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박상진,류지헌,오승모,Park, Sang-Jin,Ryu, Ji-Heon,Oh, Seung-Mo 한국전기화학회 2012 한국전기화학회지 Vol.15 No.1
표준 전해액에 2중량%의 VC(vinylene carbonate)와 FEC(fluoroethylene carbonate)를 각각 첨가한 전해액으로부터 흑연 음극 표면에 SEI(solid electrolyte interphase) 층을 형성시키고, SEI 특성에 따른 흑연 음극의 저온($-30^{\circ}C$) 충방전 특성을 조사하였다. 흑연의 충 방전 용량은 FEC를 첨가한 전해액, 표준 전해액, 그리고 VC를 첨가한 전해액의 순서로 감소하였고, 충 방시 발생하는 과전압은 반대경향을 보이며 증가하였다. 이는 첨가제의 종류에 따라 생성된 SEI 층의 저항과 전하전달저항에 차이가 있음을 설명하는데, 이를 SEI 층의 화학 조성과 두께를 비교하여 확인하였다. 표준 전해액으로부터 생성된 SEI 층은 C-O 성분을 포함하는 고분자 형태의 화합물과 리튬 염의 환원분해로 생성된 $Li_xPF_yO_z$ 등으로 구성되었다. VC를 포함한 전해액으로부터 생성된 SEI 층은 C-O 화합물 비율이 높고 조밀하여 리튬 염의 분해가 억제되어 얇은 피막이 생성됨에도 불구하고 가장 큰 저항 값을 보였다. 반면에 FEC로부터 생성된 SEI 층은 C-O 성분의 비율이 VC를 첨가한 전해액의 경우보다는 작으면서도 리튬 염의 분해가 크지 않아서, 리튬 이온의 이동이 가장 용이한 피막을 형성하고 있어 가장 낮은 피막저항 및 전하전달 저항을 나타내었다. 결론적으로 FEC를 첨가제로 사용한 경우 생성된 SEI 층의 저항이 가장 작아서 흑연 음극의 저온특성이 가장 우수하였다. SEI (solid electrolyte interphase) layers are generated on a graphite negative electrode from three different electrolytes and low-temperature ($-30^{\circ}C$) charge/discharge performance of the graphite electrode is examined. The electrolytes are prepared by adding 2 wt% of vinylene carbonate (VC) and fluoroethylene carbonate (FEC) into a standard electrolyte solution. The charge-discharge capacity of graphite electrode shows the following decreasing order; FEC-added one>standard>VC-added one. The polarization during a constant-current charging shows the reverse order. These observations illustrate that the SEI film resistance and charge transfer resistance differ according to the used additives. This feature has been confirmed by analyzing the chemical composition and thickness of three SEI layers. The SEI layer generated from the standard electrolyte is composed of polymeric carbon-oxygen species and the decomposition products ($Li_xPF_yO_z$) of lithium salt. The VC-derived surface film shows the largest resistance value even if the salt decomposition is not severe due to the presence of dense film comprising C-O species. The FEC-derived SEI layer shows the lowest resistance value as the C-O species are less populated and salt decomposition is not serious. In short, the FEC-added electrolyte generates the SEI layer of the smallest resistance to give the best low-temperature performance for the graphite negative electrode.
3D Scanning을 통한 건설현장 마감공사단계 XR 협업시스템 가이드라인에 관한 기초연구
박상진(Sang-Jin Park),황인구(In-Gu Hwang ),류리(Ri-Ryu),김용성(Yong-Seong Kim) (사)한국CDE학회 2020 한국CDE학회 논문집 Vol.25 No.3
A comprehensive construction company that receives orders for construction works is being constructed by subcontracting to a discontinued company when finishing work for civil engineering, beauty, and furniture. In addition, design details are often changed during the finishing construction phase due to reduced construction costs and design changes depending on the site situation before sub-contractor work. This leads to frequent meetings among finishing construction officials, wasting time and manpower to change drawings. As a way to prevent such problems in advance, architectural design is being carried out by applying BIM processes that virtually model facilities from planning, designing, engineering (structure, equipment, electricity, etc.) to construction, maintenance, and disposal of multi-dimensional virtual space, and the Public Procurement Service and the Ministry of Land, Infrastructure and Transport are recommending mandatory for activating BIM. The BIM has many studies in the construction industry that have been combined with the fourth industrial technology to improve such problems as the delay of the schedule of subsequent processes due to construction errors, and the increase in construction costs. I would like to propose a system using existing BIM and fourth industrial technology as a way to utilize it in the closing construction stage. In this study, the theory and prior study of 3D Scanning, the fourth industrial technology, and the applicable support system at the finishing stage were reviewed in this study, and based on this, the process of XR cooperation system for finishing construction at the construction stage was established. Based on trends in current use of BIM and 3D Scanning, 3D Scanning technology can be used to convert 3D information collected at the site into BIM data and extract comparative data in conjunction with existing BIM data to detect errors related to site dimensions and construction location of the process prior to the finishing work, as well as to change the design of walls, columns, floors, furniture, etc. In addition, after converting all data into XR data, construction simulation can be checked in conjunction with XR equipment. The 3D Scanning data converted to BIM data is a system that can modify and check actual construction information such as design change and changed materials, quantity, and dimensions in advance through the system, and we want to grasp the construction status stage information and suggest a scenario for smooth communication among finishing construction workers.
