http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
결합재 및 혼화제를 사용한 조강 콘크리트의 거푸집 탈형 시기 분석
전명훈,방종대,이범식,박성식,박지영,조건희,Jun, Myoung-Hoon,Bang, Jong-Dae,Lee, Bum-Sik,Park, Seong-Sik,Park, Ji-Young,Cho, Gun-Hee 한국토지주택공사 토지주택연구원 2013 LHI journal of land, housing, and urban affairs Vol.4 No.2
건설공사에서 공기는 매우 중요한 요소로 건설사업비에 미치는 영향이 크다. 선진국들은 공기단축을 통해 건설사업비를 줄이고 있다. 국내 건설업체들도 공기단축을 위해 많은 노력을 기울이고 있지만, 공기단축 방법을 체계적으로 제시하지 못하고 있다. 일반적으로 골조공사의 공기는 거푸집의 존치기간에 영향을 받기 때문에 공기단축을 위해서는 거푸집의 존치기간을 단축해야 한다. 본 연구에서는 거푸집의 존치기간을 단축하기 위해 다양한 조건들의 조강콘크리트를 만들어서 압축강도 실험을 실시하였다. 이를 통해 거푸집의 탈형 시기를 제안하였다. 연구결과에 의하면 골조공사에 조강콘크리트를 사용하면 거푸집의 존치기간을 상당히 단축할 수 있는 것으로 나타났다. 본 연구결과들은 골조공사의 공기단축을 도모할 때 유용하게 활용될 수 있을 것이다. Construction duration in construction project is an important factor which affects project cost. Advanced countries have reduced project cost by time shortening. Even though domestic construction companies have tried to time shortening, they yet failed to find systematic method for time shortening. Typically, duration of structural framework is affected by stripping time of form. Therefore, it need to shorten the stripping time of form for time shortening of structural framework. In this study, specimens of high-early-strength concrete were manufactured with variety conditions and compressive strength was tested. This study proposed stripping time of side and slab forms using test results. The stripping time of form was shortened when using high-early-strength concrete in structural framework by the test results. The result of this study will be useful for time shortening of structural framework.
1SN-4 Ammonia electrolysis for clean hydrogen production
전명훈,정선기,이재영 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Ammonia has recently attracted a great deal of attention as an alternative energy source carrier because clean hydrogen can be produced via ammonia electrolysis without the emission of CO<sub>x</sub>. In this study, we prepared the Pt electrode by electrodepostion method, and the electrocatalytic oxidation behaviour of ammonia was studied in alkaline media. The electrode was characterized by qualitative and quantitative analysis. To discover the optimal structure and the effect of ammonia concentration, the bulk pH value, reaction temperature, and applied current of ammonia oxidation were investigated using potential sweep and galvanostatic methods. Finally, the preparation of PtED catalyst is used as anode electrode in an ammonia electrolysis system. Ammonia electrolysis was conducted using a zero-gap type cell, and it was shown that highly pure hydrogen was produced with a high energy efficiency over 80 %.
전명훈,홍수직,이재영 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
We investigate the oxidation of HCOO<sup>-</sup> on Pd/C in alkaline medium using H/D kinetic isotope effect studies and various electrochemical experiments. We first reveal that HCOO<sup>-</sup> is oxidized to CO<sub>2</sub> through a direct pathway, and the oxidation of Hads is the rate determining step (RDS) in the oxidation of HCOO<sup>-</sup>. We reveal that the slow oxidation kinetics of H<sub>ads</sub> serving as a site-blocking species inhibits the oxidation of HCOO-, and a more significant site-blocking effect is observed in the potential region for Hads. These observations are expected to provide clues to understanding the outstanding activity of Pd and rational approaches for the development of more active catalysts for the oxidation of HCOO<sup>-</sup> in alkaline medium.
A Novel SDN-based System for Provisioning of Smart Hybrid Media Services
전명훈,이병대 한국인터넷정보학회 2018 인터넷정보학회논문지 Vol.19 No.2
In recent years, technology is rapidly changing to support new service consumption and distribution models in multimedia service systems and hybrid delivery of media services is a key factor for enabling next generation multimedia services. This phenomenon can lead to rapidly increasing network traffic and ultimately has a direct and aggravating effect on the user’s quality of service (QOS). To address the issue, we propose a novel system architecture to provide smart hybrid media services efficiently. The architecture is designed to apply the software-defined networking (SDN) method, detect changes in traffic, and combine the data, including user data, service features, and computation node status, to provide a service schedule that is suitable for the current state. To this end, the proposed architecture is based on 2-level scheduling, where Level-1 scheduling is responsible for the best network path and a computation node for processing the user request, whereas Level-2 scheduling deals with individual service requests that arrived at the computation node. This paper describes the overall concept of the architecture, as well as the functions of each component. In addition, this paper describes potential scenarios that demonstrate how this architecture could provide services more efficiently than current media-service architectures.