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The ternary-double comb copolymer electrolyte for using flexible electric double layer capacitor
문주용,송은호,임정민,박정태 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The aqueous electrolytes are mainly used as electrolytes for supercapacitors, but there are disadvantages such as limited range of potential windows and electrolyte leakage problem. Therefore, many researchers are being held to develop electrolytes using polymers using nonaqueous electrolytes. The PVDC-g-(PMMA-g-POEM) was synthesized by ATRP and was used for supercapacitor polymer electrolyte with bis(trifluoromethane) sulfonamide lithium (LiTFSI) salt for enhancing ionic conductivity. PVDC-g-PMMA is the hydrophobic backbone which gives mechanical property that decreases crystallinity with grafting PMMA to PVDC and POEM possesses the hydrophilic side chain, making electron pathway which raises the electron transport properties. The coin cell structure with two stainless steel was used to measure ionic conductivity. Furthermore, solid-state flexible devices using carbon-based electrode are fabricated and assembled symmetrically using as-synthesized polymers as electrolyte.
초고층 건축공사의 리프트 수직 환승운영 최적화 방안 연구
문주용,박문서,이현수,정민혁,Moon, Jooyong,Park, Moonseo,Lee, Hyunsoo,Jung, Minhyuk 한국건설관리학회 2014 한국건설관리학회 논문집 Vol.15 No.6
Recently, the number of super high-rise building projects have been increased after recovering from international financial crisis. In super high-rise building project, vertical lifting is critical to overall project productivity, due to its limited lifting equipments. Also for projects which buildings' height are higher than 400m, transfer operation in lifting is inevitable because of lifts' maximum lifting height. In transfer operation, setting a transfer floor is essential for saving lifting time of resources. In this research, using discrete event simulation modeling with AnyLogic 7.0 software and metaheuristic optimization with OptQuest software, the method of optimizing a transfer floor for workers during the morning peak time is proposed. Comparing to the result of the case which transfer floor is designated to the middle floor, setting optimized transfer floor significantly decrease the total lifting time of workers. By using proposed simulation and optimization tool, saving budget and time through increasing available working hour is expected. 최근 세계 경제가 금융위기로부터 회복되기 시작하면서 전 세계적으로 초고층 건축공사 프로젝트가 증가하는 추세에 있다. 수직 리프트 양중은 리프트 양중 장비 대수의 제약으로 인해 초고층 건축공사 프로젝트에 있어서 전체 프로젝트의 생산성 측면에서 매우 중요한 요소이다. 특히 건물 높이가 400m 이상 되는 초고층 건축공사에서는, 리프트의 최대 운행높이로 인해 환승운영방식의 리프트 양중이 필수적이다. 환승운영방식 리프트 양중에서의 환승층 지정은 자원들의 양중 시간 단축에 많은 영향을 미친다. 본 연구에서는 AnyLogic 프로그램을 통한 이산사건 시뮬레이션 모델 구축 및 OptQuest 최적화 프로그램을 통한 메타휴리스틱 방식의 최적해 탐색으로 오전 출근시간대의 작업원 양중 시 환승층 최적화를 위한 방법을 제안하였다. 중간층을 환승층으로 지정했을 때와 비교한 결과, 최적 환승층을 지정했을 때 작업자들의 전체 양중시간이 상당히 단축되는 것으로 분석되었다. 본 연구에서 제안하는 도구를 사용 시 초고층 건축공사 프로젝트에서 작업원들의 가용 작업시간 증가를 통한 비용 절감 및 프로젝트 공기 단축이 가능할 것으로 예상된다.
문주용,강경리,임승만,최교훈,장홍제,박정태 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We suggest a simple process to fabricate a Pt nanoplate based counterelectrode for a solid-state dye-sensitized solar cell (ssDSSCs) to enhance cell performance. The different additional amounts of Pt precursor in Pt nanoplate solution could influence the morphologies of the counterelectrodes, which further influenced the catalytic activity of the counter electrodes and the photovoltaic performance of ssDSSCs. The structural, morphological, and electrochemical properties of Pt nanoplate based counterelectrode are investigated using SEM, TEM, XRD, EDX, UV-vis, EIS, and CV measurements. ssDSSCs fabricated with Pt nanoplate based counterelectrode had a long term stable efficiency of 5.3 %, which was much higher than that of ssDSSCs with a conventional countereletrode (4.5 %).