구리 프탈로시아닌으로 표면처리된 흑연 음극의 속도특성 및 저온성능 개선
정선형,박상진,류지헌,오승모,Jurng, Sunhyung,Park, Sangjin,Ryu, Ji Heon,Oh, Seung M. 한국전기화학회 2015 한국전기화학회지 Vol.18 No.3
흑연 분말을 프탈로시아닌 또는 구리 프탈로시아닌과 함께 비활성 분위기에서 각각 열처리하여 표면처리를 진행하였고, 이의 속도특성과 저온 작동특성을 조사하였다. 표면처리 후 흑연 분말의 표면에 비정질 탄소와 구리의 코팅 층이 균일하게 형성되었다. 표면처리를 통하여 흑연 전극의 속도특성이 개선되는 것을 확인하였는데, 특히 구리 프탈로시아닌으로 처리한 경우 속도특성의 향상이 두드러졌다. 흑연 전극의 저항을 교류 임피던스와 펄스 저항측정법을 활용하여 조사하였는데, 구리 프탈로시아닌으로 처리된 흑연 전극의 경우가 저항이 가장 작았다. 프탈로시아닌으로 부터 유도된 비정질 탄소 층이 리튬이온의 확산을 용이하게 하고, 구리 프탈로시아닌으로부터 유도된 금속상태의 구리는 전자 전도도를 증가시키기 때문에 저항을 감소시키는 것으로 판단된다. The rate capability and low-temperature characteristics of graphite electrode are investigated after surface treatment with copper phthalocyanine (CuPc) or phthalocyanine (Pc). Uniform coating layers comprising amorphous carbon or copper are generated after the treatment. The rate performance of graphite electrodes is enhanced by the surface treatment, which is more prominent with CuPc. The resistance of the graphite electrode estimated from electrochemical impedance spectroscopy and pulse resistance measurement is the smallest for the CuPc-treated graphite. It is likely that the amorphous carbon layer formed by the decomposition of Pc facilitates $Li^+$ diffusion and the metallic copper derived from CuPc improves the electrical conductivity of the graphite electrode.
지렁이 분변토로부터 황화수소 분해 균주의 분리 및 특성
이은영,조경숙,류희욱,박상진,배무 ( Eun Young Lee,Kyung Suk Cho,Hee Wook Ryu,Sang Jin Park,Moo Bae ) 한국환경생물학회 1997 환경생물 : 환경생물학회지 Vol.15 No.1
A new sulfur -oxidizing bacterium which was capable of degrading hydrogen sulfide was isolated from earthworm casts using deodorant materials. The cell of isolate CP-5 was short rod, gram negative and non-motile, the activities of cytochrome oxidase and catalase were positive. The isolate could autotrophically grow in the basal mineral medium supplemented the reduced sulfur compounds such as thiosulfate and elemental sulfur. This bacterium could oxidize thiosulfate and elemental sulfur to sulfate, and the metabolic intermediates were considered as tetrathionate and thiosulfate, respectively. The removal of hydrogen sulfide by the isolate CP-5 was confirmed, and the CP-5 was regarded as one of microorganisms responsible for degradation of hydrogen sulfide in earthworm casts. The isolate CP-5 can be applied to biodeodorization systems for the improvement of removal efficiency of hydrogen sulfide.