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안상덕 서울産業大學校 1994 논문집 Vol.40 No.1
This paper refers to the field application of Half Slab Method, which is installing thin PC-concrete slab plate upon both end of the beams without forms and then pouring the remaining concrete on that plate. The purpose of the study is to suggest the reduction of construction period and labor input according to the usage of Half Slab in place of the existing slab forms. It has investigated the properties of this method in comparison with the existing methods, and analyzed the on-site buildings which was being constructed by using the existing slab forms. Also, this paper compares the construction period and labor content of the Half Slab Method with those of the existing slab methods.
廢콘크리트 再活用 骨材에 포함된 不純物이 콘크리트의 物性에 미치는 影響
안상덕 서울産業大學校 1995 논문집 Vol.42 No.1
The study of recycled aggregate used waste concrete gained from the old concrete builing demolition has been done in laboratry. This study can contribute to the solution of two problems, the shortage of natural aggregate and the waste disposal, and deals with the estimation on effect of dusts and impurities comtaminated with recycled aggregate. In experiment in order to estimation the properties of recycled concrete used aggregates contaminated with dusts and impurities, for estimation of dust effect, aggregates of two kinds of both washed recycled coarse aggregates and non-washed ones were used, and the test for slump, air contents, bleeding and setting time etc, of fresh concrete, and the test for compressive strength, static modulus of elasticity and freezing and thawing of hardened concrete made of recycled coarse aggregates were planned. And for estimation of impurities effect, the compresive strength test and the dry-shringkage test were planned,. As the result of experiments, the properties of fresh or hardened concrete were related to using rate of recycled coarse aggregates alternated crushed coarse aggregates and mortar used the recycled aggregate was effected on the dry-shringkage were known.
硅酸質系 粉末型 塗布防水材의 品質管理 基準 設定에 관한 硏究
곽규성,김형무,오상근,안상덕 서울産業大學校 産業大學院 1999 大學院論文集 Vol.6 No.-
This paper deals with the standards for Quality Control of Cement Mixed Siliceous Powder Waterproofing Coatings. The Standard Items on the Performance of waterproofing coatings are four kinds of adhision strength, water absorption, hair cracking and compressive strength. We requested that the standard level value of adhision strehgth is 8.2∼10.2㎏f/㎠, that of water absorption amount is 2∼7g, that of hair cracking appearance is "Not appear hair crack", that of compressive strength is 102㎏f/㎠.
4호선 대우전동차 EC Box용 ESBA PCB의 고장분석에 관한 연구
안상덕(Sang-Duk An),최원석(Won-Suk Choi),이길형(Gil-Hyeong Lee),지유선(Yu-son Ji),김우교(Woo-Kyo Kim),김경섭(Kyung-Seob Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
서울메트로 4호선에서 사용되는 전자제어용 ESBA PCB는 전자제어(EC) Box 내에 탑재되어 ESL 및 INTO PCB와 상호작용를 통하여 VVVF 자기진단시험을 수행함과 동시에 전동차 제어회로를 구성하는 전자접점(PE)에 정전압제어에 의한 15V를 출력하여 주는 PCB로서 그 기능상으로 주요한 임무를 수행하고 있다. 그런데 ESBA PCB를 구성하는 콘덴서 및 제너다이오드 (ZD)의 고장으로 그 기능을 유지하고 동작하는데 있어서 막대한 지장을 초래할 뿐만 아니라, 고속도차단기(HSCB)의 고장으로 연계되는 문제점이 있다. 따라서 본 연구는 관련고장에 관한 분석을 통하여 고장예방이라는 관점에서 해결책을 도모하고자 한다. The electronic control ESBA PCB is used in the Seoul Metro Line 4 and installed in the EC (Electronic control) Box and it is performed VVVF self-diagnostic test through interaction the ESL PCB and INTO PCB, at the same time it is performed major task functionality as a PCB which output 15V constant voltage control by control contact point (PE) make up the train control circuit. However, this is associated with the failure of HSCB problems result in a significant disruption in maintaining the function as well as the breakdown of the capacitor and the zener-diode constituting ESBA PCB. Therefore, this study is achieved a solution in terms of the prevention of failure by the failure analysis related.