective quantity takeoff in building projects by supplementing the existing issues with quantity takeoff contents and developing a BIM-based quantity takeoff multimedia contents that use diverse media to increase the understanding on the subject for a non-professional.
이준복(Lee Junbok),김영석(Kim Young-Suk) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.5
Technology and engineering advancement is critical for the construction industry in order to stay competitive in the global market for the 21st century. It is obvious that construction automation and robotics is an emerging topic for safety and productivity improvements in the construction industry. The main objective of this paper is to suggest a technology roadmap model for planning and executing the construction automation research and development. The process of roadmapping is presented using a case project, which is development of pipe laying manipulator.